159 lines
3.6 KiB
C
159 lines
3.6 KiB
C
/*
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* Linux/m68k general interrupt handling code from arch/m68k/kernel/ints.c
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* Needed to drive the m68k emulating IRQ hardware on the PowerUp boards.
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*/
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#include <linux/types.h>
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#include <linux/sched.h>
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#include <linux/kernel_stat.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/seq_file.h>
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#include <asm/setup.h>
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#include <asm/system.h>
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#include <asm/irq.h>
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#include <asm/traps.h>
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#include <asm/page.h>
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#include <asm/machdep.h>
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/* table for system interrupt handlers */
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static irq_handler_t irq_list[SYS_IRQS];
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static const char *default_names[SYS_IRQS] = {
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"spurious int", "int1 handler", "int2 handler", "int3 handler",
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"int4 handler", "int5 handler", "int6 handler", "int7 handler"
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};
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/* The number of spurious interrupts */
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volatile unsigned int num_spurious;
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#define NUM_IRQ_NODES 100
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static irq_node_t nodes[NUM_IRQ_NODES];
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/*
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* void init_IRQ(void)
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*
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* Parameters: None
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*
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* Returns: Nothing
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*
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* This function should be called during kernel startup to initialize
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* the IRQ handling routines.
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*/
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__init
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void m68k_init_IRQ(void)
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{
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int i;
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for (i = 0; i < SYS_IRQS; i++) {
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if (mach_default_handler)
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irq_list[i].handler = (*mach_default_handler)[i];
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irq_list[i].flags = 0;
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irq_list[i].dev_id = NULL;
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irq_list[i].devname = default_names[i];
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}
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for (i = 0; i < NUM_IRQ_NODES; i++)
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nodes[i].handler = NULL;
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mach_init_IRQ ();
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}
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irq_node_t *new_irq_node(void)
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{
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irq_node_t *node;
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short i;
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for (node = nodes, i = NUM_IRQ_NODES-1; i >= 0; node++, i--)
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if (!node->handler)
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return node;
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printk ("new_irq_node: out of nodes\n");
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return NULL;
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}
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int sys_request_irq(unsigned int irq,
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void (*handler)(int, void *, struct pt_regs *),
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unsigned long flags, const char *devname, void *dev_id)
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{
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if (irq < IRQ1 || irq > IRQ7) {
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printk("%s: Incorrect IRQ %d from %s\n",
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__FUNCTION__, irq, devname);
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return -ENXIO;
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}
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#if 0
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if (!(irq_list[irq].flags & IRQ_FLG_STD)) {
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if (irq_list[irq].flags & IRQ_FLG_LOCK) {
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printk("%s: IRQ %d from %s is not replaceable\n",
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__FUNCTION__, irq, irq_list[irq].devname);
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return -EBUSY;
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}
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if (!(flags & IRQ_FLG_REPLACE)) {
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printk("%s: %s can't replace IRQ %d from %s\n",
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__FUNCTION__, devname, irq, irq_list[irq].devname);
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return -EBUSY;
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}
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}
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#endif
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irq_list[irq].handler = handler;
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irq_list[irq].flags = flags;
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irq_list[irq].dev_id = dev_id;
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irq_list[irq].devname = devname;
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return 0;
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}
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void sys_free_irq(unsigned int irq, void *dev_id)
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{
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if (irq < IRQ1 || irq > IRQ7) {
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printk("%s: Incorrect IRQ %d\n", __FUNCTION__, irq);
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return;
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}
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if (irq_list[irq].dev_id != dev_id)
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printk("%s: Removing probably wrong IRQ %d from %s\n",
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__FUNCTION__, irq, irq_list[irq].devname);
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irq_list[irq].handler = (*mach_default_handler)[irq];
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irq_list[irq].flags = 0;
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irq_list[irq].dev_id = NULL;
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irq_list[irq].devname = default_names[irq];
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}
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asmlinkage void process_int(unsigned long vec, struct pt_regs *fp)
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{
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if (vec >= VEC_INT1 && vec <= VEC_INT7 && !MACH_IS_BVME6000) {
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vec -= VEC_SPUR;
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kstat_cpu(0).irqs[vec]++;
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irq_list[vec].handler(vec, irq_list[vec].dev_id, fp);
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} else {
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if (mach_process_int)
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mach_process_int(vec, fp);
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else
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panic("Can't process interrupt vector %ld\n", vec);
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return;
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}
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}
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int m68k_get_irq_list(struct seq_file *p, void *v)
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{
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int i;
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/* autovector interrupts */
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if (mach_default_handler) {
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for (i = 0; i < SYS_IRQS; i++) {
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seq_printf(p, "auto %2d: %10u ", i,
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i ? kstat_cpu(0).irqs[i] : num_spurious);
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seq_puts(p, " ");
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seq_printf(p, "%s\n", irq_list[i].devname);
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}
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}
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mach_get_irq_list(p, v);
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return 0;
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}
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