arch/arm26/machine/irq.c

   1 /*
   2  *  linux/arch/arm26/mach-arc/irq.c
   3  *
   4  *  Copyright (C) 1996 Russell King
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  *  Changelog:
  11  *   24-09-1996 RMK     Created
  12  *   10-10-1996 RMK     Brought up to date with arch-sa110eval
  13  *   22-10-1996 RMK     Changed interrupt numbers & uses new inb/outb macros
  14  *   11-01-1998 RMK     Added mask_and_ack_irq
  15  *   22-08-1998 RMK     Restructured IRQ routines
  16  *   08-09-2002 IM      Brought up to date for 2.5
  17  *   01-06-2003 JMA     Removed arc_fiq_chip
  18  */
  19 #include <linux/config.h>
  20 #include <linux/init.h>
  21
  22 #include <asm/irq.h>
  23 #include <asm/irqchip.h>
  24 #include <asm/ioc.h>
  25 #include <asm/io.h>
  26 #include <asm/system.h>
  27
  28 extern void init_FIQ(void);
  29
  30 #define a_clf() clf()
  31 #define a_stf() stf()
  32
  33 static void arc_ack_irq_a(unsigned int irq)
  34 {
  35         unsigned int val, mask;
  36
  37         mask = 1 << irq;
  38         a_clf();
  39         val = ioc_readb(IOC_IRQMASKA);
  40         ioc_writeb(val & ~mask, IOC_IRQMASKA);
  41         ioc_writeb(mask, IOC_IRQCLRA);
  42         a_stf();
  43 }
  44
  45 static void arc_mask_irq_a(unsigned int irq)
  46 {
  47         unsigned int val, mask;
  48
  49         mask = 1 << irq;
  50         a_clf();
  51         val = ioc_readb(IOC_IRQMASKA);
  52         ioc_writeb(val & ~mask, IOC_IRQMASKA);
  53         a_stf();
  54 }
  55
  56 static void arc_unmask_irq_a(unsigned int irq)
  57 {
  58         unsigned int val, mask;
  59
  60         mask = 1 << irq;
  61         a_clf();
  62         val = ioc_readb(IOC_IRQMASKA);
  63         ioc_writeb(val | mask, IOC_IRQMASKA);
  64         a_stf();
  65 }
  66
  67 static struct irqchip arc_a_chip = {
  68         .ack    = arc_ack_irq_a,
  69         .mask   = arc_mask_irq_a,
  70         .unmask = arc_unmask_irq_a,
  71 };
  72
  73 static void arc_mask_irq_b(unsigned int irq)
  74 {
  75         unsigned int val, mask;
  76         mask = 1 << (irq & 7);
  77         val = ioc_readb(IOC_IRQMASKB);
  78         ioc_writeb(val & ~mask, IOC_IRQMASKB);
  79 }
  80
  81 static void arc_unmask_irq_b(unsigned int irq)
  82 {
  83         unsigned int val, mask;
  84
  85         mask = 1 << (irq & 7);
  86         val = ioc_readb(IOC_IRQMASKB);
  87         ioc_writeb(val | mask, IOC_IRQMASKB);
  88 }
  89
  90 static struct irqchip arc_b_chip = {
  91         .ack    = arc_mask_irq_b,
  92         .mask   = arc_mask_irq_b,
  93         .unmask = arc_unmask_irq_b,
  94 };
  95
  96 /* FIXME - JMA none of these functions are used in arm26 currently
  97 static void arc_mask_irq_fiq(unsigned int irq)
  98 {
  99         unsigned int val, mask;
 100
 101         mask = 1 << (irq & 7);
 102         val = ioc_readb(IOC_FIQMASK);
 103         ioc_writeb(val & ~mask, IOC_FIQMASK);
 104 }
 105
 106 static void arc_unmask_irq_fiq(unsigned int irq)
 107 {
 108         unsigned int val, mask;
 109
 110         mask = 1 << (irq & 7);
 111         val = ioc_readb(IOC_FIQMASK);
 112         ioc_writeb(val | mask, IOC_FIQMASK);
 113 }
 114
 115 static struct irqchip arc_fiq_chip = {
 116         .ack    = arc_mask_irq_fiq,
 117         .mask   = arc_mask_irq_fiq,
 118         .unmask = arc_unmask_irq_fiq,
 119 };
 120 */
 121
 122 void __init arc_init_irq(void)
 123 {
 124         unsigned int irq, flags;
 125
 126         /* Disable all IOC interrupt sources */
 127         ioc_writeb(0, IOC_IRQMASKA);
 128         ioc_writeb(0, IOC_IRQMASKB);
 129         ioc_writeb(0, IOC_FIQMASK);
 130
 131         for (irq = 0; irq < NR_IRQS; irq++) {
 132                 flags = IRQF_VALID;
 133
 134                 if (irq <= 6 || (irq >= 9 && irq <= 15))
 135                         flags |= IRQF_PROBE;
 136
 137                 if (irq == IRQ_KEYBOARDTX)
 138                         flags |= IRQF_NOAUTOEN;
 139
 140                 switch (irq) {
 141                 case 0 ... 7:
 142                         set_irq_chip(irq, &arc_a_chip);
 143                         set_irq_handler(irq, do_level_IRQ);
 144                         set_irq_flags(irq, flags);
 145                         break;
 146
 147                 case 8 ... 15:
 148                         set_irq_chip(irq, &arc_b_chip);
 149                         set_irq_handler(irq, do_level_IRQ);
 150                         set_irq_flags(irq, flags);
 151
 152 /*              case 64 ... 72:
 153                         set_irq_chip(irq, &arc_fiq_chip);
 154                         set_irq_flags(irq, flags);
 155                         break;
 156 */
 157
 158                 }
 159         }
 160
 161         irq_desc[IRQ_KEYBOARDTX].noautoenable = 1;
 162
 163         init_FIQ();
 164 }
 165