Commit | Line | Data |
---|---|---|
b93931a6 PO |
1 | /* |
2 | * linux/drivers/mmc/core/host.c | |
3 | * | |
4 | * Copyright (C) 2003 Russell King, All Rights Reserved. | |
ff3112f5 | 5 | * Copyright (C) 2007-2008 Pierre Ossman |
04566831 | 6 | * Copyright (C) 2010 Linus Walleij |
b93931a6 PO |
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> | |
6c56e7a0 GL |
18 | #include <linux/of.h> |
19 | #include <linux/of_gpio.h> | |
b93931a6 | 20 | #include <linux/pagemap.h> |
3ef77af1 | 21 | #include <linux/export.h> |
af8350c7 | 22 | #include <linux/leds.h> |
5a0e3ad6 | 23 | #include <linux/slab.h> |
4c2ef25f | 24 | #include <linux/suspend.h> |
b93931a6 PO |
25 | |
26 | #include <linux/mmc/host.h> | |
04566831 | 27 | #include <linux/mmc/card.h> |
6c56e7a0 | 28 | #include <linux/mmc/slot-gpio.h> |
b93931a6 PO |
29 | |
30 | #include "core.h" | |
31 | #include "host.h" | |
6fa3eb70 S |
32 | #define CARD_INIT_TIMEOUT (HZ * 5) //5s |
33 | #ifdef CONFIG_MTK_EMMC_CACHE | |
34 | /* | |
35 | * A default time for checking the need for non urgent flush OPs once MMC thread is idle. | |
36 | */ | |
37 | #define MMC_IDLE_FLUSH_TIME_MS 1500 | |
38 | #endif | |
b93931a6 PO |
39 | #define cls_dev_to_mmc_host(d) container_of(d, struct mmc_host, class_dev) |
40 | ||
41 | static void mmc_host_classdev_release(struct device *dev) | |
42 | { | |
43 | struct mmc_host *host = cls_dev_to_mmc_host(dev); | |
a7d1a1eb | 44 | mutex_destroy(&host->slot.lock); |
b93931a6 PO |
45 | kfree(host); |
46 | } | |
47 | ||
48 | static struct class mmc_host_class = { | |
49 | .name = "mmc_host", | |
50 | .dev_release = mmc_host_classdev_release, | |
51 | }; | |
52 | ||
53 | int mmc_register_host_class(void) | |
54 | { | |
55 | return class_register(&mmc_host_class); | |
56 | } | |
57 | ||
58 | void mmc_unregister_host_class(void) | |
59 | { | |
60 | class_unregister(&mmc_host_class); | |
61 | } | |
62 | ||
63 | static DEFINE_IDR(mmc_host_idr); | |
64 | static DEFINE_SPINLOCK(mmc_host_lock); | |
65 | ||
04566831 | 66 | #ifdef CONFIG_MMC_CLKGATE |
597dd9d7 SRT |
67 | static ssize_t clkgate_delay_show(struct device *dev, |
68 | struct device_attribute *attr, char *buf) | |
69 | { | |
70 | struct mmc_host *host = cls_dev_to_mmc_host(dev); | |
4137e504 | 71 | return snprintf(buf, PAGE_SIZE, "%lu\n", host->clkgate_delay); |
597dd9d7 SRT |
72 | } |
73 | ||
74 | static ssize_t clkgate_delay_store(struct device *dev, | |
75 | struct device_attribute *attr, const char *buf, size_t count) | |
76 | { | |
77 | struct mmc_host *host = cls_dev_to_mmc_host(dev); | |
78 | unsigned long flags, value; | |
79 | ||
80 | if (kstrtoul(buf, 0, &value)) | |
81 | return -EINVAL; | |
82 | ||
83 | spin_lock_irqsave(&host->clk_lock, flags); | |
84 | host->clkgate_delay = value; | |
85 | spin_unlock_irqrestore(&host->clk_lock, flags); | |
597dd9d7 SRT |
86 | return count; |
87 | } | |
04566831 LW |
88 | |
89 | /* | |
90 | * Enabling clock gating will make the core call out to the host | |
91 | * once up and once down when it performs a request or card operation | |
92 | * intermingled in any fashion. The driver will see this through | |
93 | * set_ios() operations with ios.clock field set to 0 to gate (disable) | |
