blob: cf58ccaf22d50f742e72b76876ad58eb0f966233 [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>
Pierre Ossmanb93931a2007-05-19 14:06:24 +020024
25#include <linux/mmc/host.h>
Linus Walleij04566832010-11-08 21:36:50 -050026#include <linux/mmc/card.h>
Guennadi Liakhovetski6c56e7a2013-02-16 16:21:16 +010027#include <linux/mmc/slot-gpio.h>
Pierre Ossmanb93931a2007-05-19 14:06:24 +020028
29#include "core.h"
30#include "host.h"
Ulf Hanssondf8aca12014-12-18 15:44:36 +010031#include "slot-gpio.h"
Ulf Hansson3aa87932014-11-28 14:38:36 +010032#include "pwrseq.h"
Ulf Hansson68269662017-04-13 16:48:11 +020033#include "sdio_ops.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 Hansson5674a9b2016-04-07 11:40:59 +020037static DEFINE_IDA(mmc_host_ida);
Ulf Hanssone2d19262014-12-18 15:44:35 +010038
Pierre Ossmanb93931a2007-05-19 14:06:24 +020039static void mmc_host_classdev_release(struct device *dev)
40{
41 struct mmc_host *host = cls_dev_to_mmc_host(dev);
Heiner Kallweit7413d1f2017-01-28 09:32:35 +010042 ida_simple_remove(&mmc_host_ida, host->index);
Pierre Ossmanb93931a2007-05-19 14:06:24 +020043 kfree(host);
44}
45
46static struct class mmc_host_class = {
47 .name = "mmc_host",
48 .dev_release = mmc_host_classdev_release,
49};
50
51int mmc_register_host_class(void)
52{
53 return class_register(&mmc_host_class);
54}
55
56void mmc_unregister_host_class(void)
57{
58 class_unregister(&mmc_host_class);
59}
60
Adrian Hunterdfa13eb2015-05-07 13:10:12 +030061void mmc_retune_enable(struct mmc_host *host)
62{
63 host->can_retune = 1;
64 if (host->retune_period)
65 mod_timer(&host->retune_timer,
66 jiffies + host->retune_period * HZ);
67}
68
Adrian Hunter7ff27602016-05-16 15:35:24 +030069/*
70 * Pause re-tuning for a small set of operations. The pause begins after the
71 * next command and after first doing re-tuning.
72 */
73void mmc_retune_pause(struct mmc_host *host)
74{
75 if (!host->retune_paused) {
76 host->retune_paused = 1;
77 mmc_retune_needed(host);
78 mmc_retune_hold(host);
79 }
80}
81EXPORT_SYMBOL(mmc_retune_pause);
82
83void mmc_retune_unpause(struct mmc_host *host)
84{
85 if (host->retune_paused) {
86 host->retune_paused = 0;
87 mmc_retune_release(host);
88 }
89}
90EXPORT_SYMBOL(mmc_retune_unpause);
91
Adrian Hunterdfa13eb2015-05-07 13:10:12 +030092void mmc_retune_disable(struct mmc_host *host)
93{
Adrian Hunter7ff27602016-05-16 15:35:24 +030094 mmc_retune_unpause(host);
Adrian Hunterdfa13eb2015-05-07 13:10:12 +030095 host->can_retune = 0;
96 del_timer_sync(&host->retune_timer);
97 host->retune_now = 0;
98 host->need_retune = 0;
99}
100
101void mmc_retune_timer_stop(struct mmc_host *host)
102{
103 del_timer_sync(&host->retune_timer);
104}
105EXPORT_SYMBOL(mmc_retune_timer_stop);
106
107void mmc_retune_hold(struct mmc_host *host)
108{
109 if (!host->hold_retune)
110 host->retune_now = 1;
111 host->hold_retune += 1;
112}
113
114void mmc_retune_release(struct mmc_host *host)
115{
116 if (host->hold_retune)
117 host->hold_retune -= 1;
118 else
119 WARN_ON(1);
120}
Adrian Huntercb39f612017-09-22 15:36:59 +0300121EXPORT_SYMBOL(mmc_retune_release);
Adrian Hunterdfa13eb2015-05-07 13:10:12 +0300122
123int mmc_retune(struct mmc_host *host)
124{
Adrian Hunter6376f692015-05-07 13:10:20 +0300125 bool return_to_hs400 = false;
Adrian Hunterdfa13eb2015-05-07 13:10:12 +0300126 int err;
127
128 if (host->retune_now)
129 host->retune_now = 0;
130 else
131 return 0;
132
133 if (!host->need_retune || host->doing_retune || !host->card)
134 return 0;
135
136 host->need_retune = 0;
137
138 host->doing_retune = 1;
139
Adrian Hunter6376f692015-05-07 13:10:20 +0300140 if (host->ios.timing == MMC_TIMING_MMC_HS400) {
141 err = mmc_hs400_to_hs200(host->card);
142 if (err)
143 goto out;
