blob: 45c2daea71ab0c6ad97548ee685d1214eb30e11a [file] [log] [blame]
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"
32
33#define cls_dev_to_mmc_host(d) container_of(d, struct mmc_host, class_dev)
34
35static void mmc_host_classdev_release(struct device *dev)
36{
37 struct mmc_host *host = cls_dev_to_mmc_host(dev);
Guennadi Liakhovetskia7d1a1e2012-05-01 16:51:38 +020038 mutex_destroy(&host->slot.lock);
Pierre Ossmanb93931a2007-05-19 14:06:24 +020039 kfree(host);
40}
41
42static struct class mmc_host_class = {
43 .name = "mmc_host",
44 .dev_release = mmc_host_classdev_release,
45};
46
47int mmc_register_host_class(void)
48{
49 return class_register(&mmc_host_class);
50}
51
52void mmc_unregister_host_class(void)
53{
54 class_unregister(&mmc_host_class);
55}
56
57static DEFINE_IDR(mmc_host_idr);
58static DEFINE_SPINLOCK(mmc_host_lock);
59
Linus Walleij04566832010-11-08 21:36:50 -050060#ifdef CONFIG_MMC_CLKGATE
Sujit Reddy Thumma597dd9d792011-11-14 13:53:29 +053061static ssize_t clkgate_delay_show(struct device *dev,
62 struct device_attribute *attr, char *buf)
63{
64 struct mmc_host *host = cls_dev_to_mmc_host(dev);
Stephen Boyd4137e502011-12-05 10:28:44 -080065 return snprintf(buf, PAGE_SIZE, "%lu\n", host->clkgate_delay);
Sujit Reddy Thumma597dd9d792011-11-14 13:53:29 +053066}
67
68static ssize_t clkgate_delay_store(struct device *dev,
69 struct device_attribute *attr, const char *buf, size_t count)
70{
71 struct mmc_host *host = cls_dev_to_mmc_host(dev);
72 unsigned long flags, value;
73
74 if (kstrtoul(buf, 0, &value))
75 return -EINVAL;
76
77 spin_lock_irqsave(&host->clk_lock, flags);
78 host->clkgate_delay = value;
79 spin_unlock_irqrestore(&host->clk_lock, flags);
Sujit Reddy Thumma597dd9d792011-11-14 13:53:29 +053080 return count;
81}
Linus Walleij04566832010-11-08 21:36:50 -050082
83/*
84 * Enabling clock gating will make the core call out to the host
85 * once up and once down when it performs a request or card operation
86 * intermingled in any fashion. The driver will see this through
87 * set_ios() operations with ios.clock field set to 0 to gate (disable)
88 * the block clock, and to the old frequency to enable it again.
89 */
90static void mmc_host_clk_gate_delayed(struct mmc_host *host)
91{
92 unsigned long tick_ns;
93 unsigned long freq = host->ios.clock;
94 unsigned long flags;
95
96 if (!freq) {
97 pr_debug("%s: frequency set to 0 in disable function, "
98 "this means the clock is already disabled.\n",
99 mmc_hostname(host));
100 return;
101 }
102 /*
103 * New requests may have appeared while we were scheduling,
104 * then there is no reason to delay the check before
105 * clk_disable().
106 */
107 spin_lock_irqsave(&host->clk_lock, flags);
108
109 /*
110 * Delay n bus cycles (at least 8 from MMC spec) before attempting
111 * to disable the MCI block clock. The reference count may have
112 * gone up again after this delay due to rescheduling!
