arch/arm/mach-omap1/irq.c

   1 /*
   2  * linux/arch/arm/mach-omap1/irq.c
   3  *
   4  * Interrupt handler for all OMAP boards
   5  *
   6  * Copyright (C) 2004 Nokia Corporation
   7  * Written by Tony Lindgren <tony@atomide.com>
   8  * Major cleanups by Juha Yrjölä <juha.yrjola@nokia.com>
   9  *
  10  * Completely re-written to support various OMAP chips with bank specific
  11  * interrupt handlers.
  12  *
  13  * Some snippets of the code taken from the older OMAP interrupt handler
  14  * Copyright (C) 2001 RidgeRun, Inc. Greg Lonnon <glonnon@ridgerun.com>
  15  *
  16  * GPIO interrupt handler moved to gpio.c by Juha Yrjola
  17  *
  18  * This program is free software; you can redistribute it and/or modify it
  19  * under the terms of the GNU General Public License as published by the
  20  * Free Software Foundation; either version 2 of the License, or (at your
  21  * option) any later version.
  22  *
  23  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  24  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  25  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
  26  * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  27  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  28  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  29  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  30  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  31  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  32  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  33  *
  34  * You should have received a copy of the  GNU General Public License along
  35  * with this program; if not, write  to the Free Software Foundation, Inc.,
  36  * 675 Mass Ave, Cambridge, MA 02139, USA.
  37  */
  38
  39 #include <linux/init.h>
  40 #include <linux/module.h>
  41 #include <linux/sched.h>
  42 #include <linux/interrupt.h>
  43 #include <linux/io.h>
  44
  45 #include <mach/hardware.h>
  46 #include <asm/irq.h>
  47 #include <asm/mach/irq.h>
  48 #include <mach/gpio.h>
  49 #include <plat/cpu.h>
  50
  51 #define IRQ_BANK(irq) ((irq) >> 5)
  52 #define IRQ_BIT(irq)  ((irq) & 0x1f)
  53
  54 struct omap_irq_bank {
  55         unsigned long base_reg;
  56         unsigned long trigger_map;
  57         unsigned long wake_enable;
  58 };
  59
  60 static unsigned int irq_bank_count;
  61 static struct omap_irq_bank *irq_banks;
  62
  63 static inline unsigned int irq_bank_readl(int bank, int offset)
  64 {
  65         return omap_readl(irq_banks[bank].base_reg + offset);
  66 }
  67
  68 static inline void irq_bank_writel(unsigned long value, int bank, int offset)
  69 {
  70         omap_writel(value, irq_banks[bank].base_reg + offset);
  71 }
  72
  73 static void omap_ack_irq(unsigned int irq)
  74 {
  75         if (irq > 31)
  76                 omap_writel(0x1, OMAP_IH2_BASE + IRQ_CONTROL_REG_OFFSET);
  77
  78         omap_writel(0x1, OMAP_IH1_BASE + IRQ_CONTROL_REG_OFFSET);
  79 }
  80
  81 static void omap_mask_irq(unsigned int irq)
  82 {
  83         int bank = IRQ_BANK(irq);
  84         u32 l;
  85
  86         l = omap_readl(irq_banks[bank].base_reg + IRQ_MIR_REG_OFFSET);
  87         l |= 1 << IRQ_BIT(irq);
  88         omap_writel(l, irq_banks[bank].base_reg + IRQ_MIR_REG_OFFSET);
  89 }
  90
  91 static void omap_unmask_irq(unsigned int irq)
  92 {
  93         int bank = IRQ_BANK(irq);
  94         u32 l;
  95
  96         l = omap_readl(irq_banks[bank].base_reg + IRQ_MIR_REG_OFFSET);
  97         l &= ~(1 << IRQ_BIT(irq));
  98         omap_writel(l, irq_banks[bank].base_reg + IRQ_MIR_REG_OFFSET);
  99 }
 100
 101 static void omap_mask_ack_irq(unsigned int irq)
 102 {
 103         omap_mask_irq(irq);
 104         omap_ack_irq(irq);
 105 }
 106
 107 static int omap_wake_irq(unsigned int irq, unsigned int enable)
 108 {
 109         int bank = IRQ_BANK(irq);
 110
 111         if (enable)
 112                 irq_banks[bank].wake_enable |= IRQ_BIT(irq);
 113         else
 114                 irq_banks[bank].wake_enable &= ~IRQ_BIT(irq);
 115
 116         return 0;
 117 }
 118
 119
 120 /*
 121  * Allows tuning the IRQ type and priority
 122  *
 123  * NOTE: There is currently no OMAP fiq handler for Linux. Read the
 124  *       mailing list threads on FIQ handlers if you are planning to
 125  *       add a FIQ handler for OMAP.
