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1/*
2 * linux/drivers/mmc/core/host.c
3 *
4 * Copyright (C) 2003 Russell King, All Rights Reserved.
5 * Copyright (C) 2007-2008 Pierre Ossman
6 * Copyright (C) 2010 Linus Walleij
7 *
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>
18#include <linux/of.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
25#include <linux/mmc/host.h>
26#include <linux/mmc/card.h>
27#include <linux/mmc/slot-gpio.h>
28
29#include "core.h"
30#include "host.h"
31#include "slot-gpio.h"
32#include "pwrseq.h"
33
34#define cls_dev_to_mmc_host(d) container_of(d, struct mmc_host, class_dev)
35
36static DEFINE_IDR(mmc_host_idr);
37static DEFINE_SPINLOCK(mmc_host_lock);
38
39static void mmc_host_classdev_release(struct device *dev)
40{
41 struct mmc_host *host = cls_dev_to_mmc_host(dev);
42 spin_lock(&mmc_host_lock);
43 idr_remove(&mmc_host_idr, host->index);
44 spin_unlock(&mmc_host_lock);
45 kfree(host);
46}
47
48static struct class mmc_host_class = {
49 .name = "mmc_host",
50 .dev_release = mmc_host_classdev_release,
51};
52
53int mmc_register_host_class(void)
54{
55 return class_register(&mmc_host_class);
56}
57
58void mmc_unregister_host_class(void)
59{
60 class_unregister(&mmc_host_class);
61}
62
63void mmc_retune_enable(struct mmc_host *host)
64{
65 host->can_retune = 1;
66 if (host->retune_period)
67 mod_timer(&host->retune_timer,
68 jiffies + host->retune_period * HZ);
69}
70
71void mmc_retune_disable(struct mmc_host *host)
72{
73 host->can_retune = 0;
74 del_timer_sync(&host->retune_timer);
75 host->retune_now = 0;
76 host->need_retune = 0;
77}
78
79void mmc_retune_timer_stop(struct mmc_host *host)
80{
81 del_timer_sync(&host->retune_timer);
82}
83EXPORT_SYMBOL(mmc_retune_timer_stop);
84
85void mmc_retune_hold(struct mmc_host *host)
86{
87 if (!host->hold_retune)
88 host->retune_now = 1;
89 host->hold_retune += 1;
90}
91
92void mmc_retune_release(struct mmc_host *host)
93{
94 if (host->hold_retune)
95 host->hold_retune -= 1;
96 else
97 WARN_ON(1);
98}
99
100int mmc_retune(struct mmc_host *host)
101{
102 bool return_to_hs400 = false;
103 int err;
104
105 if (host->retune_now)
106 host->retune_now = 0;
107 else
108 return 0;
109
110 if (!host->need_retune || host->doing_retune || !host->card)
111 return 0;
112
113 host->need_retune = 0;
114
115 host->doing_retune = 1;
116
117 if (host->ios.timing == MMC_TIMING_MMC_HS400) {
118 err = mmc_hs400_to_hs200(host->card);
119 if (err)
120 goto out;
121
122 return_to_hs400 = true;
123
124 if (host->ops->prepare_hs400_tuning)
125 host->ops->prepare_hs400_tuning(host, &host->ios);
126 }
127
128 err = mmc_execute_tuning(host->card);
129 if (err)
130 goto out;
131
132 if (return_to_hs400)
133 err = mmc_hs200_to_hs400(host->card);
134out:
135 host->doing_retune = 0;
136
137 return err;
138}
139
140static void mmc_retune_timer(unsigned long data)
141{
142 struct mmc_host *host = (struct mmc_host *)data;
143
144 mmc_retune_needed(host);
145}
146
147/**
148 * mmc_of_parse() - parse host's device-tree node
149 * @host: host whose node should be parsed.
150 *
151 * To keep the rest of the MMC subsystem unaware of whether DT has been
152 * used to to instantiate and configure this host instance or not, we
153 * parse the properties and set respective generic mmc-host flags and
154 * parameters.
