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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/pagemap.h>
19#include <linux/export.h>
20#include <linux/leds.h>
21#include <linux/slab.h>
22#include <linux/suspend.h>
23
24#include <linux/mmc/host.h>
25#include <linux/mmc/card.h>
26
27#include "core.h"
28#include "host.h"
29
30#define cls_dev_to_mmc_host(d) container_of(d, struct mmc_host, class_dev)
31
32static void mmc_host_classdev_release(struct device *dev)
33{
34 struct mmc_host *host = cls_dev_to_mmc_host(dev);
35 kfree(host);
36}
37
38static struct class mmc_host_class = {
39 .name = "mmc_host",
40 .dev_release = mmc_host_classdev_release,
41};
42
43int mmc_register_host_class(void)
44{
45 return class_register(&mmc_host_class);
46}
47
48void mmc_unregister_host_class(void)
49{
50 class_unregister(&mmc_host_class);
51}
52
53static DEFINE_IDR(mmc_host_idr);
54static DEFINE_SPINLOCK(mmc_host_lock);
55
56#ifdef CONFIG_MMC_CLKGATE
57static ssize_t clkgate_delay_show(struct device *dev,
58 struct device_attribute *attr, char *buf)
59{
60 struct mmc_host *host = cls_dev_to_mmc_host(dev);
61 return snprintf(buf, PAGE_SIZE, "%lu\n", host->clkgate_delay);
62}
63
64static ssize_t clkgate_delay_store(struct device *dev,
65 struct device_attribute *attr, const char *buf, size_t count)
66{
67 struct mmc_host *host = cls_dev_to_mmc_host(dev);
68 unsigned long flags, value;
69
70 if (kstrtoul(buf, 0, &value))
71 return -EINVAL;
72
73 spin_lock_irqsave(&host->clk_lock, flags);
74 host->clkgate_delay = value;
75 spin_unlock_irqrestore(&host->clk_lock, flags);
76 return count;
77}
78
79/*
80 * Enabling clock gating will make the core call out to the host
81 * once up and once down when it performs a request or card operation
82 * intermingled in any fashion. The driver will see this through
83 * set_ios() operations with ios.clock field set to 0 to gate (disable)
84 * the block clock, and to the old frequency to enable it again.
85 */
86static void mmc_host_clk_gate_delayed(struct mmc_host *host)
87{
88 unsigned long tick_ns;
89 unsigned long freq = host->ios.clock;
90 unsigned long flags;
91
92 if (!freq) {
93 pr_debug("%s: frequency set to 0 in disable function, "
94 "this means the clock is already disabled.\n",
95 mmc_hostname(host));
96 return;
97 }
98 /*
99 * New requests may have appeared while we were scheduling,
100 * then there is no reason to delay the check before
101 * clk_disable().
102 */
103 spin_lock_irqsave(&host->clk_lock, flags);
104
105 /*
106 * Delay n bus cycles (at least 8 from MMC spec) before attempting
107 * to disable the MCI block clock. The reference count may have
108 * gone up again after this delay due to rescheduling!
109 */
110 if (!host->clk_requests) {
111 spin_unlock_irqrestore(&host->clk_lock, flags);
112 tick_ns = DIV_ROUND_UP(1000000000, freq);
113 ndelay(host->clk_delay * tick_ns);
114 } else {
115 /* New users appeared while waiting for this work */
116 spin_unlock_irqrestore(&host->clk_lock, flags);
117 return;
118 }
119 mutex_lock(&host->clk_gate_mutex);
120 spin_lock_irqsave(&host->clk_lock, flags);
121 if (!host->clk_requests) {
122 spin_unlock_irqrestore(&host->clk_lock, flags);
123 /* This will set host->ios.clock to 0 */
124 mmc_gate_clock(host);
125 spin_lock_irqsave(&host->clk_lock, flags);
126 pr_debug("%s: gated MCI clock\n", mmc_hostname(host));
127 }
128 spin_unlock_irqrestore(&host->clk_lock, flags);
129 mutex_unlock(&host->clk_gate_mutex);
130}
131
132/*
133 * Internal work. Work to disable the clock at some later point.
134 */
135static void mmc_host_clk_gate_work(struct work_struct *work)
136{
137 struct mmc_host *host = container_of(work, struct mmc_host,
138 clk_gate_work.work);
139
140 mmc_host_clk_gate_delayed(host);
141}
142
143/**
144 * mmc_host_clk_hold - ungate hardware MCI clocks
145 * @host: host to ungate.
146 *
147 * Makes sure the host ios.clock is restored to a non-zero value
148 * past this call. Increase clock reference count and ungate clock
149 * if we're the first user.
