/*
* arch/arm/mach-ks8695/irq.c
*
* Copyright (C) 2006 Ben Dooks <ben@simtec.co.uk>
* Copyright (C) 2006 Simtec Electronics
*
* 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/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>
static void ks8695_irq_mask(unsigned int irqno)
{
unsigned long inten;
inten = __raw_readl(KS8695_IRQ_VA + KS8695_INTEN);
inten &= ~(1 << irqno);
__raw_writel(inten, KS8695_IRQ_VA + KS8695_INTEN);
}
static void ks8695_irq_unmask(unsigned int irqno)
{
unsigned long inten;
inten = __raw_readl(KS8695_IRQ_VA + KS8695_INTEN);
inten |= (1 << irqno);
__raw_writel(inten, KS8695_IRQ_VA + KS8695_INTEN);
}
static void ks8695_irq_ack(unsigned int irqno)
{
__raw_writel((1 << irqno), KS8695_IRQ_VA + KS8695_INTST);
}
static struct irq_chip ks8695_irq_level_chip;
static struct irq_chip ks8695_irq_edge_chip;
static int ks8695_irq_set_type(unsigned int irqno, unsigned int type)
{
unsigned long ctrl, mode;
unsigned short level_triggered = 0;
ctrl = __raw_readl(KS8695_GPIO_VA + KS8695_IOPC);
switch (type) {
case IRQT_HIGH:
mode = IOPC_TM_HIGH;
level_triggered = 1;
break;
case IRQT_LOW:
mode = IOPC_TM_LOW;
level_triggered = 1;
break;
case IRQT_RISING:
mode = IOPC_TM_RISING;
break;
case IRQT_FALLING:
mode = IOPC_TM_FALLING;
break;
case IRQT_BOTHEDGE:
mode = IOPC_TM_EDGE;
break;
default:
return -EINVAL;
}
switch (irqno) {
case KS8695_IRQ_EXTERN0:
ctrl &= ~IOPC_IOEINT0TM;
ctrl |= IOPC_IOEINT0_MODE(mode);
break;
case KS8695_IRQ_EXTERN1:
ctrl &= ~IOPC_IOEINT1TM;
ctrl |= IOPC_IOEINT1_MODE(mode);
break;
case KS8695_IRQ_EXTERN2:
ctrl &= ~IOPC_IOEINT2TM;
ctrl |= IOPC_IOEINT2_MODE(mode);
break;
case KS8695_IRQ_EXTERN3:
ctrl &= ~IOPC_IOEINT3TM;
ctrl |= IOPC_IOEINT3_MODE(mode);
break;
default:
return -EINVAL;
}
if (level_triggered) {
set_irq_chip(irqno, &ks8695_irq_level_chip);
set_irq_handler(irqno, handle_level_irq);
}
else {
set_irq_chip(irqno, &ks8695_irq_edge_chip);
set_irq_handler(irqno, handle_edge_irq);
}
__raw_writel(ctrl, KS8695_GPIO_VA + KS8695_IOPC);
return 0;
}
static struct irq_chip ks8695_irq_level_chip = {
.ack = ks8695_irq_mask,
.mask = ks8695_irq_mask,
.unmask = ks8695_irq_unmask,
.set_type = ks8695_irq_set_type,
};
static struct irq_chip ks8695_irq_edge_chip = {
.ack = ks8695_irq_ack,
.mask = ks8695_irq_mask,
.unmask = ks8695_irq_unmask,
.set_type = ks8695_irq_set_type,
};
void __init ks8695_init_irq(void)
{
unsigned int irq;
/* Disable all interrupts initially */
__raw_writel(0, KS8695_IRQ_VA + KS8695_INTMC);
__raw_writel(0, KS8695_IRQ_VA + KS8695_INTEN);
for (irq = 0; irq < NR_IRQS; irq++) {
switch (irq) {
/* Level-triggered interrupts */
case KS8695_IRQ_BUS_ERROR:
case KS8695_IRQ_UART_MODEM_STATUS:
case KS8695_IRQ_UART_LINE_STATUS:
case KS8695_IRQ_UART_RX:
case KS8695_IRQ_COMM_TX:
case KS8695_IRQ_COMM_RX:
set_irq_chip(irq, &ks8695_irq_level_chip);
set_irq_handler(irq, handle_level_irq);
break;
/* Edge-triggered interrupts */
default:
ks8695_irq_ack(irq); /* clear pending bit */
set_irq_chip(irq, &ks8695_irq_edge_chip);
set_irq_handler(irq, handle_edge_irq);
}
set_irq_flags(irq, IRQF_VALID);
}
}
