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[linux.git] / drivers / mmc / core / host.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  *  linux/drivers/mmc/core/host.c
4  *
5  *  Copyright (C) 2003 Russell King, All Rights Reserved.
6  *  Copyright (C) 2007-2008 Pierre Ossman
7  *  Copyright (C) 2010 Linus Walleij
8  *
9  *  MMC host class device management
10  */
11
12 #include <linux/device.h>
13 #include <linux/err.h>
14 #include <linux/idr.h>
15 #include <linux/of.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>
21
22 #include <linux/mmc/host.h>
23 #include <linux/mmc/card.h>
24 #include <linux/mmc/slot-gpio.h>
25
26 #include "core.h"
27 #include "host.h"
28 #include "slot-gpio.h"
29 #include "pwrseq.h"
30 #include "sdio_ops.h"
31
32 #define cls_dev_to_mmc_host(d)  container_of(d, struct mmc_host, class_dev)
33
34 static DEFINE_IDA(mmc_host_ida);
35
36 static void mmc_host_classdev_release(struct device *dev)
37 {
38         struct mmc_host *host = cls_dev_to_mmc_host(dev);
39         ida_simple_remove(&mmc_host_ida, host->index);
40         kfree(host);
41 }
42
43 static struct class mmc_host_class = {
44         .name           = "mmc_host",
45         .dev_release    = mmc_host_classdev_release,
46 };
47
48 int mmc_register_host_class(void)
49 {
50         return class_register(&mmc_host_class);
51 }
52
53 void mmc_unregister_host_class(void)
54 {
55         class_unregister(&mmc_host_class);
56 }
57
58 void mmc_retune_enable(struct mmc_host *host)
59 {
60         host->can_retune = 1;
61         if (host->retune_period)
62                 mod_timer(&host->retune_timer,
63                           jiffies + host->retune_period * HZ);
64 }
65
66 /*
67  * Pause re-tuning for a small set of operations.  The pause begins after the
68  * next command and after first doing re-tuning.
69  */
70 void mmc_retune_pause(struct mmc_host *host)
71 {
72         if (!host->retune_paused) {
73                 host->retune_paused = 1;
74                 mmc_retune_needed(host);
75                 mmc_retune_hold(host);
76         }
77 }
78 EXPORT_SYMBOL(mmc_retune_pause);
79
80 void mmc_retune_unpause(struct mmc_host *host)
81 {
82         if (host->retune_paused) {
83                 host->retune_paused = 0;
84                 mmc_retune_release(host);
85         }
86 }
87 EXPORT_SYMBOL(mmc_retune_unpause);
88
89 void mmc_retune_disable(struct mmc_host *host)
90 {
91         mmc_retune_unpause(host);
92         host->can_retune = 0;
93         del_timer_sync(&host->retune_timer);
94         host->retune_now = 0;
95         host->need_retune = 0;
96 }
97
98 void mmc_retune_timer_stop(struct mmc_host *host)
99 {
100         del_timer_sync(&host->retune_timer);
101 }
102 EXPORT_SYMBOL(mmc_retune_timer_stop);
103
104 void mmc_retune_hold(struct mmc_host *host)
105 {
106         if (!host->hold_retune)
107                 host->retune_now = 1;
108         host->hold_retune += 1;
109 }
110
111 void mmc_retune_release(struct mmc_host *host)
112 {
113         if (host->hold_retune)
114                 host->hold_retune -= 1;
115         else
116                 WARN_ON(1);
117 }
118 EXPORT_SYMBOL(mmc_retune_release);
119
120 int mmc_retune(struct mmc_host *host)
121 {
122         bool return_to_hs400 = false;
123         int err;
124
125         if (host->retune_now)
126                 host->retune_now = 0;
127         else
128                 return 0;
129
130         if (!host->need_retune || host->doing_retune || !host->card)
131                 return 0;
132
133         host->need_retune = 0;
134
135         host->doing_retune = 1;
136
137         if (host->ios.timing == MMC_TIMING_MMC_HS400) {
138                 err = mmc_hs400_to_hs200(host->card);
139                 if (err)
140                         goto out;
141
142                 return_to_hs400 = true;
143         }
144
145         err = mmc_execute_tuning(host->card);
146         if (err)
147                 goto out;
148
149         if (return_to_hs400)
150                 err = mmc_hs200_to_hs400(host->card);
151 out:
152         host->doing_retune = 0;
153
154         return err;
155 }
156
157 static void mmc_retune_timer(struct timer_list *t)
158 {
159         struct mmc_host *host = from_timer(host, t, retune_timer);
160
161         mmc_retune_needed(host);
162 }
163
164 /**
165  *      mmc_of_parse() - parse host's device-tree node
166  *      @host: host whose node should be parsed.
