Pierre Ossman | b93931a | 2007-05-19 14:06:24 +0200 | [diff] [blame] | 1 | /* |
| 2 | * linux/drivers/mmc/core/host.c |
| 3 | * |
| 4 | * Copyright (C) 2003 Russell King, All Rights Reserved. |
Pierre Ossman | ff3112f | 2008-03-08 23:43:19 +0100 | [diff] [blame] | 5 | * Copyright (C) 2007-2008 Pierre Ossman |
Linus Walleij | 0456683 | 2010-11-08 21:36:50 -0500 | [diff] [blame] | 6 | * Copyright (C) 2010 Linus Walleij |
Pierre Ossman | b93931a | 2007-05-19 14:06:24 +0200 | [diff] [blame] | 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 version 2 as |
| 10 | * published by the Free Software Foundation. |
| 11 | * |
| 12 | * MMC host class device management |
| 13 | */ |
| 14 | |
| 15 | #include <linux/device.h> |
| 16 | #include <linux/err.h> |
| 17 | #include <linux/idr.h> |
| 18 | #include <linux/pagemap.h> |
Paul Gortmaker | 3ef77af | 2011-07-10 12:42:00 -0400 | [diff] [blame] | 19 | #include <linux/export.h> |
Pierre Ossman | af8350c | 2007-09-24 07:15:48 +0200 | [diff] [blame] | 20 | #include <linux/leds.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 21 | #include <linux/slab.h> |
Maxim Levitsky | 4c2ef25 | 2010-08-10 18:01:41 -0700 | [diff] [blame] | 22 | #include <linux/suspend.h> |
Pierre Ossman | b93931a | 2007-05-19 14:06:24 +0200 | [diff] [blame] | 23 | |
| 24 | #include <linux/mmc/host.h> |
Linus Walleij | 0456683 | 2010-11-08 21:36:50 -0500 | [diff] [blame] | 25 | #include <linux/mmc/card.h> |
Pierre Ossman | b93931a | 2007-05-19 14:06:24 +0200 | [diff] [blame] | 26 | |
| 27 | #include "core.h" |
| 28 | #include "host.h" |
| 29 | |
| 30 | #define cls_dev_to_mmc_host(d) container_of(d, struct mmc_host, class_dev) |
| 31 | |
| 32 | static void mmc_host_classdev_release(struct device *dev) |
| 33 | { |
| 34 | struct mmc_host *host = cls_dev_to_mmc_host(dev); |
Guennadi Liakhovetski | a7d1a1e | 2012-05-01 16:51:38 +0200 | [diff] [blame] | 35 | mutex_destroy(&host->slot.lock); |
Pierre Ossman | b93931a | 2007-05-19 14:06:24 +0200 | [diff] [blame] | 36 | kfree(host); |
| 37 | } |
| 38 | |
| 39 | static struct class mmc_host_class = { |
| 40 | .name = "mmc_host", |
| 41 | .dev_release = mmc_host_classdev_release, |
| 42 | }; |
| 43 | |
| 44 | int mmc_register_host_class(void) |
| 45 | { |
| 46 | return class_register(&mmc_host_class); |
| 47 | } |
| 48 | |
| 49 | void mmc_unregister_host_class(void) |
| 50 | { |
| 51 | class_unregister(&mmc_host_class); |
| 52 | } |
| 53 | |
| 54 | static DEFINE_IDR(mmc_host_idr); |
| 55 | static DEFINE_SPINLOCK(mmc_host_lock); |
| 56 | |
Linus Walleij | 0456683 | 2010-11-08 21:36:50 -0500 | [diff] [blame] | 57 | #ifdef CONFIG_MMC_CLKGATE |
Sujit Reddy Thumma | 597dd9d79 | 2011-11-14 13:53:29 +0530 | [diff] [blame] | 58 | static ssize_t clkgate_delay_show(struct device *dev, |
| 59 | struct device_attribute *attr, char *buf) |
