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Pierre Ossmanb93931a2007-05-19 14:06:24 +02001/*
2 * linux/drivers/mmc/core/host.c
3 *
4 * Copyright (C) 2003 Russell King, All Rights Reserved.
Pierre Ossmanff3112f2008-03-08 23:43:19 +01005 * Copyright (C) 2007-2008 Pierre Ossman
Linus Walleij04566832010-11-08 21:36:50 -05006 * Copyright (C) 2010 Linus Walleij
Pierre Ossmanb93931a2007-05-19 14:06:24 +02007 *
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>
Guennadi Liakhovetski6c56e7a2013-02-16 16:21:16 +010018#include <linux/of.h>
19#include <linux/of_gpio.h>
Pierre Ossmanb93931a2007-05-19 14:06:24 +020020#include <linux/pagemap.h>
Paul Gortmaker3ef77af2011-07-10 12:42:00 -040021#include <linux/export.h>
Pierre Ossmanaf8350c2007-09-24 07:15:48 +020022#include <linux/leds.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090023#include <linux/slab.h>
Maxim Levitsky4c2ef252010-08-10 18:01:41 -070024#include <linux/suspend.h>
Pierre Ossmanb93931a2007-05-19 14:06:24 +020025
26#include <linux/mmc/host.h>
Linus Walleij04566832010-11-08 21:36:50 -050027#include <linux/mmc/card.h>
Guennadi Liakhovetski6c56e7a2013-02-16 16:21:16 +010028#include <linux/mmc/slot-gpio.h>
Pierre Ossmanb93931a2007-05-19 14:06:24 +020029
30#include "core.h"
31#include "host.h"
Ulf Hanssondf8aca12014-12-18 15:44:36 +010032#include "slot-gpio.h"
Ulf Hansson3aa87932014-11-28 14:38:36 +010033#include "pwrseq.h"
Pierre Ossmanb93931a2007-05-19 14:06:24 +020034
35#define cls_dev_to_mmc_host(d) container_of(d, struct mmc_host, class_dev)
36
Ulf Hanssone2d19262014-12-18 15:44:35 +010037static DEFINE_IDR(mmc_host_idr);
38static DEFINE_SPINLOCK(mmc_host_lock);
39
Pierre Ossmanb93931a2007-05-19 14:06:24 +020040static void mmc_host_classdev_release(struct device *dev)
41{
42 struct mmc_host *host = cls_dev_to_mmc_host(dev);
Ulf Hanssone2d19262014-12-18 15:44:35 +010043 spin_lock(&mmc_host_lock);
44 idr_remove(&mmc_host_idr, host->index);
45 spin_unlock(&mmc_host_lock);
Pierre Ossmanb93931a2007-05-19 14:06:24 +020046 kfree(host);
47}
48
49static struct class mmc_host_class = {
50 .name = "mmc_host",
51 .dev_release = mmc_host_classdev_release,
52};
53
54int mmc_register_host_class(void)
55{
56 return class_register(&mmc_host_class);
57}
58
59void mmc_unregister_host_class(void)
60{
61 class_unregister(&mmc_host_class);
62}
63
Linus Walleij04566832010-11-08 21:36:50 -050064#ifdef CONFIG_MMC_CLKGATE
Sujit Reddy Thumma597dd9d792011-11-14 13:53:29 +053065static ssize_t clkgate_delay_show(struct device *dev,
66 struct device_attribute *attr, char *buf)
67{
68 struct mmc_host *host = cls_dev_to_mmc_host(dev);
Stephen Boyd4137e502011-12-05 10:28:44 -080069 return snprintf(buf, PAGE_SIZE, "%lu\n", host->clkgate_delay);
Sujit Reddy Thumma597dd9d792011-11-14 13:53:29 +053070}
71
72static ssize_t clkgate_delay_store(struct device *dev,
73 struct device_attribute *attr, const char *buf, size_t count)
74{
75 struct mmc_host *host = cls_dev_to_mmc_host(dev);
76 unsigned long flags, value;
77
78 if (kstrtoul(buf, 0, &value))
79 return -EINVAL;
80
81 spin_lock_irqsave(&host->clk_lock, flags);
82 host->clkgate_delay = value;
83 spin_unlock_irqrestore(&host->clk_lock, flags);
Sujit Reddy Thumma597dd9d792011-11-14 13:53:29 +053084 return count;
85}
Linus Walleij04566832010-11-08 21:36:50 -050086
87/*
88 * Enabling clock gating will make the core call out to the host
89 * once up and once down when it performs a request or card operation
90 * intermingled in any fashion. The driver will see this through
91 * set_ios() operations with ios.clock field set to 0 to gate (disable)
92 * the block clock, and to the old frequency to enable it again.
