2 * linux/arch/arm/mach-omap/irq.c
4 * Interrupt handler for all OMAP boards
6 * Copyright (C) 2004 Nokia Corporation
7 * Written by Tony Lindgren <tony@atomide.com>
8 * Major cleanups by Juha Yrjölä <juha.yrjola@nokia.com>
10 * Completely re-written to support various OMAP chips with bank specific
13 * Some snippets of the code taken from the older OMAP interrupt handler
14 * Copyright (C) 2001 RidgeRun, Inc. Greg Lonnon <glonnon@ridgerun.com>
16 * GPIO interrupt handler moved to gpio.c by Juha Yrjola
18 * This program is free software; you can redistribute it and/or modify it
19 * under the terms of the GNU General Public License as published by the
20 * Free Software Foundation; either version 2 of the License, or (at your
21 * option) any later version.
23 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
24 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
26 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
28 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
29 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
30 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
32 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 * You should have received a copy of the GNU General Public License along
35 * with this program; if not, write to the Free Software Foundation, Inc.,
36 * 675 Mass Ave, Cambridge, MA 02139, USA.
39 #include <linux/config.h>
40 #include <linux/init.h>
41 #include <linux/module.h>
42 #include <linux/sched.h>
43 #include <linux/interrupt.h>
44 #include <linux/ptrace.h>
46 #include <asm/hardware.h>
48 #include <asm/mach/irq.h>
49 #include <asm/arch/gpio.h>
53 #define IRQ_BANK(irq) ((irq) >> 5)
54 #define IRQ_BIT(irq) ((irq) & 0x1f)
56 struct omap_irq_bank {
57 unsigned long base_reg;
58 unsigned long trigger_map;
59 unsigned long wake_enable;
62 static unsigned int irq_bank_count = 0;
63 static struct omap_irq_bank *irq_banks;
65 static inline unsigned int irq_bank_readl(int bank, int offset)
67 return omap_readl(irq_banks[bank].base_reg + offset);
70 static inline void irq_bank_writel(unsigned long value, int bank, int offset)
72 omap_writel(value, irq_banks[bank].base_reg + offset);
75 static void omap_ack_irq(unsigned int irq)
78 omap_writel(0x1, OMAP_IH2_BASE + IRQ_CONTROL_REG_OFFSET);
80 omap_writel(0x1, OMAP_IH1_BASE + IRQ_CONTROL_REG_OFFSET);
83 static void omap_mask_irq(unsigned int irq)
85 int bank = IRQ_BANK(irq);
88 l = omap_readl(irq_banks[bank].base_reg + IRQ_MIR_REG_OFFSET);
89 l |= 1 << IRQ_BIT(irq);
90 omap_writel(l, irq_banks[bank].base_reg + IRQ_MIR_REG_OFFSET);
93 static void omap_unmask_irq(unsigned int irq)
95 int bank = IRQ_BANK(irq);
98 l = omap_readl(irq_banks[bank].base_reg + IRQ_MIR_REG_OFFSET);
99 l &= ~(1 << IRQ_BIT(irq));
100 omap_writel(l, irq_banks[bank].base_reg + IRQ_MIR_REG_OFFSET);
103 static void omap_mask_ack_irq(unsigned int irq)
109 static int omap_wake_irq(unsigned int irq, unsigned int enable)
111 int bank = IRQ_BANK(irq);
114 irq_banks[bank].wake_enable |= IRQ_BIT(irq);
116 irq_banks[bank].wake_enable &= ~IRQ_BIT(irq);
123 * Allows tuning the IRQ type and priority
125 * NOTE: There is currently no OMAP fiq handler for Linux. Read the
126 * mailing list threads on FIQ handlers if you are planning to
127 * add a FIQ handler for OMAP.
