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/*
* linux/arch/arm/mach-at91rm9200/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/config.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/types.h>
#include <asm/hardware.h>
#include <asm/irq.h>
#include <asm/mach-types.h>
#include <asm/setup.h>
#include <asm/mach/arch.h>
#include <asm/mach/irq.h>
#include <asm/mach/map.h>
#include "generic.h"
/*
* The default interrupt priority levels (0 = lowest, 7 = highest).
*/
static unsigned int at91rm9200_default_irq_priority[NR_AIC_IRQS] __initdata = {
7, /* Advanced Interrupt Controller */
7, /* System Peripheral */
0, /* Parallel IO Controller A */
0, /* Parallel IO Controller B */
0, /* Parallel IO Controller C */
0, /* Parallel IO Controller D */
6, /* USART 0 */
6, /* USART 1 */
6, /* USART 2 */
6, /* USART 3 */
0, /* Multimedia Card Interface */
4, /* USB Device Port */
0, /* Two-Wire Interface */
6, /* Serial Peripheral Interface */
5, /* Serial Synchronous Controller */
5, /* Serial Synchronous Controller */
5, /* Serial Synchronous Controller */
0, /* Timer Counter 0 */
0, /* Timer Counter 1 */
0, /* Timer Counter 2 */
0, /* Timer Counter 3 */
0, /* Timer Counter 4 */
0, /* Timer Counter 5 */
3, /* USB Host port */
3, /* Ethernet MAC */
0, /* Advanced Interrupt Controller */
0, /* Advanced Interrupt Controller */
0, /* Advanced Interrupt Controller */
0, /* Advanced Interrupt Controller */
0, /* Advanced Interrupt Controller */
0, /* Advanced Interrupt Controller */
0 /* Advanced Interrupt Controller */
};
static void at91rm9200_mask_irq(unsigned int irq)
{
/* Disable interrupt on AIC */
at91_sys_write(AT91_AIC_IDCR, 1 << irq);
}
static void at91rm9200_unmask_irq(unsigned int irq)
{
/* Enable interrupt on AIC */
at91_sys_write(AT91_AIC_IECR, 1 << irq);
}
static int at91rm9200_irq_type(unsigned irq, unsigned type)
{
unsigned int smr, srctype;
switch (type) {
case IRQT_HIGH:
srctype = AT91_AIC_SRCTYPE_HIGH;
break;
case IRQT_RISING:
srctype = AT91_AIC_SRCTYPE_RISING;
break;
case IRQT_LOW:
if ((irq > AT91_ID_FIQ) && (irq < AT91_ID_IRQ0)) /* only supported on external interrupts */
return -EINVAL;
srctype = AT91_AIC_SRCTYPE_LOW;
break;
case IRQT_FALLING:
if ((irq > AT91_ID_FIQ) && (irq < AT91_ID_IRQ0)) /* only supported on external interrupts */
return -EINVAL;
srctype = AT91_AIC_SRCTYPE_FALLING;
break;
default:
return -EINVAL;
}
smr = at91_sys_read(AT91_AIC_SMR(irq)) & ~AT91_AIC_SRCTYPE;
at91_sys_write(AT91_AIC_SMR(irq), smr | srctype);
return 0;
}
static struct irqchip at91rm9200_irq_chip = {
.ack = at91rm9200_mask_irq,
.mask = at91rm9200_mask_irq,
.unmask = at91rm9200_unmask_irq,
.set_type = at91rm9200_irq_type,
};
/*
* Initialize the AIC interrupt controller.
*/
void __init at91rm9200_init_irq(unsigned int priority[NR_AIC_IRQS])
{
unsigned int i;
/* No priority list specified for this board -> use defaults */
if (priority == NULL)
priority = at91rm9200_default_irq_priority;
/*
* 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);
/* Store the Source Mode Register as defined in table above */
at91_sys_write(AT91_AIC_SMR(i), AT91_AIC_SRCTYPE_LOW | priority[i]);
set_irq_chip(i, &at91rm9200_irq_chip);
set_irq_handler(i, do_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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