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/*
* linux/arch/arm/mach-at91/irq.c
*
* Copyright (C) 2004 SAN People
* Copyright (C) 2004 ATMEL
* Copyright (C) Rick Bronson
*
* 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/mm.h>
#include <linux/types.h>
#include <mach/hardware.h>
#include <asm/irq.h>
#include <asm/setup.h>
#include <asm/mach/arch.h>
#include <asm/mach/irq.h>
#include <asm/mach/map.h>
static void at91_aic_mask_irq(struct irq_data *d)
{
/* Disable interrupt on AIC */
at91_sys_write(AT91_AIC_IDCR, 1 << d->irq);
}
static void at91_aic_unmask_irq(struct irq_data *d)
{
/* Enable interrupt on AIC */
at91_sys_write(AT91_AIC_IECR, 1 << d->irq);
}
unsigned int at91_extern_irq;
#define is_extern_irq(irq) ((1 << (irq)) & at91_extern_irq)
static int at91_aic_set_type(struct irq_data *d, unsigned type)
{
unsigned int smr, srctype;
switch (type) {
case IRQ_TYPE_LEVEL_HIGH:
srctype = AT91_AIC_SRCTYPE_HIGH;
break;
case IRQ_TYPE_EDGE_RISING:
srctype = AT91_AIC_SRCTYPE_RISING;
break;
case IRQ_TYPE_LEVEL_LOW:
if ((d->irq == AT91_ID_FIQ) || is_extern_irq(d->irq)) /* only supported on external interrupts */
srctype = AT91_AIC_SRCTYPE_LOW;
else
return -EINVAL;
break;
case IRQ_TYPE_EDGE_FALLING:
if ((d->irq == AT91_ID_FIQ) || is_extern_irq(d->irq)) /* only supported on external interrupts */
srctype = AT91_AIC_SRCTYPE_FALLING;
else
return -EINVAL;
break;
default:
return -EINVAL;
}
smr = at91_sys_read(AT91_AIC_SMR(d->irq)) & ~AT91_AIC_SRCTYPE;
at91_sys_write(AT91_AIC_SMR(d->irq), smr | srctype);
return 0;
}
#ifdef CONFIG_PM
static u32 wakeups;
static u32 backups;
static int at91_aic_set_wake(struct irq_data *d, unsigned value)
{
if (unlikely(d->irq >= 32))
return -EINVAL;
if (value)
wakeups |= (1 << d->irq);
else
wakeups &= ~(1 << d->irq);
return 0;
}
void at91_irq_suspend(void)
{
backups = at91_sys_read(AT91_AIC_IMR);
at91_sys_write(AT91_AIC_IDCR, backups);
at91_sys_write(AT91_AIC_IECR, wakeups);
}
void at91_irq_resume(void)
{
at91_sys_write(AT91_AIC_IDCR, wakeups);
at91_sys_write(AT91_AIC_IECR, backups);
}
#else
#define at91_aic_set_wake NULL
#endif
static struct irq_chip at91_aic_chip = {
.name = "AIC",
.irq_ack = at91_aic_mask_irq,
.irq_mask = at91_aic_mask_irq,
.irq_unmask = at91_aic_unmask_irq,
.irq_set_type = at91_aic_set_type,
.irq_set_wake = at91_aic_set_wake,
};
/*
* Initialize the AIC interrupt controller.
*/
void __init at91_aic_init(unsigned int priority[NR_AIC_IRQS])
{
unsigned int i;
/*
* The IVR is used by macro get_irqnr_and_base to read and verify.
* The irq number is NR_AIC_IRQS when a spurious interrupt has occurred.
*/
for (i = 0; i < NR_AIC_IRQS; i++) {
/* Put irq number in Source Vector Register: */
at91_sys_write(AT91_AIC_SVR(i), i);
/* Active Low interrupt, with the specified priority */
at91_sys_write(AT91_AIC_SMR(i), AT91_AIC_SRCTYPE_LOW | priority[i]);
set_irq_chip(i, &at91_aic_chip);
set_irq_handler(i, handle_level_irq);
set_irq_flags(i, IRQF_VALID | IRQF_PROBE);
/* Perform 8 End Of Interrupt Command to make sure AIC will not Lock out nIRQ */
if (i < 8)
at91_sys_write(AT91_AIC_EOICR, 0);
}
/*
* Spurious Interrupt ID in Spurious Vector Register is NR_AIC_IRQS
* When there is no current interrupt, the IRQ Vector Register reads the value stored in AIC_SPU
*/
at91_sys_write(AT91_AIC_SPU, NR_AIC_IRQS);
/* No debugging in AIC: Debug (Protect) Control Register */
at91_sys_write(AT91_AIC_DCR, 0);
/* Disable and clear all interrupts initially */
at91_sys_write(AT91_AIC_IDCR, 0xFFFFFFFF);
at91_sys_write(AT91_AIC_ICCR, 0xFFFFFFFF);
}
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