2 * linux/drivers/mmc/core/host.c
4 * Copyright (C) 2003 Russell King, All Rights Reserved.
5 * Copyright (C) 2007-2008 Pierre Ossman
6 * Copyright (C) 2010 Linus Walleij
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.
12 * MMC host class device management
15 #include <linux/device.h>
16 #include <linux/err.h>
17 #include <linux/idr.h>
19 #include <linux/of_gpio.h>
20 #include <linux/pagemap.h>
21 #include <linux/export.h>
22 #include <linux/leds.h>
23 #include <linux/slab.h>
24 #include <linux/suspend.h>
26 #include <linux/mmc/host.h>
27 #include <linux/mmc/card.h>
28 #include <linux/mmc/slot-gpio.h>
32 #include "slot-gpio.h"
35 static DEFINE_IDR(mmc_host_idr);
36 static DEFINE_SPINLOCK(mmc_host_lock);
38 static void mmc_host_classdev_release(struct device *dev)
40 struct mmc_host *host = cls_dev_to_mmc_host(dev);
41 spin_lock(&mmc_host_lock);
42 idr_remove(&mmc_host_idr, host->index);
43 spin_unlock(&mmc_host_lock);
47 static struct class mmc_host_class = {
49 .dev_release = mmc_host_classdev_release,
52 int mmc_register_host_class(void)
54 return class_register(&mmc_host_class);
57 void mmc_unregister_host_class(void)
59 class_unregister(&mmc_host_class);
62 void mmc_retune_enable(struct mmc_host *host)
65 if (host->retune_period)
66 mod_timer(&host->retune_timer,
67 jiffies + host->retune_period * HZ);
70 void mmc_retune_disable(struct mmc_host *host)
73 del_timer_sync(&host->retune_timer);
75 host->need_retune = 0;
78 void mmc_retune_timer_stop(struct mmc_host *host)
80 del_timer_sync(&host->retune_timer);
82 EXPORT_SYMBOL(mmc_retune_timer_stop);
84 void mmc_retune_hold(struct mmc_host *host)
86 if (!host->hold_retune)
88 host->hold_retune += 1;
91 void mmc_retune_release(struct mmc_host *host)
93 if (host->hold_retune)
94 host->hold_retune -= 1;
99 int mmc_retune(struct mmc_host *host)
101 bool return_to_hs400 = false;
104 if (host->retune_now)
105 host->retune_now = 0;
109 if (!host->need_retune || host->doing_retune || !host->card)
112 host->need_retune = 0;
114 host->doing_retune = 1;
116 if (host->ios.timing == MMC_TIMING_MMC_HS400) {
117 err = mmc_hs400_to_hs200(host->card);
121 return_to_hs400 = true;
123 if (host->ops->prepare_hs400_tuning)
124 host->ops->prepare_hs400_tuning(host, &host->ios);
127 err = mmc_execute_tuning(host->card);
132 err = mmc_hs200_to_hs400(host->card);
134 host->doing_retune = 0;
139 static void mmc_retune_timer(unsigned long data)
141 struct mmc_host *host = (struct mmc_host *)data;
143 mmc_retune_needed(host);
147 * mmc_of_parse() - parse host's device-tree node
148 * @host: host whose node should be parsed.
