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1/*
2 * linux/drivers/mmc/core/host.c
3 *
4 * Copyright (C) 2003 Russell King, All Rights Reserved.
5 * Copyright (C) 2007-2008 Pierre Ossman
6 * Copyright (C) 2010 Linus Walleij
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/of.h>
19#include <linux/of_gpio.h>
20#include <linux/pagemap.h>
21#include <linux/export.h>
22#include <linux/leds.h>
23#include <linux/slab.h>
24
25#include <linux/mmc/host.h>
26#include <linux/mmc/card.h>
27#include <linux/mmc/slot-gpio.h>
28
29#include "core.h"
30#include "host.h"
31#include "slot-gpio.h"
32#include "pwrseq.h"
33
34#define cls_dev_to_mmc_host(d) container_of(d, struct mmc_host, class_dev)
35
36static DEFINE_IDR(mmc_host_idr);
37static DEFINE_SPINLOCK(mmc_host_lock);
38
39static void mmc_host_classdev_release(struct device *dev)
40{
41 struct mmc_host *host = cls_dev_to_mmc_host(dev);
42 spin_lock(&mmc_host_lock);
43 idr_remove(&mmc_host_idr, host->index);
44 spin_unlock(&mmc_host_lock);
45 kfree(host);
46}
47
48static struct class mmc_host_class = {
49 .name = "mmc_host",
50 .dev_release = mmc_host_classdev_release,
51};
52
53int mmc_register_host_class(void)
54{
55 return class_register(&mmc_host_class);
56}
57
58void mmc_unregister_host_class(void)
59{
60 class_unregister(&mmc_host_class);
61}
62
63void mmc_retune_enable(struct mmc_host *host)
64{
65 host->can_retune = 1;
66 if (host->retune_period)
67 mod_timer(&host->retune_timer,
68 jiffies + host->retune_period * HZ);
69}
70
71void mmc_retune_disable(struct mmc_host *host)
72{
73 host->can_retune = 0;
74 del_timer_sync(&host->retune_timer);
75 host->retune_now = 0;
76 host->need_retune = 0;
77}
78
79void mmc_retune_timer_stop(struct mmc_host *host)
80{
81 del_timer_sync(&host->retune_timer);
82}
83EXPORT_SYMBOL(mmc_retune_timer_stop);
84
85void mmc_retune_hold(struct mmc_host *host)
86{
87 if (!host->hold_retune)
88 host->retune_now = 1;
89 host->hold_retune += 1;
90}
91
92void mmc_retune_release(struct mmc_host *host)
93{
94 if (host->hold_retune)
95 host->hold_retune -= 1;
96 else
97 WARN_ON(1);
98}
99
100int mmc_retune(struct mmc_host *host)
101{
102 bool return_to_hs400 = false;
103 int err;
104
105 if (host->retune_now)
106 host->retune_now = 0;
107 else
108 return 0;
109
110 if (!host->need_retune || host->doing_retune || !host->card)
111 return 0;
112
113 host->need_retune = 0;
114
115 host->doing_retune = 1;
116
117 if (host->ios.timing == MMC_TIMING_MMC_HS400) {
118 err = mmc_hs400_to_hs200(host->card);
119 if (err)
120 goto out;
121
122 return_to_hs400 = true;
123
124 if (host->ops->prepare_hs400_tuning)
125 host->ops->prepare_hs400_tuning(host, &host->ios);
126 }
127
128 err = mmc_execute_tuning(host->card);
129 if (err)
130 goto out;
131
132 if (return_to_hs400)
133 err = mmc_hs200_to_hs400(host->card);
134out:
135 host->doing_retune = 0;
136
137 return err;
138}
139
140static void mmc_retune_timer(unsigned long data)
141{
142 struct mmc_host *host = (struct mmc_host *)data;
143
144 mmc_retune_needed(host);
145}
146
147/**
148 * mmc_of_parse() - parse host's device-tree node
149 * @host: host whose node should be parsed.
150 *
151 * To keep the rest of the MMC subsystem unaware of whether DT has been
152 * used to to instantiate and configure this host instance or not, we
153 * parse the properties and set respective generic mmc-host flags and
154 * parameters.
