Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/kernel/irq/chip.c |
| 3 | * |
| 4 | * Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar |
| 5 | * Copyright (C) 2005-2006, Thomas Gleixner, Russell King |
| 6 | * |
| 7 | * This file contains the core interrupt handling code, for irq-chip |
| 8 | * based architectures. |
| 9 | * |
| 10 | * Detailed information is available in Documentation/DocBook/genericirq |
| 11 | */ |
| 12 | |
| 13 | #include <linux/irq.h> |
Michael Ellerman | 7fe3730 | 2007-04-18 19:39:21 +1000 | [diff] [blame] | 14 | #include <linux/msi.h> |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 15 | #include <linux/module.h> |
| 16 | #include <linux/interrupt.h> |
| 17 | #include <linux/kernel_stat.h> |
| 18 | |
| 19 | #include "internals.h" |
| 20 | |
| 21 | /** |
Eric W. Biederman | 3a16d71 | 2006-10-04 02:16:37 -0700 | [diff] [blame] | 22 | * dynamic_irq_init - initialize a dynamically allocated irq |
| 23 | * @irq: irq number to initialize |
| 24 | */ |
| 25 | void dynamic_irq_init(unsigned int irq) |
| 26 | { |
Yinghai Lu | 0b8f1ef | 2008-12-05 18:58:31 -0800 | [diff] [blame] | 27 | struct irq_desc *desc; |
Eric W. Biederman | 3a16d71 | 2006-10-04 02:16:37 -0700 | [diff] [blame] | 28 | unsigned long flags; |
| 29 | |
Yinghai Lu | 0b8f1ef | 2008-12-05 18:58:31 -0800 | [diff] [blame] | 30 | desc = irq_to_desc(irq); |
Yinghai Lu | 7d94f7c | 2008-08-19 20:50:14 -0700 | [diff] [blame] | 31 | if (!desc) { |
Arjan van de Ven | 261c40c | 2008-07-25 19:45:37 -0700 | [diff] [blame] | 32 | WARN(1, KERN_ERR "Trying to initialize invalid IRQ%d\n", irq); |
Eric W. Biederman | 3a16d71 | 2006-10-04 02:16:37 -0700 | [diff] [blame] | 33 | return; |
| 34 | } |
| 35 | |
| 36 | /* Ensure we don't have left over values from a previous use of this irq */ |
Eric W. Biederman | 3a16d71 | 2006-10-04 02:16:37 -0700 | [diff] [blame] | 37 | spin_lock_irqsave(&desc->lock, flags); |
| 38 | desc->status = IRQ_DISABLED; |
| 39 | desc->chip = &no_irq_chip; |
| 40 | desc->handle_irq = handle_bad_irq; |
| 41 | desc->depth = 1; |
Eric W. Biederman | 5b912c1 | 2007-01-28 12:52:03 -0700 | [diff] [blame] | 42 | desc->msi_desc = NULL; |
Eric W. Biederman | 3a16d71 | 2006-10-04 02:16:37 -0700 | [diff] [blame] | 43 | desc->handler_data = NULL; |
| 44 | desc->chip_data = NULL; |
| 45 | desc->action = NULL; |
| 46 | desc->irq_count = 0; |
| 47 | desc->irqs_unhandled = 0; |
| 48 | #ifdef CONFIG_SMP |
Mike Travis | 7f7ace0 | 2009-01-10 21:58:08 -0800 | [diff] [blame] | 49 | cpumask_setall(desc->affinity); |
| 50 | #ifdef CONFIG_GENERIC_PENDING_IRQ |
| 51 | cpumask_clear(desc->pending_mask); |
| 52 | #endif |
Eric W. Biederman | 3a16d71 | 2006-10-04 02:16:37 -0700 | [diff] [blame] | 53 | #endif |
| 54 | spin_unlock_irqrestore(&desc->lock, flags); |
| 55 | } |
| 56 | |
| 57 | /** |
| 58 | * dynamic_irq_cleanup - cleanup a dynamically allocated irq |
| 59 | * @irq: irq number to initialize |
| 60 | */ |
| 61 | void dynamic_irq_cleanup(unsigned int irq) |
| 62 | { |
Thomas Gleixner | d3c6004 | 2008-10-16 09:55:00 +0200 | [diff] [blame] | 63 | struct irq_desc *desc = irq_to_desc(irq); |
Eric W. Biederman | 3a16d71 | 2006-10-04 02:16:37 -0700 | [diff] [blame] | 64 | unsigned long flags; |
| 65 | |
Yinghai Lu | 7d94f7c | 2008-08-19 20:50:14 -0700 | [diff] [blame] | 66 | if (!desc) { |
Arjan van de Ven | 261c40c | 2008-07-25 19:45:37 -0700 | [diff] [blame] | 67 | WARN(1, KERN_ERR "Trying to cleanup invalid IRQ%d\n", irq); |
Eric W. Biederman | 3a16d71 | 2006-10-04 02:16:37 -0700 | [diff] [blame] | 68 | return; |
| 69 | } |
| 70 | |
Eric W. Biederman | 3a16d71 | 2006-10-04 02:16:37 -0700 | [diff] [blame] | 71 | spin_lock_irqsave(&desc->lock, flags); |
Eric W. Biederman | 1f80025 | 2006-10-04 02:16:56 -0700 | [diff] [blame] | 72 | if (desc->action) { |
| 73 | spin_unlock_irqrestore(&desc->lock, flags); |
Arjan van de Ven | 261c40c | 2008-07-25 19:45:37 -0700 | [diff] [blame] | 74 | WARN(1, KERN_ERR "Destroying IRQ%d without calling free_irq\n", |
Eric W. Biederman | 1f80025 | 2006-10-04 02:16:56 -0700 | [diff] [blame] | 75 | irq); |
Eric W. Biederman | 1f80025 | 2006-10-04 02:16:56 -0700 | [diff] [blame] | 76 | return; |
| 77 | } |
Eric W. Biederman | 5b912c1 | 2007-01-28 12:52:03 -0700 | [diff] [blame] | 78 | desc->msi_desc = NULL; |
| 79 | desc->handler_data = NULL; |
| 80 | desc->chip_data = NULL; |