150 */
151void mmc_host_clk_hold(struct mmc_host *host)
152{
153 unsigned long flags;
154
155 /* cancel any clock gating work scheduled by mmc_host_clk_release() */
156 cancel_delayed_work_sync(&host->clk_gate_work);
157 mutex_lock(&host->clk_gate_mutex);
158 spin_lock_irqsave(&host->clk_lock, flags);
159 if (host->clk_gated) {
160 spin_unlock_irqrestore(&host->clk_lock, flags);
161 mmc_ungate_clock(host);
162 spin_lock_irqsave(&host->clk_lock, flags);
163 pr_debug("%s: ungated MCI clock\n", mmc_hostname(host));
164 }
165 host->clk_requests++;
166 spin_unlock_irqrestore(&host->clk_lock, flags);
167 mutex_unlock(&host->clk_gate_mutex);
168}
169
170/**
171 * mmc_host_may_gate_card - check if this card may be gated
172 * @card: card to check.
173 */
174static bool mmc_host_may_gate_card(struct mmc_card *card)
175{
176 /* If there is no card we may gate it */
177 if (!card)
178 return true;
179 /*
180 * Don't gate SDIO cards! These need to be clocked at all times
181 * since they may be independent systems generating interrupts
182 * and other events. The clock requests counter from the core will
183 * go down to zero since the core does not need it, but we will not
184 * gate the clock, because there is somebody out there that may still
185 * be using it.
186 */
187 return !(card->quirks & MMC_QUIRK_BROKEN_CLK_GATING);
188}
189
190/**
191 * mmc_host_clk_release - gate off hardware MCI clocks
192 * @host: host to gate.
193 *
194 * Calls the host driver with ios.clock set to zero as often as possible
195 * in order to gate off hardware MCI clocks. Decrease clock reference
196 * count and schedule disabling of clock.
197 */
198void mmc_host_clk_release(struct mmc_host *host)
199{
200 unsigned long flags;
201
202 spin_lock_irqsave(&host->clk_lock, flags);
203 host->clk_requests--;
204 if (mmc_host_may_gate_card(host->card) &&
205 !host->clk_requests)
206 queue_delayed_work(system_nrt_wq, &host->clk_gate_work,
207 msecs_to_jiffies(host->clkgate_delay));
208 spin_unlock_irqrestore(&host->clk_lock, flags);
209}
210
211/**
212 * mmc_host_clk_rate - get current clock frequency setting
213 * @host: host to get the clock frequency for.
214 *
215 * Returns current clock frequency regardless of gating.
216 */
217unsigned int mmc_host_clk_rate(struct mmc_host *host)
218{
219 unsigned long freq;
220 unsigned long flags;
221
222 spin_lock_irqsave(&host->clk_lock, flags);
223 if (host->clk_gated)
224 freq = host->clk_old;
225 else
226 freq = host->ios.clock;
227 spin_unlock_irqrestore(&host->clk_lock, flags);
228 return freq;
229}
230
231/**
232 * mmc_host_clk_init - set up clock gating code
233 * @host: host with potential clock to control
234 */
235static inline void mmc_host_clk_init(struct mmc_host *host)
236{
237 host->clk_requests = 0;
238 /* Hold MCI clock for 8 cycles by default */
239 host->clk_delay = 8;
240 /*
241 * Default clock gating delay is 0ms to avoid wasting power.
242 * This value can be tuned by writing into sysfs entry.
243 */
244 host->clkgate_delay = 0;
245 host->clk_gated = false;
246 INIT_DELAYED_WORK(&host->clk_gate_work, mmc_host_clk_gate_work);
247 spin_lock_init(&host->clk_lock);
248 mutex_init(&host->clk_gate_mutex);
249}
250
251/**
252 * mmc_host_clk_exit - shut down clock gating code
253 * @host: host with potential clock to control
254 */
255static inline void mmc_host_clk_exit(struct mmc_host *host)
256{
257 /*
258 * Wait for any outstanding gate and then make sure we're
259 * ungated before exiting.
