/*
* Linux/m68k general interrupt handling code from arch/m68k/kernel/ints.c
* Needed to drive the m68k emulating IRQ hardware on the PowerUp boards.
*/
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/kernel_stat.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/seq_file.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>
/* 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];
/*
* void init_IRQ(void)
*
* Parameters: None
*
* Returns: Nothing
*
* This function should be called during kernel startup to initialize
* the IRQ handling routines.
*/
__init
void m68k_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;
}
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];
}
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_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 m68k_get_irq_list(struct seq_file *p, void *v)
{
int i;
/* autovector interrupts */
if (mach_default_handler) {
for (i = 0; i < SYS_IRQS; i++) {
seq_printf(p, "auto %2d: %10u ", i,
i ? kstat_cpu(0).irqs[i] : num_spurious);
seq_puts(p, " ");
seq_printf(p, "%s\n", irq_list[i].devname);
}
}
mach_get_irq_list(p, v);
return 0;
}
