patch-2.4.22 linux-2.4.22/arch/mips/kernel/old-irq.c

• Lines: 409
• Date: 1969-12-31 16:00:00.000000000 -0800
• Orig file: linux-2.4.21/arch/mips/kernel/old-irq.c
• Orig date: 2002-11-28 15:53:10.000000000 -0800

diff -urN linux-2.4.21/arch/mips/kernel/old-irq.c linux-2.4.22/arch/mips/kernel/old-irq.c
@@ -1,408 +0,0 @@
-/*
- * This file is subject to the terms and conditions of the GNU General Public
- * License.  See the file "COPYING" in the main directory of this archive
- * for more details.
- *
- * Code to handle x86 style IRQs plus some generic interrupt stuff.
- *
- * Copyright (C) 1992 Linus Torvalds
- * Copyright (C) 1994 - 2001 Ralf Baechle
- *
- * Old rotten IRQ code.  To be killed as soon as everybody had converted or
- * in 2.5.0, whatever comes first.
- */
-#include <linux/config.h>
-#include <linux/errno.h>
-#include <linux/init.h>
-#include <linux/kernel_stat.h>
-#include <linux/module.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/irq.h>
-#include <asm/mipsregs.h>
-#include <asm/system.h>
-#include <asm/nile4.h>
-
-/*
- * The board specific setup routine sets irq_setup to point to a board
- * specific setup routine.
- */
-void (*irq_setup)(void);
-
-/*
- * Linux has a controller-independent x86 interrupt architecture.
- * every controller has a 'controller-template', that is used
- * by the main code to do the right thing. Each driver-visible
- * interrupt source is transparently wired to the apropriate
- * controller. Thus drivers need not be aware of the
- * interrupt-controller.
- *
- * Various interrupt controllers we handle: 8259 PIC, SMP IO-APIC,
- * PIIX4's internal 8259 PIC and SGI's Visual Workstation Cobalt (IO-)APIC.
- * (IO-APICs assumed to be messaging to Pentium local-APICs)
- *
- * the code is designed to be easily extended with new/different
- * interrupt controllers, without having to do assembly magic.
- */
-
-/*
- * This contains the irq mask for both 8259A irq controllers, it's an
- * int so we can deal with the third PIC in some systems like the RM300.
- * (XXX This is broken for big endian.)
- */
-static unsigned int cached_irq_mask = 0xffff;
-
-#define __byte(x,y) (((unsigned char *)&(y))[x])
-#define __word(x,y) (((unsigned short *)&(y))[x])
-#define __long(x,y) (((unsigned int *)&(y))[x])
-
-#define cached_21       (__byte(0,cached_irq_mask))
-#define cached_A1       (__byte(1,cached_irq_mask))
-
-volatile unsigned long irq_err_count;
-
-/*
- * (un)mask_irq, disable_irq() and enable_irq() only handle (E)ISA and
- * PCI devices.  Other onboard hardware needs specific routines.
