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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/pagemap.h>
19#include <linux/leds.h>
20#include <linux/slab.h>
21#include <linux/suspend.h>
22
23#include <linux/mmc/host.h>
24#include <linux/mmc/card.h>
25
26#include "core.h"
27#include "host.h"
28
29#define cls_dev_to_mmc_host(d) container_of(d, struct mmc_host, class_dev)
30
31static void mmc_host_classdev_release(struct device *dev)
32{
33 struct mmc_host *host = cls_dev_to_mmc_host(dev);
34 kfree(host);
35}
36
37static struct class mmc_host_class = {
38 .name = "mmc_host",
39 .dev_release = mmc_host_classdev_release,
40};
41
42int mmc_register_host_class(void)
43{
44 return class_register(&mmc_host_class);
45}
46
47void mmc_unregister_host_class(void)
48{
49 class_unregister(&mmc_host_class);
50}
51
52static DEFINE_IDR(mmc_host_idr);
53static DEFINE_SPINLOCK(mmc_host_lock);
54
55#ifdef CONFIG_MMC_CLKGATE
56
57/*
58 * Enabling clock gating will make the core call out to the host
59 * once up and once down when it performs a request or card operation
60 * intermingled in any fashion. The driver will see this through
61 * set_ios() operations with ios.clock field set to 0 to gate (disable)
62 * the block clock, and to the old frequency to enable it again.
63 */
64static void mmc_host_clk_gate_delayed(struct mmc_host *host)
65{
66 unsigned long tick_ns;
67 unsigned long freq = host->ios.clock;
68 unsigned long flags;
69
70 if (!freq) {
71 pr_debug("%s: frequency set to 0 in disable function, "
72 "this means the clock is already disabled.\n",
73 mmc_hostname(host));
74 return;
75 }
76 /*
77 * New requests may have appeared while we were scheduling,
78 * then there is no reason to delay the check before
79 * clk_disable().
80 */
81 spin_lock_irqsave(&host->clk_lock, flags);
82
83 /*
84 * Delay n bus cycles (at least 8 from MMC spec) before attempting
85 * to disable the MCI block clock. The reference count may have
86 * gone up again after this delay due to rescheduling!
87 */
88 if (!host->clk_requests) {
89 spin_unlock_irqrestore(&host->clk_lock, flags);
90 tick_ns = DIV_ROUND_UP(1000000000, freq);
91 ndelay(host->clk_delay * tick_ns);
92 } else {
93 /* New users appeared while waiting for this work */
94 spin_unlock_irqrestore(&host->clk_lock, flags);
95 return;
96 }
97 mutex_lock(&host->clk_gate_mutex);
98 spin_lock_irqsave(&host->clk_lock, flags);
99 if (!host->clk_requests) {
100 spin_unlock_irqrestore(&host->clk_lock, flags);
101 /* This will set host->ios.clock to 0 */
102 mmc_gate_clock(host);
103 spin_lock_irqsave(&host->clk_lock, flags);
104 pr_debug("%s: gated MCI clock\n", mmc_hostname(host));
105 }
106 spin_unlock_irqrestore(&host->clk_lock, flags);
107 mutex_unlock(&host->clk_gate_mutex);
108}
109
110/*
111 * Internal work. Work to disable the clock at some later point.
112 */
113static void mmc_host_clk_gate_work(struct work_struct *work)
114{
115 struct mmc_host *host = container_of(work, struct mmc_host,
116 clk_gate_work);
117
118 mmc_host_clk_gate_delayed(host);
119}
120
121/**
122 * mmc_host_clk_hold - ungate hardware MCI clocks
123 * @host: host to ungate.
124 *
125 * Makes sure the host ios.clock is restored to a non-zero value
126 * past this call. Increase clock reference count and ungate clock
127 * if we're the first user.
