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" | |
32 | ||
33 | #define cls_dev_to_mmc_host(d) container_of(d, struct mmc_host, class_dev) | |
34 | ||
35 | static void mmc_host_classdev_release(struct device *dev) | |
36 | { | |
37 | struct mmc_host *host = cls_dev_to_mmc_host(dev); | |
a7d1a1eb | 38 | mutex_destroy(&host->slot.lock); |
b93931a6 PO |
39 | kfree(host); |
40 | } | |
41 | ||
42 | static struct class mmc_host_class = { | |
43 | .name = "mmc_host", | |
44 | .dev_release = mmc_host_classdev_release, | |
45 | }; | |
46 | ||
47 | int mmc_register_host_class(void) | |
48 | { | |
49 | return class_register(&mmc_host_class); | |
50 | } | |
51 | ||
52 | void mmc_unregister_host_class(void) | |
53 | { | |
54 | class_unregister(&mmc_host_class); | |
55 | } | |
56 | ||
57 | static DEFINE_IDR(mmc_host_idr); | |
58 | static DEFINE_SPINLOCK(mmc_host_lock); | |
59 | ||
04566831 | 60 | #ifdef CONFIG_MMC_CLKGATE |
597dd9d7 SRT |
61 | static ssize_t clkgate_delay_show(struct device *dev, |
62 | struct device_attribute *attr, char *buf) | |
63 | { | |
64 | struct mmc_host *host = cls_dev_to_mmc_host(dev); | |
4137e504 | 65 | return snprintf(buf, PAGE_SIZE, "%lu\n", host->clkgate_delay); |
597dd9d7 SRT |
66 | } |
67 | ||
68 | static ssize_t clkgate_delay_store(struct device *dev, | |
69 | struct device_attribute *attr, const char *buf, size_t count) | |
70 | { | |
71 | struct mmc_host *host = cls_dev_to_mmc_host(dev); | |
72 | unsigned long flags, value; | |
73 | ||
74 | if (kstrtoul(buf, 0, &value)) | |
75 | return -EINVAL; | |
76 | ||
77 | spin_lock_irqsave(&host->clk_lock, flags); | |
78 | host->clkgate_delay = value; | |
79 | spin_unlock_irqrestore(&host->clk_lock, flags); | |
597dd9d7 SRT |
80 | return count; |
81 | } | |
04566831 LW |
82 | |
83 | /* | |
84 | * Enabling clock gating will make the core call out to the host | |
85 | * once up and once down when it performs a request or card operation | |
86 | * intermingled in any fashion. The driver will see this through | |
87 | * set_ios() operations with ios.clock field set to 0 to gate (disable) | |
88 | * the block clock, and to the old frequency to enable it again. | |
89 | */ | |
90 | static void mmc_host_clk_gate_delayed(struct mmc_host *host) | |
91 | { | |
92 | unsigned long tick_ns; | |
93 | unsigned long freq = host->ios.clock; | |
94 | unsigned long flags; | |
95 | ||
96 | if (!freq) { | |
97 | pr_debug("%s: frequency set to 0 in disable function, " | |
98 | "this means the clock is already disabled.\n", | |
99 | mmc_hostname(host)); | |
100 | return; | |
101 | } | |
102 | /* | |
103 | * New requests may have appeared while we were scheduling, | |
104 | * then there is no reason to delay the check before | |
105 | * clk_disable(). | |
106 | */ | |
107 | spin_lock_irqsave(&host->clk_lock, flags); | |
108 | ||
109 | /* | |
110 | * Delay n bus cycles (at least 8 from MMC spec) before attempting | |
111 | * to disable the MCI block clock. The reference count may have | |
112 | * gone up again after this delay due to rescheduling! | |
113 | */ | |
114 | if (!host->clk_requests) { | |
115 | spin_unlock_irqrestore(&host->clk_lock, flags); | |