167  *
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
171  * parameters.
172  */
173 int mmc_of_parse(struct mmc_host *host)
174 {
175         struct device *dev = host->parent;
176         u32 bus_width, drv_type, cd_debounce_delay_ms;
177         int ret;
178
179         if (!dev || !dev_fwnode(dev))
180                 return 0;
181
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");
186                 bus_width = 1;
187         }
188
189         switch (bus_width) {
190         case 8:
191                 host->caps |= MMC_CAP_8_BIT_DATA;
192                 /* fall through - Hosts capable of 8-bit can also do 4 bits */
193         case 4:
194                 host->caps |= MMC_CAP_4_BIT_DATA;
195                 break;
196         case 1:
197                 break;
198         default:
199                 dev_err(host->parent,
200                         "Invalid \"bus-width\" value %u!\n", bus_width);
201                 return -EINVAL;
202         }
203
204         /* f_max is obtained from the optional "max-frequency" property */
205         device_property_read_u32(dev, "max-frequency", &host->f_max);
206
207         /*
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.
217          */
218
219         /* Parse Card Detection */
220
221         if (device_property_read_bool(dev, "non-removable")) {
222                 host->caps |= MMC_CAP_NONREMOVABLE;
223         } else {
224                 if (device_property_read_bool(dev, "cd-inverted"))
225                         host->caps2 |= MMC_CAP2_CD_ACTIVE_HIGH;
226
227                 if (device_property_read_u32(dev, "cd-debounce-delay-ms",
228                                              &cd_debounce_delay_ms))
229                         cd_debounce_delay_ms = 200;
230
231                 if (device_property_read_bool(dev, "broken-cd"))
232                         host->caps |= MMC_CAP_NEEDS_POLL;
233
234                 ret = mmc_gpiod_request_cd(host, "cd", 0, false,
235                                            cd_debounce_delay_ms * 1000);
236                 if (!ret)
237                         dev_info(host->parent, "Got CD GPIO\n");
238                 else if (ret != -ENOENT && ret != -ENOSYS)
239                         return ret;
240         }
241
242         /* Parse Write Protection */
243
244         if (device_property_read_bool(dev, "wp-inverted"))
245                 host->caps2 |= MMC_CAP2_RO_ACTIVE_HIGH;
246
247         ret = mmc_gpiod_request_ro(host, "wp", 0, 0);
248         if (!ret)
249                 dev_info(host->parent, "Got WP GPIO\n");
250         else if (ret != -ENOENT && ret != -ENOSYS)
251                 return ret;
252
253         if (device_property_read_bool(dev, "disable-wp"))
254                 host->caps2 |= MMC_CAP2_NO_WRITE_PROTECT;
255
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;
305
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;
310                 else
311                         dev_err(host->parent,
312                                 "can't use fixed driver type, media is removable\n");
313         }
314
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",
319                         host->dsr);
320                 host->dsr_req = 0;
321         }
322
323         device_property_read_u32(dev, "post-power-on-delay-ms",
324                                  &host->ios.power_delay_ms);
325
326         return mmc_pwrseq_alloc(host);
327 }
328
329 EXPORT_SYMBOL(mmc_of_parse);
330
331 /**
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
335  *
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.