Eric W. Biederman | 3a16d71 | 2006-10-04 02:16:37 -0700 | [diff] [blame] | 81 | desc->handle_irq = handle_bad_irq; |
| 82 | desc->chip = &no_irq_chip; |
Dean Nelson | b6f3b78 | 2008-10-18 16:06:56 -0700 | [diff] [blame] | 83 | desc->name = NULL; |
Eric W. Biederman | 3a16d71 | 2006-10-04 02:16:37 -0700 | [diff] [blame] | 84 | spin_unlock_irqrestore(&desc->lock, flags); |
| 85 | } |
| 86 | |
| 87 | |
| 88 | /** |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 89 | * set_irq_chip - set the irq chip for an irq |
| 90 | * @irq: irq number |
| 91 | * @chip: pointer to irq chip description structure |
| 92 | */ |
| 93 | int set_irq_chip(unsigned int irq, struct irq_chip *chip) |
| 94 | { |
Thomas Gleixner | d3c6004 | 2008-10-16 09:55:00 +0200 | [diff] [blame] | 95 | struct irq_desc *desc = irq_to_desc(irq); |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 96 | unsigned long flags; |
| 97 | |
Yinghai Lu | 7d94f7c | 2008-08-19 20:50:14 -0700 | [diff] [blame] | 98 | if (!desc) { |
Arjan van de Ven | 261c40c | 2008-07-25 19:45:37 -0700 | [diff] [blame] | 99 | WARN(1, KERN_ERR "Trying to install chip for IRQ%d\n", irq); |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 100 | return -EINVAL; |
| 101 | } |
| 102 | |
| 103 | if (!chip) |
| 104 | chip = &no_irq_chip; |
| 105 | |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 106 | spin_lock_irqsave(&desc->lock, flags); |
| 107 | irq_chip_set_defaults(chip); |
| 108 | desc->chip = chip; |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 109 | spin_unlock_irqrestore(&desc->lock, flags); |
| 110 | |
| 111 | return 0; |
| 112 | } |
| 113 | EXPORT_SYMBOL(set_irq_chip); |
| 114 | |
| 115 | /** |
David Brownell | 0c5d1eb | 2008-10-01 14:46:18 -0700 | [diff] [blame] | 116 | * set_irq_type - set the irq trigger type for an irq |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 117 | * @irq: irq number |
David Brownell | 0c5d1eb | 2008-10-01 14:46:18 -0700 | [diff] [blame] | 118 | * @type: IRQ_TYPE_{LEVEL,EDGE}_* value - see include/linux/irq.h |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 119 | */ |
| 120 | int set_irq_type(unsigned int irq, unsigned int type) |
| 121 | { |
Thomas Gleixner | d3c6004 | 2008-10-16 09:55:00 +0200 | [diff] [blame] | 122 | struct irq_desc *desc = irq_to_desc(irq); |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 123 | unsigned long flags; |
| 124 | int ret = -ENXIO; |
| 125 | |
Yinghai Lu | 7d94f7c | 2008-08-19 20:50:14 -0700 | [diff] [blame] | 126 | if (!desc) { |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 127 | printk(KERN_ERR "Trying to set irq type for IRQ%d\n", irq); |
| 128 | return -ENODEV; |
| 129 | } |
| 130 | |
David Brownell | f2b662d | 2008-12-01 14:31:38 -0800 | [diff] [blame] | 131 | type &= IRQ_TYPE_SENSE_MASK; |
David Brownell | 0c5d1eb | 2008-10-01 14:46:18 -0700 | [diff] [blame] | 132 | if (type == IRQ_TYPE_NONE) |
| 133 | return 0; |
| 134 | |
| 135 | spin_lock_irqsave(&desc->lock, flags); |
Chris Friesen | 0b3682ba3 | 2008-10-20 12:41:58 -0600 | [diff] [blame] | 136 | ret = __irq_set_trigger(desc, irq, type); |
David Brownell | 0c5d1eb | 2008-10-01 14:46:18 -0700 | [diff] [blame] | 137 | spin_unlock_irqrestore(&desc->lock, flags); |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 138 | return ret; |
| 139 | } |
| 140 | EXPORT_SYMBOL(set_irq_type); |
| 141 | |
| 142 | /** |
| 143 | * set_irq_data - set irq type data for an irq |
| 144 | * @irq: Interrupt number |
| 145 | * @data: Pointer to interrupt specific data |
| 146 | * |
| 147 | * Set the hardware irq controller data for an irq |
| 148 | */ |
| 149 | int set_irq_data(unsigned int irq, void *data) |
| 150 | { |
Thomas Gleixner | d3c6004 | 2008-10-16 09:55:00 +0200 | [diff] [blame] | 151 | struct irq_desc *desc = irq_to_desc(irq); |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 152 | unsigned long flags; |
| 153 | |
Yinghai Lu | 7d94f7c | 2008-08-19 20:50:14 -0700 | [diff] [blame] | 154 | if (!desc) { |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 155 | printk(KERN_ERR |
| 156 | "Trying to install controller data for IRQ%d\n", irq); |
| 157 | return -EINVAL; |
| 158 | } |
| 159 | |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 160 | spin_lock_irqsave(&desc->lock, flags); |
| 161 | desc->handler_data = data; |
| 162 | spin_unlock_irqrestore(&desc->lock, flags); |
| 163 | return 0; |
| 164 | } |
| 165 | EXPORT_SYMBOL(set_irq_data); |