116 | tick_ns = DIV_ROUND_UP(1000000000, freq); | |
117 | ndelay(host->clk_delay * tick_ns); | |
118 | } else { | |
119 | /* New users appeared while waiting for this work */ | |
120 | spin_unlock_irqrestore(&host->clk_lock, flags); | |
121 | return; | |
122 | } | |
86f315bb | 123 | mutex_lock(&host->clk_gate_mutex); |
04566831 LW |
124 | spin_lock_irqsave(&host->clk_lock, flags); |
125 | if (!host->clk_requests) { | |
126 | spin_unlock_irqrestore(&host->clk_lock, flags); | |
127 | /* This will set host->ios.clock to 0 */ | |
128 | mmc_gate_clock(host); | |
129 | spin_lock_irqsave(&host->clk_lock, flags); | |
130 | pr_debug("%s: gated MCI clock\n", mmc_hostname(host)); | |
131 | } | |
132 | spin_unlock_irqrestore(&host->clk_lock, flags); | |
86f315bb | 133 | mutex_unlock(&host->clk_gate_mutex); |
04566831 LW |
134 | } |
135 | ||
136 | /* | |
137 | * Internal work. Work to disable the clock at some later point. | |
138 | */ | |
139 | static void mmc_host_clk_gate_work(struct work_struct *work) | |
140 | { | |
141 | struct mmc_host *host = container_of(work, struct mmc_host, | |
597dd9d7 | 142 | clk_gate_work.work); |
04566831 LW |
143 | |
144 | mmc_host_clk_gate_delayed(host); | |
145 | } | |
146 | ||
147 | /** | |
08c14071 | 148 | * mmc_host_clk_hold - ungate hardware MCI clocks |
04566831 LW |
149 | * @host: host to ungate. |
150 | * | |
151 | * Makes sure the host ios.clock is restored to a non-zero value | |
152 | * past this call. Increase clock reference count and ungate clock | |
153 | * if we're the first user. | |
154 | */ | |
08c14071 | 155 | void mmc_host_clk_hold(struct mmc_host *host) |
04566831 LW |
156 | { |
157 | unsigned long flags; | |
158 | ||
597dd9d7 SRT |
159 | /* cancel any clock gating work scheduled by mmc_host_clk_release() */ |
160 | cancel_delayed_work_sync(&host->clk_gate_work); | |
86f315bb | 161 | mutex_lock(&host->clk_gate_mutex); |
04566831 LW |
162 | spin_lock_irqsave(&host->clk_lock, flags); |
163 | if (host->clk_gated) { | |
164 | spin_unlock_irqrestore(&host->clk_lock, flags); | |
165 | mmc_ungate_clock(host); | |
166 | spin_lock_irqsave(&host->clk_lock, flags); | |
167 | pr_debug("%s: ungated MCI clock\n", mmc_hostname(host)); | |
168 | } | |
169 | host->clk_requests++; | |
170 | spin_unlock_irqrestore(&host->clk_lock, flags); | |
86f315bb | 171 | mutex_unlock(&host->clk_gate_mutex); |
04566831 LW |
172 | } |
173 | ||
174 | /** | |
175 | * mmc_host_may_gate_card - check if this card may be gated | |
176 | * @card: card to check. | |
177 | */ | |
178 | static bool mmc_host_may_gate_card(struct mmc_card *card) | |
179 | { | |
180 | /* If there is no card we may gate it */ | |
181 | if (!card) | |
182 | return true; | |
183 | /* | |
184 | * Don't gate SDIO cards! These need to be clocked at all times | |
185 | * since they may be independent systems generating interrupts | |
186 | * and other events. The clock requests counter from the core will | |
187 | * go down to zero since the core does not need it, but we will not | |
188 | * gate the clock, because there is somebody out there that may still | |
189 | * be using it. | |
190 | */ | |