155 */
156int mmc_of_parse(struct mmc_host *host)
157{
158 struct device_node *np;
159 u32 bus_width;
160 int ret;
161 bool cd_cap_invert, cd_gpio_invert = false;
162 bool ro_cap_invert, ro_gpio_invert = false;
163
164 if (!host->parent || !host->parent->of_node)
165 return 0;
166
167 np = host->parent->of_node;
168
169 /* "bus-width" is translated to MMC_CAP_*_BIT_DATA flags */
170 if (of_property_read_u32(np, "bus-width", &bus_width) < 0) {
171 dev_dbg(host->parent,
172 "\"bus-width\" property is missing, assuming 1 bit.\n");
173 bus_width = 1;
174 }
175
176 switch (bus_width) {
177 case 8:
178 host->caps |= MMC_CAP_8_BIT_DATA;
179 /* Hosts capable of 8-bit transfers can also do 4 bits */
180 case 4:
181 host->caps |= MMC_CAP_4_BIT_DATA;
182 break;
183 case 1:
184 break;
185 default:
186 dev_err(host->parent,
187 "Invalid \"bus-width\" value %u!\n", bus_width);
188 return -EINVAL;
189 }
190
191 /* f_max is obtained from the optional "max-frequency" property */
192 of_property_read_u32(np, "max-frequency", &host->f_max);
193
194 /*
195 * Configure CD and WP pins. They are both by default active low to
196 * match the SDHCI spec. If GPIOs are provided for CD and / or WP, the
197 * mmc-gpio helpers are used to attach, configure and use them. If
198 * polarity inversion is specified in DT, one of MMC_CAP2_CD_ACTIVE_HIGH
199 * and MMC_CAP2_RO_ACTIVE_HIGH capability-2 flags is set. If the
200 * "broken-cd" property is provided, the MMC_CAP_NEEDS_POLL capability
201 * is set. If the "non-removable" property is found, the
202 * MMC_CAP_NONREMOVABLE capability is set and no card-detection
203 * configuration is performed.
204 */
205
206 /* Parse Card Detection */
207 if (of_property_read_bool(np, "non-removable")) {
208 host->caps |= MMC_CAP_NONREMOVABLE;
209 } else {
210 cd_cap_invert = of_property_read_bool(np, "cd-inverted");
211
212 if (of_property_read_bool(np, "broken-cd"))
213 host->caps |= MMC_CAP_NEEDS_POLL;
214
215 ret = mmc_gpiod_request_cd(host, "cd", 0, true,
216 0, &cd_gpio_invert);
217 if (!ret)
218 dev_info(host->parent, "Got CD GPIO\n");
219 else if (ret != -ENOENT && ret != -ENOSYS)
220 return ret;
221
222 /*
223 * There are two ways to flag that the CD line is inverted:
224 * through the cd-inverted flag and by the GPIO line itself
225 * being inverted from the GPIO subsystem. This is a leftover
226 * from the times when the GPIO subsystem did not make it
227 * possible to flag a line as inverted.
228 *
229 * If the capability on the host AND the GPIO line are
230 * both inverted, the end result is that the CD line is
231 * not inverted.
