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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/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 "host.h"
29#include "slot-gpio.h"
30#include "pwrseq.h"
31#include "sdio_ops.h"
32
33#define cls_dev_to_mmc_host(d) container_of(d, struct mmc_host, class_dev)
34
35static DEFINE_IDA(mmc_host_ida);
36
37static void mmc_host_classdev_release(struct device *dev)
38{
39 struct mmc_host *host = cls_dev_to_mmc_host(dev);
40 wakeup_source_unregister(host->ws);
41 ida_simple_remove(&mmc_host_ida, host->index);
42 kfree(host);
43}
44
45static struct class mmc_host_class = {
46 .name = "mmc_host",
47 .dev_release = mmc_host_classdev_release,
48};
49
50int mmc_register_host_class(void)
51{
52 return class_register(&mmc_host_class);
53}
54
55void mmc_unregister_host_class(void)
56{
57 class_unregister(&mmc_host_class);
58}
59
60void mmc_retune_enable(struct mmc_host *host)
61{
62 host->can_retune = 1;
63 if (host->retune_period)
64 mod_timer(&host->retune_timer,
65 jiffies + host->retune_period * HZ);
66}
67
68/*
69 * Pause re-tuning for a small set of operations. The pause begins after the
70 * next command and after first doing re-tuning.
71 */
72void mmc_retune_pause(struct mmc_host *host)
73{
74 if (!host->retune_paused) {
75 host->retune_paused = 1;
76 mmc_retune_needed(host);
77 mmc_retune_hold(host);
78 }
79}
80EXPORT_SYMBOL(mmc_retune_pause);
81
82void mmc_retune_unpause(struct mmc_host *host)
83{
84 if (host->retune_paused) {
85 host->retune_paused = 0;
86 mmc_retune_release(host);
87 }
88}
89EXPORT_SYMBOL(mmc_retune_unpause);
90
91void mmc_retune_disable(struct mmc_host *host)
92{
93 mmc_retune_unpause(host);
94 host->can_retune = 0;
95 del_timer_sync(&host->retune_timer);
96 host->retune_now = 0;
97 host->need_retune = 0;
98}
99
100void mmc_retune_timer_stop(struct mmc_host *host)
101{
102 del_timer_sync(&host->retune_timer);
103}
104EXPORT_SYMBOL(mmc_retune_timer_stop);
105
106void mmc_retune_hold(struct mmc_host *host)
107{
108 if (!host->hold_retune)
109 host->retune_now = 1;
110 host->hold_retune += 1;
111}
112
113void mmc_retune_release(struct mmc_host *host)
114{
115 if (host->hold_retune)
116 host->hold_retune -= 1;
117 else
118 WARN_ON(1);
119}
120EXPORT_SYMBOL(mmc_retune_release);
121
122int mmc_retune(struct mmc_host *host)
123{
124 bool return_to_hs400 = false;
125 int err;
126
127 if (host->retune_now)
128 host->retune_now = 0;
129 else
130 return 0;
131
132 if (!host->need_retune || host->doing_retune || !host->card)
133 return 0;
134
135 host->need_retune = 0;
136
137 host->doing_retune = 1;
138
139 if (host->ios.timing == MMC_TIMING_MMC_HS400) {
140 err = mmc_hs400_to_hs200(host->card);
141 if (err)
142 goto out;
143
144 return_to_hs400 = true;
145 }
146
147 err = mmc_execute_tuning(host->card);
148 if (err)
149 goto out;
150
151 if (return_to_hs400)
152 err = mmc_hs200_to_hs400(host->card);
153out:
154 host->doing_retune = 0;
155
156 return err;
157}
158
159static void mmc_retune_timer(struct timer_list *t)
160{
161 struct mmc_host *host = from_timer(host, t, retune_timer);
162
163 mmc_retune_needed(host);
164}
165
166/**
167 * mmc_of_parse() - parse host's device-tree node
168 * @host: host whose node should be parsed.
169 *
170 * To keep the rest of the MMC subsystem unaware of whether DT has been
171 * used to to instantiate and configure this host instance or not, we
172 * parse the properties and set respective generic mmc-host flags and
173 * parameters.
