| wanzongshun | 7ec80dd | 2008-12-03 03:55:38 +0100 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/arm/mach-w90x900/irq.c |
| 3 | * |
| 4 | * based on linux/arch/arm/plat-s3c24xx/irq.c by Ben Dooks |
| 5 | * |
| 6 | * Copyright (c) 2008 Nuvoton technology corporation |
| 7 | * All rights reserved. |
| 8 | * |
| 9 | * Wan ZongShun <mcuos.com@gmail.com> |
| 10 | * |
| 11 | * This program is free software; you can redistribute it and/or modify |
| 12 | * it under the terms of the GNU General Public License as published by |
| 13 | * the Free Software Foundation; either version 2 of the License, or |
| 14 | * (at your option) any later version. |
| 15 | * |
| 16 | */ |
| 17 | |
| 18 | #include <linux/init.h> |
| 19 | #include <linux/module.h> |
| 20 | #include <linux/interrupt.h> |
| 21 | #include <linux/ioport.h> |
| 22 | #include <linux/ptrace.h> |
| 23 | #include <linux/sysdev.h> |
| 24 | #include <linux/io.h> |
| 25 | |
| 26 | #include <asm/irq.h> |
| 27 | #include <asm/mach/irq.h> |
| 28 | |
| 29 | #include <mach/hardware.h> |
| 30 | #include <mach/regs-irq.h> |
| 31 | |
| 32 | static void w90x900_irq_mask(unsigned int irq) |
| 33 | { |
| 34 | __raw_writel(1 << irq, REG_AIC_MDCR); |
| 35 | } |
| 36 | |
| 37 | /* |
| 38 | * By the w90p910 spec,any irq,only write 1 |
| 39 | * to REG_AIC_EOSCR for ACK |
| 40 | */ |
| 41 | |
| 42 | static void w90x900_irq_ack(unsigned int irq) |
| 43 | { |
| 44 | __raw_writel(0x01, REG_AIC_EOSCR); |
| 45 | } |
| 46 | |
| 47 | static void w90x900_irq_unmask(unsigned int irq) |
| 48 | { |
| 49 | unsigned long mask; |
| 50 | |
| 51 | if (irq == IRQ_T_INT_GROUP) { |
| 52 | mask = __raw_readl(REG_AIC_GEN); |
| 53 | __raw_writel(TIME_GROUP_IRQ | mask, REG_AIC_GEN); |
| 54 | __raw_writel(1 << IRQ_T_INT_GROUP, REG_AIC_MECR); |
| 55 | } |
| 56 | __raw_writel(1 << irq, REG_AIC_MECR); |
| 57 | } |
| 58 | |
| 59 | static struct irq_chip w90x900_irq_chip = { |
| 60 | .ack = w90x900_irq_ack, |
| 61 | .mask = w90x900_irq_mask, |
| 62 | .unmask = w90x900_irq_unmask, |
| 63 | }; |
| 64 | |
| 65 | void __init w90x900_init_irq(void) |
| 66 | { |
| 67 | int irqno; |
| 68 | |
| 69 | __raw_writel(0xFFFFFFFE, REG_AIC_MDCR); |
| 70 | |
| 71 | for (irqno = IRQ_WDT; irqno <= IRQ_ADC; irqno++) { |
| 72 | set_irq_chip(irqno, &w90x900_irq_chip); |
| 73 | set_irq_handler(irqno, handle_level_irq); |
| 74 | set_irq_flags(irqno, IRQF_VALID); |
| 75 | } |
| 76 | } |