LXR linux/arch/m68k/platform/68360/ints.c

   1/*
   2 * linux/arch/$(ARCH)/platform/$(PLATFORM)/ints.c
   3 *
   4 * This file is subject to the terms and conditions of the GNU General Public
   5 * License.  See the file COPYING in the main directory of this archive
   6 * for more details.
   7 *
   8 * Copyright (c) 2000  Michael Leslie <mleslie@lineo.com>
   9 * Copyright (c) 1996 Roman Zippel
  10 * Copyright (c) 1999 D. Jeff Dionne <jeff@uclinux.org>
  11 */
  12
  13#include <linux/types.h>
  14#include <linux/kernel.h>
  15#include <linux/init.h>
  16#include <linux/interrupt.h>
  17#include <linux/irq.h>
  18#include <asm/traps.h>
  19#include <asm/machdep.h>
  20#include <asm/m68360.h>
  21
  22/* from quicc/commproc.c: */
  23extern QUICC *pquicc;
  24extern void cpm_interrupt_init(void);
  25
  26#define INTERNAL_IRQS (96)
  27
  28/* assembler routines */
  29asmlinkage void system_call(void);
  30asmlinkage void buserr(void);
  31asmlinkage void trap(void);
  32asmlinkage void bad_interrupt(void);
  33asmlinkage void inthandler(void);
  34
  35static void intc_irq_unmask(struct irq_data *d)
  36{
  37        pquicc->intr_cimr |= (1 << d->irq);
  38}
  39
  40static void intc_irq_mask(struct irq_data *d)
  41{
  42        pquicc->intr_cimr &= ~(1 << d->irq);
  43}
  44
  45static void intc_irq_ack(struct irq_data *d)
  46{
  47        pquicc->intr_cisr = (1 << d->irq);
  48}
  49
  50static struct irq_chip intc_irq_chip = {
  51        .name           = "M68K-INTC",
  52        .irq_mask       = intc_irq_mask,
  53        .irq_unmask     = intc_irq_unmask,
  54        .irq_ack        = intc_irq_ack,
  55};
  56
  57/*
  58 * This function should be called during kernel startup to initialize
  59 * the vector table.
  60 */
  61void __init trap_init(void)
  62{
  63        int vba = (CPM_VECTOR_BASE<<4);
  64
  65        /* set up the vectors */
  66        _ramvec[2] = buserr;
  67        _ramvec[3] = trap;
  68        _ramvec[4] = trap;
  69        _ramvec[5] = trap;
  70        _ramvec[6] = trap;
  71        _ramvec[7] = trap;
  72        _ramvec[8] = trap;
  73        _ramvec[9] = trap;
  74        _ramvec[10] = trap;
  75        _ramvec[11] = trap;
  76        _ramvec[12] = trap;
  77        _ramvec[13] = trap;
  78        _ramvec[14] = trap;
  79        _ramvec[15] = trap;
  80
  81        _ramvec[32] = system_call;
  82        _ramvec[33] = trap;
  83
  84        cpm_interrupt_init();
  85
  86        /* set up CICR for vector base address and irq level */
  87        /* irl = 4, hp = 1f - see MC68360UM p 7-377 */
  88        pquicc->intr_cicr = 0x00e49f00 | vba;
  89
  90        /* CPM interrupt vectors: (p 7-376) */
  91        _ramvec[vba+CPMVEC_ERROR]       = bad_interrupt; /* Error */
  92        _ramvec[vba+CPMVEC_PIO_PC11]    = inthandler;   /* pio - pc11 */
  93        _ramvec[vba+CPMVEC_PIO_PC10]    = inthandler;   /* pio - pc10 */
  94        _ramvec[vba+CPMVEC_SMC2]        = inthandler;   /* smc2/pip */
  95        _ramvec[vba+CPMVEC_SMC1]        = inthandler;   /* smc1 */
  96        _ramvec[vba+CPMVEC_SPI]         = inthandler;   /* spi */
  97        _ramvec[vba+CPMVEC_PIO_PC9]     = inthandler;   /* pio - pc9 */
  98        _ramvec[vba+CPMVEC_TIMER4]      = inthandler;   /* timer 4 */
  99        _ramvec[vba+CPMVEC_RESERVED1]   = inthandler;   /* reserved */
 100        _ramvec[vba+CPMVEC_PIO_PC8]     = inthandler;   /* pio - pc8 */
 101        _ramvec[vba+CPMVEC_PIO_PC7]     = inthandler;  /* pio - pc7 */
 102        _ramvec[vba+CPMVEC_PIO_PC6]     = inthandler;  /* pio - pc6 */
 103        _ramvec[vba+CPMVEC_TIMER3]      = inthandler;  /* timer 3 */
 104        _ramvec[vba+CPMVEC_PIO_PC5]     = inthandler;  /* pio - pc5 */
 105        _ramvec[vba+CPMVEC_PIO_PC4]     = inthandler;  /* pio - pc4 */
 106        _ramvec[vba+CPMVEC_RESERVED2]   = inthandler;  /* reserved */
 107        _ramvec[vba+CPMVEC_RISCTIMER]   = inthandler;  /* timer table */
 108        _ramvec[vba+CPMVEC_TIMER2]      = inthandler;  /* timer 2 */
 109        _ramvec[vba+CPMVEC_RESERVED3]   = inthandler;  /* reserved */
 110        _ramvec[vba+CPMVEC_IDMA2]       = inthandler;  /* idma 2 */
 111        _ramvec[vba+CPMVEC_IDMA1]       = inthandler;  /* idma 1 */
 112        _ramvec[vba+CPMVEC_SDMA_CB_ERR] = inthandler;  /* sdma channel bus error */
 113        _ramvec[vba+CPMVEC_PIO_PC3]     = inthandler;  /* pio - pc3 */
 114        _ramvec[vba+CPMVEC_PIO_PC2]     = inthandler;  /* pio - pc2 */
 115        /* _ramvec[vba+CPMVEC_TIMER1]      = cpm_isr_timer1; */  /* timer 1 */
 116        _ramvec[vba+CPMVEC_TIMER1]      = inthandler;  /* timer 1 */
 117        _ramvec[vba+CPMVEC_PIO_PC1]     = inthandler;  /* pio - pc1 */
 118        _ramvec[vba+CPMVEC_SCC4]        = inthandler;  /* scc 4 */
 119        _ramvec[vba+CPMVEC_SCC3]        = inthandler;  /* scc 3 */
 120        _ramvec[vba+CPMVEC_SCC2]        = inthandler;  /* scc 2 */
 121        _ramvec[vba+CPMVEC_SCC1]        = inthandler;  /* scc 1 */
 122        _ramvec[vba+CPMVEC_PIO_PC0]     = inthandler;  /* pio - pc0 */
 123
 124
 125        /* turn off all CPM interrupts */
 126        pquicc->intr_cimr = 0x00000000;
 127}
 128
 129void init_IRQ(void)
 130{
 131        int i;
 132
 133        for (i = 0; (i < NR_IRQS); i++) {
 134                irq_set_chip(i, &intc_irq_chip);
 135                irq_set_handler(i, handle_level_irq);
 136        }
 137}
 138
 139