1 // SPDX-License-Identifier: GPL-2.0-only
3 * linux/drivers/mmc/core/host.c
5 * Copyright (C) 2003 Russell King, All Rights Reserved.
6 * Copyright (C) 2007-2008 Pierre Ossman
7 * Copyright (C) 2010 Linus Walleij
9 * MMC host class device management
12 #include <linux/device.h>
13 #include <linux/err.h>
14 #include <linux/idr.h>
16 #include <linux/of_gpio.h>
17 #include <linux/pagemap.h>
18 #include <linux/export.h>
19 #include <linux/leds.h>
20 #include <linux/slab.h>
22 #include <linux/mmc/host.h>
23 #include <linux/mmc/card.h>
24 #include <linux/mmc/slot-gpio.h>
28 #include "slot-gpio.h"
32 #define cls_dev_to_mmc_host(d) container_of(d, struct mmc_host, class_dev)
34 static DEFINE_IDA(mmc_host_ida);
36 static void mmc_host_classdev_release(struct device *dev)
38 struct mmc_host *host = cls_dev_to_mmc_host(dev);
39 ida_simple_remove(&mmc_host_ida, host->index);
43 static struct class mmc_host_class = {
45 .dev_release = mmc_host_classdev_release,
48 int mmc_register_host_class(void)
50 return class_register(&mmc_host_class);
53 void mmc_unregister_host_class(void)
55 class_unregister(&mmc_host_class);
58 void mmc_retune_enable(struct mmc_host *host)
61 if (host->retune_period)
62 mod_timer(&host->retune_timer,
63 jiffies + host->retune_period * HZ);
67 * Pause re-tuning for a small set of operations. The pause begins after the
68 * next command and after first doing re-tuning.
70 void mmc_retune_pause(struct mmc_host *host)
72 if (!host->retune_paused) {
73 host->retune_paused = 1;
74 mmc_retune_needed(host);
75 mmc_retune_hold(host);
78 EXPORT_SYMBOL(mmc_retune_pause);
80 void mmc_retune_unpause(struct mmc_host *host)
82 if (host->retune_paused) {
83 host->retune_paused = 0;
84 mmc_retune_release(host);
87 EXPORT_SYMBOL(mmc_retune_unpause);
89 void mmc_retune_disable(struct mmc_host *host)
91 mmc_retune_unpause(host);
93 del_timer_sync(&host->retune_timer);
95 host->need_retune = 0;
98 void mmc_retune_timer_stop(struct mmc_host *host)
100 del_timer_sync(&host->retune_timer);
102 EXPORT_SYMBOL(mmc_retune_timer_stop);
104 void mmc_retune_hold(struct mmc_host *host)
106 if (!host->hold_retune)
107 host->retune_now = 1;
108 host->hold_retune += 1;
111 void mmc_retune_release(struct mmc_host *host)
113 if (host->hold_retune)
114 host->hold_retune -= 1;
118 EXPORT_SYMBOL(mmc_retune_release);
120 int mmc_retune(struct mmc_host *host)
122 bool return_to_hs400 = false;
125 if (host->retune_now)
126 host->retune_now = 0;
130 if (!host->need_retune || host->doing_retune || !host->card)
133 host->need_retune = 0;
135 host->doing_retune = 1;
137 if (host->ios.timing == MMC_TIMING_MMC_HS400) {
138 err = mmc_hs400_to_hs200(host->card);
142 return_to_hs400 = true;
145 err = mmc_execute_tuning(host->card);
150 err = mmc_hs200_to_hs400(host->card);
152 host->doing_retune = 0;
157 static void mmc_retune_timer(struct timer_list *t)
159 struct mmc_host *host = from_timer(host, t, retune_timer);
161 mmc_retune_needed(host);
165 * mmc_of_parse() - parse host's device-tree node
166 * @host: host whose node should be parsed.