- */
-static inline void mask_irq(unsigned int irq)
-{
-	cached_irq_mask |= 1 << irq;
-	if (irq & 8) {
-		outb(cached_A1, 0xa1);
-	} else {
-		outb(cached_21, 0x21);
-	}
-}
-
-static inline void unmask_irq(unsigned int irq)
-{
-	cached_irq_mask &= ~(1 << irq);
-	if (irq & 8) {
-		outb(cached_A1, 0xa1);
-	} else {
-		outb(cached_21, 0x21);
-	}
-}
-
-void i8259_disable_irq(unsigned int irq_nr)
-{
-	unsigned long flags;
-
-	save_and_cli(flags);
-	mask_irq(irq_nr);
-	restore_flags(flags);
-}
-
-void i8259_enable_irq(unsigned int irq_nr)
-{
-	unsigned long flags;
-	save_and_cli(flags);
-	unmask_irq(irq_nr);
-	restore_flags(flags);
-}
-
-static struct irqaction *irq_action[NR_IRQS] = {
-	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,
-	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;
-}
-
-static inline void i8259_mask_and_ack_irq(int irq)
-{
-	cached_irq_mask |= 1 << irq;
-
-	if (irq & 8) {
-		inb(0xa1);
-		outb(cached_A1, 0xa1);
-		outb(0x62, 0x20);		/* Specific EOI to cascade */
-                outb(0x20, 0xa0);
-        } else {
-		inb(0x21);
-		outb(cached_21, 0x21);
-		outb(0x20, 0x20);
-        }
-}
-
-asmlinkage void i8259_do_irq(int irq, struct pt_regs *regs)
-{
-	struct irqaction *action;
-	int do_random, cpu;
-
-	cpu = smp_processor_id();
-	irq_enter(cpu, irq);
-
-	if (irq >= 16)
-		goto out;
-
-	i8259_mask_and_ack_irq(irq);
-
-	kstat.irqs[cpu][irq]++;
-
-	action = *(irq + irq_action);
-	if (!action)
-		goto out;
-
-	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);
-
-out:
-	irq_exit(cpu, irq);
-}
-
-/*
- * 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]++;
-
-	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();
-	}
-	irq_exit(cpu, irq);
-
-	if (softirq_pending(cpu))
-		do_softirq();
-
-	/* unmasking and bottom half handling is done magically for us. */
-}
-
-int i8259_setup_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) {
-		if (is_i8259_irq(irq))
-		    unmask_irq(irq);
-#if (defined(CONFIG_DDB5074) || defined(CONFIG_DDB5476))
-		else
-		    nile4_enable_irq(irq_to_nile4(irq));
-#endif
-	}
-	restore_flags(flags);
-	return 0;
-}
-
-/*
- * Request_interrupt and free_interrupt ``sort of'' handle interrupts of
- * non i8259 devices.  They will have to be replaced by architecture
- * specific variants.  For now we still use this as broken as it is because
- * it used to work ...
- */
-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 = i8259_setup_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 > 31) {
-		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)
-{
-	unsigned int i, irqs = 0;
-	unsigned long delay;
-
-	/* first, enable any unassigned (E)ISA irqs */
-	for (i = 15; i > 0; i--) {
-		if (!irq_action[i]) {
-			i8259_enable_irq(i);
-			irqs |= (1 << i);
-		}
-	}
-
-	/* wait for spurious interrupts to mask themselves out again */
-	for (delay = jiffies + HZ/10; time_before(jiffies, delay); )
-		/* about 100ms delay */;
-
-	/* now filter out any obviously spurious interrupts */
-	return irqs & ~cached_irq_mask;
-}
-
-int probe_irq_off (unsigned long irqs)
-{
-	unsigned int i;
-
-#ifdef DEBUG
-	printk("probe_irq_off: irqs=0x%04x irqmask=0x%04x\n", irqs, irqmask);
-#endif
-	irqs &= cached_irq_mask;
-	if (!irqs)
-		return 0;
-	i = ffz(~irqs);
-	if (irqs != (irqs & (1 << i)))
-		i = -i;
-	return i;
-}
-
-void __init i8259_init(void)
-{
-	/* Init master interrupt controller */
-	outb(0x11, 0x20); /* Start init sequence */
-	outb(0x00, 0x21); /* Vector base */
-	outb(0x04, 0x21); /* edge tiggered, Cascade (slave) on IRQ2 */
-	outb(0x01, 0x21); /* Select 8086 mode */
-	outb(0xff, 0x21); /* Mask all */
-
-	/* Init slave interrupt controller */
-	outb(0x11, 0xa0); /* Start init sequence */
-	outb(0x08, 0xa1); /* Vector base */
-	outb(0x02, 0xa1); /* edge triggered, Cascade (slave) on IRQ2 */
-	outb(0x01, 0xa1); /* Select 8086 mode */
-	outb(0xff, 0xa1); /* Mask all */
-
-	outb(cached_A1, 0xa1);
-	outb(cached_21, 0x21);
-}
-
-void __init init_IRQ(void)
-{
-	/* i8259_init(); */
-	irq_setup();
-}
-
-EXPORT_SYMBOL(free_irq);
-EXPORT_SYMBOL(request_irq);