| 166 | |
| 167 | /** |
Eric W. Biederman | 5b912c1 | 2007-01-28 12:52:03 -0700 | [diff] [blame] | 168 | * set_irq_data - set irq type data for an irq |
| 169 | * @irq: Interrupt number |
Randy Dunlap | 472900b | 2007-02-16 01:28:25 -0800 | [diff] [blame] | 170 | * @entry: Pointer to MSI descriptor data |
Eric W. Biederman | 5b912c1 | 2007-01-28 12:52:03 -0700 | [diff] [blame] | 171 | * |
| 172 | * Set the hardware irq controller data for an irq |
| 173 | */ |
| 174 | int set_irq_msi(unsigned int irq, struct msi_desc *entry) |
| 175 | { |
Thomas Gleixner | d3c6004 | 2008-10-16 09:55:00 +0200 | [diff] [blame] | 176 | struct irq_desc *desc = irq_to_desc(irq); |
Eric W. Biederman | 5b912c1 | 2007-01-28 12:52:03 -0700 | [diff] [blame] | 177 | unsigned long flags; |
| 178 | |
Yinghai Lu | 7d94f7c | 2008-08-19 20:50:14 -0700 | [diff] [blame] | 179 | if (!desc) { |
Eric W. Biederman | 5b912c1 | 2007-01-28 12:52:03 -0700 | [diff] [blame] | 180 | printk(KERN_ERR |
| 181 | "Trying to install msi data for IRQ%d\n", irq); |
| 182 | return -EINVAL; |
| 183 | } |
Yinghai Lu | 7d94f7c | 2008-08-19 20:50:14 -0700 | [diff] [blame] | 184 | |
Eric W. Biederman | 5b912c1 | 2007-01-28 12:52:03 -0700 | [diff] [blame] | 185 | spin_lock_irqsave(&desc->lock, flags); |
| 186 | desc->msi_desc = entry; |
Michael Ellerman | 7fe3730 | 2007-04-18 19:39:21 +1000 | [diff] [blame] | 187 | if (entry) |
| 188 | entry->irq = irq; |
Eric W. Biederman | 5b912c1 | 2007-01-28 12:52:03 -0700 | [diff] [blame] | 189 | spin_unlock_irqrestore(&desc->lock, flags); |
| 190 | return 0; |
| 191 | } |
| 192 | |
| 193 | /** |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 194 | * set_irq_chip_data - set irq chip data for an irq |
| 195 | * @irq: Interrupt number |
| 196 | * @data: Pointer to chip specific data |
| 197 | * |
| 198 | * Set the hardware irq chip data for an irq |
| 199 | */ |
| 200 | int set_irq_chip_data(unsigned int irq, void *data) |
| 201 | { |
Thomas Gleixner | d3c6004 | 2008-10-16 09:55:00 +0200 | [diff] [blame] | 202 | struct irq_desc *desc = irq_to_desc(irq); |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 203 | unsigned long flags; |
| 204 | |
Yinghai Lu | 7d94f7c | 2008-08-19 20:50:14 -0700 | [diff] [blame] | 205 | if (!desc) { |
| 206 | printk(KERN_ERR |
| 207 | "Trying to install chip data for IRQ%d\n", irq); |
| 208 | return -EINVAL; |
| 209 | } |
| 210 | |
| 211 | if (!desc->chip) { |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 212 | printk(KERN_ERR "BUG: bad set_irq_chip_data(IRQ#%d)\n", irq); |
| 213 | return -EINVAL; |
| 214 | } |
| 215 | |
| 216 | spin_lock_irqsave(&desc->lock, flags); |
| 217 | desc->chip_data = data; |
| 218 | spin_unlock_irqrestore(&desc->lock, flags); |
| 219 | |
| 220 | return 0; |
| 221 | } |
| 222 | EXPORT_SYMBOL(set_irq_chip_data); |
| 223 | |
| 224 | /* |
| 225 | * default enable function |
| 226 | */ |
| 227 | static void default_enable(unsigned int irq) |
| 228 | { |
Thomas Gleixner | d3c6004 | 2008-10-16 09:55:00 +0200 | [diff] [blame] | 229 | struct irq_desc *desc = irq_to_desc(irq); |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 230 | |
| 231 | desc->chip->unmask(irq); |
| 232 | desc->status &= ~IRQ_MASKED; |
| 233 | } |
| 234 | |
| 235 | /* |
| 236 | * default disable function |
| 237 | */ |
| 238 | static void default_disable(unsigned int irq) |
| 239 | { |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 240 | } |
| 241 | |
| 242 | /* |
| 243 | * default startup function |
| 244 | */ |
| 245 | static unsigned int default_startup(unsigned int irq) |
| 246 | { |
Thomas Gleixner | d3c6004 | 2008-10-16 09:55:00 +0200 | [diff] [blame] | 247 | struct irq_desc *desc = irq_to_desc(irq); |
Yinghai Lu | 08678b0 | 2008-08-19 20:50:05 -0700 | [diff] [blame] | 248 | |
Yinghai Lu | 08678b0 | 2008-08-19 20:50:05 -0700 | [diff] [blame] | 249 | desc->chip->enable(irq); |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 250 | return 0; |
| 251 | } |
| 252 | |
| 253 | /* |
Thomas Gleixner | 89d694b | 2008-02-18 18:25:17 +0100 | [diff] [blame] | 254 | * default shutdown function |
| 255 | */ |
| 256 | static void default_shutdown(unsigned int irq) |
| 257 | { |
Thomas Gleixner | d3c6004 | 2008-10-16 09:55:00 +0200 | [diff] [blame] | 258 | struct irq_desc *desc = irq_to_desc(irq); |
Thomas Gleixner | 89d694b | 2008-02-18 18:25:17 +0100 | [diff] [blame] | 259 | |