150 * To keep the rest of the MMC subsystem unaware of whether DT has been
151 * used to to instantiate and configure this host instance or not, we
152 * parse the properties and set respective generic mmc-host flags and
155 int mmc_of_parse(struct mmc_host *host)
157 struct device_node *np;
160 bool cd_cap_invert, cd_gpio_invert = false;
161 bool ro_cap_invert, ro_gpio_invert = false;
162 enum of_gpio_flags pwrseq_flags;
165 if (!host->parent || !host->parent->of_node)
168 np = host->parent->of_node;
170 pwrseq_gpio = of_get_named_gpio_flags(np, "pwrseq-gpio", 0, &pwrseq_flags);
171 if ( gpio_is_valid(pwrseq_gpio) ) {
172 ret = devm_gpio_request_one(&host->class_dev, pwrseq_gpio, (pwrseq_flags & OF_GPIO_ACTIVE_LOW) ? GPIOF_OUT_INIT_LOW : GPIOF_OUT_INIT_HIGH, "sdpwr-gpio");
174 dev_err(&host->class_dev, "request sdcard pwrseq gpio error\n");
179 /* "bus-width" is translated to MMC_CAP_*_BIT_DATA flags */
180 if (of_property_read_u32(np, "bus-width", &bus_width) < 0) {
181 dev_dbg(host->parent,
182 "\"bus-width\" property is missing, assuming 1 bit.\n");
188 host->caps |= MMC_CAP_8_BIT_DATA;
189 /* Hosts capable of 8-bit transfers can also do 4 bits */
191 host->caps |= MMC_CAP_4_BIT_DATA;
196 dev_err(host->parent,
197 "Invalid \"bus-width\" value %u!\n", bus_width);
201 /* f_max is obtained from the optional "max-frequency" property */
202 of_property_read_u32(np, "max-frequency", &host->f_max);
205 * Configure CD and WP pins. They are both by default active low to
206 * match the SDHCI spec. If GPIOs are provided for CD and / or WP, the
207 * mmc-gpio helpers are used to attach, configure and use them. If
208 * polarity inversion is specified in DT, one of MMC_CAP2_CD_ACTIVE_HIGH
209 * and MMC_CAP2_RO_ACTIVE_HIGH capability-2 flags is set. If the
210 * "broken-cd" property is provided, the MMC_CAP_NEEDS_POLL capability
211 * is set. If the "non-removable" property is found, the
212 * MMC_CAP_NONREMOVABLE capability is set and no card-detection
213 * configuration is performed.
216 /* Parse Card Detection */
217 if (of_property_read_bool(np, "non-removable")) {
218 host->caps |= MMC_CAP_NONREMOVABLE;
220 cd_cap_invert = of_property_read_bool(np, "cd-inverted");
222 if (of_property_read_bool(np, "broken-cd"))
223 host->caps |= MMC_CAP_NEEDS_POLL;
225 ret = mmc_gpiod_request_cd(host, "cd", 0, true,
228 dev_info(host->parent, "Got CD GPIO\n");
229 else if (ret != -ENOENT && ret != -ENOSYS)
233 * There are two ways to flag that the CD line is inverted:
234 * through the cd-inverted flag and by the GPIO line itself
235 * being inverted from the GPIO subsystem. This is a leftover
236 * from the times when the GPIO subsystem did not make it
237 * possible to flag a line as inverted.
239 * If the capability on the host AND the GPIO line are
240 * both inverted, the end result is that the CD line is
243 if (cd_cap_invert ^ cd_gpio_invert)
244 host->caps2 |= MMC_CAP2_CD_ACTIVE_HIGH;
247 /* Parse Write Protection */
248 ro_cap_invert = of_property_read_bool(np, "wp-inverted");
250 ret = mmc_gpiod_request_ro(host, "wp", 0, false, 0, &ro_gpio_invert);
252 dev_info(host->parent, "Got WP GPIO\n");
253 else if (ret != -ENOENT && ret != -ENOSYS)
256 if (of_property_read_bool(np, "disable-wp"))
257 host->caps2 |= MMC_CAP2_NO_WRITE_PROTECT;
259 /* See the comment on CD inversion above */
260 if (ro_cap_invert ^ ro_gpio_invert)
261 host->caps2 |= MMC_CAP2_RO_ACTIVE_HIGH;
263 if (of_property_read_bool(np, "cap-sd-highspeed"))
264 host->caps |= MMC_CAP_SD_HIGHSPEED;
