patch-2.4.20 linux-2.4.20/arch/mips/dec/irq.c

• Lines: 308
• Date: Wed Dec 31 16:00:00 1969
• Orig file: linux-2.4.19/arch/mips/dec/irq.c
• Orig date: Fri Aug 2 17:39:43 2002

diff -urN linux-2.4.19/arch/mips/dec/irq.c linux-2.4.20/arch/mips/dec/irq.c
@@ -1,307 +0,0 @@
-/*
- * Code to handle DECstation IRQs plus some generic interrupt stuff.
- *
- * Copyright (C) 1992 Linus Torvalds
- * Copyright (C) 1994, 1995, 1996, 1997, 2000 Ralf Baechle
- */
-#include <linux/errno.h>
-#include <linux/init.h>
-#include <linux/kernel_stat.h>
-#include <linux/signal.h>
-#include <linux/sched.h>
-#include <linux/types.h>
-#include <linux/interrupt.h>
-#include <linux/ioport.h>
-#include <linux/timex.h>
-#include <linux/slab.h>
-#include <linux/random.h>
-
-#include <asm/bitops.h>
-#include <asm/bootinfo.h>
-#include <asm/io.h>
-#include <asm/mipsregs.h>
-#include <asm/system.h>
-
-#include <asm/dec/interrupts.h>
-
-extern void dec_init_kn01(void);
-extern void dec_init_kn230(void);
-extern void dec_init_kn02(void);
-extern void dec_init_kn02ba(void);
-extern void dec_init_kn02ca(void);
-extern void dec_init_kn03(void);
-
-extern asmlinkage void decstation_handle_int(void);
-
-atomic_t irq_err_count;
-
-static inline void mask_irq(unsigned int irq_nr)
-{
-	unsigned int dummy;
-
-	if (dec_interrupt[irq_nr].iemask) {	/* This is an ASIC interrupt    */
-		*imr &= ~dec_interrupt[irq_nr].iemask;
-		dummy = *imr;
-		dummy = *imr;
-	} else			/* This is a cpu interrupt        */
-		change_cp0_status(ST0_IM,
-				  read_32bit_cp0_register(CP0_STATUS) &
-				  ~dec_interrupt[irq_nr].cpu_mask);
-}
-
-static inline void unmask_irq(unsigned int irq_nr)
-{
-	unsigned int dummy;
-
-	if (dec_interrupt[irq_nr].iemask) {	/* This is an ASIC interrupt    */
-		*imr |= dec_interrupt[irq_nr].iemask;
-		dummy = *imr;
-		dummy = *imr;
-	}
-	change_cp0_status(ST0_IM,
-			  read_32bit_cp0_register(CP0_STATUS) |
-			  dec_interrupt[irq_nr].cpu_mask);
-}
-
-void disable_irq(unsigned int irq_nr)
-{
-	unsigned long flags;
-
-	save_and_cli(flags);
-	mask_irq(irq_nr);
-	restore_flags(flags);
-}
-
-void enable_irq(unsigned int irq_nr)
-{
-	unsigned long flags;
-
-	save_and_cli(flags);
-	unmask_irq(irq_nr);
-	restore_flags(flags);
-}
-
-/*
- * Pointers to the low-level handlers: first the general ones, then the
- * fast ones, then the bad ones.
- */
-extern void interrupt(void);
-
-static struct irqaction *irq_action[32] = {
-	NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
-	NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
-	NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
-	NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
-};
-
-int get_irq_list(char *buf)
-{
-	int i, len = 0;
-	struct irqaction *action;
-
-	for (i = 0; i < 32; i++) {
-		action = irq_action[i];
-		if (!action)
-			continue;
-		len += sprintf(buf + len, "%2d: %8d %c %s",
-			       i, kstat.irqs[0][i],
-			       (action->flags & SA_INTERRUPT) ? '+' : ' ',
-			       action->name);
-		for (action = action->next; action; action = action->next) {
-			len += sprintf(buf + len, ",%s %s",
-				       (action->
-					flags & SA_INTERRUPT) ? " +" : "",
-				       action->name);
-		}
-		len += sprintf(buf + len, "\n");
-	}
-	return len;
-}
-
-/*
- * do_IRQ handles IRQ's that have been installed without the
- * SA_INTERRUPT flag: it uses the full signal-handling return
- * and runs with other interrupts enabled. All relatively slow
- * IRQ's should use this format: notably the keyboard/timer
- * routines.