128 */
129void mmc_host_clk_hold(struct mmc_host *host)
130{
131 unsigned long flags;
132
133 mutex_lock(&host->clk_gate_mutex);
134 spin_lock_irqsave(&host->clk_lock, flags);
135 if (host->clk_gated) {
136 spin_unlock_irqrestore(&host->clk_lock, flags);
137 mmc_ungate_clock(host);
138 spin_lock_irqsave(&host->clk_lock, flags);
139 pr_debug("%s: ungated MCI clock\n", mmc_hostname(host));
140 }
141 host->clk_requests++;
142 spin_unlock_irqrestore(&host->clk_lock, flags);
143 mutex_unlock(&host->clk_gate_mutex);
144}
145
146/**
147 * mmc_host_may_gate_card - check if this card may be gated
148 * @card: card to check.
149 */
150static bool mmc_host_may_gate_card(struct mmc_card *card)
151{
152 /* If there is no card we may gate it */
153 if (!card)
154 return true;
155 /*
156 * Don't gate SDIO cards! These need to be clocked at all times
157 * since they may be independent systems generating interrupts
158 * and other events. The clock requests counter from the core will
159 * go down to zero since the core does not need it, but we will not
160 * gate the clock, because there is somebody out there that may still
161 * be using it.
162 */
163 return !(card->quirks & MMC_QUIRK_BROKEN_CLK_GATING);
164}
165
166/**
167 * mmc_host_clk_release - gate off hardware MCI clocks
168 * @host: host to gate.
169 *
170 * Calls the host driver with ios.clock set to zero as often as possible
171 * in order to gate off hardware MCI clocks. Decrease clock reference
172 * count and schedule disabling of clock.
173 */
174void mmc_host_clk_release(struct mmc_host *host)
175{
176 unsigned long flags;
177
178 spin_lock_irqsave(&host->clk_lock, flags);
179 host->clk_requests--;
180 if (mmc_host_may_gate_card(host->card) &&
181 !host->clk_requests)
182 queue_work(system_nrt_wq, &host->clk_gate_work);
183 spin_unlock_irqrestore(&host->clk_lock, flags);
184}
185
186/**
187 * mmc_host_clk_rate - get current clock frequency setting
188 * @host: host to get the clock frequency for.
189 *
190 * Returns current clock frequency regardless of gating.
191 */
192unsigned int mmc_host_clk_rate(struct mmc_host *host)
193{
194 unsigned long freq;
195 unsigned long flags;
196
197 spin_lock_irqsave(&host->clk_lock, flags);
198 if (host->clk_gated)
199 freq = host->clk_old;
200 else
201 freq = host->ios.clock;
202 spin_unlock_irqrestore(&host->clk_lock, flags);
203 return freq;
204}
205
206/**
207 * mmc_host_clk_init - set up clock gating code
208 * @host: host with potential clock to control
209 */
210static inline void mmc_host_clk_init(struct mmc_host *host)
211{
212 host->clk_requests = 0;
213 /* Hold MCI clock for 8 cycles by default */
214 host->clk_delay = 8;
215 host->clk_gated = false;
216 INIT_WORK(&host->clk_gate_work, mmc_host_clk_gate_work);
217 spin_lock_init(&host->clk_lock);
218 mutex_init(&host->clk_gate_mutex);
219}
220
221/**
222 * mmc_host_clk_exit - shut down clock gating code
223 * @host: host with potential clock to control
224 */
225static inline void mmc_host_clk_exit(struct mmc_host *host)
226{
227 /*
228 * Wait for any outstanding gate and then make sure we're
229 * ungated before exiting.
230 */
231 if (cancel_work_sync(&host->clk_gate_work))
232 mmc_host_clk_gate_delayed(host);
233 if (host->clk_gated)
234 mmc_host_clk_hold(host);
235 /* There should be only one user now */
236 WARN_ON(host->clk_requests > 1);
237}
238
239#else
240
241static inline void mmc_host_clk_init(struct mmc_host *host)
242{
243}
244
245static inline void mmc_host_clk_exit(struct mmc_host *host)
246{
247}
248
249#endif
250
251/**
252 * mmc_alloc_host - initialise the per-host structure.
253 * @extra: sizeof private data structure
254 * @dev: pointer to host device model structure
255 *
256 * Initialise the per-host structure.