155 */
156int mmc_of_parse(struct mmc_host *host)
157{
158 struct device_node *np;
159 u32 bus_width;
160 int ret;
161 bool cd_cap_invert, cd_gpio_invert = false;
162 bool ro_cap_invert, ro_gpio_invert = false;
163
164 if (!host->parent || !host->parent->of_node)
165 return 0;
166
167 np = host->parent->of_node;
168
169 /* "bus-width" is translated to MMC_CAP_*_BIT_DATA flags */
170 if (of_property_read_u32(np, "bus-width", &bus_width) < 0) {
171 dev_dbg(host->parent,
172 "\"bus-width\" property is missing, assuming 1 bit.\n");
173 bus_width = 1;
174 }
175
176 switch (bus_width) {
177 case 8:
178 host->caps |= MMC_CAP_8_BIT_DATA;
179 /* Hosts capable of 8-bit transfers can also do 4 bits */
180 case 4:
181 host->caps |= MMC_CAP_4_BIT_DATA;
182 break;
183 case 1:
184 break;
185 default:
186 dev_err(host->parent,
187 "Invalid \"bus-width\" value %u!\n", bus_width);
188 return -EINVAL;
189 }
190
191 /* f_max is obtained from the optional "max-frequency" property */
192 of_property_read_u32(np, "max-frequency", &host->f_max);
193
194 /*
195 * Configure CD and WP pins. They are both by default active low to
196 * match the SDHCI spec. If GPIOs are provided for CD and / or WP, the
197 * mmc-gpio helpers are used to attach, configure and use them. If
198 * polarity inversion is specified in DT, one of MMC_CAP2_CD_ACTIVE_HIGH
199 * and MMC_CAP2_RO_ACTIVE_HIGH capability-2 flags is set. If the
200 * "broken-cd" property is provided, the MMC_CAP_NEEDS_POLL capability
201 * is set. If the "non-removable" property is found, the
202 * MMC_CAP_NONREMOVABLE capability is set and no card-detection
203 * configuration is performed.
204 */
205
206 /* Parse Card Detection */
207 if (of_property_read_bool(np, "non-removable")) {
208 host->caps |= MMC_CAP_NONREMOVABLE;
209 } else {
210 cd_cap_invert = of_property_read_bool(np, "cd-inverted");
211
212 if (of_property_read_bool(np, "broken-cd"))
213 host->caps |= MMC_CAP_NEEDS_POLL;
214
215 ret = mmc_gpiod_request_cd(host, "cd", 0, true,
216 0, &cd_gpio_invert);
217 if (!ret)
218 dev_info(host->parent, "Got CD GPIO\n");
219 else if (ret != -ENOENT && ret != -ENOSYS)
220 return ret;
221
222 /*
223 * There are two ways to flag that the CD line is inverted:
224 * through the cd-inverted flag and by the GPIO line itself
225 * being inverted from the GPIO subsystem. This is a leftover
226 * from the times when the GPIO subsystem did not make it
227 * possible to flag a line as inverted.
228 *
229 * If the capability on the host AND the GPIO line are
230 * both inverted, the end result is that the CD line is
231 * not inverted.
232 */
233 if (cd_cap_invert ^ cd_gpio_invert)
234 host->caps2 |= MMC_CAP2_CD_ACTIVE_HIGH;
235 }
236
237 /* Parse Write Protection */
238 ro_cap_invert = of_property_read_bool(np, "wp-inverted");
239
240 ret = mmc_gpiod_request_ro(host, "wp", 0, false, 0, &ro_gpio_invert);
241 if (!ret)
242 dev_info(host->parent, "Got WP GPIO\n");
243 else if (ret != -ENOENT && ret != -ENOSYS)
244 return ret;
245
246 if (of_property_read_bool(np, "disable-wp"))
247 host->caps2 |= MMC_CAP2_NO_WRITE_PROTECT;
248
249 /* See the comment on CD inversion above */
250 if (ro_cap_invert ^ ro_gpio_invert)
251 host->caps2 |= MMC_CAP2_RO_ACTIVE_HIGH;
252
253 if (of_property_read_bool(np, "cap-sd-highspeed"))
254 host->caps |= MMC_CAP_SD_HIGHSPEED;
255 if (of_property_read_bool(np, "cap-mmc-highspeed"))
256 host->caps |= MMC_CAP_MMC_HIGHSPEED;
257 if (of_property_read_bool(np, "sd-uhs-sdr12"))
258 host->caps |= MMC_CAP_UHS_SDR12;
259 if (of_property_read_bool(np, "sd-uhs-sdr25"))
260 host->caps |= MMC_CAP_UHS_SDR25;
261 if (of_property_read_bool(np, "sd-uhs-sdr50"))
262 host->caps |= MMC_CAP_UHS_SDR50;
263 if (of_property_read_bool(np, "sd-uhs-sdr104"))
264 host->caps |= MMC_CAP_UHS_SDR104;
265 if (of_property_read_bool(np, "sd-uhs-ddr50"))
266 host->caps |= MMC_CAP_UHS_DDR50;
267 if (of_property_read_bool(np, "cap-power-off-card"))
268 host->caps |= MMC_CAP_POWER_OFF_CARD;
269 if (of_property_read_bool(np, "cap-mmc-hw-reset"))
270 host->caps |= MMC_CAP_HW_RESET;