93 */
94static void mmc_host_clk_gate_delayed(struct mmc_host *host)
95{
96 unsigned long tick_ns;
97 unsigned long freq = host->ios.clock;
98 unsigned long flags;
99
100 if (!freq) {
101 pr_debug("%s: frequency set to 0 in disable function, "
102 "this means the clock is already disabled.\n",
103 mmc_hostname(host));
104 return;
105 }
106 /*
107 * New requests may have appeared while we were scheduling,
108 * then there is no reason to delay the check before
109 * clk_disable().
110 */
111 spin_lock_irqsave(&host->clk_lock, flags);
112
113 /*
114 * Delay n bus cycles (at least 8 from MMC spec) before attempting
115 * to disable the MCI block clock. The reference count may have
116 * gone up again after this delay due to rescheduling!
117 */
118 if (!host->clk_requests) {
119 spin_unlock_irqrestore(&host->clk_lock, flags);
120 tick_ns = DIV_ROUND_UP(1000000000, freq);
121 ndelay(host->clk_delay * tick_ns);
122 } else {
123 /* New users appeared while waiting for this work */
124 spin_unlock_irqrestore(&host->clk_lock, flags);
125 return;
126 }
Chris Ball86f315b2011-05-16 11:32:26 -0400127 mutex_lock(&host->clk_gate_mutex);
Linus Walleij04566832010-11-08 21:36:50 -0500128 spin_lock_irqsave(&host->clk_lock, flags);
129 if (!host->clk_requests) {
130 spin_unlock_irqrestore(&host->clk_lock, flags);
131 /* This will set host->ios.clock to 0 */
132 mmc_gate_clock(host);
133 spin_lock_irqsave(&host->clk_lock, flags);
134 pr_debug("%s: gated MCI clock\n", mmc_hostname(host));
135 }
136 spin_unlock_irqrestore(&host->clk_lock, flags);
Chris Ball86f315b2011-05-16 11:32:26 -0400137 mutex_unlock(&host->clk_gate_mutex);
Linus Walleij04566832010-11-08 21:36:50 -0500138}
139
140/*
141 * Internal work. Work to disable the clock at some later point.
142 */
143static void mmc_host_clk_gate_work(struct work_struct *work)
144{
145 struct mmc_host *host = container_of(work, struct mmc_host,
Sujit Reddy Thumma597dd9d792011-11-14 13:53:29 +0530146 clk_gate_work.work);
Linus Walleij04566832010-11-08 21:36:50 -0500147
148 mmc_host_clk_gate_delayed(host);
149}
150
151/**
Mika Westerberg08c14072011-08-18 15:23:47 +0300152 * mmc_host_clk_hold - ungate hardware MCI clocks
Linus Walleij04566832010-11-08 21:36:50 -0500153 * @host: host to ungate.
154 *
155 * Makes sure the host ios.clock is restored to a non-zero value
156 * past this call. Increase clock reference count and ungate clock
157 * if we're the first user.
158 */
Mika Westerberg08c14072011-08-18 15:23:47 +0300159void mmc_host_clk_hold(struct mmc_host *host)
Linus Walleij04566832010-11-08 21:36:50 -0500160{
161 unsigned long flags;
162
Sujit Reddy Thumma597dd9d792011-11-14 13:53:29 +0530163 /* cancel any clock gating work scheduled by mmc_host_clk_release() */
164 cancel_delayed_work_sync(&host->clk_gate_work);
Chris Ball86f315b2011-05-16 11:32:26 -0400165 mutex_lock(&host->clk_gate_mutex);
Linus Walleij04566832010-11-08 21:36:50 -0500166 spin_lock_irqsave(&host->clk_lock, flags);
167 if (host->clk_gated) {
168 spin_unlock_irqrestore(&host->clk_lock, flags);
169 mmc_ungate_clock(host);
170 spin_lock_irqsave(&host->clk_lock, flags);
171 pr_debug("%s: ungated MCI clock\n", mmc_hostname(host));
172 }
173 host->clk_requests++;
174 spin_unlock_irqrestore(&host->clk_lock, flags);
Chris Ball86f315b2011-05-16 11:32:26 -0400175 mutex_unlock(&host->clk_gate_mutex);
Linus Walleij04566832010-11-08 21:36:50 -0500176}
177
178/**
179 * mmc_host_may_gate_card - check if this card may be gated
180 * @card: card to check.
181 */
182static bool mmc_host_may_gate_card(struct mmc_card *card)
183{
184 /* If there is no card we may gate it */
185 if (!card)
186 return true;
187 /*
188 * Don't gate SDIO cards! These need to be clocked at all times
189 * since they may be independent systems generating interrupts
190 * and other events. The clock requests counter from the core will
191 * go down to zero since the core does not need it, but we will not
192 * gate the clock, because there is somebody out there that may still
193 * be using it.
194 */
Pierre Tardydb993502011-02-06 19:03:47 +0100195 return !(card->quirks & MMC_QUIRK_BROKEN_CLK_GATING);
Linus Walleij04566832010-11-08 21:36:50 -0500196}
197
198/**
Mika Westerberg08c14072011-08-18 15:23:47 +0300199 * mmc_host_clk_release - gate off hardware MCI clocks
Linus Walleij04566832010-11-08 21:36:50 -0500200 * @host: host to gate.
