Nicolas Pitre | d1496c3 | 2007-06-30 16:29:41 +0200 | [diff] [blame] | 1 | /* |
| 2 | * linux/drivers/mmc/core/sdio_irq.c |
| 3 | * |
| 4 | * Author: Nicolas Pitre |
| 5 | * Created: June 18, 2007 |
| 6 | * Copyright: MontaVista Software Inc. |
| 7 | * |
Pierre Ossman | e633b7b | 2008-08-31 13:38:54 +0200 | [diff] [blame] | 8 | * Copyright 2008 Pierre Ossman |
| 9 | * |
Nicolas Pitre | d1496c3 | 2007-06-30 16:29:41 +0200 | [diff] [blame] | 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License as published by |
| 12 | * the Free Software Foundation; either version 2 of the License, or (at |
| 13 | * your option) any later version. |
| 14 | */ |
| 15 | |
| 16 | #include <linux/kernel.h> |
| 17 | #include <linux/sched.h> |
| 18 | #include <linux/kthread.h> |
Paul Gortmaker | 3ef77af | 2011-07-10 12:42:00 -0400 | [diff] [blame] | 19 | #include <linux/export.h> |
Nicolas Pitre | d1496c3 | 2007-06-30 16:29:41 +0200 | [diff] [blame] | 20 | #include <linux/wait.h> |
| 21 | #include <linux/delay.h> |
| 22 | |
| 23 | #include <linux/mmc/core.h> |
| 24 | #include <linux/mmc/host.h> |
| 25 | #include <linux/mmc/card.h> |
| 26 | #include <linux/mmc/sdio.h> |
| 27 | #include <linux/mmc/sdio_func.h> |
| 28 | |
| 29 | #include "sdio_ops.h" |
| 30 | |
Nicolas Pitre | fed14d9 | 2012-04-16 19:16:54 -0400 | [diff] [blame] | 31 | static int process_sdio_pending_irqs(struct mmc_host *host) |
Nicolas Pitre | d1496c3 | 2007-06-30 16:29:41 +0200 | [diff] [blame] | 32 | { |
Nicolas Pitre | fed14d9 | 2012-04-16 19:16:54 -0400 | [diff] [blame] | 33 | struct mmc_card *card = host->card; |
Pierre Ossman | 6f4285d | 2007-09-27 10:48:29 +0200 | [diff] [blame] | 34 | int i, ret, count; |
Nicolas Pitre | d1496c3 | 2007-06-30 16:29:41 +0200 | [diff] [blame] | 35 | unsigned char pending; |
Stefan Nilsson XK | 06e8935 | 2011-05-11 17:48:05 +0200 | [diff] [blame] | 36 | struct sdio_func *func; |
| 37 | |
| 38 | /* |
| 39 | * Optimization, if there is only 1 function interrupt registered |
Nicolas Pitre | fed14d9 | 2012-04-16 19:16:54 -0400 | [diff] [blame] | 40 | * and we know an IRQ was signaled then call irq handler directly. |
| 41 | * Otherwise do the full probe. |
Stefan Nilsson XK | 06e8935 | 2011-05-11 17:48:05 +0200 | [diff] [blame] | 42 | */ |
| 43 | func = card->sdio_single_irq; |
Nicolas Pitre | fed14d9 | 2012-04-16 19:16:54 -0400 | [diff] [blame] | 44 | if (func && host->sdio_irq_pending) { |
Stefan Nilsson XK | 06e8935 | 2011-05-11 17:48:05 +0200 | [diff] [blame] | 45 | func->irq_handler(func); |
| 46 | return 1; |
| 47 | } |
Nicolas Pitre | d1496c3 | 2007-06-30 16:29:41 +0200 | [diff] [blame] | 48 | |
| 49 | ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_INTx, 0, &pending); |
| 50 | if (ret) { |
Girish K S | a3c76eb | 2011-10-11 11:44:09 +0530 | [diff] [blame] | 51 | pr_debug("%s: error %d reading SDIO_CCCR_INTx\n", |
Nicolas Pitre | d1496c3 | 2007-06-30 16:29:41 +0200 | [diff] [blame] | 52 | mmc_card_id(card), ret); |
| 53 | return ret; |
| 54 | } |
| 55 | |
Pierre Ossman | 6f4285d | 2007-09-27 10:48:29 +0200 | [diff] [blame] | 56 | count = 0; |