94 | * the block clock, and to the old frequency to enable it again. | |
95 | */ | |
96 | static void mmc_host_clk_gate_delayed(struct mmc_host *host) | |
97 | { | |
98 | unsigned long tick_ns; | |
99 | unsigned long freq = host->ios.clock; | |
100 | unsigned long flags; | |
101 | ||
102 | if (!freq) { | |
103 | pr_debug("%s: frequency set to 0 in disable function, " | |
104 | "this means the clock is already disabled.\n", | |
105 | mmc_hostname(host)); | |
106 | return; | |
107 | } | |
108 | /* | |
109 | * New requests may have appeared while we were scheduling, | |
110 | * then there is no reason to delay the check before | |
111 | * clk_disable(). | |
112 | */ | |
113 | spin_lock_irqsave(&host->clk_lock, flags); | |
114 | ||
115 | /* | |
116 | * Delay n bus cycles (at least 8 from MMC spec) before attempting | |
117 | * to disable the MCI block clock. The reference count may have | |
118 | * gone up again after this delay due to rescheduling! | |
119 | */ | |
120 | if (!host->clk_requests) { | |
121 | spin_unlock_irqrestore(&host->clk_lock, flags); | |
122 | tick_ns = DIV_ROUND_UP(1000000000, freq); | |
123 | ndelay(host->clk_delay * tick_ns); | |
124 | } else { | |
125 | /* New users appeared while waiting for this work */ | |
126 | spin_unlock_irqrestore(&host->clk_lock, flags); | |
127 | return; | |
128 | } | |
86f315bb | 129 | mutex_lock(&host->clk_gate_mutex); |
04566831 LW |
130 | spin_lock_irqsave(&host->clk_lock, flags); |
131 | if (!host->clk_requests) { | |
132 | spin_unlock_irqrestore(&host->clk_lock, flags); | |
133 | /* This will set host->ios.clock to 0 */ | |
134 | mmc_gate_clock(host); | |
135 | spin_lock_irqsave(&host->clk_lock, flags); | |
136 | pr_debug("%s: gated MCI clock\n", mmc_hostname(host)); | |
137 | } | |
138 | spin_unlock_irqrestore(&host->clk_lock, flags); | |
86f315bb | 139 | mutex_unlock(&host->clk_gate_mutex); |
04566831 LW |
140 | } |
141 | ||
142 | /* | |
143 | * Internal work. Work to disable the clock at some later point. | |
144 | */ | |
145 | static void mmc_host_clk_gate_work(struct work_struct *work) | |
146 | { | |
147 | struct mmc_host *host = container_of(work, struct mmc_host, | |
597dd9d7 | 148 | clk_gate_work.work); |
04566831 LW |
149 | |
150 | mmc_host_clk_gate_delayed(host); | |
151 | } | |
152 | ||
153 | /** | |
08c14071 | 154 | * mmc_host_clk_hold - ungate hardware MCI clocks |
04566831 LW |
155 | * @host: host to ungate. |
156 | * | |
157 | * Makes sure the host ios.clock is restored to a non-zero value | |
158 | * past this call. Increase clock reference count and ungate clock | |
159 | * if we're the first user. | |
160 | */ | |
08c14071 | 161 | void mmc_host_clk_hold(struct mmc_host *host) |
04566831 LW |
162 | { |
163 | unsigned long flags; | |
164 | ||
597dd9d7 SRT |
165 | /* cancel any clock gating work scheduled by mmc_host_clk_release() */ |
166 | cancel_delayed_work_sync(&host->clk_gate_work); | |
86f315bb | 167 | mutex_lock(&host->clk_gate_mutex); |
04566831 LW |
168 | spin_lock_irqsave(&host->clk_lock, flags); |
169 | if (host->clk_gated) { | |
170 | spin_unlock_irqrestore(&host->clk_lock, flags); | |
171 | mmc_ungate_clock(host); | |
172 | spin_lock_irqsave(&host->clk_lock, flags); | |