232 */
233 if (cd_cap_invert ^ cd_gpio_invert)
234 host->caps2 |= MMC_CAP2_CD_ACTIVE_HIGH;
235 }
236
237 /* Parse Write Protection */
238 ro_cap_invert = of_property_read_bool(np, "wp-inverted");
239
240 ret = mmc_gpiod_request_ro(host, "wp", 0, false, 0, &ro_gpio_invert);
241 if (!ret)
242 dev_info(host->parent, "Got WP GPIO\n");
243 else if (ret != -ENOENT && ret != -ENOSYS)
244 return ret;
245
246 if (of_property_read_bool(np, "disable-wp"))
247 host->caps2 |= MMC_CAP2_NO_WRITE_PROTECT;
248
249 /* See the comment on CD inversion above */
250 if (ro_cap_invert ^ ro_gpio_invert)
251 host->caps2 |= MMC_CAP2_RO_ACTIVE_HIGH;
252
253 if (of_property_read_bool(np, "cap-sd-highspeed"))
254 host->caps |= MMC_CAP_SD_HIGHSPEED;
255 if (of_property_read_bool(np, "cap-mmc-highspeed"))
256 host->caps |= MMC_CAP_MMC_HIGHSPEED;
257 if (of_property_read_bool(np, "sd-uhs-sdr12"))
258 host->caps |= MMC_CAP_UHS_SDR12;
259 if (of_property_read_bool(np, "sd-uhs-sdr25"))
260 host->caps |= MMC_CAP_UHS_SDR25;
261 if (of_property_read_bool(np, "sd-uhs-sdr50"))
262 host->caps |= MMC_CAP_UHS_SDR50;
263 if (of_property_read_bool(np, "sd-uhs-sdr104"))
264 host->caps |= MMC_CAP_UHS_SDR104;
265 if (of_property_read_bool(np, "sd-uhs-ddr50"))
266 host->caps |= MMC_CAP_UHS_DDR50;
267 if (of_property_read_bool(np, "cap-power-off-card"))
268 host->caps |= MMC_CAP_POWER_OFF_CARD;
269 if (of_property_read_bool(np, "cap-mmc-hw-reset"))
270 host->caps |= MMC_CAP_HW_RESET;
271 if (of_property_read_bool(np, "cap-sdio-irq"))
272 host->caps |= MMC_CAP_SDIO_IRQ;
273 if (of_property_read_bool(np, "full-pwr-cycle"))
274 host->caps2 |= MMC_CAP2_FULL_PWR_CYCLE;
275 if (of_property_read_bool(np, "keep-power-in-suspend"))
276 host->pm_caps |= MMC_PM_KEEP_POWER;
277 if (of_property_read_bool(np, "wakeup-source") ||
278 of_property_read_bool(np, "enable-sdio-wakeup")) /* legacy */
279 host->pm_caps |= MMC_PM_WAKE_SDIO_IRQ;
280 if (of_property_read_bool(np, "mmc-ddr-1_8v"))
281 host->caps |= MMC_CAP_1_8V_DDR;
282 if (of_property_read_bool(np, "mmc-ddr-1_2v"))
283 host->caps |= MMC_CAP_1_2V_DDR;
284 if (of_property_read_bool(np, "mmc-hs200-1_8v"))
285 host->caps2 |= MMC_CAP2_HS200_1_8V_SDR;
286 if (of_property_read_bool(np, "mmc-hs200-1_2v"))
287 host->caps2 |= MMC_CAP2_HS200_1_2V_SDR;
288 if (of_property_read_bool(np, "mmc-hs400-1_8v"))
289 host->caps2 |= MMC_CAP2_HS400_1_8V | MMC_CAP2_HS200_1_8V_SDR;
290 if (of_property_read_bool(np, "mmc-hs400-1_2v"))
291 host->caps2 |= MMC_CAP2_HS400_1_2V | MMC_CAP2_HS200_1_2V_SDR;
292
293 host->dsr_req = !of_property_read_u32(np, "dsr", &host->dsr);
294 if (host->dsr_req && (host->dsr & ~0xffff)) {
295 dev_err(host->parent,
296 "device tree specified broken value for DSR: 0x%x, ignoring\n",
297 host->dsr);
298 host->dsr_req = 0;
299 }
300
301 return mmc_pwrseq_alloc(host);
302}
303
304EXPORT_SYMBOL(mmc_of_parse);
305
306/**
307 * mmc_alloc_host - initialise the per-host structure.
308 * @extra: sizeof private data structure
309 * @dev: pointer to host device model structure
310 *
311 * Initialise the per-host structure.
