diff options
36 files changed, 921 insertions, 3820 deletions
diff --git a/Documentation/serial/hayes-esp.txt b/Documentation/serial/hayes-esp.txt deleted file mode 100644 index 09b5d585675..00000000000 --- a/Documentation/serial/hayes-esp.txt +++ /dev/null @@ -1,154 +0,0 @@ -HAYES ESP DRIVER VERSION 2.1 - -A big thanks to the people at Hayes, especially Alan Adamson. Their support -has enabled me to provide enhancements to the driver. - -Please report your experiences with this driver to me (arobinso@nyx.net). I -am looking for both positive and negative feedback. - -*** IMPORTANT CHANGES FOR 2.1 *** -Support for PIO mode. Five situations will cause PIO mode to be used: -1) A multiport card is detected. PIO mode will always be used. (8 port cards -do not support DMA). -2) The DMA channel is set to an invalid value (anything other than 1 or 3). -3) The DMA buffer/channel could not be allocated. The port will revert to PIO -mode until it is reopened. -4) Less than a specified number of bytes need to be transferred to/from the -FIFOs. PIO mode will be used for that transfer only. -5) A port needs to do a DMA transfer and another port is already using the -DMA channel. PIO mode will be used for that transfer only. - -Since the Hayes ESP seems to conflict with other cards (notably sound cards) -when using DMA, DMA is turned off by default. To use DMA, it must be turned -on explicitly, either with the "dma=" option described below or with -setserial. A multiport card can be forced into DMA mode by using setserial; -however, most multiport cards don't support DMA. - -The latest version of setserial allows the enhanced configuration of the ESP -card to be viewed and modified. -*** - -This package contains the files needed to compile a module to support the Hayes -ESP card. The drivers are basically a modified version of the serial drivers. - -Features: - -- Uses the enhanced mode of the ESP card, allowing a wider range of - interrupts and features than compatibility mode -- Uses DMA and 16 bit PIO mode to transfer data to and from the ESP's FIFOs, - reducing CPU load -- Supports primary and secondary ports - - -If the driver is compiled as a module, the IRQs to use can be specified by -using the irq= option. The format is: - -irq=[0x100],[0x140],[0x180],[0x200],[0x240],[0x280],[0x300],[0x380] - -The address in brackets is the base address of the card. The IRQ of -nonexistent cards can be set to 0. If an IRQ of a card that does exist is set -to 0, the driver will attempt to guess at the correct IRQ. For example, to set -the IRQ of the card at address 0x300 to 12, the insmod command would be: - -insmod esp irq=0,0,0,0,0,0,12,0 - -The custom divisor can be set by using the divisor= option. The format is the -same as for the irq= option. Each divisor value is a series of hex digits, -with each digit representing the divisor to use for a corresponding port. The -divisor value is constructed RIGHT TO LEFT. Specifying a nonzero divisor value -will automatically set the spd_cust flag. To calculate the divisor to use for -a certain baud rate, divide the port's base baud (generally 921600) by the -desired rate. For example, to set the divisor of the primary port at 0x300 to -4 and the divisor of the secondary port at 0x308 to 8, the insmod command would -be: - -insmod esp divisor=0,0,0,0,0,0,0x84,0 - -The dma= option can be used to set the DMA channel. The channel can be either -1 or 3. Specifying any other value will force the driver to use PIO mode. -For example, to set the DMA channel to 3, the insmod command would be: - -insmod esp dma=3 - -The rx_trigger= and tx_trigger= options can be used to set the FIFO trigger -levels. They specify when the ESP card should send an interrupt. Larger -values will decrease the number of interrupts; however, a value too high may -result in data loss. Valid values are 1 through 1023, with 768 being the -default. For example, to set the receive trigger level to 512 bytes and the -transmit trigger level to 700 bytes, the insmod command would be: - -insmod esp rx_trigger=512 tx_trigger=700 - -The flow_off= and flow_on= options can be used to set the hardware flow off/ -flow on levels. The flow on level must be lower than the flow off level, and -the flow off level should be higher than rx_trigger. Valid values are 1 -through 1023, with 1016 being the default flow off level and 944 being the -default flow on level. For example, to set the flow off level to 1000 bytes -and the flow on level to 935 bytes, the insmod command would be: - -insmod esp flow_off=1000 flow_on=935 - -The rx_timeout= option can be used to set the receive timeout value. This -value indicates how long after receiving the last character that the ESP card -should wait before signalling an interrupt. Valid values are 0 though 255, -with 128 being the default. A value too high will increase latency, and a -value too low will cause unnecessary interrupts. For example, to set the -receive timeout to 255, the insmod command would be: - -insmod esp rx_timeout=255 - -The pio_threshold= option sets the threshold (in number of characters) for -using PIO mode instead of DMA mode. For example, if this value is 32, -transfers of 32 bytes or less will always use PIO mode. - -insmod esp pio_threshold=32 - -Multiple options can be listed on the insmod command line by separating each -option with a space. For example: - -insmod esp dma=3 trigger=512 - -The esp module can be automatically loaded when needed. To cause this to -happen, add the following lines to /etc/modprobe.conf (replacing the last line -with options for your configuration): - -alias char-major-57 esp -alias char-major-58 esp -options esp irq=0,0,0,0,0,0,3,0 divisor=0,0,0,0,0,0,0x4,0 - -You may also need to run 'depmod -a'. - -Devices must be created manually. To create the devices, note the output from -the module after it is inserted. The output will appear in the location where -kernel messages usually appear (usually /var/adm/messages). Create two devices -for each 'tty' mentioned, one with major of 57 and the other with major of 58. -The minor number should be the same as the tty number reported. The commands -would be (replace ? with the tty number): - -mknod /dev/ttyP? c 57 ? -mknod /dev/cup? c 58 ? - -For example, if the following line appears: - -Oct 24 18:17:23 techno kernel: ttyP8 at 0x0140 (irq = 3) is an ESP primary port - -...two devices should be created: - -mknod /dev/ttyP8 c 57 8 -mknod /dev/cup8 c 58 8 - -You may need to set the permissions on the devices: - -chmod 666 /dev/ttyP* -chmod 666 /dev/cup* - -The ESP module and the serial module should not conflict (they can be used at -the same time). After the ESP module has been loaded the ports on the ESP card -will no longer be accessible by the serial driver. - -If I/O errors are experienced when accessing the port, check for IRQ and DMA -conflicts ('cat /proc/interrupts' and 'cat /proc/dma' for a list of IRQs and -DMAs currently in use). - -Enjoy! -Andrew J. Robinson <arobinso@nyx.net> diff --git a/Documentation/serial/tty.txt b/Documentation/serial/tty.txt index 8e65c4498c5..5e5349a4fcd 100644 --- a/Documentation/serial/tty.txt +++ b/Documentation/serial/tty.txt @@ -42,7 +42,8 @@ TTY side interfaces: open() - Called when the line discipline is attached to the terminal. No other call into the line discipline for this tty will occur until it - completes successfully. Can sleep. + completes successfully. Returning an error will + prevent the ldisc from being attached. Can sleep. close() - This is called on a terminal when the line discipline is being unplugged. At the point of @@ -52,7 +53,7 @@ close() - This is called on a terminal when the line hangup() - Called when the tty line is hung up. The line discipline should cease I/O to the tty. No further calls into the ldisc code will occur. - Can sleep. + The return value is ignored. Can sleep. write() - A process is writing data through the line discipline. Multiple write calls are serialized @@ -83,6 +84,10 @@ ioctl() - Called when an ioctl is handed to the tty layer that might be for the ldisc. Multiple ioctl calls may occur in parallel. May sleep. +compat_ioctl() - Called when a 32 bit ioctl is handed to the tty layer + that might be for the ldisc. Multiple ioctl calls + may occur in parallel. May sleep. + Driver Side Interfaces: receive_buf() - Hand buffers of bytes from the driver to the ldisc diff --git a/arch/xtensa/platforms/iss/console.c b/arch/xtensa/platforms/iss/console.c index 4c559cf7da2..e60a1f57022 100644 --- a/arch/xtensa/platforms/iss/console.c +++ b/arch/xtensa/platforms/iss/console.c @@ -196,7 +196,7 @@ static const struct file_operations rs_proc_fops = { .release = single_release, }; -static struct tty_operations serial_ops = { +static const struct tty_operations serial_ops = { .open = rs_open, .close = rs_close, .write = rs_write, diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig index 6aad99ec4e0..6f31c947210 100644 --- a/drivers/char/Kconfig +++ b/drivers/char/Kconfig @@ -201,19 +201,6 @@ config DIGIEPCA To compile this driver as a module, choose M here: the module will be called epca. -config ESPSERIAL - tristate "Hayes ESP serial port support" - depends on SERIAL_NONSTANDARD && ISA && ISA_DMA_API && BROKEN - help - This is a driver which supports Hayes ESP serial ports. Both single - port cards and multiport cards are supported. Make sure to read - <file:Documentation/hayes-esp.txt>. - - To compile this driver as a module, choose M here: the - module will be called esp. - - If unsure, say N. - config MOXA_INTELLIO tristate "Moxa Intellio support" depends on SERIAL_NONSTANDARD && (ISA || EISA || PCI) diff --git a/drivers/char/Makefile b/drivers/char/Makefile index 19a79dd79ee..f957edf7e45 100644 --- a/drivers/char/Makefile +++ b/drivers/char/Makefile @@ -18,7 +18,6 @@ obj-$(CONFIG_CONSOLE_TRANSLATIONS) += consolemap.o consolemap_deftbl.o obj-$(CONFIG_HW_CONSOLE) += vt.o defkeymap.o obj-$(CONFIG_AUDIT) += tty_audit.o obj-$(CONFIG_MAGIC_SYSRQ) += sysrq.o -obj-$(CONFIG_ESPSERIAL) += esp.o obj-$(CONFIG_MVME147_SCC) += generic_serial.o vme_scc.o obj-$(CONFIG_MVME162_SCC) += generic_serial.o vme_scc.o obj-$(CONFIG_BVME6000_SCC) += generic_serial.o vme_scc.o diff --git a/drivers/char/bfin_jtag_comm.c b/drivers/char/bfin_jtag_comm.c index 1d7c34c73b2..2628c7415ea 100644 --- a/drivers/char/bfin_jtag_comm.c +++ b/drivers/char/bfin_jtag_comm.c @@ -226,7 +226,7 @@ bfin_jc_wait_until_sent(struct tty_struct *tty, int timeout) } } -static struct tty_operations bfin_jc_ops = { +static const struct tty_operations bfin_jc_ops = { .open = bfin_jc_open, .close = bfin_jc_close, .write = bfin_jc_write, diff --git a/drivers/char/epca.c b/drivers/char/epca.c index dde5134713e..17b044a71e0 100644 --- a/drivers/char/epca.c +++ b/drivers/char/epca.c @@ -935,7 +935,7 @@ static int info_open(struct tty_struct *tty, struct file *filp) return 0; } -static struct tty_operations info_ops = { +static const struct tty_operations info_ops = { .open = info_open, .ioctl = info_ioctl, }; diff --git a/drivers/char/esp.c b/drivers/char/esp.c deleted file mode 100644 index b19d43cd954..00000000000 --- a/drivers/char/esp.c +++ /dev/null @@ -1,2533 +0,0 @@ -/* - * esp.c - driver for Hayes ESP serial cards - * - * --- Notices from serial.c, upon which this driver is based --- - * - * Copyright (C) 1991, 1992 Linus Torvalds - * - * Extensively rewritten by Theodore Ts'o, 8/16/92 -- 9/14/92. Now - * much more extensible to support other serial cards based on the - * 16450/16550A UART's. Added support for the AST FourPort and the - * Accent Async board. - * - * set_serial_info fixed to set the flags, custom divisor, and uart - * type fields. Fix suggested by Michael K. Johnson 12/12/92. - * - * 11/95: TIOCMIWAIT, TIOCGICOUNT by Angelo Haritsis <ah@doc.ic.ac.uk> - * - * 03/96: Modularised by Angelo Haritsis <ah@doc.ic.ac.uk> - * - * rs_set_termios fixed to look also for changes of the input - * flags INPCK, BRKINT, PARMRK, IGNPAR and IGNBRK. - * Bernd Anhäupl 05/17/96. - * - * --- End of notices from serial.c --- - * - * Support for the ESP serial card by Andrew J. Robinson - * <arobinso@nyx.net> (Card detection routine taken from a patch - * by Dennis J. Boylan). Patches to allow use with 2.1.x contributed - * by Chris Faylor. - * - * Most recent changes: (Andrew J. Robinson) - * Support for PIO mode. This allows the driver to work properly with - * multiport cards. - * - * Arnaldo Carvalho de Melo <acme@conectiva.com.br> - - * several cleanups, use module_init/module_exit, etc - * - * This module exports the following rs232 io functions: - * - * int espserial_init(void); - */ - -#include <linux/module.h> -#include <linux/errno.h> -#include <linux/signal.h> -#include <linux/sched.h> -#include <linux/interrupt.h> -#include <linux/tty.h> -#include <linux/tty_flip.h> -#include <linux/serial.h> -#include <linux/serialP.h> -#include <linux/serial_reg.h> -#include <linux/major.h> -#include <linux/string.h> -#include <linux/fcntl.h> -#include <linux/ptrace.h> -#include <linux/ioport.h> -#include <linux/mm.h> -#include <linux/init.h> -#include <linux/delay.h> -#include <linux/bitops.h> - -#include <asm/system.h> -#include <linux/io.h> - -#include <asm/dma.h> -#include <linux/slab.h> -#include <linux/uaccess.h> - -#include <linux/hayesesp.h> - -#define NR_PORTS 64 /* maximum number of ports */ -#define NR_PRIMARY 8 /* maximum number of primary ports */ -#define REGION_SIZE 8 /* size of io region to request */ - -/* The following variables can be set by giving module options */ -static int irq[NR_PRIMARY]; /* IRQ for each base port */ -static unsigned int divisor[NR_PRIMARY]; /* custom divisor for each port */ -static unsigned int dma = ESP_DMA_CHANNEL; /* DMA channel */ -static unsigned int rx_trigger = ESP_RX_TRIGGER; -static unsigned int tx_trigger = ESP_TX_TRIGGER; -static unsigned int flow_off = ESP_FLOW_OFF; -static unsigned int flow_on = ESP_FLOW_ON; -static unsigned int rx_timeout = ESP_RX_TMOUT; -static unsigned int pio_threshold = ESP_PIO_THRESHOLD; - -MODULE_LICENSE("GPL"); - -module_param_array(irq, int, NULL, 0); -module_param_array(divisor, uint, NULL, 0); -module_param(dma, uint, 0); -module_param(rx_trigger, uint, 0); -module_param(tx_trigger, uint, 0); -module_param(flow_off, uint, 0); -module_param(flow_on, uint, 0); -module_param(rx_timeout, uint, 0); -module_param(pio_threshold, uint, 0); - -/* END */ - -static char *dma_buffer; -static int dma_bytes; -static struct esp_pio_buffer *free_pio_buf; - -#define DMA_BUFFER_SZ 1024 - -#define WAKEUP_CHARS 1024 - -static char serial_name[] __initdata = "ESP serial driver"; -static char serial_version[] __initdata = "2.2"; - -static struct tty_driver *esp_driver; - -/* - * Serial driver configuration section. Here are the various options: - * - * SERIAL_PARANOIA_CHECK - * Check the magic number for the esp_structure where - * ever possible. - */ - -#undef SERIAL_PARANOIA_CHECK -#define SERIAL_DO_RESTART - -#undef SERIAL_DEBUG_INTR -#undef SERIAL_DEBUG_OPEN -#undef SERIAL_DEBUG_FLOW - -#if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT) -#define DBG_CNT(s) printk(KERN_DEBUG "(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \ - tty->name, info->port.flags, \ - serial_driver.refcount, \ - info->port.count, tty->count, s) -#else -#define DBG_CNT(s) -#endif - -static struct esp_struct *ports; - -static void change_speed(struct esp_struct *info); -static void rs_wait_until_sent(struct tty_struct *, int); - -/* - * The ESP card has a clock rate of 14.7456 MHz (that is, 2**ESPC_SCALE - * times the normal 1.8432 Mhz clock of most serial boards). - */ -#define BASE_BAUD ((1843200 / 16) * (1 << ESPC_SCALE)) - -/* Standard COM flags (except for COM4, because of the 8514 problem) */ -#define STD_COM_FLAGS (ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST) - -static inline int serial_paranoia_check(struct esp_struct *info, - char *name, const char *routine) -{ -#ifdef SERIAL_PARANOIA_CHECK - static const char badmagic[] = KERN_WARNING - "Warning: bad magic number for serial struct (%s) in %s\n"; - static const char badinfo[] = KERN_WARNING - "Warning: null esp_struct for (%s) in %s\n"; - - if (!info) { - printk(badinfo, name, routine); - return 1; - } - if (info->magic != ESP_MAGIC) { - printk(badmagic, name, routine); - return 1; - } -#endif - return 0; -} - -static inline unsigned int serial_in(struct esp_struct *info, int offset) -{ - return inb(info->io_port + offset); -} - -static inline void serial_out(struct esp_struct *info, int offset, - unsigned char value) -{ - outb(value, info->io_port+offset); -} - -/* - * ------------------------------------------------------------ - * rs_stop() and rs_start() - * - * This routines are called before setting or resetting tty->stopped. - * They enable or disable transmitter interrupts, as necessary. - * ------------------------------------------------------------ - */ -static void rs_stop(struct tty_struct *tty) -{ - struct esp_struct *info = tty->driver_data; - unsigned long flags; - - if (serial_paranoia_check(info, tty->name, "rs_stop")) - return; - - spin_lock_irqsave(&info->lock, flags); - if (info->IER & UART_IER_THRI) { - info->IER &= ~UART_IER_THRI; - serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK); - serial_out(info, UART_ESI_CMD2, info->IER); - } - spin_unlock_irqrestore(&info->lock, flags); -} - -static void rs_start(struct tty_struct *tty) -{ - struct esp_struct *info = tty->driver_data; - unsigned long flags; - - if (serial_paranoia_check(info, tty->name, "rs_start")) - return; - - spin_lock_irqsave(&info->lock, flags); - if (info->xmit_cnt && info->xmit_buf && !(info->IER & UART_IER_THRI)) { - info->IER |= UART_IER_THRI; - serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK); - serial_out(info, UART_ESI_CMD2, info->IER); - } - spin_unlock_irqrestore(&info->lock, flags); -} - -/* - * ---------------------------------------------------------------------- - * - * Here starts the interrupt handling routines. All of the following - * subroutines are declared as inline and are folded into - * rs_interrupt(). They were separated out for readability's sake. - * - * Note: rs_interrupt() is a "fast" interrupt, which means that it - * runs with interrupts turned off. People who may want to modify - * rs_interrupt() should try to keep the interrupt handler as fast as - * possible. After you are done making modifications, it is not a bad - * idea to do: - * - * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c - * - * and look at the resulting assemble code in serial.s. - * - * - Ted Ts'o (tytso@mit.edu), 7-Mar-93 - * ----------------------------------------------------------------------- - */ - -static DEFINE_SPINLOCK(pio_lock); - -static inline struct esp_pio_buffer *get_pio_buffer(void) -{ - struct esp_pio_buffer *buf; - unsigned long flags; - - spin_lock_irqsave(&pio_lock, flags); - if (free_pio_buf) { - buf = free_pio_buf; - free_pio_buf = buf->next; - } else { - buf = kmalloc(sizeof(struct esp_pio_buffer), GFP_ATOMIC); - } - spin_unlock_irqrestore(&pio_lock, flags); - return buf; -} - -static inline void release_pio_buffer(struct esp_pio_buffer *buf) -{ - unsigned long flags; - spin_lock_irqsave(&pio_lock, flags); - buf->next = free_pio_buf; - free_pio_buf = buf; - spin_unlock_irqrestore(&pio_lock, flags); -} - -static inline void receive_chars_pio(struct esp_struct *info, int num_bytes) -{ - struct tty_struct *tty = info->port.tty; - int i; - struct esp_pio_buffer *pio_buf; - struct esp_pio_buffer *err_buf; - unsigned char status_mask; - - pio_buf = get_pio_buffer(); - - if (!pio_buf) - return; - - err_buf = get_pio_buffer(); - - if (!err_buf) { - release_pio_buffer(pio_buf); - return; - } - - status_mask = (info->read_status_mask >> 2) & 0x07; - - for (i = 0; i < num_bytes - 1; i += 2) { - *((unsigned short *)(pio_buf->data + i)) = - inw(info->io_port + UART_ESI_RX); - err_buf->data[i] = serial_in(info, UART_ESI_RWS); - err_buf->data[i + 1] = (err_buf->data[i] >> 3) & status_mask; - err_buf->data[i] &= status_mask; - } - - if (num_bytes & 0x0001) { - pio_buf->data[num_bytes - 1] = serial_in(info, UART_ESI_RX); - err_buf->data[num_bytes - 1] = - (serial_in(info, UART_ESI_RWS) >> 3) & status_mask; - } - - /* make sure everything is still ok since interrupts were enabled */ - tty = info->port.tty; - - if (!tty) { - release_pio_buffer(pio_buf); - release_pio_buffer(err_buf); - info->stat_flags &= ~ESP_STAT_RX_TIMEOUT; - return; - } - - status_mask = (info->ignore_status_mask >> 2) & 0x07; - - for (i = 0; i < num_bytes; i++) { - if (!(err_buf->data[i] & status_mask)) { - int flag = 0; - - if (err_buf->data[i] & 0x04) { - flag = TTY_BREAK; - if (info->port.flags & ASYNC_SAK) - do_SAK(tty); - } else if (err_buf->data[i] & 0x02) - flag = TTY_FRAME; - else if (err_buf->data[i] & 0x01) - flag = TTY_PARITY; - tty_insert_flip_char(tty, pio_buf->data[i], flag); - } - } - - tty_schedule_flip(tty); - - info->stat_flags &= ~ESP_STAT_RX_TIMEOUT; - release_pio_buffer(pio_buf); - release_pio_buffer(err_buf); -} - -static void program_isa_dma(int dma, int dir, unsigned long addr, int len) -{ - unsigned long flags; - - flags = claim_dma_lock(); - disable_dma(dma); - clear_dma_ff(dma); - set_dma_mode(dma, dir); - set_dma_addr(dma, addr); - set_dma_count(dma, len); - enable_dma(dma); - release_dma_lock(flags); -} - -static void receive_chars_dma(struct esp_struct *info, int num_bytes) -{ - info->stat_flags &= ~ESP_STAT_RX_TIMEOUT; - dma_bytes = num_bytes; - info->stat_flags |= ESP_STAT_DMA_RX; - - program_isa_dma(dma, DMA_MODE_READ, isa_virt_to_bus(dma_buffer), - dma_bytes); - serial_out(info, UART_ESI_CMD1, ESI_START_DMA_RX); -} - -static inline void receive_chars_dma_done(struct esp_struct *info, - int status) -{ - struct tty_struct *tty = info->port.tty; - int num_bytes; - unsigned long flags; - - flags = claim_dma_lock(); - disable_dma(dma); - clear_dma_ff(dma); - - info->stat_flags &= ~ESP_STAT_DMA_RX; - num_bytes = dma_bytes - get_dma_residue(dma); - release_dma_lock(flags); - - info->icount.rx += num_bytes; - - if (num_bytes > 0) { - tty_insert_flip_string(tty, dma_buffer, num_bytes - 1); - - status &= (0x1c & info->read_status_mask); - - /* Is the status significant or do we throw the last byte ? */ - if (!