173 | pr_debug("%s: ungated MCI clock\n", mmc_hostname(host)); | |
174 | } | |
175 | host->clk_requests++; | |
176 | spin_unlock_irqrestore(&host->clk_lock, flags); | |
86f315bb | 177 | mutex_unlock(&host->clk_gate_mutex); |
04566831 LW |
178 | } |
179 | ||
180 | /** | |
181 | * mmc_host_may_gate_card - check if this card may be gated | |
182 | * @card: card to check. | |
183 | */ | |
184 | static bool mmc_host_may_gate_card(struct mmc_card *card) | |
185 | { | |
186 | /* If there is no card we may gate it */ | |
187 | if (!card) | |
188 | return true; | |
189 | /* | |
190 | * Don't gate SDIO cards! These need to be clocked at all times | |
191 | * since they may be independent systems generating interrupts | |
192 | * and other events. The clock requests counter from the core will | |
193 | * go down to zero since the core does not need it, but we will not | |
194 | * gate the clock, because there is somebody out there that may still | |
195 | * be using it. | |
196 | */ | |
db993500 | 197 | return !(card->quirks & MMC_QUIRK_BROKEN_CLK_GATING); |
04566831 LW |
198 | } |
199 | ||
200 | /** | |
08c14071 | 201 | * mmc_host_clk_release - gate off hardware MCI clocks |
04566831 LW |
202 | * @host: host to gate. |
203 | * | |
204 | * Calls the host driver with ios.clock set to zero as often as possible | |
205 | * in order to gate off hardware MCI clocks. Decrease clock reference | |
206 | * count and schedule disabling of clock. | |
207 | */ | |
08c14071 | 208 | void mmc_host_clk_release(struct mmc_host *host) |
04566831 LW |
209 | { |
210 | unsigned long flags; | |
211 | ||
212 | spin_lock_irqsave(&host->clk_lock, flags); | |
213 | host->clk_requests--; | |
214 | if (mmc_host_may_gate_card(host->card) && | |
215 | !host->clk_requests) | |
3b07e9ca TH |
216 | schedule_delayed_work(&host->clk_gate_work, |
217 | msecs_to_jiffies(host->clkgate_delay)); | |
04566831 LW |
218 | spin_unlock_irqrestore(&host->clk_lock, flags); |
219 | } | |
220 | ||
221 | /** | |
222 | * mmc_host_clk_rate - get current clock frequency setting | |
223 | * @host: host to get the clock frequency for. | |
224 | * | |
225 | * Returns current clock frequency regardless of gating. | |
226 | */ | |
227 | unsigned int mmc_host_clk_rate(struct mmc_host *host) | |
228 | { | |
229 | unsigned long freq; | |
230 | unsigned long flags; | |
231 | ||
232 | spin_lock_irqsave(&host->clk_lock, flags); | |
233 | if (host->clk_gated) | |
234 | freq = host->clk_old; | |
235 | else | |
236 | freq = host->ios.clock; | |
237 | spin_unlock_irqrestore(&host->clk_lock, flags); | |
238 | return freq; | |
239 | } | |
240 | ||
241 | /** | |
242 | * mmc_host_clk_init - set up clock gating code | |
243 | * @host: host with potential clock to control | |
244 | */ | |
245 | static inline void mmc_host_clk_init(struct mmc_host *host) | |
246 | { | |
247 | host->clk_requests = 0; | |
248 | /* Hold MCI clock for 8 cycles by default */ | |
249 | host->clk_delay = 8; | |
597dd9d7 | 250 | /* |
c84f15ae | 251 | * Default clock gating delay is 0ms to avoid wasting power. |
597dd9d7 SRT |
252 | * This value can be tuned by writing into sysfs entry. |
253 | */ | |
c84f15ae | 254 | host->clkgate_delay = 0; |
04566831 | 255 | host->clk_gated = false; |
