282 lines
6.5 KiB
C
282 lines
6.5 KiB
C
/*
|
|
* linux/arch/m68knommu/kernel/ints.c -- General interrupt handling code
|
|
*
|
|
* Copyright (C) 1999-2002 Greg Ungerer (gerg@snapgear.com)
|
|
* Copyright (C) 1998 D. Jeff Dionne <jeff@lineo.ca>,
|
|
* Kenneth Albanowski <kjahds@kjahds.com>,
|
|
* Copyright (C) 2000 Lineo Inc. (www.lineo.com)
|
|
*
|
|
* Based on:
|
|
*
|
|
* linux/arch/m68k/kernel/ints.c -- Linux/m68k general interrupt handling code
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file COPYING in the main directory of this archive
|
|
* for more details.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/types.h>
|
|
#include <linux/init.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/kernel_stat.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/config.h>
|
|
#include <linux/seq_file.h>
|
|
|
|
#include <asm/system.h>
|
|
#include <asm/irq.h>
|
|
#include <asm/irqnode.h>
|
|
#include <asm/traps.h>
|
|
#include <asm/page.h>
|
|
#include <asm/machdep.h>
|
|
|
|
/*
|
|
* This table stores the address info for each vector handler.
|
|
*/
|
|
irq_handler_t irq_list[SYS_IRQS];
|
|
|
|
#define NUM_IRQ_NODES 16
|
|
static irq_node_t nodes[NUM_IRQ_NODES];
|
|
|
|
/* The number of spurious interrupts */
|
|
volatile unsigned int num_spurious;
|
|
|
|
unsigned int local_bh_count[NR_CPUS];
|
|
unsigned int local_irq_count[NR_CPUS];
|
|
|
|
static irqreturn_t default_irq_handler(int irq, void *ptr, struct pt_regs *regs)
|
|
{
|
|
#if 1
|
|
printk(KERN_INFO "%s(%d): default irq handler vec=%d [0x%x]\n",
|
|
__FILE__, __LINE__, irq, irq);
|
|
#endif
|
|
return(IRQ_HANDLED);
|
|
}
|
|
|
|
/*
|
|
* void init_IRQ(void)
|
|
*
|
|
* Parameters: None
|
|
*
|
|
* Returns: Nothing
|
|
*
|
|
* This function should be called during kernel startup to initialize
|
|
* the IRQ handling routines.
|
|
*/
|
|
|
|
void __init init_IRQ(void)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < SYS_IRQS; i++) {
|
|
if (mach_default_handler)
|
|
irq_list[i].handler = (*mach_default_handler)[i];
|
|
else
|
|
irq_list[i].handler = default_irq_handler;
|
|
irq_list[i].flags = IRQ_FLG_STD;
|
|
irq_list[i].dev_id = NULL;
|
|
irq_list[i].devname = NULL;
|
|
}
|
|
|
|
for (i = 0; i < NUM_IRQ_NODES; i++)
|
|
nodes[i].handler = NULL;
|
|
|
|
if (mach_init_IRQ)
|
|
mach_init_IRQ();
|
|
}
|
|
|
|
irq_node_t *new_irq_node(void)
|
|
{
|
|
irq_node_t *node;
|
|
short i;
|
|
|
|
for (node = nodes, i = NUM_IRQ_NODES-1; i >= 0; node++, i--)
|
|
if (!node->handler)
|
|
return node;
|
|
|
|
printk(KERN_INFO "new_irq_node: out of nodes\n");
|
|
return NULL;
|
|
}
|
|
|
|
int request_irq(
|
|
unsigned int irq,
|
|
irqreturn_t (*handler)(int, void *, struct pt_regs *),
|
|
unsigned long flags,
|
|
const char *devname,
|
|
void *dev_id)
|
|
{
|
|
if (irq < 0 || irq >= NR_IRQS) {
|
|
printk(KERN_WARNING "%s: Incorrect IRQ %d from %s\n", __FUNCTION__,
|
|
irq, devname);
|
|
return -ENXIO;
|
|
}
|
|
|
|
if (!(irq_list[irq].flags & IRQ_FLG_STD)) {
|
|
if (irq_list[irq].flags & IRQ_FLG_LOCK) {
|
|
printk(KERN_WARNING "%s: IRQ %d from %s is not replaceable\n",
|
|
__FUNCTION__, irq, irq_list[irq].devname);
|
|
return -EBUSY;
|
|
}
|
|
if (flags & IRQ_FLG_REPLACE) {
|
|
printk(KERN_WARNING "%s: %s can't replace IRQ %d from %s\n",
|
|
__FUNCTION__, devname, irq, irq_list[irq].devname);
|
|
return -EBUSY;
|
|
}
|
|
}
|
|
|
|
if (flags & IRQ_FLG_FAST) {
|
|
extern asmlinkage void fasthandler(void);
|
|
extern void set_evector(int vecnum, void (*handler)(void));
|
|
set_evector(irq, fasthandler);
|
|
}
|
|
|
|
irq_list[irq].handler = handler;
|
|
irq_list[irq].flags = flags;
|
|
irq_list[irq].dev_id = dev_id;
|
|
irq_list[irq].devname = devname;
|
|
