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irq.c
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irq.c
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/* linux/arch/arm/mach-wpcm450/irq.c
*
* Copyright (c) 2006 Winbond 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
*
* Changelog:
*
* 21-Aug-2006 shirley yu <clyu2@winbond.com>
* add wpcm450 platform supporting
*
*/
#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 "cpu.h"
#include "pm.h"
#define irqdbf(x...) //printk(x...)
#define irqdbf2(x...) //printk(x...)
static void
wpcm_irq_mask(unsigned int irqno)
{
unsigned long mask;
mask = 1UL << irqno;
__raw_writel(mask, WPCM450_AIC_MDCR);
}
static inline void
wpcm_irq_ack(unsigned int irqno)
{
// if(irqno == IRQ_TIMER0)
// __raw_writel(0x01, WPCM450_TISR); /* clear TIF0 */
__raw_writel(0x01, WPCM450_AIC_EOSCR);
}
static inline void
wpcm_irq_maskack(unsigned int irqno)
{
__raw_writel(1 << irqno, WPCM450_AIC_SCCR); //edge trigger clear
}
static void
wpcm_irq_unmask(unsigned int irqno)
{
unsigned long mask;
if (irqno == IRQ_TIMER0)
{
__raw_writel(7<<16 | __raw_readl(WPCM450_AIC_GEN), WPCM450_AIC_GEN);
//__raw_writel(7<<16, WPCM450_AIC_GEN);
__raw_writel (1<<IRQ_T_INT_GROUP, WPCM450_AIC_MECR);
}
mask = (1UL << irqno);
__raw_writel(mask, WPCM450_AIC_MECR);
}
struct irqchip wpcm_irq_edge_chip = {
.ack = wpcm_irq_maskack,
.mask = wpcm_irq_mask,
.unmask = wpcm_irq_unmask,
.set_wake = NULL
};
static struct irqchip wpcm_irq_chip = {
.ack = wpcm_irq_ack,
.mask = wpcm_irq_mask,
.unmask = wpcm_irq_unmask,
.set_wake = NULL
};
/* wpcm450_init_irq
*
* Initialise WPCM450 IRQ system
*/
void __init wpcm450_init_irq(void)
{
unsigned long pend;
unsigned long last;
int irqno;
int i;
__raw_writel(0xFFFFFFFE, WPCM450_AIC_MDCR); /* disable all interrupts */
/* register the main interrupts */
irqdbf("wpcm450_init_irq: registering wpcm_0 interrupt handlers\n");
for (irqno = IRQ_WDT; irqno <= IRQ_ADC; irqno++) {
/* set all the wpcm450 internal irqs */
switch (irqno) {
/* deal with the special IRQs (cascaded) */
case IRQ_UART0:
case IRQ_TIMER0:
set_irq_chip(irqno, &wpcm_irq_chip);
set_irq_handler(irqno, do_level_IRQ);
set_irq_flags(irqno, IRQF_VALID);
break;
default:
//irqdbf("registering irq %d (wpcm_irq)\n", irqno);
set_irq_chip(irqno, &wpcm_irq_chip);
set_irq_handler(irqno, do_level_IRQ);
set_irq_flags(irqno, IRQF_VALID);
}
}
irqdbf("wpcm450: registered interrupt handlers\n");
}