597dd9d7 | 256 | INIT_DELAYED_WORK(&host->clk_gate_work, mmc_host_clk_gate_work); |
04566831 | 257 | spin_lock_init(&host->clk_lock); |
86f315bb | 258 | mutex_init(&host->clk_gate_mutex); |
04566831 LW |
259 | } |
260 | ||
261 | /** | |
262 | * mmc_host_clk_exit - shut down clock gating code | |
263 | * @host: host with potential clock to control | |
264 | */ | |
265 | static inline void mmc_host_clk_exit(struct mmc_host *host) | |
266 | { | |
267 | /* | |
268 | * Wait for any outstanding gate and then make sure we're | |
269 | * ungated before exiting. | |
270 | */ | |
597dd9d7 | 271 | if (cancel_delayed_work_sync(&host->clk_gate_work)) |
04566831 LW |
272 | mmc_host_clk_gate_delayed(host); |
273 | if (host->clk_gated) | |
08c14071 | 274 | mmc_host_clk_hold(host); |
c288b855 LW |
275 | /* There should be only one user now */ |
276 | WARN_ON(host->clk_requests > 1); | |
04566831 LW |
277 | } |
278 | ||
597dd9d7 SRT |
279 | static inline void mmc_host_clk_sysfs_init(struct mmc_host *host) |
280 | { | |
281 | host->clkgate_delay_attr.show = clkgate_delay_show; | |
282 | host->clkgate_delay_attr.store = clkgate_delay_store; | |
283 | sysfs_attr_init(&host->clkgate_delay_attr.attr); | |
284 | host->clkgate_delay_attr.attr.name = "clkgate_delay"; | |
285 | host->clkgate_delay_attr.attr.mode = S_IRUGO | S_IWUSR; | |
286 | if (device_create_file(&host->class_dev, &host->clkgate_delay_attr)) | |
287 | pr_err("%s: Failed to create clkgate_delay sysfs entry\n", | |
288 | mmc_hostname(host)); | |
289 | } | |
04566831 LW |
290 | #else |
291 | ||
292 | static inline void mmc_host_clk_init(struct mmc_host *host) | |
293 | { | |
294 | } | |
295 | ||
296 | static inline void mmc_host_clk_exit(struct mmc_host *host) | |
297 | { | |
298 | } | |
299 | ||
597dd9d7 SRT |
300 | static inline void mmc_host_clk_sysfs_init(struct mmc_host *host) |
301 | { | |
302 | } | |
303 | ||
04566831 | 304 | #endif |
6fa3eb70 S |
305 | static void mmc_card_init_wait(struct mmc_host *mmc) |
306 | { | |
307 | //if(mmc->card) | |
308 | // return; | |
309 | if(!wait_for_completion_timeout(&mmc->card_init_done, CARD_INIT_TIMEOUT)) | |
310 | { | |
311 | kasprintf(GFP_KERNEL, "[%s]:card initiation is timeout\n", __func__); | |
312 | } | |
313 | return; | |
314 | } | |
315 | ||
316 | static void mmc_card_init_complete(struct mmc_host* mmc) | |
317 | { | |
318 | complete(&mmc->card_init_done); | |
319 | return; | |
320 | } | |
04566831 | 321 | |
6c56e7a0 GL |
322 | /** |
323 | * mmc_of_parse() - parse host's device-tree node | |
324 | * @host: host whose node should be parsed. | |
325 | * | |
326 | * To keep the rest of the MMC subsystem unaware of whether DT has been | |
327 | * used to to instantiate and configure this host instance or not, we | |
328 | * parse the properties and set respective generic mmc-host flags and | |
329 | * parameters. | |
330 | */ | |
331 | void mmc_of_parse(struct mmc_host *host) | |
332 | { | |
333 | struct device_node *np; | |
334 | u32 bus_width; | |
335 | bool explicit_inv_wp, gpio_inv_wp = false; | |
336 | enum of_gpio_flags flags; | |
337 | int len, ret, gpio; | |
338 | ||
339 | if (!host->parent || !host->parent->of_node) | |
340 | return; | |
341 | ||
