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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// 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/export.h>
19#include <linux/leds.h>
20#include <linux/slab.h>
21
22#include <linux/mmc/host.h>
23#include <linux/mmc/card.h>
24#include <linux/mmc/slot-gpio.h>
25
26#include "core.h"
27#include "host.h"
28#include "slot-gpio.h"
29#include "pwrseq.h"
30#include "sdio_ops.h"
31
32#define cls_dev_to_mmc_host(d) container_of(d, struct mmc_host, class_dev)
33
34static DEFINE_IDA(mmc_host_ida);
35
36static void mmc_host_classdev_release(struct device *dev)
37{
38 struct mmc_host *host = cls_dev_to_mmc_host(dev);
39 ida_simple_remove(&mmc_host_ida, host->index);
40 kfree(host);
41}
42
43static struct class mmc_host_class = {
44 .name = "mmc_host",
45 .dev_release = mmc_host_classdev_release,
46};
47
48int mmc_register_host_class(void)
49{
50 return class_register(&mmc_host_class);
51}
52
53void mmc_unregister_host_class(void)
54{
55 class_unregister(&mmc_host_class);
56}
57
58void mmc_retune_enable(struct mmc_host *host)
59{
60 host->can_retune = 1;
61 if (host->retune_period)
62 mod_timer(&host->retune_timer,
63 jiffies + host->retune_period * HZ);
64}
65
66/*
67 * Pause re-tuning for a small set of operations. The pause begins after the
68 * next command and after first doing re-tuning.
69 */
70void mmc_retune_pause(struct mmc_host *host)
71{
72 if (!host->retune_paused) {
73 host->retune_paused = 1;
74 mmc_retune_needed(host);
75 mmc_retune_hold(host);
76 }
77}
78EXPORT_SYMBOL(mmc_retune_pause);
79
80void mmc_retune_unpause(struct mmc_host *host)
81{
82 if (host->retune_paused) {
83 host->retune_paused = 0;
84 mmc_retune_release(host);
85 }
86}
87EXPORT_SYMBOL(mmc_retune_unpause);
88
89void mmc_retune_disable(struct mmc_host *host)
90{
91 mmc_retune_unpause(host);
92 host->can_retune = 0;
93 del_timer_sync(&host->retune_timer);
94 host->retune_now = 0;
95 host->need_retune = 0;
96}
97
98void mmc_retune_timer_stop(struct mmc_host *host)
99{
100 del_timer_sync(&host->retune_timer);
101}
102EXPORT_SYMBOL(mmc_retune_timer_stop);
103
104void mmc_retune_hold(struct mmc_host *host)
105{
106 if (!host->hold_retune)
107 host->retune_now = 1;
108 host->hold_retune += 1;
109}
110
111void mmc_retune_release(struct mmc_host *host)
112{
113 if (host->hold_retune)
114 host->hold_retune -= 1;
115 else
116 WARN_ON(1);
117}
118EXPORT_SYMBOL(mmc_retune_release);
119
120int mmc_retune(struct mmc_host *host)
121{
122 bool return_to_hs400 = false;
123 int err;
124
125 if (host->retune_now)
126 host->retune_now = 0;
127 else
128 return 0;
129
130 if (!host->need_retune || host->doing_retune || !host->card)
131 return 0;
132
133 host->need_retune = 0;
134
135 host->doing_retune = 1;
136
137 if (host->ios.timing == MMC_TIMING_MMC_HS400) {
138 err = mmc_hs400_to_hs200(host->card);
139 if (err)
140 goto out;
141
142 return_to_hs400 = true;
143 }
144
145 err = mmc_execute_tuning(host->card);
146 if (err)
147 goto out;
148
149 if (return_to_hs400)
150 err = mmc_hs200_to_hs400(host->card);
151out:
152 host->doing_retune = 0;
153
154 return err;
155}
156
157static void mmc_retune_timer(struct timer_list *t)
158{
159 struct mmc_host *host = from_timer(host, t, retune_timer);
160
161 mmc_retune_needed(host);
162}
163
164/**
165 * mmc_of_parse() - parse host's device-tree node
166 * @host: host whose node should be parsed.
167 *
168 * To keep the rest of the MMC subsystem unaware of whether DT has been
169 * used to to instantiate and configure this host instance or not, we
170 * parse the properties and set respective generic mmc-host flags and
171 * parameters.