339  */
340 int mmc_of_parse_voltage(struct device_node *np, u32 *mask)
341 {
342         const u32 *voltage_ranges;
343         int num_ranges, i;
344
345         voltage_ranges = of_get_property(np, "voltage-ranges", &num_ranges);
346         if (!voltage_ranges) {
347                 pr_debug("%pOF: voltage-ranges unspecified\n", np);
348                 return 0;
349         }
350         num_ranges = num_ranges / sizeof(*voltage_ranges) / 2;
351         if (!num_ranges) {
352                 pr_err("%pOF: voltage-ranges empty\n", np);
353                 return -EINVAL;
354         }
355
356         for (i = 0; i < num_ranges; i++) {
357                 const int j = i * 2;
358                 u32 ocr_mask;
359
360                 ocr_mask = mmc_vddrange_to_ocrmask(
361                                 be32_to_cpu(voltage_ranges[j]),
362                                 be32_to_cpu(voltage_ranges[j + 1]));
363                 if (!ocr_mask) {
364                         pr_err("%pOF: voltage-range #%d is invalid\n",
365                                 np, i);
366                         return -EINVAL;
367                 }
368                 *mask |= ocr_mask;
369         }
370
371         return 1;
372 }
373 EXPORT_SYMBOL(mmc_of_parse_voltage);
374
375 /**
376  *      mmc_alloc_host - initialise the per-host structure.
377  *      @extra: sizeof private data structure
378  *      @dev: pointer to host device model structure
379  *
380  *      Initialise the per-host structure.
381  */
382 struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
383 {
384         int err;
385         struct mmc_host *host;
386
387         host = kzalloc(sizeof(struct mmc_host) + extra, GFP_KERNEL);
388         if (!host)
389                 return NULL;
390
391         /* scanning will be enabled when we're ready */
392         host->rescan_disable = 1;
393
394         err = ida_simple_get(&mmc_host_ida, 0, 0, GFP_KERNEL);
395         if (err < 0) {
396                 kfree(host);
397                 return NULL;
398         }
399
400         host->index = err;
401
402         dev_set_name(&host->class_dev, "mmc%d", host->index);
403
404         host->parent = dev;
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);
409
410         if (mmc_gpio_alloc(host)) {
411                 put_device(&host->class_dev);
412                 return NULL;
413         }
414
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);
420
421         /*
422          * By default, hosts do not support SGIO or large requests.
423          * They have to set these according to their abilities.
424          */
425         host->max_segs = 1;
426         host->max_seg_size = PAGE_SIZE;
427
428         host->max_req_size = PAGE_SIZE;
429         host->max_blk_size = 512;
430         host->max_blk_count = PAGE_SIZE / 512;
431
432         host->fixed_drv_type = -EINVAL;
433         host->ios.power_delay_ms = 10;
434
435         return host;
436 }
437
438 EXPORT_SYMBOL(mmc_alloc_host);
439
440 /**
441  *      mmc_add_host - initialise host hardware
442  *      @host: mmc host
443  *
444  *      Register the host with the driver model. The host must be
445  *      prepared to start servicing requests before this function
446  *      completes.
447  */
448 int mmc_add_host(struct mmc_host *host)
449 {
450         int err;
451
452         WARN_ON((host->caps & MMC_CAP_SDIO_IRQ) &&
453                 !host->ops->enable_sdio_irq);
454
455         err = device_add(&host->class_dev);
456         if (err)
457                 return err;
458
459         led_trigger_register_simple(dev_name(&host->class_dev), &host->led);
460
461 #ifdef CONFIG_DEBUG_FS
462         mmc_add_host_debugfs(host);
463 #endif
464
465         mmc_start_host(host);
466         mmc_register_pm_notifier(host);
467
468         return 0;
469 }
470
471 EXPORT_SYMBOL(mmc_add_host);
472
473 /**
474  *      mmc_remove_host - remove host hardware
475  *      @host: mmc host
476  *
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.
480  */
481 void mmc_remove_host(struct mmc_host *host)
482 {
483         mmc_unregister_pm_notifier(host);
484         mmc_stop_host(host);
485
486 #ifdef CONFIG_DEBUG_FS
487         mmc_remove_host_debugfs(host);
488 #endif
489
490         device_del(&host->class_dev);
491
492         led_trigger_unregister_simple(host->led);
493 }
494
495 EXPORT_SYMBOL(mmc_remove_host);
496
497 /**
498  *      mmc_free_host - free the host structure
499  *      @host: mmc host
500  *
501  *      Free the host once all references to it have been dropped.
502  */
503 void mmc_free_host(struct mmc_host *host)
504 {
505         mmc_pwrseq_free(host);
506         put_device(&host->class_dev);
507 }
508
509 EXPORT_SYMBOL(mmc_free_host);