312 */
313struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
314{
315 int err;
316 struct mmc_host *host;
317
318 host = kzalloc(sizeof(struct mmc_host) + extra, GFP_KERNEL);
319 if (!host)
320 return NULL;
321
322 /* scanning will be enabled when we're ready */
323 host->rescan_disable = 1;
324 idr_preload(GFP_KERNEL);
325 spin_lock(&mmc_host_lock);
326 err = idr_alloc(&mmc_host_idr, host, 0, 0, GFP_NOWAIT);
327 if (err >= 0)
328 host->index = err;
329 spin_unlock(&mmc_host_lock);
330 idr_preload_end();
331 if (err < 0) {
332 kfree(host);
333 return NULL;
334 }
335
336 dev_set_name(&host->class_dev, "mmc%d", host->index);
337
338 host->parent = dev;
339 host->class_dev.parent = dev;
340 host->class_dev.class = &mmc_host_class;
341 device_initialize(&host->class_dev);
342 device_enable_async_suspend(&host->class_dev);
343
344 if (mmc_gpio_alloc(host)) {
345 put_device(&host->class_dev);
346 return NULL;
347 }
348
349 spin_lock_init(&host->lock);
350 init_waitqueue_head(&host->wq);
351 INIT_DELAYED_WORK(&host->detect, mmc_rescan);
352 setup_timer(&host->retune_timer, mmc_retune_timer, (unsigned long)host);
353
354 /*
355 * By default, hosts do not support SGIO or large requests.
356 * They have to set these according to their abilities.
357 */
358 host->max_segs = 1;
359 host->max_seg_size = PAGE_SIZE;
360
361 host->max_req_size = PAGE_SIZE;
362 host->max_blk_size = 512;
363 host->max_blk_count = PAGE_SIZE / 512;
364
365 return host;
366}
367
368EXPORT_SYMBOL(mmc_alloc_host);
369
370/**
371 * mmc_add_host - initialise host hardware
372 * @host: mmc host
373 *
374 * Register the host with the driver model. The host must be
375 * prepared to start servicing requests before this function
376 * completes.
377 */
378int mmc_add_host(struct mmc_host *host)
379{
380 int err;
381
382 WARN_ON((host->caps & MMC_CAP_SDIO_IRQ) &&
383 !host->ops->enable_sdio_irq);
384
385 err = device_add(&host->class_dev);
386 if (err)
387 return err;
388
389 led_trigger_register_simple(dev_name(&host->class_dev), &host->led);
390
391#ifdef CONFIG_DEBUG_FS
392 mmc_add_host_debugfs(host);
393#endif
394
395 mmc_start_host(host);
396 mmc_register_pm_notifier(host);
397
398 return 0;
399}
400
401EXPORT_SYMBOL(mmc_add_host);
402
403/**
404 * mmc_remove_host - remove host hardware
405 * @host: mmc host
406 *
407 * Unregister and remove all cards associated with this host,
408 * and power down the MMC bus. No new requests will be issued
409 * after this function has returned.
410 */
411void mmc_remove_host(struct mmc_host *host)
412{
413 mmc_unregister_pm_notifier(host);
414 mmc_stop_host(host);
415
416#ifdef CONFIG_DEBUG_FS
417 mmc_remove_host_debugfs(host);
418#endif
419
420 device_del(&host->class_dev);
421
422 led_trigger_unregister_simple(host->led);
423}
424
425EXPORT_SYMBOL(mmc_remove_host);
426
427/**
428 * mmc_free_host - free the host structure
429 * @host: mmc host
430 *
431 * Free the host once all references to it have been dropped.
432 */
433void mmc_free_host(struct mmc_host *host)
434{
435 mmc_pwrseq_free(host);
436 put_device(&host->class_dev);
437}
438
439EXPORT_SYMBOL(mmc_free_host);
1/*
2 * linux/drivers/mmc/core/host.c
3 *
4 * Copyright (C) 2003 Russell King, All Rights Reserved.