db993500 | 191 | return !(card->quirks & MMC_QUIRK_BROKEN_CLK_GATING); |
04566831 LW |
192 | } |
193 | ||
194 | /** | |
08c14071 | 195 | * mmc_host_clk_release - gate off hardware MCI clocks |
04566831 LW |
196 | * @host: host to gate. |
197 | * | |
198 | * Calls the host driver with ios.clock set to zero as often as possible | |
199 | * in order to gate off hardware MCI clocks. Decrease clock reference | |
200 | * count and schedule disabling of clock. | |
201 | */ | |
08c14071 | 202 | void mmc_host_clk_release(struct mmc_host *host) |
04566831 LW |
203 | { |
204 | unsigned long flags; | |
205 | ||
206 | spin_lock_irqsave(&host->clk_lock, flags); | |
207 | host->clk_requests--; | |
208 | if (mmc_host_may_gate_card(host->card) && | |
209 | !host->clk_requests) | |
3b07e9ca TH |
210 | schedule_delayed_work(&host->clk_gate_work, |
211 | msecs_to_jiffies(host->clkgate_delay)); | |
04566831 LW |
212 | spin_unlock_irqrestore(&host->clk_lock, flags); |
213 | } | |
214 | ||
215 | /** | |
216 | * mmc_host_clk_rate - get current clock frequency setting | |
217 | * @host: host to get the clock frequency for. | |
218 | * | |
219 | * Returns current clock frequency regardless of gating. | |
220 | */ | |
221 | unsigned int mmc_host_clk_rate(struct mmc_host *host) | |
222 | { | |
223 | unsigned long freq; | |
224 | unsigned long flags; | |
225 | ||
226 | spin_lock_irqsave(&host->clk_lock, flags); | |
227 | if (host->clk_gated) | |
228 | freq = host->clk_old; | |
229 | else | |
230 | freq = host->ios.clock; | |
231 | spin_unlock_irqrestore(&host->clk_lock, flags); | |
232 | return freq; | |
233 | } | |
234 | ||
235 | /** | |
236 | * mmc_host_clk_init - set up clock gating code | |
237 | * @host: host with potential clock to control | |
238 | */ | |
239 | static inline void mmc_host_clk_init(struct mmc_host *host) | |
240 | { | |
241 | host->clk_requests = 0; | |
242 | /* Hold MCI clock for 8 cycles by default */ | |
243 | host->clk_delay = 8; | |
597dd9d7 | 244 | /* |
c84f15ae | 245 | * Default clock gating delay is 0ms to avoid wasting power. |
597dd9d7 SRT |
246 | * This value can be tuned by writing into sysfs entry. |
247 | */ | |
c84f15ae | 248 | host->clkgate_delay = 0; |
04566831 | 249 | host->clk_gated = false; |
597dd9d7 | 250 | INIT_DELAYED_WORK(&host->clk_gate_work, mmc_host_clk_gate_work); |
04566831 | 251 | spin_lock_init(&host->clk_lock); |
86f315bb | 252 | mutex_init(&host->clk_gate_mutex); |
04566831 LW |
253 | } |
254 | ||
255 | /** | |
256 | * mmc_host_clk_exit - shut down clock gating code | |
257 | * @host: host with potential clock to control | |
258 | */ | |
259 | static inline void mmc_host_clk_exit(struct mmc_host *host) | |
260 | { | |
261 | /* | |
262 | * Wait for any outstanding gate and then make sure we're | |
263 | * ungated before exiting. | |
264 | */ | |
597dd9d7 | 265 | if (cancel_delayed_work_sync(&host->clk_gate_work)) |
04566831 LW |
266 | mmc_host_clk_gate_delayed(host); |
267 | if (host->clk_gated) | |
08c14071 | 268 | mmc_host_clk_hold(host); |
c288b855 LW |
269 | /* There should be only one user now */ |
270 | WARN_ON(host->clk_requests > 1); | |
04566831 LW |
271 | } |
272 | ||
597dd9d7 SRT |