| 60 | { |
| 61 | struct mmc_host *host = cls_dev_to_mmc_host(dev); |
Stephen Boyd | 4137e50 | 2011-12-05 10:28:44 -0800 | [diff] [blame] | 62 | return snprintf(buf, PAGE_SIZE, "%lu\n", host->clkgate_delay); |
Sujit Reddy Thumma | 597dd9d79 | 2011-11-14 13:53:29 +0530 | [diff] [blame] | 63 | } |
| 64 | |
| 65 | static ssize_t clkgate_delay_store(struct device *dev, |
| 66 | struct device_attribute *attr, const char *buf, size_t count) |
| 67 | { |
| 68 | struct mmc_host *host = cls_dev_to_mmc_host(dev); |
| 69 | unsigned long flags, value; |
| 70 | |
| 71 | if (kstrtoul(buf, 0, &value)) |
| 72 | return -EINVAL; |
| 73 | |
| 74 | spin_lock_irqsave(&host->clk_lock, flags); |
| 75 | host->clkgate_delay = value; |
| 76 | spin_unlock_irqrestore(&host->clk_lock, flags); |
Sujit Reddy Thumma | 597dd9d79 | 2011-11-14 13:53:29 +0530 | [diff] [blame] | 77 | return count; |
| 78 | } |
Linus Walleij | 0456683 | 2010-11-08 21:36:50 -0500 | [diff] [blame] | 79 | |
| 80 | /* |
| 81 | * Enabling clock gating will make the core call out to the host |
| 82 | * once up and once down when it performs a request or card operation |
| 83 | * intermingled in any fashion. The driver will see this through |
| 84 | * set_ios() operations with ios.clock field set to 0 to gate (disable) |
| 85 | * the block clock, and to the old frequency to enable it again. |
| 86 | */ |
| 87 | static void mmc_host_clk_gate_delayed(struct mmc_host *host) |
| 88 | { |
| 89 | unsigned long tick_ns; |
| 90 | unsigned long freq = host->ios.clock; |
| 91 | unsigned long flags; |
| 92 | |
| 93 | if (!freq) { |
| 94 | pr_debug("%s: frequency set to 0 in disable function, " |
| 95 | "this means the clock is already disabled.\n", |
| 96 | mmc_hostname(host)); |
| 97 | return; |
| 98 | } |
| 99 | /* |
| 100 | * New requests may have appeared while we were scheduling, |
| 101 | * then there is no reason to delay the check before |
| 102 | * clk_disable(). |
| 103 | */ |
| 104 | spin_lock_irqsave(&host->clk_lock, flags); |
| 105 | |
| 106 | /* |
| 107 | * Delay n bus cycles (at least 8 from MMC spec) before attempting |
| 108 | * to disable the MCI block clock. The reference count may have |
| 109 | * gone up again after this delay due to rescheduling! |
| 110 | */ |
| 111 | if (!host->clk_requests) { |
| 112 | spin_unlock_irqrestore(&host->clk_lock, flags); |
| 113 | tick_ns = DIV_ROUND_UP(1000000000, freq); |
| 114 | ndelay(host->clk_delay * tick_ns); |
| 115 | } else { |
| 116 | /* New users appeared while waiting for this work */ |
| 117 | spin_unlock_irqrestore(&host->clk_lock, flags); |
| 118 | return; |
| 119 | } |
Chris Ball | 86f315b | 2011-05-16 11:32:26 -0400 | [diff] [blame] | 120 | mutex_lock(&host->clk_gate_mutex); |
Linus Walleij | 0456683 | 2010-11-08 21:36:50 -0500 | [diff] [blame] | 121 | spin_lock_irqsave(&host->clk_lock, flags); |