| 260 | desc->chip->mask(irq); |
| 261 | desc->status |= IRQ_MASKED; |
| 262 | } |
| 263 | |
| 264 | /* |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 265 | * Fixup enable/disable function pointers |
| 266 | */ |
| 267 | void irq_chip_set_defaults(struct irq_chip *chip) |
| 268 | { |
| 269 | if (!chip->enable) |
| 270 | chip->enable = default_enable; |
| 271 | if (!chip->disable) |
| 272 | chip->disable = default_disable; |
| 273 | if (!chip->startup) |
| 274 | chip->startup = default_startup; |
Thomas Gleixner | 89d694b | 2008-02-18 18:25:17 +0100 | [diff] [blame] | 275 | /* |
| 276 | * We use chip->disable, when the user provided its own. When |
| 277 | * we have default_disable set for chip->disable, then we need |
| 278 | * to use default_shutdown, otherwise the irq line is not |
| 279 | * disabled on free_irq(): |
| 280 | */ |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 281 | if (!chip->shutdown) |
Thomas Gleixner | 89d694b | 2008-02-18 18:25:17 +0100 | [diff] [blame] | 282 | chip->shutdown = chip->disable != default_disable ? |
| 283 | chip->disable : default_shutdown; |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 284 | if (!chip->name) |
| 285 | chip->name = chip->typename; |
Zhang, Yanmin | b86432b | 2006-11-16 01:19:10 -0800 | [diff] [blame] | 286 | if (!chip->end) |
| 287 | chip->end = dummy_irq_chip.end; |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 288 | } |
| 289 | |
| 290 | static inline void mask_ack_irq(struct irq_desc *desc, int irq) |
| 291 | { |
| 292 | if (desc->chip->mask_ack) |
| 293 | desc->chip->mask_ack(irq); |
| 294 | else { |
| 295 | desc->chip->mask(irq); |
| 296 | desc->chip->ack(irq); |
| 297 | } |
| 298 | } |
| 299 | |
| 300 | /** |
| 301 | * handle_simple_irq - Simple and software-decoded IRQs. |
| 302 | * @irq: the interrupt number |
| 303 | * @desc: the interrupt description structure for this irq |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 304 | * |
| 305 | * Simple interrupts are either sent from a demultiplexing interrupt |
| 306 | * handler or come from hardware, where no interrupt hardware control |
| 307 | * is necessary. |
| 308 | * |
| 309 | * Note: The caller is expected to handle the ack, clear, mask and |
| 310 | * unmask issues if necessary. |
| 311 | */ |
Harvey Harrison | 7ad5b3a | 2008-02-08 04:19:53 -0800 | [diff] [blame] | 312 | void |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 313 | handle_simple_irq(unsigned int irq, struct irq_desc *desc) |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 314 | { |
| 315 | struct irqaction *action; |
| 316 | irqreturn_t action_ret; |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 317 | |
| 318 | spin_lock(&desc->lock); |
| 319 | |
| 320 | if (unlikely(desc->status & IRQ_INPROGRESS)) |
| 321 | goto out_unlock; |
Steven Rostedt | 971e5b35f | 2007-12-18 18:05:58 +0100 | [diff] [blame] | 322 | desc->status &= ~(IRQ_REPLAY | IRQ_WAITING); |
Thomas Gleixner | d6c88a5 | 2008-10-15 15:27:23 +0200 | [diff] [blame] | 323 | kstat_incr_irqs_this_cpu(irq, desc); |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 324 | |
| 325 | action = desc->action; |
Steven Rostedt | 971e5b35f | 2007-12-18 18:05:58 +0100 | [diff] [blame] | 326 | if (unlikely(!action || (desc->status & IRQ_DISABLED))) |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 327 | goto out_unlock; |
| 328 | |
| 329 | desc->status |= IRQ_INPROGRESS; |
| 330 | spin_unlock(&desc->lock); |
| 331 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 332 | action_ret = handle_IRQ_event(irq, action); |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 333 | if (!noirqdebug) |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 334 | note_interrupt(irq, desc, action_ret); |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 335 | |
| 336 | spin_lock(&desc->lock); |
| 337 | desc->status &= ~IRQ_INPROGRESS; |
| 338 | out_unlock: |
| 339 | spin_unlock(&desc->lock); |
| 340 | } |
| 341 | |
| 342 | /** |
| 343 | * handle_level_irq - Level type irq handler |
| 344 | * @irq: the interrupt number |
| 345 | * @desc: the interrupt description structure for this irq |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 346 | * |
| 347 | * Level type interrupts are active as long as the hardware line has |
| 348 | * the active level. This may require to mask the interrupt and unmask |
