1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * linux/drivers/mmc/core/host.c
4 *
5 * Copyright (C) 2003 Russell King, All Rights Reserved.
6 * Copyright (C) 2007-2008 Pierre Ossman
7 * Copyright (C) 2010 Linus Walleij
8 *
9 * MMC host class device management
10 */
11
12 #include <linux/device.h>
13 #include <linux/err.h>
14 #include <linux/idr.h>
15 #include <linux/of.h>
16 #include <linux/of_gpio.h>
17 #include <linux/pagemap.h>
18 #include <linux/pm_wakeup.h>
19 #include <linux/export.h>
20 #include <linux/leds.h>
21 #include <linux/slab.h>
22
23 #include <linux/mmc/host.h>
24 #include <linux/mmc/card.h>
25 #include <linux/mmc/slot-gpio.h>
26
27 #include "core.h"
28 #include "crypto.h"
29 #include "host.h"
30 #include "slot-gpio.h"
31 #include "pwrseq.h"
32 #include "sdio_ops.h"
33
34 #define cls_dev_to_mmc_host(d) container_of(d, struct mmc_host, class_dev)
35
36 static DEFINE_IDA(mmc_host_ida);
37
38 #ifdef CONFIG_PM_SLEEP
mmc_host_class_prepare(struct device * dev)39 static int mmc_host_class_prepare(struct device *dev)
40 {
41 struct mmc_host *host = cls_dev_to_mmc_host(dev);
42
43 /*
44 * It's safe to access the bus_ops pointer, as both userspace and the
45 * workqueue for detecting cards are frozen at this point.
46 */
47 if (!host->bus_ops)
48 return 0;
49
50 /* Validate conditions for system suspend. */
51 if (host->bus_ops->pre_suspend)
52 return host->bus_ops->pre_suspend(host);
53
54 return 0;
55 }
56
mmc_host_class_complete(struct device * dev)57 static void mmc_host_class_complete(struct device *dev)
58 {
59 struct mmc_host *host = cls_dev_to_mmc_host(dev);
60
61 _mmc_detect_change(host, 0, false);
62 }
63
64 static const struct dev_pm_ops mmc_host_class_dev_pm_ops = {
65 .prepare = mmc_host_class_prepare,
66 .complete = mmc_host_class_complete,
67 };
68
69 #define MMC_HOST_CLASS_DEV_PM_OPS (&mmc_host_class_dev_pm_ops)
70 #else
71 #define MMC_HOST_CLASS_DEV_PM_OPS NULL
72 #endif
73
mmc_host_classdev_release(struct device * dev)74 static void mmc_host_classdev_release(struct device *dev)
75 {
76 struct mmc_host *host = cls_dev_to_mmc_host(dev);
77 wakeup_source_unregister(host->ws);
78 if (of_alias_get_id(host->parent->of_node, "mmc") < 0)
79 ida_simple_remove(&mmc_host_ida, host->index);
80 kfree(host);
81 }
82
mmc_host_classdev_shutdown(struct device * dev)83 static int mmc_host_classdev_shutdown(struct device *dev)
84 {
85 struct mmc_host *host = cls_dev_to_mmc_host(dev);
86
87 __mmc_stop_host(host);
88 return 0;
89 }
90
91 static struct class mmc_host_class = {
92 .name = "mmc_host",
93 .dev_release = mmc_host_classdev_release,
94 .shutdown_pre = mmc_host_classdev_shutdown,
95 .pm = MMC_HOST_CLASS_DEV_PM_OPS,
96 };
97
mmc_register_host_class(void)98 int mmc_register_host_class(void)
99 {
100 return class_register(&mmc_host_class);
101 }
102
mmc_unregister_host_class(void)103 void mmc_unregister_host_class(void)
104 {
105 class_unregister(&mmc_host_class);
106 }
107
108 /**
109 * mmc_retune_enable() - enter a transfer mode that requires retuning
110 * @host: host which should retune now
111 */
mmc_retune_enable(struct mmc_host * host)112 void mmc_retune_enable(struct mmc_host *host)
113 {
114 host->can_retune = 1;
115 if (host->retune_period)
116 mod_timer(&host->retune_timer,
117 jiffies + host->retune_period * HZ);
118 }
119
120 /*
121 * Pause re-tuning for a small set of operations. The pause begins after the
122 * next command and after first doing re-tuning.