| 122 | if (!host->clk_requests) { |
| 123 | spin_unlock_irqrestore(&host->clk_lock, flags); |
| 124 | /* This will set host->ios.clock to 0 */ |
| 125 | mmc_gate_clock(host); |
| 126 | spin_lock_irqsave(&host->clk_lock, flags); |
| 127 | pr_debug("%s: gated MCI clock\n", mmc_hostname(host)); |
| 128 | } |
| 129 | spin_unlock_irqrestore(&host->clk_lock, flags); |
Chris Ball | 86f315b | 2011-05-16 11:32:26 -0400 | [diff] [blame] | 130 | mutex_unlock(&host->clk_gate_mutex); |
Linus Walleij | 0456683 | 2010-11-08 21:36:50 -0500 | [diff] [blame] | 131 | } |
| 132 | |
| 133 | /* |
| 134 | * Internal work. Work to disable the clock at some later point. |
| 135 | */ |
| 136 | static void mmc_host_clk_gate_work(struct work_struct *work) |
| 137 | { |
| 138 | struct mmc_host *host = container_of(work, struct mmc_host, |
Sujit Reddy Thumma | 597dd9d79 | 2011-11-14 13:53:29 +0530 | [diff] [blame] | 139 | clk_gate_work.work); |
Linus Walleij | 0456683 | 2010-11-08 21:36:50 -0500 | [diff] [blame] | 140 | |
| 141 | mmc_host_clk_gate_delayed(host); |
| 142 | } |
| 143 | |
| 144 | /** |
Mika Westerberg | 08c1407 | 2011-08-18 15:23:47 +0300 | [diff] [blame] | 145 | * mmc_host_clk_hold - ungate hardware MCI clocks |
Linus Walleij | 0456683 | 2010-11-08 21:36:50 -0500 | [diff] [blame] | 146 | * @host: host to ungate. |
| 147 | * |
| 148 | * Makes sure the host ios.clock is restored to a non-zero value |
| 149 | * past this call. Increase clock reference count and ungate clock |
| 150 | * if we're the first user. |
| 151 | */ |
Mika Westerberg | 08c1407 | 2011-08-18 15:23:47 +0300 | [diff] [blame] | 152 | void mmc_host_clk_hold(struct mmc_host *host) |
Linus Walleij | 0456683 | 2010-11-08 21:36:50 -0500 | [diff] [blame] | 153 | { |
| 154 | unsigned long flags; |
| 155 | |
Sujit Reddy Thumma | 597dd9d79 | 2011-11-14 13:53:29 +0530 | [diff] [blame] | 156 | /* cancel any clock gating work scheduled by mmc_host_clk_release() */ |
| 157 | cancel_delayed_work_sync(&host->clk_gate_work); |
Chris Ball | 86f315b | 2011-05-16 11:32:26 -0400 | [diff] [blame] | 158 | mutex_lock(&host->clk_gate_mutex); |
Linus Walleij | 0456683 | 2010-11-08 21:36:50 -0500 | [diff] [blame] | 159 | spin_lock_irqsave(&host->clk_lock, flags); |
| 160 | if (host->clk_gated) { |
| 161 | spin_unlock_irqrestore(&host->clk_lock, flags); |
| 162 | mmc_ungate_clock(host); |
| 163 | spin_lock_irqsave(&host->clk_lock, flags); |
| 164 | pr_debug("%s: ungated MCI clock\n", mmc_hostname(host)); |
| 165 | } |
| 166 | host->clk_requests++; |
| 167 | spin_unlock_irqrestore(&host->clk_lock, flags); |
Chris Ball | 86f315b | 2011-05-16 11:32:26 -0400 | [diff] [blame] | 168 | mutex_unlock(&host->clk_gate_mutex); |
Linus Walleij | 0456683 | 2010-11-08 21:36:50 -0500 | [diff] [blame] | 169 | } |