113 */
114 if (!host->clk_requests) {
115 spin_unlock_irqrestore(&host->clk_lock, flags);
116 tick_ns = DIV_ROUND_UP(1000000000, freq);
117 ndelay(host->clk_delay * tick_ns);
118 } else {
119 /* New users appeared while waiting for this work */
120 spin_unlock_irqrestore(&host->clk_lock, flags);
121 return;
122 }
Chris Ball86f315b2011-05-16 11:32:26 -0400123 mutex_lock(&host->clk_gate_mutex);
Linus Walleij04566832010-11-08 21:36:50 -0500124 spin_lock_irqsave(&host->clk_lock, flags);
125 if (!host->clk_requests) {
126 spin_unlock_irqrestore(&host->clk_lock, flags);
127 /* This will set host->ios.clock to 0 */
128 mmc_gate_clock(host);
129 spin_lock_irqsave(&host->clk_lock, flags);
130 pr_debug("%s: gated MCI clock\n", mmc_hostname(host));
131 }
132 spin_unlock_irqrestore(&host->clk_lock, flags);
Chris Ball86f315b2011-05-16 11:32:26 -0400133 mutex_unlock(&host->clk_gate_mutex);
Linus Walleij04566832010-11-08 21:36:50 -0500134}
135
136/*
137 * Internal work. Work to disable the clock at some later point.
138 */
139static void mmc_host_clk_gate_work(struct work_struct *work)
140{
141 struct mmc_host *host = container_of(work, struct mmc_host,
Sujit Reddy Thumma597dd9d792011-11-14 13:53:29 +0530142 clk_gate_work.work);
Linus Walleij04566832010-11-08 21:36:50 -0500143
144 mmc_host_clk_gate_delayed(host);
145}
146
147/**
Mika Westerberg08c14072011-08-18 15:23:47 +0300148 * mmc_host_clk_hold - ungate hardware MCI clocks
Linus Walleij04566832010-11-08 21:36:50 -0500149 * @host: host to ungate.
150 *
151 * Makes sure the host ios.clock is restored to a non-zero value
152 * past this call. Increase clock reference count and ungate clock
153 * if we're the first user.
154 */
Mika Westerberg08c14072011-08-18 15:23:47 +0300155void mmc_host_clk_hold(struct mmc_host *host)
Linus Walleij04566832010-11-08 21:36:50 -0500156{
157 unsigned long flags;
158
Sujit Reddy Thumma597dd9d792011-11-14 13:53:29 +0530159 /* cancel any clock gating work scheduled by mmc_host_clk_release() */
160 cancel_delayed_work_sync(&host->clk_gate_work);
Chris Ball86f315b2011-05-16 11:32:26 -0400161 mutex_lock(&host->clk_gate_mutex);
Linus Walleij04566832010-11-08 21:36:50 -0500162 spin_lock_irqsave(&host->clk_lock, flags);
163 if (host->clk_gated) {
164 spin_unlock_irqrestore(&host->clk_lock, flags);
165 mmc_ungate_clock(host);
166 spin_lock_irqsave(&host->clk_lock, flags);
167 pr_debug("%s: ungated MCI clock\n", mmc_hostname(host));
168 }
169 host->clk_requests++;
170 spin_unlock_irqrestore(&host->clk_lock, flags);
Chris Ball86f315b2011-05-16 11:32:26 -0400171 mutex_unlock(&host->clk_gate_mutex);
Linus Walleij04566832010-11-08 21:36:50 -0500172}
173
174/**
175 * mmc_host_may_gate_card - check if this card may be gated
176 * @card: card to check.
177 */
178static bool mmc_host_may_gate_card(struct mmc_card *card)
179{
180 /* If there is no card we may gate it */
181 if (!card)
182 return true;
183 /*
184 * Don't gate SDIO cards! These need to be clocked at all times
185 * since they may be independent systems generating interrupts
186 * and other events. The clock requests counter from the core will
187 * go down to zero since the core does not need it, but we will not
188 * gate the clock, because there is somebody out there that may still
189 * be using it.
190 */
Pierre Tardydb993502011-02-06 19:03:47 +0100191 return !(card->quirks & MMC_QUIRK_BROKEN_CLK_GATING);
Linus Walleij04566832010-11-08 21:36:50 -0500192}
193
194/**
Mika Westerberg08c14072011-08-18 15:23:47 +0300195 * mmc_host_clk_release - gate off hardware MCI clocks
Linus Walleij04566832010-11-08 21:36:50 -0500196 * @host: host to gate.