129 static void omap_irq_set_cfg(int irq, int fiq, int priority, int trigger)
132 unsigned long val, offset;
134 bank = IRQ_BANK(irq);
135 /* FIQ is only available on bank 0 interrupts */
136 fiq = bank ? 0 : (fiq & 0x1);
137 val = fiq | ((priority & 0x1f) << 2) | ((trigger & 0x1) << 1);
138 offset = IRQ_ILR0_REG_OFFSET + IRQ_BIT(irq) * 0x4;
139 irq_bank_writel(val, bank, offset);
142 #ifdef CONFIG_ARCH_OMAP730
143 static struct omap_irq_bank omap730_irq_banks[] = {
144 { .base_reg = OMAP_IH1_BASE, .trigger_map = 0xb3f8e22f },
145 { .base_reg = OMAP_IH2_BASE, .trigger_map = 0xfdb9c1f2 },
146 { .base_reg = OMAP_IH2_BASE + 0x100, .trigger_map = 0x800040f3 },
150 #ifdef CONFIG_ARCH_OMAP1510
151 static struct omap_irq_bank omap1510_irq_banks[] = {
152 { .base_reg = OMAP_IH1_BASE, .trigger_map = 0xb3febfff },
153 { .base_reg = OMAP_IH2_BASE, .trigger_map = 0xffbfffed },
157 #if defined(CONFIG_ARCH_OMAP16XX)
159 static struct omap_irq_bank omap1610_irq_banks[] = {
160 { .base_reg = OMAP_IH1_BASE, .trigger_map = 0xb3fefe8f },
161 { .base_reg = OMAP_IH2_BASE, .trigger_map = 0xfdb7c1fd },
162 { .base_reg = OMAP_IH2_BASE + 0x100, .trigger_map = 0xffffb7ff },
163 { .base_reg = OMAP_IH2_BASE + 0x200, .trigger_map = 0xffffffff },
167 static struct irqchip omap_irq_chip = {
168 .ack = omap_mask_ack_irq,
169 .mask = omap_mask_irq,
170 .unmask = omap_unmask_irq,
171 .set_wake = omap_wake_irq,
174 void __init omap_init_irq(void)
178 #ifdef CONFIG_ARCH_OMAP730
179 if (cpu_is_omap730()) {
180 irq_banks = omap730_irq_banks;
181 irq_bank_count = ARRAY_SIZE(omap730_irq_banks);
184 #ifdef CONFIG_ARCH_OMAP1510
185 if (cpu_is_omap1510()) {
186 irq_banks = omap1510_irq_banks;
187 irq_bank_count = ARRAY_SIZE(omap1510_irq_banks);
190 #if defined(CONFIG_ARCH_OMAP16XX)
191 if (cpu_is_omap16xx()) {
192 irq_banks = omap1610_irq_banks;
193 irq_bank_count = ARRAY_SIZE(omap1610_irq_banks);
196 printk("Total of %i interrupts in %i interrupt banks\n",
197 irq_bank_count * 32, irq_bank_count);
199 /* Mask and clear all interrupts */
200 for (i = 0; i < irq_bank_count; i++) {
201 irq_bank_writel(~0x0, i, IRQ_MIR_REG_OFFSET);
202 irq_bank_writel(0x0, i, IRQ_ITR_REG_OFFSET);
205 /* Clear any pending interrupts */
206 irq_bank_writel(0x03, 0, IRQ_CONTROL_REG_OFFSET);
207 irq_bank_writel(0x03, 1, IRQ_CONTROL_REG_OFFSET);
209 /* Enable interrupts in global mask */
210 if (cpu_is_omap730()) {
211 irq_bank_writel(0x0, 0, IRQ_GMR_REG_OFFSET);
214 /* Install the interrupt handlers for each bank */
215 for (i = 0; i < irq_bank_count; i++) {
216 for (j = i * 32; j < (i + 1) * 32; j++) {
219 irq_trigger = irq_banks[i].trigger_map >> IRQ_BIT(j);
220 omap_irq_set_cfg(j, 0, 0, irq_trigger);
222 set_irq_chip(j, &omap_irq_chip);
223 set_irq_handler(j, do_level_IRQ);
224 set_irq_flags(j, IRQF_VALID);
228 /* Unmask level 2 handler */
229 if (cpu_is_omap730()) {
230 omap_unmask_irq(INT_730_IH2_IRQ);
232 omap_unmask_irq(INT_IH2_IRQ);