arch/arm/mach-pxa/irq.c

   1 /*
   2  *  linux/arch/arm/mach-pxa/irq.c
   3  *
   4  *  Generic PXA IRQ handling
   5  *
   6  *  Author:     Nicolas Pitre
   7  *  Created:    Jun 15, 2001
   8  *  Copyright:  MontaVista Software Inc.
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License version 2 as
  12  *  published by the Free Software Foundation.
  13  */
  14
  15 #include <linux/init.h>
  16 #include <linux/module.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/sysdev.h>
  19
  20 #include <mach/hardware.h>
  21 #include <asm/irq.h>
  22 #include <asm/mach/irq.h>
  23 #include <mach/gpio.h>
  24 #include <mach/regs-intc.h>
  25
  26 #include "generic.h"
  27
  28 #define IRQ_BIT(n)      (((n) - PXA_IRQ(0)) & 0x1f)
  29 #define _ICMR(n)        (*((((n) - PXA_IRQ(0)) & ~0x1f) ? &ICMR2 : &ICMR))
  30 #define _ICLR(n)        (*((((n) - PXA_IRQ(0)) & ~0x1f) ? &ICLR2 : &ICLR))
  31
  32 /*
  33  * This is for peripheral IRQs internal to the PXA chip.
  34  */
  35
  36 static int pxa_internal_irq_nr;
  37
  38 static void pxa_mask_irq(unsigned int irq)
  39 {
  40         _ICMR(irq) &= ~(1 << IRQ_BIT(irq));
  41 }
  42
  43 static void pxa_unmask_irq(unsigned int irq)
  44 {
  45         _ICMR(irq) |= 1 << IRQ_BIT(irq);
  46 }
  47
  48 static struct irq_chip pxa_internal_irq_chip = {
  49         .name           = "SC",
  50         .ack            = pxa_mask_irq,
  51         .mask           = pxa_mask_irq,
  52         .unmask         = pxa_unmask_irq,
  53 };
  54
  55 /*
  56  * GPIO IRQs for GPIO 0 and 1
  57  */
  58 static int pxa_set_low_gpio_type(unsigned int irq, unsigned int type)
  59 {
  60         int gpio = irq - IRQ_GPIO0;
  61
  62         if (__gpio_is_occupied(gpio)) {
  63                 pr_err("%s failed: GPIO is configured\n", __func__);
  64                 return -EINVAL;
  65         }
  66
  67         if (type & IRQ_TYPE_EDGE_RISING)
  68                 GRER0 |= GPIO_bit(gpio);
  69         else
  70                 GRER0 &= ~GPIO_bit(gpio);
  71
  72         if (type & IRQ_TYPE_EDGE_FALLING)
  73                 GFER0 |= GPIO_bit(gpio);
  74         else
  75                 GFER0 &= ~GPIO_bit(gpio);
  76
  77         return 0;
  78 }
  79
  80 static void pxa_ack_low_gpio(unsigned int irq)
  81 {
  82         GEDR0 = (1 << (irq - IRQ_GPIO0));
  83 }
  84
  85 static void pxa_mask_low_gpio(unsigned int irq)
  86 {
  87         ICMR &= ~(1 << (irq - PXA_IRQ(0)));
  88 }
  89
  90 static void pxa_unmask_low_gpio(unsigned int irq)
  91 {
  92         ICMR |= 1 << (irq - PXA_IRQ(0));
  93 }
  94
  95 static struct irq_chip pxa_low_gpio_chip = {
  96         .name           = "GPIO-l",
  97         .ack            = pxa_ack_low_gpio,
  98         .mask           = pxa_mask_low_gpio,
  99         .unmask         = pxa_unmask_low_gpio,
 100         .set_type       = pxa_set_low_gpio_type,
 101 };
 102
 103 static void __init pxa_init_low_gpio_irq(set_wake_t fn)
 104 {
 105         int irq;
 106
 107         /* clear edge detection on GPIO 0 and 1 */
 108         GFER0 &= ~0x3;
 109         GRER0 &= ~0x3;
 110         GEDR0 = 0x3;
 111
 112         for (irq = IRQ_GPIO0; irq <= IRQ_GPIO1; irq++) {
 113                 set_irq_chip(irq, &pxa_low_gpio_chip);
 114                 set_irq_handler(irq, handle_edge_irq);
 115                 set_irq_flags(irq, IRQF_VALID);
 116         }
 117
 118         pxa_low_gpio_chip.set_wake = fn;
 119 }
 120
 121 void __init pxa_init_irq(int irq_nr, set_wake_t fn)
 122 {
 123         int irq;
 124
 125         pxa_internal_irq_nr = irq_nr;
 126
 127         for (irq = PXA_IRQ(0); irq < PXA_IRQ(irq_nr); irq += 32) {
 128                 _ICMR(irq) = 0; /* disable all IRQs */
 129                 _ICLR(irq) = 0; /* all IRQs are IRQ, not FIQ */
 130         }
 131
 132         /* only unmasked interrupts kick us out of idle */
 133         ICCR = 1;
 134
 135         for (irq = PXA_IRQ(0); irq < PXA_IRQ(irq_nr); irq++) {
 136                 set_irq_chip(irq, &pxa_internal_irq_chip);
 137                 set_irq_handler(irq, handle_level_irq);
 138                 set_irq_flags(irq, IRQF_VALID);
 139         }
 140
 141         pxa_internal_irq_chip.set_wake = fn;
 142         pxa_init_low_gpio_irq(fn);
 143 }
 144
 145 #ifdef CONFIG_PM
 146 static unsigned long saved_icmr[2];
 147
 148 static int pxa_irq_suspend(struct sys_device *dev, pm_message_t state)
 149 {
 150         int i, irq = PXA_IRQ(0);
 151
 152         for (i = 0; irq < PXA_IRQ(pxa_internal_irq_nr); i++, irq += 32) {
 153                 saved_icmr[i] = _ICMR(irq);
 154                 _ICMR(irq) = 0;
 155         }
 156
 157         return 0;
 158 }
 159
 160 static int pxa_irq_resume(struct sys_device *dev)
 161 {
 162         int i, irq = PXA_IRQ(0);
 163
 164         for (i = 0; irq < PXA_IRQ(pxa_internal_irq_nr); i++, irq += 32) {
 165                 _ICMR(irq) = saved_icmr[i];
 166                 _ICLR(irq) = 0;
 167         }
 168
 169         ICCR = 1;
 170         return 0;
 171 }
 172 #else
 173 #define pxa_irq_suspend         NULL
 174 #define pxa_irq_resume          NULL
 175 #endif
 176
 177 struct sysdev_class pxa_irq_sysclass = {
 178         .name           = "irq",
 179         .suspend        = pxa_irq_suspend,
 180         .resume         = pxa_irq_resume,
 181 };
 182
 183 static int __init pxa_irq_init(void)
 184 {
 185         return sysdev_class_register(&pxa_irq_sysclass);
 186 }
 187
 188 core_initcall(pxa_irq_init);