342 | np = host->parent->of_node; | |
343 | ||
344 | /* "bus-width" is translated to MMC_CAP_*_BIT_DATA flags */ | |
345 | if (of_property_read_u32(np, "bus-width", &bus_width) < 0) { | |
346 | dev_dbg(host->parent, | |
347 | "\"bus-width\" property is missing, assuming 1 bit.\n"); | |
348 | bus_width = 1; | |
349 | } | |
350 | ||
351 | switch (bus_width) { | |
352 | case 8: | |
353 | host->caps |= MMC_CAP_8_BIT_DATA; | |
354 | /* Hosts capable of 8-bit transfers can also do 4 bits */ | |
355 | case 4: | |
356 | host->caps |= MMC_CAP_4_BIT_DATA; | |
357 | break; | |
358 | case 1: | |
359 | break; | |
360 | default: | |
361 | dev_err(host->parent, | |
362 | "Invalid \"bus-width\" value %ud!\n", bus_width); | |
363 | } | |
364 | ||
365 | /* f_max is obtained from the optional "max-frequency" property */ | |
366 | of_property_read_u32(np, "max-frequency", &host->f_max); | |
367 | ||
368 | /* | |
369 | * Configure CD and WP pins. They are both by default active low to | |
370 | * match the SDHCI spec. If GPIOs are provided for CD and / or WP, the | |
371 | * mmc-gpio helpers are used to attach, configure and use them. If | |
372 | * polarity inversion is specified in DT, one of MMC_CAP2_CD_ACTIVE_HIGH | |
373 | * and MMC_CAP2_RO_ACTIVE_HIGH capability-2 flags is set. If the | |
374 | * "broken-cd" property is provided, the MMC_CAP_NEEDS_POLL capability | |
375 | * is set. If the "non-removable" property is found, the | |
376 | * MMC_CAP_NONREMOVABLE capability is set and no card-detection | |
377 | * configuration is performed. | |
378 | */ | |
379 | ||
380 | /* Parse Card Detection */ | |
381 | if (of_find_property(np, "non-removable", &len)) { | |
382 | host->caps |= MMC_CAP_NONREMOVABLE; | |
383 | } else { | |
384 | bool explicit_inv_cd, gpio_inv_cd = false; | |
385 | ||
386 | explicit_inv_cd = of_property_read_bool(np, "cd-inverted"); | |
387 | ||
388 | if (of_find_property(np, "broken-cd", &len)) | |
389 | host->caps |= MMC_CAP_NEEDS_POLL; | |
390 | ||
391 | gpio = of_get_named_gpio_flags(np, "cd-gpios", 0, &flags); | |
392 | if (gpio_is_valid(gpio)) { | |
393 | if (!(flags & OF_GPIO_ACTIVE_LOW)) | |
394 | gpio_inv_cd = true; | |
395 | ||
396 | ret = mmc_gpio_request_cd(host, gpio); | |
397 | if (ret < 0) | |
398 | dev_err(host->parent, | |
399 | "Failed to request CD GPIO #%d: %d!\n", | |
400 | gpio, ret); | |
401 | else | |
402 | dev_info(host->parent, "Got CD GPIO #%d.\n", | |
403 | gpio); | |
404 | } | |
405 | ||
406 | if (explicit_inv_cd ^ gpio_inv_cd) | |
407 | host->caps2 |= MMC_CAP2_CD_ACTIVE_HIGH; | |
408 | } | |
409 | ||
410 | /* Parse Write Protection */ | |
411 | explicit_inv_wp = of_property_read_bool(np, "wp-inverted"); | |
412 | ||
413 | gpio = of_get_named_gpio_flags(np, "wp-gpios", 0, &flags); | |
414 | if (gpio_is_valid(gpio)) { | |
415 | if (!(flags & OF_GPIO_ACTIVE_LOW)) | |
416 | gpio_inv_wp = true; | |
417 | ||
418 | ret = mmc_gpio_request_ro(host, gpio); | |
419 | if (ret < 0) | |
420 | dev_err(host->parent, | |
421 | "Failed to request WP GPIO: %d!\n", ret); | |
422 | } | |
423 | if (explicit_inv_wp ^ gpio_inv_wp) | |
424 | host->caps2 |= MMC_CAP2_RO_ACTIVE_HIGH; | |
2fdb6e2d GL |
425 | |
426 | if (of_find_property(np, "cap-sd-highspeed", &len)) | |
