SAN People | 73a59c1 | 2006-01-09 17:05:41 +0000 | [diff] [blame] | 1 | /* |
Andrew Victor | 9d04126 | 2007-02-05 11:42:07 +0100 | [diff] [blame] | 2 | * linux/arch/arm/mach-at91/irq.c |
SAN People | 73a59c1 | 2006-01-09 17:05:41 +0000 | [diff] [blame] | 3 | * |
| 4 | * Copyright (C) 2004 SAN People |
| 5 | * Copyright (C) 2004 ATMEL |
| 6 | * Copyright (C) Rick Bronson |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2 of the License, or |
| 11 | * (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to the Free Software |
| 20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 21 | */ |
| 22 | |
SAN People | 73a59c1 | 2006-01-09 17:05:41 +0000 | [diff] [blame] | 23 | #include <linux/init.h> |
| 24 | #include <linux/module.h> |
| 25 | #include <linux/mm.h> |
| 26 | #include <linux/types.h> |
| 27 | |
| 28 | #include <asm/hardware.h> |
| 29 | #include <asm/irq.h> |
| 30 | #include <asm/mach-types.h> |
| 31 | #include <asm/setup.h> |
| 32 | |
| 33 | #include <asm/mach/arch.h> |
| 34 | #include <asm/mach/irq.h> |
| 35 | #include <asm/mach/map.h> |
| 36 | |
SAN People | 73a59c1 | 2006-01-09 17:05:41 +0000 | [diff] [blame] | 37 | |
Andrew Victor | ba854e1 | 2006-07-05 17:22:52 +0100 | [diff] [blame] | 38 | static void at91_aic_mask_irq(unsigned int irq) |
SAN People | 73a59c1 | 2006-01-09 17:05:41 +0000 | [diff] [blame] | 39 | { |
| 40 | /* Disable interrupt on AIC */ |
| 41 | at91_sys_write(AT91_AIC_IDCR, 1 << irq); |
| 42 | } |
| 43 | |
Andrew Victor | ba854e1 | 2006-07-05 17:22:52 +0100 | [diff] [blame] | 44 | static void at91_aic_unmask_irq(unsigned int irq) |
SAN People | 73a59c1 | 2006-01-09 17:05:41 +0000 | [diff] [blame] | 45 | { |
| 46 | /* Enable interrupt on AIC */ |
| 47 | at91_sys_write(AT91_AIC_IECR, 1 << irq); |
| 48 | } |
| 49 | |
Andrew Victor | 1f4fd0a | 2006-11-30 10:01:47 +0100 | [diff] [blame] | 50 | unsigned int at91_extern_irq; |
| 51 | |
| 52 | #define is_extern_irq(irq) ((1 << (irq)) & at91_extern_irq) |
| 53 | |
Andrew Victor | ba854e1 | 2006-07-05 17:22:52 +0100 | [diff] [blame] | 54 | static int at91_aic_set_type(unsigned irq, unsigned type) |
SAN People | 73a59c1 | 2006-01-09 17:05:41 +0000 | [diff] [blame] | 55 | { |
| 56 | unsigned int smr, srctype; |
| 57 | |
SAN People | 73a59c1 | 2006-01-09 17:05:41 +0000 | [diff] [blame] | 58 | switch (type) { |
| 59 | case IRQT_HIGH: |
| 60 | srctype = AT91_AIC_SRCTYPE_HIGH; |
| 61 | break; |
| 62 | case IRQT_RISING: |
| 63 | srctype = AT91_AIC_SRCTYPE_RISING; |
| 64 | break; |
| 65 | case IRQT_LOW: |
Andrew Victor | 1f4fd0a | 2006-11-30 10:01:47 +0100 | [diff] [blame] | 66 | if ((irq == AT91_ID_FIQ) || is_extern_irq(irq)) /* only supported on external interrupts */ |
| 67 | srctype = AT91_AIC_SRCTYPE_LOW; |
| 68 | else |
Andrew Victor | 37f2e4b | 2006-06-19 15:26:52 +0100 | [diff] [blame] | 69 | return -EINVAL; |
SAN People | 73a59c1 | 2006-01-09 17:05:41 +0000 | [diff] [blame] | 70 | break; |
| 71 | case IRQT_FALLING: |
Andrew Victor | 1f4fd0a | 2006-11-30 10:01:47 +0100 | [diff] [blame] | 72 | if ((irq == AT91_ID_FIQ) || is_extern_irq(irq)) /* only supported on external interrupts */ |
| 73 | srctype = AT91_AIC_SRCTYPE_FALLING; |
| 74 | else |
Andrew Victor | 37f2e4b | 2006-06-19 15:26:52 +0100 | [diff] [blame] | 75 | return -EINVAL; |
SAN People | 73a59c1 | 2006-01-09 17:05:41 +0000 | [diff] [blame] | 76 | break; |
| 77 | default: |
| 78 | return -EINVAL; |
| 79 | } |
| 80 | |
| 81 | smr = at91_sys_read(AT91_AIC_SMR(irq)) & ~AT91_AIC_SRCTYPE; |
| 82 | at91_sys_write(AT91_AIC_SMR(irq), smr | srctype); |
| 83 | return 0; |
| 84 | } |
| 85 | |
Andrew Victor | 683c66b | 2006-06-19 15:26:53 +0100 | [diff] [blame] | 86 | #ifdef CONFIG_PM |
| 87 | |
| 88 | static u32 wakeups; |