197 *
198 * Calls the host driver with ios.clock set to zero as often as possible
199 * in order to gate off hardware MCI clocks. Decrease clock reference
200 * count and schedule disabling of clock.
201 */
Mika Westerberg08c14072011-08-18 15:23:47 +0300202void mmc_host_clk_release(struct mmc_host *host)
Linus Walleij04566832010-11-08 21:36:50 -0500203{
204 unsigned long flags;
205
206 spin_lock_irqsave(&host->clk_lock, flags);
207 host->clk_requests--;
208 if (mmc_host_may_gate_card(host->card) &&
209 !host->clk_requests)
Tejun Heo3b07e9c2012-08-20 14:51:24 -0700210 schedule_delayed_work(&host->clk_gate_work,
211 msecs_to_jiffies(host->clkgate_delay));
Linus Walleij04566832010-11-08 21:36:50 -0500212 spin_unlock_irqrestore(&host->clk_lock, flags);
213}
214
215/**
216 * mmc_host_clk_rate - get current clock frequency setting
217 * @host: host to get the clock frequency for.
218 *
219 * Returns current clock frequency regardless of gating.
220 */
221unsigned int mmc_host_clk_rate(struct mmc_host *host)
222{
223 unsigned long freq;
224 unsigned long flags;
225
226 spin_lock_irqsave(&host->clk_lock, flags);
227 if (host->clk_gated)
228 freq = host->clk_old;
229 else
230 freq = host->ios.clock;
231 spin_unlock_irqrestore(&host->clk_lock, flags);
232 return freq;
233}
234
235/**
236 * mmc_host_clk_init - set up clock gating code
237 * @host: host with potential clock to control
238 */
239static inline void mmc_host_clk_init(struct mmc_host *host)
240{
241 host->clk_requests = 0;
242 /* Hold MCI clock for 8 cycles by default */
243 host->clk_delay = 8;
Sujit Reddy Thumma597dd9d792011-11-14 13:53:29 +0530244 /*
Guennadi Liakhovetskic84f15a2012-02-23 11:22:29 +0100245 * Default clock gating delay is 0ms to avoid wasting power.
Sujit Reddy Thumma597dd9d792011-11-14 13:53:29 +0530246 * This value can be tuned by writing into sysfs entry.
247 */
Guennadi Liakhovetskic84f15a2012-02-23 11:22:29 +0100248 host->clkgate_delay = 0;
Linus Walleij04566832010-11-08 21:36:50 -0500249 host->clk_gated = false;
Sujit Reddy Thumma597dd9d792011-11-14 13:53:29 +0530250 INIT_DELAYED_WORK(&host->clk_gate_work, mmc_host_clk_gate_work);
Linus Walleij04566832010-11-08 21:36:50 -0500251 spin_lock_init(&host->clk_lock);
Chris Ball86f315b2011-05-16 11:32:26 -0400252 mutex_init(&host->clk_gate_mutex);
Linus Walleij04566832010-11-08 21:36:50 -0500253}
254
255/**
256 * mmc_host_clk_exit - shut down clock gating code
257 * @host: host with potential clock to control
258 */
259static inline void mmc_host_clk_exit(struct mmc_host *host)
260{
261 /*
262 * Wait for any outstanding gate and then make sure we're
263 * ungated before exiting.