| 349 | * it after the associated handler has acknowledged the device, so the |
| 350 | * interrupt line is back to inactive. |
| 351 | */ |
Harvey Harrison | 7ad5b3a | 2008-02-08 04:19:53 -0800 | [diff] [blame] | 352 | void |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 353 | handle_level_irq(unsigned int irq, struct irq_desc *desc) |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 354 | { |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 355 | struct irqaction *action; |
| 356 | irqreturn_t action_ret; |
| 357 | |
| 358 | spin_lock(&desc->lock); |
| 359 | mask_ack_irq(desc, irq); |
Yinghai Lu | 48a1b10 | 2008-12-11 00:15:01 -0800 | [diff] [blame] | 360 | desc = irq_remap_to_desc(irq, desc); |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 361 | |
| 362 | if (unlikely(desc->status & IRQ_INPROGRESS)) |
Ingo Molnar | 86998aa | 2006-09-19 11:14:34 +0200 | [diff] [blame] | 363 | goto out_unlock; |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 364 | desc->status &= ~(IRQ_REPLAY | IRQ_WAITING); |
Thomas Gleixner | d6c88a5 | 2008-10-15 15:27:23 +0200 | [diff] [blame] | 365 | kstat_incr_irqs_this_cpu(irq, desc); |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 366 | |
| 367 | /* |
| 368 | * If its disabled or no action available |
| 369 | * keep it masked and get out of here |
| 370 | */ |
| 371 | action = desc->action; |
Thomas Gleixner | 4966342 | 2007-08-12 15:46:34 +0000 | [diff] [blame] | 372 | if (unlikely(!action || (desc->status & IRQ_DISABLED))) |
Ingo Molnar | 86998aa | 2006-09-19 11:14:34 +0200 | [diff] [blame] | 373 | goto out_unlock; |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 374 | |
| 375 | desc->status |= IRQ_INPROGRESS; |
| 376 | spin_unlock(&desc->lock); |
| 377 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 378 | action_ret = handle_IRQ_event(irq, action); |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 379 | if (!noirqdebug) |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 380 | note_interrupt(irq, desc, action_ret); |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 381 | |
| 382 | spin_lock(&desc->lock); |
| 383 | desc->status &= ~IRQ_INPROGRESS; |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 384 | if (!(desc->status & IRQ_DISABLED) && desc->chip->unmask) |
| 385 | desc->chip->unmask(irq); |
Ingo Molnar | 86998aa | 2006-09-19 11:14:34 +0200 | [diff] [blame] | 386 | out_unlock: |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 387 | spin_unlock(&desc->lock); |
| 388 | } |
Ingo Molnar | 14819ea | 2009-01-14 12:34:21 +0100 | [diff] [blame] | 389 | EXPORT_SYMBOL_GPL(handle_level_irq); |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 390 | |
| 391 | /** |
Ingo Molnar | 47c2a3a | 2006-06-29 02:25:03 -0700 | [diff] [blame] | 392 | * handle_fasteoi_irq - irq handler for transparent controllers |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 393 | * @irq: the interrupt number |
| 394 | * @desc: the interrupt description structure for this irq |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 395 | * |
Ingo Molnar | 47c2a3a | 2006-06-29 02:25:03 -0700 | [diff] [blame] | 396 | * Only a single callback will be issued to the chip: an ->eoi() |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 397 | * call when the interrupt has been serviced. This enables support |
| 398 | * for modern forms of interrupt handlers, which handle the flow |
| 399 | * details in hardware, transparently. |
| 400 | */ |
Harvey Harrison | 7ad5b3a | 2008-02-08 04:19:53 -0800 | [diff] [blame] | 401 | void |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 402 | handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc) |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 403 | { |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 404 | struct irqaction *action; |
| 405 | irqreturn_t action_ret; |
| 406 | |
| 407 | spin_lock(&desc->lock); |
| 408 | |
| 409 | if (unlikely(desc->status & IRQ_INPROGRESS)) |
| 410 | goto out; |
| 411 | |
| 412 | desc->status &= ~(IRQ_REPLAY | IRQ_WAITING); |
Thomas Gleixner | d6c88a5 | 2008-10-15 15:27:23 +0200 | [diff] [blame] | 413 | kstat_incr_irqs_this_cpu(irq, desc); |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 414 | |
| 415 | /* |
| 416 | * If its disabled or no action available |
Ingo Molnar | 76d2160 | 2007-02-16 01:28:24 -0800 | [diff] [blame] | 417 | * then mask it and get out of here: |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 418 | */ |