 126  */
 127 static void omap_irq_set_cfg(int irq, int fiq, int priority, int trigger)
 128 {
 129         signed int bank;
 130         unsigned long val, offset;
 131
 132         bank = IRQ_BANK(irq);
 133         /* FIQ is only available on bank 0 interrupts */
 134         fiq = bank ? 0 : (fiq & 0x1);
 135         val = fiq | ((priority & 0x1f) << 2) | ((trigger & 0x1) << 1);
 136         offset = IRQ_ILR0_REG_OFFSET + IRQ_BIT(irq) * 0x4;
 137         irq_bank_writel(val, bank, offset);
 138 }
 139
 140 #if defined (CONFIG_ARCH_OMAP730) || defined (CONFIG_ARCH_OMAP850)
 141 static struct omap_irq_bank omap7xx_irq_banks[] = {
 142         { .base_reg = OMAP_IH1_BASE,            .trigger_map = 0xb3f8e22f },
 143         { .base_reg = OMAP_IH2_BASE,            .trigger_map = 0xfdb9c1f2 },
 144         { .base_reg = OMAP_IH2_BASE + 0x100,    .trigger_map = 0x800040f3 },
 145 };
 146 #endif
 147
 148 #ifdef CONFIG_ARCH_OMAP15XX
 149 static struct omap_irq_bank omap1510_irq_banks[] = {
 150         { .base_reg = OMAP_IH1_BASE,            .trigger_map = 0xb3febfff },
 151         { .base_reg = OMAP_IH2_BASE,            .trigger_map = 0xffbfffed },
 152 };
 153 static struct omap_irq_bank omap310_irq_banks[] = {
 154         { .base_reg = OMAP_IH1_BASE,            .trigger_map = 0xb3faefc3 },
 155         { .base_reg = OMAP_IH2_BASE,            .trigger_map = 0x65b3c061 },
 156 };
 157 #endif
 158
 159 #if defined(CONFIG_ARCH_OMAP16XX)
 160
 161 static struct omap_irq_bank omap1610_irq_banks[] = {
 162         { .base_reg = OMAP_IH1_BASE,            .trigger_map = 0xb3fefe8f },
 163         { .base_reg = OMAP_IH2_BASE,            .trigger_map = 0xfdb7c1fd },
 164         { .base_reg = OMAP_IH2_BASE + 0x100,    .trigger_map = 0xffffb7ff },
 165         { .base_reg = OMAP_IH2_BASE + 0x200,    .trigger_map = 0xffffffff },
 166 };
 167 #endif
 168
 169 static struct irq_chip omap_irq_chip = {
 170         .name           = "MPU",
 171         .ack            = omap_mask_ack_irq,
 172         .mask           = omap_mask_irq,
 173         .unmask         = omap_unmask_irq,
 174         .set_wake       = omap_wake_irq,
 175 };
 176
 177 void __init omap_init_irq(void)
 178 {
 179         int i, j;
 180
 181 #if defined(CONFIG_ARCH_OMAP730) || defined(CONFIG_ARCH_OMAP850)
 182         if (cpu_is_omap7xx()) {
 183                 irq_banks = omap7xx_irq_banks;
 184                 irq_bank_count = ARRAY_SIZE(omap7xx_irq_banks);
 185         }
 186 #endif
 187 #ifdef CONFIG_ARCH_OMAP15XX
 188         if (cpu_is_omap1510()) {
 189                 irq_banks = omap1510_irq_banks;
 190                 irq_bank_count = ARRAY_SIZE(omap1510_irq_banks);
 191         }
 192         if (cpu_is_omap310()) {
 193                 irq_banks = omap310_irq_banks;
 194                 irq_bank_count = ARRAY_SIZE(omap310_irq_banks);
 195         }
 196 #endif
 197 #if defined(CONFIG_ARCH_OMAP16XX)
 198         if (cpu_is_omap16xx()) {
 199                 irq_banks = omap1610_irq_banks;
 200                 irq_bank_count = ARRAY_SIZE(omap1610_irq_banks);
 201         }
 202 #endif
 203         printk("Total of %i interrupts in %i interrupt banks\n",
 204                irq_bank_count * 32, irq_bank_count);
 205
 206         /* Mask and clear all interrupts */
 207         for (i = 0; i < irq_bank_count; i++) {
 208                 irq_bank_writel(~0x0, i, IRQ_MIR_REG_OFFSET);
 209                 irq_bank_writel(0x0, i, IRQ_ITR_REG_OFFSET);
 210         }
 211
 212         /* Clear any pending interrupts */
 213         irq_bank_writel(0x03, 0, IRQ_CONTROL_REG_OFFSET);
 214         irq_bank_writel(0x03, 1, IRQ_CONTROL_REG_OFFSET);
 215
 216         /* Enable interrupts in global mask */
 217         if (cpu_is_omap7xx())
 218                 irq_bank_writel(0x0, 0, IRQ_GMR_REG_OFFSET);
 219
 220         /* Install the interrupt handlers for each bank */
 221         for (i = 0; i < irq_bank_count; i++) {
 222                 for (j = i * 32; j < (i + 1) * 32; j++) {
 223                         int irq_trigger;
 224
 225                         irq_trigger = irq_banks[i].trigger_map >> IRQ_BIT(j);
 226                         omap_irq_set_cfg(j, 0, 0, irq_trigger);
 227
 228                         set_irq_chip(j, &omap_irq_chip);
 229                         set_irq_handler(j, handle_level_irq);
 230                         set_irq_flags(j, IRQF_VALID);
 231                 }
 232         }
 233
 234         /* Unmask level 2 handler */
 235
 236         if (cpu_is_omap7xx())
 237                 omap_unmask_irq(INT_7XX_IH2_IRQ);
 238         else if (cpu_is_omap15xx())
 239                 omap_unmask_irq(INT_1510_IH2_IRQ);
 240         else if (cpu_is_omap16xx())
 241                 omap_unmask_irq(INT_1610_IH2_IRQ);
 242 }