150 lines
3.4 KiB
C
150 lines
3.4 KiB
C
/*
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* arch/m68k/mvme16x/16xints.c
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*
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* Copyright (C) 1995 Richard Hirst [richard@sleepie.demon.co.uk]
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*
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* based on amiints.c -- Amiga Linux interrupt handling code
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file README.legal in the main directory of this archive
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* for more details.
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*
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/seq_file.h>
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#include <asm/system.h>
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#include <asm/ptrace.h>
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#include <asm/irq.h>
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static irqreturn_t mvme16x_defhand (int irq, void *dev_id, struct pt_regs *fp);
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/*
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* This should ideally be 4 elements only, for speed.
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*/
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static struct {
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irqreturn_t (*handler)(int, void *, struct pt_regs *);
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unsigned long flags;
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void *dev_id;
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const char *devname;
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unsigned count;
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} irq_tab[192];
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/*
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* void mvme16x_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 is called during kernel startup to initialize
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* the mvme16x IRQ handling routines. Should probably ensure
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* that the base vectors for the VMEChip2 and PCCChip2 are valid.
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*/
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void mvme16x_init_IRQ (void)
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{
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int i;
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for (i = 0; i < 192; i++) {
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irq_tab[i].handler = mvme16x_defhand;
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irq_tab[i].flags = IRQ_FLG_STD;
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irq_tab[i].dev_id = NULL;
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irq_tab[i].devname = NULL;
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irq_tab[i].count = 0;
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}
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}
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int mvme16x_request_irq(unsigned int irq,
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irqreturn_t (*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 < 64 || irq > 255) {
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printk("%s: Incorrect IRQ %d from %s\n", __FUNCTION__, irq, devname);
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return -ENXIO;
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}
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if (!(irq_tab[irq-64].flags & IRQ_FLG_STD)) {
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if (irq_tab[irq-64].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_tab[irq-64].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_tab[irq-64].devname);
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return -EBUSY;
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}
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}
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irq_tab[irq-64].handler = handler;
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irq_tab[irq-64].flags = flags;
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irq_tab[irq-64].dev_id = dev_id;
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irq_tab[irq-64].devname = devname;
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return 0;
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}
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void mvme16x_free_irq(unsigned int irq, void *dev_id)
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{
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if (irq < 64 || irq > 255) {
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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_tab[irq-64].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_tab[irq-64].devname);
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irq_tab[irq-64].handler = mvme16x_defhand;
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irq_tab[irq-64].flags = IRQ_FLG_STD;
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irq_tab[irq-64].dev_id = NULL;
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irq_tab[irq-64].devname = NULL;
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}
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irqreturn_t mvme16x_process_int (unsigned long vec, struct pt_regs *fp)
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{
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if (vec < 64 || vec > 255) {
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printk ("mvme16x_process_int: Illegal vector %ld", vec);
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return IRQ_NONE;
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} else {
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irq_tab[vec-64].count++;
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irq_tab[vec-64].handler(vec, irq_tab[vec-64].dev_id, fp);
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return IRQ_HANDLED;
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}
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}
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int show_mvme16x_interrupts (struct seq_file *p, void *v)
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{
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int i;
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for (i = 0; i < 192; i++) {
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if (irq_tab[i].count)
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seq_printf(p, "Vec 0x%02x: %8d %s\n",
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i+64, irq_tab[i].count,
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irq_tab[i].devname ? irq_tab[i].devname : "free");
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}
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return 0;
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}
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static irqreturn_t mvme16x_defhand (int irq, void *dev_id, struct pt_regs *fp)
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{
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printk ("Unknown interrupt 0x%02x\n", irq);
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return IRQ_NONE;
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}
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void mvme16x_enable_irq (unsigned int irq)
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{
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}
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void mvme16x_disable_irq (unsigned int irq)
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{
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}
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