(status & info->ignore_status_mask)) { - int statflag = 0; - - if (status & 0x10) { - statflag = TTY_BREAK; - (info->icount.brk)++; - if (info->port.flags & ASYNC_SAK) - do_SAK(tty); - } else if (status & 0x08) { - statflag = TTY_FRAME; - info->icount.frame++; - } else if (status & 0x04) { - statflag = TTY_PARITY; - info->icount.parity++; - } - tty_insert_flip_char(tty, dma_buffer[num_bytes - 1], - statflag); - } - tty_schedule_flip(tty); - } - - if (dma_bytes != num_bytes) { - num_bytes = dma_bytes - num_bytes; - dma_bytes = 0; - receive_chars_dma(info, num_bytes); - } else - dma_bytes = 0; -} - -/* Caller must hold info->lock */ - -static inline void transmit_chars_pio(struct esp_struct *info, - int space_avail) -{ - int i; - struct esp_pio_buffer *pio_buf; - - pio_buf = get_pio_buffer(); - - if (!pio_buf) - return; - - while (space_avail && info->xmit_cnt) { - if (info->xmit_tail + space_avail <= ESP_XMIT_SIZE) { - memcpy(pio_buf->data, - &(info->xmit_buf[info->xmit_tail]), - space_avail); - } else { - i = ESP_XMIT_SIZE - info->xmit_tail; - memcpy(pio_buf->data, - &(info->xmit_buf[info->xmit_tail]), i); - memcpy(&(pio_buf->data[i]), info->xmit_buf, - space_avail - i); - } - - info->xmit_cnt -= space_avail; - info->xmit_tail = (info->xmit_tail + space_avail) & - (ESP_XMIT_SIZE - 1); - - for (i = 0; i < space_avail - 1; i += 2) { - outw(*((unsigned short *)(pio_buf->data + i)), - info->io_port + UART_ESI_TX); - } - - if (space_avail & 0x0001) - serial_out(info, UART_ESI_TX, - pio_buf->data[space_avail - 1]); - - if (info->xmit_cnt) { - serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND); - serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL); - space_avail = serial_in(info, UART_ESI_STAT1) << 8; - space_avail |= serial_in(info, UART_ESI_STAT2); - - if (space_avail > info->xmit_cnt) - space_avail = info->xmit_cnt; - } - } - - if (info->xmit_cnt < WAKEUP_CHARS) { - if (info->port.tty) - tty_wakeup(info->port.tty); - -#ifdef SERIAL_DEBUG_INTR - printk("THRE..."); -#endif - - if (info->xmit_cnt <= 0) { - info->IER &= ~UART_IER_THRI; - serial_out(info, UART_ESI_CMD1, - ESI_SET_SRV_MASK); - serial_out(info, UART_ESI_CMD2, info->IER); - } - } - - release_pio_buffer(pio_buf); -} - -/* Caller must hold info->lock */ -static inline void transmit_chars_dma(struct esp_struct *info, int num_bytes) -{ - dma_bytes = num_bytes; - - if (info->xmit_tail + dma_bytes <= ESP_XMIT_SIZE) { - memcpy(dma_buffer, &(info->xmit_buf[info->xmit_tail]), - dma_bytes); - } else { - int i = ESP_XMIT_SIZE - info->xmit_tail; - memcpy(dma_buffer, &(info->xmit_buf[info->xmit_tail]), - i); - memcpy(&(dma_buffer[i]), info->xmit_buf, dma_bytes - i); - } - - info->xmit_cnt -= dma_bytes; - info->xmit_tail = (info->xmit_tail + dma_bytes) & (ESP_XMIT_SIZE - 1); - - if (info->xmit_cnt < WAKEUP_CHARS) { - if (info->port.tty) - tty_wakeup(info->port.tty); - -#ifdef SERIAL_DEBUG_INTR - printk("THRE..."); -#endif - - if (info->xmit_cnt <= 0) { - info->IER &= ~UART_IER_THRI; - serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK); - serial_out(info, UART_ESI_CMD2, info->IER); - } - } - - info->stat_flags |= ESP_STAT_DMA_TX; - - program_isa_dma(dma, DMA_MODE_WRITE, isa_virt_to_bus(dma_buffer), - dma_bytes); - serial_out(info, UART_ESI_CMD1, ESI_START_DMA_TX); -} - -static inline void transmit_chars_dma_done(struct esp_struct *info) -{ - int num_bytes; - unsigned long flags; - - flags = claim_dma_lock(); - disable_dma(dma); - clear_dma_ff(dma); - - num_bytes = dma_bytes - get_dma_residue(dma); - info->icount.tx += dma_bytes; - release_dma_lock(flags); - - if (dma_bytes != num_bytes) { - dma_bytes -= num_bytes; - memmove(dma_buffer, dma_buffer + num_bytes, dma_bytes); - - program_isa_dma(dma, DMA_MODE_WRITE, - isa_virt_to_bus(dma_buffer), dma_bytes); - - serial_out(info, UART_ESI_CMD1, ESI_START_DMA_TX); - } else { - dma_bytes = 0; - info->stat_flags &= ~ESP_STAT_DMA_TX; - } -} - -static void check_modem_status(struct esp_struct *info) -{ - int status; - - serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT); - status = serial_in(info, UART_ESI_STAT2); - - if (status & UART_MSR_ANY_DELTA) { - /* update input line counters */ - if (status & UART_MSR_TERI) - info->icount.rng++; - if (status & UART_MSR_DDSR) - info->icount.dsr++; - if (status & UART_MSR_DDCD) - info->icount.dcd++; - if (status & UART_MSR_DCTS) - info->icount.cts++; - wake_up_interruptible(&info->port.delta_msr_wait); - } - - if ((info->port.flags & ASYNC_CHECK_CD) && (status & UART_MSR_DDCD)) { -#if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR)) - printk("ttys%d CD now %s...", info->line, - (status & UART_MSR_DCD) ? "on" : "off"); -#endif - if (status & UART_MSR_DCD) - wake_up_interruptible(&info->port.open_wait); - else { -#ifdef SERIAL_DEBUG_OPEN - printk("scheduling hangup..."); -#endif - tty_hangup(info->port.tty); - } - } -} - -/* - * This is the serial driver's interrupt routine - */ -static irqreturn_t rs_interrupt_single(int irq, void *dev_id) -{ - struct esp_struct *info; - unsigned err_status; - unsigned int scratch; - -#ifdef SERIAL_DEBUG_INTR - printk("rs_interrupt_single(%d)...", irq); -#endif - info = (struct esp_struct *)dev_id; - err_status = 0; - scratch = serial_in(info, UART_ESI_SID); - - spin_lock(&info->lock); - - if (!info->port.tty) { - spin_unlock(&info->lock); - return IRQ_NONE; - } - - if (scratch & 0x04) { /* error */ - serial_out(info, UART_ESI_CMD1, ESI_GET_ERR_STAT); - err_status = serial_in(info, UART_ESI_STAT1); - serial_in(info, UART_ESI_STAT2); - - if (err_status & 0x01) - info->stat_flags |= ESP_STAT_RX_TIMEOUT; - - if (err_status & 0x20) /* UART status */ - check_modem_status(info); - - if (err_status & 0x80) /* Start break */ - wake_up_interruptible(&info->break_wait); - } - - if ((scratch & 0x88) || /* DMA completed or timed out */ - (err_status & 0x1c) /* receive error */) { - if (info->stat_flags & ESP_STAT_DMA_RX) - receive_chars_dma_done(info, err_status); - else if (info->stat_flags & ESP_STAT_DMA_TX) - transmit_chars_dma_done(info); - } - - if (!(info->stat_flags & (ESP_STAT_DMA_RX | ESP_STAT_DMA_TX)) && - ((scratch & 0x01) || (info->stat_flags & ESP_STAT_RX_TIMEOUT)) && - (info->IER & UART_IER_RDI)) { - int num_bytes; - - serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND); - serial_out(info, UART_ESI_CMD1, ESI_GET_RX_AVAIL); - num_bytes = serial_in(info, UART_ESI_STAT1) << 8; - num_bytes |= serial_in(info, UART_ESI_STAT2); - - num_bytes = tty_buffer_request_room(info->port.tty, num_bytes); - - if (num_bytes) { - if (dma_bytes || - (info->stat_flags & ESP_STAT_USE_PIO) || - (num_bytes <= info->config.pio_threshold)) - receive_chars_pio(info, num_bytes); - else - receive_chars_dma(info, num_bytes); - } - } - - if (!(info->stat_flags & (ESP_STAT_DMA_RX | ESP_STAT_DMA_TX)) && - (scratch & 0x02) && (info->IER & UART_IER_THRI)) { - if ((info->xmit_cnt <= 0) || info->port.tty->stopped) { - info->IER &= ~UART_IER_THRI; - serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK); - serial_out(info, UART_ESI_CMD2, info->IER); - } else { - int num_bytes; - - serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND); - serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL); - num_bytes = serial_in(info, UART_ESI_STAT1) << 8; - num_bytes |= serial_in(info, UART_ESI_STAT2); - - if (num_bytes > info->xmit_cnt) - num_bytes = info->xmit_cnt; - - if (num_bytes) { - if (dma_bytes || - (info->stat_flags & ESP_STAT_USE_PIO) || - (num_bytes <= info->config.pio_threshold)) - transmit_chars_pio(info, num_bytes); - else - transmit_chars_dma(info, num_bytes); - } - } - } - - info->last_active = jiffies; - -#ifdef SERIAL_DEBUG_INTR - printk("end.\n"); -#endif - spin_unlock(&info->lock); - return IRQ_HANDLED; -} - -/* - * ------------------------------------------------------------------- - * Here ends the serial interrupt routines. - * ------------------------------------------------------------------- - */ - -/* - * --------------------------------------------------------------- - * Low level utility subroutines for the serial driver: routines to - * figure out the appropriate timeout for an interrupt chain, routines - * to initialize and startup a serial port, and routines to shutdown a - * serial port. Useful stuff like that. - * - * Caller should hold lock - * --------------------------------------------------------------- - */ - -static void esp_basic_init(struct esp_struct *info) -{ - /* put ESPC in enhanced mode */ - serial_out(info, UART_ESI_CMD1, ESI_SET_MODE); - - if (info->stat_flags & ESP_STAT_NEVER_DMA) - serial_out(info, UART_ESI_CMD2, 0x01); - else - serial_out(info, UART_ESI_CMD2, 0x31); - - /* disable interrupts for now */ - serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK); - serial_out(info, UART_ESI_CMD2, 0x00); - - /* set interrupt and DMA channel */ - serial_out(info, UART_ESI_CMD1, ESI_SET_IRQ); - - if (info->stat_flags & ESP_STAT_NEVER_DMA) - serial_out(info, UART_ESI_CMD2, 0x01); - else - serial_out(info, UART_ESI_CMD2, (dma << 4) | 0x01); - - serial_out(info, UART_ESI_CMD1, ESI_SET_ENH_IRQ); - - if (info->line % 8) /* secondary port */ - serial_out(info, UART_ESI_CMD2, 0x0d); /* shared */ - else if (info->irq == 9) - serial_out(info, UART_ESI_CMD2, 0x02); - else - serial_out(info, UART_ESI_CMD2, info->irq); - - /* set error status mask (check this) */ - serial_out(info, UART_ESI_CMD1, ESI_SET_ERR_MASK); - - if (info->stat_flags & ESP_STAT_NEVER_DMA) - serial_out(info, UART_ESI_CMD2, 0xa1); - else - serial_out(info, UART_ESI_CMD2, 0xbd); - - serial_out(info, UART_ESI_CMD2, 0x00); - - /* set DMA timeout */ - serial_out(info, UART_ESI_CMD1, ESI_SET_DMA_TMOUT); - serial_out(info, UART_ESI_CMD2, 0xff); - - /* set FIFO trigger levels */ - serial_out(info, UART_ESI_CMD1, ESI_SET_TRIGGER); - serial_out(info, UART_ESI_CMD2, info->config.rx_trigger >> 8); - serial_out(info, UART_ESI_CMD2, info->config.rx_trigger); - serial_out(info, UART_ESI_CMD2, info->config.tx_trigger >> 8); - serial_out(info, UART_ESI_CMD2, info->config.tx_trigger); - - /* Set clock scaling and wait states */ - serial_out(info, UART_ESI_CMD1, ESI_SET_PRESCALAR); - serial_out(info, UART_ESI_CMD2, 0x04 | ESPC_SCALE); - - /* set reinterrupt pacing */ - serial_out(info, UART_ESI_CMD1, ESI_SET_REINTR); - serial_out(info, UART_ESI_CMD2, 0xff); -} - -static int startup(struct esp_struct *info) -{ - unsigned long flags; - int retval = 0; - unsigned int num_chars; - - spin_lock_irqsave(&info->lock, flags); - - if (info->port.flags & ASYNC_INITIALIZED) - goto out; - - if (!info->xmit_buf) { - info->xmit_buf = (unsigned char *)get_zeroed_page(GFP_ATOMIC); - retval = -ENOMEM; - if (!info->xmit_buf) - goto out; - } - -#ifdef SERIAL_DEBUG_OPEN - printk(KERN_DEBUG "starting up ttys%d (irq %d)...", - info->line, info->irq); -#endif - - /* Flush the RX buffer. Using the ESI flush command may cause */ - /* wild interrupts, so read all the data instead. */ - - serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND); - serial_out(info, UART_ESI_CMD1, ESI_GET_RX_AVAIL); - num_chars = serial_in(info, UART_ESI_STAT1) << 8; - num_chars |= serial_in(info, UART_ESI_STAT2); - - while (num_chars > 1) { - inw(info->io_port + UART_ESI_RX); - num_chars -= 2; - } - - if (num_chars) - serial_in(info, UART_ESI_RX); - - /* set receive character timeout */ - serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT); - serial_out(info, UART_ESI_CMD2, info->config.rx_timeout); - - /* clear all flags except the "never DMA" flag */ - info->stat_flags &= ESP_STAT_NEVER_DMA; - - if (info->stat_flags & ESP_STAT_NEVER_DMA) - info->stat_flags |= ESP_STAT_USE_PIO; - - spin_unlock_irqrestore(&info->lock, flags); - - /* - * Allocate the IRQ - */ - - retval = request_irq(info->irq, rs_interrupt_single, IRQF_SHARED, - "esp serial", info); - - if (retval) { - if (capable(CAP_SYS_ADMIN)) { - if (info->port.tty) - set_bit(TTY_IO_ERROR, - &info->port.tty->flags); - retval = 0; - } - goto out_unlocked; - } - - if (!(info->stat_flags & ESP_STAT_USE_PIO) && !dma_buffer) { - dma_buffer = (char *)__get_dma_pages( - GFP_KERNEL, get_order(DMA_BUFFER_SZ)); - - /* use PIO mode if DMA buf/chan cannot be allocated */ - if (!dma_buffer) - info->stat_flags |= ESP_STAT_USE_PIO; - else if (request_dma(dma, "esp serial")) { - free_pages((unsigned long)dma_buffer, - get_order(DMA_BUFFER_SZ)); - dma_buffer = NULL; - info->stat_flags |= ESP_STAT_USE_PIO; - } - - } - - info->MCR = UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2; - - spin_lock_irqsave(&info->lock, flags); - serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART); - serial_out(info, UART_ESI_CMD2, UART_MCR); - serial_out(info, UART_ESI_CMD2, info->MCR); - - /* - * Finally, enable interrupts - */ - /* info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI; */ - info->IER = UART_IER_RLSI | UART_IER_RDI | UART_IER_DMA_TMOUT | - UART_IER_DMA_TC; - serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK); - serial_out(info, UART_ESI_CMD2, info->IER); - - if (info->port.tty) - clear_bit(TTY_IO_ERROR, &info->port.tty->flags); - info->xmit_cnt = info->xmit_head = info->xmit_tail = 0; - spin_unlock_irqrestore(&info->lock, flags); - - /* - * Set up the tty->alt_speed kludge - */ - if (info->port.tty) { - if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI) - info->port.tty->alt_speed = 57600; - if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI) - info->port.tty->alt_speed = 115200; - if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI) - info->port.tty->alt_speed = 230400; - if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP) - info->port.tty->alt_speed = 460800; - } - - /* - * set the speed of the serial port - */ - change_speed(info); - info->port.flags |= ASYNC_INITIALIZED; - return 0; - -out: - spin_unlock_irqrestore(&info->lock, flags); -out_unlocked: - return retval; -} - -/* - * This routine will shutdown a serial port; interrupts are disabled, and - * DTR is dropped if the hangup on close termio flag is on. - */ -static void shutdown(struct esp_struct *info) -{ - unsigned long flags, f; - - if (!(info->port.flags & ASYNC_INITIALIZED)) - return; - -#ifdef SERIAL_DEBUG_OPEN - printk("Shutting down serial port %d (irq %d)....", info->line, - info->irq); -#endif - - spin_lock_irqsave(&info->lock, flags); - /* - * clear delta_msr_wait queue to avoid mem leaks: we may free the irq - * here so the queue might never be waken up - */ - wake_up_interruptible(&info->port.delta_msr_wait); - wake_up_interruptible(&info->break_wait); - - /* stop a DMA transfer on the port being closed */ - /* DMA lock is higher priority always */ - if (info->stat_flags & (ESP_STAT_DMA_RX | ESP_STAT_DMA_TX)) { - f = claim_dma_lock(); - disable_dma(dma); - clear_dma_ff(dma); - release_dma_lock(f); - - dma_bytes = 0; - } - - /* - * Free the IRQ - */ - free_irq(info->irq, info); - - if (dma_buffer) { - struct esp_struct *current_port = ports; - - while (current_port) { - if ((current_port != info) && - (current_port->port.flags & ASYNC_INITIALIZED)) - break; - - current_port = current_port->next_port; - } - - if (!current_port) { - free_dma(dma); - free_pages((unsigned long)dma_buffer, - get_order(DMA_BUFFER_SZ)); - dma_buffer = NULL; - } - } - - if (info->xmit_buf) { - free_page((unsigned long) info->xmit_buf); - info->xmit_buf = NULL; - } - - info->IER = 0; - serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK); - serial_out(info, UART_ESI_CMD2, 0x00); - - if (!info->port.tty || (info->port.tty->termios->c_cflag & HUPCL)) - info->MCR &= ~(UART_MCR_DTR|UART_MCR_RTS); - - info->MCR &= ~UART_MCR_OUT2; - serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART); - serial_out(info, UART_ESI_CMD2, UART_MCR); - serial_out(info, UART_ESI_CMD2, info->MCR); - - if (info->port.tty) - set_bit(TTY_IO_ERROR, &info->port.tty->flags); - - info->port.flags &= ~ASYNC_INITIALIZED; - spin_unlock_irqrestore(&info->lock, flags); -} - -/* - * This routine is called to set the UART divisor registers to match - * the specified baud rate for a serial port. - */ -static void change_speed(struct esp_struct *info) -{ - unsigned short port; - int quot = 0; - unsigned cflag, cval; - int baud, bits; - unsigned char flow1 = 0, flow2 = 0; - unsigned long flags; - - if (!info->port.tty || !info->port.tty->termios) - return; - cflag = info->port.tty->termios->c_cflag; - port = info->io_port; - - /* byte size and parity */ - switch (cflag & CSIZE) { - case CS5: cval = 0x00; bits = 7; break; - case CS6: cval = 0x01; bits = 8; break; - case CS7: cval = 0x02; bits = 9; break; - case CS8: cval = 0x03; bits = 10; break; - default: cval = 0x00; bits = 7; break; - } - if (cflag & CSTOPB) { - cval |= 0x04; - bits++; - } - if (cflag & PARENB) { - cval |= UART_LCR_PARITY; - bits++; - } - if (!(cflag & PARODD)) - cval |= UART_LCR_EPAR; -#ifdef CMSPAR - if (cflag & CMSPAR) - cval |= UART_LCR_SPAR; -#endif - baud = tty_get_baud_rate(info->port.tty); - if (baud == 38400 && - ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST)) - quot = info->custom_divisor; - else { - if (baud == 134) /* Special case since 134 is really 134.5 */ - quot = (2*BASE_BAUD / 269); - else if (baud) - quot = BASE_BAUD / baud; - } - /* If the quotient is ever zero, default to 9600 bps */ - if (!quot) - quot = BASE_BAUD / 9600; - - if (baud) { - /* Actual rate */ - baud = BASE_BAUD/quot; - tty_encode_baud_rate(info->port.tty, baud, baud); - } - info->timeout = ((1024 * HZ * bits * quot) / BASE_BAUD) + (HZ / 50); - - /* CTS flow control flag and modem status interrupts */ - /* info->IER &= ~UART_IER_MSI; */ - if (cflag & CRTSCTS) { - info->port.flags |= ASYNC_CTS_FLOW; - /* info->IER |= UART_IER_MSI; */ - flow1 = 0x04; - flow2 = 0x10; - } else - info->port.flags &= ~ASYNC_CTS_FLOW; - if (cflag & CLOCAL) - info->port.flags &= ~ASYNC_CHECK_CD; - else - info->port.flags |= ASYNC_CHECK_CD; - - /* - * Set up parity check flag - */ - info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR; - if (I_INPCK(info->port.tty)) - info->read_status_mask |= UART_LSR_FE | UART_LSR_PE; - if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty)) - info->read_status_mask |= UART_LSR_BI; - - info->ignore_status_mask = 0; -#if 0 - /* This should be safe, but for some broken bits of hardware... */ - if (I_IGNPAR(info->port.tty)) { - info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; - info->read_status_mask |= UART_LSR_PE | UART_LSR_FE; - } -#endif - if (I_IGNBRK(info->port.tty)) { - info->ignore_status_mask |= UART_LSR_BI; - info->read_status_mask |= UART_LSR_BI; - /* - * If we're ignore parity and break indicators, ignore - * overruns too. (For real raw support). - */ - if (I_IGNPAR(info->port.tty)) { - info->ignore_status_mask |= UART_LSR_OE | \ - UART_LSR_PE | UART_LSR_FE; - info->read_status_mask |= UART_LSR_OE | \ - UART_LSR_PE | UART_LSR_FE; - } - } - - if (I_IXOFF(info->port.tty)) - flow1 |= 0x81; - - spin_lock_irqsave(&info->lock, flags); - /* set baud */ - serial_out(info, UART_ESI_CMD1, ESI_SET_BAUD); - serial_out(info, UART_ESI_CMD2, quot >> 8); - serial_out(info, UART_ESI_CMD2, quot & 0xff); - - /* set data bits, parity, etc. */ - serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART); - serial_out(info, UART_ESI_CMD2, UART_LCR); - serial_out(info, UART_ESI_CMD2, cval); - - /* Enable flow control */ - serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_CNTL); - serial_out(info, UART_ESI_CMD2, flow1); - serial_out(info, UART_ESI_CMD2, flow2); - - /* set flow control characters (XON/XOFF only) */ - if (I_IXOFF(info->port.tty)) { - serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_CHARS); - serial_out(info, UART_ESI_CMD2, START_CHAR(info->port.tty)); - serial_out(info, UART_ESI_CMD2, STOP_CHAR(info->port.tty)); - serial_out(info, UART_ESI_CMD2, 0x10); - serial_out(info, UART_ESI_CMD2, 0x21); - switch (cflag & CSIZE) { - case CS5: - serial_out(info, UART_ESI_CMD2, 0x1f); - break; - case CS6: - serial_out(info, UART_ESI_CMD2, 0x3f); - break; - case CS7: - case CS8: - serial_out(info, UART_ESI_CMD2, 0x7f); - break; - default: - serial_out(info, UART_ESI_CMD2, 0xff); - break; - } - } - - /* Set high/low water */ - serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_LVL); - serial_out(info, UART_ESI_CMD2, info->config.flow_off >> 8); - serial_out(info, UART_ESI_CMD2, info->config.flow_off); - serial_out(info, UART_ESI_CMD2, info->config.flow_on >> 8); - serial_out(info, UART_ESI_CMD2, info->config.flow_on); - - spin_unlock_irqrestore(&info->lock, flags); -} - -static int rs_put_char(struct tty_struct *tty, unsigned char ch) -{ - struct esp_struct *info = tty->driver_data; - unsigned long flags; - int ret = 0; - - if (serial_paranoia_check(info, tty->name, "rs_put_char")) - return 0; - - if (!info->xmit_buf) - return 0; - - spin_lock_irqsave(&info->lock, flags); - if (info->xmit_cnt < ESP_XMIT_SIZE - 1) { - info->xmit_buf[info->xmit_head++] = ch; - info->xmit_head &= ESP_XMIT_SIZE-1; - info->xmit_cnt++; - ret = 1; - } - spin_unlock_irqrestore(&info->lock, flags); - return ret; -} - -static void rs_flush_chars(struct tty_struct *tty) -{ - struct esp_struct *info = tty->driver_data; - unsigned long flags; - - if (serial_paranoia_check(info, tty->name, "rs_flush_chars")) - return; - - spin_lock_irqsave(&info->lock, flags); - - if (info->xmit_cnt <= 0 || tty->stopped || !info->xmit_buf) - goto out; - - if (!(info->IER & UART_IER_THRI)) { - info->IER |= UART_IER_THRI; - serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK); - serial_out(info, UART_ESI_CMD2, info->IER); - } -out: - spin_unlock_irqrestore(&info->lock, flags); -} - -static int rs_write(struct tty_struct *tty, - const unsigned char *buf, int count) -{ - int c, t, ret = 0; - struct esp_struct *info = tty->driver_data; - unsigned long flags; - - if (serial_paranoia_check(info, tty->name, "rs_write")) - return 0; - - if (!info->xmit_buf) - return 0; - - while (1) { - /* Thanks to R. Wolff for suggesting how to do this with */ - /* interrupts enabled */ - - c = count; - t = ESP_XMIT_SIZE - info->xmit_cnt - 1; - - if (t < c) - c = t; - - t = ESP_XMIT_SIZE - info->xmit_head; - - if (t < c) - c = t; - - if (c <= 0) - break; - - memcpy(info->xmit_buf + info->xmit_head, buf, c); - - info->xmit_head = (info->xmit_head + c) & (ESP_XMIT_SIZE-1); - info->xmit_cnt += c; - buf += c; - count -= c; - ret += c; - } - - spin_lock_irqsave(&info->lock, flags); - - if (info->xmit_cnt && !tty->stopped && !(info->IER & UART_IER_THRI)) { - info->IER |= UART_IER_THRI; - serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK); - serial_out(info, UART_ESI_CMD2, info->IER); - } - - spin_unlock_irqrestore(&info->lock, flags); - return ret; -} - -static int rs_write_room(struct tty_struct *tty) -{ - struct esp_struct *info = tty->driver_data; - int ret; - unsigned long flags; - - if (serial_paranoia_check(info, tty->name, "rs_write_room")) - return 0; - - spin_lock_irqsave(&info->lock, flags); - - ret = ESP_XMIT_SIZE - info->xmit_cnt - 1; - if (ret < 0) - ret = 0; - spin_unlock_irqrestore(&info->lock, flags); - return ret; -} - -static int rs_chars_in_buffer(struct tty_struct *tty) -{ - struct esp_struct *info = tty->driver_data; - - if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer")) - return 0; - return info->xmit_cnt; -} - -static void rs_flush_buffer(struct tty_struct *tty) -{ - struct esp_struct *info = tty->driver_data; - unsigned long flags; - - if (serial_paranoia_check(info, tty->name, "rs_flush_buffer")) - return; - spin_lock_irqsave(&info->lock, flags); - info->xmit_cnt = info->xmit_head = info->xmit_tail = 0; - spin_unlock_irqrestore(&info->lock, flags); - tty_wakeup(tty); -} - -/* - * ------------------------------------------------------------ - * rs_throttle() - * - * This routine is called by the upper-layer tty layer to signal that - * incoming characters should be throttled. - * ------------------------------------------------------------ - */ -static void rs_throttle(struct tty_struct *tty) -{ - struct esp_struct *info = tty->driver_data; - unsigned long flags; -#ifdef SERIAL_DEBUG_THROTTLE - char buf[64]; - - printk("throttle %s: %d....\n", tty_name(tty, buf), - tty_chars_in_buffer(tty)); -#endif - - if (serial_paranoia_check(info, tty->name, "rs_throttle")) - return; - - spin_lock_irqsave(&info->lock, flags); - info->IER &= ~UART_IER_RDI; - serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK); - serial_out(info, UART_ESI_CMD2, info->IER); - serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT); - serial_out(info, UART_ESI_CMD2, 0x00); - spin_unlock_irqrestore(&info->lock, flags); -} - -static void rs_unthrottle(struct tty_struct *tty) -{ - struct esp_struct *info = tty->driver_data; - unsigned long flags; -#ifdef SERIAL_DEBUG_THROTTLE - char buf[64]; - - printk(KERN_DEBUG "unthrottle %s: %d....\n", tty_name(tty, buf), - tty_chars_in_buffer(tty)); -#endif - - if (serial_paranoia_check(info, tty->name, "rs_unthrottle")) - return; - - spin_lock_irqsave(&info->lock, flags); - info->IER |= UART_IER_RDI; - serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK); - serial_out(info, UART_ESI_CMD2, info->IER); - serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT); - serial_out(info, UART_ESI_CMD2, info->config.rx_timeout); - spin_unlock_irqrestore(&info->lock, flags); -} - -/* - * ------------------------------------------------------------ - * rs_ioctl() and friends - * ------------------------------------------------------------ - */ - -static int get_serial_info(struct esp_struct *info, - struct serial_struct __user *retinfo) -{ - struct serial_struct tmp; - - lock_kernel(); - memset(&tmp, 0, sizeof(tmp)); - tmp.type = PORT_16550A; - tmp.line = info->line; - tmp.port = info->io_port; - tmp.irq = info->irq; - tmp.flags = info->port.flags; - tmp.xmit_fifo_size = 1024; - tmp.baud_base = BASE_BAUD; - tmp.close_delay = info->close_delay; - tmp.closing_wait = info->closing_wait; - tmp.custom_divisor = info->custom_divisor; - tmp.hub6 = 0; - unlock_kernel(); - if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) - return -EFAULT; - return 0; -} - -static int get_esp_config(struct esp_struct *info, - struct hayes_esp_config __user *retinfo) -{ - struct hayes_esp_config tmp; - - if (!retinfo) - return -EFAULT; - - memset(&tmp, 0, sizeof(tmp)); - lock_kernel(); - tmp.rx_timeout = info->config.rx_timeout; - tmp.rx_trigger = info->config.rx_trigger; - tmp.tx_trigger = info->config.tx_trigger; - tmp.flow_off = info->config.flow_off; - tmp.flow_on = info->config.flow_on; - tmp.pio_threshold = info->config.pio_threshold; - tmp.dma_channel = (info->stat_flags & ESP_STAT_NEVER_DMA ? 