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 #define IRQ_BIT(n)      (((n) - PXA_IRQ(0)) & 0x1f)
  28 #define _ICMR(n)        (*((((n) - PXA_IRQ(0)) & ~0x1f) ? &ICMR2 : &ICMR))
  29 #define _ICLR(n)        (*((((n) - PXA_IRQ(0)) & ~0x1f) ? &ICLR2 : &ICLR))
  30
  31 /*
  32  * This is for peripheral IRQs internal to the PXA chip.
  33  */
  34
  35 static int pxa_internal_irq_nr;
  36
  37 static void pxa_mask_irq(unsigned int irq)
  38 {
  39         _ICMR(irq) &= ~(1 << IRQ_BIT(irq));
  40 }
  41
  42 static void pxa_unmask_irq(unsigned int irq)
  43 {
  44         _ICMR(irq) |= 1 << IRQ_BIT(irq);
  45 }
  46
  47 static struct irq_chip pxa_internal_irq_chip = {
  48         .name           = "SC",
  49         .ack            = pxa_mask_irq,
  50         .mask           = pxa_mask_irq,
  51         .unmask         = pxa_unmask_irq,
  52 };
  53
  54 void __init pxa_init_irq(int irq_nr, set_wake_t fn)
  55 {
  56         int irq;
  57
  58         pxa_internal_irq_nr = irq_nr;
  59
  60         for (irq = 0; irq < irq_nr; irq += 32) {
  61                 _ICMR(irq) = 0; /* disable all IRQs */
  62                 _ICLR(irq) = 0; /* all IRQs are IRQ, not FIQ */
  63         }
  64
  65         /* only unmasked interrupts kick us out of idle */
  66         ICCR = 1;
  67
  68         for (irq = PXA_IRQ(0); irq < PXA_IRQ(irq_nr); irq++) {
  69                 set_irq_chip(irq, &pxa_internal_irq_chip);
  70                 set_irq_handler(irq, handle_level_irq);
  71                 set_irq_flags(irq, IRQF_VALID);
  72         }
  73
  74         pxa_internal_irq_chip.set_wake = fn;
  75 }
  76
  77 #ifdef CONFIG_PM
  78 static unsigned long saved_icmr[2];
  79
  80 static int pxa_irq_suspend(struct sys_device *dev, pm_message_t state)
  81 {
  82         int i, irq = PXA_IRQ(0);
  83
  84         for (i = 0; irq < PXA_IRQ(pxa_internal_irq_nr); i++, irq += 32) {
  85                 saved_icmr[i] = _ICMR(irq);
  86                 _ICMR(irq) = 0;
  87         }
  88
  89         return 0;
  90 }
  91
  92 static int pxa_irq_resume(struct sys_device *dev)
  93 {
  94         int i, irq = PXA_IRQ(0);
  95
  96         for (i = 0; irq < PXA_IRQ(pxa_internal_irq_nr); i++, irq += 32) {
  97                 _ICMR(irq) = saved_icmr[i];
  98                 _ICLR(irq) = 0;
  99         }
 100
 101         ICCR = 1;
 102         return 0;
 103 }
 104 #else
 105 #define pxa_irq_suspend         NULL
 106 #define pxa_irq_resume          NULL
 107 #endif
 108
 109 struct sysdev_class pxa_irq_sysclass = {
 110         .name           = "irq",
 111         .suspend        = pxa_irq_suspend,
 112         .resume         = pxa_irq_resume,
 113 };
 114
 115 static int __init pxa_irq_init(void)
 116 {
 117         return sysdev_class_register(&pxa_irq_sysclass);
 118 }
 119
 120 core_initcall(pxa_irq_init);