Adrian Hunterdfa13eb2015-05-07 13:10:12 +0300144
Adrian Hunter6376f692015-05-07 13:10:20 +0300145 return_to_hs400 = true;
Adrian Hunter6376f692015-05-07 13:10:20 +0300146 }
147
148 err = mmc_execute_tuning(host->card);
149 if (err)
150 goto out;
151
152 if (return_to_hs400)
153 err = mmc_hs200_to_hs400(host->card);
154out:
Adrian Hunterdfa13eb2015-05-07 13:10:12 +0300155 host->doing_retune = 0;
156
157 return err;
158}
159
Kees Cooke99e88a2017-10-16 14:43:17 -0700160static void mmc_retune_timer(struct timer_list *t)
Adrian Hunterdfa13eb2015-05-07 13:10:12 +0300161{
Kees Cooke99e88a2017-10-16 14:43:17 -0700162 struct mmc_host *host = from_timer(host, t, retune_timer);
Adrian Hunterdfa13eb2015-05-07 13:10:12 +0300163
164 mmc_retune_needed(host);
165}
166
Pierre Ossmanb93931a2007-05-19 14:06:24 +0200167/**
Guennadi Liakhovetski6c56e7a2013-02-16 16:21:16 +0100168 * mmc_of_parse() - parse host's device-tree node
169 * @host: host whose node should be parsed.
170 *
171 * To keep the rest of the MMC subsystem unaware of whether DT has been
172 * used to to instantiate and configure this host instance or not, we
173 * parse the properties and set respective generic mmc-host flags and
174 * parameters.
175 */
Simon Baatzec0a7512013-06-09 22:14:11 +0200176int mmc_of_parse(struct mmc_host *host)
Guennadi Liakhovetski6c56e7a2013-02-16 16:21:16 +0100177{
David Woods73a47a92017-05-26 17:53:21 -0400178 struct device *dev = host->parent;
Shawn Linbfd694d2018-04-24 08:42:57 +0800179 u32 bus_width, drv_type, cd_debounce_delay_ms;
Sergei Shtylyov90614cd2015-08-07 01:06:48 +0300180 int ret;
Kristina Martsenkoa31b0c62014-11-05 02:22:41 +0200181 bool cd_cap_invert, cd_gpio_invert = false;
182 bool ro_cap_invert, ro_gpio_invert = false;
Guennadi Liakhovetski6c56e7a2013-02-16 16:21:16 +0100183
David Woods73a47a92017-05-26 17:53:21 -0400184 if (!dev || !dev_fwnode(dev))
Simon Baatzec0a7512013-06-09 22:14:11 +0200185 return 0;
Guennadi Liakhovetski6c56e7a2013-02-16 16:21:16 +0100186
Guennadi Liakhovetski6c56e7a2013-02-16 16:21:16 +0100187 /* "bus-width" is translated to MMC_CAP_*_BIT_DATA flags */
David Woods73a47a92017-05-26 17:53:21 -0400188 if (device_property_read_u32(dev, "bus-width", &bus_width) < 0) {
Guennadi Liakhovetski6c56e7a2013-02-16 16:21:16 +0100189 dev_dbg(host->parent,
190 "\"bus-width\" property is missing, assuming 1 bit.\n");
191 bus_width = 1;
192 }
193
194 switch (bus_width) {
195 case 8:
196 host->caps |= MMC_CAP_8_BIT_DATA;
197 /* Hosts capable of 8-bit transfers can also do 4 bits */
198 case 4:
199 host->caps |= MMC_CAP_4_BIT_DATA;
200 break;
201 case 1:
202 break;
203 default:
204 dev_err(host->parent,
Alexander Shiyan1c279f42014-02-15 15:40:58 +0400205 "Invalid \"bus-width\" value %u!\n", bus_width);
Simon Baatzec0a7512013-06-09 22:14:11 +0200206 return -EINVAL;
Guennadi Liakhovetski6c56e7a2013-02-16 16:21:16 +0100207 }
208
209 /* f_max is obtained from the optional "max-frequency" property */
David Woods73a47a92017-05-26 17:53:21 -0400210 device_property_read_u32(dev, "max-frequency", &host->f_max);
Guennadi Liakhovetski6c56e7a2013-02-16 16:21:16 +0100211
212 /*
213 * Configure CD and WP pins. They are both by default active low to
214 * match the SDHCI spec. If GPIOs are provided for CD and / or WP, the
215 * mmc-gpio helpers are used to attach, configure and use them. If
216 * polarity inversion is specified in DT, one of MMC_CAP2_CD_ACTIVE_HIGH
217 * and MMC_CAP2_RO_ACTIVE_HIGH capability-2 flags is set. If the
218 * "broken-cd" property is provided, the MMC_CAP_NEEDS_POLL capability
219 * is set. If the "non-removable" property is found, the
220 * MMC_CAP_NONREMOVABLE capability is set and no card-detection
221 * configuration is performed.