0 : dma); - unlock_kernel(); - - return copy_to_user(retinfo, &tmp, sizeof(*retinfo)) ? -EFAULT : 0; -} - -static int set_serial_info(struct esp_struct *info, - struct serial_struct __user *new_info) -{ - struct serial_struct new_serial; - struct esp_struct old_info; - unsigned int change_irq; - int retval = 0; - struct esp_struct *current_async; - - if (copy_from_user(&new_serial, new_info, sizeof(new_serial))) - return -EFAULT; - old_info = *info; - - if ((new_serial.type != PORT_16550A) || - (new_serial.hub6) || - (info->io_port != new_serial.port) || - (new_serial.baud_base != BASE_BAUD) || - (new_serial.irq > 15) || - (new_serial.irq < 2) || - (new_serial.irq == 6) || - (new_serial.irq == 8) || - (new_serial.irq == 13)) - return -EINVAL; - - change_irq = new_serial.irq != info->irq; - - if (change_irq && (info->line % 8)) - return -EINVAL; - - if (!capable(CAP_SYS_ADMIN)) { - if (change_irq || - (new_serial.close_delay != info->close_delay) || - ((new_serial.flags & ~ASYNC_USR_MASK) != - (info->port.flags & ~ASYNC_USR_MASK))) - return -EPERM; - info->port.flags = ((info->port.flags & ~ASYNC_USR_MASK) | - (new_serial.flags & ASYNC_USR_MASK)); - info->custom_divisor = new_serial.custom_divisor; - } else { - if (new_serial.irq == 2) - new_serial.irq = 9; - - if (change_irq) { - current_async = ports; - - while (current_async) { - if ((current_async->line >= info->line) && - (current_async->line < (info->line + 8))) { - if (current_async == info) { - if (current_async->port.count > 1) - return -EBUSY; - } else if (current_async->port.count) - return -EBUSY; - } - - current_async = current_async->next_port; - } - } - - /* - * OK, past this point, all the error checking has been done. - * At this point, we start making changes..... - */ - - info->port.flags = ((info->port.flags & ~ASYNC_FLAGS) | - (new_serial.flags & ASYNC_FLAGS)); - info->custom_divisor = new_serial.custom_divisor; - info->close_delay = new_serial.close_delay * HZ/100; - info->closing_wait = new_serial.closing_wait * HZ/100; - - if (change_irq) { - /* - * We need to shutdown the serial port at the old - * port/irq combination. - */ - shutdown(info); - - current_async = ports; - - while (current_async) { - if ((current_async->line >= info->line) && - (current_async->line < (info->line + 8))) - current_async->irq = new_serial.irq; - - current_async = current_async->next_port; - } - - serial_out(info, UART_ESI_CMD1, ESI_SET_ENH_IRQ); - if (info->irq == 9) - serial_out(info, UART_ESI_CMD2, 0x02); - else - serial_out(info, UART_ESI_CMD2, info->irq); - } - } - - if (info->port.flags & ASYNC_INITIALIZED) { - if (((old_info.port.flags & ASYNC_SPD_MASK) != - (info->port.flags & ASYNC_SPD_MASK)) || - (old_info.custom_divisor != info->custom_divisor)) { - if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI) - info->port.tty->alt_speed = 57600; - if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI) - info->port.tty->alt_speed = 115200; - if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI) - info->port.tty->alt_speed = 230400; - if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP) - info->port.tty->alt_speed = 460800; - change_speed(info); - } - } else - retval = startup(info); - - return retval; -} - -static int set_esp_config(struct esp_struct *info, - struct hayes_esp_config __user *new_info) -{ - struct hayes_esp_config new_config; - unsigned int change_dma; - int retval = 0; - struct esp_struct *current_async; - unsigned long flags; - - /* Perhaps a non-sysadmin user should be able to do some of these */ - /* operations. I haven't decided yet. */ - - if (!capable(CAP_SYS_ADMIN)) - return -EPERM; - - if (copy_from_user(&new_config, new_info, sizeof(new_config))) - return -EFAULT; - - if ((new_config.flow_on >= new_config.flow_off) || - (new_config.rx_trigger < 1) || - (new_config.tx_trigger < 1) || - (new_config.flow_off < 1) || - (new_config.flow_on < 1) || - (new_config.rx_trigger > 1023) || - (new_config.tx_trigger > 1023) || - (new_config.flow_off > 1023) || - (new_config.flow_on > 1023) || - (new_config.pio_threshold < 0) || - (new_config.pio_threshold > 1024)) - return -EINVAL; - - if ((new_config.dma_channel != 1) && (new_config.dma_channel != 3)) - new_config.dma_channel = 0; - - if (info->stat_flags & ESP_STAT_NEVER_DMA) - change_dma = new_config.dma_channel; - else - change_dma = (new_config.dma_channel != dma); - - if (change_dma) { - if (new_config.dma_channel) { - /* PIO mode to DMA mode transition OR */ - /* change current DMA channel */ - current_async = ports; - - while (current_async) { - if (current_async == info) { - if (current_async->port.count > 1) - return -EBUSY; - } else if (current_async->port.count) - return -EBUSY; - - current_async = current_async->next_port; - } - - shutdown(info); - dma = new_config.dma_channel; - info->stat_flags &= ~ESP_STAT_NEVER_DMA; - - /* all ports must use the same DMA channel */ - - spin_lock_irqsave(&info->lock, flags); - current_async = ports; - - while (current_async) { - esp_basic_init(current_async); - current_async = current_async->next_port; - } - spin_unlock_irqrestore(&info->lock, flags); - } else { - /* DMA mode to PIO mode only */ - if (info->port.count > 1) - return -EBUSY; - - shutdown(info); - spin_lock_irqsave(&info->lock, flags); - info->stat_flags |= ESP_STAT_NEVER_DMA; - esp_basic_init(info); - spin_unlock_irqrestore(&info->lock, flags); - } - } - - info->config.pio_threshold = new_config.pio_threshold; - - if ((new_config.flow_off != info->config.flow_off) || - (new_config.flow_on != info->config.flow_on)) { - info->config.flow_off = new_config.flow_off; - info->config.flow_on = new_config.flow_on; - - spin_lock_irqsave(&info->lock, flags); - serial_out(info, UART_ESI_CMD1, ESI_SET_FLOW_LVL); - serial_out(info, UART_ESI_CMD2, new_config.flow_off >> 8); - serial_out(info, UART_ESI_CMD2, new_config.flow_off); - serial_out(info, UART_ESI_CMD2, new_config.flow_on >> 8); - serial_out(info, UART_ESI_CMD2, new_config.flow_on); - spin_unlock_irqrestore(&info->lock, flags); - } - - if ((new_config.rx_trigger != info->config.rx_trigger) || - (new_config.tx_trigger != info->config.tx_trigger)) { - info->config.rx_trigger = new_config.rx_trigger; - info->config.tx_trigger = new_config.tx_trigger; - spin_lock_irqsave(&info->lock, flags); - serial_out(info, UART_ESI_CMD1, ESI_SET_TRIGGER); - serial_out(info, UART_ESI_CMD2, - new_config.rx_trigger >> 8); - serial_out(info, UART_ESI_CMD2, new_config.rx_trigger); - serial_out(info, UART_ESI_CMD2, - new_config.tx_trigger >> 8); - serial_out(info, UART_ESI_CMD2, new_config.tx_trigger); - spin_unlock_irqrestore(&info->lock, flags); - } - - if (new_config.rx_timeout != info->config.rx_timeout) { - info->config.rx_timeout = new_config.rx_timeout; - spin_lock_irqsave(&info->lock, flags); - - if (info->IER & UART_IER_RDI) { - serial_out(info, UART_ESI_CMD1, - ESI_SET_RX_TIMEOUT); - serial_out(info, UART_ESI_CMD2, - new_config.rx_timeout); - } - - spin_unlock_irqrestore(&info->lock, flags); - } - - if (!(info->port.flags & ASYNC_INITIALIZED)) - retval = startup(info); - - return retval; -} - -/* - * get_lsr_info - get line status register info - * - * Purpose: Let user call ioctl() to get info when the UART physically - * is emptied. On bus types like RS485, the transmitter must - * release the bus after transmitting. This must be done when - * the transmit shift register is empty, not be done when the - * transmit holding register is empty. This functionality - * allows an RS485 driver to be written in user space. - */ -static int get_lsr_info(struct esp_struct *info, unsigned int __user *value) -{ - unsigned char status; - unsigned int result; - unsigned long flags; - - spin_lock_irqsave(&info->lock, flags); - serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT); - status = serial_in(info, UART_ESI_STAT1); - spin_unlock_irqrestore(&info->lock, flags); - result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0); - return put_user(result, value); -} - - -static int esp_tiocmget(struct tty_struct *tty, struct file *file) -{ - struct esp_struct *info = tty->driver_data; - unsigned char control, status; - unsigned long flags; - - if (serial_paranoia_check(info, tty->name, __func__)) - return -ENODEV; - if (tty->flags & (1 << TTY_IO_ERROR)) - return -EIO; - - control = info->MCR; - - spin_lock_irqsave(&info->lock, flags); - serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT); - status = serial_in(info, UART_ESI_STAT2); - spin_unlock_irqrestore(&info->lock, flags); - - return ((control & UART_MCR_RTS) ? TIOCM_RTS : 0) - | ((control & UART_MCR_DTR) ? TIOCM_DTR : 0) - | ((status & UART_MSR_DCD) ? TIOCM_CAR : 0) - | ((status & UART_MSR_RI) ? TIOCM_RNG : 0) - | ((status & UART_MSR_DSR) ? TIOCM_DSR : 0) - | ((status & UART_MSR_CTS) ? TIOCM_CTS : 0); -} - -static int esp_tiocmset(struct tty_struct *tty, struct file *file, - unsigned int set, unsigned int clear) -{ - struct esp_struct *info = tty->driver_data; - unsigned long flags; - - if (serial_paranoia_check(info, tty->name, __func__)) - return -ENODEV; - if (tty->flags & (1 << TTY_IO_ERROR)) - return -EIO; - - spin_lock_irqsave(&info->lock, flags); - - if (set & TIOCM_RTS) - info->MCR |= UART_MCR_RTS; - if (set & TIOCM_DTR) - info->MCR |= UART_MCR_DTR; - - if (clear & TIOCM_RTS) - info->MCR &= ~UART_MCR_RTS; - if (clear & TIOCM_DTR) - info->MCR &= ~UART_MCR_DTR; - - serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART); - serial_out(info, UART_ESI_CMD2, UART_MCR); - serial_out(info, UART_ESI_CMD2, info->MCR); - - spin_unlock_irqrestore(&info->lock, flags); - return 0; -} - -/* - * rs_break() --- routine which turns the break handling on or off - */ -static int esp_break(struct tty_struct *tty, int break_state) -{ - struct esp_struct *info = tty->driver_data; - unsigned long flags; - - if (serial_paranoia_check(info, tty->name, "esp_break")) - return -EINVAL; - - if (break_state == -1) { - spin_lock_irqsave(&info->lock, flags); - serial_out(info, UART_ESI_CMD1, ESI_ISSUE_BREAK); - serial_out(info, UART_ESI_CMD2, 0x01); - spin_unlock_irqrestore(&info->lock, flags); - - /* FIXME - new style wait needed here */ - interruptible_sleep_on(&info->break_wait); - } else { - spin_lock_irqsave(&info->lock, flags); - serial_out(info, UART_ESI_CMD1, ESI_ISSUE_BREAK); - serial_out(info, UART_ESI_CMD2, 0x00); - spin_unlock_irqrestore(&info->lock, flags); - } - return 0; -} - -static int rs_ioctl(struct tty_struct *tty, struct file *file, - unsigned int cmd, unsigned long arg) -{ - struct esp_struct *info = tty->driver_data; - struct async_icount cprev, cnow; /* kernel counter temps */ - struct serial_icounter_struct __user *p_cuser; /* user space */ - void __user *argp = (void __user *)arg; - unsigned long flags; - int ret; - - if (serial_paranoia_check(info, tty->name, "rs_ioctl")) - return -ENODEV; - - if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) && - (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) && - (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT) && - (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT) && - (cmd != TIOCGHAYESESP) && (cmd != TIOCSHAYESESP)) { - if (tty->flags & (1 << TTY_IO_ERROR)) - return -EIO; - } - - switch (cmd) { - case TIOCGSERIAL: - return get_serial_info(info, argp); - case TIOCSSERIAL: - lock_kernel(); - ret = set_serial_info(info, argp); - unlock_kernel(); - return ret; - case TIOCSERGWILD: - return put_user(0L, (unsigned long __user *)argp); - case TIOCSERGETLSR: /* Get line status register */ - return get_lsr_info(info, argp); - case TIOCSERSWILD: - if (!capable(CAP_SYS_ADMIN)) - return -EPERM; - return 0; - /* - * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change - * - mask passed in arg for lines of interest - * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking) - * Caller should use TIOCGICOUNT to see which one it was - */ - case TIOCMIWAIT: - spin_lock_irqsave(&info->lock, flags); - cprev = info->icount; /* note the counters on entry */ - spin_unlock_irqrestore(&info->lock, flags); - while (1) { - /* FIXME: convert to new style wakeup */ - interruptible_sleep_on(&info->port.delta_msr_wait); - /* see if a signal did it */ - if (signal_pending(current)) - return -ERESTARTSYS; - spin_lock_irqsave(&info->lock, flags); - cnow = info->icount; /* atomic copy */ - spin_unlock_irqrestore(&info->lock, flags); - if (cnow.rng == cprev.rng && - cnow.dsr == cprev.dsr && - cnow.dcd == cprev.dcd && - cnow.cts == cprev.cts) - return -EIO; /* no change => error */ - if (((arg & TIOCM_RNG) && - (cnow.rng != cprev.rng)) || - ((arg & TIOCM_DSR) && - (cnow.dsr != cprev.dsr)) || - ((arg & TIOCM_CD) && - (cnow.dcd != cprev.dcd)) || - ((arg & TIOCM_CTS) && - (cnow.cts != cprev.cts))) { - return 0; - } - cprev = cnow; - } - /* NOTREACHED */ - /* - * Get counter of input serial line interrupts (DCD,RI,DSR,CTS) - * Return: write counters to the user passed counter struct - * NB: both 1->0 and 0->1 transitions are counted except for - * RI where only 0->1 is counted. - */ - case TIOCGICOUNT: - spin_lock_irqsave(&info->lock, flags); - cnow = info->icount; - spin_unlock_irqrestore(&info->lock, flags); - p_cuser = argp; - if (put_user(cnow.cts, &p_cuser->cts) || - put_user(cnow.dsr, &p_cuser->dsr) || - put_user(cnow.rng, &p_cuser->rng) || - put_user(cnow.dcd, &p_cuser->dcd)) - return -EFAULT; - return 0; - case TIOCGHAYESESP: - return get_esp_config(info, argp); - case TIOCSHAYESESP: - lock_kernel(); - ret = set_esp_config(info, argp); - unlock_kernel(); - return ret; - default: - return -ENOIOCTLCMD; - } - return 0; -} - -static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios) -{ - struct esp_struct *info = tty->driver_data; - unsigned long flags; - - change_speed(info); - - spin_lock_irqsave(&info->lock, flags); - - /* Handle transition to B0 status */ - if ((old_termios->c_cflag & CBAUD) && - !(tty->termios->c_cflag & CBAUD)) { - info->MCR &= ~(UART_MCR_DTR|UART_MCR_RTS); - serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART); - serial_out(info, UART_ESI_CMD2, UART_MCR); - serial_out(info, UART_ESI_CMD2, info->MCR); - } - - /* Handle transition away from B0 status */ - if (!(old_termios->c_cflag & CBAUD) && - (tty->termios->c_cflag & CBAUD)) { - info->MCR |= (UART_MCR_DTR | UART_MCR_RTS); - serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART); - serial_out(info, UART_ESI_CMD2, UART_MCR); - serial_out(info, UART_ESI_CMD2, info->MCR); - } - - spin_unlock_irqrestore(&info->lock, flags); - - /* Handle turning of CRTSCTS */ - if ((old_termios->c_cflag & CRTSCTS) && - !(tty->termios->c_cflag & CRTSCTS)) { - rs_start(tty); - } -} - -/* - * ------------------------------------------------------------ - * rs_close() - * - * This routine is called when the serial port gets closed. First, we - * wait for the last remaining data to be sent. Then, we unlink its - * async structure from the interrupt chain if necessary, and we free - * that IRQ if nothing is left in the chain. - * ------------------------------------------------------------ - */ -static void rs_close(struct tty_struct *tty, struct file *filp) -{ - struct esp_struct *info = tty->driver_data; - unsigned long flags; - - if (!info || serial_paranoia_check(info, tty->name, "rs_close")) - return; - - spin_lock_irqsave(&info->lock, flags); - - if (tty_hung_up_p(filp)) { - DBG_CNT("before DEC-hung"); - goto out; - } - -#ifdef SERIAL_DEBUG_OPEN - printk(KERN_DEBUG "rs_close ttys%d, count = %d\n", - info->line, info->port.count); -#endif - if (tty->count == 1 && info->port.count != 1) { - /* - * Uh, oh. tty->count is 1, which means that the tty - * structure will be freed. Info->count should always - * be one in these conditions. If it's greater than - * one, we've got real problems, since it means the - * serial port won't be shutdown. - */ - printk(KERN_DEBUG "rs_close: bad serial port count; tty->count is 1, info->port.count is %d\n", info->port.count); - info->port.count = 1; - } - if (--info->port.count < 0) { - printk(KERN_ERR "rs_close: bad serial port count for ttys%d: %d\n", - info->line, info->port.count); - info->port.count = 0; - } - if (info->port.count) { - DBG_CNT("before DEC-2"); - goto out; - } - info->port.flags |= ASYNC_CLOSING; - - spin_unlock_irqrestore(&info->lock, flags); - /* - * Now we wait for the transmit buffer to clear; and we notify - * the line discipline to only process XON/XOFF characters. - */ - tty->closing = 1; - if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE) - tty_wait_until_sent(tty, info->closing_wait); - /* - * At this point we stop accepting input. To do this, we - * disable the receive line status interrupts, and tell the - * interrupt driver to stop checking the data ready bit in the - * line status register. - */ - /* info->IER &= ~UART_IER_RLSI; */ - info->IER &= ~UART_IER_RDI; - info->read_status_mask &= ~UART_LSR_DR; - if (info->port.flags & ASYNC_INITIALIZED) { - - spin_lock_irqsave(&info->lock, flags); - serial_out(info, UART_ESI_CMD1, ESI_SET_SRV_MASK); - serial_out(info, UART_ESI_CMD2, info->IER); - - /* disable receive timeout */ - serial_out(info, UART_ESI_CMD1, ESI_SET_RX_TIMEOUT); - serial_out(info, UART_ESI_CMD2, 0x00); - - spin_unlock_irqrestore(&info->lock, flags); - - /* - * Before we drop DTR, make sure the UART transmitter - * has completely drained; this is especially - * important if there is a transmit FIFO! - */ - rs_wait_until_sent(tty, info->timeout); - } - shutdown(info); - rs_flush_buffer(tty); - tty_ldisc_flush(tty); - tty->closing = 0; - info->port.tty = NULL; - - if (info->port.blocked_open) { - if (info->close_delay) - msleep_interruptible(jiffies_to_msecs(info->close_delay)); - wake_up_interruptible(&info->port.open_wait); - } - info->port.flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING); - wake_up_interruptible(&info->port.close_wait); - return; - -out: - spin_unlock_irqrestore(&info->lock, flags); -} - -static void rs_wait_until_sent(struct tty_struct *tty, int timeout) -{ - struct esp_struct *info = tty->driver_data; - unsigned long orig_jiffies, char_time; - unsigned long flags; - - if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent")) - return; - - orig_jiffies = jiffies; - char_time = ((info->timeout - HZ / 50) / 1024) / 5; - - if (!char_time) - char_time = 1; - - spin_lock_irqsave(&info->lock, flags); - serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND); - serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL); - - while ((serial_in(info, UART_ESI_STAT1) != 0x03) || - (serial_in(info, UART_ESI_STAT2) != 0xff)) { - - spin_unlock_irqrestore(&info->lock, flags); - msleep_interruptible(jiffies_to_msecs(char_time)); - - if (signal_pending(current)) - return; - - if (timeout && time_after(jiffies, orig_jiffies + timeout)) - return; - - spin_lock_irqsave(&info->lock, flags); - serial_out(info, UART_ESI_CMD1, ESI_NO_COMMAND); - serial_out(info, UART_ESI_CMD1, ESI_GET_TX_AVAIL); - } - spin_unlock_irqrestore(&info->lock, flags); - set_current_state(TASK_RUNNING); -} - -/* - * esp_hangup() --- called by tty_hangup() when a hangup is signaled. - */ -static void esp_hangup(struct tty_struct *tty) -{ - struct esp_struct *info = tty->driver_data; - - if (serial_paranoia_check(info, tty->name, "esp_hangup")) - return; - - rs_flush_buffer(tty); - shutdown(info); - info->port.count = 0; - info->port.flags &= ~ASYNC_NORMAL_ACTIVE; - info->port.tty = NULL; - wake_up_interruptible(&info->port.open_wait); -} - -static int esp_carrier_raised(struct tty_port *port) -{ - struct esp_struct *info = container_of(port, struct esp_struct, port); - serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT); - if (serial_in(info, UART_ESI_STAT2) & UART_MSR_DCD) - return 1; - return 0; -} - -/* - * ------------------------------------------------------------ - * esp_open() and friends - * ------------------------------------------------------------ - */ -static int block_til_ready(struct tty_struct *tty, struct file *filp, - struct esp_struct *info) -{ - DECLARE_WAITQUEUE(wait, current); - int retval; - int do_clocal = 0; - unsigned long flags; - int cd; - struct tty_port *port = &info->port; - - /* - * If the device is in the middle of being closed, then block - * until it's done, and then try again. - */ - if (tty_hung_up_p(filp) || - (port->flags & ASYNC_CLOSING)) { - if (port->flags & ASYNC_CLOSING) - interruptible_sleep_on(&port->close_wait); -#ifdef SERIAL_DO_RESTART - if (port->flags & ASYNC_HUP_NOTIFY) - return -EAGAIN; - else - return -ERESTARTSYS; -#else - return -EAGAIN; -#endif - } - - /* - * If non-blocking mode is set, or the port is not enabled, - * then make the check up front and then exit. - */ - if ((filp->f_flags & O_NONBLOCK) || - (tty->flags & (1 << TTY_IO_ERROR))) { - port->flags |= ASYNC_NORMAL_ACTIVE; - return 0; - } - - if (tty->termios->c_cflag & CLOCAL) - do_clocal = 1; - - /* - * Block waiting for the carrier detect and the line to become - * free (i.e., not in use by the callout). While we are in - * this loop, port->count is dropped by one, so that - * rs_close() knows when to free things. We restore it upon - * exit, either normal or abnormal. - */ - retval = 0; - add_wait_queue(&port->open_wait, &wait); -#ifdef SERIAL_DEBUG_OPEN - printk(KERN_DEBUG "block_til_ready before block: ttys%d, count = %d\n", - info->line, port->count); -#endif - spin_lock_irqsave(&info->lock, flags); - if (!tty_hung_up_p(filp)) - port->count--; - port->blocked_open++; - while (1) { - if ((tty->termios->c_cflag & CBAUD)) { - unsigned int scratch; - - serial_out(info, UART_ESI_CMD1, ESI_READ_UART); - serial_out(info, UART_ESI_CMD2, UART_MCR); - scratch = serial_in(info, UART_ESI_STAT1); - serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART); - serial_out(info, UART_ESI_CMD2, UART_MCR); - serial_out(info, UART_ESI_CMD2, - scratch | UART_MCR_DTR | UART_MCR_RTS); - } - set_current_state(TASK_INTERRUPTIBLE); - if (tty_hung_up_p(filp) || - !(port->flags & ASYNC_INITIALIZED)) { -#ifdef SERIAL_DO_RESTART - if (port->flags & ASYNC_HUP_NOTIFY) - retval = -EAGAIN; - else - retval = -ERESTARTSYS; -#else - retval = -EAGAIN; -#endif - break; - } - - cd = tty_port_carrier_raised(port); - - if (!(port->flags & ASYNC_CLOSING) && - (do_clocal)) - break; - if (signal_pending(current)) { - retval = -ERESTARTSYS; - break; - } -#ifdef SERIAL_DEBUG_OPEN - printk(KERN_DEBUG "block_til_ready blocking: ttys%d, count = %d\n", - info->line, port->count); -#endif - spin_unlock_irqrestore(&info->lock, flags); - schedule(); - spin_lock_irqsave(&info->lock, flags); - } - set_current_state(TASK_RUNNING); - remove_wait_queue(&port->open_wait, &wait); - if (!tty_hung_up_p(filp)) - port->count++; - port->blocked_open--; - spin_unlock_irqrestore(&info->lock, flags); -#ifdef SERIAL_DEBUG_OPEN - printk(KERN_DEBUG "block_til_ready after blocking: ttys%d, count = %d\n", - info->line, port->count); -#endif - if (retval) - return retval; - port->flags |= ASYNC_NORMAL_ACTIVE; - return 0; -} - -/* - * This routine is called whenever a serial port is opened. It - * enables interrupts for a serial port, linking in its async structure into - * the IRQ chain. It also performs the serial-specific - * initialization for the tty structure. - */ -static int esp_open(struct tty_struct *tty, struct file *filp) -{ - struct esp_struct *info; - int retval, line; - unsigned long flags; - - line = tty->index; - if ((line < 0) || (line >= NR_PORTS)) - return -ENODEV; - - /* find the port in the chain */ - - info = ports; - - while (info && (info->line != line)) - info = info->next_port; - - if (!info) { - serial_paranoia_check(info, tty->name, "esp_open"); - return -ENODEV; - } - -#ifdef SERIAL_DEBUG_OPEN - printk(KERN_DEBUG "esp_open %s, count = %d\n", tty->name, info->port.count); -#endif - spin_lock_irqsave(&info->lock, flags); - info->port.count++; - tty->driver_data = info; - info->port.tty = tty; - - spin_unlock_irqrestore(&info->lock, flags); - - /* - * Start up serial port - */ - retval = startup(info); - if (retval) - return retval; - - retval = block_til_ready(tty, filp, info); - if (retval) { -#ifdef SERIAL_DEBUG_OPEN - printk(KERN_DEBUG "esp_open returning after block_til_ready with %d\n", - retval); -#endif - return retval; - } -#ifdef SERIAL_DEBUG_OPEN - printk(KERN_DEBUG "esp_open %s successful...", tty->name); -#endif - return 0; -} - -/* - * --------------------------------------------------------------------- - * espserial_init() and friends - * - * espserial_init() is called at boot-time to initialize the serial driver. - * --------------------------------------------------------------------- - */ - -/* - * This routine prints out the appropriate serial driver version - * number, and identifies which options were configured into this - * driver. - */ - -static void __init show_serial_version(void) -{ - printk(KERN_INFO "%s version %s (DMA %u)\n", - serial_name, serial_version, dma); -} - -/* - * This routine is called by espserial_init() to initialize a specific serial - * port. - */ -static int autoconfig(struct esp_struct *info) -{ - int port_detected = 0; - unsigned long flags; - - if (!request_region(info->io_port, REGION_SIZE, "esp serial")) - return -EIO; - - spin_lock_irqsave(&info->lock, flags); - /* - * Check for ESP card - */ - - if (serial_in(info, UART_ESI_BASE) == 0xf3) { - serial_out(info, UART_ESI_CMD1, 0x00); - serial_out(info, UART_ESI_CMD1, 0x01); - - if ((serial_in(info, UART_ESI_STAT2) & 0x70) == 0x20) { - port_detected = 1; - - if (!