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/*
* 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.
*
* 07/03/96: Timer initialization, and thus mach_sched_init(),
* removed from request_irq() and moved to init_time().
* We should therefore consider renaming our add_isr() and
* remove_isr() to request_irq() and free_irq()
* respectively, so they are compliant with the other
* architectures. /Jes
* 11/07/96: Changed all add_/remove_isr() to request_/free_irq() calls.
* Removed irq list support, if any machine needs an irq server
* it must implement this itself (as it's already done), instead
* only default handler are used with mach_default_handler.
* request_irq got some flags different from other architectures:
* - IRQ_FLG_REPLACE : Replace an existing handler (the default one
* can be replaced without this flag)
* - IRQ_FLG_LOCK : handler can't be replaced
* There are other machine depending flags, see there
* If you want to replace a default handler you should know what
* you're doing, since it might handle different other irq sources
* which must be served /Roman Zippel
*/
#include <linux/config.h>
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/kernel_stat.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <asm/setup.h>
#include <asm/system.h>
#include <asm/irq.h>
#include <asm/traps.h>
#include <asm/page.h>
#include <asm/machdep.h>
#ifdef CONFIG_Q40
#include <asm/q40ints.h>
#endif
/* table for system interrupt handlers */
static irq_handler_t irq_list[SYS_IRQS];
static const char *default_names[SYS_IRQS] = {
"spurious int", "int1 handler", "int2 handler", "int3 handler",
"int4 handler", "int5 handler", "int6 handler", "int7 handler"
};
/* The number of spurious interrupts */
volatile unsigned int num_spurious;
#define NUM_IRQ_NODES 100
static irq_node_t nodes[NUM_IRQ_NODES];
static void dummy_enable_irq(unsigned int irq);
static void dummy_disable_irq(unsigned int irq);
static int dummy_request_irq(unsigned int irq,
void (*handler) (int, void *, struct pt_regs *),
unsigned long flags, const char *devname, void *dev_id);
static void dummy_free_irq(unsigned int irq, void *dev_id);
void (*enable_irq) (unsigned int) = dummy_enable_irq;
void (*disable_irq) (unsigned int) = dummy_disable_irq;
int (*mach_request_irq) (unsigned int, void (*)(int, void *, struct pt_regs *),
unsigned long, const char *, void *) = dummy_request_irq;
void (*mach_free_irq) (unsigned int, void *) = dummy_free_irq;
void init_irq_proc(void);
/*
* 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];
irq_list[i].flags = 0;
irq_list[i].dev_id = NULL;
irq_list[i].devname = default_names[i];
}
for (i = 0; i < NUM_IRQ_NODES; i++)
nodes[i].handler = NULL;
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 ("new_irq_node: out of nodes\n");
return NULL;
}
/*
* We will keep these functions until I have convinced Linus to move
* the declaration of them from include/linux/sched.h to
* include/asm/irq.h.
*/
int request_irq(unsigned int irq,
void (*handler) (int, void *, struct pt_regs *),
unsigned long flags, const char *devname, void *dev_id)
{
return mach_request_irq(irq, handler, flags, devname, dev_id);
}
void free_irq(unsigned int irq, void *dev_id)
{
mach_free_irq(irq, dev_id);
}
int sys_request_irq(unsigned int irq,
void (*handler)(int, void *, struct pt_regs *),
unsigned long flags, const char *devname, void *dev_id)
{
if (irq < IRQ1 || irq > IRQ7) {
printk("%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("%s: IRQ %d from %s is not replaceable\n",
__FUNCTION__, irq, irq_list[irq].devname);
return -EBUSY;
}
if (!(flags & IRQ_FLG_REPLACE)) {
printk("%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 < IRQ1 || irq > IRQ7) {
printk("%s: Incorrect IRQ %d\n", __FUNCTION__, irq);
return;
}
if (irq_list[irq].dev_id != dev_id)
printk("%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 = default_names[irq];
}
/*
* Do we need these probe functions on the m68k?
*
* ... may be useful with ISA devices
*/
unsigned long probe_irq_on (void)
{
#ifdef CONFIG_Q40
if (MACH_IS_Q40)
return q40_probe_irq_on();
#endif
return 0;
}
int probe_irq_off (unsigned long irqs)
{
#ifdef CONFIG_Q40
if (MACH_IS_Q40)
return q40_probe_irq_off(irqs);
#endif
return 0;
}
static void dummy_enable_irq(unsigned int irq)
{
printk("calling uninitialized enable_irq()\n");
}
static void dummy_disable_irq(unsigned int irq)
{
printk("calling uninitialized disable_irq()\n");
}
static int dummy_request_irq(unsigned int irq,
void (*handler) (int, void *, struct pt_regs *),
unsigned long flags, const char *devname, void *dev_id)
{
printk("calling uninitialized request_irq()\n");
return 0;
}
static void dummy_free_irq(unsigned int irq, void *dev_id)
{
printk("calling uninitialized disable_irq()\n");
}
asmlinkage void process_int(unsigned long vec, struct pt_regs *fp)
{
if (vec >= VEC_INT1 && vec <= VEC_INT7 && !MACH_IS_BVME6000) {
vec -= VEC_SPUR;
kstat.irqs[0][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 get_irq_list(char *buf)
{
int i, len = 0;
/* autovector interrupts */
if (mach_default_handler) {
for (i = 0; i < SYS_IRQS; i++) {
len += sprintf(buf+len, "auto %2d: %10u ", i,
i ? kstat.irqs[0][i] : num_spurious);
len += sprintf(buf+len, " ");
len += sprintf(buf+len, "%s\n", irq_list[i].devname);
}
}
len += mach_get_irq_list(buf+len);
return len;
}
void init_irq_proc(void)
{
/* Insert /proc/irq driver here */
}
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