201 *
202 * Calls the host driver with ios.clock set to zero as often as possible
203 * in order to gate off hardware MCI clocks. Decrease clock reference
204 * count and schedule disabling of clock.
205 */
Mika Westerberg08c14072011-08-18 15:23:47 +0300206void mmc_host_clk_release(struct mmc_host *host)
Linus Walleij04566832010-11-08 21:36:50 -0500207{
208 unsigned long flags;
209
210 spin_lock_irqsave(&host->clk_lock, flags);
211 host->clk_requests--;
212 if (mmc_host_may_gate_card(host->card) &&
213 !host->clk_requests)
Tejun Heo3b07e9c2012-08-20 14:51:24 -0700214 schedule_delayed_work(&host->clk_gate_work,
215 msecs_to_jiffies(host->clkgate_delay));
Linus Walleij04566832010-11-08 21:36:50 -0500216 spin_unlock_irqrestore(&host->clk_lock, flags);
217}
218
219/**
220 * mmc_host_clk_rate - get current clock frequency setting
221 * @host: host to get the clock frequency for.
222 *
223 * Returns current clock frequency regardless of gating.
224 */
225unsigned int mmc_host_clk_rate(struct mmc_host *host)
226{
227 unsigned long freq;
228 unsigned long flags;
229
230 spin_lock_irqsave(&host->clk_lock, flags);
231 if (host->clk_gated)
232 freq = host->clk_old;
233 else
234 freq = host->ios.clock;
235 spin_unlock_irqrestore(&host->clk_lock, flags);
236 return freq;
237}
238
239/**
240 * mmc_host_clk_init - set up clock gating code
241 * @host: host with potential clock to control
242 */
243static inline void mmc_host_clk_init(struct mmc_host *host)
244{
245 host->clk_requests = 0;
246 /* Hold MCI clock for 8 cycles by default */
247 host->clk_delay = 8;
Sujit Reddy Thumma597dd9d792011-11-14 13:53:29 +0530248 /*
Guennadi Liakhovetskic84f15a2012-02-23 11:22:29 +0100249 * Default clock gating delay is 0ms to avoid wasting power.
Sujit Reddy Thumma597dd9d792011-11-14 13:53:29 +0530250 * This value can be tuned by writing into sysfs entry.
251 */
Guennadi Liakhovetskic84f15a2012-02-23 11:22:29 +0100252 host->clkgate_delay = 0;
Linus Walleij04566832010-11-08 21:36:50 -0500253 host->clk_gated = false;
Sujit Reddy Thumma597dd9d792011-11-14 13:53:29 +0530254 INIT_DELAYED_WORK(&host->clk_gate_work, mmc_host_clk_gate_work);
Linus Walleij04566832010-11-08 21:36:50 -0500255 spin_lock_init(&host->clk_lock);
Chris Ball86f315b2011-05-16 11:32:26 -0400256 mutex_init(&host->clk_gate_mutex);
Linus Walleij04566832010-11-08 21:36:50 -0500257}
258
259/**
260 * mmc_host_clk_exit - shut down clock gating code
261 * @host: host with potential clock to control
262 */
263static inline void mmc_host_clk_exit(struct mmc_host *host)
264{
265 /*
266 * Wait for any outstanding gate and then make sure we're
267 * ungated before exiting.
268 */
Sujit Reddy Thumma597dd9d792011-11-14 13:53:29 +0530269 if (cancel_delayed_work_sync(&host->clk_gate_work))
Linus Walleij04566832010-11-08 21:36:50 -0500270 mmc_host_clk_gate_delayed(host);
271 if (host->clk_gated)
Mika Westerberg08c14072011-08-18 15:23:47 +0300272 mmc_host_clk_hold(host);
Linus Walleijc288b852010-12-22 09:50:12 +0100273 /* There should be only one user now */
274 WARN_ON(host->clk_requests > 1);
Linus Walleij04566832010-11-08 21:36:50 -0500275}
276
Sujit Reddy Thumma597dd9d792011-11-14 13:53:29 +0530277static inline void mmc_host_clk_sysfs_init(struct mmc_host *host)
278{
279 host->clkgate_delay_attr.show = clkgate_delay_show;