273 | static inline void mmc_host_clk_sysfs_init(struct mmc_host *host) |
274 | { | |
275 | host->clkgate_delay_attr.show = clkgate_delay_show; | |
276 | host->clkgate_delay_attr.store = clkgate_delay_store; | |
277 | sysfs_attr_init(&host->clkgate_delay_attr.attr); | |
278 | host->clkgate_delay_attr.attr.name = "clkgate_delay"; | |
279 | host->clkgate_delay_attr.attr.mode = S_IRUGO | S_IWUSR; | |
280 | if (device_create_file(&host->class_dev, &host->clkgate_delay_attr)) | |
281 | pr_err("%s: Failed to create clkgate_delay sysfs entry\n", | |
282 | mmc_hostname(host)); | |
283 | } | |
04566831 LW |
284 | #else |
285 | ||
286 | static inline void mmc_host_clk_init(struct mmc_host *host) | |
287 | { | |
288 | } | |
289 | ||
290 | static inline void mmc_host_clk_exit(struct mmc_host *host) | |
291 | { | |
292 | } | |
293 | ||
597dd9d7 SRT |
294 | static inline void mmc_host_clk_sysfs_init(struct mmc_host *host) |
295 | { | |
296 | } | |
297 | ||
04566831 LW |
298 | #endif |
299 | ||
6c56e7a0 GL |
300 | /** |
301 | * mmc_of_parse() - parse host's device-tree node | |
302 | * @host: host whose node should be parsed. | |
303 | * | |
304 | * To keep the rest of the MMC subsystem unaware of whether DT has been | |
305 | * used to to instantiate and configure this host instance or not, we | |
306 | * parse the properties and set respective generic mmc-host flags and | |
307 | * parameters. | |
308 | */ | |
ec0a7517 | 309 | int mmc_of_parse(struct mmc_host *host) |
6c56e7a0 GL |
310 | { |
311 | struct device_node *np; | |
312 | u32 bus_width; | |
313 | bool explicit_inv_wp, gpio_inv_wp = false; | |
314 | enum of_gpio_flags flags; | |
315 | int len, ret, gpio; | |
316 | ||
317 | if (!host->parent || !host->parent->of_node) | |
ec0a7517 | 318 | return 0; |
6c56e7a0 GL |
319 | |
320 | np = host->parent->of_node; | |
321 | ||
322 | /* "bus-width" is translated to MMC_CAP_*_BIT_DATA flags */ | |
323 | if (of_property_read_u32(np, "bus-width", &bus_width) < 0) { | |
324 | dev_dbg(host->parent, | |
325 | "\"bus-width\" property is missing, assuming 1 bit.\n"); | |
326 | bus_width = 1; | |
327 | } | |
328 | ||
329 | switch (bus_width) { | |
330 | case 8: | |
331 | host->caps |= MMC_CAP_8_BIT_DATA; | |
332 | /* Hosts capable of 8-bit transfers can also do 4 bits */ | |
333 | case 4: | |
334 | host->caps |= MMC_CAP_4_BIT_DATA; | |
335 | break; | |
336 | case 1: | |
337 | break; | |
338 | default: | |
339 | dev_err(host->parent, | |
1c279f4f | 340 | "Invalid \"bus-width\" value %u!\n", bus_width); |
ec0a7517 | 341 | return -EINVAL; |
6c56e7a0 GL |
342 | } |
343 | ||
344 | /* f_max is obtained from the optional "max-frequency" property */ | |
345 | of_property_read_u32(np, "max-frequency", &host->f_max); | |
346 | ||
347 | /* | |
348 | * Configure CD and WP pins. They are both by default active low to | |
349 | * match the SDHCI spec. If GPIOs are provided for CD and / or WP, the | |
350 | * mmc-gpio helpers are used to attach, configure and use them. If | |
351 | * polarity inversion is specified in DT, one of MMC_CAP2_CD_ACTIVE_HIGH | |
352 | * and MMC_CAP2_RO_ACTIVE_HIGH capability-2 flags is set. If the | |
