mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-06 02:50:43 +00:00
![Linus Torvalds](/assets/img/avatar_default.png)
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
139 lines
3.6 KiB
C
139 lines
3.6 KiB
C
/* 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)
|