271 if (of_property_read_bool(np, "cap-sdio-irq"))
272 host->caps |= MMC_CAP_SDIO_IRQ;
273 if (of_property_read_bool(np, "full-pwr-cycle"))
274 host->caps2 |= MMC_CAP2_FULL_PWR_CYCLE;
275 if (of_property_read_bool(np, "keep-power-in-suspend"))
276 host->pm_caps |= MMC_PM_KEEP_POWER;
277 if (of_property_read_bool(np, "wakeup-source") ||
278 of_property_read_bool(np, "enable-sdio-wakeup")) /* legacy */
279 host->pm_caps |= MMC_PM_WAKE_SDIO_IRQ;
280 if (of_property_read_bool(np, "mmc-ddr-1_8v"))
281 host->caps |= MMC_CAP_1_8V_DDR;
282 if (of_property_read_bool(np, "mmc-ddr-1_2v"))
283 host->caps |= MMC_CAP_1_2V_DDR;
284 if (of_property_read_bool(np, "mmc-hs200-1_8v"))
285 host->caps2 |= MMC_CAP2_HS200_1_8V_SDR;
286 if (of_property_read_bool(np, "mmc-hs200-1_2v"))
287 host->caps2 |= MMC_CAP2_HS200_1_2V_SDR;
288 if (of_property_read_bool(np, "mmc-hs400-1_8v"))
289 host->caps2 |= MMC_CAP2_HS400_1_8V | MMC_CAP2_HS200_1_8V_SDR;
290 if (of_property_read_bool(np, "mmc-hs400-1_2v"))
291 host->caps2 |= MMC_CAP2_HS400_1_2V | MMC_CAP2_HS200_1_2V_SDR;
292
293 host->dsr_req = !of_property_read_u32(np, "dsr", &host->dsr);
294 if (host->dsr_req && (host->dsr & ~0xffff)) {
295 dev_err(host->parent,
296 "device tree specified broken value for DSR: 0x%x, ignoring\n",
297 host->dsr);
298 host->dsr_req = 0;
299 }
300
301 return mmc_pwrseq_alloc(host);
302}
303
304EXPORT_SYMBOL(mmc_of_parse);
305
306/**
307 * mmc_alloc_host - initialise the per-host structure.
308 * @extra: sizeof private data structure
309 * @dev: pointer to host device model structure
310 *
311 * Initialise the per-host structure.
312 */
313struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
314{
315 int err;
316 struct mmc_host *host;
317
318 host = kzalloc(sizeof(struct mmc_host) + extra, GFP_KERNEL);
319 if (!host)
320 return NULL;
321
322 /* scanning will be enabled when we're ready */
323 host->rescan_disable = 1;
324 idr_preload(GFP_KERNEL);
325 spin_lock(&mmc_host_lock);
326 err = idr_alloc(&mmc_host_idr, host, 0, 0, GFP_NOWAIT);
327 if (err >= 0)
328 host->index = err;
329 spin_unlock(&mmc_host_lock);
330 idr_preload_end();
331 if (err < 0) {
332 kfree(host);
333 return NULL;
334 }
335
336 dev_set_name(&host->class_dev, "mmc%d", host->index);
337
338 host->parent = dev;
339 host->class_dev.parent = dev;
340 host->class_dev.class = &mmc_host_class;
341 device_initialize(&host->class_dev);
342 device_enable_async_suspend(&host->class_dev);
343
344 if (mmc_gpio_alloc(host)) {
345 put_device(&host->class_dev);
346 return NULL;
347 }
348
349 spin_lock_init(&host->lock);
350 init_waitqueue_head(&host->wq);
351 INIT_DELAYED_WORK(&host->detect, mmc_rescan);
352 setup_timer(&host->retune_timer, mmc_retune_timer, (unsigned long)host);
353
354 /*
355 * By default, hosts do not support SGIO or large requests.
356 * They have to set these according to their abilities.
357 */
358 host->max_segs = 1;
359 host->max_seg_size = PAGE_SIZE;
360
361 host->max_req_size = PAGE_SIZE;
362 host->max_blk_size = 512;
363 host->max_blk_count = PAGE_SIZE / 512;
364
365 return host;
366}
367
368EXPORT_SYMBOL(mmc_alloc_host);
369
370/**
371 * mmc_add_host - initialise host hardware
372 * @host: mmc host
373 *
374 * Register the host with the driver model. The host must be
375 * prepared to start servicing requests before this function
376 * completes.
377 */
378int mmc_add_host(struct mmc_host *host)
379{
380 int err;
381
382 WARN_ON((host->caps & MMC_CAP_SDIO_IRQ) &&
383 !host->ops->enable_sdio_irq);
384
385 err = device_add(&host->class_dev);
386 if (err)
387 return err;
388
389 led_trigger_register_simple(dev_name(&host->class_dev), &host->led);
390
391#ifdef CONFIG_DEBUG_FS
392 mmc_add_host_debugfs(host);
393#endif
394
395 mmc_start_host(host);
396 mmc_register_pm_notifier(host);
397
398 return 0;
399}
400
401EXPORT_SYMBOL(mmc_add_host);
402
403/**
404 * mmc_remove_host - remove host hardware
405 * @host: mmc host
406 *
407 * Unregister and remove all cards associated with this host,
408 * and power down the MMC bus. No new requests will be issued
409 * after this function has returned.