280 host->clkgate_delay_attr.store = clkgate_delay_store;
281 sysfs_attr_init(&host->clkgate_delay_attr.attr);
282 host->clkgate_delay_attr.attr.name = "clkgate_delay";
283 host->clkgate_delay_attr.attr.mode = S_IRUGO | S_IWUSR;
284 if (device_create_file(&host->class_dev, &host->clkgate_delay_attr))
285 pr_err("%s: Failed to create clkgate_delay sysfs entry\n",
286 mmc_hostname(host));
287}
Linus Walleij04566832010-11-08 21:36:50 -0500288#else
289
290static inline void mmc_host_clk_init(struct mmc_host *host)
291{
292}
293
294static inline void mmc_host_clk_exit(struct mmc_host *host)
295{
296}
297
Sujit Reddy Thumma597dd9d792011-11-14 13:53:29 +0530298static inline void mmc_host_clk_sysfs_init(struct mmc_host *host)
299{
300}
301
Linus Walleij04566832010-11-08 21:36:50 -0500302#endif
303
Adrian Hunterdfa13eb2015-05-07 13:10:12 +0300304void mmc_retune_enable(struct mmc_host *host)
305{
306 host->can_retune = 1;
307 if (host->retune_period)
308 mod_timer(&host->retune_timer,
309 jiffies + host->retune_period * HZ);
310}
311
312void mmc_retune_disable(struct mmc_host *host)
313{
314 host->can_retune = 0;
315 del_timer_sync(&host->retune_timer);
316 host->retune_now = 0;
317 host->need_retune = 0;
318}
319
320void mmc_retune_timer_stop(struct mmc_host *host)
321{
322 del_timer_sync(&host->retune_timer);
323}
324EXPORT_SYMBOL(mmc_retune_timer_stop);
325
326void mmc_retune_hold(struct mmc_host *host)
327{
328 if (!host->hold_retune)
329 host->retune_now = 1;
330 host->hold_retune += 1;
331}
332
333void mmc_retune_release(struct mmc_host *host)
334{
335 if (host->hold_retune)
336 host->hold_retune -= 1;
337 else
338 WARN_ON(1);
339}
340
341int mmc_retune(struct mmc_host *host)
342{
Adrian Hunter6376f692015-05-07 13:10:20 +0300343 bool return_to_hs400 = false;
Adrian Hunterdfa13eb2015-05-07 13:10:12 +0300344 int err;
345
346 if (host->retune_now)
347 host->retune_now = 0;
348 else
349 return 0;
350
351 if (!host->need_retune || host->doing_retune || !host->card)
352 return 0;
353
354 host->need_retune = 0;
355
356 host->doing_retune = 1;
357
Adrian Hunter6376f692015-05-07 13:10:20 +0300358 if (host->ios.timing == MMC_TIMING_MMC_HS400) {
359 err = mmc_hs400_to_hs200(host->card);
360 if (err)
361 goto out;
Adrian Hunterdfa13eb2015-05-07 13:10:12 +0300362
Adrian Hunter6376f692015-05-07 13:10:20 +0300363 return_to_hs400 = true;
364
365 if (host->ops->prepare_hs400_tuning)
366 host->ops->prepare_hs400_tuning(host, &host->ios);
367 }
368
369 err = mmc_execute_tuning(host->card);
370 if (err)
371 goto out;
372
373 if (return_to_hs400)
374 err = mmc_hs200_to_hs400(host->card);
375out:
Adrian Hunterdfa13eb2015-05-07 13:10:12 +0300376 host->doing_retune = 0;
377
378 return err;
379}
380
381static void mmc_retune_timer(unsigned long data)
382{
383 struct mmc_host *host = (struct mmc_host *)data;
384
385 mmc_retune_needed(host);
386}
387
Pierre Ossmanb93931a2007-05-19 14:06:24 +0200388/**
Guennadi Liakhovetski6c56e7a2013-02-16 16:21:16 +0100389 * mmc_of_parse() - parse host's device-tree node
390 * @host: host whose node should be parsed.
391 *
392 * To keep the rest of the MMC subsystem unaware of whether DT has been
393 * used to to instantiate and configure this host instance or not, we
394 * parse the properties and set respective generic mmc-host flags and
395 * parameters.
