2 * linux/arch/arm/mach-omap/omap2/irq.c
4 * Interrupt handler for OMAP2 boards.
6 * Copyright (C) 2005 Nokia Corporation
7 * Author: Paul Mundt <paul.mundt@nokia.com>
9 * This file is subject to the terms and conditions of the GNU General Public
10 * License. See the file "COPYING" in the main directory of this archive
13 #include <linux/kernel.h>
14 #include <linux/init.h>
15 #include <linux/interrupt.h>
16 #include <asm/hardware.h>
17 #include <asm/mach/irq.h>
21 #define INTC_REVISION 0x0000
22 #define INTC_SYSCONFIG 0x0010
23 #define INTC_SYSSTATUS 0x0014
24 #define INTC_CONTROL 0x0048
25 #define INTC_MIR_CLEAR0 0x0088
26 #define INTC_MIR_SET0 0x008c
29 * OMAP2 has a number of different interrupt controllers, each interrupt
30 * controller is identified as its own "bank". Register definitions are
31 * fairly consistent for each bank, but not all registers are implemented
32 * for each bank.. when in doubt, consult the TRM.
34 static struct omap_irq_bank {
35 unsigned long base_reg;
37 } __attribute__ ((aligned(4))) irq_banks[] = {
40 .base_reg = OMAP24XX_IC_BASE,
47 * Commented out for now until we fix the IVA clocking
49 #ifdef CONFIG_ARCH_OMAP2420
51 /* IVA INTC (2420 only) */
52 .base_reg = OMAP24XX_IVA_INTC_BASE,
53 .nr_irqs = 16, /* Actually 32, but only 16 are used */
59 /* XXX: FIQ and additional INTC support (only MPU at the moment) */
60 static void omap_ack_irq(unsigned int irq)
62 omap_writel(0x1, irq_banks[0].base_reg + INTC_CONTROL);
65 static void omap_mask_irq(unsigned int irq)
67 int offset = (irq >> 5) << 5;
71 } else if (irq >= 32) {
75 omap_writel(1 << irq, irq_banks[0].base_reg + INTC_MIR_SET0 + offset);
78 static void omap_unmask_irq(unsigned int irq)
80 int offset = (irq >> 5) << 5;
84 } else if (irq >= 32) {
88 omap_writel(1 << irq, irq_banks[0].base_reg + INTC_MIR_CLEAR0 + offset);
91 static void omap_mask_ack_irq(unsigned int irq)
97 static struct irq_chip omap_irq_chip = {
99 .ack = omap_mask_ack_irq,
100 .mask = omap_mask_irq,
101 .unmask = omap_unmask_irq,
104 static void __init omap_irq_bank_init_one(struct omap_irq_bank *bank)
108 tmp = omap_readl(bank->base_reg + INTC_REVISION) & 0xff;
109 printk(KERN_INFO "IRQ: Found an INTC at 0x%08lx "
110 "(revision %ld.%ld) with %d interrupts\n",
111 bank->base_reg, tmp >> 4, tmp & 0xf, bank->nr_irqs);
113 tmp = omap_readl(bank->base_reg + INTC_SYSCONFIG);
114 tmp |= 1 << 1; /* soft reset */
115 omap_writel(tmp, bank->base_reg + INTC_SYSCONFIG);
117 while (!(omap_readl(bank->base_reg + INTC_SYSSTATUS) & 0x1))
118 /* Wait for reset to complete */;
121 void __init omap_init_irq(void)
123 unsigned long nr_irqs = 0;
124 unsigned int nr_banks = 0;
127 for (i = 0; i < ARRAY_SIZE(irq_banks); i++) {
128 struct omap_irq_bank *bank = irq_banks + i;
134 omap_irq_bank_init_one(bank);
136 nr_irqs += bank->nr_irqs;
140 printk(KERN_INFO "Total of %ld interrupts on %d active controller%s\n",
141 nr_irqs, nr_banks, nr_banks > 1 ? "s" : "");
143 for (i = 0; i < nr_irqs; i++) {
144 set_irq_chip(i, &omap_irq_chip);
145 set_irq_handler(i, do_level_IRQ);
146 set_irq_flags(i, IRQF_VALID);