410 */
411void mmc_remove_host(struct mmc_host *host)
412{
413 mmc_unregister_pm_notifier(host);
414 mmc_stop_host(host);
415
416#ifdef CONFIG_DEBUG_FS
417 mmc_remove_host_debugfs(host);
418#endif
419
420 device_del(&host->class_dev);
421
422 led_trigger_unregister_simple(host->led);
423}
424
425EXPORT_SYMBOL(mmc_remove_host);
426
427/**
428 * mmc_free_host - free the host structure
429 * @host: mmc host
430 *
431 * Free the host once all references to it have been dropped.
432 */
433void mmc_free_host(struct mmc_host *host)
434{
435 mmc_pwrseq_free(host);
436 put_device(&host->class_dev);
437}
438
439EXPORT_SYMBOL(mmc_free_host);
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/pm_wakeup.h>
19#include <linux/export.h>
20#include <linux/leds.h>
21#include <linux/slab.h>
22
23#include <linux/mmc/host.h>
24#include <linux/mmc/card.h>
25#include <linux/mmc/slot-gpio.h>
26
27#include "core.h"
28#include "crypto.h"
29#include "host.h"
30#include "slot-gpio.h"
31#include "pwrseq.h"
32#include "sdio_ops.h"
33
34#define cls_dev_to_mmc_host(d) container_of(d, struct mmc_host, class_dev)
35
36static DEFINE_IDA(mmc_host_ida);
37
38#ifdef CONFIG_PM_SLEEP
39static int mmc_host_class_prepare(struct device *dev)
40{
41 struct mmc_host *host = cls_dev_to_mmc_host(dev);
42
43 /*
44 * It's safe to access the bus_ops pointer, as both userspace and the
45 * workqueue for detecting cards are frozen at this point.
46 */
47 if (!host->bus_ops)
48 return 0;
49
50 /* Validate conditions for system suspend. */
51 if (host->bus_ops->pre_suspend)
52 return host->bus_ops->pre_suspend(host);
53
54 return 0;
55}
56
57static void mmc_host_class_complete(struct device *dev)
58{
59 struct mmc_host *host = cls_dev_to_mmc_host(dev);
60
61 _mmc_detect_change(host, 0, false);
62}
63
64static const struct dev_pm_ops mmc_host_class_dev_pm_ops = {
65 .prepare = mmc_host_class_prepare,
66 .complete = mmc_host_class_complete,
67};
68
69#define MMC_HOST_CLASS_DEV_PM_OPS (&mmc_host_class_dev_pm_ops)
70#else
71#define MMC_HOST_CLASS_DEV_PM_OPS NULL
72#endif
73
74static void mmc_host_classdev_release(struct device *dev)
75{
76 struct mmc_host *host = cls_dev_to_mmc_host(dev);
77 wakeup_source_unregister(host->ws);
78 if (of_alias_get_id(host->parent->of_node, "mmc") < 0)
79 ida_simple_remove(&mmc_host_ida, host->index);
80 kfree(host);
81}
82
83static struct class mmc_host_class = {
84 .name = "mmc_host",
85 .dev_release = mmc_host_classdev_release,
86 .pm = MMC_HOST_CLASS_DEV_PM_OPS,
87};
88
89int mmc_register_host_class(void)
90{
91 return class_register(&mmc_host_class);
92}
93
94void mmc_unregister_host_class(void)
95{
96 class_unregister(&mmc_host_class);
97}
98
99void mmc_retune_enable(struct mmc_host *host)
100{
101 host->can_retune = 1;
102 if (host->retune_period)
103 mod_timer(&host->retune_timer,
104 jiffies + host->retune_period * HZ);
105}
106
107/*
108 * Pause re-tuning for a small set of operations. The pause begins after the
109 * next command and after first doing re-tuning.