(info->irq)) { - serial_out(info, UART_ESI_CMD1, 0x02); - - if (serial_in(info, UART_ESI_STAT1) & 0x01) - info->irq = 3; - else - info->irq = 4; - } - - - /* put card in enhanced mode */ - /* this prevents access through */ - /* the "old" IO ports */ - esp_basic_init(info); - - /* clear out MCR */ - serial_out(info, UART_ESI_CMD1, ESI_WRITE_UART); - serial_out(info, UART_ESI_CMD2, UART_MCR); - serial_out(info, UART_ESI_CMD2, 0x00); - } - } - if (!port_detected) - release_region(info->io_port, REGION_SIZE); - - spin_unlock_irqrestore(&info->lock, flags); - return (port_detected); -} - -static const struct tty_operations esp_ops = { - .open = esp_open, - .close = rs_close, - .write = rs_write, - .put_char = rs_put_char, - .flush_chars = rs_flush_chars, - .write_room = rs_write_room, - .chars_in_buffer = rs_chars_in_buffer, - .flush_buffer = rs_flush_buffer, - .ioctl = rs_ioctl, - .throttle = rs_throttle, - .unthrottle = rs_unthrottle, - .set_termios = rs_set_termios, - .stop = rs_stop, - .start = rs_start, - .hangup = esp_hangup, - .break_ctl = esp_break, - .wait_until_sent = rs_wait_until_sent, - .tiocmget = esp_tiocmget, - .tiocmset = esp_tiocmset, -}; - -static const struct tty_port_operations esp_port_ops = { - .esp_carrier_raised, -}; - -/* - * The serial driver boot-time initialization code! - */ -static int __init espserial_init(void) -{ - int i, offset; - struct esp_struct *info; - struct esp_struct *last_primary = NULL; - int esp[] = { 0x100, 0x140, 0x180, 0x200, 0x240, 0x280, 0x300, 0x380 }; - - esp_driver = alloc_tty_driver(NR_PORTS); - if (!esp_driver) - return -ENOMEM; - - for (i = 0; i < NR_PRIMARY; i++) { - if (irq[i] != 0) { - if ((irq[i] < 2) || (irq[i] > 15) || (irq[i] == 6) || - (irq[i] == 8) || (irq[i] == 13)) - irq[i] = 0; - else if (irq[i] == 2) - irq[i] = 9; - } - } - - if ((dma != 1) && (dma != 3)) - dma = 0; - - if ((rx_trigger < 1) || (rx_trigger > 1023)) - rx_trigger = 768; - - if ((tx_trigger < 1) || (tx_trigger > 1023)) - tx_trigger = 768; - - if ((flow_off < 1) || (flow_off > 1023)) - flow_off = 1016; - - if ((flow_on < 1) || (flow_on > 1023)) - flow_on = 944; - - if ((rx_timeout < 0) || (rx_timeout > 255)) - rx_timeout = 128; - - if (flow_on >= flow_off) - flow_on = flow_off - 1; - - show_serial_version(); - - /* Initialize the tty_driver structure */ - - esp_driver->owner = THIS_MODULE; - esp_driver->name = "ttyP"; - esp_driver->major = ESP_IN_MAJOR; - esp_driver->minor_start = 0; - esp_driver->type = TTY_DRIVER_TYPE_SERIAL; - esp_driver->subtype = SERIAL_TYPE_NORMAL; - esp_driver->init_termios = tty_std_termios; - esp_driver->init_termios.c_cflag = - B9600 | CS8 | CREAD | HUPCL | CLOCAL; - esp_driver->init_termios.c_ispeed = 9600; - esp_driver->init_termios.c_ospeed = 9600; - esp_driver->flags = TTY_DRIVER_REAL_RAW; - tty_set_operations(esp_driver, &esp_ops); - if (tty_register_driver(esp_driver)) { - printk(KERN_ERR "Couldn't register esp serial driver"); - put_tty_driver(esp_driver); - return 1; - } - - info = kzalloc(sizeof(struct esp_struct), GFP_KERNEL); - - if (!info) { - printk(KERN_ERR "Couldn't allocate memory for esp serial device information\n"); - tty_unregister_driver(esp_driver); - put_tty_driver(esp_driver); - return 1; - } - - spin_lock_init(&info->lock); - /* rx_trigger, tx_trigger are needed by autoconfig */ - info->config.rx_trigger = rx_trigger; - info->config.tx_trigger = tx_trigger; - - i = 0; - offset = 0; - - do { - tty_port_init(&info->port); - info->port.ops = &esp_port_ops; - info->io_port = esp[i] + offset; - info->irq = irq[i]; - info->line = (i * 8) + (offset / 8); - - if (!autoconfig(info)) { - i++; - offset = 0; - continue; - } - - info->custom_divisor = (divisor[i] >> (offset / 2)) & 0xf; - info->port.flags = STD_COM_FLAGS; - if (info->custom_divisor) - info->port.flags |= ASYNC_SPD_CUST; - info->magic = ESP_MAGIC; - info->close_delay = 5*HZ/10; - info->closing_wait = 30*HZ; - info->config.rx_timeout = rx_timeout; - info->config.flow_on = flow_on; - info->config.flow_off = flow_off; - info->config.pio_threshold = pio_threshold; - info->next_port = ports; - init_waitqueue_head(&info->break_wait); - ports = info; - printk(KERN_INFO "ttyP%d at 0x%04x (irq = %d) is an ESP ", - info->line, info->io_port, info->irq); - - if (info->line % 8) { - printk("secondary port\n"); - /* 8 port cards can't do DMA */ - info->stat_flags |= ESP_STAT_NEVER_DMA; - - if (last_primary) - last_primary->stat_flags |= ESP_STAT_NEVER_DMA; - } else { - printk("primary port\n"); - last_primary = info; - irq[i] = info->irq; - } - - if (!dma) - info->stat_flags |= ESP_STAT_NEVER_DMA; - - info = kzalloc(sizeof(struct esp_struct), GFP_KERNEL); - if (!info) { - printk(KERN_ERR "Couldn't allocate memory for esp serial device information\n"); - /* allow use of the already detected ports */ - return 0; - } - - spin_lock_init(&info->lock); - /* rx_trigger, tx_trigger are needed by autoconfig */ - info->config.rx_trigger = rx_trigger; - info->config.tx_trigger = tx_trigger; - - if (offset == 56) { - i++; - offset = 0; - } else { - offset += 8; - } - } while (i < NR_PRIMARY); - - /* free the last port memory allocation */ - kfree(info); - - return 0; -} - -static void __exit espserial_exit(void) -{ - int e1; - struct esp_struct *temp_async; - struct esp_pio_buffer *pio_buf; - - e1 = tty_unregister_driver(esp_driver); - if (e1) - printk(KERN_ERR "esp: failed to unregister driver (%d)\n", e1); - put_tty_driver(esp_driver); - - while (ports) { - if (ports->io_port) - release_region(ports->io_port, REGION_SIZE); - temp_async = ports->next_port; - kfree(ports); - ports = temp_async; - } - - if (dma_buffer) - free_pages((unsigned long)dma_buffer, - get_order(DMA_BUFFER_SZ)); - - while (free_pio_buf) { - pio_buf = free_pio_buf->next; - kfree(free_pio_buf); - free_pio_buf = pio_buf; - } -} - -module_init(espserial_init); -module_exit(espserial_exit); diff --git a/drivers/char/isicom.c b/drivers/char/isicom.c index 426bfdd7f3e..300d5bd6cd0 100644 --- a/drivers/char/isicom.c +++ b/drivers/char/isicom.c @@ -793,35 +793,30 @@ static inline void isicom_setup_board(struct isi_board *bp) { int channel; struct isi_port *port; - unsigned long flags; - spin_lock_irqsave(&bp->card_lock, flags); - if (bp->status & BOARD_ACTIVE) { - spin_unlock_irqrestore(&bp->card_lock, flags); - return; + bp->count++; + if (!(bp->status & BOARD_INIT)) { + port = bp->ports; + for (channel = 0; channel < bp->port_count; channel++, port++) + drop_dtr_rts(port); } - port = bp->ports; - bp->status |= BOARD_ACTIVE; - for (channel = 0; channel < bp->port_count; channel++, port++) - drop_dtr_rts(port); - spin_unlock_irqrestore(&bp->card_lock, flags); + bp->status |= BOARD_ACTIVE | BOARD_INIT; } -static int isicom_setup_port(struct tty_struct *tty) +/* Activate and thus setup board are protected from races against shutdown + by the tty_port mutex */ + +static int isicom_activate(struct tty_port *tport, struct tty_struct *tty) { - struct isi_port *port = tty->driver_data; + struct isi_port *port = container_of(tport, struct isi_port, port); struct isi_board *card = port->card; unsigned long flags; - if (port->port.flags & ASYNC_INITIALIZED) - return 0; - if (tty_port_alloc_xmit_buf(&port->port) < 0) + if (tty_port_alloc_xmit_buf(tport) < 0) return -ENOMEM; spin_lock_irqsave(&card->card_lock, flags); - clear_bit(TTY_IO_ERROR, &tty->flags); - if (port->port.count == 1) - card->count++; + isicom_setup_board(card); port->xmit_cnt = port->xmit_head = port->xmit_tail = 0; @@ -832,9 +827,7 @@ static int isicom_setup_port(struct tty_struct *tty) outw(((ISICOM_KILLTX | ISICOM_KILLRX) << 8) | 0x06, card->base); InterruptTheCard(card->base); } - isicom_config_port(tty); - port->port.flags |= ASYNC_INITIALIZED; spin_unlock_irqrestore(&card->card_lock, flags); return 0; @@ -871,85 +864,37 @@ static struct tty_port *isicom_find_port(struct tty_struct *tty) return &port->port; } - + static int isicom_open(struct tty_struct *tty, struct file *filp) { struct isi_port *port; struct isi_board *card; struct tty_port *tport; - int error = 0; tport = isicom_find_port(tty); if (tport == NULL) return -ENODEV; port = container_of(tport, struct isi_port, port); card = &isi_card[BOARD(tty->index)]; - isicom_setup_board(card); - /* FIXME: locking on port.count etc */ - port->port.count++; - tty->driver_data = port; - tty_port_tty_set(&port->port, tty); - /* FIXME: Locking on Initialized flag */ - if (!test_bit(ASYNCB_INITIALIZED, &tport->flags)) - error = isicom_setup_port(tty); - if (error == 0) - error = tty_port_block_til_ready(&port->port, tty, filp); - return error; + return tty_port_open(tport, tty, filp); } /* close et all */ -static inline void isicom_shutdown_board(struct isi_board *bp) -{ - if (bp->status & BOARD_ACTIVE) - bp->status &= ~BOARD_ACTIVE; -} - /* card->lock HAS to be held */ static void isicom_shutdown_port(struct isi_port *port) { struct isi_board *card = port->card; - struct tty_struct *tty; - - tty = tty_port_tty_get(&port->port); - - if (!(port->port.flags & ASYNC_INITIALIZED)) { - tty_kref_put(tty); - return; - } - - tty_port_free_xmit_buf(&port->port); - port->port.flags &= ~ASYNC_INITIALIZED; - /* 3rd October 2000 : Vinayak P Risbud */ - tty_port_tty_set(&port->port, NULL); - - /*Fix done by Anil .S on 30-04-2001 - remote login through isi port has dtr toggle problem - due to which the carrier drops before the password prompt - appears on the remote end. Now we drop the dtr only if the - HUPCL(Hangup on close) flag is set for the tty*/ - - if (C_HUPCL(tty)) - /* drop dtr on this port */ - drop_dtr(port); - - /* any other port uninits */ - if (tty) - set_bit(TTY_IO_ERROR, &tty->flags); if (--card->count < 0) { pr_dbg("isicom_shutdown_port: bad board(0x%lx) count %d.\n", card->base, card->count); card->count = 0; } - - /* last port was closed, shutdown that boad too */ - if (C_HUPCL(tty)) { - if (!card->count) - isicom_shutdown_board(card); - } - tty_kref_put(tty); + /* last port was closed, shutdown that board too */ + if (!card->count) + card->status &= BOARD_ACTIVE; } static void isicom_flush_buffer(struct tty_struct *tty) @@ -968,7 +913,7 @@ static void isicom_flush_buffer(struct tty_struct *tty) tty_wakeup(tty); } -static void isicom_close_port(struct tty_port *port) +static void isicom_shutdown(struct tty_port *port) { struct isi_port *ip = container_of(port, struct isi_port, port); struct isi_board *card = ip->card; @@ -977,12 +922,11 @@ static void isicom_close_port(struct tty_port *port) /* indicate to the card that no more data can be received on this port */ spin_lock_irqsave(&card->card_lock, flags); - if (port->flags & ASYNC_INITIALIZED) { - card->port_status &= ~(1 << ip->channel); - outw(card->port_status, card->base + 0x02); - } + card->port_status &= ~(1 << ip->channel); + outw(card->port_status, card->base + 0x02); isicom_shutdown_port(ip); spin_unlock_irqrestore(&card->card_lock, flags); + tty_port_free_xmit_buf(port); } static void isicom_close(struct tty_struct *tty, struct file *filp) @@ -991,12 +935,7 @@ static void isicom_close(struct tty_struct *tty, struct file *filp) struct tty_port *port = &ip->port; if (isicom_paranoia_check(ip, tty->name, "isicom_close")) return; - - if (tty_port_close_start(port, tty, filp) == 0) - return; - isicom_close_port(port); - isicom_flush_buffer(tty); - tty_port_close_end(port, tty); + tty_port_close(port, tty, filp); } /* write et all */ @@ -1326,15 +1265,9 @@ static void isicom_start(struct tty_struct *tty) static void isicom_hangup(struct tty_struct *tty) { struct isi_port *port = tty->driver_data; - unsigned long flags; if (isicom_paranoia_check(port, tty->name, "isicom_hangup")) return; - - spin_lock_irqsave(&port->card->card_lock, flags); - isicom_shutdown_port(port); - spin_unlock_irqrestore(&port->card->card_lock, flags); - tty_port_hangup(&port->port); } @@ -1367,6 +1300,8 @@ static const struct tty_operations isicom_ops = { static const struct tty_port_operations isicom_port_ops = { .carrier_raised = isicom_carrier_raised, .dtr_rts = isicom_dtr_rts, + .activate = isicom_activate, + .shutdown = isicom_shutdown, }; static int __devinit reset_card(struct pci_dev *pdev, diff --git a/drivers/char/istallion.c b/drivers/char/istallion.c index 402838f4083..4cd6c527ee4 100644 --- a/drivers/char/istallion.c +++ b/drivers/char/istallion.c @@ -213,7 +213,6 @@ static int stli_shared; * with the slave. Most of them need to be updated atomically, so always * use the bit setting operations (unless protected by cli/sti). */ -#define ST_INITIALIZING 1 #define ST_OPENING 2 #define ST_CLOSING 3 #define ST_CMDING 4 @@ -621,7 +620,7 @@ static int stli_brdinit(struct stlibrd *brdp); static int stli_startbrd(struct stlibrd *brdp); static ssize_t stli_memread(struct file *fp, char __user *buf, size_t count, loff_t *offp); static ssize_t stli_memwrite(struct file *fp, const char __user *buf, size_t count, loff_t *offp); -static int stli_memioctl(struct inode *ip, struct file *fp, unsigned int cmd, unsigned long arg); +static long stli_memioctl(struct file *fp, unsigned int cmd, unsigned long arg); static void stli_brdpoll(struct stlibrd *brdp, cdkhdr_t __iomem *hdrp); static void stli_poll(unsigned long arg); static int stli_hostcmd(struct stlibrd *brdp, struct stliport *portp); @@ -704,7 +703,7 @@ static const struct file_operations stli_fsiomem = { .owner = THIS_MODULE, .read = stli_memread, .write = stli_memwrite, - .ioctl = stli_memioctl, + .unlocked_ioctl = stli_memioctl, }; /*****************************************************************************/ @@ -783,13 +782,32 @@ static int stli_parsebrd(struct stlconf *confp, char **argp) /*****************************************************************************/ +/* + * On the first open of the device setup the port hardware, and + * initialize the per port data structure. Since initializing the port + * requires several commands to the board we will need to wait for any + * other open that is already initializing the port. + * + * Locking: protected by the port mutex. + */ + +static int stli_activate(struct tty_port *port, struct tty_struct *tty) +{ + struct stliport *portp = container_of(port, struct stliport, port); + struct stlibrd *brdp = stli_brds[portp->brdnr]; + int rc; + + if ((rc = stli_initopen(tty, brdp, portp)) >= 0) + clear_bit(TTY_IO_ERROR, &tty->flags); + wake_up_interruptible(&portp->raw_wait); + return rc; +} + static int stli_open(struct tty_struct *tty, struct file *filp) { struct stlibrd *brdp; struct stliport *portp; - struct tty_port *port; unsigned int minordev, brdnr, portnr; - int rc; minordev = tty->index; brdnr = MINOR2BRD(minordev); @@ -809,95 +827,56 @@ static int stli_open(struct tty_struct *tty, struct file *filp) return -ENODEV; if (portp->devnr < 1) return -ENODEV; - port = &portp->port; - -/* - * On the first open of the device setup the port hardware, and - * initialize the per port data structure. Since initializing the port - * requires several commands to the board we will need to wait for any - * other open that is already initializing the port. - * - * Review - locking - */ - tty_port_tty_set(port, tty); - tty->driver_data = portp; - port->count++; - - wait_event_interruptible(portp->raw_wait, - !test_bit(ST_INITIALIZING, &portp->state)); - if (signal_pending(current)) - return -ERESTARTSYS; - - if ((portp->port.flags & ASYNC_INITIALIZED) == 0) { - set_bit(ST_INITIALIZING, &portp->state); - if ((rc = stli_initopen(tty, brdp, portp)) >= 0) { - /* Locking */ - port->flags |= ASYNC_INITIALIZED; - clear_bit(TTY_IO_ERROR, &tty->flags); - } - clear_bit(ST_INITIALIZING, &portp->state); - wake_up_interruptible(&portp->raw_wait); - if (rc < 0) - return rc; - } - return tty_port_block_til_ready(&portp->port, tty, filp); + return tty_port_open(&portp->port, tty, filp); } + /*****************************************************************************/ -static void stli_close(struct tty_struct *tty, struct file *filp) +static void stli_shutdown(struct tty_port *port) { struct stlibrd *brdp; - struct stliport *portp; - struct tty_port *port; + unsigned long ftype; unsigned long flags; + struct stliport *portp = container_of(port, struct stliport, port); - portp = tty->driver_data; - if (portp == NULL) + if (portp->brdnr >= stli_nrbrds) return; - port = &portp->port; - - if (tty_port_close_start(port, tty, filp) == 0) + brdp = stli_brds[portp->brdnr]; + if (brdp == NULL) return; -/* - * May want to wait for data to drain before closing. The BUSY flag - * keeps track of whether we are still transmitting or not. It is - * updated by messages from the slave - indicating when all chars - * really have drained. - */ - spin_lock_irqsave(&stli_lock, flags); - if (tty == stli_txcooktty) - stli_flushchars(tty); - spin_unlock_irqrestore(&stli_lock, flags); - - /* We end up doing this twice for the moment. This needs looking at - eventually. Note we still use portp->closing_wait as a result */ - if (portp->closing_wait != ASYNC_CLOSING_WAIT_NONE) - tty_wait_until_sent(tty, portp->closing_wait); + /* + * May want to wait for data to drain before closing. The BUSY + * flag keeps track of whether we are still transmitting or not. + * It is updated by messages from the slave - indicating when all + * chars really have drained. + */ - /* FIXME: port locking here needs attending to */ - port->flags &= ~ASYNC_INITIALIZED; + if (!test_bit(ST_CLOSING, &portp->state)) + stli_rawclose(brdp, portp, 0, 0); - brdp = stli_brds[portp->brdnr]; - stli_rawclose(brdp, portp, 0, 0); - if (tty->termios->c_cflag & HUPCL) { - stli_mkasysigs(&portp->asig, 0, 0); - if (test_bit(ST_CMDING, &portp->state)) - set_bit(ST_DOSIGS, &portp->state); - else - stli_sendcmd(brdp, portp, A_SETSIGNALS, &portp->asig, - sizeof(asysigs_t), 0); - } + spin_lock_irqsave(&stli_lock, flags); clear_bit(ST_TXBUSY, &portp->state); clear_bit(ST_RXSTOP, &portp->state); - set_bit(TTY_IO_ERROR, &tty->flags); - tty_ldisc_flush(tty); - set_bit(ST_DOFLUSHRX, &portp->state); - stli_flushbuffer(tty); + spin_unlock_irqrestore(&stli_lock, flags); - tty_port_close_end(port, tty); - tty_port_tty_set(port, NULL); + ftype = FLUSHTX | FLUSHRX; + stli_cmdwait(brdp, portp, A_FLUSH, &ftype, sizeof(u32), 0); +} + +static void stli_close(struct tty_struct *tty, struct file *filp) +{ + struct stliport *portp = tty->driver_data; + unsigned long flags; + if (portp == NULL) + return; + spin_lock_irqsave(&stli_lock, flags); + /* Flush any internal buffering out first */ + if (tty == stli_txcooktty) + stli_flushchars(tty); + spin_unlock_irqrestore(&stli_lock, flags); + tty_port_close(&portp->port, tty, filp); } /*****************************************************************************/ @@ -1724,6 +1703,7 @@ static void stli_start(struct tty_struct *tty) /*****************************************************************************/ + /* * Hangup this port. This is pretty much like closing the port, only * a little more brutal. No waiting for data to drain. Shutdown the @@ -1733,47 +1713,8 @@ static void stli_start(struct tty_struct *tty) static void stli_hangup(struct tty_struct *tty) { - struct stliport *portp; - struct stlibrd *brdp; - struct tty_port *port; - unsigned long flags; - - portp = tty->driver_data; - if (portp == NULL) - return; - if (portp->brdnr >= stli_nrbrds) - return; - brdp = stli_brds[portp->brdnr]; - if (brdp == NULL) - return; - port = &portp->port; - - spin_lock_irqsave(&port->lock, flags); - port->flags &= ~ASYNC_INITIALIZED; - spin_unlock_irqrestore(&port->lock, flags); - - if (!test_bit(ST_CLOSING, &portp->state)) - stli_rawclose(brdp, portp, 0, 0); - - spin_lock_irqsave(&stli_lock, flags); - if (tty->termios->c_cflag & HUPCL) { - stli_mkasysigs(&portp->asig, 0, 0); - if (test_bit(ST_CMDING, &portp->state)) { - set_bit(ST_DOSIGS, &portp->state); - set_bit(ST_DOFLUSHTX, &portp->state); - set_bit(ST_DOFLUSHRX, &portp->state); - } else { - stli_sendcmd(brdp, portp, A_SETSIGNALSF, - &portp->asig, sizeof(asysigs_t), 0); - } - } - - clear_bit(ST_TXBUSY, &portp->state); - clear_bit(ST_RXSTOP, &portp->state); - set_bit(TTY_IO_ERROR, &tty->flags); - spin_unlock_irqrestore(&stli_lock, flags); - - tty_port_hangup(port); + struct stliport *portp = tty->driver_data; + tty_port_hangup(&portp->port); } /*****************************************************************************/ @@ -4311,7 +4252,7 @@ static int stli_getbrdstruct(struct stlibrd __user *arg) * reset it, and start/stop it. */ -static int stli_memioctl(struct inode *ip, struct file *fp, unsigned int cmd, unsigned long arg) +static long stli_memioctl(struct file *fp, unsigned int cmd, unsigned long arg) { struct stlibrd *brdp; int brdnr, rc, done; @@ -4356,7 +4297,7 @@ static int stli_memioctl(struct inode *ip, struct file *fp, unsigned int cmd, un * Now handle the board specific ioctls. These all depend on the * minor number of the device they were called from. */ - brdnr = iminor(ip); + brdnr = iminor(fp->f_dentry->d_inode); if (brdnr >= STL_MAXBRDS) return -ENODEV; brdp = stli_brds[brdnr]; @@ -4420,6 +4361,8 @@ static const struct tty_operations stli_ops = { static const struct tty_port_operations stli_port_ops = { .carrier_raised = stli_carrier_raised, .dtr_rts = stli_dtr_rts, + .activate = stli_activate, + .shutdown = stli_shutdown, }; /*****************************************************************************/ diff --git a/drivers/char/moxa.c b/drivers/char/moxa.c index dd0083bbb64..63ee3bbc1ce 100644 --- a/drivers/char/moxa.c +++ b/drivers/char/moxa.c @@ -34,7 +34,6 @@ #include <linux/tty.h> #include <linux/tty_flip.h> #include <linux/major.h> -#include <linux/smp_lock.h> #include <linux/string.h> #include <linux/fcntl.h> #include <linux/ptrace.h> @@ -139,7 +138,7 @@ struct moxa_port { int cflag; unsigned long statusflags; - u8 DCDState; + u8 DCDState; /* Protected by the port lock */ u8 lineCtrl; u8 lowChkFlag; }; @@ -151,10 +150,9 @@ struct mon_str { }; /* statusflags */ -#define TXSTOPPED 0x1 -#define LOWWAIT 0x2 -#define EMPTYWAIT 0x4 -#define THROTTLE 0x8 +#define TXSTOPPED 1 +#define LOWWAIT 2 +#define EMPTYWAIT 3 #define SERIAL_DO_RESTART @@ -165,6 +163,7 @@ static struct mon_str moxaLog; static unsigned int moxaFuncTout = HZ / 2; static unsigned int moxaLowWaterChk; static DEFINE_MUTEX(moxa_openlock); +static DEFINE_SPINLOCK(moxa_lock); /* Variables for insmod */ #ifdef MODULE static unsigned long baseaddr[MAX_BOARDS]; @@ -194,8 +193,6 @@ static int moxa_write(struct tty_struct *, const unsigned char *, int); static int moxa_write_room(struct tty_struct *); static void moxa_flush_buffer(struct tty_struct *); static int moxa_chars_in_buffer(struct tty_struct *); -static void moxa_throttle(struct tty_struct *); -static void moxa_unthrottle(struct tty_struct *); static void moxa_set_termios(struct tty_struct *, struct ktermios *); static void moxa_stop(struct tty_struct *); static void moxa_start(struct tty_struct *); @@ -205,9 +202,9 @@ static int moxa_tiocmset(struct tty_struct *tty, struct file *file, unsigned int set, unsigned int clear); static void moxa_poll(unsigned long); static void moxa_set_tty_param(struct tty_struct *, struct ktermios *); -static void moxa_setup_empty_event(struct tty_struct *); -static void moxa_shut_down(struct tty_struct *); +static void moxa_shutdown(struct tty_port *); static int moxa_carrier_raised(struct tty_port *); +static void moxa_dtr_rts(struct tty_port *, int); /* * moxa board interface functions: */ @@ -234,6 +231,8 @@ static void MoxaSetFifo(struct moxa_port *port, int enable); * I/O functions */ +static DEFINE_SPINLOCK(moxafunc_lock); + static void moxa_wait_finish(void __iomem *ofsAddr) { unsigned long end = jiffies + moxaFuncTout; @@ -247,9 +246,25 @@ static void moxa_wait_finish(void __iomem *ofsAddr) static void moxafunc(void __iomem *ofsAddr, u16 cmd, u16 arg) { + unsigned long flags; + spin_lock_irqsave(&moxafunc_lock, flags); writew(arg, ofsAddr + FuncArg); writew(cmd, ofsAddr + FuncCode); moxa_wait_finish(ofsAddr); + spin_unlock_irqrestore(&moxafunc_lock, flags); +} + +static int moxafuncret(void __iomem *ofsAddr, u16 cmd, u16 arg) +{ + unsigned long flags; + u16 ret; + spin_lock_irqsave(&moxafunc_lock, flags); + writew(arg, ofsAddr + FuncArg); + writew(cmd, ofsAddr + FuncCode); + moxa_wait_finish(ofsAddr); + ret = readw(ofsAddr + FuncArg); + spin_unlock_irqrestore(&moxafunc_lock, flags); + return ret; } static void moxa_low_water_check(void __iomem *ofsAddr) @@ -299,22 +314,20 @@ static int moxa_ioctl(struct tty_struct *tty, struct file *file, struct moxa_port *p; unsigned int i, j; - mutex_lock(&moxa_openlock); for (i = 0; i < MAX_BOARDS; i++) { p = moxa_boards[i].ports; for (j = 0; j < MAX_PORTS_PER_BOARD; j++, p++, argm++) { memset(&tmp, 0, sizeof(tmp)); + spin_lock_bh(&moxa_lock); if (moxa_boards[i].ready) { tmp.inq = MoxaPortRxQueue(p); tmp.outq = MoxaPortTxQueue(p); } - if (copy_to_user(argm, &tmp, sizeof(tmp))) { - mutex_unlock(&moxa_openlock); + spin_unlock_bh(&moxa_lock); + if (copy_to_user(argm, &tmp, sizeof(tmp))) return -EFAULT; - } } } - mutex_unlock(&moxa_openlock); break; } case MOXA_GET_OQUEUE: status = MoxaPortTxQueue(ch); @@ -330,16 +343,20 @@ static int moxa_ioctl(struct tty_struct *tty, struct file *file, struct moxa_port *p; unsigned int i, j; - mutex_lock(&moxa_openlock); for (i = 0; i < MAX_BOARDS; i++) { p = moxa_boards[i].ports; for (j = 0; j < MAX_PORTS_PER_BOARD; j++, p++, argm++) { struct tty_struct *ttyp; memset(&tmp, 0, sizeof(tmp)); - if (!moxa_boards[i].ready) + spin_lock_bh(&moxa_lock); + if (!moxa_boards[i].ready) { + spin_unlock_bh(&moxa_lock); goto copy; + } status = MoxaPortLineStatus(p); + spin_unlock_bh(&moxa_lock); + if (status & 1) tmp.cts = 1; if (status & 2) @@ -354,24 +371,21 @@ static int moxa_ioctl(struct tty_struct *tty, struct file *file, tmp.cflag = ttyp->termios->c_cflag; tty_kref_put(tty); copy: - if (copy_to_user(argm, &tmp, sizeof(tmp))) { - mutex_unlock(&moxa_openlock); + if (copy_to_user(argm, &tmp, sizeof(tmp))) return -EFAULT; - } } } - mutex_unlock(&moxa_openlock); break; } case TIOCGSERIAL: - mutex_lock(&moxa_openlock); + mutex_lock(&ch->port.mutex); ret = moxa_get_serial_info(ch, argp); - mutex_unlock(&moxa_openlock); + mutex_unlock(&ch->port.mutex); break; case TIOCSSERIAL: - mutex_lock(&moxa_openlock); + mutex_lock(&ch->port.mutex); ret = moxa_set_serial_info(ch, argp); - mutex_unlock(&moxa_openlock); + mutex_unlock(&ch->port.mutex); break; default: ret = -ENOIOCTLCMD; @@ -396,8 +410,6 @@ static const struct tty_operations moxa_ops = { .flush_buffer = moxa_flush_buffer, .chars_in_buffer = moxa_chars_in_buffer, .ioctl = moxa_ioctl, - .throttle = moxa_throttle, - .unthrottle = moxa_unthrottle, .set_termios = moxa_set_termios, .stop = moxa_stop, .start = moxa_start, @@ -409,11 +421,12 @@ static const struct tty_operations moxa_ops = { static const struct tty_port_operations moxa_port_ops = { .carrier_raised = moxa_carrier_raised, + .dtr_rts = moxa_dtr_rts, + .shutdown = moxa_shutdown, }; static struct tty_driver *moxaDriver; static DEFINE_TIMER(moxaTimer, moxa_poll, 0, 0); -static DEFINE_SPINLOCK(moxa_lock); /* * HW init @@ -1112,14 +1125,12 @@ static void __exit moxa_exit(void) module_init(moxa_init); module_exit(moxa_exit); -static void moxa_close_port(struct tty_struct *tty) +static void moxa_shutdown(struct tty_port *port) { - struct moxa_port *ch = tty->driver_data; - moxa_shut_down(tty); + struct moxa_port *ch = container_of(port, struct moxa_port, port); + MoxaPortDisable(ch); MoxaPortFlushData(ch, 2); - ch->port.flags &= ~ASYNC_NORMAL_ACTIVE; - tty->driver_data = NULL; - tty_port_tty_set(&ch->port, NULL); + clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags); } static int moxa_carrier_raised(struct tty_port *port) @@ -1127,45 +1138,19 @@ static int moxa_carrier_raised(struct tty_port *port) struct moxa_port *ch = container_of(port, struct moxa_port, port); int dcd; - spin_lock_bh(&moxa_lock); + spin_lock_irq(&port->lock); dcd = ch->DCDState; - spin_unlock_bh(&moxa_lock); + spin_unlock_irq(&port->lock); return dcd; } -static int moxa_block_till_ready(struct tty_struct *tty, struct file *filp, - struct moxa_port *ch) +static void moxa_dtr_rts(struct tty_port *port, int onoff) { - struct tty_port *port = &ch->port; - DEFINE_WAIT(wait); - int retval = 0; - u8 dcd; - - while (1) { - prepare_to_wait(&port->open_wait, &wait, TASK_INTERRUPTIBLE); - if (tty_hung_up_p(filp)) { -#ifdef SERIAL_DO_RESTART - retval = -ERESTARTSYS; -#else - retval = -EAGAIN; -#endif - break; - } - dcd = tty_port_carrier_raised(port); - if (dcd) - break; - - if (signal_pending(current)) { - retval = -ERESTARTSYS; - break; - } - schedule(); - } - finish_wait(&port->open_wait, &wait); - - return retval; + struct moxa_port *ch = container_of(port, struct moxa_port, port); + MoxaPortLineCtrl(ch, onoff, onoff); } + static int moxa_open(struct tty_struct *tty, struct file *filp) { struct moxa_board_conf *brd; @@ -1194,6 +1179,7 @@ static int moxa_open(struct tty_struct *tty, struct file *filp) ch->port.count++; tty->driver_data = ch; tty_port_tty_set(&ch->port, tty); + mutex_lock(&ch->port.mutex); if (!