264 */
Sujit Reddy Thumma597dd9d792011-11-14 13:53:29 +0530265 if (cancel_delayed_work_sync(&host->clk_gate_work))
Linus Walleij04566832010-11-08 21:36:50 -0500266 mmc_host_clk_gate_delayed(host);
267 if (host->clk_gated)
Mika Westerberg08c14072011-08-18 15:23:47 +0300268 mmc_host_clk_hold(host);
Linus Walleijc288b852010-12-22 09:50:12 +0100269 /* There should be only one user now */
270 WARN_ON(host->clk_requests > 1);
Linus Walleij04566832010-11-08 21:36:50 -0500271}
272
Sujit Reddy Thumma597dd9d792011-11-14 13:53:29 +0530273static inline void mmc_host_clk_sysfs_init(struct mmc_host *host)
274{
275 host->clkgate_delay_attr.show = clkgate_delay_show;
276 host->clkgate_delay_attr.store = clkgate_delay_store;
277 sysfs_attr_init(&host->clkgate_delay_attr.attr);
278 host->clkgate_delay_attr.attr.name = "clkgate_delay";
279 host->clkgate_delay_attr.attr.mode = S_IRUGO | S_IWUSR;
280 if (device_create_file(&host->class_dev, &host->clkgate_delay_attr))
281 pr_err("%s: Failed to create clkgate_delay sysfs entry\n",
282 mmc_hostname(host));
283}
Linus Walleij04566832010-11-08 21:36:50 -0500284#else
285
286static inline void mmc_host_clk_init(struct mmc_host *host)
287{
288}
289
290static inline void mmc_host_clk_exit(struct mmc_host *host)
291{
292}
293
Sujit Reddy Thumma597dd9d792011-11-14 13:53:29 +0530294static inline void mmc_host_clk_sysfs_init(struct mmc_host *host)
295{
296}
297
Linus Walleij04566832010-11-08 21:36:50 -0500298#endif
299
Pierre Ossmanb93931a2007-05-19 14:06:24 +0200300/**
Guennadi Liakhovetski6c56e7a2013-02-16 16:21:16 +0100301 * mmc_of_parse() - parse host's device-tree node
302 * @host: host whose node should be parsed.
303 *
304 * To keep the rest of the MMC subsystem unaware of whether DT has been
305 * used to to instantiate and configure this host instance or not, we
306 * parse the properties and set respective generic mmc-host flags and
307 * parameters.
308 */
Simon Baatzec0a7512013-06-09 22:14:11 +0200309int mmc_of_parse(struct mmc_host *host)
Guennadi Liakhovetski6c56e7a2013-02-16 16:21:16 +0100310{
311 struct device_node *np;
312 u32 bus_width;
Linus Walleij98e90de2014-08-27 13:00:52 +0200313 int len, ret;
Kristina Martsenkoa31b0c62014-11-05 02:22:41 +0200314 bool cd_cap_invert, cd_gpio_invert = false;
315 bool ro_cap_invert, ro_gpio_invert = false;
Guennadi Liakhovetski6c56e7a2013-02-16 16:21:16 +0100316
317 if (!host->parent || !host->parent->of_node)
Simon Baatzec0a7512013-06-09 22:14:11 +0200318 return 0;
Guennadi Liakhovetski6c56e7a2013-02-16 16:21:16 +0100319
320 np = host->parent->of_node;
321
322 /* "bus-width" is translated to MMC_CAP_*_BIT_DATA flags */
323 if (of_property_read_u32(np, "bus-width", &bus_width) < 0) {
324 dev_dbg(host->parent,
325 "\"bus-width\" property is missing, assuming 1 bit.\n");
326 bus_width = 1;
327 }
328
329 switch (bus_width) {
330 case 8:
331 host->caps |= MMC_CAP_8_BIT_DATA;
332 /* Hosts capable of 8-bit transfers can also do 4 bits */
333 case 4:
334 host->caps |= MMC_CAP_4_BIT_DATA;
335 break;
336 case 1:
337 break;
338 default:
339 dev_err(host->parent,
Alexander Shiyan1c279f42014-02-15 15:40:58 +0400340 "Invalid \"bus-width\" value %u!\n", bus_width);
Simon Baatzec0a7512013-06-09 22:14:11 +0200341 return -EINVAL;
Guennadi Liakhovetski6c56e7a2013-02-16 16:21:16 +0100342 }
343
344 /* f_max is obtained from the optional "max-frequency" property */
345 of_property_read_u32(np, "max-frequency", &host->f_max);
346
347 /*
348 * Configure CD and WP pins. They are both by default active low to
349 * match the SDHCI spec. If GPIOs are provided for CD and / or WP, the
350 * mmc-gpio helpers are used to attach, configure and use them. If
351 * polarity inversion is specified in DT, one of MMC_CAP2_CD_ACTIVE_HIGH
352 * and MMC_CAP2_RO_ACTIVE_HIGH capability-2 flags is set. If the
353 * "broken-cd" property is provided, the MMC_CAP_NEEDS_POLL capability
354 * is set. If the "non-removable" property is found, the
355 * MMC_CAP_NONREMOVABLE capability is set and no card-detection
356 * configuration is performed.
