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 <asm/hardware.h>
  21 #include <asm/irq.h>
  22 #include <asm/mach/irq.h>
  23 #include <asm/arch/pxa-regs.h>
  24
  25 #include "generic.h"
  26
  27
  28 /*
  29  * This is for peripheral IRQs internal to the PXA chip.
  30  */
  31
  32 static void pxa_mask_low_irq(unsigned int irq)
  33 {
  34         ICMR &= ~(1 << irq);
  35 }
  36
  37 static void pxa_unmask_low_irq(unsigned int irq)
  38 {
  39         ICMR |= (1 << irq);
  40 }
  41
  42 static struct irq_chip pxa_internal_chip_low = {
  43         .name           = "SC",
  44         .ack            = pxa_mask_low_irq,
  45         .mask           = pxa_mask_low_irq,
  46         .unmask         = pxa_unmask_low_irq,
  47 };
  48
  49 void __init pxa_init_irq_low(void)
  50 {
  51         int irq;
  52
  53         /* disable all IRQs */
  54         ICMR = 0;
  55
  56         /* all IRQs are IRQ, not FIQ */
  57         ICLR = 0;
  58
  59         /* only unmasked interrupts kick us out of idle */
  60         ICCR = 1;
  61
  62         for (irq = PXA_IRQ(0); irq <= PXA_IRQ(31); irq++) {
  63                 set_irq_chip(irq, &pxa_internal_chip_low);
  64                 set_irq_handler(irq, handle_level_irq);
  65                 set_irq_flags(irq, IRQF_VALID);
  66         }
  67 }
  68
  69 #if defined(CONFIG_PXA27x) || defined(CONFIG_PXA3xx)
  70
  71 /*
  72  * This is for the second set of internal IRQs as found on the PXA27x.
  73  */
  74
  75 static void pxa_mask_high_irq(unsigned int irq)
  76 {
  77         ICMR2 &= ~(1 << (irq - 32));
  78 }
  79
  80 static void pxa_unmask_high_irq(unsigned int irq)
  81 {
  82         ICMR2 |= (1 << (irq - 32));
  83 }
  84
  85 static struct irq_chip pxa_internal_chip_high = {
  86         .name           = "SC-hi",
  87         .ack            = pxa_mask_high_irq,
  88         .mask           = pxa_mask_high_irq,
  89         .unmask         = pxa_unmask_high_irq,
  90 };
  91
  92 void __init pxa_init_irq_high(void)
  93 {
  94         int irq;
  95
  96         ICMR2 = 0;
  97         ICLR2 = 0;
  98
  99         for (irq = PXA_IRQ(32); irq < PXA_IRQ(64); irq++) {
 100                 set_irq_chip(irq, &pxa_internal_chip_high);
 101                 set_irq_handler(irq, handle_level_irq);
 102                 set_irq_flags(irq, IRQF_VALID);
 103         }
 104 }
 105 #endif
 106
 107 void __init pxa_init_irq_set_wake(int (*set_wake)(unsigned int, unsigned int))
 108 {
 109         pxa_internal_chip_low.set_wake = set_wake;
 110 #ifdef CONFIG_PXA27x
 111         pxa_internal_chip_high.set_wake = set_wake;
 112 #endif
 113         pxa_init_gpio_set_wake(set_wake);
 114 }
 115
 116 #ifdef CONFIG_PM
 117 static unsigned long saved_icmr[2];
 118
 119 static int pxa_irq_suspend(struct sys_device *dev, pm_message_t state)
 120 {
 121         switch (dev->id) {
 122         case 0:
 123                 saved_icmr[0] = ICMR;
 124                 ICMR = 0;
 125                 break;
 126 #if defined(CONFIG_PXA27x) || defined(CONFIG_PXA3xx)
 127         case 1:
 128                 saved_icmr[1] = ICMR2;
 129                 ICMR2 = 0;
 130                 break;
 131 #endif
 132         default:
 133                 return -EINVAL;
 134         }
 135
 136         return 0;
 137 }
 138
 139 static int pxa_irq_resume(struct sys_device *dev)
 140 {
 141         switch (dev->id) {
 142         case 0:
 143                 ICMR = saved_icmr[0];
 144                 ICLR = 0;
 145                 ICCR = 1;
 146                 break;
 147 #if defined(CONFIG_PXA27x) || defined(CONFIG_PXA3xx)
 148         case 1:
 149                 ICMR2 = saved_icmr[1];
 150                 ICLR2 = 0;
 151                 break;
 152 #endif
 153         default:
 154                 return -EINVAL;
 155         }
 156
 157         return 0;
 158 }
 159 #else
 160 #define pxa_irq_suspend         NULL
 161 #define pxa_irq_resume          NULL
 162 #endif
 163
 164 struct sysdev_class pxa_irq_sysclass = {
 165         .name           = "irq",
 166         .suspend        = pxa_irq_suspend,
 167         .resume         = pxa_irq_resume,
 168 };
 169
 170 static int __init pxa_irq_init(void)
 171 {
 172         return sysdev_class_register(&pxa_irq_sysclass);
 173 }
 174
 175 core_initcall(pxa_irq_init);