353 | * "broken-cd" property is provided, the MMC_CAP_NEEDS_POLL capability | |
354 | * is set. If the "non-removable" property is found, the | |
355 | * MMC_CAP_NONREMOVABLE capability is set and no card-detection | |
356 | * configuration is performed. | |
357 | */ | |
358 | ||
359 | /* Parse Card Detection */ | |
360 | if (of_find_property(np, "non-removable", &len)) { | |
361 | host->caps |= MMC_CAP_NONREMOVABLE; | |
362 | } else { | |
363 | bool explicit_inv_cd, gpio_inv_cd = false; | |
364 | ||
365 | explicit_inv_cd = of_property_read_bool(np, "cd-inverted"); | |
366 | ||
367 | if (of_find_property(np, "broken-cd", &len)) | |
368 | host->caps |= MMC_CAP_NEEDS_POLL; | |
369 | ||
370 | gpio = of_get_named_gpio_flags(np, "cd-gpios", 0, &flags); | |
ec0a7517 SB |
371 | if (gpio == -EPROBE_DEFER) |
372 | return gpio; | |
6c56e7a0 GL |
373 | if (gpio_is_valid(gpio)) { |
374 | if (!(flags & OF_GPIO_ACTIVE_LOW)) | |
375 | gpio_inv_cd = true; | |
376 | ||
214fc309 | 377 | ret = mmc_gpio_request_cd(host, gpio, 0); |
ec0a7517 | 378 | if (ret < 0) { |
6c56e7a0 GL |
379 | dev_err(host->parent, |
380 | "Failed to request CD GPIO #%d: %d!\n", | |
381 | gpio, ret); | |
ec0a7517 SB |
382 | return ret; |
383 | } else { | |
6c56e7a0 GL |
384 | dev_info(host->parent, "Got CD GPIO #%d.\n", |
385 | gpio); | |
ec0a7517 | 386 | } |
6c56e7a0 GL |
387 | } |
388 | ||
389 | if (explicit_inv_cd ^ gpio_inv_cd) | |
390 | host->caps2 |= MMC_CAP2_CD_ACTIVE_HIGH; | |
391 | } | |
392 | ||
393 | /* Parse Write Protection */ | |
394 | explicit_inv_wp = of_property_read_bool(np, "wp-inverted"); | |
395 | ||
396 | gpio = of_get_named_gpio_flags(np, "wp-gpios", 0, &flags); | |
ec0a7517 SB |
397 | if (gpio == -EPROBE_DEFER) { |
398 | ret = -EPROBE_DEFER; | |
399 | goto out; | |
400 | } | |
6c56e7a0 GL |
401 | if (gpio_is_valid(gpio)) { |
402 | if (!(flags & OF_GPIO_ACTIVE_LOW)) | |
403 | gpio_inv_wp = true; | |
404 | ||
405 | ret = mmc_gpio_request_ro(host, gpio); | |
ec0a7517 | 406 | if (ret < 0) { |
6c56e7a0 GL |
407 | dev_err(host->parent, |
408 | "Failed to request WP GPIO: %d!\n", ret); | |
ec0a7517 SB |
409 | goto out; |
410 | } else { | |
411 | dev_info(host->parent, "Got WP GPIO #%d.\n", | |
412 | gpio); | |
413 | } | |
6c56e7a0 GL |
414 | } |
415 | if (explicit_inv_wp ^ gpio_inv_wp) | |
416 | host->caps2 |= MMC_CAP2_RO_ACTIVE_HIGH; | |
2fdb6e2d GL |
417 | |
418 | if (of_find_property(np, "cap-sd-highspeed", &len)) | |
419 | host->caps |= MMC_CAP_SD_HIGHSPEED; | |
420 | if (of_find_property(np, "cap-mmc-highspeed", &len)) | |
421 | host->caps |= MMC_CAP_MMC_HIGHSPEED; | |
b66bd0e4 UH |
422 | if (of_find_property(np, "sd-uhs-sdr12", &len)) |
423 | host->caps |= MMC_CAP_UHS_SDR12; | |
424 | if (of_find_property(np, "sd-uhs-sdr25", &len)) | |
425 | host->caps |= MMC_CAP_UHS_SDR25; | |
426 | if (of_find_property(np, "sd-uhs-sdr50", &len)) | |
427 | host->caps |= MMC_CAP_UHS_SDR50; | |
428 | if (of_find_property(np, "sd-uhs-sdr104", &len)) | |
429 | host->caps |= MMC_CAP_UHS_SDR104; | |
430 | if (of_find_property(np, "sd-uhs-ddr50", &len)) | |
431 | host->caps |= MMC_CAP_UHS_DDR50; | |
2fdb6e2d GL |
432 | if (of_find_property(np, "cap-power-off-card", &len)) |