396 */
Simon Baatzec0a7512013-06-09 22:14:11 +0200397int mmc_of_parse(struct mmc_host *host)
Guennadi Liakhovetski6c56e7a2013-02-16 16:21:16 +0100398{
399 struct device_node *np;
400 u32 bus_width;
Sergei Shtylyov90614cd2015-08-07 01:06:48 +0300401 int ret;
Kristina Martsenkoa31b0c62014-11-05 02:22:41 +0200402 bool cd_cap_invert, cd_gpio_invert = false;
403 bool ro_cap_invert, ro_gpio_invert = false;
Guennadi Liakhovetski6c56e7a2013-02-16 16:21:16 +0100404
405 if (!host->parent || !host->parent->of_node)
Simon Baatzec0a7512013-06-09 22:14:11 +0200406 return 0;
Guennadi Liakhovetski6c56e7a2013-02-16 16:21:16 +0100407
408 np = host->parent->of_node;
409
410 /* "bus-width" is translated to MMC_CAP_*_BIT_DATA flags */
411 if (of_property_read_u32(np, "bus-width", &bus_width) < 0) {
412 dev_dbg(host->parent,
413 "\"bus-width\" property is missing, assuming 1 bit.\n");
414 bus_width = 1;
415 }
416
417 switch (bus_width) {
418 case 8:
419 host->caps |= MMC_CAP_8_BIT_DATA;
420 /* Hosts capable of 8-bit transfers can also do 4 bits */
421 case 4:
422 host->caps |= MMC_CAP_4_BIT_DATA;
423 break;
424 case 1:
425 break;
426 default:
427 dev_err(host->parent,
Alexander Shiyan1c279f42014-02-15 15:40:58 +0400428 "Invalid \"bus-width\" value %u!\n", bus_width);
Simon Baatzec0a7512013-06-09 22:14:11 +0200429 return -EINVAL;
Guennadi Liakhovetski6c56e7a2013-02-16 16:21:16 +0100430 }
431
432 /* f_max is obtained from the optional "max-frequency" property */
433 of_property_read_u32(np, "max-frequency", &host->f_max);
434
435 /*
436 * Configure CD and WP pins. They are both by default active low to
437 * match the SDHCI spec. If GPIOs are provided for CD and / or WP, the
438 * mmc-gpio helpers are used to attach, configure and use them. If
439 * polarity inversion is specified in DT, one of MMC_CAP2_CD_ACTIVE_HIGH
440 * and MMC_CAP2_RO_ACTIVE_HIGH capability-2 flags is set. If the
441 * "broken-cd" property is provided, the MMC_CAP_NEEDS_POLL capability
442 * is set. If the "non-removable" property is found, the
443 * MMC_CAP_NONREMOVABLE capability is set and no card-detection
444 * configuration is performed.
445 */
446
447 /* Parse Card Detection */
Sergei Shtylyov90614cd2015-08-07 01:06:48 +0300448 if (of_property_read_bool(np, "non-removable")) {
Guennadi Liakhovetski6c56e7a2013-02-16 16:21:16 +0100449 host->caps |= MMC_CAP_NONREMOVABLE;
450 } else {
Kristina Martsenkoa31b0c62014-11-05 02:22:41 +0200451 cd_cap_invert = of_property_read_bool(np, "cd-inverted");
Guennadi Liakhovetski6c56e7a2013-02-16 16:21:16 +0100452
Sergei Shtylyov90614cd2015-08-07 01:06:48 +0300453 if (of_property_read_bool(np, "broken-cd"))
Guennadi Liakhovetski6c56e7a2013-02-16 16:21:16 +0100454 host->caps |= MMC_CAP_NEEDS_POLL;
455
Linus Walleij89168b42014-10-02 09:08:46 +0200456 ret = mmc_gpiod_request_cd(host, "cd", 0, true,
Kristina Martsenkoa31b0c62014-11-05 02:22:41 +0200457 0, &cd_gpio_invert);
Ulf Hansson91167522014-12-18 10:41:44 +0100458 if (!ret)
Linus Walleij98e90de2014-08-27 13:00:52 +0200459 dev_info(host->parent, "Got CD GPIO\n");
Ulf Hansson43934ec2015-09-14 12:18:55 +0200460 else if (ret != -ENOENT && ret != -ENOSYS)
Ulf Hansson91167522014-12-18 10:41:44 +0100461 return ret;
Linus Walleij89168b42014-10-02 09:08:46 +0200462
463 /*
464 * There are two ways to flag that the CD line is inverted:
465 * through the cd-inverted flag and by the GPIO line itself
466 * being inverted from the GPIO subsystem. This is a leftover
467 * from the times when the GPIO subsystem did not make it
468 * possible to flag a line as inverted.
469 *
470 * If the capability on the host AND the GPIO line are
471 * both inverted, the end result is that the CD line is
472 * not inverted.
