/*
* arch/m68k/bvme6000/bvmeints.c
*
* Copyright (C) 1997 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/seq_file.h>
#include <asm/ptrace.h>
#include <asm/system.h>
#include <asm/irq.h>
#include <asm/traps.h>
static irqreturn_t bvme6000_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[256];
/*
* void bvme6000_init_IRQ (void)
*
* Parameters: None
*
* Returns: Nothing
*
* This function is called during kernel startup to initialize
* the bvme6000 IRQ handling routines.
*/
void bvme6000_init_IRQ (void)
{
int i;
for (i = 0; i < 256; i++) {
irq_tab[i].handler = bvme6000_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 bvme6000_request_irq(unsigned int irq,
irqreturn_t (*handler)(int, void *, struct pt_regs *),
unsigned long flags, const char *devname, void *dev_id)
{
if (irq > 255) {
printk("%s: Incorrect IRQ %d from %s\n", __FUNCTION__, irq, devname);
return -ENXIO;
}
#if 0
/* Nothing special about auto-vectored devices for the BVME6000,
* but treat it specially to avoid changes elsewhere.
*/
if (irq >= VEC_INT1 && irq <= VEC_INT7)
return cpu_request_irq(irq - VEC_SPUR, handler, flags,
devname, dev_id);
#endif
if (!(irq_tab[irq].flags & IRQ_FLG_STD)) {
if (irq_tab[irq].flags & IRQ_FLG_LOCK) {
printk("%s: IRQ %d from %s is not replaceable\n",
__FUNCTION__, irq, irq_tab[irq].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].devname);
return -EBUSY;
}
}
irq_tab[irq].handler = handler;
irq_tab[irq].flags = flags;
irq_tab[irq].dev_id = dev_id;
irq_tab[irq].devname = devname;
return 0;
}
void bvme6000_free_irq(unsigned int irq, void *dev_id)
{
if (irq > 255) {
printk("%s: Incorrect IRQ %d\n", __FUNCTION__, irq);
return;
}
#if 0
if (irq >= VEC_INT1 && irq <= VEC_INT7) {
cpu_free_irq(irq - VEC_SPUR, dev_id);
return;
}
#endif
if (irq_tab[irq].dev_id != dev_id)
printk("%s: Removing probably wrong IRQ %d from %s\n",
__FUNCTION__, irq, irq_tab[irq].devname);
irq_tab[irq].handler = bvme6000_defhand;
irq_tab[irq].flags = IRQ_FLG_STD;
irq_tab[irq].dev_id = NULL;
irq_tab[irq].devname = NULL;
}
irqreturn_t bvme6000_process_int (unsigned long vec, struct pt_regs *fp)
{
if (vec > 255) {
printk ("bvme6000_process_int: Illegal vector %ld", vec);
return IRQ_NONE;
} else {
irq_tab[vec].count++;
irq_tab[vec].handler(vec, irq_tab[vec].dev_id, fp);
return IRQ_HANDLED;
}
}
int show_bvme6000_interrupts(struct seq_file *p, void *v)
{
int i;
for (i = 0; i < 256; i++) {
if (irq_tab[i].count)
seq_printf(p, "Vec 0x%02x: %8d %s\n",
i, irq_tab[i].count,
irq_tab[i].devname ? irq_tab[i].devname : "free");
}
return 0;
}
static irqreturn_t bvme6000_defhand (int irq, void *dev_id, struct pt_regs *fp)
{
printk ("Unknown interrupt 0x%02x\n", irq);
return IRQ_NONE;
}
void bvme6000_enable_irq (unsigned int irq)
{
}
void bvme6000_disable_irq (unsigned int irq)
{
}
