2 * linux/arch/arm/mach-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>
18 #include <linux/irq.h>
21 /* selected INTC register offsets */
23 #define INTC_REVISION 0x0000
24 #define INTC_SYSCONFIG 0x0010
25 #define INTC_SYSSTATUS 0x0014
26 #define INTC_CONTROL 0x0048
27 #define INTC_MIR_CLEAR0 0x0088
28 #define INTC_MIR_SET0 0x008c
31 * OMAP2 has a number of different interrupt controllers, each interrupt
32 * controller is identified as its own "bank". Register definitions are
33 * fairly consistent for each bank, but not all registers are implemented
34 * for each bank.. when in doubt, consult the TRM.
36 static struct omap_irq_bank {
37 unsigned long base_reg;
39 } __attribute__ ((aligned(4))) irq_banks[] = {
47 /* INTC bank register get/set */
49 static void intc_bank_write_reg(u32 val, struct omap_irq_bank *bank, u16 reg)
51 pr_debug("intc_write_reg: writing 0x%0x to 0x%0x\n", val,
52 (__force u32)(bank->base_reg + reg));
54 omap_writel(val, bank->base_reg + reg);
57 static u32 intc_bank_read_reg(struct omap_irq_bank *bank, u16 reg)
59 return omap_readl(bank->base_reg + reg);
62 /* XXX: FIQ and additional INTC support (only MPU at the moment) */
63 static void omap_ack_irq(unsigned int irq)
65 intc_bank_write_reg(0x1, &irq_banks[0], INTC_CONTROL);
68 static void omap_mask_irq(unsigned int irq)
70 int offset = (irq >> 5) << 5;
77 intc_bank_write_reg(1 << irq, &irq_banks[0], INTC_MIR_SET0 + offset);
80 static void omap_unmask_irq(unsigned int irq)
82 int offset = (irq >> 5) << 5;
89 intc_bank_write_reg(1 << irq, &irq_banks[0], INTC_MIR_CLEAR0 + offset);
92 static void omap_mask_ack_irq(unsigned int irq)
98 static struct irq_chip omap_irq_chip = {
100 .ack = omap_mask_ack_irq,
101 .mask = omap_mask_irq,
102 .unmask = omap_unmask_irq,
105 static void __init omap_irq_bank_init_one(struct omap_irq_bank *bank)
109 tmp = intc_bank_read_reg(bank, INTC_REVISION) & 0xff;
110 printk(KERN_INFO "IRQ: Found an INTC at 0x%08lx "
111 "(revision %ld.%ld) with %d interrupts\n",
112 bank->base_reg, tmp >> 4, tmp & 0xf, bank->nr_irqs);
114 tmp = intc_bank_read_reg(bank, INTC_SYSCONFIG);
115 tmp |= 1 << 1; /* soft reset */
116 intc_bank_write_reg(tmp, bank, INTC_SYSCONFIG);
118 while (!(intc_bank_read_reg(bank, INTC_SYSSTATUS) & 0x1))
119 /* Wait for reset to complete */;
121 /* Enable autoidle */
122 intc_bank_write_reg(1 << 0, bank, INTC_SYSCONFIG);
125 void __init omap_init_irq(void)
127 unsigned long nr_irqs = 0;
128 unsigned int nr_banks = 0;
131 for (i = 0; i < ARRAY_SIZE(irq_banks); i++) {
132 struct omap_irq_bank *bank = irq_banks + i;
134 if (cpu_is_omap24xx())
135 bank->base_reg = OMAP24XX_IC_BASE;
136 else if (cpu_is_omap34xx())
137 bank->base_reg = OMAP34XX_IC_BASE;
139 omap_irq_bank_init_one(bank);
141 nr_irqs += bank->nr_irqs;
145 printk(KERN_INFO "Total of %ld interrupts on %d active controller%s\n",
146 nr_irqs, nr_banks, nr_banks > 1 ? "s" : "");
148 for (i = 0; i < nr_irqs; i++) {
149 set_irq_chip(i, &omap_irq_chip);
150 set_irq_handler(i, handle_level_irq);
151 set_irq_flags(i, IRQF_VALID);