222 */
223
224 /* Parse Card Detection */
David Woods73a47a92017-05-26 17:53:21 -0400225 if (device_property_read_bool(dev, "non-removable")) {
Guennadi Liakhovetski6c56e7a2013-02-16 16:21:16 +0100226 host->caps |= MMC_CAP_NONREMOVABLE;
227 } else {
David Woods73a47a92017-05-26 17:53:21 -0400228 cd_cap_invert = device_property_read_bool(dev, "cd-inverted");
Guennadi Liakhovetski6c56e7a2013-02-16 16:21:16 +0100229
Shawn Linbfd694d2018-04-24 08:42:57 +0800230 if (device_property_read_u32(dev, "cd-debounce-delay-ms",
231 &cd_debounce_delay_ms))
232 cd_debounce_delay_ms = 200;
233
David Woods73a47a92017-05-26 17:53:21 -0400234 if (device_property_read_bool(dev, "broken-cd"))
Guennadi Liakhovetski6c56e7a2013-02-16 16:21:16 +0100235 host->caps |= MMC_CAP_NEEDS_POLL;
236
Martin Blumenstingle3e47672019-01-01 20:44:14 +0100237 ret = mmc_gpiod_request_cd(host, "cd", 0, false,
Tony Lindgren1d719262018-09-18 16:16:56 -0700238 cd_debounce_delay_ms * 1000,
Shawn Linbfd694d2018-04-24 08:42:57 +0800239 &cd_gpio_invert);
Ulf Hansson91167522014-12-18 10:41:44 +0100240 if (!ret)
Linus Walleij98e90de2014-08-27 13:00:52 +0200241 dev_info(host->parent, "Got CD GPIO\n");
Ulf Hansson43934ec2015-09-14 12:18:55 +0200242 else if (ret != -ENOENT && ret != -ENOSYS)
Ulf Hansson91167522014-12-18 10:41:44 +0100243 return ret;
Linus Walleij89168b42014-10-02 09:08:46 +0200244
245 /*
246 * There are two ways to flag that the CD line is inverted:
247 * through the cd-inverted flag and by the GPIO line itself
248 * being inverted from the GPIO subsystem. This is a leftover
249 * from the times when the GPIO subsystem did not make it
250 * possible to flag a line as inverted.
251 *
252 * If the capability on the host AND the GPIO line are
253 * both inverted, the end result is that the CD line is
254 * not inverted.