Nicolas Pitre | d1496c3 | 2007-06-30 16:29:41 +0200 | [diff] [blame] | 57 | for (i = 1; i <= 7; i++) { |
| 58 | if (pending & (1 << i)) { |
Stefan Nilsson XK | 06e8935 | 2011-05-11 17:48:05 +0200 | [diff] [blame] | 59 | func = card->sdio_func[i - 1]; |
Nicolas Pitre | d1496c3 | 2007-06-30 16:29:41 +0200 | [diff] [blame] | 60 | if (!func) { |
Girish K S | a3c76eb | 2011-10-11 11:44:09 +0530 | [diff] [blame] | 61 | pr_warning("%s: pending IRQ for " |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 62 | "non-existent function\n", |
Nicolas Pitre | 3e01e4b | 2007-10-03 15:32:10 -0400 | [diff] [blame] | 63 | mmc_card_id(card)); |
Nicolas Pitre | 599473c | 2007-10-03 15:32:57 -0400 | [diff] [blame] | 64 | ret = -EINVAL; |
Nicolas Pitre | d1496c3 | 2007-06-30 16:29:41 +0200 | [diff] [blame] | 65 | } else if (func->irq_handler) { |
| 66 | func->irq_handler(func); |
Pierre Ossman | 6f4285d | 2007-09-27 10:48:29 +0200 | [diff] [blame] | 67 | count++; |
Nicolas Pitre | 599473c | 2007-10-03 15:32:57 -0400 | [diff] [blame] | 68 | } else { |
Girish K S | a3c76eb | 2011-10-11 11:44:09 +0530 | [diff] [blame] | 69 | pr_warning("%s: pending IRQ with no handler\n", |
Nicolas Pitre | d1496c3 | 2007-06-30 16:29:41 +0200 | [diff] [blame] | 70 | sdio_func_id(func)); |
Nicolas Pitre | 599473c | 2007-10-03 15:32:57 -0400 | [diff] [blame] | 71 | ret = -EINVAL; |
| 72 | } |
Nicolas Pitre | d1496c3 | 2007-06-30 16:29:41 +0200 | [diff] [blame] | 73 | } |
| 74 | } |
| 75 | |
Nicolas Pitre | 599473c | 2007-10-03 15:32:57 -0400 | [diff] [blame] | 76 | if (count) |
| 77 | return count; |
| 78 | |
| 79 | return ret; |
Nicolas Pitre | d1496c3 | 2007-06-30 16:29:41 +0200 | [diff] [blame] | 80 | } |
| 81 | |
| 82 | static int sdio_irq_thread(void *_host) |
| 83 | { |
| 84 | struct mmc_host *host = _host; |
| 85 | struct sched_param param = { .sched_priority = 1 }; |
Pierre Ossman | 6f4285d | 2007-09-27 10:48:29 +0200 | [diff] [blame] | 86 | unsigned long period, idle_period; |
Nicolas Pitre | d1496c3 | 2007-06-30 16:29:41 +0200 | [diff] [blame] | 87 | int ret; |
| 88 | |
| 89 | sched_setscheduler(current, SCHED_FIFO, ¶m); |
| 90 | |
| 91 | /* |
| 92 | * We want to allow for SDIO cards to work even on non SDIO |
| 93 | * aware hosts. One thing that non SDIO host cannot do is |
| 94 | * asynchronous notification of pending SDIO card interrupts |
| 95 | * hence we poll for them in that case. |
| 96 | */ |
Pierre Ossman | 6f4285d | 2007-09-27 10:48:29 +0200 | [diff] [blame] | 97 | idle_period = msecs_to_jiffies(10); |
Nicolas Pitre | 17b759a | 2007-07-24 02:09:39 -0400 | [diff] [blame] | 98 | period = (host->caps & MMC_CAP_SDIO_IRQ) ? |
Pierre Ossman | 6f4285d | 2007-09-27 10:48:29 +0200 | [diff] [blame] | 99 | MAX_SCHEDULE_TIMEOUT : idle_period; |
Nicolas Pitre | d1496c3 | 2007-06-30 16:29:41 +0200 | [diff] [blame] | 100 | |
| 101 | pr_debug("%s: IRQ thread started (poll period = %lu jiffies)\n", |
| 102 | mmc_hostname(host), period); |
| 103 | |
| 104 | do { |
| 105 | /* |