| 170 | |
| 171 | /** |
| 172 | * mmc_host_may_gate_card - check if this card may be gated |
| 173 | * @card: card to check. |
| 174 | */ |
| 175 | static bool mmc_host_may_gate_card(struct mmc_card *card) |
| 176 | { |
| 177 | /* If there is no card we may gate it */ |
| 178 | if (!card) |
| 179 | return true; |
| 180 | /* |
| 181 | * Don't gate SDIO cards! These need to be clocked at all times |
| 182 | * since they may be independent systems generating interrupts |
| 183 | * and other events. The clock requests counter from the core will |
| 184 | * go down to zero since the core does not need it, but we will not |
| 185 | * gate the clock, because there is somebody out there that may still |
| 186 | * be using it. |
| 187 | */ |
Pierre Tardy | db99350 | 2011-02-06 19:03:47 +0100 | [diff] [blame] | 188 | return !(card->quirks & MMC_QUIRK_BROKEN_CLK_GATING); |
Linus Walleij | 0456683 | 2010-11-08 21:36:50 -0500 | [diff] [blame] | 189 | } |
| 190 | |
| 191 | /** |
Mika Westerberg | 08c1407 | 2011-08-18 15:23:47 +0300 | [diff] [blame] | 192 | * mmc_host_clk_release - gate off hardware MCI clocks |
Linus Walleij | 0456683 | 2010-11-08 21:36:50 -0500 | [diff] [blame] | 193 | * @host: host to gate. |
| 194 | * |
| 195 | * Calls the host driver with ios.clock set to zero as often as possible |
| 196 | * in order to gate off hardware MCI clocks. Decrease clock reference |
| 197 | * count and schedule disabling of clock. |
| 198 | */ |
Mika Westerberg | 08c1407 | 2011-08-18 15:23:47 +0300 | [diff] [blame] | 199 | void mmc_host_clk_release(struct mmc_host *host) |
Linus Walleij | 0456683 | 2010-11-08 21:36:50 -0500 | [diff] [blame] | 200 | { |
| 201 | unsigned long flags; |
| 202 | |
| 203 | spin_lock_irqsave(&host->clk_lock, flags); |
| 204 | host->clk_requests--; |
| 205 | if (mmc_host_may_gate_card(host->card) && |
| 206 | !host->clk_requests) |
Tejun Heo | 3b07e9c | 2012-08-20 14:51:24 -0700 | [diff] [blame] | 207 | schedule_delayed_work(&host->clk_gate_work, |
| 208 | msecs_to_jiffies(host->clkgate_delay)); |
Linus Walleij | 0456683 | 2010-11-08 21:36:50 -0500 | [diff] [blame] | 209 | spin_unlock_irqrestore(&host->clk_lock, flags); |
| 210 | } |
| 211 | |
| 212 | /** |
| 213 | * mmc_host_clk_rate - get current clock frequency setting |
| 214 | * @host: host to get the clock frequency for. |
| 215 | * |
| 216 | * Returns current clock frequency regardless of gating. |
| 217 | */ |
| 218 | unsigned int mmc_host_clk_rate(struct mmc_host *host) |
| 219 | { |
| 220 | unsigned long freq; |
| 221 | unsigned long flags; |
| 222 | |
| 223 | spin_lock_irqsave(&host->clk_lock, flags); |
| 224 | if (host->clk_gated) |
| 225 | freq = host->clk_old; |
| 226 | else |
| 227 | freq = host->ios.clock; |
| 228 | spin_unlock_irqrestore(&host->clk_lock, flags); |