174 */
175int mmc_of_parse(struct mmc_host *host)
176{
177 struct device *dev = host->parent;
178 u32 bus_width, drv_type, cd_debounce_delay_ms;
179 int ret;
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 fallthrough; /* 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
223 if (device_property_read_bool(dev, "non-removable")) {
224 host->caps |= MMC_CAP_NONREMOVABLE;
225 } else {
226 if (device_property_read_bool(dev, "cd-inverted"))
227 host->caps2 |= MMC_CAP2_CD_ACTIVE_HIGH;
228
229 if (device_property_read_u32(dev, "cd-debounce-delay-ms",
230 &cd_debounce_delay_ms))
231 cd_debounce_delay_ms = 200;
232
233 if (device_property_read_bool(dev, "broken-cd"))
234 host->caps |= MMC_CAP_NEEDS_POLL;
235
236 ret = mmc_gpiod_request_cd(host, "cd", 0, false,
237 cd_debounce_delay_ms * 1000);
238 if (!ret)
239 dev_info(host->parent, "Got CD GPIO\n");
240 else if (ret != -ENOENT && ret != -ENOSYS)
241 return ret;
242 }
243
244 /* Parse Write Protection */
245
246 if (device_property_read_bool(dev, "wp-inverted"))
247 host->caps2 |= MMC_CAP2_RO_ACTIVE_HIGH;
248
249 ret = mmc_gpiod_request_ro(host, "wp", 0, 0);
250 if (!ret)
251 dev_info(host->parent, "Got WP GPIO\n");
252 else if (ret != -ENOENT && ret != -ENOSYS)
253 return ret;
254
255 if (device_property_read_bool(dev, "disable-wp"))
256 host->caps2 |= MMC_CAP2_NO_WRITE_PROTECT;
257
258 if (device_property_read_bool(dev, "cap-sd-highspeed"))
259 host->caps |= MMC_CAP_SD_HIGHSPEED;
260 if (device_property_read_bool(dev, "cap-mmc-highspeed"))
261 host->caps |= MMC_CAP_MMC_HIGHSPEED;
262 if (device_property_read_bool(dev, "sd-uhs-sdr12"))
263 host->caps |= MMC_CAP_UHS_SDR12;
264 if (device_property_read_bool(dev, "sd-uhs-sdr25"))
265 host->caps |= MMC_CAP_UHS_SDR25;
266 if (device_property_read_bool(dev, "sd-uhs-sdr50"))
267 host->caps |= MMC_CAP_UHS_SDR50;
268 if (device_property_read_bool(dev, "sd-uhs-sdr104"))
269 host->caps |= MMC_CAP_UHS_SDR104;
270 if (device_property_read_bool(dev, "sd-uhs-ddr50"))
271 host->caps |= MMC_CAP_UHS_DDR50;
272 if (device_property_read_bool(dev, "cap-power-off-card"))
273 host->caps |= MMC_CAP_POWER_OFF_CARD;
274 if (device_property_read_bool(dev, "cap-mmc-hw-reset"))
275 host->caps |= MMC_CAP_HW_RESET;
276 if (device_property_read_bool(dev, "cap-sdio-irq"))
277 host->caps |= MMC_CAP_SDIO_IRQ;
278 if (device_property_read_bool(dev, "full-pwr-cycle"))
279 host->caps2 |= MMC_CAP2_FULL_PWR_CYCLE;
280 if (device_property_read_bool(dev, "full-pwr-cycle-in-suspend"))
281 host->caps2 |= MMC_CAP2_FULL_PWR_CYCLE_IN_SUSPEND;
282 if (device_property_read_bool(dev, "keep-power-in-suspend"))
283 host->pm_caps |= MMC_PM_KEEP_POWER;
284 if (device_property_read_bool(dev, "wakeup-source") ||
285 device_property_read_bool(dev, "enable-sdio-wakeup")) /* legacy */
286 host->pm_caps |= MMC_PM_WAKE_SDIO_IRQ;
287 if (device_property_read_bool(dev, "mmc-ddr-3_3v"))
288 host->caps |= MMC_CAP_3_3V_DDR;
289 if (device_property_read_bool(dev, "mmc-ddr-1_8v"))
290 host->caps |= MMC_CAP_1_8V_DDR;
