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/*
* 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/interrupt.h>
#include <linux/kernel_stat.h>
#include <linux/errno.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.
*/
struct irq_entry 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)
{
#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;
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,
irq_handler_t handler,
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;
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, irq_handler_t handler,
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_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);
} 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 */
}
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