diff options
Diffstat (limited to 'drivers/serial')
| -rw-r--r-- | drivers/serial/Kconfig | 2 | ||||
| -rw-r--r-- | drivers/serial/bfin_5xx.c | 105 |
2 files changed, 106 insertions, 1 deletions
diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig index 315ea991645..71a4ac53a7e 100644 --- a/drivers/serial/Kconfig +++ b/drivers/serial/Kconfig @@ -556,7 +556,7 @@ choice config SERIAL_BFIN_DMA bool "DMA mode" - depends on DMA_UNCACHED_1M + depends on DMA_UNCACHED_1M && !KGDB_UART help This driver works under DMA mode. If this option is selected, the blackfin simple dma driver is also enabled. diff --git a/drivers/serial/bfin_5xx.c b/drivers/serial/bfin_5xx.c index 22569bd5d82..f7926dc7fa7 100644 --- a/drivers/serial/bfin_5xx.c +++ b/drivers/serial/bfin_5xx.c @@ -41,6 +41,11 @@ #include <linux/tty_flip.h> #include <linux/serial_core.h> +#ifdef CONFIG_KGDB_UART +#include <linux/kgdb.h> +#include <asm/irq_regs.h> +#endif + #include <asm/gpio.h> #include <asm/mach/bfin_serial_5xx.h> @@ -119,6 +124,9 @@ static void bfin_serial_stop_rx(struct uart_port *port) unsigned short ier; ier = UART_GET_IER(uart); +#ifdef CONFIG_KGDB_UART + if (uart->port.line != CONFIG_KGDB_UART_PORT) +#endif ier &= ~ERBFI; UART_PUT_IER(uart, ier); } @@ -130,6 +138,49 @@ static void bfin_serial_enable_ms(struct uart_port *port) { } +#ifdef CONFIG_KGDB_UART +static int kgdb_entry_state; + +void kgdb_put_debug_char(int chr) +{ + struct bfin_serial_port *uart; + + if (CONFIG_KGDB_UART_PORT<0 || CONFIG_KGDB_UART_PORT>=NR_PORTS) + uart = &bfin_serial_ports[0]; + else + uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT]; + + while (!(UART_GET_LSR(uart) & THRE)) { + __builtin_bfin_ssync(); + } + UART_PUT_LCR(uart, UART_GET_LCR(uart)&(~DLAB)); + __builtin_bfin_ssync(); + UART_PUT_CHAR(uart, (unsigned char)chr); + __builtin_bfin_ssync(); +} + +int kgdb_get_debug_char(void) +{ + struct bfin_serial_port *uart; + unsigned char chr; + + if (CONFIG_KGDB_UART_PORT<0 || CONFIG_KGDB_UART_PORT>=NR_PORTS) + uart = &bfin_serial_ports[0]; + else + uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT]; + + while(!(UART_GET_LSR(uart) & DR)) { + __builtin_bfin_ssync(); + } + UART_PUT_LCR(uart, UART_GET_LCR(uart)&(~DLAB)); + __builtin_bfin_ssync(); + chr = UART_GET_CHAR(uart); + __builtin_bfin_ssync(); + + return chr; +} +#endif + #ifdef CONFIG_SERIAL_BFIN_PIO static void local_put_char(struct bfin_serial_port *uart, char ch) { @@ -152,6 +203,9 @@ static void bfin_serial_rx_chars(struct bfin_serial_port *uart) { struct tty_struct *tty = uart->port.info->tty; unsigned int status, ch, flg; +#ifdef CONFIG_KGDB_UART + struct pt_regs *regs = get_irq_regs(); +#endif #ifdef BF533_FAMILY static int in_break = 0; #endif @@ -160,6 +214,27 @@ static void bfin_serial_rx_chars(struct bfin_serial_port *uart) ch = UART_GET_CHAR(uart); uart->port.icount.rx++; +#ifdef CONFIG_KGDB_UART + if (uart->port.line == CONFIG_KGDB_UART_PORT) { + if (uart->port.cons->index == CONFIG_KGDB_UART_PORT && ch == 0x1) { /* Ctrl + A */ + kgdb_breakkey_pressed(regs); + return; + } else if (kgdb_entry_state == 0 && ch == '$') {/* connection from KGDB */ + kgdb_entry_state = 1; + } else if (kgdb_entry_state == 1 && ch == 'q') { + kgdb_entry_state = 0; + kgdb_breakkey_pressed(regs); + return; + } else if (ch == 0x3) {/* Ctrl + C */ + kgdb_entry_state = 0; + kgdb_breakkey_pressed(regs); + return; + } else { + kgdb_entry_state = 0; + } + } +#endif + #ifdef BF533_FAMILY /* The BF533 family of processors have a nice misbehavior where * they continuously generate characters for a "single" break. @@ -571,7 +646,11 @@ static int bfin_serial_startup(struct uart_port *port) uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES; add_timer(&(uart->rx_dma_timer)); #else +# ifdef CONFIG_KGDB_UART + if (uart->port.line != CONFIG_KGDB_UART_PORT && request_irq +# else if (request_irq +# endif (uart->port.irq, bfin_serial_rx_int, IRQF_DISABLED, "BFIN_UART_RX", uart)) { printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n"); @@ -601,6 +680,9 @@ static void bfin_serial_shutdown(struct uart_port *port) free_dma(uart->rx_dma_channel); del_timer(&(uart->rx_dma_timer)); #else +#ifdef CONFIG_KGDB_UART + if (uart->port.line != CONFIG_KGDB_UART_PORT) +#endif free_irq(uart->port.irq, uart); free_irq(uart->port.irq+1, uart); #endif @@ -931,6 +1013,10 @@ static int __init bfin_serial_rs_console_init(void) { bfin_serial_init_ports(); register_console(&bfin_serial_console); +#ifdef CONFIG_KGDB_UART + kgdb_entry_state = 0; + init_kgdb_uart(); +#endif return 0; } console_initcall(bfin_serial_rs_console_init); @@ -1023,6 +1109,10 @@ static struct platform_driver bfin_serial_driver = { static int __init bfin_serial_init(void) { int ret; +#ifdef CONFIG_KGDB_UART + struct bfin_serial_port *uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT]; + struct termios t; +#endif pr_info("Serial: Blackfin serial driver\n"); @@ -1036,6 +1126,21 @@ static int __init bfin_serial_init(void) uart_unregister_driver(&bfin_serial_reg); } } +#ifdef CONFIG_KGDB_UART + if (uart->port.cons->index != CONFIG_KGDB_UART_PORT) { + request_irq(uart->port.irq, bfin_serial_int, + IRQF_DISABLED, "BFIN_UART_RX", uart); + pr_info("Request irq for kgdb uart port\n"); + UART_PUT_IER(uart, UART_GET_IER(uart) | ERBFI); + __builtin_bfin_ssync(); + t.c_cflag = CS8|B57600; + t.c_iflag = 0; + t.c_oflag = 0; + t.c_lflag = ICANON; + t.c_line = CONFIG_KGDB_UART_PORT; + bfin_serial_set_termios(&uart->port, &t, &t); + } +#endif return ret; } |