123 */
mmc_retune_pause(struct mmc_host * host)124 void mmc_retune_pause(struct mmc_host *host)
125 {
126 if (!host->retune_paused) {
127 host->retune_paused = 1;
128 mmc_retune_needed(host);
129 mmc_retune_hold(host);
130 }
131 }
132 EXPORT_SYMBOL(mmc_retune_pause);
133
mmc_retune_unpause(struct mmc_host * host)134 void mmc_retune_unpause(struct mmc_host *host)
135 {
136 if (host->retune_paused) {
137 host->retune_paused = 0;
138 mmc_retune_release(host);
139 }
140 }
141 EXPORT_SYMBOL(mmc_retune_unpause);
142
143 /**
144 * mmc_retune_disable() - exit a transfer mode that requires retuning
145 * @host: host which should not retune anymore
146 *
147 * It is not meant for temporarily preventing retuning!
148 */
mmc_retune_disable(struct mmc_host * host)149 void mmc_retune_disable(struct mmc_host *host)
150 {
151 mmc_retune_unpause(host);
152 host->can_retune = 0;
153 del_timer_sync(&host->retune_timer);
154 mmc_retune_clear(host);
155 }
156
mmc_retune_timer_stop(struct mmc_host * host)157 void mmc_retune_timer_stop(struct mmc_host *host)
158 {
159 del_timer_sync(&host->retune_timer);
160 }
161 EXPORT_SYMBOL(mmc_retune_timer_stop);
162
mmc_retune_hold(struct mmc_host * host)163 void mmc_retune_hold(struct mmc_host *host)
164 {
165 if (!host->hold_retune)
166 host->retune_now = 1;
167 host->hold_retune += 1;
168 }
169 EXPORT_SYMBOL(mmc_retune_hold);
170
mmc_retune_release(struct mmc_host * host)171 void mmc_retune_release(struct mmc_host *host)
172 {
173 if (host->hold_retune)
174 host->hold_retune -= 1;
175 else
176 WARN_ON(1);
177 }
178 EXPORT_SYMBOL(mmc_retune_release);
179
mmc_retune(struct mmc_host * host)180 int mmc_retune(struct mmc_host *host)
181 {
182 bool return_to_hs400 = false;
183 int err;
184
185 if (host->retune_now)
186 host->retune_now = 0;
187 else
188 return 0;
189
190 if (!host->need_retune || host->doing_retune || !host->card)
191 return 0;
192
193 host->need_retune = 0;
194
195 host->doing_retune = 1;
196
197 if (host->ios.timing == MMC_TIMING_MMC_HS400) {
198 err = mmc_hs400_to_hs200(host->card);
199 if (err)
200 goto out;
201
202 return_to_hs400 = true;
203 }
204
205 err = mmc_execute_tuning(host->card);
206 if (err)
207 goto out;
208
209 if (return_to_hs400)
210 err = mmc_hs200_to_hs400(host->card);
211 out:
212 host->doing_retune = 0;
213
214 return err;
215 }
216
mmc_retune_timer(struct timer_list * t)217 static void mmc_retune_timer(struct timer_list *t)
218 {
219 struct mmc_host *host = from_timer(host, t, retune_timer);
220
221 mmc_retune_needed(host);
222 }
223
mmc_of_parse_timing_phase(struct device * dev,const char * prop,struct mmc_clk_phase * phase)224 static void mmc_of_parse_timing_phase(struct device *dev, const char *prop,
225 struct mmc_clk_phase *phase)
226 {
227 int degrees[2] = {0};
228 int rc;
229
230 rc = device_property_read_u32_array(dev, prop, degrees, 2);
231 phase->valid = !rc;
232 if (phase->valid) {
233 phase->in_deg = degrees[0];
234 phase->out_deg = degrees[1];
235 }
236 }
237
238 void
mmc_of_parse_clk_phase(struct mmc_host * host,struct mmc_clk_phase_map * map)239 mmc_of_parse_clk_phase(struct mmc_host *host, struct mmc_clk_phase_map *map)