| 419 | action = desc->action; |
Benjamin Herrenschmidt | 98bb244 | 2006-06-29 02:25:01 -0700 | [diff] [blame] | 420 | if (unlikely(!action || (desc->status & IRQ_DISABLED))) { |
| 421 | desc->status |= IRQ_PENDING; |
Ingo Molnar | 76d2160 | 2007-02-16 01:28:24 -0800 | [diff] [blame] | 422 | if (desc->chip->mask) |
| 423 | desc->chip->mask(irq); |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 424 | goto out; |
Benjamin Herrenschmidt | 98bb244 | 2006-06-29 02:25:01 -0700 | [diff] [blame] | 425 | } |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 426 | |
| 427 | desc->status |= IRQ_INPROGRESS; |
Benjamin Herrenschmidt | 98bb244 | 2006-06-29 02:25:01 -0700 | [diff] [blame] | 428 | desc->status &= ~IRQ_PENDING; |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 429 | spin_unlock(&desc->lock); |
| 430 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 431 | action_ret = handle_IRQ_event(irq, action); |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 432 | if (!noirqdebug) |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 433 | note_interrupt(irq, desc, action_ret); |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 434 | |
| 435 | spin_lock(&desc->lock); |
| 436 | desc->status &= ~IRQ_INPROGRESS; |
| 437 | out: |
Ingo Molnar | 47c2a3a | 2006-06-29 02:25:03 -0700 | [diff] [blame] | 438 | desc->chip->eoi(irq); |
Yinghai Lu | 48a1b10 | 2008-12-11 00:15:01 -0800 | [diff] [blame] | 439 | desc = irq_remap_to_desc(irq, desc); |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 440 | |
| 441 | spin_unlock(&desc->lock); |
| 442 | } |
| 443 | |
| 444 | /** |
| 445 | * handle_edge_irq - edge type IRQ handler |
| 446 | * @irq: the interrupt number |
| 447 | * @desc: the interrupt description structure for this irq |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 448 | * |
| 449 | * Interrupt occures on the falling and/or rising edge of a hardware |
| 450 | * signal. The occurence is latched into the irq controller hardware |
| 451 | * and must be acked in order to be reenabled. After the ack another |
| 452 | * interrupt can happen on the same source even before the first one |
| 453 | * is handled by the assosiacted event handler. If this happens it |
| 454 | * might be necessary to disable (mask) the interrupt depending on the |
| 455 | * controller hardware. This requires to reenable the interrupt inside |
| 456 | * of the loop which handles the interrupts which have arrived while |
| 457 | * the handler was running. If all pending interrupts are handled, the |
| 458 | * loop is left. |
| 459 | */ |
Harvey Harrison | 7ad5b3a | 2008-02-08 04:19:53 -0800 | [diff] [blame] | 460 | void |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 461 | handle_edge_irq(unsigned int irq, struct irq_desc *desc) |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 462 | { |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 463 | spin_lock(&desc->lock); |
| 464 | |
| 465 | desc->status &= ~(IRQ_REPLAY | IRQ_WAITING); |
| 466 | |
| 467 | /* |
| 468 | * If we're currently running this IRQ, or its disabled, |
| 469 | * we shouldn't process the IRQ. Mark it pending, handle |
| 470 | * the necessary masking and go out |
| 471 | */ |
| 472 | if (unlikely((desc->status & (IRQ_INPROGRESS | IRQ_DISABLED)) || |
| 473 | !desc->action)) { |
| 474 | desc->status |= (IRQ_PENDING | IRQ_MASKED); |
| 475 | mask_ack_irq(desc, irq); |
Yinghai Lu | 48a1b10 | 2008-12-11 00:15:01 -0800 | [diff] [blame] | 476 | desc = irq_remap_to_desc(irq, desc); |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 477 | goto out_unlock; |
| 478 | } |
Thomas Gleixner | d6c88a5 | 2008-10-15 15:27:23 +0200 | [diff] [blame] | 479 | kstat_incr_irqs_this_cpu(irq, desc); |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 480 | |
| 481 | /* Start handling the irq */ |
| 482 | desc->chip->ack(irq); |
Yinghai Lu | 48a1b10 | 2008-12-11 00:15:01 -0800 | [diff] [blame] | 483 | desc = irq_remap_to_desc(irq, desc); |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 484 | |
| 485 | /* Mark the IRQ currently in progress.*/ |
| 486 | desc->status |= IRQ_INPROGRESS; |
| 487 | |
| 488 | do { |
| 489 | struct irqaction *action = desc->action; |
| 490 | irqreturn_t action_ret; |
| 491 | |
| 492 | if (unlikely(!action)) { |
| 493 | desc->chip->mask(irq); |
| 494 | goto out_unlock; |
| 495 | } |