(ch->port.flags & ASYNC_INITIALIZED)) { ch->statusflags = 0; moxa_set_tty_param(tty, tty->termios); @@ -1202,58 +1188,20 @@ static int moxa_open(struct tty_struct *tty, struct file *filp) MoxaSetFifo(ch, ch->type == PORT_16550A); ch->port.flags |= ASYNC_INITIALIZED; } + mutex_unlock(&ch->port.mutex); mutex_unlock(&moxa_openlock); - retval = 0; - if (!(filp->f_flags & O_NONBLOCK) && !C_CLOCAL(tty)) - retval = moxa_block_till_ready(tty, filp, ch); - mutex_lock(&moxa_openlock); - if (retval) { - if (ch->port.count) /* 0 means already hung up... */ - if (--ch->port.count == 0) - moxa_close_port(tty); - } else - ch->port.flags |= ASYNC_NORMAL_ACTIVE; - mutex_unlock(&moxa_openlock); - + retval = tty_port_block_til_ready(&ch->port, tty, filp); + if (retval == 0) + set_bit(ASYNCB_NORMAL_ACTIVE, &ch->port.flags); return retval; } static void moxa_close(struct tty_struct *tty, struct file *filp) { - struct moxa_port *ch; - int port; - - port = tty->index; - if (port == MAX_PORTS || tty_hung_up_p(filp)) - return; - - mutex_lock(&moxa_openlock); - ch = tty->driver_data; - if (ch == NULL) - goto unlock; - if (tty->count == 1 && ch->port.count != 1) { - printk(KERN_WARNING "moxa_close: bad serial port count; " - "tty->count is 1, ch->port.count is %d\n", ch->port.count); - ch->port.count = 1; - } - if (--ch->port.count < 0) { - printk(KERN_WARNING "moxa_close: bad serial port count, " - "device=%s\n", tty->name); - ch->port.count = 0; - } - if (ch->port.count) - goto unlock; - + struct moxa_port *ch = tty->driver_data; ch->cflag = tty->termios->c_cflag; - if (ch->port.flags & ASYNC_INITIALIZED) { - moxa_setup_empty_event(tty); - tty_wait_until_sent(tty, 30 * HZ); /* 30 seconds timeout */ - } - - moxa_close_port(tty); -unlock: - mutex_unlock(&moxa_openlock); + tty_port_close(&ch->port, tty, filp); } static int moxa_write(struct tty_struct *tty, @@ -1269,7 +1217,7 @@ static int moxa_write(struct tty_struct *tty, len = MoxaPortWriteData(tty, buf, count); spin_unlock_bh(&moxa_lock); - ch->statusflags |= LOWWAIT; + set_bit(LOWWAIT, &ch->statusflags); return len; } @@ -1300,40 +1248,21 @@ static int moxa_chars_in_buffer(struct tty_struct *tty) struct moxa_port *ch = tty->driver_data; int chars; - /* - * Sigh...I have to check if driver_data is NULL here, because - * if an open() fails, the TTY subsystem eventually calls - * tty_wait_until_sent(), which calls the driver's chars_in_buffer() - * routine. And since the open() failed, we return 0 here. TDJ - */ - if (ch == NULL) - return 0; - lock_kernel(); chars = MoxaPortTxQueue(ch); - if (chars) { + if (chars) /* * Make it possible to wakeup anything waiting for output * in tty_ioctl.c, etc. */ - if (!(ch->statusflags & EMPTYWAIT)) - moxa_setup_empty_event(tty); - } - unlock_kernel(); + set_bit(EMPTYWAIT, &ch->statusflags); return chars; } static int moxa_tiocmget(struct tty_struct *tty, struct file *file) { - struct moxa_port *ch; + struct moxa_port *ch = tty->driver_data; int flag = 0, dtr, rts; - mutex_lock(&moxa_openlock); - ch = tty->driver_data; - if (!ch) { - mutex_unlock(&moxa_openlock); - return -EINVAL; - } - MoxaPortGetLineOut(ch, &dtr, &rts); if (dtr) flag |= TIOCM_DTR; @@ -1346,7 +1275,6 @@ static int moxa_tiocmget(struct tty_struct *tty, struct file *file) flag |= TIOCM_DSR; if (dtr & 4) flag |= TIOCM_CD; - mutex_unlock(&moxa_openlock); return flag; } @@ -1379,20 +1307,6 @@ static int moxa_tiocmset(struct tty_struct *tty, struct file *file, return 0; } -static void moxa_throttle(struct tty_struct *tty) -{ - struct moxa_port *ch = tty->driver_data; - - ch->statusflags |= THROTTLE; -} - -static void moxa_unthrottle(struct tty_struct *tty) -{ - struct moxa_port *ch = tty->driver_data; - - ch->statusflags &= ~THROTTLE; -} - static void moxa_set_termios(struct tty_struct *tty, struct ktermios *old_termios) { @@ -1412,7 +1326,7 @@ static void moxa_stop(struct tty_struct *tty) if (ch == NULL) return; MoxaPortTxDisable(ch); - ch->statusflags |= TXSTOPPED; + set_bit(TXSTOPPED, &ch->statusflags); } @@ -1427,38 +1341,32 @@ static void moxa_start(struct tty_struct *tty) return; MoxaPortTxEnable(ch); - ch->statusflags &= ~TXSTOPPED; + clear_bit(TXSTOPPED, &ch->statusflags); } static void moxa_hangup(struct tty_struct *tty) { - struct moxa_port *ch; - - mutex_lock(&moxa_openlock); - ch = tty->driver_data; - if (ch == NULL) { - mutex_unlock(&moxa_openlock); - return; - } - ch->port.count = 0; - moxa_close_port(tty); - mutex_unlock(&moxa_openlock); - - wake_up_interruptible(&ch->port.open_wait); + struct moxa_port *ch = tty->driver_data; + tty_port_hangup(&ch->port); } static void moxa_new_dcdstate(struct moxa_port *p, u8 dcd) { struct tty_struct *tty; + unsigned long flags; dcd = !!dcd; + spin_lock_irqsave(&p->port.lock, flags); if (dcd != p->DCDState) { + p->DCDState = dcd; + spin_unlock_irqrestore(&p->port.lock, flags); tty = tty_port_tty_get(&p->port); if (tty && C_CLOCAL(tty) && !dcd) tty_hangup(tty); tty_kref_put(tty); } - p->DCDState = dcd; + else + spin_unlock_irqrestore(&p->port.lock, flags); } static int moxa_poll_port(struct moxa_port *p, unsigned int handle, @@ -1470,24 +1378,24 @@ static int moxa_poll_port(struct moxa_port *p, unsigned int handle, u16 intr; if (tty) { - if ((p->statusflags & EMPTYWAIT) && + if (test_bit(EMPTYWAIT, &p->statusflags) && MoxaPortTxQueue(p) == 0) { - p->statusflags &= ~EMPTYWAIT; + clear_bit(EMPTYWAIT, &p->statusflags); tty_wakeup(tty); } - if ((p->statusflags & LOWWAIT) && !tty->stopped && + if (test_bit(LOWWAIT, &p->statusflags) && !tty->stopped && MoxaPortTxQueue(p) <= WAKEUP_CHARS) { - p->statusflags &= ~LOWWAIT; + clear_bit(LOWWAIT, &p->statusflags); tty_wakeup(tty); } - if (inited && !(p->statusflags & THROTTLE) && + if (inited && !test_bit(TTY_THROTTLED, &tty->flags) && MoxaPortRxQueue(p) > 0) { /* RX */ MoxaPortReadData(p); tty_schedule_flip(tty); } } else { - p->statusflags &= ~EMPTYWAIT; + clear_bit(EMPTYWAIT, &p->statusflags); MoxaPortFlushData(p, 0); /* flush RX */ } @@ -1588,35 +1496,6 @@ static void moxa_set_tty_param(struct tty_struct *tty, struct ktermios *old_term tty_encode_baud_rate(tty, baud, baud); } -static void moxa_setup_empty_event(struct tty_struct *tty) -{ - struct moxa_port *ch = tty->driver_data; - - spin_lock_bh(&moxa_lock); - ch->statusflags |= EMPTYWAIT; - spin_unlock_bh(&moxa_lock); -} - -static void moxa_shut_down(struct tty_struct *tty) -{ - struct moxa_port *ch = tty->driver_data; - - if (!(ch->port.flags & ASYNC_INITIALIZED)) - return; - - MoxaPortDisable(ch); - - /* - * If we're a modem control device and HUPCL is on, drop RTS & DTR. - */ - if (C_HUPCL(tty)) - MoxaPortLineCtrl(ch, 0, 0); - - spin_lock_bh(&moxa_lock); - ch->port.flags &= ~ASYNC_INITIALIZED; - spin_unlock_bh(&moxa_lock); -} - /***************************************************************************** * Driver level functions: * *****************************************************************************/ @@ -1918,10 +1797,12 @@ static int MoxaPortSetTermio(struct moxa_port *port, struct ktermios *termio, baud = MoxaPortSetBaud(port, baud); if (termio->c_iflag & (IXON | IXOFF | IXANY)) { + spin_lock_irq(&moxafunc_lock); writeb(termio->c_cc[VSTART], ofsAddr + FuncArg); writeb(termio->c_cc[VSTOP], ofsAddr + FuncArg1); writeb(FC_SetXonXoff, ofsAddr + FuncCode); moxa_wait_finish(ofsAddr); + spin_unlock_irq(&moxafunc_lock); } return baud; @@ -1974,18 +1855,14 @@ static int MoxaPortLineStatus(struct moxa_port *port) int val; ofsAddr = port->tableAddr; - if (MOXA_IS_320(port->board)) { - moxafunc(ofsAddr, FC_LineStatus, 0); - val = readw(ofsAddr + FuncArg); - } else { + if (MOXA_IS_320(port->board)) + val = moxafuncret(ofsAddr, FC_LineStatus, 0); + else val = readw(ofsAddr + FlagStat) >> 4; - } val &= 0x0B; if (val & 8) val |= 4; - spin_lock_bh(&moxa_lock); moxa_new_dcdstate(port, val & 8); - spin_unlock_bh(&moxa_lock); val &= 7; return val; } diff --git a/drivers/char/mxser.c b/drivers/char/mxser.c index 5e28d39b9e8..3d923065d9a 100644 --- a/drivers/char/mxser.c +++ b/drivers/char/mxser.c @@ -23,7 +23,6 @@ #include <linux/errno.h> #include <linux/signal.h> #include <linux/sched.h> -#include <linux/smp_lock.h> #include <linux/timer.h> #include <linux/interrupt.h> #include <linux/tty.h> @@ -856,9 +855,9 @@ static void mxser_check_modem_status(struct tty_struct *tty, } } -static int mxser_startup(struct tty_struct *tty) +static int mxser_activate(struct tty_port *port, struct tty_struct *tty) { - struct mxser_port *info = tty->driver_data; + struct mxser_port *info = container_of(port, struct mxser_port, port); unsigned long page; unsigned long flags; @@ -868,22 +867,13 @@ static int mxser_startup(struct tty_struct *tty) spin_lock_irqsave(&info->slock, flags); - if (info->port.flags & ASYNC_INITIALIZED) { - free_page(page); - spin_unlock_irqrestore(&info->slock, flags); - return 0; - } - if (!info->ioaddr || !info->type) { set_bit(TTY_IO_ERROR, &tty->flags); free_page(page); spin_unlock_irqrestore(&info->slock, flags); return 0; } - if (info->port.xmit_buf) - free_page(page); - else - info->port.xmit_buf = (unsigned char *) page; + info->port.xmit_buf = (unsigned char *) page; /* * Clear the FIFO buffers and disable them @@ -951,24 +941,19 @@ static int mxser_startup(struct tty_struct *tty) * and set the speed of the serial port */ mxser_change_speed(tty, NULL); - info->port.flags |= ASYNC_INITIALIZED; spin_unlock_irqrestore(&info->slock, flags); return 0; } /* - * This routine will shutdown a serial port; interrupts maybe disabled, and - * DTR is dropped if the hangup on close termio flag is on. + * This routine will shutdown a serial port */ -static void mxser_shutdown(struct tty_struct *tty) +static void mxser_shutdown_port(struct tty_port *port) { - struct mxser_port *info = tty->driver_data; + struct mxser_port *info = container_of(port, struct mxser_port, port); unsigned long flags; - if (!(info->port.flags & ASYNC_INITIALIZED)) - return; - spin_lock_irqsave(&info->slock, flags); /* @@ -978,7 +963,7 @@ static void mxser_shutdown(struct tty_struct *tty) wake_up_interruptible(&info->port.delta_msr_wait); /* - * Free the IRQ, if necessary + * Free the xmit buffer, if necessary */ if (info->port.xmit_buf) { free_page((unsigned long) info->port.xmit_buf); @@ -988,10 +973,6 @@ static void mxser_shutdown(struct tty_struct *tty) info->IER = 0; outb(0x00, info->ioaddr + UART_IER); - if (tty->termios->c_cflag & HUPCL) - info->MCR &= ~(UART_MCR_DTR | UART_MCR_RTS); - outb(info->MCR, info->ioaddr + UART_MCR); - /* clear Rx/Tx FIFO's */ if (info->board->chip_flag) outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT | @@ -1004,9 +985,6 @@ static void mxser_shutdown(struct tty_struct *tty) /* read data port to reset things */ (void) inb(info->ioaddr + UART_RX); - set_bit(TTY_IO_ERROR, &tty->flags); - - info->port.flags &= ~ASYNC_INITIALIZED; if (info->board->chip_flag) SET_MOXA_MUST_NO_SOFTWARE_FLOW_CONTROL(info->ioaddr); @@ -1023,8 +1001,7 @@ static void mxser_shutdown(struct tty_struct *tty) static int mxser_open(struct tty_struct *tty, struct file *filp) { struct mxser_port *info; - unsigned long flags; - int retval, line; + int line; line = tty->index; if (line == MXSER_PORTS) @@ -1035,23 +1012,7 @@ static int mxser_open(struct tty_struct *tty, struct file *filp) if (!info->ioaddr) return -ENODEV; - tty->driver_data = info; - tty_port_tty_set(&info->port, tty); - /* - * Start up serial port - */ - spin_lock_irqsave(&info->port.lock, flags); - info->port.count++; - spin_unlock_irqrestore(&info->port.lock, flags); - retval = mxser_startup(tty); - if (retval) - return retval; - - retval = tty_port_block_til_ready(&info->port, tty, filp); - if (retval) - return retval; - - return 0; + return tty_port_open(&info->port, tty, filp); } static void mxser_flush_buffer(struct tty_struct *tty) @@ -1075,19 +1036,11 @@ static void mxser_flush_buffer(struct tty_struct *tty) } -static void mxser_close_port(struct tty_struct *tty, struct tty_port *port) +static void mxser_close_port(struct tty_port *port) { struct mxser_port *info = container_of(port, struct mxser_port, port); unsigned long timeout; /* - * Save the termios structure, since this port may have - * separate termios for callout and dialin. - * - * FIXME: Can this go ? - */ - if (port->flags & ASYNC_NORMAL_ACTIVE) - info->normal_termios = *tty->termios; - /* * At this point we stop accepting input. To do this, we * disable the receive line status interrupts, and tell the * interrupt driver to stop checking the data ready bit in the @@ -1097,22 +1050,18 @@ static void mxser_close_port(struct tty_struct *tty, struct tty_port *port) if (info->board->chip_flag) info->IER &= ~MOXA_MUST_RECV_ISR; - if (port->flags & ASYNC_INITIALIZED) { - outb(info->IER, info->ioaddr + UART_IER); - /* - * Before we drop DTR, make sure the UART transmitter - * has completely drained; this is especially - * important if there is a transmit FIFO! - */ - timeout = jiffies + HZ; - while (!(inb(info->ioaddr + UART_LSR) & UART_LSR_TEMT)) { - schedule_timeout_interruptible(5); - if (time_after(jiffies, timeout)) - break; - } + outb(info->IER, info->ioaddr + UART_IER); + /* + * Before we drop DTR, make sure the UART transmitter + * has completely drained; this is especially + * important if there is a transmit FIFO! + */ + timeout = jiffies + HZ; + while (!(inb(info->ioaddr + UART_LSR) & UART_LSR_TEMT)) { + schedule_timeout_interruptible(5); + if (time_after(jiffies, timeout)) + break; } - mxser_shutdown(tty); - } /* @@ -1130,8 +1079,12 @@ static void mxser_close(struct tty_struct *tty, struct file *filp) return; if (tty_port_close_start(port, tty, filp) == 0) return; - mxser_close_port(tty, port); + mutex_lock(&port->mutex); + mxser_close_port(port); mxser_flush_buffer(tty); + mxser_shutdown_port(port); + clear_bit(ASYNCB_INITIALIZED, &port->flags); + mutex_unlock(&port->mutex); /* Right now the tty_port set is done outside of the close_end helper as we don't yet have everyone using refcounts */ tty_port_close_end(port, tty); @@ -1275,6 +1228,7 @@ static int mxser_set_serial_info(struct tty_struct *tty, struct serial_struct __user *new_info) { struct mxser_port *info = tty->driver_data; + struct tty_port *port = &info->port; struct serial_struct new_serial; speed_t baud; unsigned long sl_flags; @@ -1290,7 +1244,7 @@ static int mxser_set_serial_info(struct tty_struct *tty, new_serial.port != info->ioaddr) return -EINVAL; - flags = info->port.flags & ASYNC_SPD_MASK; + flags = port->flags & ASYNC_SPD_MASK; if (!capable(CAP_SYS_ADMIN)) { if ((new_serial.baud_base != info->baud_base) || @@ -1304,16 +1258,17 @@ static int mxser_set_serial_info(struct tty_struct *tty, * OK, past this point, all the error checking has been done. * At this point, we start making changes..... */ - info->port.flags = ((info->port.flags & ~ASYNC_FLAGS) | + port->flags = ((port->flags & ~ASYNC_FLAGS) | (new_serial.flags & ASYNC_FLAGS)); - info->port.close_delay = new_serial.close_delay * HZ / 100; - info->port.closing_wait = new_serial.closing_wait * HZ / 100; - tty->low_latency = (info->port.flags & ASYNC_LOW_LATENCY) - ? 1 : 0; - if ((info->port.flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST && + port->close_delay = new_serial.close_delay * HZ / 100; + port->closing_wait = new_serial.closing_wait * HZ / 100; + tty->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0; + if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST && (new_serial.baud_base != info->baud_base || new_serial.custom_divisor != info->custom_divisor)) { + if (new_serial.custom_divisor == 0) + return -EINVAL; baud = new_serial.baud_base / new_serial.custom_divisor; tty_encode_baud_rate(tty, baud, baud); } @@ -1323,15 +1278,17 @@ static int mxser_set_serial_info(struct tty_struct *tty, process_txrx_fifo(info); - if (info->port.flags & ASYNC_INITIALIZED) { - if (flags != (info->port.flags & ASYNC_SPD_MASK)) { + if (test_bit(ASYNCB_INITIALIZED, &port->flags)) { + if (flags != (port->flags & ASYNC_SPD_MASK)) { spin_lock_irqsave(&info->slock, sl_flags); mxser_change_speed(tty, NULL); spin_unlock_irqrestore(&info->slock, sl_flags); } - } else - retval = mxser_startup(tty); - + } else { + retval = mxser_activate(port, tty); + if (retval == 0) + set_bit(ASYNCB_INITIALIZED, &port->flags); + } return retval; } @@ -1520,7 +1477,8 @@ static int __init mxser_read_register(int port, unsigned short *regs) static int mxser_ioctl_special(unsigned int cmd, void __user *argp) { - struct mxser_port *port; + struct mxser_port *ip; + struct tty_port *port; struct tty_struct *tty; int result, status; unsigned int i, j; @@ -1536,38 +1494,39 @@ static int mxser_ioctl_special(unsigned int cmd, void __user *argp) case MOXA_CHKPORTENABLE: result = 0; - lock_kernel(); for (i = 0; i < MXSER_BOARDS; i++) for (j = 0; j < MXSER_PORTS_PER_BOARD; j++) if (mxser_boards[i].ports[j].ioaddr) result |= (1 << i); - unlock_kernel(); return put_user(result, (unsigned long __user *)argp); case MOXA_GETDATACOUNT: - lock_kernel(); + /* The receive side is locked by port->slock but it isn't + clear that an exact snapshot is worth copying here */ if (copy_to_user(argp, &mxvar_log, sizeof(mxvar_log))) ret = -EFAULT; - unlock_kernel(); return ret; case MOXA_GETMSTATUS: { struct mxser_mstatus ms, __user *msu = argp; - lock_kernel(); for (i = 0; i < MXSER_BOARDS; i++) for (j = 0; j < MXSER_PORTS_PER_BOARD; j++) { - port = &mxser_boards[i].ports[j]; + ip = &mxser_boards[i].ports[j]; + port = &ip->port; memset(&ms, 0, sizeof(ms)); - if (!port->ioaddr) + mutex_lock(&port->mutex); + if (!ip->ioaddr) goto copy; - tty = tty_port_tty_get(&port->port); + tty = tty_port_tty_get(port); if (!tty || !tty->termios) - ms.cflag = port->normal_termios.c_cflag; + ms.cflag = ip->normal_termios.c_cflag; else ms.cflag = tty->termios->c_cflag; tty_kref_put(tty); - status = inb(port->ioaddr + UART_MSR); + spin_lock_irq(&ip->slock); + status = inb(ip->ioaddr + UART_MSR); + spin_unlock_irq(&ip->slock); if (status & UART_MSR_DCD) ms.dcd = 1; if (status & UART_MSR_DSR) @@ -1575,13 +1534,11 @@ static int mxser_ioctl_special(unsigned int cmd, void __user *argp) if (status & UART_MSR_CTS) ms.cts = 1; copy: - if (copy_to_user(msu, &ms, sizeof(ms))) { - unlock_kernel(); + mutex_unlock(&port->mutex); + if (copy_to_user(msu, &ms, sizeof(ms))) return -EFAULT; - } msu++; } - unlock_kernel(); return 0; } case MOXA_ASPP_MON_EXT: { @@ -1593,41 +1550,48 @@ static int mxser_ioctl_special(unsigned int cmd, void __user *argp) if (!me) return -ENOMEM; - lock_kernel(); for (i = 0, p = 0; i < MXSER_BOARDS; i++) { for (j = 0; j < MXSER_PORTS_PER_BOARD; j++, p++) { if (p >= ARRAY_SIZE(me->rx_cnt)) { i = MXSER_BOARDS; break; } - port = &mxser_boards[i].ports[j]; - if (!port->ioaddr) + ip = &mxser_boards[i].ports[j]; + port = &ip->port; + + mutex_lock(&port->mutex); + if (!ip->ioaddr) { + mutex_unlock(&port->mutex); continue; + } - status = mxser_get_msr(port->ioaddr, 0, p); + spin_lock_irq(&ip->slock); + status = mxser_get_msr(ip->ioaddr, 0, p); if (status & UART_MSR_TERI) - port->icount.rng++; + ip->icount.rng++; if (status & UART_MSR_DDSR) - port->icount.dsr++; + ip->icount.dsr++; if (status & UART_MSR_DDCD) - port->icount.dcd++; + ip->icount.dcd++; if (status & UART_MSR_DCTS) - port->icount.cts++; + ip->icount.cts++; - port->mon_data.modem_status = status; - me->rx_cnt[p] = port->mon_data.rxcnt; - me->tx_cnt[p] = port->mon_data.txcnt; - me->up_rxcnt[p] = port->mon_data.up_rxcnt; - me->up_txcnt[p] = port->mon_data.up_txcnt; + ip->mon_data.modem_status = status; + me->rx_cnt[p] = ip->mon_data.rxcnt; + me->tx_cnt[p] = ip->mon_data.txcnt; + me->up_rxcnt[p] = ip->mon_data.up_rxcnt; + me->up_txcnt[p] = ip->mon_data.up_txcnt; me->modem_status[p] = - port->mon_data.modem_status; - tty = tty_port_tty_get(&port->port); + ip->mon_data.modem_status; + spin_unlock_irq(&ip->slock); + + tty = tty_port_tty_get(&ip->port); if (!tty || !tty->termios) { - cflag = port->normal_termios.c_cflag; - iflag = port->normal_termios.c_iflag; - me->baudrate[p] = tty_termios_baud_rate(&port->normal_termios); + cflag = ip->normal_termios.c_cflag; + iflag = ip->normal_termios.c_iflag; + me->baudrate[p] = tty_termios_baud_rate(&ip->normal_termios); } else { cflag = tty->termios->c_cflag; iflag = tty->termios->c_iflag; @@ -1646,16 +1610,15 @@ static int mxser_ioctl_special(unsigned int cmd, void __user *argp) if (iflag & (IXON | IXOFF)) me->flowctrl[p] |= 0x0C; - if (port->type == PORT_16550A) + if (ip->type == PORT_16550A) me->fifo[p] = 1; - opmode = inb(port->opmode_ioaddr) >> - ((p % 4) * 2); + opmode = inb(ip->opmode_ioaddr)>>((p % 4) * 2); opmode &= OP_MODE_MASK; me->iftype[p] = opmode; + mutex_unlock(&port->mutex); } } - unlock_kernel(); if (copy_to_user(argp, me, sizeof(*me))) ret = -EFAULT; kfree(me); @@ -1692,6 +1655,7 @@ static int mxser_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg) { struct mxser_port *info = tty->driver_data; + struct tty_port *port = &info->port; struct async_icount cnow; unsigned long flags; void __user *argp = (void __user *)arg; @@ -1716,20 +1680,20 @@ static int mxser_ioctl(struct tty_struct *tty, struct file *file, opmode != RS422_MODE && opmode != RS485_4WIRE_MODE) return -EFAULT; - lock_kernel(); mask = ModeMask[p]; shiftbit = p * 2; + spin_lock_irq(&info->slock); val = inb(info->opmode_ioaddr); val &= mask; val |= (opmode << shiftbit); outb(val, info->opmode_ioaddr); - unlock_kernel(); + spin_unlock_irq(&info->slock); } else { - lock_kernel(); shiftbit = p * 2; + spin_lock_irq(&info->slock); opmode = inb(info->opmode_ioaddr) >> shiftbit; + spin_unlock_irq(&info->slock); opmode &= OP_MODE_MASK; - unlock_kernel(); if (put_user(opmode, (int __user *)argp)) return -EFAULT; } @@ -1742,14 +1706,14 @@ static int mxser_ioctl(struct tty_struct *tty, struct file *file, switch (cmd) { case TIOCGSERIAL: - lock_kernel(); + mutex_lock(&port->mutex); retval = mxser_get_serial_info(tty, argp); - unlock_kernel(); + mutex_unlock(&port->mutex); return retval; case TIOCSSERIAL: - lock_kernel(); + mutex_lock(&port->mutex); retval = mxser_set_serial_info(tty, argp); - unlock_kernel(); + mutex_unlock(&port->mutex); return retval; case TIOCSERGETLSR: /* Get line status register */ return mxser_get_lsr_info(info, argp); @@ -1795,31 +1759,33 @@ static int mxser_ioctl(struct tty_struct *tty, struct file *file, case MOXA_HighSpeedOn: return put_user(info->baud_base != 115200 ? 