240 {
241 struct device *dev = host->parent;
242
243 mmc_of_parse_timing_phase(dev, "clk-phase-legacy",
244 &map->phase[MMC_TIMING_LEGACY]);
245 mmc_of_parse_timing_phase(dev, "clk-phase-mmc-hs",
246 &map->phase[MMC_TIMING_MMC_HS]);
247 mmc_of_parse_timing_phase(dev, "clk-phase-sd-hs",
248 &map->phase[MMC_TIMING_SD_HS]);
249 mmc_of_parse_timing_phase(dev, "clk-phase-uhs-sdr12",
250 &map->phase[MMC_TIMING_UHS_SDR12]);
251 mmc_of_parse_timing_phase(dev, "clk-phase-uhs-sdr25",
252 &map->phase[MMC_TIMING_UHS_SDR25]);
253 mmc_of_parse_timing_phase(dev, "clk-phase-uhs-sdr50",
254 &map->phase[MMC_TIMING_UHS_SDR50]);
255 mmc_of_parse_timing_phase(dev, "clk-phase-uhs-sdr104",
256 &map->phase[MMC_TIMING_UHS_SDR104]);
257 mmc_of_parse_timing_phase(dev, "clk-phase-uhs-ddr50",
258 &map->phase[MMC_TIMING_UHS_DDR50]);
259 mmc_of_parse_timing_phase(dev, "clk-phase-mmc-ddr52",
260 &map->phase[MMC_TIMING_MMC_DDR52]);
261 mmc_of_parse_timing_phase(dev, "clk-phase-mmc-hs200",
262 &map->phase[MMC_TIMING_MMC_HS200]);
263 mmc_of_parse_timing_phase(dev, "clk-phase-mmc-hs400",
264 &map->phase[MMC_TIMING_MMC_HS400]);
265 }
266 EXPORT_SYMBOL(mmc_of_parse_clk_phase);
267
268 /**
269 * mmc_of_parse() - parse host's device properties
270 * @host: host whose properties should be parsed.
271 *
272 * To keep the rest of the MMC subsystem unaware of whether DT has been
273 * used to to instantiate and configure this host instance or not, we
274 * parse the properties and set respective generic mmc-host flags and
275 * parameters.
276 */
mmc_of_parse(struct mmc_host * host)277 int mmc_of_parse(struct mmc_host *host)
278 {
279 struct device *dev = host->parent;
280 u32 bus_width, drv_type, cd_debounce_delay_ms;
281 int ret;
282
283 if (!dev || !dev_fwnode(dev))
284 return 0;
285
286 /* "bus-width" is translated to MMC_CAP_*_BIT_DATA flags */
287 if (device_property_read_u32(dev, "bus-width", &bus_width) < 0) {
288 dev_dbg(host->parent,
289 "\"bus-width\" property is missing, assuming 1 bit.\n");
290 bus_width = 1;
291 }
292
293 switch (bus_width) {
294 case 8:
295 host->caps |= MMC_CAP_8_BIT_DATA;
296 fallthrough; /* Hosts capable of 8-bit can also do 4 bits */
297 case 4:
298 host->caps |= MMC_CAP_4_BIT_DATA;
299 break;
300 case 1:
301 break;
302 default:
303 dev_err(host->parent,
304 "Invalid \"bus-width\" value %u!\n", bus_width);
305 return -EINVAL;
306 }
307
308 /* f_max is obtained from the optional "max-frequency" property */
309 device_property_read_u32(dev, "max-frequency", &host->f_max);
310
311 /*
312 * Configure CD and WP pins. They are both by default active low to
313 * match the SDHCI spec. If GPIOs are provided for CD and / or WP, the
314 * mmc-gpio helpers are used to attach, configure and use them. If
315 * polarity inversion is specified in DT, one of MMC_CAP2_CD_ACTIVE_HIGH
316 * and MMC_CAP2_RO_ACTIVE_HIGH capability-2 flags is set. If the
317 * "broken-cd" property is provided, the MMC_CAP_NEEDS_POLL capability
318 * is set. If the "non-removable" property is found, the
319 * MMC_CAP_NONREMOVABLE capability is set and no card-detection
320 * configuration is performed.
