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/* linux/arch/arm/mach-s3c2412/s3c2412-irq.c
*
* Copyright (c) 2006 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 "cpu.h"
#include "irq.h"
/* the s3c2412 changes the behaviour of IRQ_EINT0 through IRQ_EINT3 by
* having them turn up in both the INT* and the EINT* registers. Whilst
* both show the status, they both now need to be acked when the IRQs
* go off.
*/
static void
s3c2412_irq_mask(unsigned int irqno)
{
unsigned long bitval = 1UL << (irqno - IRQ_EINT0);
unsigned long mask;
mask = __raw_readl(S3C2410_INTMSK);
__raw_writel(mask | bitval, S3C2410_INTMSK);
mask = __raw_readl(S3C2412_EINTMASK);
__raw_writel(mask | bitval, S3C2412_EINTMASK);
}
static inline void
s3c2412_irq_ack(unsigned int irqno)
{
unsigned long bitval = 1UL << (irqno - IRQ_EINT0);
__raw_writel(bitval, S3C2412_EINTPEND);
__raw_writel(bitval, S3C2410_SRCPND);
__raw_writel(bitval, S3C2410_INTPND);
}
static inline void
s3c2412_irq_maskack(unsigned int irqno)
{
unsigned long bitval = 1UL << (irqno - IRQ_EINT0);
unsigned long mask;
mask = __raw_readl(S3C2410_INTMSK);
__raw_writel(mask|bitval, S3C2410_INTMSK);
mask = __raw_readl(S3C2412_EINTMASK);
__raw_writel(mask | bitval, S3C2412_EINTMASK);
__raw_writel(bitval, S3C2412_EINTPEND);
__raw_writel(bitval, S3C2410_SRCPND);
__raw_writel(bitval, S3C2410_INTPND);
}
static void
s3c2412_irq_unmask(unsigned int irqno)
{
unsigned long bitval = 1UL << (irqno - IRQ_EINT0);
unsigned long mask;
mask = __raw_readl(S3C2412_EINTMASK);
__raw_writel(mask & ~bitval, S3C2412_EINTMASK);
mask = __raw_readl(S3C2410_INTMSK);
__raw_writel(mask & ~bitval, S3C2410_INTMSK);
}
static struct irqchip s3c2412_irq_eint0t4 = {
.ack = s3c2412_irq_ack,
.mask = s3c2412_irq_mask,
.unmask = s3c2412_irq_unmask,
.set_wake = s3c_irq_wake,
.set_type = s3c_irqext_type,
};
static int s3c2412_irq_add(struct sys_device *sysdev)
{
unsigned int irqno;
for (irqno = IRQ_EINT0; irqno <= IRQ_EINT3; irqno++) {
set_irq_chip(irqno, &s3c2412_irq_eint0t4);
set_irq_handler(irqno, do_edge_IRQ);
set_irq_flags(irqno, IRQF_VALID);
}
return 0;
}
static struct sysdev_driver s3c2412_irq_driver = {
.add = s3c2412_irq_add,
};
static int s3c2412_irq_init(void)
{
return sysdev_driver_register(&s3c2412_sysclass, &s3c2412_irq_driver);
}
arch_initcall(s3c2412_irq_init);
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