433 | host->caps |= MMC_CAP_POWER_OFF_CARD; | |
434 | if (of_find_property(np, "cap-sdio-irq", &len)) | |
435 | host->caps |= MMC_CAP_SDIO_IRQ; | |
5a36d6bc UH |
436 | if (of_find_property(np, "full-pwr-cycle", &len)) |
437 | host->caps2 |= MMC_CAP2_FULL_PWR_CYCLE; | |
2fdb6e2d GL |
438 | if (of_find_property(np, "keep-power-in-suspend", &len)) |
439 | host->pm_caps |= MMC_PM_KEEP_POWER; | |
440 | if (of_find_property(np, "enable-sdio-wakeup", &len)) | |
441 | host->pm_caps |= MMC_PM_WAKE_SDIO_IRQ; | |
c0baf848 UH |
442 | if (of_find_property(np, "mmc-ddr-1_8v", &len)) |
443 | host->caps |= MMC_CAP_1_8V_DDR; | |
444 | if (of_find_property(np, "mmc-ddr-1_2v", &len)) | |
445 | host->caps |= MMC_CAP_1_2V_DDR; | |
321bd41d JC |
446 | if (of_find_property(np, "mmc-hs200-1_8v", &len)) |
447 | host->caps2 |= MMC_CAP2_HS200_1_8V_SDR; | |
448 | if (of_find_property(np, "mmc-hs200-1_2v", &len)) | |
449 | host->caps2 |= MMC_CAP2_HS200_1_2V_SDR; | |
c373eb48 SJ |
450 | if (of_find_property(np, "mmc-hs400-1_8v", &len)) |
451 | host->caps2 |= MMC_CAP2_HS400_1_8V | MMC_CAP2_HS200_1_8V_SDR; | |
452 | if (of_find_property(np, "mmc-hs400-1_2v", &len)) | |
453 | host->caps2 |= MMC_CAP2_HS400_1_2V | MMC_CAP2_HS200_1_2V_SDR; | |
ec0a7517 SB |
454 | |
455 | return 0; | |
456 | ||
457 | out: | |
458 | mmc_gpio_free_cd(host); | |
459 | return ret; | |
6c56e7a0 GL |
460 | } |
461 | ||
462 | EXPORT_SYMBOL(mmc_of_parse); | |
463 | ||
b93931a6 PO |
464 | /** |
465 | * mmc_alloc_host - initialise the per-host structure. | |
466 | * @extra: sizeof private data structure | |
467 | * @dev: pointer to host device model structure | |
468 | * | |
469 | * Initialise the per-host structure. | |
470 | */ | |
471 | struct mmc_host *mmc_alloc_host(int extra, struct device *dev) | |
472 | { | |
ff3112f5 | 473 | int err; |
b93931a6 PO |
474 | struct mmc_host *host; |
475 | ||
be760a9d | 476 | host = kzalloc(sizeof(struct mmc_host) + extra, GFP_KERNEL); |
b93931a6 PO |
477 | if (!host) |
478 | return NULL; | |
479 | ||
d9adcc12 GL |
480 | /* scanning will be enabled when we're ready */ |
481 | host->rescan_disable = 1; | |
803d9e04 | 482 | idr_preload(GFP_KERNEL); |
ff3112f5 | 483 | spin_lock(&mmc_host_lock); |
803d9e04 TH |
484 | err = idr_alloc(&mmc_host_idr, host, 0, 0, GFP_NOWAIT); |
485 | if (err >= 0) | |
486 | host->index = err; | |
ff3112f5 | 487 | spin_unlock(&mmc_host_lock); |
803d9e04 TH |
488 | idr_preload_end(); |
489 | if (err < 0) | |
ff3112f5 PO |
490 | goto free; |
491 | ||
d1b26863 | 492 | dev_set_name(&host->class_dev, "mmc%d", host->index); |
ff3112f5 | 493 | |
b93931a6 PO |
494 | host->parent = dev; |
495 | host->class_dev.parent = dev; | |
496 | host->class_dev.class = &mmc_host_class; | |
497 | device_initialize(&host->class_dev); | |
498 | ||
04566831 LW |
499 | mmc_host_clk_init(host); |
500 | ||
a7d1a1eb | 501 | mutex_init(&host->slot.lock); |
27410ee7 GL |
502 | host->slot.cd_irq = -EINVAL; |
503 | ||
b93931a6 PO |
504 | spin_lock_init(&host->lock); |
505 | init_waitqueue_head(&host->wq); | |
506 | INIT_DELAYED_WORK(&host->detect, mmc_rescan); | |
81ca03a0 | 507 | #ifdef CONFIG_PM |
4c2ef25f | 508 | host->pm_notify.notifier_call = mmc_pm_notify; |