321 */
322
323 /* Parse Card Detection */
324
325 if (device_property_read_bool(dev, "non-removable")) {
326 host->caps |= MMC_CAP_NONREMOVABLE;
327 } else {
328 if (device_property_read_bool(dev, "cd-inverted"))
329 host->caps2 |= MMC_CAP2_CD_ACTIVE_HIGH;
330
331 if (device_property_read_u32(dev, "cd-debounce-delay-ms",
332 &cd_debounce_delay_ms))
333 cd_debounce_delay_ms = 200;
334
335 if (device_property_read_bool(dev, "broken-cd"))
336 host->caps |= MMC_CAP_NEEDS_POLL;
337
338 ret = mmc_gpiod_request_cd(host, "cd", 0, false,
339 cd_debounce_delay_ms * 1000);
340 if (!ret)
341 dev_info(host->parent, "Got CD GPIO\n");
342 else if (ret != -ENOENT && ret != -ENOSYS)
343 return ret;
344 }
345
346 /* Parse Write Protection */
347
348 if (device_property_read_bool(dev, "wp-inverted"))
349 host->caps2 |= MMC_CAP2_RO_ACTIVE_HIGH;
350
351 ret = mmc_gpiod_request_ro(host, "wp", 0, 0);
352 if (!ret)
353 dev_info(host->parent, "Got WP GPIO\n");
354 else if (ret != -ENOENT && ret != -ENOSYS)
355 return ret;
356
357 if (device_property_read_bool(dev, "disable-wp"))
358 host->caps2 |= MMC_CAP2_NO_WRITE_PROTECT;
359
360 if (device_property_read_bool(dev, "cap-sd-highspeed"))
361 host->caps |= MMC_CAP_SD_HIGHSPEED;
362 if (device_property_read_bool(dev, "cap-mmc-highspeed"))
363 host->caps |= MMC_CAP_MMC_HIGHSPEED;
364 if (device_property_read_bool(dev, "sd-uhs-sdr12"))
365 host->caps |= MMC_CAP_UHS_SDR12;
366 if (device_property_read_bool(dev, "sd-uhs-sdr25"))
367 host->caps |= MMC_CAP_UHS_SDR25;
368 if (device_property_read_bool(dev, "sd-uhs-sdr50"))
369 host->caps |= MMC_CAP_UHS_SDR50;
370 if (device_property_read_bool(dev, "sd-uhs-sdr104"))
371 host->caps |= MMC_CAP_UHS_SDR104;
372 if (device_property_read_bool(dev, "sd-uhs-ddr50"))
373 host->caps |= MMC_CAP_UHS_DDR50;
374 if (device_property_read_bool(dev, "cap-power-off-card"))
375 host->caps |= MMC_CAP_POWER_OFF_CARD;
376 if (device_property_read_bool(dev, "cap-mmc-hw-reset"))
377 host->caps |= MMC_CAP_HW_RESET;
378 if (device_property_read_bool(dev, "cap-sdio-irq"))
379 host->caps |= MMC_CAP_SDIO_IRQ;
380 if (device_property_read_bool(dev, "full-pwr-cycle"))
381 host->caps2 |= MMC_CAP2_FULL_PWR_CYCLE;
382 if (device_property_read_bool(dev, "full-pwr-cycle-in-suspend"))
383 host->caps2 |= MMC_CAP2_FULL_PWR_CYCLE_IN_SUSPEND;
384 if (device_property_read_bool(dev, "keep-power-in-suspend"))
385 host->pm_caps |= MMC_PM_KEEP_POWER;
386 if (device_property_read_bool(dev, "wakeup-source") ||