357 */
358
359 /* Parse Card Detection */
360 if (of_find_property(np, "non-removable", &len)) {
361 host->caps |= MMC_CAP_NONREMOVABLE;
362 } else {
Kristina Martsenkoa31b0c62014-11-05 02:22:41 +0200363 cd_cap_invert = of_property_read_bool(np, "cd-inverted");
Guennadi Liakhovetski6c56e7a2013-02-16 16:21:16 +0100364
365 if (of_find_property(np, "broken-cd", &len))
366 host->caps |= MMC_CAP_NEEDS_POLL;
367
Linus Walleij89168b42014-10-02 09:08:46 +0200368 ret = mmc_gpiod_request_cd(host, "cd", 0, true,
Kristina Martsenkoa31b0c62014-11-05 02:22:41 +0200369 0, &cd_gpio_invert);
Ulf Hansson91167522014-12-18 10:41:44 +0100370 if (!ret)
Linus Walleij98e90de2014-08-27 13:00:52 +0200371 dev_info(host->parent, "Got CD GPIO\n");
Ulf Hansson91167522014-12-18 10:41:44 +0100372 else if (ret != -ENOENT)
373 return ret;
Linus Walleij89168b42014-10-02 09:08:46 +0200374
375 /*
376 * There are two ways to flag that the CD line is inverted:
377 * through the cd-inverted flag and by the GPIO line itself
378 * being inverted from the GPIO subsystem. This is a leftover
379 * from the times when the GPIO subsystem did not make it
380 * possible to flag a line as inverted.
381 *
382 * If the capability on the host AND the GPIO line are
383 * both inverted, the end result is that the CD line is
384 * not inverted.
385 */
Kristina Martsenkoa31b0c62014-11-05 02:22:41 +0200386 if (cd_cap_invert ^ cd_gpio_invert)
Linus Walleij89168b42014-10-02 09:08:46 +0200387 host->caps2 |= MMC_CAP2_CD_ACTIVE_HIGH;
Guennadi Liakhovetski6c56e7a2013-02-16 16:21:16 +0100388 }
389
390 /* Parse Write Protection */
Kristina Martsenkoa31b0c62014-11-05 02:22:41 +0200391 ro_cap_invert = of_property_read_bool(np, "wp-inverted");
Guennadi Liakhovetski2fdb6e22013-02-15 16:14:01 +0100392
Kristina Martsenkoa31b0c62014-11-05 02:22:41 +0200393 ret = mmc_gpiod_request_ro(host, "wp", 0, false, 0, &ro_gpio_invert);
Ulf Hansson91167522014-12-18 10:41:44 +0100394 if (!ret)
Linus Walleij98e90de2014-08-27 13:00:52 +0200395 dev_info(host->parent, "Got WP GPIO\n");
Ulf Hansson91167522014-12-18 10:41:44 +0100396 else if (ret != -ENOENT)
397 return ret;
Linus Walleij98e90de2014-08-27 13:00:52 +0200398
Linus Walleij89168b42014-10-02 09:08:46 +0200399 /* See the comment on CD inversion above */
Kristina Martsenkoa31b0c62014-11-05 02:22:41 +0200400 if (ro_cap_invert ^ ro_gpio_invert)
Linus Walleij89168b42014-10-02 09:08:46 +0200401 host->caps2 |= MMC_CAP2_RO_ACTIVE_HIGH;
402
Guennadi Liakhovetski2fdb6e22013-02-15 16:14:01 +0100403 if (of_find_property(np, "cap-sd-highspeed", &len))
404 host->caps |= MMC_CAP_SD_HIGHSPEED;