| 496 | |
| 497 | /* |
| 498 | * When another irq arrived while we were handling |
| 499 | * one, we could have masked the irq. |
| 500 | * Renable it, if it was not disabled in meantime. |
| 501 | */ |
| 502 | if (unlikely((desc->status & |
| 503 | (IRQ_PENDING | IRQ_MASKED | IRQ_DISABLED)) == |
| 504 | (IRQ_PENDING | IRQ_MASKED))) { |
| 505 | desc->chip->unmask(irq); |
| 506 | desc->status &= ~IRQ_MASKED; |
| 507 | } |
| 508 | |
| 509 | desc->status &= ~IRQ_PENDING; |
| 510 | spin_unlock(&desc->lock); |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 511 | action_ret = handle_IRQ_event(irq, action); |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 512 | if (!noirqdebug) |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 513 | note_interrupt(irq, desc, action_ret); |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 514 | spin_lock(&desc->lock); |
| 515 | |
| 516 | } while ((desc->status & (IRQ_PENDING | IRQ_DISABLED)) == IRQ_PENDING); |
| 517 | |
| 518 | desc->status &= ~IRQ_INPROGRESS; |
| 519 | out_unlock: |
| 520 | spin_unlock(&desc->lock); |
| 521 | } |
| 522 | |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 523 | /** |
| 524 | * handle_percpu_IRQ - Per CPU local irq handler |
| 525 | * @irq: the interrupt number |
| 526 | * @desc: the interrupt description structure for this irq |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 527 | * |
| 528 | * Per CPU interrupts on SMP machines without locking requirements |
| 529 | */ |
Harvey Harrison | 7ad5b3a | 2008-02-08 04:19:53 -0800 | [diff] [blame] | 530 | void |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 531 | handle_percpu_irq(unsigned int irq, struct irq_desc *desc) |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 532 | { |
| 533 | irqreturn_t action_ret; |
| 534 | |
Thomas Gleixner | d6c88a5 | 2008-10-15 15:27:23 +0200 | [diff] [blame] | 535 | kstat_incr_irqs_this_cpu(irq, desc); |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 536 | |
| 537 | if (desc->chip->ack) |
| 538 | desc->chip->ack(irq); |
| 539 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 540 | action_ret = handle_IRQ_event(irq, desc->action); |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 541 | if (!noirqdebug) |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 542 | note_interrupt(irq, desc, action_ret); |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 543 | |
Yinghai Lu | 48a1b10 | 2008-12-11 00:15:01 -0800 | [diff] [blame] | 544 | if (desc->chip->eoi) { |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 545 | desc->chip->eoi(irq); |
Yinghai Lu | 48a1b10 | 2008-12-11 00:15:01 -0800 | [diff] [blame] | 546 | desc = irq_remap_to_desc(irq, desc); |
| 547 | } |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 548 | } |
| 549 | |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 550 | void |
Ingo Molnar | a460e74 | 2006-10-17 00:10:03 -0700 | [diff] [blame] | 551 | __set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained, |
| 552 | const char *name) |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 553 | { |
Thomas Gleixner | d3c6004 | 2008-10-16 09:55:00 +0200 | [diff] [blame] | 554 | struct irq_desc *desc = irq_to_desc(irq); |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 555 | unsigned long flags; |
| 556 | |
Yinghai Lu | 7d94f7c | 2008-08-19 20:50:14 -0700 | [diff] [blame] | 557 | if (!desc) { |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 558 | printk(KERN_ERR |
| 559 | "Trying to install type control for IRQ%d\n", irq); |
| 560 | return; |
| 561 | } |
| 562 | |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 563 | if (!handle) |
| 564 | handle = handle_bad_irq; |
Thomas Gleixner | 9d7ac8b | 2006-12-22 01:08:14 -0800 | [diff] [blame] | 565 | else if (desc->chip == &no_irq_chip) { |
Thomas Gleixner | f8b5473 | 2006-07-01 22:30:08 +0100 | [diff] [blame] | 566 | printk(KERN_WARNING "Trying to install %sinterrupt handler " |
Geert Uytterhoeven | b039db8 | 2006-12-20 15:59:48 +0100 | [diff] [blame] | 567 | "for IRQ%d\n", is_chained ? "chained " : "", irq); |
Thomas Gleixner | f8b5473 | 2006-07-01 22:30:08 +0100 | [diff] [blame] | 568 | /* |
| 569 | * Some ARM implementations install a handler for really dumb |
| 570 | * interrupt hardware without setting an irq_chip. This worked |
| 571 | * with the ARM no_irq_chip but the check in setup_irq would |