| 229 | return freq; |
| 230 | } |
| 231 | |
| 232 | /** |
| 233 | * mmc_host_clk_init - set up clock gating code |
| 234 | * @host: host with potential clock to control |
| 235 | */ |
| 236 | static inline void mmc_host_clk_init(struct mmc_host *host) |
| 237 | { |
| 238 | host->clk_requests = 0; |
| 239 | /* Hold MCI clock for 8 cycles by default */ |
| 240 | host->clk_delay = 8; |
Sujit Reddy Thumma | 597dd9d79 | 2011-11-14 13:53:29 +0530 | [diff] [blame] | 241 | /* |
Guennadi Liakhovetski | c84f15a | 2012-02-23 11:22:29 +0100 | [diff] [blame] | 242 | * Default clock gating delay is 0ms to avoid wasting power. |
Sujit Reddy Thumma | 597dd9d79 | 2011-11-14 13:53:29 +0530 | [diff] [blame] | 243 | * This value can be tuned by writing into sysfs entry. |
| 244 | */ |
Guennadi Liakhovetski | c84f15a | 2012-02-23 11:22:29 +0100 | [diff] [blame] | 245 | host->clkgate_delay = 0; |
Linus Walleij | 0456683 | 2010-11-08 21:36:50 -0500 | [diff] [blame] | 246 | host->clk_gated = false; |
Sujit Reddy Thumma | 597dd9d79 | 2011-11-14 13:53:29 +0530 | [diff] [blame] | 247 | INIT_DELAYED_WORK(&host->clk_gate_work, mmc_host_clk_gate_work); |
Linus Walleij | 0456683 | 2010-11-08 21:36:50 -0500 | [diff] [blame] | 248 | spin_lock_init(&host->clk_lock); |
Chris Ball | 86f315b | 2011-05-16 11:32:26 -0400 | [diff] [blame] | 249 | mutex_init(&host->clk_gate_mutex); |
Linus Walleij | 0456683 | 2010-11-08 21:36:50 -0500 | [diff] [blame] | 250 | } |
| 251 | |
| 252 | /** |
| 253 | * mmc_host_clk_exit - shut down clock gating code |
| 254 | * @host: host with potential clock to control |
| 255 | */ |
| 256 | static inline void mmc_host_clk_exit(struct mmc_host *host) |
| 257 | { |
| 258 | /* |
| 259 | * Wait for any outstanding gate and then make sure we're |
| 260 | * ungated before exiting. |
| 261 | */ |
Sujit Reddy Thumma | 597dd9d79 | 2011-11-14 13:53:29 +0530 | [diff] [blame] | 262 | if (cancel_delayed_work_sync(&host->clk_gate_work)) |
Linus Walleij | 0456683 | 2010-11-08 21:36:50 -0500 | [diff] [blame] | 263 | mmc_host_clk_gate_delayed(host); |
| 264 | if (host->clk_gated) |
Mika Westerberg | 08c1407 | 2011-08-18 15:23:47 +0300 | [diff] [blame] | 265 | mmc_host_clk_hold(host); |
Linus Walleij | c288b85 | 2010-12-22 09:50:12 +0100 | [diff] [blame] | 266 | /* There should be only one user now */ |
| 267 | WARN_ON(host->clk_requests > 1); |
Linus Walleij | 0456683 | 2010-11-08 21:36:50 -0500 | [diff] [blame] | 268 | } |
| 269 | |
Sujit Reddy Thumma | 597dd9d79 | 2011-11-14 13:53:29 +0530 | [diff] [blame] | 270 | static inline void mmc_host_clk_sysfs_init(struct mmc_host *host) |
| 271 | { |
| 272 | host->clkgate_delay_attr.show = clkgate_delay_show; |
| 273 | host->clkgate_delay_attr.store = clkgate_delay_store; |
| 274 | sysfs_attr_init(&host->clkgate_delay_attr.attr); |