5 * Copyright (C) 2007-2008 Pierre Ossman
6 * Copyright (C) 2010 Linus Walleij
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/of.h>
19#include <linux/of_gpio.h>
20#include <linux/pagemap.h>
21#include <linux/export.h>
22#include <linux/leds.h>
23#include <linux/slab.h>
24
25#include <linux/mmc/host.h>
26#include <linux/mmc/card.h>
27#include <linux/mmc/slot-gpio.h>
28
29#include "core.h"
30#include "host.h"
31#include "slot-gpio.h"
32#include "pwrseq.h"
33
34#define cls_dev_to_mmc_host(d) container_of(d, struct mmc_host, class_dev)
35
36static DEFINE_IDA(mmc_host_ida);
37static DEFINE_SPINLOCK(mmc_host_lock);
38
39static void mmc_host_classdev_release(struct device *dev)
40{
41 struct mmc_host *host = cls_dev_to_mmc_host(dev);
42 spin_lock(&mmc_host_lock);
43 ida_remove(&mmc_host_ida, host->index);
44 spin_unlock(&mmc_host_lock);
45 kfree(host);
46}
47
48static struct class mmc_host_class = {
49 .name = "mmc_host",
50 .dev_release = mmc_host_classdev_release,
51};
52
53int mmc_register_host_class(void)
54{
55 return class_register(&mmc_host_class);
56}
57
58void mmc_unregister_host_class(void)
59{
60 class_unregister(&mmc_host_class);
61}
62
63void mmc_retune_enable(struct mmc_host *host)
64{
65 host->can_retune = 1;
66 if (host->retune_period)
67 mod_timer(&host->retune_timer,
68 jiffies + host->retune_period * HZ);
69}
70
71/*
72 * Pause re-tuning for a small set of operations. The pause begins after the
73 * next command and after first doing re-tuning.
74 */
75void mmc_retune_pause(struct mmc_host *host)
76{
77 if (!host->retune_paused) {
78 host->retune_paused = 1;
79 mmc_retune_needed(host);
80 mmc_retune_hold(host);
81 }
82}
83EXPORT_SYMBOL(mmc_retune_pause);
84
85void mmc_retune_unpause(struct mmc_host *host)
86{
87 if (host->retune_paused) {
88 host->retune_paused = 0;
89 mmc_retune_release(host);
90 }
91}
92EXPORT_SYMBOL(mmc_retune_unpause);
93
94void mmc_retune_disable(struct mmc_host *host)
95{
96 mmc_retune_unpause(host);
97 host->can_retune = 0;
98 del_timer_sync(&host->retune_timer);
99 host->retune_now = 0;
100 host->need_retune = 0;
101}
102
103void mmc_retune_timer_stop(struct mmc_host *host)
104{
105 del_timer_sync(&host->retune_timer);
106}
107EXPORT_SYMBOL(mmc_retune_timer_stop);
108
109void mmc_retune_hold(struct mmc_host *host)
110{
111 if (!host->hold_retune)
112 host->retune_now = 1;
113 host->hold_retune += 1;
114}
115
116void mmc_retune_release(struct mmc_host *host)
117{
118 if (host->hold_retune)
119 host->hold_retune -= 1;
120 else
121 WARN_ON(1);
122}
123
124int mmc_retune(struct mmc_host *host)
125{
126 bool return_to_hs400 = false;
127 int err;
128
129 if (host->retune_now)
130 host->retune_now = 0;
131 else
132 return 0;
133
134 if (!host->need_retune || host->doing_retune || !host->card)
135 return 0;
136
137 host->need_retune = 0;
138
139 host->doing_retune = 1;
140
141 if (host->ios.timing == MMC_TIMING_MMC_HS400) {
142 err = mmc_hs400_to_hs200(host->card);
143 if (err)
144 goto out;
145
146 return_to_hs400 = true;
147
148 if (host->ops->prepare_hs400_tuning)
149 host->ops->prepare_hs400_tuning(host, &host->ios);
150 }
151
152 err = mmc_execute_tuning(host->card);
153 if (err)
154 goto out;
155
156 if (return_to_hs400)
157 err = mmc_hs200_to_hs400(host->card);
158out:
159 host->doing_retune = 0;
160
161 return err;
162}
163
164static void mmc_retune_timer(unsigned long data)
165{
166 struct mmc_host *host = (struct mmc_host *)data;
167
168 mmc_retune_needed(host);
169}
170
171/**
172 * mmc_of_parse() - parse host's device-tree node
173 * @host: host whose node should be parsed.
