irq.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:1k
- /*
- * linux/arch/arm/mach-ebsa110/irq.c
- *
- * Copyright (C) 1996-1998 Russell King
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * Changelog:
- * 22-08-1998 RMK Restructured IRQ routines
- */
- #include <linux/init.h>
- #include <asm/mach/irq.h>
- #include <asm/hardware.h>
- #include <asm/io.h>
- #include <asm/irq.h>
- #include <asm/system.h>
- #include "hardware.h"
- static void ebsa110_mask_irq(unsigned int irq)
- {
- __raw_writeb(1 << irq, IRQ_MCLR);
- }
- static void ebsa110_unmask_irq(unsigned int irq)
- {
- __raw_writeb(1 << irq, IRQ_MSET);
- }
-
- void __init ebsa110_init_irq(void)
- {
- unsigned long flags;
- int irq;
- save_flags_cli (flags);
- __raw_writeb(0xff, IRQ_MCLR);
- __raw_writeb(0x55, IRQ_MSET);
- __raw_writeb(0x00, IRQ_MSET);
- if (__raw_readb(IRQ_MASK) != 0x55)
- while (1);
- __raw_writeb(0xff, IRQ_MCLR); /* clear all interrupt enables */
- restore_flags (flags);
- for (irq = 0; irq < NR_IRQS; irq++) {
- irq_desc[irq].valid = 1;
- irq_desc[irq].probe_ok = 1;
- irq_desc[irq].mask_ack = ebsa110_mask_irq;
- irq_desc[irq].mask = ebsa110_mask_irq;
- irq_desc[irq].unmask = ebsa110_unmask_irq;
- }
- }