473 */
Kristina Martsenkoa31b0c62014-11-05 02:22:41 +0200474 if (cd_cap_invert ^ cd_gpio_invert)
Linus Walleij89168b42014-10-02 09:08:46 +0200475 host->caps2 |= MMC_CAP2_CD_ACTIVE_HIGH;
Guennadi Liakhovetski6c56e7a2013-02-16 16:21:16 +0100476 }
477
478 /* Parse Write Protection */
Kristina Martsenkoa31b0c62014-11-05 02:22:41 +0200479 ro_cap_invert = of_property_read_bool(np, "wp-inverted");
Guennadi Liakhovetski2fdb6e22013-02-15 16:14:01 +0100480
Kristina Martsenkoa31b0c62014-11-05 02:22:41 +0200481 ret = mmc_gpiod_request_ro(host, "wp", 0, false, 0, &ro_gpio_invert);
Ulf Hansson91167522014-12-18 10:41:44 +0100482 if (!ret)
Linus Walleij98e90de2014-08-27 13:00:52 +0200483 dev_info(host->parent, "Got WP GPIO\n");
Ulf Hansson43934ec2015-09-14 12:18:55 +0200484 else if (ret != -ENOENT && ret != -ENOSYS)
Ulf Hansson91167522014-12-18 10:41:44 +0100485 return ret;
Linus Walleij98e90de2014-08-27 13:00:52 +0200486
Lars-Peter Clausen19f44242015-05-06 20:31:20 +0200487 if (of_property_read_bool(np, "disable-wp"))
488 host->caps2 |= MMC_CAP2_NO_WRITE_PROTECT;
489
Linus Walleij89168b42014-10-02 09:08:46 +0200490 /* See the comment on CD inversion above */
Kristina Martsenkoa31b0c62014-11-05 02:22:41 +0200491 if (ro_cap_invert ^ ro_gpio_invert)
Linus Walleij89168b42014-10-02 09:08:46 +0200492 host->caps2 |= MMC_CAP2_RO_ACTIVE_HIGH;
493
Sergei Shtylyov90614cd2015-08-07 01:06:48 +0300494 if (of_property_read_bool(np, "cap-sd-highspeed"))
Guennadi Liakhovetski2fdb6e22013-02-15 16:14:01 +0100495 host->caps |= MMC_CAP_SD_HIGHSPEED;
Sergei Shtylyov90614cd2015-08-07 01:06:48 +0300496 if (of_property_read_bool(np, "cap-mmc-highspeed"))
Guennadi Liakhovetski2fdb6e22013-02-15 16:14:01 +0100497 host->caps |= MMC_CAP_MMC_HIGHSPEED;
Sergei Shtylyov90614cd2015-08-07 01:06:48 +0300498 if (of_property_read_bool(np, "sd-uhs-sdr12"))
Ulf Hanssonb66bd0e2014-02-14 13:27:07 +0100499 host->caps |= MMC_CAP_UHS_SDR12;
Sergei Shtylyov90614cd2015-08-07 01:06:48 +0300500 if (of_property_read_bool(np, "sd-uhs-sdr25"))
Ulf Hanssonb66bd0e2014-02-14 13:27:07 +0100501 host->caps |= MMC_CAP_UHS_SDR25;
Sergei Shtylyov90614cd2015-08-07 01:06:48 +0300502 if (of_property_read_bool(np, "sd-uhs-sdr50"))
Ulf Hanssonb66bd0e2014-02-14 13:27:07 +0100503 host->caps |= MMC_CAP_UHS_SDR50;
Sergei Shtylyov90614cd2015-08-07 01:06:48 +0300504 if (of_property_read_bool(np, "sd-uhs-sdr104"))
Ulf Hanssonb66bd0e2014-02-14 13:27:07 +0100505 host->caps |= MMC_CAP_UHS_SDR104;
Sergei Shtylyov90614cd2015-08-07 01:06:48 +0300506 if (of_property_read_bool(np, "sd-uhs-ddr50"))
Ulf Hanssonb66bd0e2014-02-14 13:27:07 +0100507 host->caps |= MMC_CAP_UHS_DDR50;
Sergei Shtylyov90614cd2015-08-07 01:06:48 +0300508 if (of_property_read_bool(np, "cap-power-off-card"))
Guennadi Liakhovetski2fdb6e22013-02-15 16:14:01 +0100509 host->caps |= MMC_CAP_POWER_OFF_CARD;
Sergei Shtylyov90614cd2015-08-07 01:06:48 +0300510 if (of_property_read_bool(np, "cap-sdio-irq"))
Guennadi Liakhovetski2fdb6e22013-02-15 16:14:01 +0100511 host->caps |= MMC_CAP_SDIO_IRQ;
Sergei Shtylyov90614cd2015-08-07 01:06:48 +0300512 if (of_property_read_bool(np, "full-pwr-cycle"))
Ulf Hansson5a36d6b2013-06-10 17:03:47 +0200513 host->caps2 |= MMC_CAP2_FULL_PWR_CYCLE;
Sergei Shtylyov90614cd2015-08-07 01:06:48 +0300514 if (of_property_read_bool(np, "keep-power-in-suspend"))
Guennadi Liakhovetski2fdb6e22013-02-15 16:14:01 +0100515 host->pm_caps |= MMC_PM_KEEP_POWER;
Sergei Shtylyov90614cd2015-08-07 01:06:48 +0300516 if (of_property_read_bool(np, "enable-sdio-wakeup"))
Guennadi Liakhovetski2fdb6e22013-02-15 16:14:01 +0100517 host->pm_caps |= MMC_PM_WAKE_SDIO_IRQ;
Sergei Shtylyov90614cd2015-08-07 01:06:48 +0300518 if (of_property_read_bool(np, "mmc-ddr-1_8v"))
Ulf Hanssonc0baf842014-02-14 13:27:08 +0100519 host->caps |= MMC_CAP_1_8V_DDR;
Sergei Shtylyov90614cd2015-08-07 01:06:48 +0300520 if (of_property_read_bool(np, "mmc-ddr-1_2v"))
Ulf Hanssonc0baf842014-02-14 13:27:08 +0100521 host->caps |= MMC_CAP_1_2V_DDR;