174 *
175 * To keep the rest of the MMC subsystem unaware of whether DT has been
176 * used to to instantiate and configure this host instance or not, we
177 * parse the properties and set respective generic mmc-host flags and
178 * parameters.
179 */
180int mmc_of_parse(struct mmc_host *host)
181{
182 struct device_node *np;
183 u32 bus_width;
184 int ret;
185 bool cd_cap_invert, cd_gpio_invert = false;
186 bool ro_cap_invert, ro_gpio_invert = false;
187
188 if (!host->parent || !host->parent->of_node)
189 return 0;
190
191 np = host->parent->of_node;
192
193 /* "bus-width" is translated to MMC_CAP_*_BIT_DATA flags */
194 if (of_property_read_u32(np, "bus-width", &bus_width) < 0) {
195 dev_dbg(host->parent,
196 "\"bus-width\" property is missing, assuming 1 bit.\n");
197 bus_width = 1;
198 }
199
200 switch (bus_width) {
201 case 8:
202 host->caps |= MMC_CAP_8_BIT_DATA;
203 /* Hosts capable of 8-bit transfers can also do 4 bits */
204 case 4:
205 host->caps |= MMC_CAP_4_BIT_DATA;
206 break;
207 case 1:
208 break;
209 default:
210 dev_err(host->parent,
211 "Invalid \"bus-width\" value %u!\n", bus_width);
212 return -EINVAL;
213 }
214
215 /* f_max is obtained from the optional "max-frequency" property */
216 of_property_read_u32(np, "max-frequency", &host->f_max);
217
218 /*
219 * Configure CD and WP pins. They are both by default active low to
220 * match the SDHCI spec. If GPIOs are provided for CD and / or WP, the
221 * mmc-gpio helpers are used to attach, configure and use them. If
222 * polarity inversion is specified in DT, one of MMC_CAP2_CD_ACTIVE_HIGH
223 * and MMC_CAP2_RO_ACTIVE_HIGH capability-2 flags is set. If the
224 * "broken-cd" property is provided, the MMC_CAP_NEEDS_POLL capability
225 * is set. If the "non-removable" property is found, the
226 * MMC_CAP_NONREMOVABLE capability is set and no card-detection
227 * configuration is performed.
228 */
229
230 /* Parse Card Detection */
231 if (of_property_read_bool(np, "non-removable")) {
232 host->caps |= MMC_CAP_NONREMOVABLE;
233 } else {
234 cd_cap_invert = of_property_read_bool(np, "cd-inverted");
235
236 if (of_property_read_bool(np, "broken-cd"))
237 host->caps |= MMC_CAP_NEEDS_POLL;
238
239 ret = mmc_gpiod_request_cd(host, "cd", 0, true,
240 0, &cd_gpio_invert);
241 if (!ret)
242 dev_info(host->parent, "Got CD GPIO\n");
243 else if (ret != -ENOENT && ret != -ENOSYS)
244 return ret;
245
246 /*
247 * There are two ways to flag that the CD line is inverted:
248 * through the cd-inverted flag and by the GPIO line itself
249 * being inverted from the GPIO subsystem. This is a leftover
250 * from the times when the GPIO subsystem did not make it
251 * possible to flag a line as inverted.
252 *
253 * If the capability on the host AND the GPIO line are
254 * both inverted, the end result is that the CD line is
255 * not inverted.