1 : 0, (int __user *)argp); case MOXA_SDS_RSTICOUNTER: - lock_kernel(); + spin_lock_irq(&info->slock); info->mon_data.rxcnt = 0; info->mon_data.txcnt = 0; - unlock_kernel(); + spin_unlock_irq(&info->slock); return 0; case MOXA_ASPP_OQUEUE:{ int len, lsr; - lock_kernel(); len = mxser_chars_in_buffer(tty); + spin_lock(&info->slock); lsr = inb(info->ioaddr + UART_LSR) & UART_LSR_THRE; + spin_unlock_irq(&info->slock); len += (lsr ? 0 : 1); - unlock_kernel(); return put_user(len, (int __user *)argp); } case MOXA_ASPP_MON: { int mcr, status; - lock_kernel(); + spin_lock(&info->slock); status = mxser_get_msr(info->ioaddr, 1, tty->index); mxser_check_modem_status(tty, info, status); mcr = inb(info->ioaddr + UART_MCR); + spin_unlock(&info->slock); + if (mcr & MOXA_MUST_MCR_XON_FLAG) info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFHOLD; else @@ -1834,7 +1800,7 @@ static int mxser_ioctl(struct tty_struct *tty, struct file *file, info->mon_data.hold_reason |= NPPI_NOTIFY_CTSHOLD; else info->mon_data.hold_reason &= ~NPPI_NOTIFY_CTSHOLD; - unlock_kernel(); + if (copy_to_user(argp, &info->mon_data, sizeof(struct mxser_mon))) return -EFAULT; @@ -1993,6 +1959,7 @@ static void mxser_wait_until_sent(struct tty_struct *tty, int timeout) { struct mxser_port *info = tty->driver_data; unsigned long orig_jiffies, char_time; + unsigned long flags; int lsr; if (info->type == PORT_UNKNOWN) @@ -2032,19 +1999,21 @@ static void mxser_wait_until_sent(struct tty_struct *tty, int timeout) timeout, char_time); printk("jiff=%lu...", jiffies); #endif - lock_kernel(); + spin_lock_irqsave(&info->slock, flags); while (!((lsr = inb(info->ioaddr + UART_LSR)) & UART_LSR_TEMT)) { #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT printk("lsr = %d (jiff=%lu)...", lsr, jiffies); #endif + spin_unlock_irqrestore(&info->slock, flags); schedule_timeout_interruptible(char_time); + spin_lock_irqsave(&info->slock, flags); if (signal_pending(current)) break; if (timeout && time_after(jiffies, orig_jiffies + timeout)) break; } + spin_unlock_irqrestore(&info->slock, flags); set_current_state(TASK_RUNNING); - unlock_kernel(); #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies); @@ -2059,7 +2028,6 @@ static void mxser_hangup(struct tty_struct *tty) struct mxser_port *info = tty->driver_data; mxser_flush_buffer(tty); - mxser_shutdown(tty); tty_port_hangup(&info->port); } @@ -2363,6 +2331,8 @@ static const struct tty_operations mxser_ops = { struct tty_port_operations mxser_port_ops = { .carrier_raised = mxser_carrier_raised, .dtr_rts = mxser_dtr_rts, + .activate = mxser_activate, + .shutdown = mxser_shutdown_port, }; /* diff --git a/drivers/char/pcmcia/ipwireless/tty.c b/drivers/char/pcmcia/ipwireless/tty.c index 674b3ab3587..2bb7874a689 100644 --- a/drivers/char/pcmcia/ipwireless/tty.c +++ b/drivers/char/pcmcia/ipwireless/tty.c @@ -603,7 +603,7 @@ void ipwireless_tty_free(struct ipw_tty *tty) } } -static struct tty_operations tty_ops = { +static const struct tty_operations tty_ops = { .open = ipw_open, .close = ipw_close, .hangup = ipw_hangup, diff --git a/drivers/char/pty.c b/drivers/char/pty.c index d86c0bc05c1..385c44b3034 100644 --- a/drivers/char/pty.c +++ b/drivers/char/pty.c @@ -659,7 +659,7 @@ static int __ptmx_open(struct inode *inode, struct file *filp) if (!retval) return 0; out1: - tty_release_dev(filp); + tty_release(inode, filp); return retval; out: devpts_kill_index(inode, index); diff --git a/drivers/char/riscom8.c b/drivers/char/riscom8.c index 3cfa22d469e..0a8d1e56c99 100644 --- a/drivers/char/riscom8.c +++ b/drivers/char/riscom8.c @@ -793,26 +793,21 @@ static void rc_change_speed(struct tty_struct *tty, struct riscom_board *bp, } /* Must be called with interrupts enabled */ -static int rc_setup_port(struct tty_struct *tty, struct riscom_board *bp, - struct riscom_port *port) +static int rc_activate_port(struct tty_port *port, struct tty_struct *tty) { + struct riscom_port *rp = container_of(port, struct riscom_port, port); + struct riscom_board *bp = port_Board(rp); unsigned long flags; - if (port->port.flags & ASYNC_INITIALIZED) - return 0; - - if (tty_port_alloc_xmit_buf(&port->port) < 0) + if (tty_port_alloc_xmit_buf(port) < 0) return -ENOMEM; spin_lock_irqsave(&riscom_lock, flags); clear_bit(TTY_IO_ERROR, &tty->flags); - if (port->port.count == 1) - bp->count++; - port->xmit_cnt = port->xmit_head = port->xmit_tail = 0; - rc_change_speed(tty, bp, port); - port->port.flags |= ASYNC_INITIALIZED; - + bp->count++; + rp->xmit_cnt = rp->xmit_head = rp->xmit_tail = 0; + rc_change_speed(tty, bp, rp); spin_unlock_irqrestore(&riscom_lock, flags); return 0; } @@ -821,9 +816,6 @@ static int rc_setup_port(struct tty_struct *tty, struct riscom_board *bp, static void rc_shutdown_port(struct tty_struct *tty, struct riscom_board *bp, struct riscom_port *port) { - if (!(port->port.flags & ASYNC_INITIALIZED)) - return; - #ifdef RC_REPORT_OVERRUN printk(KERN_INFO "rc%d: port %d: Total %ld overruns were detected.\n", board_No(bp), port_No(port), port->overrun); @@ -840,11 +832,6 @@ static void rc_shutdown_port(struct tty_struct *tty, } #endif tty_port_free_xmit_buf(&port->port); - if (C_HUPCL(tty)) { - /* Drop DTR */ - bp->DTR |= (1u << port_No(port)); - rc_out(bp, RC_DTR, bp->DTR); - } /* Select port */ rc_out(bp, CD180_CAR, port_No(port)); @@ -856,7 +843,6 @@ static void rc_shutdown_port(struct tty_struct *tty, rc_out(bp, CD180_IER, port->IER); set_bit(TTY_IO_ERROR, &tty->flags); - port->port.flags &= ~ASYNC_INITIALIZED; if (--bp->count < 0) { printk(KERN_INFO "rc%d: rc_shutdown_port: " @@ -889,6 +875,20 @@ static int carrier_raised(struct tty_port *port) return CD; } +static void dtr_rts(struct tty_port *port, int onoff) +{ + struct riscom_port *p = container_of(port, struct riscom_port, port); + struct riscom_board *bp = port_Board(p); + unsigned long flags; + + spin_lock_irqsave(&riscom_lock, flags); + bp->DTR &= ~(1u << port_No(p)); + if (onoff == 0) + bp->DTR |= (1u << port_No(p)); + rc_out(bp, RC_DTR, bp->DTR); + spin_unlock_irqrestore(&riscom_lock, flags); +} + static int rc_open(struct tty_struct *tty, struct file *filp) { int board; @@ -909,14 +909,7 @@ static int rc_open(struct tty_struct *tty, struct file *filp) if (error) return error; - port->port.count++; - tty->driver_data = port; - tty_port_tty_set(&port->port, tty); - - error = rc_setup_port(tty, bp, port); - if (error == 0) - error = tty_port_block_til_ready(&port->port, tty, filp); - return error; + return tty_port_open(&port->port, tty, filp); } static void rc_flush_buffer(struct tty_struct *tty) @@ -950,24 +943,23 @@ static void rc_close_port(struct tty_port *port) spin_lock_irqsave(&riscom_lock, flags); rp->IER &= ~IER_RXD; - if (port->flags & ASYNC_INITIALIZED) { - rp->IER &= ~IER_TXRDY; - rp->IER |= IER_TXEMPTY; - rc_out(bp, CD180_CAR, port_No(rp)); - rc_out(bp, CD180_IER, rp->IER); - /* - * Before we drop DTR, make sure the UART transmitter - * has completely drained; this is especially - * important if there is a transmit FIFO! - */ - timeout = jiffies + HZ; - while (rp->IER & IER_TXEMPTY) { - spin_unlock_irqrestore(&riscom_lock, flags); - msleep_interruptible(jiffies_to_msecs(rp->timeout)); - spin_lock_irqsave(&riscom_lock, flags); - if (time_after(jiffies, timeout)) - break; - } + + rp->IER &= ~IER_TXRDY; + rp->IER |= IER_TXEMPTY; + rc_out(bp, CD180_CAR, port_No(rp)); + rc_out(bp, CD180_IER, rp->IER); + /* + * Before we drop DTR, make sure the UART transmitter + * has completely drained; this is especially + * important if there is a transmit FIFO! + */ + timeout = jiffies + HZ; + while (rp->IER & IER_TXEMPTY) { + spin_unlock_irqrestore(&riscom_lock, flags); + msleep_interruptible(jiffies_to_msecs(rp->timeout)); + spin_lock_irqsave(&riscom_lock, flags); + if (time_after(jiffies, timeout)) + break; } rc_shutdown_port(port->tty, bp, rp); spin_unlock_irqrestore(&riscom_lock, flags); @@ -1354,7 +1346,6 @@ static void rc_hangup(struct tty_struct *tty) if (rc_paranoia_check(port, tty->name, "rc_hangup")) return; - rc_shutdown_port(tty, port_Board(port), port); tty_port_hangup(&port->port); } @@ -1401,7 +1392,9 @@ static const struct tty_operations riscom_ops = { static const struct tty_port_operations riscom_port_ops = { .carrier_raised = carrier_raised, + .dtr_rts = dtr_rts, .shutdown = rc_close_port, + .activate = rc_activate_port, }; diff --git a/drivers/char/stallion.c b/drivers/char/stallion.c index db6dcfa35ba..0e511d61f54 100644 --- a/drivers/char/stallion.c +++ b/drivers/char/stallion.c @@ -407,7 +407,7 @@ static unsigned int stl_baudrates[] = { * Declare all those functions in this driver! */ -static int stl_memioctl(struct inode *ip, struct file *fp, unsigned int cmd, unsigned long arg); +static long stl_memioctl(struct file *fp, unsigned int cmd, unsigned long arg); static int stl_brdinit(struct stlbrd *brdp); static int stl_getportstats(struct tty_struct *tty, struct stlport *portp, comstats_t __user *cp); static int stl_clrportstats(struct stlport *portp, comstats_t __user *cp); @@ -607,7 +607,7 @@ static unsigned int sc26198_baudtable[] = { */ static const struct file_operations stl_fsiomem = { .owner = THIS_MODULE, - .ioctl = stl_memioctl, + .unlocked_ioctl = stl_memioctl, }; static struct class *stallion_class; @@ -702,6 +702,24 @@ static struct stlbrd *stl_allocbrd(void) /*****************************************************************************/ +static int stl_activate(struct tty_port *port, struct tty_struct *tty) +{ + struct stlport *portp = container_of(port, struct stlport, port); + if (!portp->tx.buf) { + portp->tx.buf = kmalloc(STL_TXBUFSIZE, GFP_KERNEL); + if (!portp->tx.buf) + return -ENOMEM; + portp->tx.head = portp->tx.buf; + portp->tx.tail = portp->tx.buf; + } + stl_setport(portp, tty->termios); + portp->sigs = stl_getsignals(portp); + stl_setsignals(portp, 1, 1); + stl_enablerxtx(portp, 1, 1); + stl_startrxtx(portp, 1, 0); + return 0; +} + static int stl_open(struct tty_struct *tty, struct file *filp) { struct stlport *portp; @@ -737,32 +755,8 @@ static int stl_open(struct tty_struct *tty, struct file *filp) if (portp == NULL) return -ENODEV; port = &portp->port; + return tty_port_open(&portp->port, tty, filp); -/* - * On the first open of the device setup the port hardware, and - * initialize the per port data structure. - */ - tty_port_tty_set(port, tty); - tty->driver_data = portp; - port->count++; - - if ((port->flags & ASYNC_INITIALIZED) == 0) { - if (!portp->tx.buf) { - portp->tx.buf = kmalloc(STL_TXBUFSIZE, GFP_KERNEL); - if (!portp->tx.buf) - return -ENOMEM; - portp->tx.head = portp->tx.buf; - portp->tx.tail = portp->tx.buf; - } - stl_setport(portp, tty->termios); - portp->sigs = stl_getsignals(portp); - stl_setsignals(portp, 1, 1); - stl_enablerxtx(portp, 1, 1); - stl_startrxtx(portp, 1, 0); - clear_bit(TTY_IO_ERROR, &tty->flags); - port->flags |= ASYNC_INITIALIZED; - } - return tty_port_block_til_ready(port, tty, filp); } /*****************************************************************************/ @@ -826,38 +820,12 @@ static void stl_waituntilsent(struct tty_struct *tty, int timeout) /*****************************************************************************/ -static void stl_close(struct tty_struct *tty, struct file *filp) +static void stl_shutdown(struct tty_port *port) { - struct stlport *portp; - struct tty_port *port; - unsigned long flags; - - pr_debug("stl_close(tty=%p,filp=%p)\n", tty, filp); - - portp = tty->driver_data; - BUG_ON(portp == NULL); - - port = &portp->port; - - if (tty_port_close_start(port, tty, filp) == 0) - return; -/* - * May want to wait for any data to drain before closing. The BUSY - * flag keeps track of whether we are still sending or not - it is - * very accurate for the cd1400, not quite so for the sc26198. - * (The sc26198 has no "end-of-data" interrupt only empty FIFO) - */ - stl_waituntilsent(tty, (HZ / 2)); - - spin_lock_irqsave(&port->lock, flags); - portp->port.flags &= ~ASYNC_INITIALIZED; - spin_unlock_irqrestore(&port->lock, flags); - + struct stlport *portp = container_of(port, struct stlport, port); stl_disableintrs(portp); - if (tty->termios->c_cflag & HUPCL) - stl_setsignals(portp, 0, 0); stl_enablerxtx(portp, 0, 0); - stl_flushbuffer(tty); + stl_flush(portp); portp->istate = 0; if (portp->tx.buf != NULL) { kfree(portp->tx.buf); @@ -865,9 +833,16 @@ static void stl_close(struct tty_struct *tty, struct file *filp) portp->tx.head = NULL; portp->tx.tail = NULL; } +} + +static void stl_close(struct tty_struct *tty, struct file *filp) +{ + struct stlport*portp; + pr_debug("stl_close(tty=%p,filp=%p)\n", tty, filp); - tty_port_close_end(port, tty); - tty_port_tty_set(port, NULL); + portp = tty->driver_data; + BUG_ON(portp == NULL); + tty_port_close(&portp->port, tty, filp); } /*****************************************************************************/ @@ -1314,35 +1289,12 @@ static void stl_stop(struct tty_struct *tty) static void stl_hangup(struct tty_struct *tty) { - struct stlport *portp; - struct tty_port *port; - unsigned long flags; - + struct stlport *portp = tty->driver_data; pr_debug("stl_hangup(tty=%p)\n", tty); - portp = tty->driver_data; if (portp == NULL) return; - port = &portp->port; - - spin_lock_irqsave(&port->lock, flags); - port->flags &= ~ASYNC_INITIALIZED; - spin_unlock_irqrestore(&port->lock, flags); - - stl_disableintrs(portp); - if (tty->termios->c_cflag & HUPCL) - stl_setsignals(portp, 0, 0); - stl_enablerxtx(portp, 0, 0); - stl_flushbuffer(tty); - portp->istate = 0; - set_bit(TTY_IO_ERROR, &tty->flags); - if (portp->tx.buf != NULL) { - kfree(portp->tx.buf); - portp->tx.buf = NULL; - portp->tx.head = NULL; - portp->tx.tail = NULL; - } - tty_port_hangup(port); + tty_port_hangup(&portp->port); } /*****************************************************************************/ @@ -2486,18 +2438,19 @@ static int stl_getbrdstruct(struct stlbrd __user *arg) * collection. */ -static int stl_memioctl(struct inode *ip, struct file *fp, unsigned int cmd, unsigned long arg) +static long stl_memioctl(struct file *fp, unsigned int cmd, unsigned long arg) { int brdnr, rc; void __user *argp = (void __user *)arg; - pr_debug("stl_memioctl(ip=%p,fp=%p,cmd=%x,arg=%lx)\n", ip, fp, cmd,arg); + pr_debug("stl_memioctl(fp=%p,cmd=%x,arg=%lx)\n", fp, cmd,arg); - brdnr = iminor(ip); + brdnr = iminor(fp->f_dentry->d_inode); if (brdnr >= STL_MAXBRDS) return -ENODEV; rc = 0; + lock_kernel(); switch (cmd) { case COM_GETPORTSTATS: rc = stl_getportstats(NULL, NULL, argp); @@ -2518,7 +2471,7 @@ static int stl_memioctl(struct inode *ip, struct file *fp, unsigned int cmd, uns rc = -ENOIOCTLCMD; break; } - + unlock_kernel(); return rc; } @@ -2549,6 +2502,8 @@ static const struct tty_operations stl_ops = { static const struct tty_port_operations stl_port_ops = { .carrier_raised = stl_carrier_raised, .dtr_rts = stl_dtr_rts, + .activate = stl_activate, + .shutdown = stl_shutdown, }; /*****************************************************************************/ diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c index 59499ee0fe6..684f0e0b175 100644 --- a/drivers/char/tty_io.c +++ b/drivers/char/tty_io.c @@ -142,7 +142,6 @@ ssize_t redirected_tty_write(struct file *, const char __user *, size_t, loff_t *); static unsigned int tty_poll(struct file *, poll_table *); static int tty_open(struct inode *, struct file *); -static int tty_release(struct inode *, struct file *); long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg); #ifdef CONFIG_COMPAT static long tty_compat_ioctl(struct file *file, unsigned int cmd, @@ -506,8 +505,6 @@ static void do_tty_hangup(struct work_struct *work) if (!tty) return; - /* inuse_filps is protected by the single kernel lock */ - lock_kernel(); spin_lock(&redirect_lock); if (redirect && redirect->private_data == tty) { @@ -516,7 +513,11 @@ static void do_tty_hangup(struct work_struct *work) } spin_unlock(&redirect_lock); + /* inuse_filps is protected by the single kernel lock */ + lock_kernel(); check_tty_count(tty, "do_tty_hangup"); + unlock_kernel(); + file_list_lock(); /* This breaks for file handles being sent over AF_UNIX sockets ? */ list_for_each_entry(filp, &tty->tty_files, f_u.fu_list) { @@ -530,6 +531,7 @@ static void do_tty_hangup(struct work_struct *work) } file_list_unlock(); + lock_kernel(); tty_ldisc_hangup(tty); read_lock(&tasklist_lock); @@ -708,6 +710,8 @@ void disassociate_ctty(int on_exit) struct tty_struct *tty; struct pid *tty_pgrp = NULL; + if (!current->signal->leader) + return; tty = get_current_tty(); if (tty) { @@ -773,8 +777,7 @@ void no_tty(void) { struct task_struct *tsk = current; lock_kernel(); - if (tsk->signal->leader) - disassociate_ctty(0); + disassociate_ctty(0); unlock_kernel(); proc_clear_tty(tsk); } @@ -1017,14 +1020,16 @@ out: void tty_write_message(struct tty_struct *tty, char *msg) { - lock_kernel(); if (tty) { mutex_lock(&tty->atomic_write_lock); - if (tty->ops->write && !test_bit(TTY_CLOSING, &tty->flags)) + lock_kernel(); + if (tty->ops->write && !test_bit(TTY_CLOSING, &tty->flags)) { + unlock_kernel(); tty->ops->write(tty, msg, strlen(msg)); + } else + unlock_kernel(); tty_write_unlock(tty); } - unlock_kernel(); return; } @@ -1202,14 +1207,21 @@ static int tty_driver_install_tty(struct tty_driver *driver, struct tty_struct *tty) { int idx = tty->index; + int ret; - if (driver->ops->install) - return driver->ops->install(driver, tty); + if (driver->ops->install) { + lock_kernel(); + ret = driver->ops->install(driver, tty); + unlock_kernel(); + return ret; + } if (tty_init_termios(tty) == 0) { + lock_kernel(); tty_driver_kref_get(driver); tty->count++; driver->ttys[idx] = tty; + unlock_kernel(); return 0; } return -ENOMEM; @@ -1302,10 +1314,14 @@ struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx, struct tty_struct *tty; int retval; + lock_kernel(); /* Check if pty master is being opened multiple times */ if (driver->subtype == PTY_TYPE_MASTER && - (driver->flags & TTY_DRIVER_DEVPTS_MEM) && !first_ok) + (driver->flags & TTY_DRIVER_DEVPTS_MEM) && !first_ok) { + unlock_kernel(); return ERR_PTR(-EIO); + } + unlock_kernel(); /* * First time open is complex, especially for PTY devices. @@ -1335,7 +1351,6 @@ struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx, * If we fail here just call release_tty to clean up. No need * to decrement the use counts, as release_tty doesn't care. */ - retval = tty_ldisc_setup(tty, tty->link); if (retval) goto release_mem_out; @@ -1350,7 +1365,9 @@ release_mem_out: if (printk_ratelimit()) printk(KERN_INFO "tty_init_dev: ldisc open failed, " "clearing slot %d\n", idx); + lock_kernel(); release_tty(tty, idx); + unlock_kernel(); return ERR_PTR(retval); } @@ -1464,7 +1481,17 @@ static void release_tty(struct tty_struct *tty, int idx) tty_kref_put(tty); } -/* +/** + * tty_release - vfs callback for close + * @inode: inode of tty + * @filp: file pointer for handle to tty + * + * Called the last time each file handle is closed that references + * this tty. There may however be several such references. + * + * Locking: + * Takes bkl. See tty_release_dev + * * Even releasing the tty structures is a tricky business.. We have * to be very careful that the structures are all released at the * same time, as interrupts might otherwise get the wrong pointers. @@ -1472,20 +1499,20 @@ static void release_tty(struct tty_struct *tty, int idx) * WSH 09/09/97: rewritten to avoid some nasty race conditions that could * lead to double frees or releasing memory still in use. */ -void tty_release_dev(struct file *filp) + +int tty_release(struct inode *inode, struct file *filp) { struct tty_struct *tty, *o_tty; int pty_master, tty_closing, o_tty_closing, do_sleep; int devpts; int idx; char buf[64]; - struct inode *inode; - inode = filp->f_path.dentry->d_inode; tty = (struct tty_struct *)filp->private_data; if (tty_paranoia_check(tty, inode, "tty_release_dev")) - return; + return 0; + lock_kernel(); check_tty_count(tty, "tty_release_dev"); tty_fasync(-1, filp, 0); @@ -1500,19 +1527,22 @@ void tty_release_dev(struct file *filp) if (idx < 0 || idx >= tty->driver->num) { printk(KERN_DEBUG "tty_release_dev: bad idx when trying to " "free (%s)\n", tty->name); - return; + unlock_kernel(); + return 0; } if (!devpts) { if (tty != tty->driver->ttys[idx]) { + unlock_kernel(); printk(KERN_DEBUG "tty_release_dev: driver.table[%d] not tty " "for (%s)\n", idx, tty->name); - return; + return 0; } if (tty->termios != tty->driver->termios[idx]) { + unlock_kernel(); printk(KERN_DEBUG "tty_release_dev: driver.termios[%d] not termios " "for (%s)\n", idx, tty->name); - return; + return 0; } } #endif @@ -1526,26 +1556,30 @@ void tty_release_dev(struct file *filp) if (tty->driver->other && !(tty->driver->flags & TTY_DRIVER_DEVPTS_MEM)) { if (o_tty != tty->driver->other->ttys[idx]) { + unlock_kernel(); printk(KERN_DEBUG "tty_release_dev: other->table[%d] " "not o_tty for (%s)\n", idx, tty->name); - return; + return 0 ; } if (o_tty->termios != tty->driver->other->termios[idx]) { + unlock_kernel(); printk(KERN_DEBUG "tty_release_dev: other->termios[%d] " "not o_termios for (%s)\n", idx, tty->name); - return; + return 0; } if (o_tty->link != tty) { + unlock_kernel(); printk(KERN_DEBUG "tty_release_dev: bad pty pointers\n"); - return; + return 0; } } #endif if (tty->ops->close) tty->ops->close(tty, filp); + unlock_kernel(); /* * Sanity check: if tty->count is going to zero, there shouldn't be * any waiters on tty->read_wait or tty->write_wait. We test the @@ -1568,6 +1602,7 @@ void tty_release_dev(struct file *filp) opens on /dev/tty */ mutex_lock(&tty_mutex); + lock_kernel(); tty_closing = tty->count <= 1; o_tty_closing = o_tty && (o_tty->count <= (pty_master ? 1 : 0)); @@ -1598,6 +1633,7 @@ void tty_release_dev(struct file *filp) printk(KERN_WARNING "tty_release_dev: %s: read/write wait queue " "active!