81ca03a0 | 509 | #endif |
b93931a6 PO |
510 | |
511 | /* | |
512 | * By default, hosts do not support SGIO or large requests. | |
513 | * They have to set these according to their abilities. | |
514 | */ | |
a36274e0 | 515 | host->max_segs = 1; |
b93931a6 PO |
516 | host->max_seg_size = PAGE_CACHE_SIZE; |
517 | ||
518 | host->max_req_size = PAGE_CACHE_SIZE; | |
519 | host->max_blk_size = 512; | |
520 | host->max_blk_count = PAGE_CACHE_SIZE / 512; | |
521 | ||
522 | return host; | |
ff3112f5 PO |
523 | |
524 | free: | |
525 | kfree(host); | |
526 | return NULL; | |
b93931a6 PO |
527 | } |
528 | ||
529 | EXPORT_SYMBOL(mmc_alloc_host); | |
530 | ||
531 | /** | |
532 | * mmc_add_host - initialise host hardware | |
533 | * @host: mmc host | |
67a61c48 PO |
534 | * |
535 | * Register the host with the driver model. The host must be | |
536 | * prepared to start servicing requests before this function | |
537 | * completes. | |
b93931a6 PO |
538 | */ |
539 | int mmc_add_host(struct mmc_host *host) | |
540 | { | |
541 | int err; | |
542 | ||
17b759af NP |
543 | WARN_ON((host->caps & MMC_CAP_SDIO_IRQ) && |
544 | !host->ops->enable_sdio_irq); | |
545 | ||
b93931a6 PO |
546 | err = device_add(&host->class_dev); |
547 | if (err) | |
548 | return err; | |
549 | ||
f317dfeb WS |
550 | led_trigger_register_simple(dev_name(&host->class_dev), &host->led); |
551 | ||
6edd8ee6 HS |
552 | #ifdef CONFIG_DEBUG_FS |
553 | mmc_add_host_debugfs(host); | |
554 | #endif | |
597dd9d7 | 555 | mmc_host_clk_sysfs_init(host); |
6edd8ee6 | 556 | |
b93931a6 | 557 | mmc_start_host(host); |
4c2ef25f | 558 | register_pm_notifier(&host->pm_notify); |
b93931a6 PO |
559 | |
560 | return 0; | |
561 | } | |
562 | ||
563 | EXPORT_SYMBOL(mmc_add_host); | |
564 | ||
565 | /** | |
566 | * mmc_remove_host - remove host hardware | |
567 | * @host: mmc host | |
568 | * | |
569 | * Unregister and remove all cards associated with this host, | |
67a61c48 PO |
570 | * and power down the MMC bus. No new requests will be issued |
571 | * after this function has returned. | |
b93931a6 PO |
572 | */ |
573 | void mmc_remove_host(struct mmc_host *host) | |
574 | { | |
4c2ef25f | 575 | unregister_pm_notifier(&host->pm_notify); |
b93931a6 PO |
576 | mmc_stop_host(host); |
577 | ||
6edd8ee6 HS |
578 | #ifdef CONFIG_DEBUG_FS |
579 | mmc_remove_host_debugfs(host); | |
580 | #endif | |
581 | ||
b93931a6 PO |
582 | device_del(&host->class_dev); |
583 | ||
77f1fd6e | 584 | led_trigger_unregister_simple(host->led); |
04566831 LW |
585 | |
586 | mmc_host_clk_exit(host); | |
b93931a6 PO |
587 | } |
588 | ||
589 | EXPORT_SYMBOL(mmc_remove_host); | |
590 | ||
591 | /** | |
592 | * mmc_free_host - free the host structure | |
593 | * @host: mmc host | |
594 | * | |
595 | * Free the host once all references to it have been dropped. | |
596 | */ | |
597 | void mmc_free_host(struct mmc_host *host) | |
598 | { | |
ff3112f5 PO |
599 | spin_lock(&mmc_host_lock); |
600 | idr_remove(&mmc_host_idr, host->index); | |
601 | spin_unlock(&mmc_host_lock); | |
602 | ||
b93931a6 PO |
603 | put_device(&host->class_dev); |
604 | } | |
605 | ||
606 | EXPORT_SYMBOL(mmc_free_host); |