387 device_property_read_bool(dev, "enable-sdio-wakeup")) /* legacy */
388 host->pm_caps |= MMC_PM_WAKE_SDIO_IRQ;
389 if (device_property_read_bool(dev, "mmc-ddr-3_3v"))
390 host->caps |= MMC_CAP_3_3V_DDR;
391 if (device_property_read_bool(dev, "mmc-ddr-1_8v"))
392 host->caps |= MMC_CAP_1_8V_DDR;
393 if (device_property_read_bool(dev, "mmc-ddr-1_2v"))
394 host->caps |= MMC_CAP_1_2V_DDR;
395 if (device_property_read_bool(dev, "mmc-hs200-1_8v"))
396 host->caps2 |= MMC_CAP2_HS200_1_8V_SDR;
397 if (device_property_read_bool(dev, "mmc-hs200-1_2v"))
398 host->caps2 |= MMC_CAP2_HS200_1_2V_SDR;
399 if (device_property_read_bool(dev, "mmc-hs400-1_8v"))
400 host->caps2 |= MMC_CAP2_HS400_1_8V | MMC_CAP2_HS200_1_8V_SDR;
401 if (device_property_read_bool(dev, "mmc-hs400-1_2v"))
402 host->caps2 |= MMC_CAP2_HS400_1_2V | MMC_CAP2_HS200_1_2V_SDR;
403 if (device_property_read_bool(dev, "mmc-hs400-enhanced-strobe"))
404 host->caps2 |= MMC_CAP2_HS400_ES;
405 if (device_property_read_bool(dev, "no-sdio"))
406 host->caps2 |= MMC_CAP2_NO_SDIO;
407 if (device_property_read_bool(dev, "no-sd"))
408 host->caps2 |= MMC_CAP2_NO_SD;
409 if (device_property_read_bool(dev, "no-mmc"))
410 host->caps2 |= MMC_CAP2_NO_MMC;
411 if (device_property_read_bool(dev, "no-mmc-hs400"))
412 host->caps2 &= ~(MMC_CAP2_HS400_1_8V | MMC_CAP2_HS400_1_2V |
413 MMC_CAP2_HS400_ES);
414
415 /* Must be after "non-removable" check */
416 if (device_property_read_u32(dev, "fixed-emmc-driver-type", &drv_type) == 0) {
417 if (host->caps & MMC_CAP_NONREMOVABLE)
418 host->fixed_drv_type = drv_type;
419 else
420 dev_err(host->parent,
421 "can't use fixed driver type, media is removable\n");
422 }
423
424 host->dsr_req = !device_property_read_u32(dev, "dsr", &host->dsr);
425 if (host->dsr_req && (host->dsr & ~0xffff)) {
426 dev_err(host->parent,
427 "device tree specified broken value for DSR: 0x%x, ignoring\n",
428 host->dsr);
429 host->dsr_req = 0;
430 }
431
432 device_property_read_u32(dev, "post-power-on-delay-ms",
433 &host->ios.power_delay_ms);
434
435 return mmc_pwrseq_alloc(host);
436 }
437
438 EXPORT_SYMBOL(mmc_of_parse);
439
440 /**
441 * mmc_of_parse_voltage - return mask of supported voltages
442 * @host: host whose properties should be parsed.
443 * @mask: mask of voltages available for MMC/SD/SDIO
444 *
445 * Parse the "voltage-ranges" property, returning zero if it is not
446 * found, negative errno if the voltage-range specification is invalid,
447 * or one if the voltage-range is specified and successfully parsed.