172 */
173int mmc_of_parse(struct mmc_host *host)
174{
175 struct device *dev = host->parent;
176 u32 bus_width, drv_type, cd_debounce_delay_ms;
177 int ret;
178 bool cd_cap_invert, cd_gpio_invert = false;
179 bool ro_cap_invert, ro_gpio_invert = false;
180
181 if (!dev || !dev_fwnode(dev))
182 return 0;
183
184 /* "bus-width" is translated to MMC_CAP_*_BIT_DATA flags */
185 if (device_property_read_u32(dev, "bus-width", &bus_width) < 0) {
186 dev_dbg(host->parent,
187 "\"bus-width\" property is missing, assuming 1 bit.\n");
188 bus_width = 1;
189 }
190
191 switch (bus_width) {
192 case 8:
193 host->caps |= MMC_CAP_8_BIT_DATA;
194 /* fall through - Hosts capable of 8-bit can also do 4 bits */
195 case 4:
196 host->caps |= MMC_CAP_4_BIT_DATA;
197 break;
198 case 1:
199 break;
200 default:
201 dev_err(host->parent,
202 "Invalid \"bus-width\" value %u!\n", bus_width);
203 return -EINVAL;
204 }
205
206 /* f_max is obtained from the optional "max-frequency" property */
207 device_property_read_u32(dev, "max-frequency", &host->f_max);
208
209 /*
210 * Configure CD and WP pins. They are both by default active low to
211 * match the SDHCI spec. If GPIOs are provided for CD and / or WP, the
212 * mmc-gpio helpers are used to attach, configure and use them. If
213 * polarity inversion is specified in DT, one of MMC_CAP2_CD_ACTIVE_HIGH
214 * and MMC_CAP2_RO_ACTIVE_HIGH capability-2 flags is set. If the
215 * "broken-cd" property is provided, the MMC_CAP_NEEDS_POLL capability
216 * is set. If the "non-removable" property is found, the
217 * MMC_CAP_NONREMOVABLE capability is set and no card-detection
218 * configuration is performed.
219 */
220
221 /* Parse Card Detection */
222 if (device_property_read_bool(dev, "non-removable")) {
223 host->caps |= MMC_CAP_NONREMOVABLE;
224 } else {
225 cd_cap_invert = device_property_read_bool(dev, "cd-inverted");
226
227 if (device_property_read_u32(dev, "cd-debounce-delay-ms",
228 &cd_debounce_delay_ms))
229 cd_debounce_delay_ms = 200;
230
231 if (device_property_read_bool(dev, "broken-cd"))
232 host->caps |= MMC_CAP_NEEDS_POLL;
233
234 ret = mmc_gpiod_request_cd(host, "cd", 0, false,
235 cd_debounce_delay_ms * 1000,
236 &cd_gpio_invert);
237 if (!ret)
238 dev_info(host->parent, "Got CD GPIO\n");
239 else if (ret != -ENOENT && ret != -ENOSYS)
240 return ret;
241
242 /*
243 * There are two ways to flag that the CD line is inverted:
244 * through the cd-inverted flag and by the GPIO line itself
245 * being inverted from the GPIO subsystem. This is a leftover
246 * from the times when the GPIO subsystem did not make it
247 * possible to flag a line as inverted.
248 *
249 * If the capability on the host AND the GPIO line are
250 * both inverted, the end result is that the CD line is
251 * not inverted.
252 */
253 if (cd_cap_invert ^ cd_gpio_invert)
254 host->caps2 |= MMC_CAP2_CD_ACTIVE_HIGH;
255 }
256
257 /* Parse Write Protection */
258 ro_cap_invert = device_property_read_bool(dev, "wp-inverted");
259
260 ret = mmc_gpiod_request_ro(host, "wp", 0, 0, &ro_gpio_invert);
261 if (!ret)
262 dev_info(host->parent, "Got WP GPIO\n");
263 else if (ret != -ENOENT && ret != -ENOSYS)
264 return ret;
265
266 if (device_property_read_bool(dev, "disable-wp"))
267 host->caps2 |= MMC_CAP2_NO_WRITE_PROTECT;
268
269 /* See the comment on CD inversion above */
270 if (ro_cap_invert ^ ro_gpio_invert)
271 host->caps2 |= MMC_CAP2_RO_ACTIVE_HIGH;
272
273 if (device_property_read_bool(dev, "cap-sd-highspeed"))
274 host->caps |= MMC_CAP_SD_HIGHSPEED;