291 if (device_property_read_bool(dev, "mmc-ddr-1_2v"))
292 host->caps |= MMC_CAP_1_2V_DDR;
293 if (device_property_read_bool(dev, "mmc-hs200-1_8v"))
294 host->caps2 |= MMC_CAP2_HS200_1_8V_SDR;
295 if (device_property_read_bool(dev, "mmc-hs200-1_2v"))
296 host->caps2 |= MMC_CAP2_HS200_1_2V_SDR;
297 if (device_property_read_bool(dev, "mmc-hs400-1_8v"))
298 host->caps2 |= MMC_CAP2_HS400_1_8V | MMC_CAP2_HS200_1_8V_SDR;
299 if (device_property_read_bool(dev, "mmc-hs400-1_2v"))
300 host->caps2 |= MMC_CAP2_HS400_1_2V | MMC_CAP2_HS200_1_2V_SDR;
301 if (device_property_read_bool(dev, "mmc-hs400-enhanced-strobe"))
302 host->caps2 |= MMC_CAP2_HS400_ES;
303 if (device_property_read_bool(dev, "no-sdio"))
304 host->caps2 |= MMC_CAP2_NO_SDIO;
305 if (device_property_read_bool(dev, "no-sd"))
306 host->caps2 |= MMC_CAP2_NO_SD;
307 if (device_property_read_bool(dev, "no-mmc"))
308 host->caps2 |= MMC_CAP2_NO_MMC;
309
310 /* Must be after "non-removable" check */
311 if (device_property_read_u32(dev, "fixed-emmc-driver-type", &drv_type) == 0) {
312 if (host->caps & MMC_CAP_NONREMOVABLE)
313 host->fixed_drv_type = drv_type;
314 else
315 dev_err(host->parent,
316 "can't use fixed driver type, media is removable\n");
317 }
318
319 host->dsr_req = !device_property_read_u32(dev, "dsr", &host->dsr);
320 if (host->dsr_req && (host->dsr & ~0xffff)) {
321 dev_err(host->parent,
322 "device tree specified broken value for DSR: 0x%x, ignoring\n",
323 host->dsr);
324 host->dsr_req = 0;
325 }
326
327 device_property_read_u32(dev, "post-power-on-delay-ms",
328 &host->ios.power_delay_ms);
329
330 return mmc_pwrseq_alloc(host);
331}
332
333EXPORT_SYMBOL(mmc_of_parse);
334
335/**
336 * mmc_of_parse_voltage - return mask of supported voltages
337 * @np: The device node need to be parsed.
338 * @mask: mask of voltages available for MMC/SD/SDIO
339 *
340 * Parse the "voltage-ranges" DT property, returning zero if it is not
341 * found, negative errno if the voltage-range specification is invalid,
342 * or one if the voltage-range is specified and successfully parsed.
343 */
344int mmc_of_parse_voltage(struct device_node *np, u32 *mask)
345{
346 const u32 *voltage_ranges;
347 int num_ranges, i;
348
349 voltage_ranges = of_get_property(np, "voltage-ranges", &num_ranges);
350 if (!voltage_ranges) {
351 pr_debug("%pOF: voltage-ranges unspecified\n", np);
352 return 0;
353 }
354 num_ranges = num_ranges / sizeof(*voltage_ranges) / 2;
355 if (!num_ranges) {
356 pr_err("%pOF: voltage-ranges empty\n", np);
357 return -EINVAL;
358 }
359
360 for (i = 0; i < num_ranges; i++) {
361 const int j = i * 2;
362 u32 ocr_mask;
363
364 ocr_mask = mmc_vddrange_to_ocrmask(
365 be32_to_cpu(voltage_ranges[j]),
366 be32_to_cpu(voltage_ranges[j + 1]));
367 if (!ocr_mask) {
368 pr_err("%pOF: voltage-range #%d is invalid\n",
369 np, i);
370 return -EINVAL;
371 }
372 *mask |= ocr_mask;
373 }
374
375 return 1;
376}
377EXPORT_SYMBOL(mmc_of_parse_voltage);
378
379/**
380 * mmc_alloc_host - initialise the per-host structure.