168 * To keep the rest of the MMC subsystem unaware of whether DT has been
169 * used to to instantiate and configure this host instance or not, we
170 * parse the properties and set respective generic mmc-host flags and
173 int mmc_of_parse(struct mmc_host *host)
175 struct device *dev = host->parent;
176 u32 bus_width, drv_type, cd_debounce_delay_ms;
179 if (!dev || !dev_fwnode(dev))
182 /* "bus-width" is translated to MMC_CAP_*_BIT_DATA flags */
183 if (device_property_read_u32(dev, "bus-width", &bus_width) < 0) {
184 dev_dbg(host->parent,
185 "\"bus-width\" property is missing, assuming 1 bit.\n");
191 host->caps |= MMC_CAP_8_BIT_DATA;
192 /* fall through - Hosts capable of 8-bit can also do 4 bits */
194 host->caps |= MMC_CAP_4_BIT_DATA;
199 dev_err(host->parent,
200 "Invalid \"bus-width\" value %u!\n", bus_width);
204 /* f_max is obtained from the optional "max-frequency" property */
205 device_property_read_u32(dev, "max-frequency", &host->f_max);
208 * Configure CD and WP pins. They are both by default active low to
209 * match the SDHCI spec. If GPIOs are provided for CD and / or WP, the
210 * mmc-gpio helpers are used to attach, configure and use them. If
211 * polarity inversion is specified in DT, one of MMC_CAP2_CD_ACTIVE_HIGH
212 * and MMC_CAP2_RO_ACTIVE_HIGH capability-2 flags is set. If the
213 * "broken-cd" property is provided, the MMC_CAP_NEEDS_POLL capability
214 * is set. If the "non-removable" property is found, the
215 * MMC_CAP_NONREMOVABLE capability is set and no card-detection
216 * configuration is performed.
219 /* Parse Card Detection */
221 if (device_property_read_bool(dev, "non-removable")) {
222 host->caps |= MMC_CAP_NONREMOVABLE;
224 if (device_property_read_bool(dev, "cd-inverted"))
225 host->caps2 |= MMC_CAP2_CD_ACTIVE_HIGH;
227 if (device_property_read_u32(dev, "cd-debounce-delay-ms",
228 &cd_debounce_delay_ms))
229 cd_debounce_delay_ms = 200;
231 if (device_property_read_bool(dev, "broken-cd"))
232 host->caps |= MMC_CAP_NEEDS_POLL;
234 ret = mmc_gpiod_request_cd(host, "cd", 0, false,
235 cd_debounce_delay_ms * 1000);
237 dev_info(host->parent, "Got CD GPIO\n");
238 else if (ret != -ENOENT && ret != -ENOSYS)
242 /* Parse Write Protection */
244 if (device_property_read_bool(dev, "wp-inverted"))
245 host->caps2 |= MMC_CAP2_RO_ACTIVE_HIGH;
247 ret = mmc_gpiod_request_ro(host, "wp", 0, 0);
249 dev_info(host->parent, "Got WP GPIO\n");
250 else if (ret != -ENOENT && ret != -ENOSYS)
253 if (device_property_read_bool(dev, "disable-wp"))
254 host->caps2 |= MMC_CAP2_NO_WRITE_PROTECT;
256 if (device_property_read_bool(dev, "cap-sd-highspeed"))
257 host->caps |= MMC_CAP_SD_HIGHSPEED;
258 if (device_property_read_bool(dev, "cap-mmc-highspeed"))
259 host->caps |= MMC_CAP_MMC_HIGHSPEED;
260 if (device_property_read_bool(dev, "sd-uhs-sdr12"))
261 host->caps |= MMC_CAP_UHS_SDR12;
262 if (device_property_read_bool(dev, "sd-uhs-sdr25"))
263 host->caps |= MMC_CAP_UHS_SDR25;
264 if (device_property_read_bool(dev, "sd-uhs-sdr50"))
265 host->caps |= MMC_CAP_UHS_SDR50;