256 */
257 if (cd_cap_invert ^ cd_gpio_invert)
258 host->caps2 |= MMC_CAP2_CD_ACTIVE_HIGH;
259 }
260
261 /* Parse Write Protection */
262 ro_cap_invert = of_property_read_bool(np, "wp-inverted");
263
264 ret = mmc_gpiod_request_ro(host, "wp", 0, false, 0, &ro_gpio_invert);
265 if (!ret)
266 dev_info(host->parent, "Got WP GPIO\n");
267 else if (ret != -ENOENT && ret != -ENOSYS)
268 return ret;
269
270 if (of_property_read_bool(np, "disable-wp"))
271 host->caps2 |= MMC_CAP2_NO_WRITE_PROTECT;
272
273 /* See the comment on CD inversion above */
274 if (ro_cap_invert ^ ro_gpio_invert)
275 host->caps2 |= MMC_CAP2_RO_ACTIVE_HIGH;
276
277 if (of_property_read_bool(np, "cap-sd-highspeed"))
278 host->caps |= MMC_CAP_SD_HIGHSPEED;
279 if (of_property_read_bool(np, "cap-mmc-highspeed"))
280 host->caps |= MMC_CAP_MMC_HIGHSPEED;
281 if (of_property_read_bool(np, "sd-uhs-sdr12"))
282 host->caps |= MMC_CAP_UHS_SDR12;
283 if (of_property_read_bool(np, "sd-uhs-sdr25"))
284 host->caps |= MMC_CAP_UHS_SDR25;
285 if (of_property_read_bool(np, "sd-uhs-sdr50"))
286 host->caps |= MMC_CAP_UHS_SDR50;
287 if (of_property_read_bool(np, "sd-uhs-sdr104"))
288 host->caps |= MMC_CAP_UHS_SDR104;
289 if (of_property_read_bool(np, "sd-uhs-ddr50"))
290 host->caps |= MMC_CAP_UHS_DDR50;
291 if (of_property_read_bool(np, "cap-power-off-card"))
292 host->caps |= MMC_CAP_POWER_OFF_CARD;
293 if (of_property_read_bool(np, "cap-mmc-hw-reset"))
294 host->caps |= MMC_CAP_HW_RESET;
295 if (of_property_read_bool(np, "cap-sdio-irq"))
296 host->caps |= MMC_CAP_SDIO_IRQ;
297 if (of_property_read_bool(np, "full-pwr-cycle"))
298 host->caps2 |= MMC_CAP2_FULL_PWR_CYCLE;
299 if (of_property_read_bool(np, "keep-power-in-suspend"))
300 host->pm_caps |= MMC_PM_KEEP_POWER;
301 if (of_property_read_bool(np, "wakeup-source") ||
302 of_property_read_bool(np, "enable-sdio-wakeup")) /* legacy */
303 host->pm_caps |= MMC_PM_WAKE_SDIO_IRQ;
304 if (of_property_read_bool(np, "mmc-ddr-1_8v"))
305 host->caps |= MMC_CAP_1_8V_DDR;
306 if (of_property_read_bool(np, "mmc-ddr-1_2v"))
307 host->caps |= MMC_CAP_1_2V_DDR;
308 if (of_property_read_bool(np, "mmc-hs200-1_8v"))
309 host->caps2 |= MMC_CAP2_HS200_1_8V_SDR;
310 if (of_property_read_bool(np, "mmc-hs200-1_2v"))
311 host->caps2 |= MMC_CAP2_HS200_1_2V_SDR;
312 if (of_property_read_bool(np, "mmc-hs400-1_8v"))
313 host->caps2 |= MMC_CAP2_HS400_1_8V | MMC_CAP2_HS200_1_8V_SDR;
314 if (of_property_read_bool(np, "mmc-hs400-1_2v"))
315 host->caps2 |= MMC_CAP2_HS400_1_2V | MMC_CAP2_HS200_1_2V_SDR;
316 if (of_property_read_bool(np, "mmc-hs400-enhanced-strobe"))
317 host->caps2 |= MMC_CAP2_HS400_ES;
318 if (of_property_read_bool(np, "no-sdio"))
319 host->caps2 |= MMC_CAP2_NO_SDIO;
320 if (of_property_read_bool(np, "no-sd"))
321 host->caps2 |= MMC_CAP2_NO_SD;
322 if (of_property_read_bool(np, "no-mmc"))
323 host->caps2 |= MMC_CAP2_NO_MMC;
324
325 host->dsr_req = !of_property_read_u32(np, "dsr", &host->dsr);
326 if (host->dsr_req && (host->dsr & ~0xffff)) {
327 dev_err(host->parent,
328 "device tree specified broken value for DSR: 0x%x, ignoring\n",
329 host->dsr);
330 host->dsr_req = 0;
331 }
332
333 return mmc_pwrseq_alloc(host);
334}
335
336EXPORT_SYMBOL(mmc_of_parse);
337
338/**
339 * mmc_alloc_host - initialise the per-host structure.
