arch/arm/mach-omap/irq.c

   1 /*
   2  * linux/arch/arm/mach-omap/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/config.h>
  40 #include <linux/init.h>
  41 #include <linux/module.h>
  42 #include <linux/sched.h>
  43 #include <linux/interrupt.h>
  44 #include <linux/ptrace.h>
  45
  46 #include <asm/hardware.h>
  47 #include <asm/irq.h>
  48 #include <asm/mach/irq.h>
  49 #include <asm/arch/gpio.h>
  50
  51 #include <asm/io.h>
  52
  53 #define IRQ_BANK(irq) ((irq) >> 5)
  54 #define IRQ_BIT(irq)  ((irq) & 0x1f)
  55
  56 struct omap_irq_bank {
  57         unsigned long base_reg;
  58         unsigned long trigger_map;
  59 };
  60
  61 static unsigned int irq_bank_count = 0;
  62 static struct omap_irq_bank *irq_banks;
  63
  64 static inline unsigned int irq_bank_readl(int bank, int offset)
  65 {
  66         return omap_readl(irq_banks[bank].base_reg + offset);
  67 }
  68
  69 static inline void irq_bank_writel(unsigned long value, int bank, int offset)
  70 {
  71         omap_writel(value, irq_banks[bank].base_reg + offset);
  72 }
  73
  74 static void omap_ack_irq(unsigned int irq)
  75 {
  76         if (irq > 31)
  77                 omap_writel(0x1, OMAP_IH2_BASE + IRQ_CONTROL_REG_OFFSET);
  78
  79         omap_writel(0x1, OMAP_IH1_BASE + IRQ_CONTROL_REG_OFFSET);
  80 }
  81
  82 static void omap_mask_irq(unsigned int irq)
  83 {
  84         int bank = IRQ_BANK(irq);
  85         u32 l;
  86
  87         l = omap_readl(irq_banks[bank].base_reg + IRQ_MIR_REG_OFFSET);
  88         l |= 1 << IRQ_BIT(irq);
  89         omap_writel(l, irq_banks[bank].base_reg + IRQ_MIR_REG_OFFSET);
  90 }
  91
  92 static void omap_unmask_irq(unsigned int irq)
  93 {
  94         int bank = IRQ_BANK(irq);
  95         u32 l;
  96
  97         l = omap_readl(irq_banks[bank].base_reg + IRQ_MIR_REG_OFFSET);
  98         l &= ~(1 << IRQ_BIT(irq));
  99         omap_writel(l, irq_banks[bank].base_reg + IRQ_MIR_REG_OFFSET);
 100 }
 101
 102 static void omap_mask_ack_irq(unsigned int irq)
 103 {
 104         omap_mask_irq(irq);
 105         omap_ack_irq(irq);
 106 }
 107
 108 /*
 109  * Allows tuning the IRQ type and priority
 110  *
 111  * NOTE: There is currently no OMAP fiq handler for Linux. Read the
 112  *       mailing list threads on FIQ handlers if you are planning to
 113  *       add a FIQ handler for OMAP.
