b5dc7840b3
Introduce irq controller and use it to manage auto vector interrupts. Introduce setup_irq() which can be used for irq setup. Signed-off-by: Roman Zippel <zippel@linux-m68k.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
150 lines
3.4 KiB
C
150 lines
3.4 KiB
C
/*
|
|
* 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 <linux/interrupt.h>
|
|
#include <linux/seq_file.h>
|
|
|
|
#include <asm/system.h>
|
|
#include <asm/ptrace.h>
|
|
#include <asm/irq.h>
|
|
|
|
static irqreturn_t mvme16x_defhand (int irq, void *dev_id, struct pt_regs *fp);
|
|
|
|
/*
|
|
* This should ideally be 4 elements only, for speed.
|
|
*/
|
|
|
|
static struct {
|
|
irqreturn_t (*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,
|
|
irqreturn_t (*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;
|
|
}
|
|
|
|
irqreturn_t mvme16x_process_int (unsigned long vec, struct pt_regs *fp)
|
|
{
|
|
if (vec < 64 || vec > 255) {
|
|
printk ("mvme16x_process_int: Illegal vector %ld", vec);
|
|
return IRQ_NONE;
|
|
} else {
|
|
irq_tab[vec-64].count++;
|
|
irq_tab[vec-64].handler(vec, irq_tab[vec-64].dev_id, fp);
|
|
return IRQ_HANDLED;
|
|
}
|
|
}
|
|
|
|
int show_mvme16x_interrupts (struct seq_file *p, void *v)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < 192; i++) {
|
|
if (irq_tab[i].count)
|
|
seq_printf(p, "Vec 0x%02x: %8d %s\n",
|
|
i+64, irq_tab[i].count,
|
|
irq_tab[i].devname ? irq_tab[i].devname : "free");
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
static irqreturn_t mvme16x_defhand (int irq, void *dev_id, struct pt_regs *fp)
|
|
{
|
|
printk ("Unknown interrupt 0x%02x\n", irq);
|
|
return IRQ_NONE;
|
|
}
|
|
|
|
|
|
void mvme16x_enable_irq (unsigned int irq)
|
|
{
|
|
}
|
|
|
|
|
|
void mvme16x_disable_irq (unsigned int irq)
|
|
{
|
|
}
|
|
|
|
|