448 */
mmc_of_parse_voltage(struct mmc_host * host,u32 * mask)449 int mmc_of_parse_voltage(struct mmc_host *host, u32 *mask)
450 {
451 const char *prop = "voltage-ranges";
452 struct device *dev = host->parent;
453 u32 *voltage_ranges;
454 int num_ranges, i;
455 int ret;
456
457 if (!device_property_present(dev, prop)) {
458 dev_dbg(dev, "%s unspecified\n", prop);
459 return 0;
460 }
461
462 ret = device_property_count_u32(dev, prop);
463 if (ret < 0)
464 return ret;
465
466 num_ranges = ret / 2;
467 if (!num_ranges) {
468 dev_err(dev, "%s empty\n", prop);
469 return -EINVAL;
470 }
471
472 voltage_ranges = kcalloc(2 * num_ranges, sizeof(*voltage_ranges), GFP_KERNEL);
473 if (!voltage_ranges)
474 return -ENOMEM;
475
476 ret = device_property_read_u32_array(dev, prop, voltage_ranges, 2 * num_ranges);
477 if (ret) {
478 kfree(voltage_ranges);
479 return ret;
480 }
481
482 for (i = 0; i < num_ranges; i++) {
483 const int j = i * 2;
484 u32 ocr_mask;
485
486 ocr_mask = mmc_vddrange_to_ocrmask(voltage_ranges[j + 0],
487 voltage_ranges[j + 1]);
488 if (!ocr_mask) {
489 dev_err(dev, "range #%d in %s is invalid\n", i, prop);
490 kfree(voltage_ranges);
491 return -EINVAL;
492 }
493 *mask |= ocr_mask;
494 }
495
496 kfree(voltage_ranges);
497
498 return 1;
499 }
500 EXPORT_SYMBOL(mmc_of_parse_voltage);
501
502 /**
503 * mmc_first_nonreserved_index() - get the first index that is not reserved
504 */
mmc_first_nonreserved_index(void)505 static int mmc_first_nonreserved_index(void)
506 {
507 int max;
508
509 max = of_alias_get_highest_id("mmc");
510 if (max < 0)
511 return 0;
512
513 return max + 1;
514 }
515
516 /**
517 * mmc_alloc_host - initialise the per-host structure.
518 * @extra: sizeof private data structure
519 * @dev: pointer to host device model structure
520 *
521 * Initialise the per-host structure.
522 */
mmc_alloc_host(int extra,struct device * dev)523 struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
524 {
525 int index;
526 struct mmc_host *host;
527 int alias_id, min_idx, max_idx;
528
529 host = kzalloc(sizeof(struct mmc_host) + extra, GFP_KERNEL);
530 if (!host)
531 return NULL;
532
533 /* scanning will be enabled when we're ready */
534 host->rescan_disable = 1;
535
536 alias_id = of_alias_get_id(dev->of_node, "mmc");
537 if (alias_id >= 0) {
538 index = alias_id;
539 } else {
540 min_idx = mmc_first_nonreserved_index();
541 max_idx = 0;
542
543 index = ida_simple_get(&mmc_host_ida, min_idx, max_idx, GFP_KERNEL);
544 if (index < 0) {
545 kfree(host);
546 return NULL;
547 }
548 }
549
550 host->index = index;
551
552 dev_set_name(&host->class_dev, "mmc%d", host->index);
553 host->ws = wakeup_source_register(NULL, dev_name(&host->class_dev));
554
555 host->parent = dev;
556 host->class_dev.parent = dev;
557 host->class_dev.class = &mmc_host_class;
558 device_initialize(&host->class_dev);
559 device_enable_async_suspend(&host->class_dev);
560
561 if (mmc_gpio_alloc(host)) {
562 put_device(&host->class_dev);
563 return NULL;
564 }
565
566 spin_lock_init(&host->lock);
567 init_waitqueue_head(&host->wq);
568 INIT_DELAYED_WORK(&host->detect, mmc_rescan);
569 INIT_WORK(&host->sdio_irq_work, sdio_irq_work);
570 timer_setup(&host->retune_timer, mmc_retune_timer, 0);
571
572 /*
573 * By default, hosts do not support SGIO or large requests.