265 if (of_property_read_bool(np, "cap-mmc-highspeed"))
266 host->caps |= MMC_CAP_MMC_HIGHSPEED;
267 if (of_property_read_bool(np, "sd-uhs-sdr12"))
268 host->caps |= MMC_CAP_UHS_SDR12;
269 if (of_property_read_bool(np, "sd-uhs-sdr25"))
270 host->caps |= MMC_CAP_UHS_SDR25;
271 if (of_property_read_bool(np, "sd-uhs-sdr50"))
272 host->caps |= MMC_CAP_UHS_SDR50;
273 if (of_property_read_bool(np, "sd-uhs-sdr104"))
274 host->caps |= MMC_CAP_UHS_SDR104;
275 if (of_property_read_bool(np, "sd-uhs-ddr50"))
276 host->caps |= MMC_CAP_UHS_DDR50;
277 if (of_property_read_bool(np, "cap-power-off-card"))
278 host->caps |= MMC_CAP_POWER_OFF_CARD;
279 if (of_property_read_bool(np, "cap-mmc-hw-reset"))
280 host->caps |= MMC_CAP_HW_RESET;
281 if (of_property_read_bool(np, "cap-sdio-irq"))
282 host->caps |= MMC_CAP_SDIO_IRQ;
283 if (of_property_read_bool(np, "full-pwr-cycle"))
284 host->caps2 |= MMC_CAP2_FULL_PWR_CYCLE;
285 if (of_property_read_bool(np, "keep-power-in-suspend"))
286 host->pm_caps |= MMC_PM_KEEP_POWER;
287 if (of_property_read_bool(np, "enable-sdio-wakeup"))
288 host->pm_caps |= MMC_PM_WAKE_SDIO_IRQ;
289 if (of_property_read_bool(np, "mmc-ddr-1_8v"))
290 host->caps |= MMC_CAP_1_8V_DDR;
291 if (of_property_read_bool(np, "mmc-ddr-1_2v"))
292 host->caps |= MMC_CAP_1_2V_DDR;
293 if (of_property_read_bool(np, "mmc-hs200-1_8v"))
294 host->caps2 |= MMC_CAP2_HS200_1_8V_SDR;
295 if (of_property_read_bool(np, "mmc-hs200-1_2v"))
296 host->caps2 |= MMC_CAP2_HS200_1_2V_SDR;
297 if (of_property_read_bool(np, "mmc-hs400-1_8v"))
298 host->caps2 |= MMC_CAP2_HS400_1_8V | MMC_CAP2_HS200_1_8V_SDR;
299 if (of_property_read_bool(np, "mmc-hs400-1_2v"))
300 host->caps2 |= MMC_CAP2_HS400_1_2V | MMC_CAP2_HS200_1_2V_SDR;
301 if (of_property_read_bool(np, "mmc-hs400-enhanced-strobe"))
302 host->caps2 |= MMC_CAP2_HS400_ES;
304 if (of_property_read_bool(np, "supports-sd"))
305 host->restrict_caps |= RESTRICT_CARD_TYPE_SD;
306 if (of_property_read_bool(np, "supports-sdio"))
307 host->restrict_caps |= RESTRICT_CARD_TYPE_SDIO;
308 if (of_property_read_bool(np, "supports-emmc"))
309 host->restrict_caps |= RESTRICT_CARD_TYPE_EMMC;
311 host->dsr_req = !of_property_read_u32(np, "dsr", &host->dsr);
312 if (host->dsr_req && (host->dsr & ~0xffff)) {
313 dev_err(host->parent,
314 "device tree specified broken value for DSR: 0x%x, ignoring\n",
319 return mmc_pwrseq_alloc(host);
322 EXPORT_SYMBOL(mmc_of_parse);
325 * mmc_alloc_host - initialise the per-host structure.
326 * @extra: sizeof private data structure
327 * @dev: pointer to host device model structure
329 * Initialise the per-host structure.
331 struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
334 struct mmc_host *host;
336 host = kzalloc(sizeof(struct mmc_host) + extra, GFP_KERNEL);
340 /* scanning will be enabled when we're ready */
341 host->rescan_disable = 1;
342 idr_preload(GFP_KERNEL);
343 spin_lock(&mmc_host_lock);
344 err = idr_alloc(&mmc_host_idr, host, 0, 0, GFP_NOWAIT);
347 spin_unlock(&mmc_host_lock);
354 dev_set_name(&host->class_dev, "mmc%d", host->index);
357 host->class_dev.parent = dev;
358 host->class_dev.class = &mmc_host_class;
359 device_initialize(&host->class_dev);
361 if (mmc_gpio_alloc(host)) {
362 put_device(&host->class_dev);
366 spin_lock_init(&host->lock);
367 init_waitqueue_head(&host->wq);
368 INIT_DELAYED_WORK(&host->detect, mmc_rescan);
370 host->pm_notify.notifier_call = mmc_pm_notify;
372 setup_timer(&host->retune_timer, mmc_retune_timer, (unsigned long)host);
375 * By default, hosts do not support SGIO or large requests.