\n", tty_name(tty, buf)); + unlock_kernel(); mutex_unlock(&tty_mutex); schedule(); } @@ -1661,8 +1697,10 @@ void tty_release_dev(struct file *filp) mutex_unlock(&tty_mutex); /* check whether both sides are closing ... */ - if (!tty_closing || (o_tty && !o_tty_closing)) - return; + if (!tty_closing || (o_tty && !o_tty_closing)) { + unlock_kernel(); + return 0; + } #ifdef TTY_DEBUG_HANGUP printk(KERN_DEBUG "freeing tty structure..."); @@ -1680,10 +1718,12 @@ void tty_release_dev(struct file *filp) /* Make this pty number available for reallocation */ if (devpts) devpts_kill_index(inode, idx); + unlock_kernel(); + return 0; } /** - * __tty_open - open a tty device + * tty_open - open a tty device * @inode: inode of device file * @filp: file pointer to tty * @@ -1703,7 +1743,7 @@ void tty_release_dev(struct file *filp) * ->siglock protects ->signal/->sighand */ -static int __tty_open(struct inode *inode, struct file *filp) +static int tty_open(struct inode *inode, struct file *filp) { struct tty_struct *tty = NULL; int noctty, retval; @@ -1720,10 +1760,12 @@ retry_open: retval = 0; mutex_lock(&tty_mutex); + lock_kernel(); if (device == MKDEV(TTYAUX_MAJOR, 0)) { tty = get_current_tty(); if (!tty) { + unlock_kernel(); mutex_unlock(&tty_mutex); return -ENXIO; } @@ -1755,12 +1797,14 @@ retry_open: goto got_driver; } } + unlock_kernel(); mutex_unlock(&tty_mutex); return -ENODEV; } driver = get_tty_driver(device, &index); if (!driver) { + unlock_kernel(); mutex_unlock(&tty_mutex); return -ENODEV; } @@ -1770,6 +1814,7 @@ got_driver: tty = tty_driver_lookup_tty(driver, inode, index); if (IS_ERR(tty)) { + unlock_kernel(); mutex_unlock(&tty_mutex); return PTR_ERR(tty); } @@ -1784,8 +1829,10 @@ got_driver: mutex_unlock(&tty_mutex); tty_driver_kref_put(driver); - if (IS_ERR(tty)) + if (IS_ERR(tty)) { + unlock_kernel(); return PTR_ERR(tty); + } filp->private_data = tty; file_move(filp, &tty->tty_files); @@ -1813,11 +1860,15 @@ got_driver: printk(KERN_DEBUG "error %d in opening %s...", retval, tty->name); #endif - tty_release_dev(filp); - if (retval != -ERESTARTSYS) + tty_release(inode, filp); + if (retval != -ERESTARTSYS) { + unlock_kernel(); return retval; - if (signal_pending(current)) + } + if (signal_pending(current)) { + unlock_kernel(); return retval; + } schedule(); /* * Need to reset f_op in case a hangup happened. @@ -1826,8 +1877,11 @@ got_driver: filp->f_op = &tty_fops; goto retry_open; } + unlock_kernel(); + mutex_lock(&tty_mutex); + lock_kernel(); spin_lock_irq(¤t->sighand->siglock); if (!noctty && current->signal->leader && @@ -1835,43 +1889,12 @@ got_driver: tty->session == NULL) __proc_set_tty(current, tty); spin_unlock_irq(¤t->sighand->siglock); + unlock_kernel(); mutex_unlock(&tty_mutex); return 0; } -/* BKL pushdown: scary code avoidance wrapper */ -static int tty_open(struct inode *inode, struct file *filp) -{ - int ret; - - lock_kernel(); - ret = __tty_open(inode, filp); - unlock_kernel(); - return ret; -} - - - - -/** - * tty_release - vfs callback for close - * @inode: inode of tty - * @filp: file pointer for handle to tty - * - * Called the last time each file handle is closed that references - * this tty. There may however be several such references. - * - * Locking: - * Takes bkl. See tty_release_dev - */ -static int tty_release(struct inode *inode, struct file *filp) -{ - lock_kernel(); - tty_release_dev(filp); - unlock_kernel(); - return 0; -} /** * tty_poll - check tty status @@ -2317,9 +2340,7 @@ static int tiocsetd(struct tty_struct *tty, int __user *p) if (get_user(ldisc, p)) return -EFAULT; - lock_kernel(); ret = tty_set_ldisc(tty, ldisc); - unlock_kernel(); return ret; } diff --git a/drivers/char/tty_ldisc.c b/drivers/char/tty_ldisc.c index feb55075819..3f653f7d849 100644 --- a/drivers/char/tty_ldisc.c +++ b/drivers/char/tty_ldisc.c @@ -34,6 +34,8 @@ #include <linux/vt_kern.h> #include <linux/selection.h> +#include <linux/smp_lock.h> /* For the moment */ + #include <linux/kmod.h> #include <linux/nsproxy.h> @@ -443,8 +445,14 @@ static void tty_set_termios_ldisc(struct tty_struct *tty, int num) static int tty_ldisc_open(struct tty_struct *tty, struct tty_ldisc *ld) { WARN_ON(test_and_set_bit(TTY_LDISC_OPEN, &tty->flags)); - if (ld->ops->open) - return ld->ops->open(tty); + if (ld->ops->open) { + int ret; + /* BKL here locks verus a hangup event */ + lock_kernel(); + ret = ld->ops->open(tty); + unlock_kernel(); + return ret; + } return 0; } @@ -545,6 +553,7 @@ int tty_set_ldisc(struct tty_struct *tty, int ldisc) if (IS_ERR(new_ldisc)) return PTR_ERR(new_ldisc); + lock_kernel(); /* * We need to look at the tty locking here for pty/tty pairs * when both sides try to change in parallel. @@ -558,10 +567,12 @@ int tty_set_ldisc(struct tty_struct *tty, int ldisc) */ if (tty->ldisc->ops->num == ldisc) { + unlock_kernel(); tty_ldisc_put(new_ldisc); return 0; } + unlock_kernel(); /* * Problem: What do we do if this blocks ? * We could deadlock here @@ -582,6 +593,9 @@ int tty_set_ldisc(struct tty_struct *tty, int ldisc) test_bit(TTY_LDISC_CHANGING, &tty->flags) == 0); mutex_lock(&tty->ldisc_mutex); } + + lock_kernel(); + set_bit(TTY_LDISC_CHANGING, &tty->flags); /* @@ -592,6 +606,8 @@ int tty_set_ldisc(struct tty_struct *tty, int ldisc) tty->receive_room = 0; o_ldisc = tty->ldisc; + + unlock_kernel(); /* * Make sure we don't change while someone holds a * reference to the line discipline. The TTY_LDISC bit @@ -617,12 +633,14 @@ int tty_set_ldisc(struct tty_struct *tty, int ldisc) flush_scheduled_work(); mutex_lock(&tty->ldisc_mutex); + lock_kernel(); if (test_bit(TTY_HUPPED, &tty->flags)) { /* We were raced by the hangup method. It will have stomped the ldisc data and closed the ldisc down */ clear_bit(TTY_LDISC_CHANGING, &tty->flags); mutex_unlock(&tty->ldisc_mutex); tty_ldisc_put(new_ldisc); + unlock_kernel(); return -EIO; } @@ -664,6 +682,7 @@ int tty_set_ldisc(struct tty_struct *tty, int ldisc) if (o_work) schedule_delayed_work(&o_tty->buf.work, 1); mutex_unlock(&tty->ldisc_mutex); + unlock_kernel(); return retval; } diff --git a/drivers/char/tty_port.c b/drivers/char/tty_port.c index c63f3d33914..be492dd6643 100644 --- a/drivers/char/tty_port.c +++ b/drivers/char/tty_port.c @@ -25,19 +25,21 @@ void tty_port_init(struct tty_port *port) init_waitqueue_head(&port->close_wait); init_waitqueue_head(&port->delta_msr_wait); mutex_init(&port->mutex); + mutex_init(&port->buf_mutex); spin_lock_init(&port->lock); port->close_delay = (50 * HZ) / 100; port->closing_wait = (3000 * HZ) / 100; + kref_init(&port->kref); } EXPORT_SYMBOL(tty_port_init); int tty_port_alloc_xmit_buf(struct tty_port *port) { /* We may sleep in get_zeroed_page() */ - mutex_lock(&port->mutex); + mutex_lock(&port->buf_mutex); if (port->xmit_buf == NULL) port->xmit_buf = (unsigned char *)get_zeroed_page(GFP_KERNEL); - mutex_unlock(&port->mutex); + mutex_unlock(&port->buf_mutex); if (port->xmit_buf == NULL) return -ENOMEM; return 0; @@ -46,15 +48,32 @@ EXPORT_SYMBOL(tty_port_alloc_xmit_buf); void tty_port_free_xmit_buf(struct tty_port *port) { - mutex_lock(&port->mutex); + mutex_lock(&port->buf_mutex); if (port->xmit_buf != NULL) { free_page((unsigned long)port->xmit_buf); port->xmit_buf = NULL; } - mutex_unlock(&port->mutex); + mutex_unlock(&port->buf_mutex); } EXPORT_SYMBOL(tty_port_free_xmit_buf); +static void tty_port_destructor(struct kref *kref) +{ + struct tty_port *port = container_of(kref, struct tty_port, kref); + if (port->xmit_buf) + free_page((unsigned long)port->xmit_buf); + if (port->ops->destruct) + port->ops->destruct(port); + else + kfree(port); +} + +void tty_port_put(struct tty_port *port) +{ + if (port) + kref_put(&port->kref, tty_port_destructor); +} +EXPORT_SYMBOL(tty_port_put); /** * tty_port_tty_get - get a tty reference @@ -99,10 +118,11 @@ EXPORT_SYMBOL(tty_port_tty_set); static void tty_port_shutdown(struct tty_port *port) { + mutex_lock(&port->mutex); if (port->ops->shutdown && test_and_clear_bit(ASYNCB_INITIALIZED, &port->flags)) port->ops->shutdown(port); - + mutex_unlock(&port->mutex); } /** @@ -120,8 +140,10 @@ void tty_port_hangup(struct tty_port *port) spin_lock_irqsave(&port->lock, flags); port->count = 0; port->flags &= ~ASYNC_NORMAL_ACTIVE; - if (port->tty) + if (port->tty) { + set_bit(TTY_IO_ERROR, &port->tty->flags); tty_kref_put(port->tty); + } port->tty = NULL; spin_unlock_irqrestore(&port->lock, flags); wake_up_interruptible(&port->open_wait); @@ -198,7 +220,7 @@ EXPORT_SYMBOL(tty_port_lower_dtr_rts); * management of these lines. Note that the dtr/rts raise is done each * iteration as a hangup may have previously dropped them while we wait. */ - + int tty_port_block_til_ready(struct tty_port *port, struct tty_struct *tty, struct file *filp) { @@ -253,7 +275,8 @@ int tty_port_block_til_ready(struct tty_port *port, tty_port_raise_dtr_rts(port); prepare_to_wait(&port->open_wait, &wait, TASK_INTERRUPTIBLE); - /* Check for a hangup or uninitialised port. Return accordingly */ + /* Check for a hangup or uninitialised port. + Return accordingly */ if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)) { if (port->flags & ASYNC_HUP_NOTIFY) retval = -EAGAIN; @@ -285,11 +308,11 @@ int tty_port_block_til_ready(struct tty_port *port, port->flags |= ASYNC_NORMAL_ACTIVE; spin_unlock_irqrestore(&port->lock, flags); return retval; - } EXPORT_SYMBOL(tty_port_block_til_ready); -int tty_port_close_start(struct tty_port *port, struct tty_struct *tty, struct file *filp) +int tty_port_close_start(struct tty_port *port, + struct tty_struct *tty, struct file *filp) { unsigned long flags; @@ -299,7 +322,7 @@ int tty_port_close_start(struct tty_port *port, struct tty_struct *tty, struct f return 0; } - if( tty->count == 1 && port->count != 1) { + if (tty->count == 1 && port->count != 1) { printk(KERN_WARNING "tty_port_close_start: tty->count = 1 port count = %d.\n", port->count); @@ -331,12 +354,20 @@ int tty_port_close_start(struct tty_port *port, struct tty_struct *tty, struct f long timeout; if (bps > 1200) - timeout = max_t(long, (HZ * 10 * port->drain_delay) / bps, - HZ / 10); + timeout = max_t(long, + (HZ * 10 * port->drain_delay) / bps, HZ / 10); else timeout = 2 * HZ; schedule_timeout_interruptible(timeout); } + /* Flush the ldisc buffering */ + tty_ldisc_flush(tty); + + /* Drop DTR/RTS if HUPCL is set. This causes any attached modem to + hang up the line */ + if (tty->termios->c_cflag & HUPCL) + tty_port_lower_dtr_rts(port); + /* Don't call port->drop for the last reference. Callers will want to drop the last active reference in ->shutdown() or the tty shutdown path */ @@ -348,11 +379,6 @@ void tty_port_close_end(struct tty_port *port, struct tty_struct *tty) { unsigned long flags; - tty_ldisc_flush(tty); - - if (tty->termios->c_cflag & HUPCL) - tty_port_lower_dtr_rts(port); - spin_lock_irqsave(&port->lock, flags); tty->closing = 0; @@ -377,7 +403,42 @@ void tty_port_close(struct tty_port *port, struct tty_struct *tty, if (tty_port_close_start(port, tty, filp) == 0) return; tty_port_shutdown(port); + set_bit(TTY_IO_ERROR, &tty->flags); tty_port_close_end(port, tty); tty_port_tty_set(port, NULL); } EXPORT_SYMBOL(tty_port_close); + +int tty_port_open(struct tty_port *port, struct tty_struct *tty, + struct file *filp) +{ + spin_lock_irq(&port->lock); + if (!tty_hung_up_p(filp)) + ++port->count; + spin_unlock_irq(&port->lock); + tty_port_tty_set(port, tty); + + /* + * Do the device-specific open only if the hardware isn't + * already initialized. Serialize open and shutdown using the + * port mutex. + */ + + mutex_lock(&port->mutex); + + if (!test_bit(ASYNCB_INITIALIZED, &port->flags)) { + clear_bit(TTY_IO_ERROR, &tty->flags); + if (port->ops->activate) { + int retval = port->ops->activate(port, tty); + if (retval) { + mutex_unlock(&port->mutex); + return retval; + } + } + set_bit(ASYNCB_INITIALIZED, &port->flags); + } + mutex_unlock(&port->mutex); + return tty_port_block_til_ready(port, tty, filp); +} + +EXPORT_SYMBOL(tty_port_open); diff --git a/drivers/mmc/card/sdio_uart.c b/drivers/mmc/card/sdio_uart.c index b8e7c5ae981..f53755533e7 100644 --- a/drivers/mmc/card/sdio_uart.c +++ b/drivers/mmc/card/sdio_uart.c @@ -29,6 +29,7 @@ #include <linux/module.h> #include <linux/init.h> #include <linux/kernel.h> +#include <linux/sched.h> #include <linux/mutex.h> #include <linux/seq_file.h> #include <linux/serial_reg.h> @@ -73,11 +74,10 @@ struct uart_icount { }; struct sdio_uart_port { + struct tty_port port; struct kref kref; struct tty_struct *tty; unsigned int index; - unsigned int opened; - struct mutex open_lock; struct sdio_func *func; struct mutex func_lock; struct task_struct *in_sdio_uart_irq; @@ -87,6 +87,7 @@ struct sdio_uart_port { struct uart_icount icount; unsigned int uartclk; unsigned int mctrl; + unsigned int rx_mctrl; unsigned int read_status_mask; unsigned int ignore_status_mask; unsigned char x_char; @@ -102,7 +103,6 @@ static int sdio_uart_add_port(struct sdio_uart_port *port) int index, ret = -EBUSY; kref_init(&port->kref); - mutex_init(&port->open_lock); mutex_init(&port->func_lock); spin_lock_init(&port->write_lock); @@ -151,6 +151,7 @@ static void sdio_uart_port_put(struct sdio_uart_port *port) static void sdio_uart_port_remove(struct sdio_uart_port *port) { struct sdio_func *func; + struct tty_struct *tty; BUG_ON(sdio_uart_table[port->index] != port); @@ -165,15 +166,19 @@ static void sdio_uart_port_remove(struct sdio_uart_port *port) * give up on that port ASAP. * Beware: the lock ordering is critical. */ - mutex_lock(&port->open_lock); + mutex_lock(&port->port.mutex); mutex_lock(&port->func_lock); func = port->func; sdio_claim_host(func); port->func = NULL; mutex_unlock(&port->func_lock); - if (port->opened) - tty_hangup(port->tty); - mutex_unlock(&port->open_lock); + tty = tty_port_tty_get(&port->port); + /* tty_hangup is async so is this safe as is ?? */ + if (tty) { + tty_hangup(tty); + tty_kref_put(tty); + } + mutex_unlock(&port->port.mutex); sdio_release_irq(func); sdio_disable_func(func); sdio_release_host(func); @@ -217,6 +222,8 @@ static unsigned int sdio_uart_get_mctrl(struct sdio_uart_port *port) unsigned char status; unsigned int ret; + /* FIXME: What stops this losing the delta bits and breaking + sdio_uart_check_modem_status ? */ status = sdio_in(port, UART_MSR); ret = 0; @@ -391,7 +398,7 @@ static void sdio_uart_stop_rx(struct sdio_uart_port *port) static void sdio_uart_receive_chars(struct sdio_uart_port *port, unsigned int *status) { - struct tty_struct *tty = port->tty; + struct tty_struct *tty = tty_port_tty_get(&port->port); unsigned int ch, flag; int max_count = 256; @@ -428,24 +435,30 @@ static void sdio_uart_receive_chars(struct sdio_uart_port *port, } if ((*status & port->ignore_status_mask & ~UART_LSR_OE) == 0) - tty_insert_flip_char(tty, ch, flag); + if (tty) + tty_insert_flip_char(tty, ch, flag); /* * Overrun is special. Since it's reported immediately, * it doesn't affect the current character. */ if (*status & ~port->ignore_status_mask & UART_LSR_OE) - tty_insert_flip_char(tty, 0, TTY_OVERRUN); + if (tty) + tty_insert_flip_char(tty, 0, TTY_OVERRUN); *status = sdio_in(port, UART_LSR); } while ((*status & UART_LSR_DR) && (max_count-- > 0)); - tty_flip_buffer_push(tty); + if (tty) { + tty_flip_buffer_push(tty); + tty_kref_put(tty); + } } static void sdio_uart_transmit_chars(struct sdio_uart_port *port) { struct circ_buf *xmit = &port->xmit; int count; + struct tty_struct *tty; if (port->x_char) { sdio_out(port, UART_TX, port->x_char); @@ -453,8 +466,13 @@ static void sdio_uart_transmit_chars(struct sdio_uart_port *port) port->x_char = 0; return; } - if (circ_empty(xmit) || port->tty->stopped || port->tty->hw_stopped) { + + tty = tty_port_tty_get(&port->port); + + if (tty == NULL || circ_empty(xmit) || + tty->stopped || tty->hw_stopped) { sdio_uart_stop_tx(port); + tty_kref_put(tty); return; } @@ -468,15 +486,17 @@ static void sdio_uart_transmit_chars(struct sdio_uart_port *port) } while (--count > 0); if (circ_chars_pending(xmit) < WAKEUP_CHARS) - tty_wakeup(port->tty); + tty_wakeup(tty); if (circ_empty(xmit)) sdio_uart_stop_tx(port); + tty_kref_put(tty); } static void sdio_uart_check_modem_status(struct sdio_uart_port *port) { int status; + struct tty_struct *tty; status = sdio_in(port, UART_MSR); @@ -487,25 +507,39 @@ static void sdio_uart_check_modem_status(struct sdio_uart_port *port) port->icount.rng++; if (status & UART_MSR_DDSR) port->icount.dsr++; - if (status & UART_MSR_DDCD) + if (status & UART_MSR_DDCD) { port->icount.dcd++; + /* DCD raise - wake for open */ + if (status & UART_MSR_DCD) + wake_up_interruptible(&port->port.open_wait); + else { + /* DCD drop - hang up if tty attached */ + tty = tty_port_tty_get(&port->port); + if (tty) { + tty_hangup(tty); + tty_kref_put(tty); + } + } + } if (status & UART_MSR_DCTS) { port->icount.cts++; - if (port->tty->termios->c_cflag & CRTSCTS) { + tty = tty_port_tty_get(&port->port); + if (tty && (tty->termios->c_cflag & CRTSCTS)) { int cts = (status & UART_MSR_CTS); - if (port->tty->hw_stopped) { + if (tty->hw_stopped) { if (cts) { - port->tty->hw_stopped = 0; + tty->hw_stopped = 0; sdio_uart_start_tx(port); - tty_wakeup(port->tty); + tty_wakeup(tty); } } else { if (!cts) { - port->tty->hw_stopped = 1; + tty->hw_stopped = 1; sdio_uart_stop_tx(port); } } } + tty_kref_put(tty); } } @@ -542,8 +576,62 @@ static void sdio_uart_irq(struct sdio_func *func) port->in_sdio_uart_irq = NULL; } -static int sdio_uart_startup(struct sdio_uart_port *port) +static int uart_carrier_raised(struct tty_port *tport) +{ + struct sdio_uart_port *port = + container_of(tport, struct sdio_uart_port, port); + unsigned int ret = sdio_uart_claim_func(port); + if (ret) /* Missing hardware shoudn't block for carrier */ + return 1; + ret = sdio_uart_get_mctrl(port); + sdio_uart_release_func(port); + if (ret & TIOCM_CAR) + return 1; + return 0; +} + +/** + * uart_dtr_rts - port helper to set uart signals + * @tport: tty port to be updated + * @onoff: set to turn on DTR/RTS + * + * Called by the tty port helpers when the modem signals need to be + * adjusted during an open, close and hangup. + */ + +static void uart_dtr_rts(struct tty_port *tport, int onoff) +{ + struct sdio_uart_port *port = + container_of(tport, struct sdio_uart_port, port); + int ret = sdio_uart_claim_func(port); + if (ret) + return; + if (onoff == 0) + sdio_uart_clear_mctrl(port, TIOCM_DTR | TIOCM_RTS); + else + sdio_uart_set_mctrl(port, TIOCM_DTR | TIOCM_RTS); + sdio_uart_release_func(port); +} + +/** + * sdio_uart_activate - start up hardware + * @tport: tty port to activate + * @tty: tty bound to this port + * + * Activate a tty port. The port locking guarantees us this will be + * run exactly once per set of opens, and if successful will see the + * shutdown method run exactly once to match. Start up and shutdown are + * protected from each other by the internal locking and will not run + * at the same time even during a hangup event. + * + * If we successfully start up the port we take an extra kref as we + * will keep it around until shutdown when the kref is dropped. + */ + +static int sdio_uart_activate(struct tty_port *tport, struct tty_struct *tty) { + struct sdio_uart_port *port = + container_of(tport, struct sdio_uart_port, port); unsigned long page; int ret; @@ -551,7 +639,7 @@ static int sdio_uart_startup(struct sdio_uart_port *port) * Set the TTY IO error marker - we will only clear this * once we have successfully opened the port. */ - set_bit(TTY_IO_ERROR, &port->tty->flags); + set_bit(TTY_IO_ERROR, &tty->flags); /* Initialise and allocate the transmit buffer. */ page = __get_free_page(GFP_KERNEL); @@ -592,19 +680,19 @@ static int sdio_uart_startup(struct sdio_uart_port *port) */ sdio_out(port, UART_LCR, UART_LCR_WLEN8); - port->ier = UART_IER_RLSI | UART_IER_RDI | UART_IER_RTOIE | UART_IER_UUE; + port->ier = UART_IER_RLSI|UART_IER_RDI|UART_IER_RTOIE|UART_IER_UUE; port->mctrl = TIOCM_OUT2; - sdio_uart_change_speed(port, port->tty->termios, NULL); + sdio_uart_change_speed(port, tty->termios, NULL); - if (port->tty->termios->c_cflag & CBAUD) + if (tty->termios->c_cflag & CBAUD) sdio_uart_set_mctrl(port, TIOCM_RTS | TIOCM_DTR); - if (port->tty->termios->c_cflag & CRTSCTS) + if (tty->termios->c_cflag & CRTSCTS) if (!(sdio_uart_get_mctrl(port) & TIOCM_CTS)) - port->tty->hw_stopped = 1; + tty->hw_stopped = 1; - clear_bit(TTY_IO_ERROR, &port->tty->flags); + clear_bit(TTY_IO_ERROR, &tty->flags); /* Kick the IRQ handler once while we're still holding the host lock */ sdio_uart_irq(port->func); @@ -621,8 +709,20 @@ err1: return ret; } -static void sdio_uart_shutdown(struct sdio_uart_port *port) +/** + * sdio_uart_shutdown - stop hardware + * @tport: tty port to shut down + * + * Deactivate a tty port. The port locking guarantees us this will be + * run only if a successful matching activate already ran. The two are + * protected from each other by the internal locking and will not run + * at the same time even during a hangup event. + */ + +static void sdio_uart_shutdown(struct tty_port *tport) { + struct sdio_uart_port *port = + container_of(tport, struct sdio_uart_port, port); int ret; ret = sdio_uart_claim_func(port); @@ -631,12 +731,6 @@ static void sdio_uart_shutdown(struct sdio_uart_port *port) sdio_uart_stop_rx(port); - /* TODO: wait here for TX FIFO to drain */ - - /* Turn off DTR and RTS early. */ - if (port->tty->termios->c_cflag & HUPCL) - sdio_uart_clear_mctrl(port, TIOCM_DTR | TIOCM_RTS); - /* Disable interrupts from this port */ sdio_release_irq(port->func); port->ier = 0; @@ -661,77 +755,70 @@ skip: free_page((unsigned long)port->xmit.buf); } -static int sdio_uart_open(struct tty_struct *tty, struct file *filp) +/** + * sdio_uart_install - install method + * @driver: the driver in use (sdio_uart in our case) + * @tty: the tty being bound + * + * Look up and bind the tty and the driver together. Initialize + * any needed private data (in our case the termios) + */ + +static int sdio_uart_install(struct tty_driver *driver, struct tty_struct *tty) { - struct sdio_uart_port *port; - int ret; + int idx = tty->index; + struct sdio_uart_port *port = sdio_uart_port_get(idx); + int ret = tty_init_termios(tty); + + if (ret == 0) { + tty_driver_kref_get(driver); + tty->count++; + /* This is the ref sdio_uart_port get provided */ + tty->driver_data = port; + driver->ttys[idx] = tty; + } else + sdio_uart_port_put(port); + return ret; +} - port = sdio_uart_port_get(tty->index); - if (!port) - return -ENODEV; +/** + * sdio_uart_cleanup - called on the last tty kref drop + * @tty: the tty being destroyed + * + * Called asynchronously when the last reference to the tty is dropped. + * We cannot destroy the tty->driver_data port kref until this point + */ - mutex_lock(&port->open_lock); +static void sdio_uart_cleanup(struct tty_struct *tty) +{ + struct sdio_uart_port *port = tty->driver_data; + tty->driver_data = NULL; /* Bug trap */ + sdio_uart_port_put(port); +} - /* - * Make sure not to mess up with a dead port - * which has not been closed yet. - */ - if (tty->driver_data && tty->driver_data != port) { - mutex_unlock(&port->open_lock); - sdio_uart_port_put(port); - return -EBUSY; - } +/* + * Open/close/hangup is now entirely boilerplate + */ - if (!port->opened) { - tty->driver_data = port; - port->tty = tty; - ret = sdio_uart_startup(port); - if (ret) { - tty->driver_data = NULL; - port->tty = NULL; - mutex_unlock(&port->open_lock); - sdio_uart_port_put(port); - return ret; - } - } - port->opened++; - mutex_unlock(&port->open_lock); - return 0; +static int sdio_uart_open(struct tty_struct *tty, struct file *filp) +{ + struct sdio_uart_port *port = tty->driver_data; + return tty_port_open(&port->port, tty, filp); } static void sdio_uart_close(struct tty_struct *tty, struct file * filp) { struct sdio_uart_port *port = tty->driver_data; + tty_port_close(&port->port, tty, filp); +} - if (!port) - return; - - mutex_lock(&port->open_lock); - BUG_ON(!port->opened); - - /* - * This is messy. The tty layer calls us even when open() - * returned an error. Ignore this close request if tty->count - * is larger than port->count. - */ - if (tty->count > port->opened) { - mutex_unlock(&port->open_lock); - return; - } - - if (--port->opened == 0) { - tty->closing = 1; - sdio_uart_shutdown(port); - tty_ldisc_flush(tty); - port->tty = NULL; - tty->driver_data = NULL; - tty->closing = 0; - } - mutex_unlock(&port->open_lock); - sdio_uart_port_put(port); +static void sdio_uart_hangup(struct tty_struct *tty) +{ + struct sdio_uart_port *port = tty->driver_data; + tty_port_hangup(&port->port); } -static int sdio_uart_write(struct tty_struct * tty, const unsigned char *buf, +static int sdio_uart_write(struct tty_struct *tty, const unsigned char *buf, int count) { struct sdio_uart_port *port = tty->driver_data; @@ -756,7 +843,7 @@ static int sdio_uart_write(struct tty_struct * tty, const unsigned char *buf, } spin_unlock(&port->write_lock); - if ( !(port->ier & UART_IER_THRI)) { + if (!