187 lines
4.2 KiB
C
187 lines
4.2 KiB
C
/*
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* ints.c - Generic interrupt controller support
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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 COPYING in the main directory of this archive
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* for more details.
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*
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* Copyright 1996 Roman Zippel
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* Copyright 1999 D. Jeff Dionne <jeff@rt-control.com>
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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/init.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <asm/traps.h>
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#include <asm/io.h>
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#include <asm/machdep.h>
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#if defined(CONFIG_M68328)
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#include <asm/MC68328.h>
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#elif defined(CONFIG_M68EZ328)
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#include <asm/MC68EZ328.h>
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#elif defined(CONFIG_M68VZ328)
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#include <asm/MC68VZ328.h>
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#endif
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/* assembler routines */
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asmlinkage void system_call(void);
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asmlinkage void buserr(void);
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asmlinkage void trap(void);
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asmlinkage void trap3(void);
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asmlinkage void trap4(void);
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asmlinkage void trap5(void);
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asmlinkage void trap6(void);
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asmlinkage void trap7(void);
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asmlinkage void trap8(void);
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asmlinkage void trap9(void);
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asmlinkage void trap10(void);
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asmlinkage void trap11(void);
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asmlinkage void trap12(void);
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asmlinkage void trap13(void);
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asmlinkage void trap14(void);
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asmlinkage void trap15(void);
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asmlinkage void trap33(void);
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asmlinkage void trap34(void);
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asmlinkage void trap35(void);
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asmlinkage void trap36(void);
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asmlinkage void trap37(void);
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asmlinkage void trap38(void);
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asmlinkage void trap39(void);
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asmlinkage void trap40(void);
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asmlinkage void trap41(void);
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asmlinkage void trap42(void);
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asmlinkage void trap43(void);
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asmlinkage void trap44(void);
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asmlinkage void trap45(void);
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asmlinkage void trap46(void);
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asmlinkage void trap47(void);
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asmlinkage irqreturn_t bad_interrupt(int, void *);
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asmlinkage irqreturn_t inthandler(void);
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asmlinkage irqreturn_t inthandler1(void);
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asmlinkage irqreturn_t inthandler2(void);
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asmlinkage irqreturn_t inthandler3(void);
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asmlinkage irqreturn_t inthandler4(void);
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asmlinkage irqreturn_t inthandler5(void);
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asmlinkage irqreturn_t inthandler6(void);
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asmlinkage irqreturn_t inthandler7(void);
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/* The 68k family did not have a good way to determine the source
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* of interrupts until later in the family. The EC000 core does
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* not provide the vector number on the stack, we vector everything
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* into one vector and look in the blasted mask register...
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* This code is designed to be fast, almost constant time, not clean!
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*/
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void process_int(int vec, struct pt_regs *fp)
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{
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int irq;
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int mask;
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unsigned long pend = ISR;
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while (pend) {
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if (pend & 0x0000ffff) {
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if (pend & 0x000000ff) {
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if (pend & 0x0000000f) {
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mask = 0x00000001;
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irq = 0;
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} else {
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mask = 0x00000010;
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irq = 4;
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}
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} else {
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if (pend & 0x00000f00) {
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mask = 0x00000100;
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irq = 8;
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} else {
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mask = 0x00001000;
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irq = 12;
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}
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}
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} else {
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if (pend & 0x00ff0000) {
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if (pend & 0x000f0000) {
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mask = 0x00010000;
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irq = 16;
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} else {
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mask = 0x00100000;
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irq = 20;
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}
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} else {
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if (pend & 0x0f000000) {
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mask = 0x01000000;
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irq = 24;
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} else {
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mask = 0x10000000;
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irq = 28;
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}
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}
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}
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while (! (mask & pend)) {
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mask <<=1;
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irq++;
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}
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do_IRQ(irq, fp);
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pend &= ~mask;
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}
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}
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static void intc_irq_unmask(struct irq_data *d)
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{
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IMR &= ~(1 << d->irq);
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}
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static void intc_irq_mask(struct irq_data *d)
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{
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IMR |= (1 << d->irq);
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}
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static struct irq_chip intc_irq_chip = {
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.name = "M68K-INTC",
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.irq_mask = intc_irq_mask,
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.irq_unmask = intc_irq_unmask,
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};
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/*
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* This function should be called during kernel startup to initialize
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* the machine vector table.
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*/
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void __init trap_init(void)
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{
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int i;
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/* set up the vectors */
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for (i = 72; i < 256; ++i)
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_ramvec[i] = (e_vector) bad_interrupt;
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_ramvec[32] = system_call;
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_ramvec[65] = (e_vector) inthandler1;
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_ramvec[66] = (e_vector) inthandler2;
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_ramvec[67] = (e_vector) inthandler3;
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_ramvec[68] = (e_vector) inthandler4;
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_ramvec[69] = (e_vector) inthandler5;
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_ramvec[70] = (e_vector) inthandler6;
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_ramvec[71] = (e_vector) inthandler7;
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}
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void __init init_IRQ(void)
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{
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int i;
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IVR = 0x40; /* Set DragonBall IVR (interrupt base) to 64 */
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/* turn off all interrupts */
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IMR = ~0;
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for (i = 0; (i < NR_IRQS); i++) {
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irq_set_chip(i, &intc_irq_chip);
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irq_set_handler(i, handle_level_irq);
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}
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}
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