574 * They have to set these according to their abilities.
575 */
576 host->max_segs = 1;
577 host->max_seg_size = PAGE_SIZE;
578
579 host->max_req_size = PAGE_SIZE;
580 host->max_blk_size = 512;
581 host->max_blk_count = PAGE_SIZE / 512;
582
583 host->fixed_drv_type = -EINVAL;
584 host->ios.power_delay_ms = 10;
585 host->ios.power_mode = MMC_POWER_UNDEFINED;
586
587 return host;
588 }
589
590 EXPORT_SYMBOL(mmc_alloc_host);
591
mmc_validate_host_caps(struct mmc_host * host)592 static int mmc_validate_host_caps(struct mmc_host *host)
593 {
594 struct device *dev = host->parent;
595 u32 caps = host->caps, caps2 = host->caps2;
596
597 if (caps & MMC_CAP_SDIO_IRQ && !host->ops->enable_sdio_irq) {
598 dev_warn(dev, "missing ->enable_sdio_irq() ops\n");
599 return -EINVAL;
600 }
601
602 if (caps2 & (MMC_CAP2_HS400_ES | MMC_CAP2_HS400) &&
603 !(caps & MMC_CAP_8_BIT_DATA) && !(caps2 & MMC_CAP2_NO_MMC)) {
604 dev_warn(dev, "drop HS400 support since no 8-bit bus\n");
605 host->caps2 = caps2 & ~MMC_CAP2_HS400_ES & ~MMC_CAP2_HS400;
606 }
607
608 return 0;
609 }
610
611 /**
612 * mmc_add_host - initialise host hardware
613 * @host: mmc host
614 *
615 * Register the host with the driver model. The host must be
616 * prepared to start servicing requests before this function
617 * completes.
618 */
mmc_add_host(struct mmc_host * host)619 int mmc_add_host(struct mmc_host *host)
620 {
621 int err;
622
623 err = mmc_validate_host_caps(host);
624 if (err)
625 return err;
626
627 err = device_add(&host->class_dev);
628 if (err)
629 return err;
630
631 led_trigger_register_simple(dev_name(&host->class_dev), &host->led);
632
633 #ifdef CONFIG_DEBUG_FS
634 mmc_add_host_debugfs(host);
635 #endif
636
637 mmc_start_host(host);
638 return 0;
639 }
640
641 EXPORT_SYMBOL(mmc_add_host);
642
643 /**
644 * mmc_remove_host - remove host hardware
645 * @host: mmc host
646 *
647 * Unregister and remove all cards associated with this host,
648 * and power down the MMC bus. No new requests will be issued
649 * after this function has returned.
650 */
mmc_remove_host(struct mmc_host * host)651 void mmc_remove_host(struct mmc_host *host)
652 {
653 mmc_stop_host(host);
654
655 #ifdef CONFIG_DEBUG_FS
656 mmc_remove_host_debugfs(host);
657 #endif
658
659 device_del(&host->class_dev);
660
661 led_trigger_unregister_simple(host->led);
662 }
663
664 EXPORT_SYMBOL(mmc_remove_host);
665
666 /**
667 * mmc_free_host - free the host structure
668 * @host: mmc host
669 *
670 * Free the host once all references to it have been dropped.
671 */
mmc_free_host(struct mmc_host * host)672 void mmc_free_host(struct mmc_host *host)
673 {
674 cancel_delayed_work_sync(&host->detect);
675 mmc_pwrseq_free(host);
676 put_device(&host->class_dev);
677 }
678
679 EXPORT_SYMBOL(mmc_free_host);
680