Viewing file:  16xints.c (3.28 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
/*
* arch/m68k/mvme16x/16xints.c
*
* Copyright (C) 1995 Richard Hirst [richard@sleepie.demon.co.uk]
*
* based on amiints.c -- Amiga Linux interrupt handling code
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file README.legal in the main directory of this archive
* for more details.
*
*/
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <asm/system.h>
#include <asm/ptrace.h>
#include <asm/irq.h>
static void mvme16x_defhand (int irq, void *dev_id, struct pt_regs *fp);
/*
* This should ideally be 4 elements only, for speed.
*/
static struct {
void (*handler)(int, void *, struct pt_regs *);
unsigned long flags;
void *dev_id;
const char *devname;
unsigned count;
} irq_tab[192];
/*
* void mvme16x_init_IRQ (void)
*
* Parameters: None
*
* Returns: Nothing
*
* This function is called during kernel startup to initialize
* the mvme16x IRQ handling routines. Should probably ensure
* that the base vectors for the VMEChip2 and PCCChip2 are valid.
*/
void mvme16x_init_IRQ (void)
{
int i;
for (i = 0; i < 192; i++) {
irq_tab[i].handler = mvme16x_defhand;
irq_tab[i].flags = IRQ_FLG_STD;
irq_tab[i].dev_id = NULL;
irq_tab[i].devname = NULL;
irq_tab[i].count = 0;
}
}
int mvme16x_request_irq(unsigned int irq,
void (*handler)(int, void *, struct pt_regs *),
unsigned long flags, const char *devname, void *dev_id)
{
if (irq < 64 || irq > 255) {
printk("%s: Incorrect IRQ %d from %s\n", __FUNCTION__, irq, devname);
return -ENXIO;
}
if (!(irq_tab[irq-64].flags & IRQ_FLG_STD)) {
if (irq_tab[irq-64].flags & IRQ_FLG_LOCK) {
printk("%s: IRQ %d from %s is not replaceable\n",
__FUNCTION__, irq, irq_tab[irq-64].devname);
return -EBUSY;
}
if (flags & IRQ_FLG_REPLACE) {
printk("%s: %s can't replace IRQ %d from %s\n",
__FUNCTION__, devname, irq, irq_tab[irq-64].devname);
return -EBUSY;
}
}
irq_tab[irq-64].handler = handler;
irq_tab[irq-64].flags = flags;
irq_tab[irq-64].dev_id = dev_id;
irq_tab[irq-64].devname = devname;
return 0;
}
void mvme16x_free_irq(unsigned int irq, void *dev_id)
{
if (irq < 64 || irq > 255) {
printk("%s: Incorrect IRQ %d\n", __FUNCTION__, irq);
return;
}
if (irq_tab[irq-64].dev_id != dev_id)
printk("%s: Removing probably wrong IRQ %d from %s\n",
__FUNCTION__, irq, irq_tab[irq-64].devname);
irq_tab[irq-64].handler = mvme16x_defhand;;
irq_tab[irq-64].flags = IRQ_FLG_STD;
irq_tab[irq-64].dev_id = NULL;
irq_tab[irq-64].devname = NULL;
}
void mvme16x_process_int (unsigned long vec, struct pt_regs *fp)
{
if (vec < 64 || vec > 255)
printk ("mvme16x_process_int: Illegal vector %ld", vec);
else
{
irq_tab[vec-64].count++;
irq_tab[vec-64].handler(vec, irq_tab[vec-64].dev_id, fp);
}
}
int mvme16x_get_irq_list (char *buf)
{
int i, len = 0;
for (i = 0; i < 192; i++) {
if (irq_tab[i].count)
len += sprintf (buf+len, "Vec 0x%02x: %8d %s\n",
i+64, irq_tab[i].count,
irq_tab[i].devname ? irq_tab[i].devname : "free");
}
return len;
}
static void mvme16x_defhand (int irq, void *dev_id, struct pt_regs *fp)
{
printk ("Unknown interrupt 0x%02x\n", irq);
}
void mvme16x_enable_irq (unsigned int irq)
{
}
void mvme16x_disable_irq (unsigned int irq)
{
}
|