Sergei Shtylyov90614cd2015-08-07 01:06:48 +0300522 if (of_property_read_bool(np, "mmc-hs200-1_8v"))
Jaehoon Chung321bd412014-02-14 13:27:09 +0100523 host->caps2 |= MMC_CAP2_HS200_1_8V_SDR;
Sergei Shtylyov90614cd2015-08-07 01:06:48 +0300524 if (of_property_read_bool(np, "mmc-hs200-1_2v"))
Jaehoon Chung321bd412014-02-14 13:27:09 +0100525 host->caps2 |= MMC_CAP2_HS200_1_2V_SDR;
Sergei Shtylyov90614cd2015-08-07 01:06:48 +0300526 if (of_property_read_bool(np, "mmc-hs400-1_8v"))
Seungwon Jeonc373eb42014-04-23 17:15:08 +0900527 host->caps2 |= MMC_CAP2_HS400_1_8V | MMC_CAP2_HS200_1_8V_SDR;
Sergei Shtylyov90614cd2015-08-07 01:06:48 +0300528 if (of_property_read_bool(np, "mmc-hs400-1_2v"))
Seungwon Jeonc373eb42014-04-23 17:15:08 +0900529 host->caps2 |= MMC_CAP2_HS400_1_2V | MMC_CAP2_HS200_1_2V_SDR;
Simon Baatzec0a7512013-06-09 22:14:11 +0200530
Sascha Hauer3d705d12014-08-19 10:45:51 +0200531 host->dsr_req = !of_property_read_u32(np, "dsr", &host->dsr);
532 if (host->dsr_req && (host->dsr & ~0xffff)) {
533 dev_err(host->parent,
534 "device tree specified broken value for DSR: 0x%x, ignoring\n",
535 host->dsr);
536 host->dsr_req = 0;
537 }
538
Ulf Hansson3aa87932014-11-28 14:38:36 +0100539 return mmc_pwrseq_alloc(host);
Guennadi Liakhovetski6c56e7a2013-02-16 16:21:16 +0100540}
541
542EXPORT_SYMBOL(mmc_of_parse);
543
544/**
Pierre Ossmanb93931a2007-05-19 14:06:24 +0200545 * mmc_alloc_host - initialise the per-host structure.
546 * @extra: sizeof private data structure
547 * @dev: pointer to host device model structure
548 *
549 * Initialise the per-host structure.
550 */
551struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
552{
Pierre Ossmanff3112f2008-03-08 23:43:19 +0100553 int err;
Pierre Ossmanb93931a2007-05-19 14:06:24 +0200554 struct mmc_host *host;
555
Mariusz Kozlowskibe760a92007-08-10 14:00:50 -0700556 host = kzalloc(sizeof(struct mmc_host) + extra, GFP_KERNEL);
Pierre Ossmanb93931a2007-05-19 14:06:24 +0200557 if (!host)
558 return NULL;
559
Guennadi Liakhovetskid9adcc12012-06-14 10:17:39 +0200560 /* scanning will be enabled when we're ready */
561 host->rescan_disable = 1;
Tejun Heo803d9e02013-02-27 17:04:32 -0800562 idr_preload(GFP_KERNEL);
Pierre Ossmanff3112f2008-03-08 23:43:19 +0100563 spin_lock(&mmc_host_lock);
Tejun Heo803d9e02013-02-27 17:04:32 -0800564 err = idr_alloc(&mmc_host_idr, host, 0, 0, GFP_NOWAIT);
565 if (err >= 0)
566 host->index = err;
Pierre Ossmanff3112f2008-03-08 23:43:19 +0100567 spin_unlock(&mmc_host_lock);
Tejun Heo803d9e02013-02-27 17:04:32 -0800568 idr_preload_end();
Ulf Hanssondf8aca12014-12-18 15:44:36 +0100569 if (err < 0) {
570 kfree(host);
571 return NULL;
572 }
Pierre Ossmanff3112f2008-03-08 23:43:19 +0100573
Kay Sieversd1b26862008-11-08 21:37:46 +0100574 dev_set_name(&host->class_dev, "mmc%d", host->index);
Pierre Ossmanff3112f2008-03-08 23:43:19 +0100575
Pierre Ossmanb93931a2007-05-19 14:06:24 +0200576 host->parent = dev;
577 host->class_dev.parent = dev;
578 host->class_dev.class = &mmc_host_class;
579 device_initialize(&host->class_dev);
580
Ulf Hanssondf8aca12014-12-18 15:44:36 +0100581 if (mmc_gpio_alloc(host)) {
582 put_device(&host->class_dev);
583 return NULL;
584 }
Linus Walleij04566832010-11-08 21:36:50 -0500585
Ulf Hanssondf8aca12014-12-18 15:44:36 +0100586 mmc_host_clk_init(host);
Guennadi Liakhovetski27410ee2012-05-01 15:40:15 +0200587
Pierre Ossmanb93931a2007-05-19 14:06:24 +0200588 spin_lock_init(&host->lock);
589 init_waitqueue_head(&host->wq);
590 INIT_DELAYED_WORK(&host->detect, mmc_rescan);
Uwe Kleine-König81ca03a2010-08-18 09:25:38 -0700591#ifdef CONFIG_PM
Maxim Levitsky4c2ef252010-08-10 18:01:41 -0700592 host->pm_notify.notifier_call = mmc_pm_notify;
Uwe Kleine-König81ca03a2010-08-18 09:25:38 -0700593#endif
Adrian Hunterdfa13eb2015-05-07 13:10:12 +0300594 setup_timer(&host->retune_timer, mmc_retune_timer, (unsigned long)host);
Pierre Ossmanb93931a2007-05-19 14:06:24 +0200595
596 /*
597 * By default, hosts do not support SGIO or large requests.
