16xints.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:3k
- /*
- * arch/m68k/mvme16x/16xints.c
- *
- * Copyright (C) 1995 Richard Hirst [richard@sleepie.demon.co.uk]
- *
- * based on amiints.c -- Amiga Linux interrupt handling code
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file README.legal in the main directory of this archive
- * for more details.
- *
- */
- #include <linux/types.h>
- #include <linux/kernel.h>
- #include <linux/errno.h>
- #include <asm/system.h>
- #include <asm/ptrace.h>
- #include <asm/irq.h>
- static void mvme16x_defhand (int irq, void *dev_id, struct pt_regs *fp);
- /*
- * This should ideally be 4 elements only, for speed.
- */
- static struct {
- void (*handler)(int, void *, struct pt_regs *);
- unsigned long flags;
- void *dev_id;
- const char *devname;
- unsigned count;
- } irq_tab[192];
- /*
- * void mvme16x_init_IRQ (void)
- *
- * Parameters: None
- *
- * Returns: Nothing
- *
- * This function is called during kernel startup to initialize
- * the mvme16x IRQ handling routines. Should probably ensure
- * that the base vectors for the VMEChip2 and PCCChip2 are valid.
- */
- void mvme16x_init_IRQ (void)
- {
- int i;
- for (i = 0; i < 192; i++) {
- irq_tab[i].handler = mvme16x_defhand;
- irq_tab[i].flags = IRQ_FLG_STD;
- irq_tab[i].dev_id = NULL;
- irq_tab[i].devname = NULL;
- irq_tab[i].count = 0;
- }
- }
- int mvme16x_request_irq(unsigned int irq,
- void (*handler)(int, void *, struct pt_regs *),
- unsigned long flags, const char *devname, void *dev_id)
- {
- if (irq < 64 || irq > 255) {
- printk("%s: Incorrect IRQ %d from %sn", __FUNCTION__, irq, devname);
- return -ENXIO;
- }
- if (!(irq_tab[irq-64].flags & IRQ_FLG_STD)) {
- if (irq_tab[irq-64].flags & IRQ_FLG_LOCK) {
- printk("%s: IRQ %d from %s is not replaceablen",
- __FUNCTION__, irq, irq_tab[irq-64].devname);
- return -EBUSY;
- }
- if (flags & IRQ_FLG_REPLACE) {
- printk("%s: %s can't replace IRQ %d from %sn",
- __FUNCTION__, devname, irq, irq_tab[irq-64].devname);
- return -EBUSY;
- }
- }
- irq_tab[irq-64].handler = handler;
- irq_tab[irq-64].flags = flags;
- irq_tab[irq-64].dev_id = dev_id;
- irq_tab[irq-64].devname = devname;
- return 0;
- }
- void mvme16x_free_irq(unsigned int irq, void *dev_id)
- {
- if (irq < 64 || irq > 255) {
- printk("%s: Incorrect IRQ %dn", __FUNCTION__, irq);
- return;
- }
- if (irq_tab[irq-64].dev_id != dev_id)
- printk("%s: Removing probably wrong IRQ %d from %sn",
- __FUNCTION__, irq, irq_tab[irq-64].devname);
- irq_tab[irq-64].handler = mvme16x_defhand;;
- irq_tab[irq-64].flags = IRQ_FLG_STD;
- irq_tab[irq-64].dev_id = NULL;
- irq_tab[irq-64].devname = NULL;
- }
- void mvme16x_process_int (unsigned long vec, struct pt_regs *fp)
- {
- if (vec < 64 || vec > 255)
- printk ("mvme16x_process_int: Illegal vector %ld", vec);
- else
- {
- irq_tab[vec-64].count++;
- irq_tab[vec-64].handler(vec, irq_tab[vec-64].dev_id, fp);
- }
- }
- int mvme16x_get_irq_list (char *buf)
- {
- int i, len = 0;
- for (i = 0; i < 192; i++) {
- if (irq_tab[i].count)
- len += sprintf (buf+len, "Vec 0x%02x: %8d %sn",
- i+64, irq_tab[i].count,
- irq_tab[i].devname ? irq_tab[i].devname : "free");
- }
- return len;
- }
- static void mvme16x_defhand (int irq, void *dev_id, struct pt_regs *fp)
- {
- printk ("Unknown interrupt 0x%02xn", irq);
- }
- void mvme16x_enable_irq (unsigned int irq)
- {
- }
- void mvme16x_disable_irq (unsigned int irq)
- {
- }