(port->ier & UART_IER_THRI)) { int err = sdio_uart_claim_func(port); if (!err) { sdio_uart_start_tx(port); @@ -843,17 +930,12 @@ static void sdio_uart_unthrottle(struct tty_struct *tty) sdio_uart_release_func(port); } -static void sdio_uart_set_termios(struct tty_struct *tty, struct ktermios *old_termios) +static void sdio_uart_set_termios(struct tty_struct *tty, + struct ktermios *old_termios) { struct sdio_uart_port *port = tty->driver_data; unsigned int cflag = tty->termios->c_cflag; -#define RELEVANT_IFLAG(iflag) ((iflag) & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK)) - - if ((cflag ^ old_termios->c_cflag) == 0 && - RELEVANT_IFLAG(tty->termios->c_iflag ^ old_termios->c_iflag) == 0) - return; - if (sdio_uart_claim_func(port) != 0) return; @@ -928,7 +1010,7 @@ static int sdio_uart_tiocmset(struct tty_struct *tty, struct file *file, int result; result = sdio_uart_claim_func(port); - if(!result) { + if (!result) { sdio_uart_update_mctrl(port, set, clear); sdio_uart_release_func(port); } @@ -946,7 +1028,7 @@ static int sdio_uart_proc_show(struct seq_file *m, void *v) struct sdio_uart_port *port = sdio_uart_port_get(i); if (port) { seq_printf(m, "%d: uart:SDIO", i); - if(capable(CAP_SYS_ADMIN)) { + if (capable(CAP_SYS_ADMIN)) { seq_printf(m, " tx:%d rx:%d", port->icount.tx, port->icount.rx); if (port->icount.frame) @@ -994,6 +1076,13 @@ static const struct file_operations sdio_uart_proc_fops = { .release = single_release, }; +static const struct tty_port_operations sdio_uart_port_ops = { + .dtr_rts = uart_dtr_rts, + .carrier_raised = uart_carrier_raised, + .shutdown = sdio_uart_shutdown, + .activate = sdio_uart_activate, +}; + static const struct tty_operations sdio_uart_ops = { .open = sdio_uart_open, .close = sdio_uart_close, @@ -1004,9 +1093,12 @@ static const struct tty_operations sdio_uart_ops = { .throttle = sdio_uart_throttle, .unthrottle = sdio_uart_unthrottle, .set_termios = sdio_uart_set_termios, + .hangup = sdio_uart_hangup, .break_ctl = sdio_uart_break_ctl, .tiocmget = sdio_uart_tiocmget, .tiocmset = sdio_uart_tiocmset, + .install = sdio_uart_install, + .cleanup = sdio_uart_cleanup, .proc_fops = &sdio_uart_proc_fops, }; @@ -1043,7 +1135,7 @@ static int sdio_uart_probe(struct sdio_func *func, } if (!tpl) { printk(KERN_WARNING - "%s: can't find tuple 0x91 subtuple 0 (SUBTPL_SIOREG) for GPS class\n", + "%s: can't find tuple 0x91 subtuple 0 (SUBTPL_SIOREG) for GPS class\n", sdio_func_id(func)); kfree(port); return -EINVAL; @@ -1068,13 +1160,16 @@ static int sdio_uart_probe(struct sdio_func *func, port->func = func; sdio_set_drvdata(func, port); + tty_port_init(&port->port); + port->port.ops = &sdio_uart_port_ops; ret = sdio_uart_add_port(port); if (ret) { kfree(port); } else { struct device *dev; - dev = tty_register_device(sdio_uart_tty_driver, port->index, &func->dev); + dev = tty_register_device(sdio_uart_tty_driver, + port->index, &func->dev); if (IS_ERR(dev)) { sdio_uart_port_remove(port); ret = PTR_ERR(dev); diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c index 737b4c96097..c3e37c8e7e2 100644 --- a/drivers/serial/8250.c +++ b/drivers/serial/8250.c @@ -1339,14 +1339,12 @@ static void serial8250_start_tx(struct uart_port *port) serial_out(up, UART_IER, up->ier); if (up->bugs & UART_BUG_TXEN) { - unsigned char lsr, iir; + unsigned char lsr; lsr = serial_in(up, UART_LSR); up->lsr_saved_flags |= lsr & LSR_SAVE_FLAGS; - iir = serial_in(up, UART_IIR) & 0x0f; if ((up->port.type == PORT_RM9000) ? - (lsr & UART_LSR_THRE && - (iir == UART_IIR_NO_INT || iir == UART_IIR_THRI)) : - (lsr & UART_LSR_TEMT && iir & UART_IIR_NO_INT)) + (lsr & UART_LSR_THRE) : + (lsr & UART_LSR_TEMT)) transmit_chars(up); } } @@ -2646,7 +2644,7 @@ static void __init serial8250_isa_init_ports(void) { struct uart_8250_port *up; static int first = 1; - int i; + int i, irqflag = 0; if (!first) return; @@ -2670,6 +2668,9 @@ static void __init serial8250_isa_init_ports(void) up->port.ops = &serial8250_pops; } + if (share_irqs) + irqflag = IRQF_SHARED; + for (i = 0, up = serial8250_ports; i < ARRAY_SIZE(old_serial_port) && i < nr_uarts; i++, up++) { @@ -2683,8 +2684,7 @@ static void __init serial8250_isa_init_ports(void) up->port.iotype = old_serial_port[i].io_type; up->port.regshift = old_serial_port[i].iomem_reg_shift; set_io_from_upio(&up->port); - if (share_irqs) - up->port.irqflags |= IRQF_SHARED; + up->port.irqflags |= irqflag; } } @@ -2940,10 +2940,13 @@ static int __devinit serial8250_probe(struct platform_device *dev) { struct plat_serial8250_port *p = dev->dev.platform_data; struct uart_port port; - int ret, i; + int ret, i, irqflag = 0; memset(&port, 0, sizeof(struct uart_port)); + if (share_irqs) + irqflag = IRQF_SHARED; + for (i = 0; p && p->flags != 0; p++, i++) { port.iobase = p->iobase; port.membase = p->membase; @@ -2960,8 +2963,7 @@ static int __devinit serial8250_probe(struct platform_device *dev) port.serial_in = p->serial_in; port.serial_out = p->serial_out; port.dev = &dev->dev; - if (share_irqs) - port.irqflags |= IRQF_SHARED; + port.irqflags |= irqflag; ret = serial8250_register_port(&port); if (ret < 0) { dev_err(&dev->dev, "unable to register port at index %d " diff --git a/drivers/serial/jsm/jsm.h b/drivers/serial/jsm/jsm.h index 4e5f3bde046..38a509c684c 100644 --- a/drivers/serial/jsm/jsm.h +++ b/drivers/serial/jsm/jsm.h @@ -138,7 +138,6 @@ struct jsm_board u32 nasync; /* Number of ports on card */ u32 irq; /* Interrupt request number */ - u64 intr_count; /* Count of interrupts */ u64 membase; /* Start of base memory of the card */ u64 membase_end; /* End of base memory of the card */ @@ -206,8 +205,6 @@ struct jsm_channel { u64 ch_close_delay; /* How long we should drop RTS/DTR for */ - u64 ch_cpstime; /* Time for CPS calculations */ - tcflag_t ch_c_iflag; /* channel iflags */ tcflag_t ch_c_cflag; /* channel cflags */ tcflag_t ch_c_oflag; /* channel oflags */ @@ -215,11 +212,6 @@ struct jsm_channel { u8 ch_stopc; /* Stop character */ u8 ch_startc; /* Start character */ - u32 ch_old_baud; /* Cache of the current baud */ - u32 ch_custom_speed;/* Custom baud, if set */ - - u32 ch_wopen; /* Waiting for open process cnt */ - u8 ch_mostat; /* FEP output modem status */ u8 ch_mistat; /* FEP input modem status */ diff --git a/drivers/serial/jsm/jsm_driver.c b/drivers/serial/jsm/jsm_driver.c index b3604aa322a..108c3e0471f 100644 --- a/drivers/serial/jsm/jsm_driver.c +++ b/drivers/serial/jsm/jsm_driver.c @@ -48,6 +48,17 @@ struct uart_driver jsm_uart_driver = { .nr = NR_PORTS, }; +static pci_ers_result_t jsm_io_error_detected(struct pci_dev *pdev, + pci_channel_state_t state); +static pci_ers_result_t jsm_io_slot_reset(struct pci_dev *pdev); +static void jsm_io_resume(struct pci_dev *pdev); + +static struct pci_error_handlers jsm_err_handler = { + .error_detected = jsm_io_error_detected, + .slot_reset = jsm_io_slot_reset, + .resume = jsm_io_resume, +}; + int jsm_debug; module_param(jsm_debug, int, 0); MODULE_PARM_DESC(jsm_debug, "Driver debugging level"); @@ -123,7 +134,7 @@ static int __devinit jsm_probe_one(struct pci_dev *pdev, const struct pci_device } rc = request_irq(brd->irq, brd->bd_ops->intr, - IRQF_DISABLED|IRQF_SHARED, "JSM", brd); + IRQF_SHARED, "JSM", brd); if (rc) { printk(KERN_WARNING "Failed to hook IRQ %d\n",brd->irq); goto out_iounmap; @@ -164,6 +175,7 @@ static int __devinit jsm_probe_one(struct pci_dev *pdev, const struct pci_device } pci_set_drvdata(pdev, brd); + pci_save_state(pdev); return 0; out_free_irq: @@ -222,8 +234,42 @@ static struct pci_driver jsm_driver = { .id_table = jsm_pci_tbl, .probe = jsm_probe_one, .remove = __devexit_p(jsm_remove_one), + .err_handler = &jsm_err_handler, }; +static pci_ers_result_t jsm_io_error_detected(struct pci_dev *pdev, + pci_channel_state_t state) +{ + struct jsm_board *brd = pci_get_drvdata(pdev); + + jsm_remove_uart_port(brd); + + return PCI_ERS_RESULT_NEED_RESET; +} + +static pci_ers_result_t jsm_io_slot_reset(struct pci_dev *pdev) +{ + int rc; + + rc = pci_enable_device(pdev); + + if (rc) + return PCI_ERS_RESULT_DISCONNECT; + + pci_set_master(pdev); + + return PCI_ERS_RESULT_RECOVERED; +} + +static void jsm_io_resume(struct pci_dev *pdev) +{ + struct jsm_board *brd = pci_get_drvdata(pdev); + + pci_restore_state(pdev); + + jsm_uart_port_init(brd); +} + static int __init jsm_init_module(void) { int rc; diff --git a/drivers/serial/jsm/jsm_neo.c b/drivers/serial/jsm/jsm_neo.c index b4b124e4828..7960d9633c1 100644 --- a/drivers/serial/jsm/jsm_neo.c +++ b/drivers/serial/jsm/jsm_neo.c @@ -954,13 +954,8 @@ static void neo_param(struct jsm_channel *ch) ch->ch_flags |= (CH_BAUD0); ch->ch_mostat &= ~(UART_MCR_RTS | UART_MCR_DTR); neo_assert_modem_signals(ch); - ch->ch_old_baud = 0; return; - } else if (ch->ch_custom_speed) { - baud = ch->ch_custom_speed; - if (ch->ch_flags & CH_BAUD0) - ch->ch_flags &= ~(CH_BAUD0); } else { int i; unsigned int cflag; @@ -1045,7 +1040,6 @@ static void neo_param(struct jsm_channel *ch) quot = ch->ch_bd->bd_dividend / baud; if (quot != 0) { - ch->ch_old_baud = baud; writeb(UART_LCR_DLAB, &ch->ch_neo_uart->lcr); writeb((quot & 0xff), &ch->ch_neo_uart->txrx); writeb((quot >> 8), &ch->ch_neo_uart->ier); @@ -1123,8 +1117,6 @@ static irqreturn_t neo_intr(int irq, void *voidbrd) unsigned long lock_flags2; int outofloop_count = 0; - brd->intr_count++; - /* Lock out the slow poller from running on this board. */ spin_lock_irqsave(&brd->bd_intr_lock, lock_flags); diff --git a/drivers/serial/jsm/jsm_tty.c b/drivers/serial/jsm/jsm_tty.c index 7439c037362..cd95e215550 100644 --- a/drivers/serial/jsm/jsm_tty.c +++ b/drivers/serial/jsm/jsm_tty.c @@ -296,8 +296,6 @@ static void jsm_tty_close(struct uart_port *port) bd->bd_ops->assert_modem_signals(channel); } - channel->ch_old_baud = 0; - /* Turn off UART interrupts for this port */ channel->ch_bd->bd_ops->uart_off(channel); @@ -432,7 +430,7 @@ int __devinit jsm_tty_init(struct jsm_board *brd) return 0; } -int __devinit jsm_uart_port_init(struct jsm_board *brd) +int jsm_uart_port_init(struct jsm_board *brd) { int i; unsigned int line; @@ -472,7 +470,7 @@ int __devinit jsm_uart_port_init(struct jsm_board *brd) if (uart_add_one_port (&jsm_uart_driver, &brd->channels[i]->uart_port)) printk(KERN_INFO "jsm: add device failed\n"); else - printk(KERN_INFO "Added device \n"); + printk(KERN_INFO "jsm: Port %d added\n", i); } jsm_printk(INIT, INFO, &brd->pci_dev, "finish\n"); diff --git a/drivers/serial/pxa.c b/drivers/serial/pxa.c index b8629d74f6a..4a821046baa 100644 --- a/drivers/serial/pxa.c +++ b/drivers/serial/pxa.c @@ -438,6 +438,7 @@ serial_pxa_set_termios(struct uart_port *port, struct ktermios *termios, unsigned char cval, fcr = 0; unsigned long flags; unsigned int baud, quot; + unsigned int dll; switch (termios->c_cflag & CSIZE) { case CS5: @@ -534,10 +535,18 @@ serial_pxa_set_termios(struct uart_port *port, struct ktermios *termios, else up->mcr &= ~UART_MCR_AFE; - serial_out(up, UART_LCR, cval | UART_LCR_DLAB);/* set DLAB */ + serial_out(up, UART_LCR, cval | UART_LCR_DLAB); /* set DLAB */ serial_out(up, UART_DLL, quot & 0xff); /* LS of divisor */ + + /* + * work around Errata #75 according to Intel(R) PXA27x Processor Family + * Specification Update (Nov 2005) + */ + dll = serial_in(up, UART_DLL); + WARN_ON(dll != (quot & 0xff)); + serial_out(up, UART_DLM, quot >> 8); /* MS of divisor */ - serial_out(up, UART_LCR, cval); /* reset DLAB */ + serial_out(up, UART_LCR, cval); /* reset DLAB */ up->lcr = cval; /* Save LCR */ serial_pxa_set_mctrl(&up->port, up->port.mctrl); serial_out(up, UART_FCR, fcr); diff --git a/drivers/serial/serial_core.c b/drivers/serial/serial_core.c index dcc72444e8e..047530b285b 100644 --- a/drivers/serial/serial_core.c +++ b/drivers/serial/serial_core.c @@ -342,11 +342,11 @@ uart_get_baud_rate(struct uart_port *port, struct ktermios *termios, if (flags == UPF_SPD_HI) altbaud = 57600; - if (flags == UPF_SPD_VHI) + else if (flags == UPF_SPD_VHI) altbaud = 115200; - if (flags == UPF_SPD_SHI) + else if (flags == UPF_SPD_SHI) altbaud = 230400; - if (flags == UPF_SPD_WARP) + else if (flags == UPF_SPD_WARP) altbaud = 460800; for (try = 0; try < 2; try++) { @@ -1217,9 +1217,8 @@ static void uart_set_termios(struct tty_struct *tty, /* Handle transition to B0 status */ if ((old_termios->c_cflag & CBAUD) && !(cflag & CBAUD)) uart_clear_mctrl(state->uart_port, TIOCM_RTS | TIOCM_DTR); - /* Handle transition away from B0 status */ - if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) { + else if (!(old_termios->c_cflag & CBAUD) && (cflag & CBAUD)) { unsigned int mask = TIOCM_DTR; if (!(cflag & CRTSCTS) || !test_bit(TTY_THROTTLED, &tty->flags)) @@ -1234,9 +1233,8 @@ static void uart_set_termios(struct tty_struct *tty, __uart_start(tty); spin_unlock_irqrestore(&state->uart_port->lock, flags); } - /* Handle turning on CRTSCTS */ - if (!(old_termios->c_cflag & CRTSCTS) && (cflag & CRTSCTS)) { + else if (!(old_termios->c_cflag & CRTSCTS) && (cflag & CRTSCTS)) { spin_lock_irqsave(&state->uart_port->lock, flags); if (!(state->uart_port->ops->get_mctrl(state->uart_port) & TIOCM_CTS)) { tty->hw_stopped = 1; @@ -2344,7 +2342,7 @@ static const struct tty_operations uart_ops = { */ int uart_register_driver(struct uart_driver *drv) { - struct tty_driver *normal = NULL; + struct tty_driver *normal; int i, retval; BUG_ON(drv->state); @@ -2354,13 +2352,12 @@ int uart_register_driver(struct uart_driver *drv) * we have a large number of ports to handle. */ drv->state = kzalloc(sizeof(struct uart_state) * drv->nr, GFP_KERNEL); - retval = -ENOMEM; if (!drv->state) goto out; - normal = alloc_tty_driver(drv->nr); + normal = alloc_tty_driver(drv->nr); if (!normal) - goto out; + goto out_kfree; drv->tty_driver = normal; @@ -2393,12 +2390,14 @@ int uart_register_driver(struct uart_driver *drv) } retval = tty_register_driver(normal); - out: - if (retval < 0) { - put_tty_driver(normal); - kfree(drv->state); - } - return retval; + if (retval >= 0) + return retval; + + put_tty_driver(normal); +out_kfree: + kfree(drv->state); +out: + return -ENOMEM; } /** diff --git a/drivers/usb/serial/opticon.c b/drivers/usb/serial/opticon.c index 80f59b6350c..4cdb975caa8 100644 --- a/drivers/usb/serial/opticon.c +++ b/drivers/usb/serial/opticon.c @@ -501,12 +501,13 @@ static int opticon_resume(struct usb_interface *intf) struct usb_serial_port *port = serial->port[0]; int result; - mutex_lock(&port->mutex); - if (port->port.count) + mutex_lock(&port->port.mutex); + /* This is protected by the port mutex against close/open */ + if (test_bit(ASYNCB_INITIALIZED, &port->port.flags)) result = usb_submit_urb(priv->bulk_read_urb, GFP_NOIO); else result = 0; - mutex_unlock(&port->mutex); + mutex_unlock(&port->port.mutex); return result; } diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c index bd3fa7ff15b..4543f359be7 100644 --- a/drivers/usb/serial/usb-serial.c +++ b/drivers/usb/serial/usb-serial.c @@ -247,96 +247,66 @@ static int serial_install(struct tty_driver *driver, struct tty_struct *tty) return retval; } -static int serial_open(struct tty_struct *tty, struct file *filp) +static int serial_activate(struct tty_port *tport, struct tty_struct *tty) { - struct usb_serial_port *port = tty->driver_data; + struct usb_serial_port *port = + container_of(tport, struct usb_serial_port, port); struct usb_serial *serial = port->serial; int retval; - dbg("%s - port %d", __func__, port->number); - - spin_lock_irq(&port->port.lock); - if (!tty_hung_up_p(filp)) - ++port->port.count; - spin_unlock_irq(&port->port.lock); - tty_port_tty_set(&port->port, tty); + mutex_lock(&serial->disc_mutex); + if (serial->disconnected) + retval = -ENODEV; + else + retval = port->serial->type->open(tty, port); + mutex_unlock(&serial->disc_mutex); + return retval; +} - /* Do the device-specific open only if the hardware isn't - * already initialized. - */ - if (!test_bit(ASYNCB_INITIALIZED, &port->port.flags)) { - if (mutex_lock_interruptible(&port->mutex)) - return -ERESTARTSYS; - mutex_lock(&serial->disc_mutex); - if (serial->disconnected) - retval = -ENODEV; - else - retval = port->serial->type->open(tty, port); - mutex_unlock(&serial->disc_mutex); - mutex_unlock(&port->mutex); - if (retval) - return retval; - set_bit(ASYNCB_INITIALIZED, &port->port.flags); - } +static int serial_open(struct tty_struct *tty, struct file *filp) +{ + struct usb_serial_port *port = tty->driver_data; - /* Now do the correct tty layer semantics */ - retval = tty_port_block_til_ready(&port->port, tty, filp); - return retval; + dbg("%s - port %d", __func__, port->number); + return tty_port_open(&port->port, tty, filp); } /** * serial_down - shut down hardware - * @port: port to shut down + * @tport: tty port to shut down * * Shut down a USB serial port unless it is the console. We never - * shut down the console hardware as it will always be in use. + * shut down the console hardware as it will always be in use. Serialized + * against activate by the tport mutex and kept to matching open/close pairs + * of calls by the ASYNCB_INITIALIZED flag. */ -static void serial_down(struct usb_serial_port *port) +static void serial_down(struct tty_port *tport) { + struct usb_serial_port *port = + container_of(tport, struct usb_serial_port, port); struct usb_serial_driver *drv = port->serial->type; - /* * The console is magical. Do not hang up the console hardware * or there will be tears. */ if (port->console) return; - - /* Don't call the close method if the hardware hasn't been - * initialized. - */ - if (!test_and_clear_bit(ASYNCB_INITIALIZED, &port->port.flags)) - return; - - mutex_lock(&port->mutex); if (drv->close) drv->close(port); - mutex_unlock(&port->mutex); } static void serial_hangup(struct tty_struct *tty) { struct usb_serial_port *port = tty->driver_data; - dbg("%s - port %d", __func__, port->number); - - serial_down(port); tty_port_hangup(&port->port); } static void serial_close(struct tty_struct *tty, struct file *filp) { struct usb_serial_port *port = tty->driver_data; - dbg("%s - port %d", __func__, port->number); - - if (tty_hung_up_p(filp)) - return; - if (tty_port_close_start(&port->port, tty, filp) == 0) - return; - serial_down(port); - tty_port_close_end(&port->port, tty); - tty_port_tty_set(&port->port, NULL); + tty_port_close(&port->port, tty, filp); } /** @@ -725,6 +695,8 @@ static void serial_dtr_rts(struct tty_port *port, int on) static const struct tty_port_operations serial_port_ops = { .carrier_raised = serial_carrier_raised, .dtr_rts = serial_dtr_rts, + .activate = serial_activate, + .shutdown = serial_down, }; int usb_serial_probe(struct usb_interface *interface, @@ -923,7 +895,8 @@ int usb_serial_probe(struct usb_interface *interface, port->port.ops = &serial_port_ops; port->serial = serial; spin_lock_init(&port->lock); - mutex_init(&port->mutex); + /* Keep this for private driver use for the moment but + should probably go away */ INIT_WORK(&port->work, usb_serial_port_work); serial->port[i] = port; port->dev.parent = &interface->dev; diff --git a/fs/devpts/inode.c b/fs/devpts/inode.c index d5f8c96964b..8882ecc0f1b 100644 --- a/fs/devpts/inode.c +++ b/fs/devpts/inode.c @@ -517,11 +517,23 @@ int devpts_pty_new(struct inode *ptmx_inode, struct tty_struct *tty) struct tty_struct *devpts_get_tty(struct inode *pts_inode, int number) { + struct dentry *dentry; + struct tty_struct *tty; + BUG_ON(pts_inode->i_rdev == MKDEV(TTYAUX_MAJOR, PTMX_MINOR)); + /* Ensure dentry has not been deleted by devpts_pty_kill() */ + dentry = d_find_alias(pts_inode); + if (!dentry) + return NULL; + + tty = NULL; if (pts_inode->i_sb->s_magic == DEVPTS_SUPER_MAGIC) - return (struct tty_struct *)pts_inode->i_private; - return NULL; + tty = (struct tty_struct *)pts_inode->i_private; + + dput(dentry); + + return tty; } void devpts_pty_kill(struct tty_struct *tty) diff --git a/include/linux/Kbuild b/include/linux/Kbuild index 5a5385749e1..f72914db2a1 100644 --- a/include/linux/Kbuild +++ b/include/linux/Kbuild @@ -214,7 +214,6 @@ unifdef-y += futex.h unifdef-y += fs.h unifdef-y += gameport.h unifdef-y += generic_serial.h -unifdef-y += hayesesp.h unifdef-y += hdlcdrv.h unifdef-y += hdlc.h unifdef-y += hdreg.h diff --git a/include/linux/hayesesp.h b/include/linux/hayesesp.h deleted file mode 100644 index 92b08cfe4a7..00000000000 --- a/include/linux/hayesesp.h +++ /dev/null @@ -1,114 +0,0 @@ -#ifndef HAYESESP_H -#define HAYESESP_H - -struct hayes_esp_config { - short flow_on; - short flow_off; - short rx_trigger; - short tx_trigger; - short pio_threshold; - unsigned char rx_timeout; - char dma_channel; -}; - -#ifdef __KERNEL__ - -#define ESP_DMA_CHANNEL 0 -#define ESP_RX_TRIGGER 768 -#define ESP_TX_TRIGGER 768 -#define ESP_FLOW_OFF 1016 -#define ESP_FLOW_ON 944 -#define ESP_RX_TMOUT 128 -#define ESP_PIO_THRESHOLD 32 - -#define ESP_IN_MAJOR 57 /* major dev # for dial in */ -#define ESP_OUT_MAJOR 58 /* major dev # for dial out */ -#define ESPC_SCALE 3 -#define UART_ESI_BASE 0x00 -#define UART_ESI_SID 0x01 -#define UART_ESI_RX 0x02 -#define UART_ESI_TX 0x02 -#define UART_ESI_CMD1 0x04 -#define UART_ESI_CMD2 0x05 -#define UART_ESI_STAT1 0x04 -#define UART_ESI_STAT2 0x05 -#define UART_ESI_RWS 0x07 - -#define UART_IER_DMA_TMOUT 0x80 -#define UART_IER_DMA_TC 0x08 - -#define ESI_SET_IRQ 0x04 -#define ESI_SET_DMA_TMOUT 0x05 -#define ESI_SET_SRV_MASK 0x06 -#define ESI_SET_ERR_MASK 0x07 -#define ESI_SET_FLOW_CNTL 0x08 -#define ESI_SET_FLOW_CHARS 0x09 -#define ESI_SET_FLOW_LVL 0x0a -#define ESI_SET_TRIGGER 0x0b -#define ESI_SET_RX_TIMEOUT 0x0c -#define ESI_SET_FLOW_TMOUT 0x0d -#define ESI_WRITE_UART 0x0e -#define ESI_READ_UART 0x0f -#define ESI_SET_MODE 0x10 -#define ESI_GET_ERR_STAT 0x12 -#define ESI_GET_UART_STAT 0x13 -#define ESI_GET_RX_AVAIL 0x14 -#define ESI_GET_TX_AVAIL 0x15 -#define ESI_START_DMA_RX 0x16 -#define ESI_START_DMA_TX 0x17 -#define ESI_ISSUE_BREAK 0x1a -#define ESI_FLUSH_RX 0x1b -#define ESI_FLUSH_TX 0x1c -#define ESI_SET_BAUD 0x1d -#define ESI_SET_ENH_IRQ 0x1f -#define ESI_SET_REINTR 0x20 -#define ESI_SET_PRESCALAR 0x23 -#define ESI_NO_COMMAND 0xff - -#define ESP_STAT_RX_TIMEOUT 0x01 -#define ESP_STAT_DMA_RX 0x02 -#define ESP_STAT_DMA_TX 0x04 -#define ESP_STAT_NEVER_DMA 0x08 -#define ESP_STAT_USE_PIO 0x10 - -#define ESP_MAGIC 0x53ee -#define ESP_XMIT_SIZE 4096 - -struct esp_struct { - int magic; - struct tty_port port; - spinlock_t lock; - int io_port; - int irq; - int read_status_mask; - int ignore_status_mask; - int timeout; - int stat_flags; - int custom_divisor; - int close_delay; - unsigned short closing_wait; - unsigned short closing_wait2; - int IER; /* Interrupt Enable Register */ - int MCR; /* Modem control register */ - unsigned long last_active; - int line; - unsigned char *xmit_buf; - int xmit_head; - int xmit_tail; - int xmit_cnt; - wait_queue_head_t break_wait; - struct async_icount icount; /* kernel counters for the 4 input interrupts */ - struct hayes_esp_config config; /* port configuration */ - struct esp_struct *next_port; /* For the linked list */ -}; - -struct esp_pio_buffer { - unsigned char data[1024]; - struct esp_pio_buffer *next; -}; - -#endif /* __KERNEL__ */ - - -#endif /* ESP_H */ - diff --git a/include/linux/isicom.h b/include/linux/isicom.h index bbd42197298..b92e0565063 100644 --- a/include/linux/isicom.h +++ b/include/linux/isicom.h @@ -67,6 +67,7 @@ #define FIRMWARE_LOADED 0x0001 #define BOARD_ACTIVE 0x0002 +#define BOARD_INIT 0x0004 /* isi_port status bitmap */ diff --git a/include/linux/tty.h b/include/linux/tty.h index f0f43d08d8b..405a9035fe4 100644 --- a/include/linux/tty.h +++ b/include/linux/tty.h @@ -190,9 +190,17 @@ struct tty_port_operations { /* Control the DTR line */ void (*dtr_rts)(struct tty_port *port, int raise); /* Called when the last close completes or a hangup finishes - IFF the port was initialized. Do not use to free resources */ + IFF the port was initialized. Do not use to free resources. Called + under the port mutex to serialize against activate/shutdowns */ void (*shutdown)(struct tty_port *port); void (*drop)(struct tty_port *port); + /* Called under the port mutex from tty_port_open, serialized using + the port mutex */ + /* FIXME: long term getting the tty argument *out* of this would be + good for consoles */ + int (*activate)(struct tty_port *port, struct tty_struct *tty); + /* Called on the final put of a port */ + void (*destruct)(struct tty_port *port); }; struct tty_port { @@ -206,12 +214,14 @@ struct tty_port { wait_queue_head_t delta_msr_wait; /* Modem status change */ unsigned long flags; /* TTY flags ASY_*/ struct mutex mutex; /* Locking */ + struct mutex buf_mutex; /* Buffer alloc lock */ unsigned char *xmit_buf; /* Optional buffer */ unsigned int close_delay; /* Close port delay */ unsigned int closing_wait; /* Delay for output */ int drain_delay; /* Set to zero if no pure time based drain is needed else set to size of fifo */ + struct kref kref; /* Ref counter */ }; /* @@ -439,7 +449,7 @@ extern void initialize_tty_struct(struct tty_struct *tty, struct tty_driver *driver, int idx); extern struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx, int first_ok); -extern void tty_release_dev(struct file *filp); +extern int tty_release(struct inode *inode, struct file *filp); extern int tty_init_termios(struct tty_struct *tty); extern struct tty_struct *tty_pair_get_tty(struct tty_struct *tty); @@ -454,6 +464,15 @@ extern int tty_write_lock(struct tty_struct *tty, int ndelay); extern void tty_port_init(struct tty_port *port); extern int tty_port_alloc_xmit_buf(struct tty_port *port); extern void tty_port_free_xmit_buf(struct tty_port *port); +extern void tty_port_put(struct tty_port *port); + +extern inline struct tty_port *tty_port_get(struct tty_port *port) +{ + if (port) + kref_get(&port->kref); + return port; +} + extern struct tty_struct *tty_port_tty_get(struct tty_port *port); extern void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty); extern int tty_port_carrier_raised(struct tty_port *port); @@ -467,6 +486,8 @@ extern int tty_port_close_start(struct tty_port *port, extern void tty_port_close_end(struct tty_port *port, struct tty_struct *tty); extern void tty_port_close(struct tty_port *port, struct tty_struct *tty, struct file *filp); +extern int tty_port_open(struct tty_port *port, + struct tty_struct *tty, struct file *filp); extern inline int tty_port_users(struct tty_port *port) { return port->count + port->blocked_open; diff --git a/include/linux/usb/serial.h b/include/linux/usb/serial.h index ce911ebf91e..acf6e457c04 100644 --- a/include/linux/usb/serial.h +++ b/include/linux/usb/serial.h @@ -39,8 +39,6 @@ enum port_dev_state { * @serial: pointer back to the struct usb_serial owner of this port. * @port: pointer to the corresponding tty_port for this port. * @lock: spinlock to grab when updating portions of this structure. - * @mutex: mutex used to synchronize serial_open() and serial_close() - * access for this port. * @number: the number of the port (the minor number). * @interrupt_in_buffer: pointer to the interrupt in buffer for this port. * @interrupt_in_urb: pointer to the interrupt in struct urb for this port. @@ -77,7 +75,6 @@ struct usb_serial_port { struct usb_serial *serial; struct tty_port port; spinlock_t lock; - struct mutex mutex; unsigned char number; unsigned char *interrupt_in_buffer; diff --git a/kernel/exit.c b/kernel/exit.c index 1143012951e..6f50ef55a6f 100644 --- a/kernel/exit.c +++ b/kernel/exit.c @@ -971,7 +971,7 @@ NORET_TYPE void do_exit(long code) exit_thread(); cgroup_exit(tsk, 1); - if (group_dead && tsk->signal->leader) + if (group_dead) disassociate_ctty(1); module_put(task_thread_info(tsk)->exec_domain->module); |