255 */
Kristina Martsenkoa31b0c62014-11-05 02:22:41 +0200256 if (cd_cap_invert ^ cd_gpio_invert)
Linus Walleij89168b42014-10-02 09:08:46 +0200257 host->caps2 |= MMC_CAP2_CD_ACTIVE_HIGH;
Guennadi Liakhovetski6c56e7a2013-02-16 16:21:16 +0100258 }
259
260 /* Parse Write Protection */
David Woods73a47a92017-05-26 17:53:21 -0400261 ro_cap_invert = device_property_read_bool(dev, "wp-inverted");
Guennadi Liakhovetski2fdb6e22013-02-15 16:14:01 +0100262
Kristina Martsenkoa31b0c62014-11-05 02:22:41 +0200263 ret = mmc_gpiod_request_ro(host, "wp", 0, false, 0, &ro_gpio_invert);
Ulf Hansson91167522014-12-18 10:41:44 +0100264 if (!ret)
Linus Walleij98e90de2014-08-27 13:00:52 +0200265 dev_info(host->parent, "Got WP GPIO\n");
Ulf Hansson43934ec2015-09-14 12:18:55 +0200266 else if (ret != -ENOENT && ret != -ENOSYS)
Ulf Hansson91167522014-12-18 10:41:44 +0100267 return ret;
Linus Walleij98e90de2014-08-27 13:00:52 +0200268
David Woods73a47a92017-05-26 17:53:21 -0400269 if (device_property_read_bool(dev, "disable-wp"))
Lars-Peter Clausen19f44242015-05-06 20:31:20 +0200270 host->caps2 |= MMC_CAP2_NO_WRITE_PROTECT;
271
Linus Walleij89168b42014-10-02 09:08:46 +0200272 /* See the comment on CD inversion above */
Kristina Martsenkoa31b0c62014-11-05 02:22:41 +0200273 if (ro_cap_invert ^ ro_gpio_invert)
Linus Walleij89168b42014-10-02 09:08:46 +0200274 host->caps2 |= MMC_CAP2_RO_ACTIVE_HIGH;
275
David Woods73a47a92017-05-26 17:53:21 -0400276 if (device_property_read_bool(dev, "cap-sd-highspeed"))
Guennadi Liakhovetski2fdb6e22013-02-15 16:14:01 +0100277 host->caps |= MMC_CAP_SD_HIGHSPEED;
David Woods73a47a92017-05-26 17:53:21 -0400278 if (device_property_read_bool(dev, "cap-mmc-highspeed"))
Guennadi Liakhovetski2fdb6e22013-02-15 16:14:01 +0100279 host->caps |= MMC_CAP_MMC_HIGHSPEED;
David Woods73a47a92017-05-26 17:53:21 -0400280 if (device_property_read_bool(dev, "sd-uhs-sdr12"))
Ulf Hanssonb66bd0e2014-02-14 13:27:07 +0100281 host->caps |= MMC_CAP_UHS_SDR12;
David Woods73a47a92017-05-26 17:53:21 -0400282 if (device_property_read_bool(dev, "sd-uhs-sdr25"))
Ulf Hanssonb66bd0e2014-02-14 13:27:07 +0100283 host->caps |= MMC_CAP_UHS_SDR25;
David Woods73a47a92017-05-26 17:53:21 -0400284 if (device_property_read_bool(dev, "sd-uhs-sdr50"))
Ulf Hanssonb66bd0e2014-02-14 13:27:07 +0100285 host->caps |= MMC_CAP_UHS_SDR50;
David Woods73a47a92017-05-26 17:53:21 -0400286 if (device_property_read_bool(dev, "sd-uhs-sdr104"))
Ulf Hanssonb66bd0e2014-02-14 13:27:07 +0100287 host->caps |= MMC_CAP_UHS_SDR104;
David Woods73a47a92017-05-26 17:53:21 -0400288 if (device_property_read_bool(dev, "sd-uhs-ddr50"))
Ulf Hanssonb66bd0e2014-02-14 13:27:07 +0100289 host->caps |= MMC_CAP_UHS_DDR50;
David Woods73a47a92017-05-26 17:53:21 -0400290 if (device_property_read_bool(dev, "cap-power-off-card"))
Guennadi Liakhovetski2fdb6e22013-02-15 16:14:01 +0100291 host->caps |= MMC_CAP_POWER_OFF_CARD;
David Woods73a47a92017-05-26 17:53:21 -0400292 if (device_property_read_bool(dev, "cap-mmc-hw-reset"))
Chaotian Jing794f1572015-10-27 14:24:21 +0800293 host->caps |= MMC_CAP_HW_RESET;
David Woods73a47a92017-05-26 17:53:21 -0400294 if (device_property_read_bool(dev, "cap-sdio-irq"))
Guennadi Liakhovetski2fdb6e22013-02-15 16:14:01 +0100295 host->caps |= MMC_CAP_SDIO_IRQ;
David Woods73a47a92017-05-26 17:53:21 -0400296 if (device_property_read_bool(dev, "full-pwr-cycle"))
Ulf Hansson5a36d6b2013-06-10 17:03:47 +0200297 host->caps2 |= MMC_CAP2_FULL_PWR_CYCLE;
David Woods73a47a92017-05-26 17:53:21 -0400298 if (device_property_read_bool(dev, "keep-power-in-suspend"))
