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