110 */
111void mmc_retune_pause(struct mmc_host *host)
112{
113 if (!host->retune_paused) {
114 host->retune_paused = 1;
115 mmc_retune_needed(host);
116 mmc_retune_hold(host);
117 }
118}
119EXPORT_SYMBOL(mmc_retune_pause);
120
121void mmc_retune_unpause(struct mmc_host *host)
122{
123 if (host->retune_paused) {
124 host->retune_paused = 0;
125 mmc_retune_release(host);
126 }
127}
128EXPORT_SYMBOL(mmc_retune_unpause);
129
130void mmc_retune_disable(struct mmc_host *host)
131{
132 mmc_retune_unpause(host);
133 host->can_retune = 0;
134 del_timer_sync(&host->retune_timer);
135 host->retune_now = 0;
136 host->need_retune = 0;
137}
138
139void mmc_retune_timer_stop(struct mmc_host *host)
140{
141 del_timer_sync(&host->retune_timer);
142}
143EXPORT_SYMBOL(mmc_retune_timer_stop);
144
145void mmc_retune_hold(struct mmc_host *host)
146{
147 if (!host->hold_retune)
148 host->retune_now = 1;
149 host->hold_retune += 1;
150}
151
152void mmc_retune_release(struct mmc_host *host)
153{
154 if (host->hold_retune)
155 host->hold_retune -= 1;
156 else
157 WARN_ON(1);
158}
159EXPORT_SYMBOL(mmc_retune_release);
160
161int mmc_retune(struct mmc_host *host)
162{
163 bool return_to_hs400 = false;
164 int err;
165
166 if (host->retune_now)
167 host->retune_now = 0;
168 else
169 return 0;
170
171 if (!host->need_retune || host->doing_retune || !host->card)
172 return 0;
173
174 host->need_retune = 0;
175
176 host->doing_retune = 1;
177
178 if (host->ios.timing == MMC_TIMING_MMC_HS400) {
179 err = mmc_hs400_to_hs200(host->card);
180 if (err)
181 goto out;
182
183 return_to_hs400 = true;
184 }
185
186 err = mmc_execute_tuning(host->card);
187 if (err)
188 goto out;
189
190 if (return_to_hs400)
191 err = mmc_hs200_to_hs400(host->card);
192out:
193 host->doing_retune = 0;
194
195 return err;
196}
197
198static void mmc_retune_timer(struct timer_list *t)
199{
200 struct mmc_host *host = from_timer(host, t, retune_timer);
201
202 mmc_retune_needed(host);
203}
204
205static void mmc_of_parse_timing_phase(struct device *dev, const char *prop,
206 struct mmc_clk_phase *phase)
207{
208 int degrees[2] = {0};
209 int rc;
210
211 rc = device_property_read_u32_array(dev, prop, degrees, 2);
212 phase->valid = !rc;
213 if (phase->valid) {
214 phase->in_deg = degrees[0];
215 phase->out_deg = degrees[1];
216 }
217}
218
219void
220mmc_of_parse_clk_phase(struct mmc_host *host, struct mmc_clk_phase_map *map)
221{
222 struct device *dev = host->parent;
223
224 mmc_of_parse_timing_phase(dev, "clk-phase-legacy",
225 &map->phase[MMC_TIMING_LEGACY]);
226 mmc_of_parse_timing_phase(dev, "clk-phase-mmc-hs",
227 &map->phase[MMC_TIMING_MMC_HS]);
228 mmc_of_parse_timing_phase(dev, "clk-phase-sd-hs",
229 &map->phase[MMC_TIMING_SD_HS]);
230 mmc_of_parse_timing_phase(dev, "clk-phase-uhs-sdr12",
231 &map->phase[MMC_TIMING_UHS_SDR12]);
232 mmc_of_parse_timing_phase(dev, "clk-phase-uhs-sdr25",
233 &map->phase[MMC_TIMING_UHS_SDR25]);
234 mmc_of_parse_timing_phase(dev, "clk-phase-uhs-sdr50",
235 &map->phase[MMC_TIMING_UHS_SDR50]);
236 mmc_of_parse_timing_phase(dev, "clk-phase-uhs-sdr104",
237 &map->phase[MMC_TIMING_UHS_SDR104]);
238 mmc_of_parse_timing_phase(dev, "clk-phase-uhs-ddr50",
239 &map->phase[MMC_TIMING_UHS_DDR50]);
240 mmc_of_parse_timing_phase(dev, "clk-phase-mmc-ddr52",
241 &map->phase[MMC_TIMING_MMC_DDR52]);
242 mmc_of_parse_timing_phase(dev, "clk-phase-mmc-hs200",
243 &map->phase[MMC_TIMING_MMC_HS200]);
244 mmc_of_parse_timing_phase(dev, "clk-phase-mmc-hs400",
245 &map->phase[MMC_TIMING_MMC_HS400]);
246}
247EXPORT_SYMBOL(mmc_of_parse_clk_phase);
248
249/**
250 * mmc_of_parse() - parse host's device properties
251 * @host: host whose properties should be parsed.
252 *
253 * To keep the rest of the MMC subsystem unaware of whether DT has been
254 * used to to instantiate and configure this host instance or not, we
255 * parse the properties and set respective generic mmc-host flags and
256 * parameters.
