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/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); 121