427 | host->caps |= MMC_CAP_SD_HIGHSPEED; | |
428 | if (of_find_property(np, "cap-mmc-highspeed", &len)) | |
429 | host->caps |= MMC_CAP_MMC_HIGHSPEED; | |
430 | if (of_find_property(np, "cap-power-off-card", &len)) | |
431 | host->caps |= MMC_CAP_POWER_OFF_CARD; | |
432 | if (of_find_property(np, "cap-sdio-irq", &len)) | |
433 | host->caps |= MMC_CAP_SDIO_IRQ; | |
434 | if (of_find_property(np, "keep-power-in-suspend", &len)) | |
435 | host->pm_caps |= MMC_PM_KEEP_POWER; | |
436 | if (of_find_property(np, "enable-sdio-wakeup", &len)) | |
437 | host->pm_caps |= MMC_PM_WAKE_SDIO_IRQ; | |
6c56e7a0 GL |
438 | } |
439 | ||
440 | EXPORT_SYMBOL(mmc_of_parse); | |
441 | ||
b93931a6 PO |
442 | /** |
443 | * mmc_alloc_host - initialise the per-host structure. | |
444 | * @extra: sizeof private data structure | |
445 | * @dev: pointer to host device model structure | |
446 | * | |
447 | * Initialise the per-host structure. | |
448 | */ | |
449 | struct mmc_host *mmc_alloc_host(int extra, struct device *dev) | |
450 | { | |
ff3112f5 | 451 | int err; |
b93931a6 PO |
452 | struct mmc_host *host; |
453 | ||
be760a9d | 454 | host = kzalloc(sizeof(struct mmc_host) + extra, GFP_KERNEL); |
b93931a6 PO |
455 | if (!host) |
456 | return NULL; | |
457 | ||
d9adcc12 GL |
458 | /* scanning will be enabled when we're ready */ |
459 | host->rescan_disable = 1; | |
803d9e04 | 460 | idr_preload(GFP_KERNEL); |
ff3112f5 | 461 | spin_lock(&mmc_host_lock); |
803d9e04 TH |
462 | err = idr_alloc(&mmc_host_idr, host, 0, 0, GFP_NOWAIT); |
463 | if (err >= 0) | |
464 | host->index = err; | |
ff3112f5 | 465 | spin_unlock(&mmc_host_lock); |
803d9e04 TH |
466 | idr_preload_end(); |
467 | if (err < 0) | |
ff3112f5 PO |
468 | goto free; |
469 | ||
d1b26863 | 470 | dev_set_name(&host->class_dev, "mmc%d", host->index); |
ff3112f5 | 471 | |
b93931a6 PO |
472 | host->parent = dev; |
473 | host->class_dev.parent = dev; | |
474 | host->class_dev.class = &mmc_host_class; | |
475 | device_initialize(&host->class_dev); | |
476 | ||
04566831 | 477 | mmc_host_clk_init(host); |
6fa3eb70 S |
478 | init_completion(&host->card_init_done); |
479 | host->card_init_wait = mmc_card_init_wait; | |
480 | host->card_init_complete = mmc_card_init_complete; | |
04566831 | 481 | |
a7d1a1eb | 482 | mutex_init(&host->slot.lock); |
27410ee7 GL |
483 | host->slot.cd_irq = -EINVAL; |
484 | ||
b93931a6 PO |
485 | spin_lock_init(&host->lock); |
486 | init_waitqueue_head(&host->wq); | |
6fa3eb70 S |
487 | wake_lock_init(&host->detect_wake_lock, WAKE_LOCK_SUSPEND, |
488 | kasprintf(GFP_KERNEL, "%s_detect", mmc_hostname(host))); | |
b93931a6 | 489 | INIT_DELAYED_WORK(&host->detect, mmc_rescan); |
6fa3eb70 S |
490 | #ifdef MMC_ENABLED_EMPTY_QUEUE_FLUSH |
491 | host->flush_info.wq = create_singlethread_workqueue("flush_wq"); | |
492 | INIT_DELAYED_WORK(&host->flush_info.idle_time_dw, mmc_start_idle_time_flush); | |
493 | host->flush_info.time_to_start_flush_ms = MMC_IDLE_FLUSH_TIME_MS; | |
494 | #endif | |
81ca03a0 | 495 | #ifdef CONFIG_PM |
4c2ef25f | 496 | host->pm_notify.notifier_call = mmc_pm_notify; |
81ca03a0 | 497 | #endif |
b93931a6 PO |
498 | |
499 | /* | |
500 | * By default, hosts do not support SGIO or large requests. | |