| 275 | host->clkgate_delay_attr.attr.name = "clkgate_delay"; |
| 276 | host->clkgate_delay_attr.attr.mode = S_IRUGO | S_IWUSR; |
| 277 | if (device_create_file(&host->class_dev, &host->clkgate_delay_attr)) |
| 278 | pr_err("%s: Failed to create clkgate_delay sysfs entry\n", |
| 279 | mmc_hostname(host)); |
| 280 | } |
Linus Walleij | 0456683 | 2010-11-08 21:36:50 -0500 | [diff] [blame] | 281 | #else |
| 282 | |
| 283 | static inline void mmc_host_clk_init(struct mmc_host *host) |
| 284 | { |
| 285 | } |
| 286 | |
| 287 | static inline void mmc_host_clk_exit(struct mmc_host *host) |
| 288 | { |
| 289 | } |
| 290 | |
Sujit Reddy Thumma | 597dd9d79 | 2011-11-14 13:53:29 +0530 | [diff] [blame] | 291 | static inline void mmc_host_clk_sysfs_init(struct mmc_host *host) |
| 292 | { |
| 293 | } |
| 294 | |
Linus Walleij | 0456683 | 2010-11-08 21:36:50 -0500 | [diff] [blame] | 295 | #endif |
| 296 | |
Pierre Ossman | b93931a | 2007-05-19 14:06:24 +0200 | [diff] [blame] | 297 | /** |
| 298 | * mmc_alloc_host - initialise the per-host structure. |
| 299 | * @extra: sizeof private data structure |
| 300 | * @dev: pointer to host device model structure |
| 301 | * |
| 302 | * Initialise the per-host structure. |
| 303 | */ |
| 304 | struct mmc_host *mmc_alloc_host(int extra, struct device *dev) |
| 305 | { |
Pierre Ossman | ff3112f | 2008-03-08 23:43:19 +0100 | [diff] [blame] | 306 | int err; |
Pierre Ossman | b93931a | 2007-05-19 14:06:24 +0200 | [diff] [blame] | 307 | struct mmc_host *host; |
| 308 | |
Pierre Ossman | ff3112f | 2008-03-08 23:43:19 +0100 | [diff] [blame] | 309 | if (!idr_pre_get(&mmc_host_idr, GFP_KERNEL)) |
| 310 | return NULL; |
| 311 | |
Mariusz Kozlowski | be760a9 | 2007-08-10 14:00:50 -0700 | [diff] [blame] | 312 | host = kzalloc(sizeof(struct mmc_host) + extra, GFP_KERNEL); |
Pierre Ossman | b93931a | 2007-05-19 14:06:24 +0200 | [diff] [blame] | 313 | if (!host) |
| 314 | return NULL; |
| 315 | |
Guennadi Liakhovetski | d9adcc1 | 2012-06-14 10:17:39 +0200 | [diff] [blame] | 316 | /* scanning will be enabled when we're ready */ |
| 317 | host->rescan_disable = 1; |
Pierre Ossman | ff3112f | 2008-03-08 23:43:19 +0100 | [diff] [blame] | 318 | spin_lock(&mmc_host_lock); |
| 319 | err = idr_get_new(&mmc_host_idr, host, &host->index); |
| 320 | spin_unlock(&mmc_host_lock); |
| 321 | if (err) |
| 322 | goto free; |
| 323 | |
Kay Sievers | d1b2686 | 2008-11-08 21:37:46 +0100 | [diff] [blame] | 324 | dev_set_name(&host->class_dev, "mmc%d", host->index); |
Pierre Ossman | ff3112f | 2008-03-08 23:43:19 +0100 | [diff] [blame] | 325 | |
Pierre Ossman | b93931a | 2007-05-19 14:06:24 +0200 | [diff] [blame] | 326 | host->parent = dev; |
| 327 | host->class_dev.parent = dev; |
| 328 | host->class_dev.class = &mmc_host_class; |
| 329 | device_initialize(&host->class_dev); |
