release/src-rt-6.x.4708/linux/linux-2.6.36/arch/arm/mach-iop13xx/irq.c

   1 /*
   2  * iop13xx IRQ handling / support functions
   3  * Copyright (c) 2005-2006, Intel Corporation.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
  16  * Place - Suite 330, Boston, MA 02111-1307 USA.
  17  *
  18  */
  19 #include <linux/init.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/list.h>
  22 #include <linux/sysctl.h>
  23 #include <asm/uaccess.h>
  24 #include <asm/mach/irq.h>
  25 #include <asm/irq.h>
  26 #include <mach/hardware.h>
  27 #include <mach/irqs.h>
  28 #include <mach/msi.h>
  29
  30 /* INTCTL0 CP6 R0 Page 4
  31  */
  32 static u32 read_intctl_0(void)
  33 {
  34         u32 val;
  35         asm volatile("mrc p6, 0, %0, c0, c4, 0":"=r" (val));
  36         return val;
  37 }
  38 static void write_intctl_0(u32 val)
  39 {
  40         asm volatile("mcr p6, 0, %0, c0, c4, 0"::"r" (val));
  41 }
  42
  43 /* INTCTL1 CP6 R1 Page 4
  44  */
  45 static u32 read_intctl_1(void)
  46 {
  47         u32 val;
  48         asm volatile("mrc p6, 0, %0, c1, c4, 0":"=r" (val));
  49         return val;
  50 }
  51 static void write_intctl_1(u32 val)
  52 {
  53         asm volatile("mcr p6, 0, %0, c1, c4, 0"::"r" (val));
  54 }
  55
  56 /* INTCTL2 CP6 R2 Page 4
  57  */
  58 static u32 read_intctl_2(void)
  59 {
  60         u32 val;
  61         asm volatile("mrc p6, 0, %0, c2, c4, 0":"=r" (val));
  62         return val;
  63 }
  64 static void write_intctl_2(u32 val)
  65 {
  66         asm volatile("mcr p6, 0, %0, c2, c4, 0"::"r" (val));
  67 }
  68
  69 /* INTCTL3 CP6 R3 Page 4
  70  */
  71 static u32 read_intctl_3(void)
  72 {
  73         u32 val;
  74         asm volatile("mrc p6, 0, %0, c3, c4, 0":"=r" (val));
  75         return val;
  76 }
  77 static void write_intctl_3(u32 val)
  78 {
  79         asm volatile("mcr p6, 0, %0, c3, c4, 0"::"r" (val));
  80 }
  81
  82 /* INTSTR0 CP6 R0 Page 5
  83  */
  84 static void write_intstr_0(u32 val)
  85 {
  86         asm volatile("mcr p6, 0, %0, c0, c5, 0"::"r" (val));
  87 }
  88
  89 /* INTSTR1 CP6 R1 Page 5
  90  */
  91 static void write_intstr_1(u32 val)
  92 {
  93         asm volatile("mcr p6, 0, %0, c1, c5, 0"::"r" (val));
  94 }
  95
  96 /* INTSTR2 CP6 R2 Page 5
  97  */
  98 static void write_intstr_2(u32 val)
  99 {
 100         asm volatile("mcr p6, 0, %0, c2, c5, 0"::"r" (val));
 101 }
 102
 103 /* INTSTR3 CP6 R3 Page 5
 104  */
 105 static void write_intstr_3(u32 val)
 106 {
 107         asm volatile("mcr p6, 0, %0, c3, c5, 0"::"r" (val));
 108 }
 109
 110 /* INTBASE CP6 R0 Page 2
 111  */
 112 static void write_intbase(u32 val)
 113 {
 114         asm volatile("mcr p6, 0, %0, c0, c2, 0"::"r" (val));
 115 }
 116
 117 /* INTSIZE CP6 R2 Page 2
 118  */
 119 static void write_intsize(u32 val)
 120 {
 121         asm volatile("mcr p6, 0, %0, c2, c2, 0"::"r" (val));
 122 }
 123
 124 /* 0 = Interrupt Masked and 1 = Interrupt not masked */
 125 static void
 126 iop13xx_irq_mask0 (unsigned int irq)
 127 {
 128         write_intctl_0(read_intctl_0() & ~(1 << (irq - 0)));
 129 }
 130
 131 static void
 132 iop13xx_irq_mask1 (unsigned int irq)