266 if (device_property_read_bool(dev, "sd-uhs-sdr104"))
267 host->caps |= MMC_CAP_UHS_SDR104;
268 if (device_property_read_bool(dev, "sd-uhs-ddr50"))
269 host->caps |= MMC_CAP_UHS_DDR50;
270 if (device_property_read_bool(dev, "cap-power-off-card"))
271 host->caps |= MMC_CAP_POWER_OFF_CARD;
272 if (device_property_read_bool(dev, "cap-mmc-hw-reset"))
273 host->caps |= MMC_CAP_HW_RESET;
274 if (device_property_read_bool(dev, "cap-sdio-irq"))
275 host->caps |= MMC_CAP_SDIO_IRQ;
276 if (device_property_read_bool(dev, "full-pwr-cycle"))
277 host->caps2 |= MMC_CAP2_FULL_PWR_CYCLE;
278 if (device_property_read_bool(dev, "keep-power-in-suspend"))
279 host->pm_caps |= MMC_PM_KEEP_POWER;
280 if (device_property_read_bool(dev, "wakeup-source") ||
281 device_property_read_bool(dev, "enable-sdio-wakeup")) /* legacy */
282 host->pm_caps |= MMC_PM_WAKE_SDIO_IRQ;
283 if (device_property_read_bool(dev, "mmc-ddr-3_3v"))
284 host->caps |= MMC_CAP_3_3V_DDR;
285 if (device_property_read_bool(dev, "mmc-ddr-1_8v"))
286 host->caps |= MMC_CAP_1_8V_DDR;
287 if (device_property_read_bool(dev, "mmc-ddr-1_2v"))
288 host->caps |= MMC_CAP_1_2V_DDR;
289 if (device_property_read_bool(dev, "mmc-hs200-1_8v"))
290 host->caps2 |= MMC_CAP2_HS200_1_8V_SDR;
291 if (device_property_read_bool(dev, "mmc-hs200-1_2v"))
292 host->caps2 |= MMC_CAP2_HS200_1_2V_SDR;
293 if (device_property_read_bool(dev, "mmc-hs400-1_8v"))
294 host->caps2 |= MMC_CAP2_HS400_1_8V | MMC_CAP2_HS200_1_8V_SDR;
295 if (device_property_read_bool(dev, "mmc-hs400-1_2v"))
296 host->caps2 |= MMC_CAP2_HS400_1_2V | MMC_CAP2_HS200_1_2V_SDR;
297 if (device_property_read_bool(dev, "mmc-hs400-enhanced-strobe"))
298 host->caps2 |= MMC_CAP2_HS400_ES;
299 if (device_property_read_bool(dev, "no-sdio"))
300 host->caps2 |= MMC_CAP2_NO_SDIO;
301 if (device_property_read_bool(dev, "no-sd"))
302 host->caps2 |= MMC_CAP2_NO_SD;
303 if (device_property_read_bool(dev, "no-mmc"))
304 host->caps2 |= MMC_CAP2_NO_MMC;
306 /* Must be after "non-removable" check */
307 if (device_property_read_u32(dev, "fixed-emmc-driver-type", &drv_type) == 0) {
308 if (host->caps & MMC_CAP_NONREMOVABLE)
309 host->fixed_drv_type = drv_type;
311 dev_err(host->parent,
312 "can't use fixed driver type, media is removable\n");
315 host->dsr_req = !device_property_read_u32(dev, "dsr", &host->dsr);
316 if (host->dsr_req && (host->dsr & ~0xffff)) {
317 dev_err(host->parent,
318 "device tree specified broken value for DSR: 0x%x, ignoring\n",
323 device_property_read_u32(dev, "post-power-on-delay-ms",
324 &host->ios.power_delay_ms);
326 return mmc_pwrseq_alloc(host);
329 EXPORT_SYMBOL(mmc_of_parse);
332 * mmc_of_parse_voltage - return mask of supported voltages
333 * @np: The device node need to be parsed.
334 * @mask: mask of voltages available for MMC/SD/SDIO
336 * Parse the "voltage-ranges" DT property, returning zero if it is not
337 * found, negative errno if the voltage-range specification is invalid,
338 * or one if the voltage-range is specified and successfully parsed.