Guennadi Liakhovetski2fdb6e22013-02-15 16:14:01 +0100299 host->pm_caps |= MMC_PM_KEEP_POWER;
David Woods73a47a92017-05-26 17:53:21 -0400300 if (device_property_read_bool(dev, "wakeup-source") ||
301 device_property_read_bool(dev, "enable-sdio-wakeup")) /* legacy */
Guennadi Liakhovetski2fdb6e22013-02-15 16:14:01 +0100302 host->pm_caps |= MMC_PM_WAKE_SDIO_IRQ;
David Woods73a47a92017-05-26 17:53:21 -0400303 if (device_property_read_bool(dev, "mmc-ddr-3_3v"))
Ulf Hanssonfb00f192017-01-25 12:45:43 +0100304 host->caps |= MMC_CAP_3_3V_DDR;
David Woods73a47a92017-05-26 17:53:21 -0400305 if (device_property_read_bool(dev, "mmc-ddr-1_8v"))
Ulf Hanssonc0baf842014-02-14 13:27:08 +0100306 host->caps |= MMC_CAP_1_8V_DDR;
David Woods73a47a92017-05-26 17:53:21 -0400307 if (device_property_read_bool(dev, "mmc-ddr-1_2v"))
Ulf Hanssonc0baf842014-02-14 13:27:08 +0100308 host->caps |= MMC_CAP_1_2V_DDR;
David Woods73a47a92017-05-26 17:53:21 -0400309 if (device_property_read_bool(dev, "mmc-hs200-1_8v"))
Jaehoon Chung321bd412014-02-14 13:27:09 +0100310 host->caps2 |= MMC_CAP2_HS200_1_8V_SDR;
David Woods73a47a92017-05-26 17:53:21 -0400311 if (device_property_read_bool(dev, "mmc-hs200-1_2v"))
Jaehoon Chung321bd412014-02-14 13:27:09 +0100312 host->caps2 |= MMC_CAP2_HS200_1_2V_SDR;
David Woods73a47a92017-05-26 17:53:21 -0400313 if (device_property_read_bool(dev, "mmc-hs400-1_8v"))
Seungwon Jeonc373eb42014-04-23 17:15:08 +0900314 host->caps2 |= MMC_CAP2_HS400_1_8V | MMC_CAP2_HS200_1_8V_SDR;
David Woods73a47a92017-05-26 17:53:21 -0400315 if (device_property_read_bool(dev, "mmc-hs400-1_2v"))
Seungwon Jeonc373eb42014-04-23 17:15:08 +0900316 host->caps2 |= MMC_CAP2_HS400_1_2V | MMC_CAP2_HS200_1_2V_SDR;
David Woods73a47a92017-05-26 17:53:21 -0400317 if (device_property_read_bool(dev, "mmc-hs400-enhanced-strobe"))
Shawn Linef29c0e2016-05-26 09:56:12 +0800318 host->caps2 |= MMC_CAP2_HS400_ES;
David Woods73a47a92017-05-26 17:53:21 -0400319 if (device_property_read_bool(dev, "no-sdio"))
Shawn Lin6ae3e532016-07-14 16:26:04 +0800320 host->caps2 |= MMC_CAP2_NO_SDIO;
David Woods73a47a92017-05-26 17:53:21 -0400321 if (device_property_read_bool(dev, "no-sd"))
Shawn Lin6ae3e532016-07-14 16:26:04 +0800322 host->caps2 |= MMC_CAP2_NO_SD;
David Woods73a47a92017-05-26 17:53:21 -0400323 if (device_property_read_bool(dev, "no-mmc"))
Shawn Lin6ae3e532016-07-14 16:26:04 +0800324 host->caps2 |= MMC_CAP2_NO_MMC;
Simon Baatzec0a7512013-06-09 22:14:11 +0200325
Wolfram Sang6186d062017-10-15 14:46:14 +0200326 /* Must be after "non-removable" check */
327 if (device_property_read_u32(dev, "fixed-emmc-driver-type", &drv_type) == 0) {
328 if (host->caps & MMC_CAP_NONREMOVABLE)
329 host->fixed_drv_type = drv_type;
330 else
331 dev_err(host->parent,
332 "can't use fixed driver type, media is removable\n");
333 }
334
David Woods73a47a92017-05-26 17:53:21 -0400335 host->dsr_req = !device_property_read_u32(dev, "dsr", &host->dsr);
Sascha Hauer3d705d12014-08-19 10:45:51 +0200336 if (host->dsr_req && (host->dsr & ~0xffff)) {
337 dev_err(host->parent,
338 "device tree specified broken value for DSR: 0x%x, ignoring\n",
339 host->dsr);
340 host->dsr_req = 0;
341 }
342
Shawn Lin6d796c62018-05-08 09:04:20 +0800343 device_property_read_u32(dev, "post-power-on-delay-ms",
344 &host->ios.power_delay_ms);
345
Ulf Hansson3aa87932014-11-28 14:38:36 +0100346 return mmc_pwrseq_alloc(host);
Guennadi Liakhovetski6c56e7a2013-02-16 16:21:16 +0100347}
348
349EXPORT_SYMBOL(mmc_of_parse);
350
351/**
Pierre Ossmanb93931a2007-05-19 14:06:24 +0200352 * mmc_alloc_host - initialise the per-host structure.
