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/*
* linux/arch/arm/mach-omap2/irq.c
*
* Interrupt handler for OMAP2 boards.
*
* Copyright (C) 2005 Nokia Corporation
* Author: Paul Mundt <paul.mundt@nokia.com>
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <asm/hardware.h>
#include <asm/mach/irq.h>
#include <asm/irq.h>
#include <asm/io.h>
#define INTC_REVISION 0x0000
#define INTC_SYSCONFIG 0x0010
#define INTC_SYSSTATUS 0x0014
#define INTC_CONTROL 0x0048
#define INTC_MIR_CLEAR0 0x0088
#define INTC_MIR_SET0 0x008c
/*
* OMAP2 has a number of different interrupt controllers, each interrupt
* controller is identified as its own "bank". Register definitions are
* fairly consistent for each bank, but not all registers are implemented
* for each bank.. when in doubt, consult the TRM.
*/
static struct omap_irq_bank {
unsigned long base_reg;
unsigned int nr_irqs;
} __attribute__ ((aligned(4))) irq_banks[] = {
{
/* MPU INTC */
.base_reg = OMAP24XX_IC_BASE,
.nr_irqs = 96,
}, {
/* XXX: DSP INTC */
}
};
/* XXX: FIQ and additional INTC support (only MPU at the moment) */
static void omap_ack_irq(unsigned int irq)
{
omap_writel(0x1, irq_banks[0].base_reg + INTC_CONTROL);
}
static void omap_mask_irq(unsigned int irq)
{
int offset = (irq >> 5) << 5;
if (irq >= 64) {
irq %= 64;
} else if (irq >= 32) {
irq %= 32;
}
omap_writel(1 << irq, irq_banks[0].base_reg + INTC_MIR_SET0 + offset);
}
static void omap_unmask_irq(unsigned int irq)
{
int offset = (irq >> 5) << 5;
if (irq >= 64) {
irq %= 64;
} else if (irq >= 32) {
irq %= 32;
}
omap_writel(1 << irq, irq_banks[0].base_reg + INTC_MIR_CLEAR0 + offset);
}
static void omap_mask_ack_irq(unsigned int irq)
{
omap_mask_irq(irq);
omap_ack_irq(irq);
}
static struct irq_chip omap_irq_chip = {
.name = "INTC",
.ack = omap_mask_ack_irq,
.mask = omap_mask_irq,
.unmask = omap_unmask_irq,
};
static void __init omap_irq_bank_init_one(struct omap_irq_bank *bank)
{
unsigned long tmp;
tmp = omap_readl(bank->base_reg + INTC_REVISION) & 0xff;
printk(KERN_INFO "IRQ: Found an INTC at 0x%08lx "
"(revision %ld.%ld) with %d interrupts\n",
bank->base_reg, tmp >> 4, tmp & 0xf, bank->nr_irqs);
tmp = omap_readl(bank->base_reg + INTC_SYSCONFIG);
tmp |= 1 << 1; /* soft reset */
omap_writel(tmp, bank->base_reg + INTC_SYSCONFIG);
while (!(omap_readl(bank->base_reg + INTC_SYSSTATUS) & 0x1))
/* Wait for reset to complete */;
}
void __init omap_init_irq(void)
{
unsigned long nr_irqs = 0;
unsigned int nr_banks = 0;
int i;
for (i = 0; i < ARRAY_SIZE(irq_banks); i++) {
struct omap_irq_bank *bank = irq_banks + i;
/* XXX */
if (!bank->base_reg)
continue;
omap_irq_bank_init_one(bank);
nr_irqs += bank->nr_irqs;
nr_banks++;
}
printk(KERN_INFO "Total of %ld interrupts on %d active controller%s\n",
nr_irqs, nr_banks, nr_banks > 1 ? "s" : "");
for (i = 0; i < nr_irqs; i++) {
set_irq_chip(i, &omap_irq_chip);
set_irq_handler(i, handle_level_irq);
set_irq_flags(i, IRQF_VALID);
}
}
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