340 int mmc_of_parse_voltage(struct device_node *np, u32 *mask)
342 const u32 *voltage_ranges;
345 voltage_ranges = of_get_property(np, "voltage-ranges", &num_ranges);
346 if (!voltage_ranges) {
347 pr_debug("%pOF: voltage-ranges unspecified\n", np);
350 num_ranges = num_ranges / sizeof(*voltage_ranges) / 2;
352 pr_err("%pOF: voltage-ranges empty\n", np);
356 for (i = 0; i < num_ranges; i++) {
360 ocr_mask = mmc_vddrange_to_ocrmask(
361 be32_to_cpu(voltage_ranges[j]),
362 be32_to_cpu(voltage_ranges[j + 1]));
364 pr_err("%pOF: voltage-range #%d is invalid\n",
373 EXPORT_SYMBOL(mmc_of_parse_voltage);
376 * mmc_alloc_host - initialise the per-host structure.
377 * @extra: sizeof private data structure
378 * @dev: pointer to host device model structure
380 * Initialise the per-host structure.
382 struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
385 struct mmc_host *host;
387 host = kzalloc(sizeof(struct mmc_host) + extra, GFP_KERNEL);
391 /* scanning will be enabled when we're ready */
392 host->rescan_disable = 1;
394 err = ida_simple_get(&mmc_host_ida, 0, 0, GFP_KERNEL);
402 dev_set_name(&host->class_dev, "mmc%d", host->index);
405 host->class_dev.parent = dev;
406 host->class_dev.class = &mmc_host_class;
407 device_initialize(&host->class_dev);
408 device_enable_async_suspend(&host->class_dev);
410 if (mmc_gpio_alloc(host)) {
411 put_device(&host->class_dev);
415 spin_lock_init(&host->lock);
416 init_waitqueue_head(&host->wq);
417 INIT_DELAYED_WORK(&host->detect, mmc_rescan);
418 INIT_DELAYED_WORK(&host->sdio_irq_work, sdio_irq_work);
419 timer_setup(&host->retune_timer, mmc_retune_timer, 0);
422 * By default, hosts do not support SGIO or large requests.
423 * They have to set these according to their abilities.
426 host->max_seg_size = PAGE_SIZE;
428 host->max_req_size = PAGE_SIZE;
429 host->max_blk_size = 512;
430 host->max_blk_count = PAGE_SIZE / 512;
432 host->fixed_drv_type = -EINVAL;
433 host->ios.power_delay_ms = 10;
438 EXPORT_SYMBOL(mmc_alloc_host);
441 * mmc_add_host - initialise host hardware
444 * Register the host with the driver model. The host must be
445 * prepared to start servicing requests before this function
448 int mmc_add_host(struct mmc_host *host)
452 WARN_ON((host->caps & MMC_CAP_SDIO_IRQ) &&
453 !host->ops->enable_sdio_irq);
455 err = device_add(&host->class_dev);
459 led_trigger_register_simple(dev_name(&host->class_dev), &host->led);
461 #ifdef CONFIG_DEBUG_FS
462 mmc_add_host_debugfs(host);
465 mmc_start_host(host);
466 mmc_register_pm_notifier(host);
471 EXPORT_SYMBOL(mmc_add_host);
474 * mmc_remove_host - remove host hardware
477 * Unregister and remove all cards associated with this host,
478 * and power down the MMC bus. No new requests will be issued
479 * after this function has returned.
481 void mmc_remove_host(struct mmc_host *host)
483 mmc_unregister_pm_notifier(host);
486 #ifdef CONFIG_DEBUG_FS
487 mmc_remove_host_debugfs(host);
490 device_del(&host->class_dev);
492 led_trigger_unregister_simple(host->led);
495 EXPORT_SYMBOL(mmc_remove_host);
498 * mmc_free_host - free the host structure
501 * Free the host once all references to it have been dropped.
503 void mmc_free_host(struct mmc_host *host)
505 mmc_pwrseq_free(host);
506 put_device(&host->class_dev);
509 EXPORT_SYMBOL(mmc_free_host);