| 106 | * We claim the host here on drivers behalf for a couple |
| 107 | * reasons: |
| 108 | * |
| 109 | * 1) it is already needed to retrieve the CCCR_INTx; |
| 110 | * 2) we want the driver(s) to clear the IRQ condition ASAP; |
| 111 | * 3) we need to control the abort condition locally. |
| 112 | * |
| 113 | * Just like traditional hard IRQ handlers, we expect SDIO |
| 114 | * IRQ handlers to be quick and to the point, so that the |
| 115 | * holding of the host lock does not cover too much work |
| 116 | * that doesn't require that lock to be held. |
| 117 | */ |
| 118 | ret = __mmc_claim_host(host, &host->sdio_irq_thread_abort); |
| 119 | if (ret) |
| 120 | break; |
Nicolas Pitre | fed14d9 | 2012-04-16 19:16:54 -0400 | [diff] [blame] | 121 | ret = process_sdio_pending_irqs(host); |
| 122 | host->sdio_irq_pending = false; |
Nicolas Pitre | d1496c3 | 2007-06-30 16:29:41 +0200 | [diff] [blame] | 123 | mmc_release_host(host); |
| 124 | |
| 125 | /* |
| 126 | * Give other threads a chance to run in the presence of |
Pierre Ossman | e633b7b | 2008-08-31 13:38:54 +0200 | [diff] [blame] | 127 | * errors. |
Nicolas Pitre | d1496c3 | 2007-06-30 16:29:41 +0200 | [diff] [blame] | 128 | */ |
Pierre Ossman | e633b7b | 2008-08-31 13:38:54 +0200 | [diff] [blame] | 129 | if (ret < 0) { |
| 130 | set_current_state(TASK_INTERRUPTIBLE); |
| 131 | if (!kthread_should_stop()) |
| 132 | schedule_timeout(HZ); |
| 133 | set_current_state(TASK_RUNNING); |
| 134 | } |
Nicolas Pitre | d1496c3 | 2007-06-30 16:29:41 +0200 | [diff] [blame] | 135 | |
Pierre Ossman | 6f4285d | 2007-09-27 10:48:29 +0200 | [diff] [blame] | 136 | /* |
| 137 | * Adaptive polling frequency based on the assumption |
| 138 | * that an interrupt will be closely followed by more. |
| 139 | * This has a substantial benefit for network devices. |
| 140 | */ |
| 141 | if (!(host->caps & MMC_CAP_SDIO_IRQ)) { |
| 142 | if (ret > 0) |
| 143 | period /= 2; |
| 144 | else { |
| 145 | period++; |
| 146 | if (period > idle_period) |
| 147 | period = idle_period; |
| 148 | } |
| 149 | } |
| 150 | |
Robert P. J. Day | 6fee65c | 2008-03-28 14:34:47 -0700 | [diff] [blame] | 151 | set_current_state(TASK_INTERRUPTIBLE); |
Sujit Reddy Thumma | 2c4967f74 | 2012-02-04 16:14:50 -0500 | [diff] [blame] | 152 | if (host->caps & MMC_CAP_SDIO_IRQ) { |
| 153 | mmc_host_clk_hold(host); |
Nicolas Pitre | 17b759a | 2007-07-24 02:09:39 -0400 | [diff] [blame] | 154 | host->ops->enable_sdio_irq(host, 1); |
Sujit Reddy Thumma | 2c4967f74 | 2012-02-04 16:14:50 -0500 | [diff] [blame] | 155 | mmc_host_clk_release(host); |
| 156 | } |
Nicolas Pitre | d1496c3 | 2007-06-30 16:29:41 +0200 | [diff] [blame] | 157 | if (!kthread_should_stop()) |
| 158 | schedule_timeout(period); |
Robert P. J. Day | 6fee65c | 2008-03-28 14:34:47 -0700 | [diff] [blame] | 159 | set_current_state(TASK_RUNNING); |
Nicolas Pitre | d1496c3 | 2007-06-30 16:29:41 +0200 | [diff] [blame] | 160 | } while (!kthread_should_stop()); |
| 161 | |
Sujit Reddy Thumma | 2c4967f74 | 2012-02-04 16:14:50 -0500 | [diff] [blame] | 162 | if (host->caps & MMC_CAP_SDIO_IRQ) { |