275 if (device_property_read_bool(dev, "cap-mmc-highspeed"))
276 host->caps |= MMC_CAP_MMC_HIGHSPEED;
277 if (device_property_read_bool(dev, "sd-uhs-sdr12"))
278 host->caps |= MMC_CAP_UHS_SDR12;
279 if (device_property_read_bool(dev, "sd-uhs-sdr25"))
280 host->caps |= MMC_CAP_UHS_SDR25;
281 if (device_property_read_bool(dev, "sd-uhs-sdr50"))
282 host->caps |= MMC_CAP_UHS_SDR50;
283 if (device_property_read_bool(dev, "sd-uhs-sdr104"))
284 host->caps |= MMC_CAP_UHS_SDR104;
285 if (device_property_read_bool(dev, "sd-uhs-ddr50"))
286 host->caps |= MMC_CAP_UHS_DDR50;
287 if (device_property_read_bool(dev, "cap-power-off-card"))
288 host->caps |= MMC_CAP_POWER_OFF_CARD;
289 if (device_property_read_bool(dev, "cap-mmc-hw-reset"))
290 host->caps |= MMC_CAP_HW_RESET;
291 if (device_property_read_bool(dev, "cap-sdio-irq"))
292 host->caps |= MMC_CAP_SDIO_IRQ;
293 if (device_property_read_bool(dev, "full-pwr-cycle"))
294 host->caps2 |= MMC_CAP2_FULL_PWR_CYCLE;
295 if (device_property_read_bool(dev, "keep-power-in-suspend"))
296 host->pm_caps |= MMC_PM_KEEP_POWER;
297 if (device_property_read_bool(dev, "wakeup-source") ||
298 device_property_read_bool(dev, "enable-sdio-wakeup")) /* legacy */
299 host->pm_caps |= MMC_PM_WAKE_SDIO_IRQ;
300 if (device_property_read_bool(dev, "mmc-ddr-3_3v"))
301 host->caps |= MMC_CAP_3_3V_DDR;
302 if (device_property_read_bool(dev, "mmc-ddr-1_8v"))
303 host->caps |= MMC_CAP_1_8V_DDR;
304 if (device_property_read_bool(dev, "mmc-ddr-1_2v"))
305 host->caps |= MMC_CAP_1_2V_DDR;
306 if (device_property_read_bool(dev, "mmc-hs200-1_8v"))
307 host->caps2 |= MMC_CAP2_HS200_1_8V_SDR;
308 if (device_property_read_bool(dev, "mmc-hs200-1_2v"))
309 host->caps2 |= MMC_CAP2_HS200_1_2V_SDR;
310 if (device_property_read_bool(dev, "mmc-hs400-1_8v"))
311 host->caps2 |= MMC_CAP2_HS400_1_8V | MMC_CAP2_HS200_1_8V_SDR;
312 if (device_property_read_bool(dev, "mmc-hs400-1_2v"))
313 host->caps2 |= MMC_CAP2_HS400_1_2V | MMC_CAP2_HS200_1_2V_SDR;
314 if (device_property_read_bool(dev, "mmc-hs400-enhanced-strobe"))
315 host->caps2 |= MMC_CAP2_HS400_ES;
316 if (device_property_read_bool(dev, "no-sdio"))
317 host->caps2 |= MMC_CAP2_NO_SDIO;
318 if (device_property_read_bool(dev, "no-sd"))
319 host->caps2 |= MMC_CAP2_NO_SD;
320 if (device_property_read_bool(dev, "no-mmc"))
321 host->caps2 |= MMC_CAP2_NO_MMC;
322
323 /* Must be after "non-removable" check */
324 if (device_property_read_u32(dev, "fixed-emmc-driver-type", &drv_type) == 0) {
325 if (host->caps & MMC_CAP_NONREMOVABLE)
326 host->fixed_drv_type = drv_type;
327 else
328 dev_err(host->parent,
329 "can't use fixed driver type, media is removable\n");
330 }
331
332 host->dsr_req = !device_property_read_u32(dev, "dsr", &host->dsr);
333 if (host->dsr_req && (host->dsr & ~0xffff)) {
334 dev_err(host->parent,
335 "device tree specified broken value for DSR: 0x%x, ignoring\n",
336 host->dsr);
337 host->dsr_req = 0;
338 }
339
340 device_property_read_u32(dev, "post-power-on-delay-ms",
341 &host->ios.power_delay_ms);
342
343 return mmc_pwrseq_alloc(host);
344}
345
346EXPORT_SYMBOL(mmc_of_parse);
347
348/**
349 * mmc_of_parse_voltage - return mask of supported voltages
350 * @np: The device node need to be parsed.
351 * @mask: mask of voltages available for MMC/SD/SDIO
352 *
353 * Parse the "voltage-ranges" DT property, returning zero if it is not
354 * found, negative errno if the voltage-range specification is invalid,
355 * or one if the voltage-range is specified and successfully parsed.