501 | * They have to set these according to their abilities. | |
502 | */ | |
a36274e0 | 503 | host->max_segs = 1; |
b93931a6 PO |
504 | host->max_seg_size = PAGE_CACHE_SIZE; |
505 | ||
506 | host->max_req_size = PAGE_CACHE_SIZE; | |
507 | host->max_blk_size = 512; | |
508 | host->max_blk_count = PAGE_CACHE_SIZE / 512; | |
509 | ||
510 | return host; | |
ff3112f5 PO |
511 | |
512 | free: | |
513 | kfree(host); | |
514 | return NULL; | |
b93931a6 PO |
515 | } |
516 | ||
517 | EXPORT_SYMBOL(mmc_alloc_host); | |
518 | ||
519 | /** | |
520 | * mmc_add_host - initialise host hardware | |
521 | * @host: mmc host | |
67a61c48 PO |
522 | * |
523 | * Register the host with the driver model. The host must be | |
524 | * prepared to start servicing requests before this function | |
525 | * completes. | |
b93931a6 PO |
526 | */ |
527 | int mmc_add_host(struct mmc_host *host) | |
528 | { | |
529 | int err; | |
530 | ||
17b759af NP |
531 | WARN_ON((host->caps & MMC_CAP_SDIO_IRQ) && |
532 | !host->ops->enable_sdio_irq); | |
533 | ||
b93931a6 PO |
534 | err = device_add(&host->class_dev); |
535 | if (err) | |
536 | return err; | |
537 | ||
f317dfeb WS |
538 | led_trigger_register_simple(dev_name(&host->class_dev), &host->led); |
539 | ||
6edd8ee6 HS |
540 | #ifdef CONFIG_DEBUG_FS |
541 | mmc_add_host_debugfs(host); | |
542 | #endif | |
597dd9d7 | 543 | mmc_host_clk_sysfs_init(host); |
6edd8ee6 | 544 | |
b93931a6 | 545 | mmc_start_host(host); |
6fa3eb70 S |
546 | if (!(host->pm_flags & MMC_PM_IGNORE_PM_NOTIFY)) |
547 | register_pm_notifier(&host->pm_notify); | |
b93931a6 PO |
548 | |
549 | return 0; | |
550 | } | |
551 | ||
552 | EXPORT_SYMBOL(mmc_add_host); | |
553 | ||
554 | /** | |
555 | * mmc_remove_host - remove host hardware | |
556 | * @host: mmc host | |
557 | * | |
558 | * Unregister and remove all cards associated with this host, | |
67a61c48 PO |
559 | * and power down the MMC bus. No new requests will be issued |
560 | * after this function has returned. | |
b93931a6 PO |
561 | */ |
562 | void mmc_remove_host(struct mmc_host *host) | |
563 | { | |
6fa3eb70 S |
564 | if (!(host->pm_flags & MMC_PM_IGNORE_PM_NOTIFY)) |
565 | unregister_pm_notifier(&host->pm_notify); | |
566 | ||
b93931a6 PO |
567 | mmc_stop_host(host); |
568 | ||
6edd8ee6 HS |
569 | #ifdef CONFIG_DEBUG_FS |
570 | mmc_remove_host_debugfs(host); | |
571 | #endif | |
572 | ||
b93931a6 PO |
573 | device_del(&host->class_dev); |
574 | ||
77f1fd6e | 575 | led_trigger_unregister_simple(host->led); |
04566831 LW |
576 | |
577 | mmc_host_clk_exit(host); | |
b93931a6 PO |
578 | } |
579 | ||
580 | EXPORT_SYMBOL(mmc_remove_host); | |
581 | ||
582 | /** | |
583 | * mmc_free_host - free the host structure | |
584 | * @host: mmc host | |
585 | * | |
586 | * Free the host once all references to it have been dropped. | |
587 | */ | |
588 | void mmc_free_host(struct mmc_host *host) | |
589 | { | |
ff3112f5 PO |
590 | spin_lock(&mmc_host_lock); |
591 | idr_remove(&mmc_host_idr, host->index); | |
592 | spin_unlock(&mmc_host_lock); | |
6fa3eb70 | 593 | wake_lock_destroy(&host->detect_wake_lock); |
ff3112f5 | 594 | |
b93931a6 PO |
595 | put_device(&host->class_dev); |
596 | } | |
597 | ||
598 | EXPORT_SYMBOL(mmc_free_host); |