257 */
258struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
259{
260 int err;
261 struct mmc_host *host;
262
263 if (!idr_pre_get(&mmc_host_idr, GFP_KERNEL))
264 return NULL;
265
266 host = kzalloc(sizeof(struct mmc_host) + extra, GFP_KERNEL);
267 if (!host)
268 return NULL;
269
270 spin_lock(&mmc_host_lock);
271 err = idr_get_new(&mmc_host_idr, host, &host->index);
272 spin_unlock(&mmc_host_lock);
273 if (err)
274 goto free;
275
276 dev_set_name(&host->class_dev, "mmc%d", host->index);
277
278 host->parent = dev;
279 host->class_dev.parent = dev;
280 host->class_dev.class = &mmc_host_class;
281 device_initialize(&host->class_dev);
282
283 mmc_host_clk_init(host);
284
285 spin_lock_init(&host->lock);
286 init_waitqueue_head(&host->wq);
287 INIT_DELAYED_WORK(&host->detect, mmc_rescan);
288 INIT_DELAYED_WORK_DEFERRABLE(&host->disable, mmc_host_deeper_disable);
289#ifdef CONFIG_PM
290 host->pm_notify.notifier_call = mmc_pm_notify;
291#endif
292
293 /*
294 * By default, hosts do not support SGIO or large requests.
295 * They have to set these according to their abilities.
296 */
297 host->max_segs = 1;
298 host->max_seg_size = PAGE_CACHE_SIZE;
299
300 host->max_req_size = PAGE_CACHE_SIZE;
301 host->max_blk_size = 512;
302 host->max_blk_count = PAGE_CACHE_SIZE / 512;
303
304 return host;
305
306free:
307 kfree(host);
308 return NULL;
309}
310
311EXPORT_SYMBOL(mmc_alloc_host);
312
313/**
314 * mmc_add_host - initialise host hardware
315 * @host: mmc host
316 *
317 * Register the host with the driver model. The host must be
318 * prepared to start servicing requests before this function
319 * completes.
320 */
321int mmc_add_host(struct mmc_host *host)
322{
323 int err;
324
325 WARN_ON((host->caps & MMC_CAP_SDIO_IRQ) &&
326 !host->ops->enable_sdio_irq);
327
328 err = device_add(&host->class_dev);
329 if (err)
330 return err;
331
332 led_trigger_register_simple(dev_name(&host->class_dev), &host->led);
333
334#ifdef CONFIG_DEBUG_FS
335 mmc_add_host_debugfs(host);
336#endif
337
338 mmc_start_host(host);
339 register_pm_notifier(&host->pm_notify);
340
341 return 0;
342}
343
344EXPORT_SYMBOL(mmc_add_host);
345
346/**
347 * mmc_remove_host - remove host hardware
348 * @host: mmc host
349 *
350 * Unregister and remove all cards associated with this host,
351 * and power down the MMC bus. No new requests will be issued
352 * after this function has returned.
353 */
354void mmc_remove_host(struct mmc_host *host)
355{
356 unregister_pm_notifier(&host->pm_notify);
357 mmc_stop_host(host);
358
359#ifdef CONFIG_DEBUG_FS
360 mmc_remove_host_debugfs(host);
361#endif
362
363 device_del(&host->class_dev);
364
365 led_trigger_unregister_simple(host->led);
366
367 mmc_host_clk_exit(host);
368}
369
370EXPORT_SYMBOL(mmc_remove_host);
371
372/**
373 * mmc_free_host - free the host structure
374 * @host: mmc host
375 *
376 * Free the host once all references to it have been dropped.