405 if (of_find_property(np, "cap-mmc-highspeed", &len))
406 host->caps |= MMC_CAP_MMC_HIGHSPEED;
Ulf Hanssonb66bd0e2014-02-14 13:27:07 +0100407 if (of_find_property(np, "sd-uhs-sdr12", &len))
408 host->caps |= MMC_CAP_UHS_SDR12;
409 if (of_find_property(np, "sd-uhs-sdr25", &len))
410 host->caps |= MMC_CAP_UHS_SDR25;
411 if (of_find_property(np, "sd-uhs-sdr50", &len))
412 host->caps |= MMC_CAP_UHS_SDR50;
413 if (of_find_property(np, "sd-uhs-sdr104", &len))
414 host->caps |= MMC_CAP_UHS_SDR104;
415 if (of_find_property(np, "sd-uhs-ddr50", &len))
416 host->caps |= MMC_CAP_UHS_DDR50;
Guennadi Liakhovetski2fdb6e22013-02-15 16:14:01 +0100417 if (of_find_property(np, "cap-power-off-card", &len))
418 host->caps |= MMC_CAP_POWER_OFF_CARD;
419 if (of_find_property(np, "cap-sdio-irq", &len))
420 host->caps |= MMC_CAP_SDIO_IRQ;
Ulf Hansson5a36d6b2013-06-10 17:03:47 +0200421 if (of_find_property(np, "full-pwr-cycle", &len))
422 host->caps2 |= MMC_CAP2_FULL_PWR_CYCLE;
Guennadi Liakhovetski2fdb6e22013-02-15 16:14:01 +0100423 if (of_find_property(np, "keep-power-in-suspend", &len))
424 host->pm_caps |= MMC_PM_KEEP_POWER;
425 if (of_find_property(np, "enable-sdio-wakeup", &len))
426 host->pm_caps |= MMC_PM_WAKE_SDIO_IRQ;
Ulf Hanssonc0baf842014-02-14 13:27:08 +0100427 if (of_find_property(np, "mmc-ddr-1_8v", &len))
428 host->caps |= MMC_CAP_1_8V_DDR;
429 if (of_find_property(np, "mmc-ddr-1_2v", &len))
430 host->caps |= MMC_CAP_1_2V_DDR;
Jaehoon Chung321bd412014-02-14 13:27:09 +0100431 if (of_find_property(np, "mmc-hs200-1_8v", &len))
432 host->caps2 |= MMC_CAP2_HS200_1_8V_SDR;
433 if (of_find_property(np, "mmc-hs200-1_2v", &len))
434 host->caps2 |= MMC_CAP2_HS200_1_2V_SDR;
Seungwon Jeonc373eb42014-04-23 17:15:08 +0900435 if (of_find_property(np, "mmc-hs400-1_8v", &len))
436 host->caps2 |= MMC_CAP2_HS400_1_8V | MMC_CAP2_HS200_1_8V_SDR;
437 if (of_find_property(np, "mmc-hs400-1_2v", &len))
438 host->caps2 |= MMC_CAP2_HS400_1_2V | MMC_CAP2_HS200_1_2V_SDR;
Simon Baatzec0a7512013-06-09 22:14:11 +0200439
Sascha Hauer3d705d12014-08-19 10:45:51 +0200440 host->dsr_req = !of_property_read_u32(np, "dsr", &host->dsr);
441 if (host->dsr_req && (host->dsr & ~0xffff)) {
442 dev_err(host->parent,
443 "device tree specified broken value for DSR: 0x%x, ignoring\n",
444 host->dsr);
445 host->dsr_req = 0;
446 }
447
Simon Baatzec0a7512013-06-09 22:14:11 +0200448 return 0;
Guennadi Liakhovetski6c56e7a2013-02-16 16:21:16 +0100449}
450
451EXPORT_SYMBOL(mmc_of_parse);
452
453/**
Pierre Ossmanb93931a2007-05-19 14:06:24 +0200454 * mmc_alloc_host - initialise the per-host structure.