598 * They have to set these according to their abilities.
599 */
Martin K. Petersena36274e2010-09-10 01:33:59 -0400600 host->max_segs = 1;
Pierre Ossmanb93931a2007-05-19 14:06:24 +0200601 host->max_seg_size = PAGE_CACHE_SIZE;
602
603 host->max_req_size = PAGE_CACHE_SIZE;
604 host->max_blk_size = 512;
605 host->max_blk_count = PAGE_CACHE_SIZE / 512;
606
607 return host;
608}
609
610EXPORT_SYMBOL(mmc_alloc_host);
611
612/**
613 * mmc_add_host - initialise host hardware
614 * @host: mmc host
Pierre Ossman67a61c42007-07-11 20:22:11 +0200615 *
616 * Register the host with the driver model. The host must be
617 * prepared to start servicing requests before this function
618 * completes.
Pierre Ossmanb93931a2007-05-19 14:06:24 +0200619 */
620int mmc_add_host(struct mmc_host *host)
621{
622 int err;
623
Nicolas Pitre17b759a2007-07-24 02:09:39 -0400624 WARN_ON((host->caps & MMC_CAP_SDIO_IRQ) &&
625 !host->ops->enable_sdio_irq);
626
Pierre Ossmanb93931a2007-05-19 14:06:24 +0200627 err = device_add(&host->class_dev);
628 if (err)
629 return err;
630
Wolfram Sangf317dfe2011-04-11 06:11:29 +0200631 led_trigger_register_simple(dev_name(&host->class_dev), &host->led);
632
Haavard Skinnemoen6edd8ee2008-07-24 14:18:57 +0200633#ifdef CONFIG_DEBUG_FS
634 mmc_add_host_debugfs(host);
635#endif
Sujit Reddy Thumma597dd9d792011-11-14 13:53:29 +0530636 mmc_host_clk_sysfs_init(host);
Haavard Skinnemoen6edd8ee2008-07-24 14:18:57 +0200637
Pierre Ossmanb93931a2007-05-19 14:06:24 +0200638 mmc_start_host(host);
Maxim Levitsky4c2ef252010-08-10 18:01:41 -0700639 register_pm_notifier(&host->pm_notify);
Pierre Ossmanb93931a2007-05-19 14:06:24 +0200640
641 return 0;
642}
643
644EXPORT_SYMBOL(mmc_add_host);
645
646/**
647 * mmc_remove_host - remove host hardware
648 * @host: mmc host
649 *
650 * Unregister and remove all cards associated with this host,
Pierre Ossman67a61c42007-07-11 20:22:11 +0200651 * and power down the MMC bus. No new requests will be issued
652 * after this function has returned.
Pierre Ossmanb93931a2007-05-19 14:06:24 +0200653 */
654void mmc_remove_host(struct mmc_host *host)
655{
Maxim Levitsky4c2ef252010-08-10 18:01:41 -0700656 unregister_pm_notifier(&host->pm_notify);
Pierre Ossmanb93931a2007-05-19 14:06:24 +0200657 mmc_stop_host(host);
658
Haavard Skinnemoen6edd8ee2008-07-24 14:18:57 +0200659#ifdef CONFIG_DEBUG_FS
660 mmc_remove_host_debugfs(host);
661#endif
662
Pierre Ossmanb93931a2007-05-19 14:06:24 +0200663 device_del(&host->class_dev);
664
Pierre Ossman77f1fd62007-10-12 22:48:46 +0200665 led_trigger_unregister_simple(host->led);
Linus Walleij04566832010-11-08 21:36:50 -0500666
667 mmc_host_clk_exit(host);
Pierre Ossmanb93931a2007-05-19 14:06:24 +0200668}
669
670EXPORT_SYMBOL(mmc_remove_host);
671
672/**
673 * mmc_free_host - free the host structure
674 * @host: mmc host
675 *
676 * Free the host once all references to it have been dropped.
677 */
678void mmc_free_host(struct mmc_host *host)
679{
Ulf Hansson3aa87932014-11-28 14:38:36 +0100680 mmc_pwrseq_free(host);
Pierre Ossmanb93931a2007-05-19 14:06:24 +0200681 put_device(&host->class_dev);
682}
683
684EXPORT_SYMBOL(mmc_free_host);