353 * @extra: sizeof private data structure
354 * @dev: pointer to host device model structure
355 *
356 * Initialise the per-host structure.
357 */
358struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
359{
Pierre Ossmanff3112f2008-03-08 23:43:19 +0100360 int err;
Pierre Ossmanb93931a2007-05-19 14:06:24 +0200361 struct mmc_host *host;
362
Mariusz Kozlowskibe760a92007-08-10 14:00:50 -0700363 host = kzalloc(sizeof(struct mmc_host) + extra, GFP_KERNEL);
Pierre Ossmanb93931a2007-05-19 14:06:24 +0200364 if (!host)
365 return NULL;
366
Guennadi Liakhovetskid9adcc12012-06-14 10:17:39 +0200367 /* scanning will be enabled when we're ready */
368 host->rescan_disable = 1;
Ulf Hansson5674a9b2016-04-07 11:40:59 +0200369
Heiner Kallweit7413d1f2017-01-28 09:32:35 +0100370 err = ida_simple_get(&mmc_host_ida, 0, 0, GFP_KERNEL);
371 if (err < 0) {
Ulf Hansson5674a9b2016-04-07 11:40:59 +0200372 kfree(host);
373 return NULL;
374 }
375
Heiner Kallweit7413d1f2017-01-28 09:32:35 +0100376 host->index = err;
Pierre Ossmanff3112f2008-03-08 23:43:19 +0100377
Kay Sieversd1b26862008-11-08 21:37:46 +0100378 dev_set_name(&host->class_dev, "mmc%d", host->index);
Pierre Ossmanff3112f2008-03-08 23:43:19 +0100379
Pierre Ossmanb93931a2007-05-19 14:06:24 +0200380 host->parent = dev;
381 host->class_dev.parent = dev;
382 host->class_dev.class = &mmc_host_class;
383 device_initialize(&host->class_dev);
Fu, Zhonghuiccf7bfd2016-01-22 11:32:18 +0800384 device_enable_async_suspend(&host->class_dev);
Pierre Ossmanb93931a2007-05-19 14:06:24 +0200385
Ulf Hanssondf8aca12014-12-18 15:44:36 +0100386 if (mmc_gpio_alloc(host)) {
387 put_device(&host->class_dev);
Heiner Kallweit1ed21712017-01-28 09:32:50 +0100388 ida_simple_remove(&mmc_host_ida, host->index);
389 kfree(host);
Ulf Hanssondf8aca12014-12-18 15:44:36 +0100390 return NULL;
391 }
Linus Walleij04566832010-11-08 21:36:50 -0500392
Pierre Ossmanb93931a2007-05-19 14:06:24 +0200393 spin_lock_init(&host->lock);
394 init_waitqueue_head(&host->wq);
395 INIT_DELAYED_WORK(&host->detect, mmc_rescan);
Ulf Hansson68269662017-04-13 16:48:11 +0200396 INIT_DELAYED_WORK(&host->sdio_irq_work, sdio_irq_work);
Kees Cooke99e88a2017-10-16 14:43:17 -0700397 timer_setup(&host->retune_timer, mmc_retune_timer, 0);
Pierre Ossmanb93931a2007-05-19 14:06:24 +0200398
399 /*
400 * By default, hosts do not support SGIO or large requests.
401 * They have to set these according to their abilities.