455 * @extra: sizeof private data structure
456 * @dev: pointer to host device model structure
457 *
458 * Initialise the per-host structure.
459 */
460struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
461{
Pierre Ossmanff3112f2008-03-08 23:43:19 +0100462 int err;
Pierre Ossmanb93931a2007-05-19 14:06:24 +0200463 struct mmc_host *host;
464
Mariusz Kozlowskibe760a92007-08-10 14:00:50 -0700465 host = kzalloc(sizeof(struct mmc_host) + extra, GFP_KERNEL);
Pierre Ossmanb93931a2007-05-19 14:06:24 +0200466 if (!host)
467 return NULL;
468
Guennadi Liakhovetskid9adcc12012-06-14 10:17:39 +0200469 /* scanning will be enabled when we're ready */
470 host->rescan_disable = 1;
Tejun Heo803d9e02013-02-27 17:04:32 -0800471 idr_preload(GFP_KERNEL);
Pierre Ossmanff3112f2008-03-08 23:43:19 +0100472 spin_lock(&mmc_host_lock);
Tejun Heo803d9e02013-02-27 17:04:32 -0800473 err = idr_alloc(&mmc_host_idr, host, 0, 0, GFP_NOWAIT);
474 if (err >= 0)
475 host->index = err;
Pierre Ossmanff3112f2008-03-08 23:43:19 +0100476 spin_unlock(&mmc_host_lock);
Tejun Heo803d9e02013-02-27 17:04:32 -0800477 idr_preload_end();
478 if (err < 0)
Pierre Ossmanff3112f2008-03-08 23:43:19 +0100479 goto free;
480
Kay Sieversd1b26862008-11-08 21:37:46 +0100481 dev_set_name(&host->class_dev, "mmc%d", host->index);
Pierre Ossmanff3112f2008-03-08 23:43:19 +0100482
Pierre Ossmanb93931a2007-05-19 14:06:24 +0200483 host->parent = dev;
484 host->class_dev.parent = dev;
485 host->class_dev.class = &mmc_host_class;
486 device_initialize(&host->class_dev);
487
Linus Walleij04566832010-11-08 21:36:50 -0500488 mmc_host_clk_init(host);
489
Guennadi Liakhovetskia7d1a1e2012-05-01 16:51:38 +0200490 mutex_init(&host->slot.lock);
Guennadi Liakhovetski27410ee2012-05-01 15:40:15 +0200491 host->slot.cd_irq = -EINVAL;
492
Pierre Ossmanb93931a2007-05-19 14:06:24 +0200493 spin_lock_init(&host->lock);
494 init_waitqueue_head(&host->wq);
495 INIT_DELAYED_WORK(&host->detect, mmc_rescan);
Uwe Kleine-König81ca03a2010-08-18 09:25:38 -0700496#ifdef CONFIG_PM
Maxim Levitsky4c2ef252010-08-10 18:01:41 -0700497 host->pm_notify.notifier_call = mmc_pm_notify;
Uwe Kleine-König81ca03a2010-08-18 09:25:38 -0700498#endif
Pierre Ossmanb93931a2007-05-19 14:06:24 +0200499
500 /*
501 * By default, hosts do not support SGIO or large requests.
502 * They have to set these according to their abilities.
503 */
Martin K. Petersena36274e2010-09-10 01:33:59 -0400504 host->max_segs = 1;
Pierre Ossmanb93931a2007-05-19 14:06:24 +0200505 host->max_seg_size = PAGE_CACHE_SIZE;
506
507 host->max_req_size = PAGE_CACHE_SIZE;
508 host->max_blk_size = 512;
509 host->max_blk_count = PAGE_CACHE_SIZE / 512;
510
511 return host;
Pierre Ossmanff3112f2008-03-08 23:43:19 +0100512
513free:
514 kfree(host);
515 return NULL;
Pierre Ossmanb93931a2007-05-19 14:06:24 +0200516}
517
518EXPORT_SYMBOL(mmc_alloc_host);
519
520/**
521 * mmc_add_host - initialise host hardware
522 * @host: mmc host
Pierre Ossman67a61c42007-07-11 20:22:11 +0200523 *
524 * Register the host with the driver model. The host must be
525 * prepared to start servicing requests before this function
526 * completes.
