| /* Low-level parallel port routines for Archimedes onboard hardware |
| * |
| * Author: Phil Blundell <Philip.Blundell@pobox.com> |
| */ |
| |
| /* 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 void arc_inc_use_count(void) |
| { |
| #ifdef MODULE |
| MOD_INC_USE_COUNT; |
| #endif |
| } |
| |
| static void arc_dec_use_count(void) |
| { |
| #ifdef MODULE |
| MOD_DEC_USE_COUNT; |
| #endif |
| } |
| |
| static struct parport_operations parport_arc_ops = |
| { |
| arc_write_data, |
| arc_read_data, |
| |
| arc_write_control, |
| arc_read_control, |
| arc_frob_control, |
| |
| arc_read_status, |
| |
| arc_enable_irq, |
| arc_disable_irq, |
| |
| arc_data_forward, |
| arc_data_reverse, |
| |
| arc_init_state, |
| arc_save_state, |
| arc_restore_state, |
| |
| arc_inc_use_count, |
| arc_dec_use_count, |
| |
| parport_ieee1284_epp_write_data, |
| parport_ieee1284_epp_read_data, |
| parport_ieee1284_epp_write_addr, |
| parport_ieee1284_epp_read_addr, |
| |
| parport_ieee1284_ecp_write_data, |
| parport_ieee1284_ecp_read_data, |
| parport_ieee1284_ecp_write_addr, |
| |
| parport_ieee1284_write_compat, |
| parport_ieee1284_read_nibble, |
| parport_ieee1284_read_byte, |
| }; |
| |
| /* --- Initialisation code -------------------------------- */ |
| |
| int parport_arc_init(void) |
| { |
| /* Archimedes hardware provides only one port, at a fixed address */ |
| struct parport *p; |
| |
| if (check_region(PORT_BASE, 1)) |
| return 0; |
| |
| p = parport_register_port (PORT_BASE, IRQ_PRINTERACK, |
| PARPORT_DMA_NONE, &parport_arc_ops); |
| |
| if (!p) |
| return 0; |
| |
| p->modes = PARPORT_MODE_ARCSPP; |
| p->size = 1; |
| |
| printk(KERN_INFO "%s: Archimedes on-board port, using irq %d\n", |
| p->irq); |
| parport_proc_register(p); |
| |
| /* Tell the high-level drivers about the port. */ |
| parport_announce_port (p); |
| |
| return 1; |
| } |