402 */
Martin K. Petersena36274e2010-09-10 01:33:59 -0400403 host->max_segs = 1;
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +0300404 host->max_seg_size = PAGE_SIZE;
Pierre Ossmanb93931a2007-05-19 14:06:24 +0200405
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +0300406 host->max_req_size = PAGE_SIZE;
Pierre Ossmanb93931a2007-05-19 14:06:24 +0200407 host->max_blk_size = 512;
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +0300408 host->max_blk_count = PAGE_SIZE / 512;
Pierre Ossmanb93931a2007-05-19 14:06:24 +0200409
Wolfram Sang6186d062017-10-15 14:46:14 +0200410 host->fixed_drv_type = -EINVAL;
Shawn Lin6d796c62018-05-08 09:04:20 +0800411 host->ios.power_delay_ms = 10;
Wolfram Sang6186d062017-10-15 14:46:14 +0200412
Pierre Ossmanb93931a2007-05-19 14:06:24 +0200413 return host;
414}
415
416EXPORT_SYMBOL(mmc_alloc_host);
417
418/**
419 * mmc_add_host - initialise host hardware
420 * @host: mmc host
Pierre Ossman67a61c42007-07-11 20:22:11 +0200421 *
422 * Register the host with the driver model. The host must be
423 * prepared to start servicing requests before this function
424 * completes.
Pierre Ossmanb93931a2007-05-19 14:06:24 +0200425 */
426int mmc_add_host(struct mmc_host *host)
427{
428 int err;
429
Nicolas Pitre17b759a2007-07-24 02:09:39 -0400430 WARN_ON((host->caps & MMC_CAP_SDIO_IRQ) &&
431 !host->ops->enable_sdio_irq);
432
Pierre Ossmanb93931a2007-05-19 14:06:24 +0200433 err = device_add(&host->class_dev);
434 if (err)
435 return err;
436
Wolfram Sangf317dfe2011-04-11 06:11:29 +0200437 led_trigger_register_simple(dev_name(&host->class_dev), &host->led);
438
Haavard Skinnemoen6edd8ee2008-07-24 14:18:57 +0200439#ifdef CONFIG_DEBUG_FS
440 mmc_add_host_debugfs(host);
441#endif
442
Pierre Ossmanb93931a2007-05-19 14:06:24 +0200443 mmc_start_host(host);
Ulf Hansson8dede182015-11-05 16:11:12 +0100444 mmc_register_pm_notifier(host);
Pierre Ossmanb93931a2007-05-19 14:06:24 +0200445
446 return 0;
447}
448
449EXPORT_SYMBOL(mmc_add_host);
450
451/**
452 * mmc_remove_host - remove host hardware
453 * @host: mmc host
454 *
455 * Unregister and remove all cards associated with this host,
Pierre Ossman67a61c42007-07-11 20:22:11 +0200456 * and power down the MMC bus. No new requests will be issued
457 * after this function has returned.
Pierre Ossmanb93931a2007-05-19 14:06:24 +0200458 */
459void mmc_remove_host(struct mmc_host *host)
460{
Ulf Hansson8dede182015-11-05 16:11:12 +0100461 mmc_unregister_pm_notifier(host);
Pierre Ossmanb93931a2007-05-19 14:06:24 +0200462 mmc_stop_host(host);
463
Haavard Skinnemoen6edd8ee2008-07-24 14:18:57 +0200464#ifdef CONFIG_DEBUG_FS
465 mmc_remove_host_debugfs(host);
466#endif
467
Pierre Ossmanb93931a2007-05-19 14:06:24 +0200468 device_del(&host->class_dev);
469
Pierre Ossman77f1fd6e2007-10-12 22:48:46 +0200470 led_trigger_unregister_simple(host->led);
Pierre Ossmanb93931a2007-05-19 14:06:24 +0200471}
472
473EXPORT_SYMBOL(mmc_remove_host);
474
475/**
476 * mmc_free_host - free the host structure
477 * @host: mmc host
478 *
479 * Free the host once all references to it have been dropped.
480 */
481void mmc_free_host(struct mmc_host *host)
482{
Ulf Hansson3aa87932014-11-28 14:38:36 +0100483 mmc_pwrseq_free(host);
Pierre Ossmanb93931a2007-05-19 14:06:24 +0200484 put_device(&host->class_dev);
485}
486
487EXPORT_SYMBOL(mmc_free_host);