260 */
261 if (cancel_delayed_work_sync(&host->clk_gate_work))
262 mmc_host_clk_gate_delayed(host);
263 if (host->clk_gated)
264 mmc_host_clk_hold(host);
265 /* There should be only one user now */
266 WARN_ON(host->clk_requests > 1);
267}
268
269static inline void mmc_host_clk_sysfs_init(struct mmc_host *host)
270{
271 host->clkgate_delay_attr.show = clkgate_delay_show;
272 host->clkgate_delay_attr.store = clkgate_delay_store;
273 sysfs_attr_init(&host->clkgate_delay_attr.attr);
274 host->clkgate_delay_attr.attr.name = "clkgate_delay";
275 host->clkgate_delay_attr.attr.mode = S_IRUGO | S_IWUSR;
276 if (device_create_file(&host->class_dev, &host->clkgate_delay_attr))
277 pr_err("%s: Failed to create clkgate_delay sysfs entry\n",
278 mmc_hostname(host));
279}
280#else
281
282static inline void mmc_host_clk_init(struct mmc_host *host)
283{
284}
285
286static inline void mmc_host_clk_exit(struct mmc_host *host)
287{
288}
289
290static inline void mmc_host_clk_sysfs_init(struct mmc_host *host)
291{
292}
293
294#endif
295
296/**
297 * mmc_alloc_host - initialise the per-host structure.
298 * @extra: sizeof private data structure
299 * @dev: pointer to host device model structure
300 *
301 * Initialise the per-host structure.
302 */
303struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
304{
305 int err;
306 struct mmc_host *host;
307
308 if (!idr_pre_get(&mmc_host_idr, GFP_KERNEL))
309 return NULL;
310
311 host = kzalloc(sizeof(struct mmc_host) + extra, GFP_KERNEL);
312 if (!host)
313 return NULL;
314
315 spin_lock(&mmc_host_lock);
316 err = idr_get_new(&mmc_host_idr, host, &host->index);
317 spin_unlock(&mmc_host_lock);
318 if (err)
319 goto free;
320
321 dev_set_name(&host->class_dev, "mmc%d", host->index);
322
323 host->parent = dev;
324 host->class_dev.parent = dev;
325 host->class_dev.class = &mmc_host_class;
326 device_initialize(&host->class_dev);
327
328 mmc_host_clk_init(host);
329
330 spin_lock_init(&host->lock);
331 init_waitqueue_head(&host->wq);
332 INIT_DELAYED_WORK(&host->detect, mmc_rescan);
333#ifdef CONFIG_PM
334 host->pm_notify.notifier_call = mmc_pm_notify;
335#endif
336
337 /*
338 * By default, hosts do not support SGIO or large requests.
339 * They have to set these according to their abilities.
340 */
341 host->max_segs = 1;
342 host->max_seg_size = PAGE_CACHE_SIZE;
343
344 host->max_req_size = PAGE_CACHE_SIZE;
345 host->max_blk_size = 512;
346 host->max_blk_count = PAGE_CACHE_SIZE / 512;
347
348 return host;
349
350free:
351 kfree(host);
352 return NULL;
353}
354
355EXPORT_SYMBOL(mmc_alloc_host);
356
357/**
358 * mmc_add_host - initialise host hardware
359 * @host: mmc host
360 *
361 * Register the host with the driver model. The host must be
362 * prepared to start servicing requests before this function
363 * completes.
364 */
365int mmc_add_host(struct mmc_host *host)
366{
367 int err;
368
369 WARN_ON((host->caps & MMC_CAP_SDIO_IRQ) &&
370 !host->ops->enable_sdio_irq);
371
372 err = device_add(&host->class_dev);
373 if (err)
374 return err;
375
376 led_trigger_register_simple(dev_name(&host->class_dev), &host->led);
377
378#ifdef CONFIG_DEBUG_FS
379 mmc_add_host_debugfs(host);
380#endif
381 mmc_host_clk_sysfs_init(host);
382
383 mmc_start_host(host);
384 register_pm_notifier(&host->pm_notify);
385
386 return 0;
387}
388
389EXPORT_SYMBOL(mmc_add_host);
390
391/**
392 * mmc_remove_host - remove host hardware
393 * @host: mmc host
394 *
395 * Unregister and remove all cards associated with this host,
396 * and power down the MMC bus. No new requests will be issued
397 * after this function has returned.
398 */
399void mmc_remove_host(struct mmc_host *host)
400{
401 unregister_pm_notifier(&host->pm_notify);
402 mmc_stop_host(host);
403
404#ifdef CONFIG_DEBUG_FS
405 mmc_remove_host_debugfs(host);
406#endif
407
408 device_del(&host->class_dev);
409
410 led_trigger_unregister_simple(host->led);
411
412 mmc_host_clk_exit(host);
413}
414
415EXPORT_SYMBOL(mmc_remove_host);
416
417/**
418 * mmc_free_host - free the host structure
419 * @host: mmc host
420 *
421 * Free the host once all references to it have been dropped.
422 */
423void mmc_free_host(struct mmc_host *host)
424{
425 spin_lock(&mmc_host_lock);
426 idr_remove(&mmc_host_idr, host->index);
427 spin_unlock(&mmc_host_lock);
428
429 put_device(&host->class_dev);
430}
431
432EXPORT_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);