| 89 | static u32 backups; |
| 90 | |
Andrew Victor | ba854e1 | 2006-07-05 17:22:52 +0100 | [diff] [blame] | 91 | static int at91_aic_set_wake(unsigned irq, unsigned value) |
Andrew Victor | 683c66b | 2006-06-19 15:26:53 +0100 | [diff] [blame] | 92 | { |
| 93 | if (unlikely(irq >= 32)) |
| 94 | return -EINVAL; |
| 95 | |
| 96 | if (value) |
| 97 | wakeups |= (1 << irq); |
| 98 | else |
| 99 | wakeups &= ~(1 << irq); |
| 100 | |
| 101 | return 0; |
| 102 | } |
| 103 | |
| 104 | void at91_irq_suspend(void) |
| 105 | { |
| 106 | backups = at91_sys_read(AT91_AIC_IMR); |
| 107 | at91_sys_write(AT91_AIC_IDCR, backups); |
| 108 | at91_sys_write(AT91_AIC_IECR, wakeups); |
| 109 | } |
| 110 | |
| 111 | void at91_irq_resume(void) |
| 112 | { |
| 113 | at91_sys_write(AT91_AIC_IDCR, wakeups); |
| 114 | at91_sys_write(AT91_AIC_IECR, backups); |
| 115 | } |
| 116 | |
| 117 | #else |
Andrew Victor | ba854e1 | 2006-07-05 17:22:52 +0100 | [diff] [blame] | 118 | #define at91_aic_set_wake NULL |
Andrew Victor | 683c66b | 2006-06-19 15:26:53 +0100 | [diff] [blame] | 119 | #endif |
| 120 | |
David Brownell | 38c677c | 2006-08-01 22:26:25 +0100 | [diff] [blame] | 121 | static struct irq_chip at91_aic_chip = { |
| 122 | .name = "AIC", |
Andrew Victor | ba854e1 | 2006-07-05 17:22:52 +0100 | [diff] [blame] | 123 | .ack = at91_aic_mask_irq, |
| 124 | .mask = at91_aic_mask_irq, |
| 125 | .unmask = at91_aic_unmask_irq, |
| 126 | .set_type = at91_aic_set_type, |
| 127 | .set_wake = at91_aic_set_wake, |
SAN People | 73a59c1 | 2006-01-09 17:05:41 +0000 | [diff] [blame] | 128 | }; |
| 129 | |
| 130 | /* |
| 131 | * Initialize the AIC interrupt controller. |
| 132 | */ |
Andrew Victor | ba854e1 | 2006-07-05 17:22:52 +0100 | [diff] [blame] | 133 | void __init at91_aic_init(unsigned int priority[NR_AIC_IRQS]) |
SAN People | 73a59c1 | 2006-01-09 17:05:41 +0000 | [diff] [blame] | 134 | { |
| 135 | unsigned int i; |
| 136 | |
SAN People | 73a59c1 | 2006-01-09 17:05:41 +0000 | [diff] [blame] | 137 | /* |
| 138 | * The IVR is used by macro get_irqnr_and_base to read and verify. |
| 139 | * The irq number is NR_AIC_IRQS when a spurious interrupt has occurred. |
| 140 | */ |
| 141 | for (i = 0; i < NR_AIC_IRQS; i++) { |
| 142 | /* Put irq number in Source Vector Register: */ |
| 143 | at91_sys_write(AT91_AIC_SVR(i), i); |
Andrew Victor | ba854e1 | 2006-07-05 17:22:52 +0100 | [diff] [blame] | 144 | /* Active Low interrupt, with the specified priority */ |
SAN People | 73a59c1 | 2006-01-09 17:05:41 +0000 | [diff] [blame] | 145 | at91_sys_write(AT91_AIC_SMR(i), AT91_AIC_SRCTYPE_LOW | priority[i]); |
| 146 | |
Andrew Victor | ba854e1 | 2006-07-05 17:22:52 +0100 | [diff] [blame] | 147 | set_irq_chip(i, &at91_aic_chip); |
Russell King | 10dd5ce | 2006-11-23 11:41:32 +0000 | [diff] [blame] | 148 | set_irq_handler(i, handle_level_irq); |
SAN People | 73a59c1 | 2006-01-09 17:05:41 +0000 | [diff] [blame] | 149 | set_irq_flags(i, IRQF_VALID | IRQF_PROBE); |
| 150 | |
| 151 | /* Perform 8 End Of Interrupt Command to make sure AIC will not Lock out nIRQ */ |
| 152 | if (i < 8) |
| 153 | at91_sys_write(AT91_AIC_EOICR, 0); |
| 154 | } |
| 155 | |
| 156 | /* |
| 157 | * Spurious Interrupt ID in Spurious Vector Register is NR_AIC_IRQS |
| 158 | * When there is no current interrupt, the IRQ Vector Register reads the value stored in AIC_SPU |
| 159 | */ |
| 160 | at91_sys_write(AT91_AIC_SPU, NR_AIC_IRQS); |
| 161 | |
| 162 | /* No debugging in AIC: Debug (Protect) Control Register */ |
| 163 | at91_sys_write(AT91_AIC_DCR, 0); |
| 164 | |
| 165 | /* Disable and clear all interrupts initially */ |
| 166 | at91_sys_write(AT91_AIC_IDCR, 0xFFFFFFFF); |
| 167 | at91_sys_write(AT91_AIC_ICCR, 0xFFFFFFFF); |
| 168 | } |