mirror of https://gitee.com/openkylin/linux.git
127 lines
2.9 KiB
C
127 lines
2.9 KiB
C
/* linux/arch/arm/mach-s3c2440/irq.c
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*
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* Copyright (c) 2003,2004 Simtec Electronics
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* Ben Dooks <ben@simtec.co.uk>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/ioport.h>
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#include <linux/sysdev.h>
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#include <linux/io.h>
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#include <mach/hardware.h>
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#include <asm/irq.h>
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#include <asm/mach/irq.h>
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#include <mach/regs-irq.h>
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#include <mach/regs-gpio.h>
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#include <plat/cpu.h>
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#include <plat/pm.h>
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#include <plat/irq.h>
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/* WDT/AC97 */
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static void s3c_irq_demux_wdtac97(unsigned int irq,
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struct irq_desc *desc)
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{
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unsigned int subsrc, submsk;
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/* read the current pending interrupts, and the mask
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* for what it is available */
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subsrc = __raw_readl(S3C2410_SUBSRCPND);
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submsk = __raw_readl(S3C2410_INTSUBMSK);
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subsrc &= ~submsk;
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subsrc >>= 13;
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subsrc &= 3;
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if (subsrc != 0) {
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if (subsrc & 1) {
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generic_handle_irq(IRQ_S3C2440_WDT);
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}
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if (subsrc & 2) {
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generic_handle_irq(IRQ_S3C2440_AC97);
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}
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}
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}
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#define INTMSK_WDT (1UL << (IRQ_WDT - IRQ_EINT0))
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static void
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s3c_irq_wdtac97_mask(unsigned int irqno)
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{
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s3c_irqsub_mask(irqno, INTMSK_WDT, 3<<13);
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}
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static void
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s3c_irq_wdtac97_unmask(unsigned int irqno)
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{
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s3c_irqsub_unmask(irqno, INTMSK_WDT);
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}
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static void
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s3c_irq_wdtac97_ack(unsigned int irqno)
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{
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s3c_irqsub_maskack(irqno, INTMSK_WDT, 3<<13);
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}
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static struct irq_chip s3c_irq_wdtac97 = {
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.mask = s3c_irq_wdtac97_mask,
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.unmask = s3c_irq_wdtac97_unmask,
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.ack = s3c_irq_wdtac97_ack,
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};
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static int s3c2440_irq_add(struct sys_device *sysdev)
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{
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unsigned int irqno;
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printk("S3C2440: IRQ Support\n");
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/* add new chained handler for wdt, ac7 */
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set_irq_chip(IRQ_WDT, &s3c_irq_level_chip);
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set_irq_handler(IRQ_WDT, handle_level_irq);
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set_irq_chained_handler(IRQ_WDT, s3c_irq_demux_wdtac97);
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for (irqno = IRQ_S3C2440_WDT; irqno <= IRQ_S3C2440_AC97; irqno++) {
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set_irq_chip(irqno, &s3c_irq_wdtac97);
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set_irq_handler(irqno, handle_level_irq);
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set_irq_flags(irqno, IRQF_VALID);
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}
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return 0;
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}
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static struct sysdev_driver s3c2440_irq_driver = {
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.add = s3c2440_irq_add,
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};
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static int s3c2440_irq_init(void)
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{
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return sysdev_driver_register(&s3c2440_sysclass, &s3c2440_irq_driver);
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}
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arch_initcall(s3c2440_irq_init);
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