381 * @extra: sizeof private data structure
382 * @dev: pointer to host device model structure
383 *
384 * Initialise the per-host structure.
385 */
386struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
387{
388 int err;
389 struct mmc_host *host;
390
391 host = kzalloc(sizeof(struct mmc_host) + extra, GFP_KERNEL);
392 if (!host)
393 return NULL;
394
395 /* scanning will be enabled when we're ready */
396 host->rescan_disable = 1;
397
398 err = ida_simple_get(&mmc_host_ida, 0, 0, GFP_KERNEL);
399 if (err < 0) {
400 kfree(host);
401 return NULL;
402 }
403
404 host->index = err;
405
406 dev_set_name(&host->class_dev, "mmc%d", host->index);
407 host->ws = wakeup_source_register(NULL, dev_name(&host->class_dev));
408
409 host->parent = dev;
410 host->class_dev.parent = dev;
411 host->class_dev.class = &mmc_host_class;
412 device_initialize(&host->class_dev);
413 device_enable_async_suspend(&host->class_dev);
414
415 if (mmc_gpio_alloc(host)) {
416 put_device(&host->class_dev);
417 return NULL;
418 }
419
420 spin_lock_init(&host->lock);
421 init_waitqueue_head(&host->wq);
422 INIT_DELAYED_WORK(&host->detect, mmc_rescan);
423 INIT_DELAYED_WORK(&host->sdio_irq_work, sdio_irq_work);
424 timer_setup(&host->retune_timer, mmc_retune_timer, 0);
425
426 /*
427 * By default, hosts do not support SGIO or large requests.
428 * They have to set these according to their abilities.
429 */
430 host->max_segs = 1;
431 host->max_seg_size = PAGE_SIZE;
432
433 host->max_req_size = PAGE_SIZE;
434 host->max_blk_size = 512;
435 host->max_blk_count = PAGE_SIZE / 512;
436
437 host->fixed_drv_type = -EINVAL;
438 host->ios.power_delay_ms = 10;
439 host->ios.power_mode = MMC_POWER_UNDEFINED;
440
441 return host;
442}
443
444EXPORT_SYMBOL(mmc_alloc_host);
445
446/**
447 * mmc_add_host - initialise host hardware
448 * @host: mmc host
449 *
450 * Register the host with the driver model. The host must be
451 * prepared to start servicing requests before this function
452 * completes.
453 */
454int mmc_add_host(struct mmc_host *host)
455{
456 int err;
457
458 WARN_ON((host->caps & MMC_CAP_SDIO_IRQ) &&
459 !host->ops->enable_sdio_irq);
460
461 err = device_add(&host->class_dev);
462 if (err)
463 return err;
464
465 led_trigger_register_simple(dev_name(&host->class_dev), &host->led);
466
467#ifdef CONFIG_DEBUG_FS
468 mmc_add_host_debugfs(host);
469#endif
470
471 mmc_start_host(host);
472 mmc_register_pm_notifier(host);
473
474 return 0;
475}
476
477EXPORT_SYMBOL(mmc_add_host);
478
479/**
480 * mmc_remove_host - remove host hardware
481 * @host: mmc host
482 *
483 * Unregister and remove all cards associated with this host,
484 * and power down the MMC bus. No new requests will be issued
485 * after this function has returned.
486 */
487void mmc_remove_host(struct mmc_host *host)
488{
489 mmc_unregister_pm_notifier(host);
490 mmc_stop_host(host);
491
492#ifdef CONFIG_DEBUG_FS
493 mmc_remove_host_debugfs(host);
494#endif
495
496 device_del(&host->class_dev);
497
498 led_trigger_unregister_simple(host->led);
499}
500
501EXPORT_SYMBOL(mmc_remove_host);
502
503/**
504 * mmc_free_host - free the host structure
505 * @host: mmc host
506 *
507 * Free the host once all references to it have been dropped.
508 */
509void mmc_free_host(struct mmc_host *host)
510{
511 mmc_pwrseq_free(host);
512 put_device(&host->class_dev);
513}
514
515EXPORT_SYMBOL(mmc_free_host);