 133 {
 134         write_intctl_1(read_intctl_1() & ~(1 << (irq - 32)));
 135 }
 136
 137 static void
 138 iop13xx_irq_mask2 (unsigned int irq)
 139 {
 140         write_intctl_2(read_intctl_2() & ~(1 << (irq - 64)));
 141 }
 142
 143 static void
 144 iop13xx_irq_mask3 (unsigned int irq)
 145 {
 146         write_intctl_3(read_intctl_3() & ~(1 << (irq - 96)));
 147 }
 148
 149 static void
 150 iop13xx_irq_unmask0(unsigned int irq)
 151 {
 152         write_intctl_0(read_intctl_0() | (1 << (irq - 0)));
 153 }
 154
 155 static void
 156 iop13xx_irq_unmask1(unsigned int irq)
 157 {
 158         write_intctl_1(read_intctl_1() | (1 << (irq - 32)));
 159 }
 160
 161 static void
 162 iop13xx_irq_unmask2(unsigned int irq)
 163 {
 164         write_intctl_2(read_intctl_2() | (1 << (irq - 64)));
 165 }
 166
 167 static void
 168 iop13xx_irq_unmask3(unsigned int irq)
 169 {
 170         write_intctl_3(read_intctl_3() | (1 << (irq - 96)));
 171 }
 172
 173 static struct irq_chip iop13xx_irqchip1 = {
 174         .name   = "IOP13xx-1",
 175         .ack    = iop13xx_irq_mask0,
 176         .mask   = iop13xx_irq_mask0,
 177         .unmask = iop13xx_irq_unmask0,
 178 };
 179
 180 static struct irq_chip iop13xx_irqchip2 = {
 181         .name   = "IOP13xx-2",
 182         .ack    = iop13xx_irq_mask1,
 183         .mask   = iop13xx_irq_mask1,
 184         .unmask = iop13xx_irq_unmask1,
 185 };
 186
 187 static struct irq_chip iop13xx_irqchip3 = {
 188         .name   = "IOP13xx-3",
 189         .ack    = iop13xx_irq_mask2,
 190         .mask   = iop13xx_irq_mask2,
 191         .unmask = iop13xx_irq_unmask2,
 192 };
 193
 194 static struct irq_chip iop13xx_irqchip4 = {
 195         .name   = "IOP13xx-4",
 196         .ack    = iop13xx_irq_mask3,
 197         .mask   = iop13xx_irq_mask3,
 198         .unmask = iop13xx_irq_unmask3,
 199 };
 200
 201 extern void iop_init_cp6_handler(void);
 202
 203 void __init iop13xx_init_irq(void)
 204 {
 205         unsigned int i;
 206
 207         iop_init_cp6_handler();
 208
 209         /* disable all interrupts */
 210         write_intctl_0(0);
 211         write_intctl_1(0);
 212         write_intctl_2(0);
 213         write_intctl_3(0);
 214
 215         /* treat all as IRQ */
 216         write_intstr_0(0);
 217         write_intstr_1(0);
 218         write_intstr_2(0);
 219         write_intstr_3(0);
 220
 221         /* initialize the interrupt vector generator */
 222         write_intbase(INTBASE);
 223         write_intsize(INTSIZE_4);
 224
 225         for(i = 0; i <= IRQ_IOP13XX_HPI; i++) {
 226                 if (i < 32)
 227                         set_irq_chip(i, &iop13xx_irqchip1);
 228                 else if (i < 64)
 229                         set_irq_chip(i, &iop13xx_irqchip2);
 230                 else if (i < 96)
 231                         set_irq_chip(i, &iop13xx_irqchip3);
 232                 else
 233                         set_irq_chip(i, &iop13xx_irqchip4);
 234
 235                 set_irq_handler(i, handle_level_irq);
 236                 set_irq_flags(i, IRQF_VALID | IRQF_PROBE);
 237         }
 238
 239         iop13xx_msi_init();
 240 }