| 330 | |
Linus Walleij | 0456683 | 2010-11-08 21:36:50 -0500 | [diff] [blame] | 331 | mmc_host_clk_init(host); |
| 332 | |
Guennadi Liakhovetski | a7d1a1e | 2012-05-01 16:51:38 +0200 | [diff] [blame] | 333 | mutex_init(&host->slot.lock); |
Guennadi Liakhovetski | 27410ee | 2012-05-01 15:40:15 +0200 | [diff] [blame] | 334 | host->slot.cd_irq = -EINVAL; |
| 335 | |
Pierre Ossman | b93931a | 2007-05-19 14:06:24 +0200 | [diff] [blame] | 336 | spin_lock_init(&host->lock); |
| 337 | init_waitqueue_head(&host->wq); |
| 338 | INIT_DELAYED_WORK(&host->detect, mmc_rescan); |
Uwe Kleine-König | 81ca03a | 2010-08-18 09:25:38 -0700 | [diff] [blame] | 339 | #ifdef CONFIG_PM |
Maxim Levitsky | 4c2ef25 | 2010-08-10 18:01:41 -0700 | [diff] [blame] | 340 | host->pm_notify.notifier_call = mmc_pm_notify; |
Uwe Kleine-König | 81ca03a | 2010-08-18 09:25:38 -0700 | [diff] [blame] | 341 | #endif |
Pierre Ossman | b93931a | 2007-05-19 14:06:24 +0200 | [diff] [blame] | 342 | |
| 343 | /* |
| 344 | * By default, hosts do not support SGIO or large requests. |
| 345 | * They have to set these according to their abilities. |
| 346 | */ |
Martin K. Petersen | a36274e | 2010-09-10 01:33:59 -0400 | [diff] [blame] | 347 | host->max_segs = 1; |
Pierre Ossman | b93931a | 2007-05-19 14:06:24 +0200 | [diff] [blame] | 348 | host->max_seg_size = PAGE_CACHE_SIZE; |
| 349 | |
| 350 | host->max_req_size = PAGE_CACHE_SIZE; |
| 351 | host->max_blk_size = 512; |
| 352 | host->max_blk_count = PAGE_CACHE_SIZE / 512; |
| 353 | |
| 354 | return host; |
Pierre Ossman | ff3112f | 2008-03-08 23:43:19 +0100 | [diff] [blame] | 355 | |
| 356 | free: |
| 357 | kfree(host); |
| 358 | return NULL; |
Pierre Ossman | b93931a | 2007-05-19 14:06:24 +0200 | [diff] [blame] | 359 | } |
| 360 | |
| 361 | EXPORT_SYMBOL(mmc_alloc_host); |
| 362 | |
| 363 | /** |
| 364 | * mmc_add_host - initialise host hardware |
| 365 | * @host: mmc host |
Pierre Ossman | 67a61c4 | 2007-07-11 20:22:11 +0200 | [diff] [blame] | 366 | * |
| 367 | * Register the host with the driver model. The host must be |
| 368 | * prepared to start servicing requests before this function |
| 369 | * completes. |
Pierre Ossman | b93931a | 2007-05-19 14:06:24 +0200 | [diff] [blame] | 370 | */ |
| 371 | int mmc_add_host(struct mmc_host *host) |
| 372 | { |
| 373 | int err; |
| 374 | |
Nicolas Pitre | 17b759a | 2007-07-24 02:09:39 -0400 | [diff] [blame] | 375 | WARN_ON((host->caps & MMC_CAP_SDIO_IRQ) && |
| 376 | !host->ops->enable_sdio_irq); |
| 377 | |
Pierre Ossman | b93931a | 2007-05-19 14:06:24 +0200 | [diff] [blame] | 378 | err = device_add(&host->class_dev); |
| 379 | if (err) |
| 380 | return err; |
| 381 | |
Wolfram Sang | f317dfe | 2011-04-11 06:11:29 +0200 | [diff] [blame] | 382 | led_trigger_register_simple(dev_name(&host->class_dev), &host->led); |