- */
-asmlinkage void do_IRQ(int irq, struct pt_regs *regs)
-{
-	struct irqaction *action;
-	int do_random, cpu;
-
-	cpu = smp_processor_id();
-	irq_enter(cpu, irq);
-	kstat.irqs[cpu][irq]++;
-
-	mask_irq(irq);
-	action = *(irq + irq_action);
-	if (action) {
-		if (!(action->flags & SA_INTERRUPT))
-			__sti();
-		action = *(irq + irq_action);
-		do_random = 0;
-		do {
-			do_random |= action->flags;
-			action->handler(irq, action->dev_id, regs);
-			action = action->next;
-		} while (action);
-		if (do_random & SA_SAMPLE_RANDOM)
-			add_interrupt_randomness(irq);
-		__cli();
-		unmask_irq(irq);
-	}
-	irq_exit(cpu, irq);
-
-	if (softirq_pending(cpu))
-		do_softirq();
-}
-
-/*
- * Idea is to put all interrupts
- * in a single table and differenciate them just by number.
- */
-int setup_dec_irq(int irq, struct irqaction *new)
-{
-	int shared = 0;
-	struct irqaction *old, **p;
-	unsigned long flags;
-
-	p = irq_action + irq;
-	if ((old = *p) != NULL) {
-		/* Can't share interrupts unless both agree to */
-		if (!(old->flags & new->flags & SA_SHIRQ))
-			return -EBUSY;
-
-		/* Can't share interrupts unless both are same type */
-		if ((old->flags ^ new->flags) & SA_INTERRUPT)
-			return -EBUSY;
-
-		/* add new interrupt at end of irq queue */
-		do {
-			p = &old->next;
-			old = *p;
-		} while (old);
-		shared = 1;
-	}
-	if (new->flags & SA_SAMPLE_RANDOM)
-		rand_initialize_irq(irq);
-
-	save_and_cli(flags);
-	*p = new;
-
-	if (!shared) {
-		unmask_irq(irq);
-	}
-	restore_flags(flags);
-	return 0;
-}
-
-int request_irq(unsigned int irq,
-		void (*handler) (int, void *, struct pt_regs *),
-		unsigned long irqflags, const char *devname, void *dev_id)
-{
-	int retval;
-	struct irqaction *action;
-
-	if (irq >= 32)
-		return -EINVAL;
-	if (!handler)
-		return -EINVAL;
-
-	action =
-	    (struct irqaction *) kmalloc(sizeof(struct irqaction),
-					 GFP_KERNEL);
-	if (!action)
-		return -ENOMEM;
-
-	action->handler = handler;
-	action->flags = irqflags;
-	action->mask = 0;
-	action->name = devname;
-	action->next = NULL;
-	action->dev_id = dev_id;
-
-	retval = setup_dec_irq(irq, action);
-
-	if (retval)
-		kfree(action);
-	return retval;
-}
-
-void free_irq(unsigned int irq, void *dev_id)
-{
-	struct irqaction *action, **p;
-	unsigned long flags;
-
-	if (irq > 39) {
-		printk("Trying to free IRQ%d\n", irq);
-		return;
-	}
-	for (p = irq + irq_action; (action = *p) != NULL;
-	     p = &action->next) {
-		if (action->dev_id != dev_id)
-			continue;
-
-		/* Found it - now free it */
-		save_and_cli(flags);
-		*p = action->next;
-		if (!irq[irq_action])
-			mask_irq(irq);
-		restore_flags(flags);
-		kfree(action);
-		return;
-	}
-	printk("Trying to free free IRQ%d\n", irq);
-}
-
-unsigned long probe_irq_on(void)
-{
-	/* TODO */
-	return 0;
-}
-
-int probe_irq_off(unsigned long irqs)
-{
-	/* TODO */
-	return 0;
-}
-
-void init_irq_proc(void)
-{
-	/* Nothing, for now.  */
-}
-
-void __init init_IRQ(void)
-{
-	switch (mips_machtype) {
-	case MACH_DS23100:
-		dec_init_kn01();
-		break;
-	case MACH_DS5100:	/*  DS5100 MIPSMATE */
-		dec_init_kn230();
-		break;
-	case MACH_DS5000_200:	/* DS5000 3max */
-		dec_init_kn02();
-		break;
-	case MACH_DS5000_1XX:	/* DS5000/100 3min */
-		dec_init_kn02ba();
-		break;
-	case MACH_DS5000_2X0:	/* DS5000/240 3max+ */
-		dec_init_kn03();
-		break;
-	case MACH_DS5000_XX:	/* Personal DS5000/2x */
-		dec_init_kn02ca();
-		break;
-	case MACH_DS5800:	/* DS5800 Isis */
-		panic("Don't know how to set this up!");
-		break;
-	case MACH_DS5400:	/* DS5400 MIPSfair */
-		panic("Don't know how to set this up!");
-		break;
-	case MACH_DS5500:	/* DS5500 MIPSfair-2 */
-		panic("Don't know how to set this up!");
-		break;
-	}
-	set_except_vector(0, decstation_handle_int);
-}