340 * @extra: sizeof private data structure
341 * @dev: pointer to host device model structure
342 *
343 * Initialise the per-host structure.
344 */
345struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
346{
347 int err;
348 struct mmc_host *host;
349
350 host = kzalloc(sizeof(struct mmc_host) + extra, GFP_KERNEL);
351 if (!host)
352 return NULL;
353
354 /* scanning will be enabled when we're ready */
355 host->rescan_disable = 1;
356
357again:
358 if (!ida_pre_get(&mmc_host_ida, GFP_KERNEL)) {
359 kfree(host);
360 return NULL;
361 }
362
363 spin_lock(&mmc_host_lock);
364 err = ida_get_new(&mmc_host_ida, &host->index);
365 spin_unlock(&mmc_host_lock);
366
367 if (err == -EAGAIN) {
368 goto again;
369 } else if (err) {
370 kfree(host);
371 return NULL;
372 }
373
374 dev_set_name(&host->class_dev, "mmc%d", host->index);
375
376 host->parent = dev;
377 host->class_dev.parent = dev;
378 host->class_dev.class = &mmc_host_class;
379 device_initialize(&host->class_dev);
380 device_enable_async_suspend(&host->class_dev);
381
382 if (mmc_gpio_alloc(host)) {
383 put_device(&host->class_dev);
384 return NULL;
385 }
386
387 spin_lock_init(&host->lock);
388 init_waitqueue_head(&host->wq);
389 INIT_DELAYED_WORK(&host->detect, mmc_rescan);
390 setup_timer(&host->retune_timer, mmc_retune_timer, (unsigned long)host);
391
392 /*
393 * By default, hosts do not support SGIO or large requests.
394 * They have to set these according to their abilities.
395 */
396 host->max_segs = 1;
397 host->max_seg_size = PAGE_SIZE;
398
399 host->max_req_size = PAGE_SIZE;
400 host->max_blk_size = 512;
401 host->max_blk_count = PAGE_SIZE / 512;
402
403 return host;
404}
405
406EXPORT_SYMBOL(mmc_alloc_host);
407
408/**
409 * mmc_add_host - initialise host hardware
410 * @host: mmc host
411 *
412 * Register the host with the driver model. The host must be
413 * prepared to start servicing requests before this function
414 * completes.
415 */
416int mmc_add_host(struct mmc_host *host)
417{
418 int err;
419
420 WARN_ON((host->caps & MMC_CAP_SDIO_IRQ) &&
421 !host->ops->enable_sdio_irq);
422
423 err = device_add(&host->class_dev);
424 if (err)
425 return err;
426
427 led_trigger_register_simple(dev_name(&host->class_dev), &host->led);
428
429#ifdef CONFIG_DEBUG_FS
430 mmc_add_host_debugfs(host);
431#endif
432
433 mmc_start_host(host);
434 mmc_register_pm_notifier(host);
435
436 return 0;
437}
438
439EXPORT_SYMBOL(mmc_add_host);
440
441/**
442 * mmc_remove_host - remove host hardware
443 * @host: mmc host
444 *
445 * Unregister and remove all cards associated with this host,
446 * and power down the MMC bus. No new requests will be issued
447 * after this function has returned.
448 */
449void mmc_remove_host(struct mmc_host *host)
450{
451 mmc_unregister_pm_notifier(host);
452 mmc_stop_host(host);
453
454#ifdef CONFIG_DEBUG_FS
455 mmc_remove_host_debugfs(host);
456#endif
457
458 device_del(&host->class_dev);
459
460 led_trigger_unregister_simple(host->led);
461}
462
463EXPORT_SYMBOL(mmc_remove_host);
464
465/**
466 * mmc_free_host - free the host structure
467 * @host: mmc host
468 *
469 * Free the host once all references to it have been dropped.
470 */
471void mmc_free_host(struct mmc_host *host)
472{
473 mmc_pwrseq_free(host);
474 put_device(&host->class_dev);
475}
476
477EXPORT_SYMBOL(mmc_free_host);