| 572 | * prevent us to setup the interrupt at all. Switch it to |
| 573 | * dummy_irq_chip for easy transition. |
| 574 | */ |
| 575 | desc->chip = &dummy_irq_chip; |
| 576 | } |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 577 | |
| 578 | spin_lock_irqsave(&desc->lock, flags); |
| 579 | |
| 580 | /* Uninstall? */ |
| 581 | if (handle == handle_bad_irq) { |
Yinghai Lu | 48a1b10 | 2008-12-11 00:15:01 -0800 | [diff] [blame] | 582 | if (desc->chip != &no_irq_chip) { |
Jan Beulich | 5575ddf | 2007-02-16 01:28:26 -0800 | [diff] [blame] | 583 | mask_ack_irq(desc, irq); |
Yinghai Lu | 48a1b10 | 2008-12-11 00:15:01 -0800 | [diff] [blame] | 584 | desc = irq_remap_to_desc(irq, desc); |
| 585 | } |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 586 | desc->status |= IRQ_DISABLED; |
| 587 | desc->depth = 1; |
| 588 | } |
| 589 | desc->handle_irq = handle; |
Ingo Molnar | a460e74 | 2006-10-17 00:10:03 -0700 | [diff] [blame] | 590 | desc->name = name; |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 591 | |
| 592 | if (handle != handle_bad_irq && is_chained) { |
| 593 | desc->status &= ~IRQ_DISABLED; |
| 594 | desc->status |= IRQ_NOREQUEST | IRQ_NOPROBE; |
| 595 | desc->depth = 0; |
Pawel MOLL | 7e6e178 | 2008-09-01 10:12:11 +0100 | [diff] [blame] | 596 | desc->chip->startup(irq); |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 597 | } |
| 598 | spin_unlock_irqrestore(&desc->lock, flags); |
| 599 | } |
Ingo Molnar | 14819ea | 2009-01-14 12:34:21 +0100 | [diff] [blame] | 600 | EXPORT_SYMBOL_GPL(__set_irq_handler); |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 601 | |
| 602 | void |
| 603 | set_irq_chip_and_handler(unsigned int irq, struct irq_chip *chip, |
David Howells | 57a58a9 | 2006-10-05 13:06:34 +0100 | [diff] [blame] | 604 | irq_flow_handler_t handle) |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 605 | { |
| 606 | set_irq_chip(irq, chip); |
Ingo Molnar | a460e74 | 2006-10-17 00:10:03 -0700 | [diff] [blame] | 607 | __set_irq_handler(irq, handle, 0, NULL); |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 608 | } |
| 609 | |
Ingo Molnar | a460e74 | 2006-10-17 00:10:03 -0700 | [diff] [blame] | 610 | void |
| 611 | set_irq_chip_and_handler_name(unsigned int irq, struct irq_chip *chip, |
| 612 | irq_flow_handler_t handle, const char *name) |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 613 | { |
Ingo Molnar | a460e74 | 2006-10-17 00:10:03 -0700 | [diff] [blame] | 614 | set_irq_chip(irq, chip); |
| 615 | __set_irq_handler(irq, handle, 0, name); |
Thomas Gleixner | dd87eb3 | 2006-06-29 02:24:53 -0700 | [diff] [blame] | 616 | } |
Ralf Baechle | 46f4f8f | 2008-02-08 04:22:01 -0800 | [diff] [blame] | 617 | |
| 618 | void __init set_irq_noprobe(unsigned int irq) |
| 619 | { |
Thomas Gleixner | d3c6004 | 2008-10-16 09:55:00 +0200 | [diff] [blame] | 620 | struct irq_desc *desc = irq_to_desc(irq); |
Ralf Baechle | 46f4f8f | 2008-02-08 04:22:01 -0800 | [diff] [blame] | 621 | unsigned long flags; |
| 622 | |
Yinghai Lu | 7d94f7c | 2008-08-19 20:50:14 -0700 | [diff] [blame] | 623 | if (!desc) { |
Ralf Baechle | 46f4f8f | 2008-02-08 04:22:01 -0800 | [diff] [blame] | 624 | printk(KERN_ERR "Trying to mark IRQ%d non-probeable\n", irq); |
Ralf Baechle | 46f4f8f | 2008-02-08 04:22:01 -0800 | [diff] [blame] | 625 | return; |
| 626 | } |
| 627 | |
Ralf Baechle | 46f4f8f | 2008-02-08 04:22:01 -0800 | [diff] [blame] | 628 | spin_lock_irqsave(&desc->lock, flags); |
| 629 | desc->status |= IRQ_NOPROBE; |
| 630 | spin_unlock_irqrestore(&desc->lock, flags); |
| 631 | } |
| 632 | |
| 633 | void __init set_irq_probe(unsigned int irq) |
| 634 | { |
Thomas Gleixner | d3c6004 | 2008-10-16 09:55:00 +0200 | [diff] [blame] | 635 | struct irq_desc *desc = irq_to_desc(irq); |
Ralf Baechle | 46f4f8f | 2008-02-08 04:22:01 -0800 | [diff] [blame] | 636 | unsigned long flags; |
| 637 | |
Yinghai Lu | 7d94f7c | 2008-08-19 20:50:14 -0700 | [diff] [blame] | 638 | if (!desc) { |
Ralf Baechle | 46f4f8f | 2008-02-08 04:22:01 -0800 | [diff] [blame] | 639 | printk(KERN_ERR "Trying to mark IRQ%d probeable\n", irq); |
Ralf Baechle | 46f4f8f | 2008-02-08 04:22:01 -0800 | [diff] [blame] | 640 | return; |
| 641 | } |
| 642 | |
Ralf Baechle | 46f4f8f | 2008-02-08 04:22:01 -0800 | [diff] [blame] | 643 | spin_lock_irqsave(&desc->lock, flags); |
| 644 | desc->status &= ~IRQ_NOPROBE; |
| 645 | spin_unlock_irqrestore(&desc->lock, flags); |
| 646 | } |