376 * They have to set these according to their abilities.
379 host->max_seg_size = PAGE_CACHE_SIZE;
381 host->max_req_size = PAGE_CACHE_SIZE;
382 host->max_blk_size = 512;
383 host->max_blk_count = PAGE_CACHE_SIZE / 512;
388 EXPORT_SYMBOL(mmc_alloc_host);
391 * mmc_add_host - initialise host hardware
394 * Register the host with the driver model. The host must be
395 * prepared to start servicing requests before this function
398 struct mmc_host *primary_sdio_host;
399 int mmc_add_host(struct mmc_host *host)
403 WARN_ON((host->caps & MMC_CAP_SDIO_IRQ) &&
404 !host->ops->enable_sdio_irq);
406 err = device_add(&host->class_dev);
410 led_trigger_register_simple(dev_name(&host->class_dev), &host->led);
412 #ifdef CONFIG_DEBUG_FS
413 mmc_add_host_debugfs(host);
417 mmc_latency_hist_sysfs_init(host);
420 mmc_start_host(host);
421 if (!(host->pm_flags & MMC_PM_IGNORE_PM_NOTIFY))
422 register_pm_notifier(&host->pm_notify);
424 if (host->restrict_caps & RESTRICT_CARD_TYPE_SDIO)
425 primary_sdio_host = host;
430 EXPORT_SYMBOL(mmc_add_host);
433 * mmc_remove_host - remove host hardware
436 * Unregister and remove all cards associated with this host,
437 * and power down the MMC bus. No new requests will be issued
438 * after this function has returned.
440 void mmc_remove_host(struct mmc_host *host)
442 if (!(host->pm_flags & MMC_PM_IGNORE_PM_NOTIFY))
443 unregister_pm_notifier(&host->pm_notify);
447 #ifdef CONFIG_DEBUG_FS
448 mmc_remove_host_debugfs(host);
452 mmc_latency_hist_sysfs_exit(host);
455 device_del(&host->class_dev);
457 led_trigger_unregister_simple(host->led);
460 EXPORT_SYMBOL(mmc_remove_host);
463 * mmc_free_host - free the host structure
466 * Free the host once all references to it have been dropped.
468 void mmc_free_host(struct mmc_host *host)
470 mmc_pwrseq_free(host);
471 put_device(&host->class_dev);
474 EXPORT_SYMBOL(mmc_free_host);
477 * mmc_host_rescan - triger software rescan flow
480 * rescan slot attach in the assigned host.
481 * If @host is NULL, default rescan primary_sdio_host
482 * saved by mmc_add_host().
483 * OR, rescan host from argument.
486 int mmc_host_rescan(struct mmc_host *host, int val, int is_cap_sdio_irq)
488 if (NULL != primary_sdio_host) {
490 host = primary_sdio_host;
492 pr_info("%s: mmc_host_rescan pass in host from argument!\n",
495 pr_err("sdio: host isn't initialization successfully.\n");
499 pr_info("%s:mmc host rescan start!\n", mmc_hostname(host));
501 /* 0: oob 1:cap-sdio-irq */
502 if (is_cap_sdio_irq == 1) {
503 host->caps |= MMC_CAP_SDIO_IRQ;
504 } else if (is_cap_sdio_irq == 0) {
505 host->caps &= ~MMC_CAP_SDIO_IRQ;
507 dev_err(&host->class_dev, "sdio: host doesn't identify oob or sdio_irq mode!\n");
511 if (!(host->caps & MMC_CAP_NONREMOVABLE) && host->ops->set_sdio_status)
512 host->ops->set_sdio_status(host, val);
516 EXPORT_SYMBOL(mmc_host_rescan);