Pierre Ossmanb93931a2007-05-19 14:06:24 +0200527 */
528int mmc_add_host(struct mmc_host *host)
529{
530 int err;
531
Nicolas Pitre17b759a2007-07-24 02:09:39 -0400532 WARN_ON((host->caps & MMC_CAP_SDIO_IRQ) &&
533 !host->ops->enable_sdio_irq);
534
Pierre Ossmanb93931a2007-05-19 14:06:24 +0200535 err = device_add(&host->class_dev);
536 if (err)
537 return err;
538
Wolfram Sangf317dfe2011-04-11 06:11:29 +0200539 led_trigger_register_simple(dev_name(&host->class_dev), &host->led);
540
Haavard Skinnemoen6edd8ee2008-07-24 14:18:57 +0200541#ifdef CONFIG_DEBUG_FS
542 mmc_add_host_debugfs(host);
543#endif
Sujit Reddy Thumma597dd9d792011-11-14 13:53:29 +0530544 mmc_host_clk_sysfs_init(host);
Haavard Skinnemoen6edd8ee2008-07-24 14:18:57 +0200545
Pierre Ossmanb93931a2007-05-19 14:06:24 +0200546 mmc_start_host(host);
Maxim Levitsky4c2ef252010-08-10 18:01:41 -0700547 register_pm_notifier(&host->pm_notify);
Pierre Ossmanb93931a2007-05-19 14:06:24 +0200548
549 return 0;
550}
551
552EXPORT_SYMBOL(mmc_add_host);
553
554/**
555 * mmc_remove_host - remove host hardware
556 * @host: mmc host
557 *
558 * Unregister and remove all cards associated with this host,
Pierre Ossman67a61c42007-07-11 20:22:11 +0200559 * and power down the MMC bus. No new requests will be issued
560 * after this function has returned.
Pierre Ossmanb93931a2007-05-19 14:06:24 +0200561 */
562void mmc_remove_host(struct mmc_host *host)
563{
Maxim Levitsky4c2ef252010-08-10 18:01:41 -0700564 unregister_pm_notifier(&host->pm_notify);
Pierre Ossmanb93931a2007-05-19 14:06:24 +0200565 mmc_stop_host(host);
566
Haavard Skinnemoen6edd8ee2008-07-24 14:18:57 +0200567#ifdef CONFIG_DEBUG_FS
568 mmc_remove_host_debugfs(host);
569#endif
570
Pierre Ossmanb93931a2007-05-19 14:06:24 +0200571 device_del(&host->class_dev);
572
Pierre Ossman77f1fd62007-10-12 22:48:46 +0200573 led_trigger_unregister_simple(host->led);
Linus Walleij04566832010-11-08 21:36:50 -0500574
575 mmc_host_clk_exit(host);
Pierre Ossmanb93931a2007-05-19 14:06:24 +0200576}
577
578EXPORT_SYMBOL(mmc_remove_host);
579
580/**
581 * mmc_free_host - free the host structure
582 * @host: mmc host
583 *
584 * Free the host once all references to it have been dropped.
585 */
586void mmc_free_host(struct mmc_host *host)
587{
Pierre Ossmanff3112f2008-03-08 23:43:19 +0100588 spin_lock(&mmc_host_lock);
589 idr_remove(&mmc_host_idr, host->index);
590 spin_unlock(&mmc_host_lock);
591
Pierre Ossmanb93931a2007-05-19 14:06:24 +0200592 put_device(&host->class_dev);
593}
594
595EXPORT_SYMBOL(mmc_free_host);