257 */
258int mmc_of_parse(struct mmc_host *host)
259{
260 struct device *dev = host->parent;
261 u32 bus_width, drv_type, cd_debounce_delay_ms;
262 int ret;
263
264 if (!dev || !dev_fwnode(dev))
265 return 0;
266
267 /* "bus-width" is translated to MMC_CAP_*_BIT_DATA flags */
268 if (device_property_read_u32(dev, "bus-width", &bus_width) < 0) {
269 dev_dbg(host->parent,
270 "\"bus-width\" property is missing, assuming 1 bit.\n");
271 bus_width = 1;
272 }
273
274 switch (bus_width) {
275 case 8:
276 host->caps |= MMC_CAP_8_BIT_DATA;
277 fallthrough; /* Hosts capable of 8-bit can also do 4 bits */
278 case 4:
279 host->caps |= MMC_CAP_4_BIT_DATA;
280 break;
281 case 1:
282 break;
283 default:
284 dev_err(host->parent,
285 "Invalid \"bus-width\" value %u!\n", bus_width);
286 return -EINVAL;
287 }
288
289 /* f_max is obtained from the optional "max-frequency" property */
290 device_property_read_u32(dev, "max-frequency", &host->f_max);
291
292 /*
293 * Configure CD and WP pins. They are both by default active low to
294 * match the SDHCI spec. If GPIOs are provided for CD and / or WP, the
295 * mmc-gpio helpers are used to attach, configure and use them. If
296 * polarity inversion is specified in DT, one of MMC_CAP2_CD_ACTIVE_HIGH
297 * and MMC_CAP2_RO_ACTIVE_HIGH capability-2 flags is set. If the
298 * "broken-cd" property is provided, the MMC_CAP_NEEDS_POLL capability
299 * is set. If the "non-removable" property is found, the
300 * MMC_CAP_NONREMOVABLE capability is set and no card-detection
301 * configuration is performed.
302 */
303
304 /* Parse Card Detection */
305
306 if (device_property_read_bool(dev, "non-removable")) {
307 host->caps |= MMC_CAP_NONREMOVABLE;
308 } else {
309 if (device_property_read_bool(dev, "cd-inverted"))
310 host->caps2 |= MMC_CAP2_CD_ACTIVE_HIGH;
311
312 if (device_property_read_u32(dev, "cd-debounce-delay-ms",
313 &cd_debounce_delay_ms))
314 cd_debounce_delay_ms = 200;
315
316 if (device_property_read_bool(dev, "broken-cd"))
317 host->caps |= MMC_CAP_NEEDS_POLL;
318
319 ret = mmc_gpiod_request_cd(host, "cd", 0, false,
320 cd_debounce_delay_ms * 1000);
321 if (!ret)
322 dev_info(host->parent, "Got CD GPIO\n");
323 else if (ret != -ENOENT && ret != -ENOSYS)
324 return ret;
325 }
326
327 /* Parse Write Protection */
328
329 if (device_property_read_bool(dev, "wp-inverted"))
330 host->caps2 |= MMC_CAP2_RO_ACTIVE_HIGH;
331
332 ret = mmc_gpiod_request_ro(host, "wp", 0, 0);
333 if (!ret)
334 dev_info(host->parent, "Got WP GPIO\n");
335 else if (ret != -ENOENT && ret != -ENOSYS)
336 return ret;
337
338 if (device_property_read_bool(dev, "disable-wp"))
339 host->caps2 |= MMC_CAP2_NO_WRITE_PROTECT;
340
341 if (device_property_read_bool(dev, "cap-sd-highspeed"))
342 host->caps |= MMC_CAP_SD_HIGHSPEED;
343 if (device_property_read_bool(dev, "cap-mmc-highspeed"))
344 host->caps |= MMC_CAP_MMC_HIGHSPEED;
345 if (device_property_read_bool(dev, "sd-uhs-sdr12"))
346 host->caps |= MMC_CAP_UHS_SDR12;
347 if (device_property_read_bool(dev, "sd-uhs-sdr25"))
348 host->caps |= MMC_CAP_UHS_SDR25;
349 if (device_property_read_bool(dev, "sd-uhs-sdr50"))
350 host->caps |= MMC_CAP_UHS_SDR50;
351 if (device_property_read_bool(dev, "sd-uhs-sdr104"))
352 host->caps |= MMC_CAP_UHS_SDR104;
353 if (device_property_read_bool(dev, "sd-uhs-ddr50"))
354 host->caps |= MMC_CAP_UHS_DDR50;
355 if (device_property_read_bool(dev, "cap-power-off-card"))
356 host->caps |= MMC_CAP_POWER_OFF_CARD;
357 if (device_property_read_bool(dev, "cap-mmc-hw-reset"))
358 host->caps |= MMC_CAP_HW_RESET;
359 if (device_property_read_bool(dev, "cap-sdio-irq"))
360 host->caps |= MMC_CAP_SDIO_IRQ;
361 if (device_property_read_bool(dev, "full-pwr-cycle"))
362 host->caps2 |= MMC_CAP2_FULL_PWR_CYCLE;
363 if (device_property_read_bool(dev, "full-pwr-cycle-in-suspend"))
364 host->caps2 |= MMC_CAP2_FULL_PWR_CYCLE_IN_SUSPEND;
365 if (device_property_read_bool(dev, "keep-power-in-suspend"))
366 host->pm_caps |= MMC_PM_KEEP_POWER;
367 if (device_property_read_bool(dev, "wakeup-source") ||
368 device_property_read_bool(dev, "enable-sdio-wakeup")) /* legacy */