| 163 | mmc_host_clk_hold(host); |
Nicolas Pitre | 17b759a | 2007-07-24 02:09:39 -0400 | [diff] [blame] | 164 | host->ops->enable_sdio_irq(host, 0); |
Sujit Reddy Thumma | 2c4967f74 | 2012-02-04 16:14:50 -0500 | [diff] [blame] | 165 | mmc_host_clk_release(host); |
| 166 | } |
Nicolas Pitre | 17b759a | 2007-07-24 02:09:39 -0400 | [diff] [blame] | 167 | |
Nicolas Pitre | d1496c3 | 2007-06-30 16:29:41 +0200 | [diff] [blame] | 168 | pr_debug("%s: IRQ thread exiting with code %d\n", |
| 169 | mmc_hostname(host), ret); |
| 170 | |
| 171 | return ret; |
| 172 | } |
| 173 | |
| 174 | static int sdio_card_irq_get(struct mmc_card *card) |
| 175 | { |
| 176 | struct mmc_host *host = card->host; |
| 177 | |
Pierre Ossman | d84075c8 | 2007-08-09 13:23:56 +0200 | [diff] [blame] | 178 | WARN_ON(!host->claimed); |
Nicolas Pitre | d1496c3 | 2007-06-30 16:29:41 +0200 | [diff] [blame] | 179 | |
| 180 | if (!host->sdio_irqs++) { |
| 181 | atomic_set(&host->sdio_irq_thread_abort, 0); |
| 182 | host->sdio_irq_thread = |
Pierre Ossman | 6501ff6 | 2008-08-31 13:42:00 +0200 | [diff] [blame] | 183 | kthread_run(sdio_irq_thread, host, "ksdioirqd/%s", |
| 184 | mmc_hostname(host)); |
Nicolas Pitre | d1496c3 | 2007-06-30 16:29:41 +0200 | [diff] [blame] | 185 | if (IS_ERR(host->sdio_irq_thread)) { |
| 186 | int err = PTR_ERR(host->sdio_irq_thread); |
| 187 | host->sdio_irqs--; |
| 188 | return err; |
| 189 | } |
| 190 | } |
| 191 | |
| 192 | return 0; |
| 193 | } |
| 194 | |
| 195 | static int sdio_card_irq_put(struct mmc_card *card) |
| 196 | { |
| 197 | struct mmc_host *host = card->host; |
| 198 | |
Pierre Ossman | d84075c8 | 2007-08-09 13:23:56 +0200 | [diff] [blame] | 199 | WARN_ON(!host->claimed); |
Nicolas Pitre | d1496c3 | 2007-06-30 16:29:41 +0200 | [diff] [blame] | 200 | BUG_ON(host->sdio_irqs < 1); |
| 201 | |
| 202 | if (!--host->sdio_irqs) { |
| 203 | atomic_set(&host->sdio_irq_thread_abort, 1); |
| 204 | kthread_stop(host->sdio_irq_thread); |
| 205 | } |
| 206 | |
| 207 | return 0; |
| 208 | } |
| 209 | |
Stefan Nilsson XK | 06e8935 | 2011-05-11 17:48:05 +0200 | [diff] [blame] | 210 | /* If there is only 1 function registered set sdio_single_irq */ |
| 211 | static void sdio_single_irq_set(struct mmc_card *card) |
| 212 | { |
| 213 | struct sdio_func *func; |
| 214 | int i; |
| 215 | |
| 216 | card->sdio_single_irq = NULL; |
| 217 | if ((card->host->caps & MMC_CAP_SDIO_IRQ) && |
Stephen Boyd | 4251740 | 2013-01-14 16:41:42 -0800 | [diff] [blame] | 218 | card->host->sdio_irqs == 1) |
Stefan Nilsson XK | 06e8935 | 2011-05-11 17:48:05 +0200 | [diff] [blame] | 219 | for (i = 0; i < card->sdio_funcs; i++) { |
Stephen Boyd | 4251740 | 2013-01-14 16:41:42 -0800 | [diff] [blame] | 220 | func = card->sdio_func[i]; |
| 221 | if (func && func->irq_handler) { |
| 222 | card->sdio_single_irq = func; |
| 223 | break; |
| 224 | } |
| 225 | } |
Stefan Nilsson XK | 06e8935 | 2011-05-11 17:48:05 +0200 | [diff] [blame] | 226 | } |
| 227 | |
Nicolas Pitre | d1496c3 | 2007-06-30 16:29:41 +0200 | [diff] [blame] | 228 | /** |