 114  */
 115 static void omap_irq_set_cfg(int irq, int fiq, int priority, int trigger)
 116 {
 117         signed int bank;
 118         unsigned long val, offset;
 119
 120         bank = IRQ_BANK(irq);
 121         /* FIQ is only available on bank 0 interrupts */
 122         fiq = bank ? 0 : (fiq & 0x1);
 123         val = fiq | ((priority & 0x1f) << 2) | ((trigger & 0x1) << 1);
 124         offset = IRQ_ILR0_REG_OFFSET + IRQ_BIT(irq) * 0x4;
 125         irq_bank_writel(val, bank, offset);
 126 }
 127
 128 #ifdef CONFIG_ARCH_OMAP730
 129 static struct omap_irq_bank omap730_irq_banks[] = {
 130         { .base_reg = OMAP_IH1_BASE,            .trigger_map = 0xb3f8e22f },
 131         { .base_reg = OMAP_IH2_BASE,            .trigger_map = 0xfdb9c1f2 },
 132         { .base_reg = OMAP_IH2_BASE + 0x100,    .trigger_map = 0x800040f3 },
 133 };
 134 #endif
 135
 136 #ifdef CONFIG_ARCH_OMAP1510
 137 static struct omap_irq_bank omap1510_irq_banks[] = {
 138         { .base_reg = OMAP_IH1_BASE,            .trigger_map = 0xb3febfff },
 139         { .base_reg = OMAP_IH2_BASE,            .trigger_map = 0xffbfffed },
 140 };
 141 #endif
 142
 143 #if defined(CONFIG_ARCH_OMAP16XX)
 144
 145 static struct omap_irq_bank omap1610_irq_banks[] = {
 146         { .base_reg = OMAP_IH1_BASE,            .trigger_map = 0xb3fefe8f },
 147         { .base_reg = OMAP_IH2_BASE,            .trigger_map = 0xfdb7c1fd },
 148         { .base_reg = OMAP_IH2_BASE + 0x100,    .trigger_map = 0xfffff7ff },
 149         { .base_reg = OMAP_IH2_BASE + 0x200,    .trigger_map = 0xffffffff },
 150 };
 151 #endif
 152
 153 static struct irqchip omap_irq_chip = {
 154         .ack    = omap_mask_ack_irq,
 155         .mask   = omap_mask_irq,
 156         .unmask = omap_unmask_irq,
 157 };
 158
 159 void __init omap_init_irq(void)
 160 {
 161         int i, j;
 162
 163 #ifdef CONFIG_ARCH_OMAP730
 164         if (cpu_is_omap730()) {
 165                 irq_banks = omap730_irq_banks;
 166                 irq_bank_count = ARRAY_SIZE(omap730_irq_banks);
 167         }
 168 #endif
 169 #ifdef CONFIG_ARCH_OMAP1510
 170         if (cpu_is_omap1510()) {
 171                 irq_banks = omap1510_irq_banks;
 172                 irq_bank_count = ARRAY_SIZE(omap1510_irq_banks);
 173         }
 174 #endif
 175 #if defined(CONFIG_ARCH_OMAP16XX)
 176         if (cpu_is_omap16xx()) {
 177                 irq_banks = omap1610_irq_banks;
 178                 irq_bank_count = ARRAY_SIZE(omap1610_irq_banks);
 179         }
 180 #endif
 181         printk("Total of %i interrupts in %i interrupt banks\n",
 182                irq_bank_count * 32, irq_bank_count);
 183
 184         /* Mask and clear all interrupts */
 185         for (i = 0; i < irq_bank_count; i++) {
 186                 irq_bank_writel(~0x0, i, IRQ_MIR_REG_OFFSET);
 187                 irq_bank_writel(0x0, i, IRQ_ITR_REG_OFFSET);
 188         }
 189
 190         /* Clear any pending interrupts */
 191         irq_bank_writel(0x03, 0, IRQ_CONTROL_REG_OFFSET);
 192         irq_bank_writel(0x03, 1, IRQ_CONTROL_REG_OFFSET);
 193
 194         /* Enable interrupts in global mask */
 195         if (cpu_is_omap730()) {
 196                 irq_bank_writel(0x0, 0, IRQ_GMR_REG_OFFSET);
 197         }
 198
 199         /* Install the interrupt handlers for each bank */
 200         for (i = 0; i < irq_bank_count; i++) {
 201                 for (j = i * 32; j < (i + 1) * 32; j++) {
 202                         int irq_trigger;
 203
 204                         irq_trigger = irq_banks[i].trigger_map >> IRQ_BIT(j);
 205                         omap_irq_set_cfg(j, 0, 0, irq_trigger);
 206
 207                         set_irq_chip(j, &omap_irq_chip);
 208                         set_irq_handler(j, do_level_IRQ);
 209                         set_irq_flags(j, IRQF_VALID);
 210                 }
 211         }
 212
 213         /* Unmask level 2 handler */
 214         if (cpu_is_omap730()) {
 215                 omap_unmask_irq(INT_730_IH2_IRQ);
 216         } else {
 217                 omap_unmask_irq(INT_IH2_IRQ);
 218         }
 219 }