/* Low-level parallel port routines for Archimedes onboard hardware * * Author: Phil Blundell <philb@gnu.org> */ /* This driver is for the parallel port hardware found on Acorn's old * range of Archimedes machines. The A5000 and newer systems have PC-style * I/O hardware and should use the parport_pc driver instead. * * The Acorn printer port hardware is very simple. There is a single 8-bit * write-only latch for the data port and control/status bits are handled * with various auxilliary input and output lines. The port is not * bidirectional, does not support any modes other than SPP, and has only * a subset of the standard printer control lines connected. */ #include <linux/threads.h> #include <linux/delay.h> #include <linux/errno.h> #include <linux/interrupt.h> #include <linux/ioport.h> #include <linux/kernel.h> #include <linux/slab.h> #include <linux/parport.h> #include <asm/ptrace.h> #include <asm/io.h> #include <asm/arch/oldlatches.h> #include <asm/arch/irqs.h> #define DATA_ADDRESS 0x3350010 /* This is equivalent to the above and only used for request_region. */ #define PORT_BASE 0x80000000 | ((DATA_ADDRESS - IO_BASE) >> 2) /* The hardware can't read from the data latch, so we must use a soft copy. */ static unsigned char data_copy; /* These are pretty simple. We know the irq is never shared and the kernel does all the magic that's required. */ static void arc_enable_irq(struct parport *p) { enable_irq(p->irq); } static void arc_disable_irq(struct parport *p) { disable_irq(p->irq); } static void arc_interrupt(int irq, void *dev_id, struct pt_regs *regs) { parport_generic_irq(irq, (struct parport *) dev_id, regs); } static void arc_write_data(struct parport *p, unsigned char data) { data_copy = data; outb_t(data, DATA_LATCH); } static unsigned char arc_read_data(struct parport *p) { return data_copy; } static struct parport_operations parport_arc_ops = { .write_data = arc_write_data, .read_data = arc_read_data, .write_control = arc_write_control, .read_control = arc_read_control, .frob_control = arc_frob_control, .read_status = arc_read_status, .enable_irq = arc_enable_irq, .disable_irq = arc_disable_irq, .data_forward = arc_data_forward, .data_reverse = arc_data_reverse, .init_state = arc_init_state, .save_state = arc_save_state, .restore_state = arc_restore_state, .epp_write_data = parport_ieee1284_epp_write_data, .epp_read_data = parport_ieee1284_epp_read_data, .epp_write_addr = parport_ieee1284_epp_write_addr, .epp_read_addr = parport_ieee1284_epp_read_addr, .ecp_write_data = parport_ieee1284_ecp_write_data, .ecp_read_data = parport_ieee1284_ecp_read_data, .ecp_write_addr = parport_ieee1284_ecp_write_addr, .compat_write_data = parport_ieee1284_write_compat, .nibble_read_data = parport_ieee1284_read_nibble, .byte_read_data = parport_ieee1284_read_byte, .owner = THIS_MODULE, }; /* --- Initialisation code -------------------------------- */ static int parport_arc_init(void) { /* Archimedes hardware provides only one port, at a fixed address */ struct parport *p; struct resource res; char *fake_name = "parport probe"); res = request_region(PORT_BASE, 1, fake_name); if (res == NULL) return 0; p = parport_register_port (PORT_BASE, IRQ_PRINTERACK, PARPORT_DMA_NONE, &parport_arc_ops); if (!p) { release_region(PORT_BASE, 1); return 0; } p->modes = PARPORT_MODE_ARCSPP; p->size = 1; rename_region(res, p->name); printk(KERN_INFO "%s: Archimedes on-board port, using irq %d\n", p->irq); /* Tell the high-level drivers about the port. */ parport_announce_port (p); return 1; } module_init(parport_arc_init)