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 #include <asm/arch/pxa2xx-gpio.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 void __init pxa_init_irq(int irq_nr, set_wake_t fn) 56 { 57 int irq; 58 59 pxa_internal_irq_nr = irq_nr; 60 61 for (irq = 0; irq < irq_nr; irq += 32) { 62 _ICMR(irq) = 0; /* disable all IRQs */ 63 _ICLR(irq) = 0; /* all IRQs are IRQ, not FIQ */ 64 } 65 66 /* only unmasked interrupts kick us out of idle */ 67 ICCR = 1; 68 69 for (irq = PXA_IRQ(0); irq < PXA_IRQ(irq_nr); irq++) { 70 set_irq_chip(irq, &pxa_internal_irq_chip); 71 set_irq_handler(irq, handle_level_irq); 72 set_irq_flags(irq, IRQF_VALID); 73 } 74 75 pxa_internal_irq_chip.set_wake = fn; 76 } 77 78 #ifdef CONFIG_PM 79 static unsigned long saved_icmr[2]; 80 81 static int pxa_irq_suspend(struct sys_device *dev, pm_message_t state) 82 { 83 int i, irq = PXA_IRQ(0); 84 85 for (i = 0; irq < PXA_IRQ(pxa_internal_irq_nr); i++, irq += 32) { 86 saved_icmr[i] = _ICMR(irq); 87 _ICMR(irq) = 0; 88 } 89 90 return 0; 91 } 92 93 static int pxa_irq_resume(struct sys_device *dev) 94 { 95 int i, irq = PXA_IRQ(0); 96 97 for (i = 0; irq < PXA_IRQ(pxa_internal_irq_nr); i++, irq += 32) { 98 _ICMR(irq) = saved_icmr[i]; 99 _ICLR(irq) = 0; 100 } 101 102 ICCR = 1; 103 return 0; 104 } 105 #else 106 #define pxa_irq_suspend NULL 107 #define pxa_irq_resume NULL 108 #endif 109 110 struct sysdev_class pxa_irq_sysclass = { 111 .name = "irq", 112 .suspend = pxa_irq_suspend, 113 .resume = pxa_irq_resume, 114 }; 115 116 static int __init pxa_irq_init(void) 117 { 118 return sysdev_class_register(&pxa_irq_sysclass); 119 } 120 121 core_initcall(pxa_irq_init); 122