369 host->pm_caps |= MMC_PM_WAKE_SDIO_IRQ;
370 if (device_property_read_bool(dev, "mmc-ddr-3_3v"))
371 host->caps |= MMC_CAP_3_3V_DDR;
372 if (device_property_read_bool(dev, "mmc-ddr-1_8v"))
373 host->caps |= MMC_CAP_1_8V_DDR;
374 if (device_property_read_bool(dev, "mmc-ddr-1_2v"))
375 host->caps |= MMC_CAP_1_2V_DDR;
376 if (device_property_read_bool(dev, "mmc-hs200-1_8v"))
377 host->caps2 |= MMC_CAP2_HS200_1_8V_SDR;
378 if (device_property_read_bool(dev, "mmc-hs200-1_2v"))
379 host->caps2 |= MMC_CAP2_HS200_1_2V_SDR;
380 if (device_property_read_bool(dev, "mmc-hs400-1_8v"))
381 host->caps2 |= MMC_CAP2_HS400_1_8V | MMC_CAP2_HS200_1_8V_SDR;
382 if (device_property_read_bool(dev, "mmc-hs400-1_2v"))
383 host->caps2 |= MMC_CAP2_HS400_1_2V | MMC_CAP2_HS200_1_2V_SDR;
384 if (device_property_read_bool(dev, "mmc-hs400-enhanced-strobe"))
385 host->caps2 |= MMC_CAP2_HS400_ES;
386 if (device_property_read_bool(dev, "no-sdio"))
387 host->caps2 |= MMC_CAP2_NO_SDIO;
388 if (device_property_read_bool(dev, "no-sd"))
389 host->caps2 |= MMC_CAP2_NO_SD;
390 if (device_property_read_bool(dev, "no-mmc"))
391 host->caps2 |= MMC_CAP2_NO_MMC;
392 if (device_property_read_bool(dev, "no-mmc-hs400"))
393 host->caps2 &= ~(MMC_CAP2_HS400_1_8V | MMC_CAP2_HS400_1_2V |
394 MMC_CAP2_HS400_ES);
395
396 /* Must be after "non-removable" check */
397 if (device_property_read_u32(dev, "fixed-emmc-driver-type", &drv_type) == 0) {
398 if (host->caps & MMC_CAP_NONREMOVABLE)
399 host->fixed_drv_type = drv_type;
400 else
401 dev_err(host->parent,
402 "can't use fixed driver type, media is removable\n");
403 }
404
405 host->dsr_req = !device_property_read_u32(dev, "dsr", &host->dsr);
406 if (host->dsr_req && (host->dsr & ~0xffff)) {
407 dev_err(host->parent,
408 "device tree specified broken value for DSR: 0x%x, ignoring\n",
409 host->dsr);
410 host->dsr_req = 0;
411 }
412
413 device_property_read_u32(dev, "post-power-on-delay-ms",
414 &host->ios.power_delay_ms);
415
416 return mmc_pwrseq_alloc(host);
417}
418
419EXPORT_SYMBOL(mmc_of_parse);
420
421/**
422 * mmc_of_parse_voltage - return mask of supported voltages
423 * @host: host whose properties should be parsed.
424 * @mask: mask of voltages available for MMC/SD/SDIO
425 *
426 * Parse the "voltage-ranges" property, returning zero if it is not
427 * found, negative errno if the voltage-range specification is invalid,
428 * or one if the voltage-range is specified and successfully parsed.
429 */
430int mmc_of_parse_voltage(struct mmc_host *host, u32 *mask)
431{
432 const char *prop = "voltage-ranges";
433 struct device *dev = host->parent;
434 u32 *voltage_ranges;
435 int num_ranges, i;
436 int ret;
437
438 if (!device_property_present(dev, prop)) {
439 dev_dbg(dev, "%s unspecified\n", prop);
440 return 0;
441 }
442
443 ret = device_property_count_u32(dev, prop);
444 if (ret < 0)
445 return ret;
446
447 num_ranges = ret / 2;
448 if (!num_ranges) {
449 dev_err(dev, "%s empty\n", prop);
450 return -EINVAL;
451 }
452
453 voltage_ranges = kcalloc(2 * num_ranges, sizeof(*voltage_ranges), GFP_KERNEL);
454 if (!voltage_ranges)
455 return -ENOMEM;
456
457 ret = device_property_read_u32_array(dev, prop, voltage_ranges, 2 * num_ranges);
458 if (ret) {
459 kfree(voltage_ranges);
460 return ret;
461 }
462
463 for (i = 0; i < num_ranges; i++) {
464 const int j = i * 2;
465 u32 ocr_mask;
466
467 ocr_mask = mmc_vddrange_to_ocrmask(voltage_ranges[j + 0],
468 voltage_ranges[j + 1]);
469 if (!ocr_mask) {
470 dev_err(dev, "range #%d in %s is invalid\n", i, prop);
471 kfree(voltage_ranges);
472 return -EINVAL;
473 }
474 *mask |= ocr_mask;
475 }
476
477 kfree(voltage_ranges);
478
479 return 1;
480}
481EXPORT_SYMBOL(mmc_of_parse_voltage);
482
483/**
484 * mmc_first_nonreserved_index() - get the first index that is not reserved
485 */
486static int mmc_first_nonreserved_index(void)
487{
488 int max;
489
490 max = of_alias_get_highest_id("mmc");
491 if (max < 0)
492 return 0;
493
494 return max + 1;
495}
496
497/**
498 * mmc_alloc_host - initialise the per-host structure.