356 */
357int mmc_of_parse_voltage(struct device_node *np, u32 *mask)
358{
359 const u32 *voltage_ranges;
360 int num_ranges, i;
361
362 voltage_ranges = of_get_property(np, "voltage-ranges", &num_ranges);
363 if (!voltage_ranges) {
364 pr_debug("%pOF: voltage-ranges unspecified\n", np);
365 return 0;
366 }
367 num_ranges = num_ranges / sizeof(*voltage_ranges) / 2;
368 if (!num_ranges) {
369 pr_err("%pOF: voltage-ranges empty\n", np);
370 return -EINVAL;
371 }
372
373 for (i = 0; i < num_ranges; i++) {
374 const int j = i * 2;
375 u32 ocr_mask;
376
377 ocr_mask = mmc_vddrange_to_ocrmask(
378 be32_to_cpu(voltage_ranges[j]),
379 be32_to_cpu(voltage_ranges[j + 1]));
380 if (!ocr_mask) {
381 pr_err("%pOF: voltage-range #%d is invalid\n",
382 np, i);
383 return -EINVAL;
384 }
385 *mask |= ocr_mask;
386 }
387
388 return 1;
389}
390EXPORT_SYMBOL(mmc_of_parse_voltage);
391
392/**
393 * mmc_alloc_host - initialise the per-host structure.
394 * @extra: sizeof private data structure
395 * @dev: pointer to host device model structure
396 *
397 * Initialise the per-host structure.
398 */
399struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
400{
401 int err;
402 struct mmc_host *host;
403
404 host = kzalloc(sizeof(struct mmc_host) + extra, GFP_KERNEL);
405 if (!host)
406 return NULL;
407
408 /* scanning will be enabled when we're ready */
409 host->rescan_disable = 1;
410
411 err = ida_simple_get(&mmc_host_ida, 0, 0, GFP_KERNEL);
412 if (err < 0) {
413 kfree(host);
414 return NULL;
415 }
416
417 host->index = err;
418
419 dev_set_name(&host->class_dev, "mmc%d", host->index);
420
421 host->parent = dev;
422 host->class_dev.parent = dev;
423 host->class_dev.class = &mmc_host_class;
424 device_initialize(&host->class_dev);
425 device_enable_async_suspend(&host->class_dev);
426
427 if (mmc_gpio_alloc(host)) {
428 put_device(&host->class_dev);
429 return NULL;
430 }
431
432 spin_lock_init(&host->lock);
433 init_waitqueue_head(&host->wq);
434 INIT_DELAYED_WORK(&host->detect, mmc_rescan);
435 INIT_DELAYED_WORK(&host->sdio_irq_work, sdio_irq_work);
436 timer_setup(&host->retune_timer, mmc_retune_timer, 0);
437
438 /*
439 * By default, hosts do not support SGIO or large requests.
440 * They have to set these according to their abilities.
441 */
442 host->max_segs = 1;
443 host->max_seg_size = PAGE_SIZE;
444
445 host->max_req_size = PAGE_SIZE;
446 host->max_blk_size = 512;
447 host->max_blk_count = PAGE_SIZE / 512;
448
449 host->fixed_drv_type = -EINVAL;
450 host->ios.power_delay_ms = 10;
451
452 return host;
453}
454
455EXPORT_SYMBOL(mmc_alloc_host);
456
457/**
458 * mmc_add_host - initialise host hardware
459 * @host: mmc host
460 *
461 * Register the host with the driver model. The host must be
462 * prepared to start servicing requests before this function
463 * completes.
464 */
465int mmc_add_host(struct mmc_host *host)
466{
467 int err;
468
469 WARN_ON((host->caps & MMC_CAP_SDIO_IRQ) &&
470 !host->ops->enable_sdio_irq);
471
472 err = device_add(&host->class_dev);
473 if (err)
474 return err;
475
476 led_trigger_register_simple(dev_name(&host->class_dev), &host->led);
477
478#ifdef CONFIG_DEBUG_FS
479 mmc_add_host_debugfs(host);
480#endif
481
482 mmc_start_host(host);
483 mmc_register_pm_notifier(host);
484
485 return 0;
486}
487
488EXPORT_SYMBOL(mmc_add_host);
489
490/**
491 * mmc_remove_host - remove host hardware
492 * @host: mmc host
493 *
494 * Unregister and remove all cards associated with this host,
495 * and power down the MMC bus. No new requests will be issued
496 * after this function has returned.
497 */
498void mmc_remove_host(struct mmc_host *host)
499{
500 mmc_unregister_pm_notifier(host);
501 mmc_stop_host(host);
502
503#ifdef CONFIG_DEBUG_FS
504 mmc_remove_host_debugfs(host);
505#endif
506
507 device_del(&host->class_dev);
508
509 led_trigger_unregister_simple(host->led);
510}
511
512EXPORT_SYMBOL(mmc_remove_host);
513
514/**
515 * mmc_free_host - free the host structure
516 * @host: mmc host
517 *
518 * Free the host once all references to it have been dropped.
519 */
520void mmc_free_host(struct mmc_host *host)
521{
522 mmc_pwrseq_free(host);
523 put_device(&host->class_dev);
524}
525
526EXPORT_SYMBOL(mmc_free_host);