| 229 | * sdio_claim_irq - claim the IRQ for a SDIO function |
| 230 | * @func: SDIO function |
| 231 | * @handler: IRQ handler callback |
| 232 | * |
| 233 | * Claim and activate the IRQ for the given SDIO function. The provided |
| 234 | * handler will be called when that IRQ is asserted. The host is always |
| 235 | * claimed already when the handler is called so the handler must not |
| 236 | * call sdio_claim_host() nor sdio_release_host(). |
| 237 | */ |
| 238 | int sdio_claim_irq(struct sdio_func *func, sdio_irq_handler_t *handler) |
| 239 | { |
| 240 | int ret; |
| 241 | unsigned char reg; |
| 242 | |
| 243 | BUG_ON(!func); |
| 244 | BUG_ON(!func->card); |
| 245 | |
| 246 | pr_debug("SDIO: Enabling IRQ for %s...\n", sdio_func_id(func)); |
| 247 | |
| 248 | if (func->irq_handler) { |
| 249 | pr_debug("SDIO: IRQ for %s already in use.\n", sdio_func_id(func)); |
| 250 | return -EBUSY; |
| 251 | } |
| 252 | |
| 253 | ret = mmc_io_rw_direct(func->card, 0, 0, SDIO_CCCR_IENx, 0, ®); |
| 254 | if (ret) |
| 255 | return ret; |
| 256 | |
| 257 | reg |= 1 << func->num; |
| 258 | |
| 259 | reg |= 1; /* Master interrupt enable */ |
| 260 | |
| 261 | ret = mmc_io_rw_direct(func->card, 1, 0, SDIO_CCCR_IENx, reg, NULL); |
| 262 | if (ret) |
| 263 | return ret; |
| 264 | |
| 265 | func->irq_handler = handler; |
| 266 | ret = sdio_card_irq_get(func->card); |
| 267 | if (ret) |
| 268 | func->irq_handler = NULL; |
Stefan Nilsson XK | 06e8935 | 2011-05-11 17:48:05 +0200 | [diff] [blame] | 269 | sdio_single_irq_set(func->card); |
Nicolas Pitre | d1496c3 | 2007-06-30 16:29:41 +0200 | [diff] [blame] | 270 | |
| 271 | return ret; |
| 272 | } |
| 273 | EXPORT_SYMBOL_GPL(sdio_claim_irq); |
| 274 | |
| 275 | /** |
| 276 | * sdio_release_irq - release the IRQ for a SDIO function |
| 277 | * @func: SDIO function |
| 278 | * |
| 279 | * Disable and release the IRQ for the given SDIO function. |
| 280 | */ |
| 281 | int sdio_release_irq(struct sdio_func *func) |
| 282 | { |
| 283 | int ret; |
| 284 | unsigned char reg; |
| 285 | |
| 286 | BUG_ON(!func); |
| 287 | BUG_ON(!func->card); |
| 288 | |
| 289 | pr_debug("SDIO: Disabling IRQ for %s...\n", sdio_func_id(func)); |
| 290 | |
| 291 | if (func->irq_handler) { |
| 292 | func->irq_handler = NULL; |
| 293 | sdio_card_irq_put(func->card); |
Stefan Nilsson XK | 06e8935 | 2011-05-11 17:48:05 +0200 | [diff] [blame] | 294 | sdio_single_irq_set(func->card); |
Nicolas Pitre | d1496c3 | 2007-06-30 16:29:41 +0200 | [diff] [blame] | 295 | } |
| 296 | |
| 297 | ret = mmc_io_rw_direct(func->card, 0, 0, SDIO_CCCR_IENx, 0, ®); |
| 298 | if (ret) |
| 299 | return ret; |
| 300 | |
| 301 | reg &= ~(1 << func->num); |
| 302 | |
| 303 | /* Disable master interrupt with the last function interrupt */ |
| 304 | if (!(reg & 0xFE)) |
| 305 | reg = 0; |
| 306 | |
| 307 | ret = mmc_io_rw_direct(func->card, 1, 0, SDIO_CCCR_IENx, reg, NULL); |
| 308 | if (ret) |
| 309 | return ret; |
| 310 | |
| 311 | return 0; |
| 312 | } |
| 313 | EXPORT_SYMBOL_GPL(sdio_release_irq); |
| 314 | |