499 * @extra: sizeof private data structure
500 * @dev: pointer to host device model structure
501 *
502 * Initialise the per-host structure.
503 */
504struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
505{
506 int index;
507 struct mmc_host *host;
508 int alias_id, min_idx, max_idx;
509
510 host = kzalloc(sizeof(struct mmc_host) + extra, GFP_KERNEL);
511 if (!host)
512 return NULL;
513
514 /* scanning will be enabled when we're ready */
515 host->rescan_disable = 1;
516
517 alias_id = of_alias_get_id(dev->of_node, "mmc");
518 if (alias_id >= 0) {
519 index = alias_id;
520 } else {
521 min_idx = mmc_first_nonreserved_index();
522 max_idx = 0;
523
524 index = ida_simple_get(&mmc_host_ida, min_idx, max_idx, GFP_KERNEL);
525 if (index < 0) {
526 kfree(host);
527 return NULL;
528 }
529 }
530
531 host->index = index;
532
533 dev_set_name(&host->class_dev, "mmc%d", host->index);
534 host->ws = wakeup_source_register(NULL, dev_name(&host->class_dev));
535
536 host->parent = dev;
537 host->class_dev.parent = dev;
538 host->class_dev.class = &mmc_host_class;
539 device_initialize(&host->class_dev);
540 device_enable_async_suspend(&host->class_dev);
541
542 if (mmc_gpio_alloc(host)) {
543 put_device(&host->class_dev);
544 return NULL;
545 }
546
547 spin_lock_init(&host->lock);
548 init_waitqueue_head(&host->wq);
549 INIT_DELAYED_WORK(&host->detect, mmc_rescan);
550 INIT_DELAYED_WORK(&host->sdio_irq_work, sdio_irq_work);
551 timer_setup(&host->retune_timer, mmc_retune_timer, 0);
552
553 /*
554 * By default, hosts do not support SGIO or large requests.
555 * They have to set these according to their abilities.
556 */
557 host->max_segs = 1;
558 host->max_seg_size = PAGE_SIZE;
559
560 host->max_req_size = PAGE_SIZE;
561 host->max_blk_size = 512;
562 host->max_blk_count = PAGE_SIZE / 512;
563
564 host->fixed_drv_type = -EINVAL;
565 host->ios.power_delay_ms = 10;
566 host->ios.power_mode = MMC_POWER_UNDEFINED;
567
568 return host;
569}
570
571EXPORT_SYMBOL(mmc_alloc_host);
572
573/**
574 * mmc_add_host - initialise host hardware
575 * @host: mmc host
576 *
577 * Register the host with the driver model. The host must be
578 * prepared to start servicing requests before this function
579 * completes.
580 */
581int mmc_add_host(struct mmc_host *host)
582{
583 int err;
584
585 WARN_ON((host->caps & MMC_CAP_SDIO_IRQ) &&
586 !host->ops->enable_sdio_irq);
587
588 err = device_add(&host->class_dev);
589 if (err)
590 return err;
591
592 led_trigger_register_simple(dev_name(&host->class_dev), &host->led);
593
594#ifdef CONFIG_DEBUG_FS
595 mmc_add_host_debugfs(host);
596#endif
597
598 mmc_start_host(host);
599 return 0;
600}
601
602EXPORT_SYMBOL(mmc_add_host);
603
604/**
605 * mmc_remove_host - remove host hardware
606 * @host: mmc host
607 *
608 * Unregister and remove all cards associated with this host,
609 * and power down the MMC bus. No new requests will be issued
610 * after this function has returned.
611 */
612void mmc_remove_host(struct mmc_host *host)
613{
614 mmc_stop_host(host);
615
616#ifdef CONFIG_DEBUG_FS
617 mmc_remove_host_debugfs(host);
618#endif
619
620 device_del(&host->class_dev);
621
622 led_trigger_unregister_simple(host->led);
623}
624
625EXPORT_SYMBOL(mmc_remove_host);
626
627/**
628 * mmc_free_host - free the host structure
629 * @host: mmc host
630 *
631 * Free the host once all references to it have been dropped.
632 */
633void mmc_free_host(struct mmc_host *host)
634{
635 mmc_pwrseq_free(host);
636 put_device(&host->class_dev);
637}
638
639EXPORT_SYMBOL(mmc_free_host);