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/* linux/arch/arm/mach-s3c2443/irq.c
*
* Copyright (c) 2007 Simtec Electronics
* Ben Dooks <ben@simtec.co.uk>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/ptrace.h>
#include <linux/sysdev.h>
#include <asm/hardware.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <asm/mach/irq.h>
#include <asm/arch/regs-irq.h>
#include <asm/arch/regs-gpio.h>
#include <asm/plat-s3c24xx/cpu.h>
#include <asm/plat-s3c24xx/pm.h>
#include <asm/plat-s3c24xx/irq.h>
/* WDT/AC97 */
static void s3c_irq_demux_wdtac97(unsigned int irq,
struct irq_desc *desc)
{
unsigned int subsrc, submsk;
struct irq_desc *mydesc;
/* read the current pending interrupts, and the mask
* for what it is available */
subsrc = __raw_readl(S3C2410_SUBSRCPND);
submsk = __raw_readl(S3C2410_INTSUBMSK);
subsrc &= ~submsk;
subsrc >>= 27;
subsrc &= 3;
if (subsrc != 0) {
if (subsrc & 1) {
mydesc = irq_desc + IRQ_S3C2443_WDT;
desc_handle_irq(IRQ_S3C2443_WDT, mydesc);
}
if (subsrc & 2) {
mydesc = irq_desc + IRQ_S3C2443_AC97;
desc_handle_irq(IRQ_S3C2443_AC97, mydesc);
}
}
}
#define INTMSK_WDT (1UL << (IRQ_WDT - IRQ_EINT0))
static void
s3c_irq_wdtac97_mask(unsigned int irqno)
{
s3c_irqsub_mask(irqno, INTMSK_WDT, 3<<27);
}
static void
s3c_irq_wdtac97_unmask(unsigned int irqno)
{
s3c_irqsub_unmask(irqno, INTMSK_WDT);
}
static void
s3c_irq_wdtac97_ack(unsigned int irqno)
{
s3c_irqsub_maskack(irqno, INTMSK_WDT, 3<<27);
}
static struct irq_chip s3c_irq_wdtac97 = {
.mask = s3c_irq_wdtac97_mask,
.unmask = s3c_irq_wdtac97_unmask,
.ack = s3c_irq_wdtac97_ack,
};
static int s3c2443_irq_add(struct sys_device *sysdev)
{
unsigned int irqno;
printk("S3C2443: IRQ Support\n");
/* add new chained handler for wdt, ac7 */
set_irq_chip(IRQ_WDT, &s3c_irq_level_chip);
set_irq_handler(IRQ_WDT, handle_level_irq);
set_irq_chained_handler(IRQ_WDT, s3c_irq_demux_wdtac97);
for (irqno = IRQ_S3C2443_WDT; irqno <= IRQ_S3C2443_AC97; irqno++) {
set_irq_chip(irqno, &s3c_irq_wdtac97);
set_irq_handler(irqno, handle_level_irq);
set_irq_flags(irqno, IRQF_VALID);
}
return 0;
}
static struct sysdev_driver s3c2443_irq_driver = {
.add = s3c2443_irq_add,
};
static int s3c2443_irq_init(void)
{
return sysdev_driver_register(&s3c2443_sysclass, &s3c2443_irq_driver);
}
arch_initcall(s3c2443_irq_init);
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