| 383 | |
Haavard Skinnemoen | 6edd8ee | 2008-07-24 14:18:57 +0200 | [diff] [blame] | 384 | #ifdef CONFIG_DEBUG_FS |
| 385 | mmc_add_host_debugfs(host); |
| 386 | #endif |
Sujit Reddy Thumma | 597dd9d79 | 2011-11-14 13:53:29 +0530 | [diff] [blame] | 387 | mmc_host_clk_sysfs_init(host); |
Haavard Skinnemoen | 6edd8ee | 2008-07-24 14:18:57 +0200 | [diff] [blame] | 388 | |
Pierre Ossman | b93931a | 2007-05-19 14:06:24 +0200 | [diff] [blame] | 389 | mmc_start_host(host); |
Maxim Levitsky | 4c2ef25 | 2010-08-10 18:01:41 -0700 | [diff] [blame] | 390 | register_pm_notifier(&host->pm_notify); |
Pierre Ossman | b93931a | 2007-05-19 14:06:24 +0200 | [diff] [blame] | 391 | |
| 392 | return 0; |
| 393 | } |
| 394 | |
| 395 | EXPORT_SYMBOL(mmc_add_host); |
| 396 | |
| 397 | /** |
| 398 | * mmc_remove_host - remove host hardware |
| 399 | * @host: mmc host |
| 400 | * |
| 401 | * Unregister and remove all cards associated with this host, |
Pierre Ossman | 67a61c4 | 2007-07-11 20:22:11 +0200 | [diff] [blame] | 402 | * and power down the MMC bus. No new requests will be issued |
| 403 | * after this function has returned. |
Pierre Ossman | b93931a | 2007-05-19 14:06:24 +0200 | [diff] [blame] | 404 | */ |
| 405 | void mmc_remove_host(struct mmc_host *host) |
| 406 | { |
Maxim Levitsky | 4c2ef25 | 2010-08-10 18:01:41 -0700 | [diff] [blame] | 407 | unregister_pm_notifier(&host->pm_notify); |
Pierre Ossman | b93931a | 2007-05-19 14:06:24 +0200 | [diff] [blame] | 408 | mmc_stop_host(host); |
| 409 | |
Haavard Skinnemoen | 6edd8ee | 2008-07-24 14:18:57 +0200 | [diff] [blame] | 410 | #ifdef CONFIG_DEBUG_FS |
| 411 | mmc_remove_host_debugfs(host); |
| 412 | #endif |
| 413 | |
Pierre Ossman | b93931a | 2007-05-19 14:06:24 +0200 | [diff] [blame] | 414 | device_del(&host->class_dev); |
| 415 | |
Pierre Ossman | 77f1fd6 | 2007-10-12 22:48:46 +0200 | [diff] [blame] | 416 | led_trigger_unregister_simple(host->led); |
Linus Walleij | 0456683 | 2010-11-08 21:36:50 -0500 | [diff] [blame] | 417 | |
| 418 | mmc_host_clk_exit(host); |
Pierre Ossman | b93931a | 2007-05-19 14:06:24 +0200 | [diff] [blame] | 419 | } |
| 420 | |
| 421 | EXPORT_SYMBOL(mmc_remove_host); |
| 422 | |
| 423 | /** |
| 424 | * mmc_free_host - free the host structure |
| 425 | * @host: mmc host |
| 426 | * |
| 427 | * Free the host once all references to it have been dropped. |
| 428 | */ |
| 429 | void mmc_free_host(struct mmc_host *host) |
| 430 | { |
Pierre Ossman | ff3112f | 2008-03-08 23:43:19 +0100 | [diff] [blame] | 431 | spin_lock(&mmc_host_lock); |
| 432 | idr_remove(&mmc_host_idr, host->index); |
| 433 | spin_unlock(&mmc_host_lock); |
| 434 | |
Pierre Ossman | b93931a | 2007-05-19 14:06:24 +0200 | [diff] [blame] | 435 | put_device(&host->class_dev); |
| 436 | } |
| 437 | |
| 438 | EXPORT_SYMBOL(mmc_free_host); |