return 0;
|
|
}
|
|
|
|
EXPORT_SYMBOL(request_irq);
|
|
|
|
void free_irq(unsigned int irq, void *dev_id)
|
|
{
|
|
if (irq >= NR_IRQS) {
|
|
printk(KERN_WARNING "%s: Incorrect IRQ %d\n", __FUNCTION__, irq);
|
|
return;
|
|
}
|
|
|
|
if (irq_list[irq].dev_id != dev_id)
|
|
printk(KERN_WARNING "%s: Removing probably wrong IRQ %d from %s\n",
|
|
__FUNCTION__, irq, irq_list[irq].devname);
|
|
|
|
if (irq_list[irq].flags & IRQ_FLG_FAST) {
|
|
extern asmlinkage void inthandler(void);
|
|
extern void set_evector(int vecnum, void (*handler)(void));
|
|
set_evector(irq, inthandler);
|
|
}
|
|
|
|
if (mach_default_handler)
|
|
irq_list[irq].handler = (*mach_default_handler)[irq];
|
|
else
|
|
irq_list[irq].handler = default_irq_handler;
|
|
irq_list[irq].flags = IRQ_FLG_STD;
|
|
irq_list[irq].dev_id = NULL;
|
|
irq_list[irq].devname = NULL;
|
|
}
|
|
|
|
EXPORT_SYMBOL(free_irq);
|
|
|
|
|
|
int sys_request_irq(unsigned int irq,
|
|
irqreturn_t (*handler)(int, void *, struct pt_regs *),
|
|
unsigned long flags, const char *devname, void *dev_id)
|
|
{
|
|
if (irq > IRQ7) {
|
|
printk(KERN_WARNING "%s: Incorrect IRQ %d from %s\n",
|
|
__FUNCTION__, irq, devname);
|
|
return -ENXIO;
|
|
}
|
|
|
|
#if 0
|
|
if (!(irq_list[irq].flags & IRQ_FLG_STD)) {
|
|
if (irq_list[irq].flags & IRQ_FLG_LOCK) {
|
|
printk(KERN_WARNING "%s: IRQ %d from %s is not replaceable\n",
|
|
__FUNCTION__, irq, irq_list[irq].devname);
|
|
return -EBUSY;
|
|
}
|
|
if (!(flags & IRQ_FLG_REPLACE)) {
|
|
printk(KERN_WARNING "%s: %s can't replace IRQ %d from %s\n",
|
|
__FUNCTION__, devname, irq, irq_list[irq].devname);
|
|
return -EBUSY;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
irq_list[irq].handler = handler;
|
|
irq_list[irq].flags = flags;
|
|
irq_list[irq].dev_id = dev_id;
|
|
irq_list[irq].devname = devname;
|
|
return 0;
|
|
}
|
|
|
|
void sys_free_irq(unsigned int irq, void *dev_id)
|
|
{
|
|
if (irq > IRQ7) {
|
|
printk(KERN_WARNING "%s: Incorrect IRQ %d\n", __FUNCTION__, irq);
|
|
return;
|
|
}
|
|
|
|
if (irq_list[irq].dev_id != dev_id)
|
|
printk(KERN_WARNING "%s: Removing probably wrong IRQ %d from %s\n",
|
|
__FUNCTION__, irq, irq_list[irq].devname);
|
|
|
|
irq_list[irq].handler = (*mach_default_handler)[irq];
|
|
irq_list[irq].flags = 0;
|
|
irq_list[irq].dev_id = NULL;
|
|
irq_list[irq].devname = NULL;
|
|
}
|
|
|
|
/*
|
|
* Do we need these probe functions on the m68k?
|
|
*
|
|
* ... may be useful with ISA devices
|
|
*/
|
|
unsigned long probe_irq_on (void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
EXPORT_SYMBOL(probe_irq_on);
|
|
|
|
int probe_irq_off (unsigned long irqs)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
EXPORT_SYMBOL(probe_irq_off);
|
|
|
|
asmlinkage void process_int(unsigned long vec, struct pt_regs *fp)
|
|
{
|
|
if (vec >= VEC_INT1 && vec <= VEC_INT7) {
|
|
vec -= VEC_SPUR;
|
|
kstat_cpu(0).irqs[vec]++;
|
|
irq_list[vec].handler(vec, irq_list[vec].dev_id, fp);
|
|
} else {
|
|
if (mach_process_int)
|
|
mach_process_int(vec, fp);
|
|
else
|
|
panic("Can't process interrupt vector %ld\n", vec);
|
|
return;
|
|
}
|
|
}
|
|
|
|
|
|
int show_interrupts(struct seq_file *p, void *v)
|
|
{
|
|
int i = *(loff_t *) v;
|
|
|
|
if (i < NR_IRQS) {
|
|
if (! (irq_list[i].flags & IRQ_FLG_STD)) {
|
|
seq_printf(p, "%3d: %10u ", i,
|
|
(i ? kstat_cpu(0).irqs[i] : num_spurious));
|
|
if (irq_list[i].flags & IRQ_FLG_LOCK)
|
|
seq_printf(p, "L ");
|
|
else
|
|
seq_printf(p, " ");
|
|
seq_printf(p, "%s\n", irq_list[i].devname);
|
|
}
|
|
}
|
|
|
|
if (i == NR_IRQS && mach_get_irq_list)
|
|
mach_get_irq_list(p, v);
|
|
return 0;
|
|
}
|
|
|
|
void init_irq_proc(void)
|
|
{
|
|
/* Insert /proc/irq driver here */
|
|
}
|
|
|