377 */
378void mmc_free_host(struct mmc_host *host)
379{
380 spin_lock(&mmc_host_lock);
381 idr_remove(&mmc_host_idr, host->index);
382 spin_unlock(&mmc_host_lock);
383
384 put_device(&host->class_dev);
385}
386
387EXPORT_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 "host.h"
29#include "slot-gpio.h"
30#include "pwrseq.h"
31#include "sdio_ops.h"
32
33#define cls_dev_to_mmc_host(d) container_of(d, struct mmc_host, class_dev)
34
35static DEFINE_IDA(mmc_host_ida);
36
37static void mmc_host_classdev_release(struct device *dev)
38{
39 struct mmc_host *host = cls_dev_to_mmc_host(dev);
40 wakeup_source_unregister(host->ws);
41 ida_simple_remove(&mmc_host_ida, host->index);
42 kfree(host);
43}
44
45static struct class mmc_host_class = {
46 .name = "mmc_host",
47 .dev_release = mmc_host_classdev_release,
48};
49
50int mmc_register_host_class(void)
51{
52 return class_register(&mmc_host_class);
53}
54
55void mmc_unregister_host_class(void)
56{
57 class_unregister(&mmc_host_class);
58}
59
60void mmc_retune_enable(struct mmc_host *host)
61{
62 host->can_retune = 1;
63 if (host->retune_period)
64 mod_timer(&host->retune_timer,
65 jiffies + host->retune_period * HZ);
66}
67
68/*
69 * Pause re-tuning for a small set of operations. The pause begins after the
70 * next command and after first doing re-tuning.
71 */
72void mmc_retune_pause(struct mmc_host *host)
73{
74 if (!host->retune_paused) {
75 host->retune_paused = 1;
76 mmc_retune_needed(host);
77 mmc_retune_hold(host);
78 }
79}
80EXPORT_SYMBOL(mmc_retune_pause);
81
82void mmc_retune_unpause(struct mmc_host *host)
83{
84 if (host->retune_paused) {
85 host->retune_paused = 0;
86 mmc_retune_release(host);
87 }
88}
89EXPORT_SYMBOL(mmc_retune_unpause);
90
91void mmc_retune_disable(struct mmc_host *host)
92{
93 mmc_retune_unpause(host);
94 host->can_retune = 0;
95 del_timer_sync(&host->retune_timer);
96 host->retune_now = 0;
97 host->need_retune = 0;
98}
99
100void mmc_retune_timer_stop(struct mmc_host *host)
101{
102 del_timer_sync(&host->retune_timer);
103}
104EXPORT_SYMBOL(mmc_retune_timer_stop);
105
106void mmc_retune_hold(struct mmc_host *host)
107{
108 if (!host->hold_retune)
109 host->retune_now = 1;
110 host->hold_retune += 1;
111}
112
113void mmc_retune_release(struct mmc_host *host)
114{
115 if (host->hold_retune)
116 host->hold_retune -= 1;
117 else
118 WARN_ON(1);
119}
120EXPORT_SYMBOL(mmc_retune_release);
121
122int mmc_retune(struct mmc_host *host)
123{
124 bool return_to_hs400 = false;
125 int err;
126
127 if (host->retune_now)
128 host->retune_now = 0;
129 else
130 return 0;
131
132 if (!host->need_retune || host->doing_retune || !host->card)
133 return 0;
134
135 host->need_retune = 0;
136
137 host->doing_retune = 1;
138
139 if (host->ios.timing == MMC_TIMING_MMC_HS400) {
140 err = mmc_hs400_to_hs200(host->card);
141 if (err)
142 goto out;
143
144 return_to_hs400 = true;
145 }
146
147 err = mmc_execute_tuning(host->card);
148 if (err)
149 goto out;
150
151 if (return_to_hs400)
152 err = mmc_hs200_to_hs400(host->card);
153out:
154 host->doing_retune = 0;
155
156 return err;
157}
158
159static void mmc_retune_timer(struct timer_list *t)
160{
161 struct mmc_host *host = from_timer(host, t, retune_timer);
162
163 mmc_retune_needed(host);
164}
165
166/**
167 * mmc_of_parse() - parse host's device-tree node
168 * @host: host whose node should be parsed.
169 *
170 * To keep the rest of the MMC subsystem unaware of whether DT has been
171 * used to to instantiate and configure this host instance or not, we
172 * parse the properties and set respective generic mmc-host flags and
173 * parameters.
174 */
175int mmc_of_parse(struct mmc_host *host)
176{
177 struct device *dev = host->parent;
178 u32 bus_width, drv_type, cd_debounce_delay_ms;
179 int ret;
180
181 if (!dev || !dev_fwnode(dev))
182 return 0;
183
184 /* "bus-width" is translated to MMC_CAP_*_BIT_DATA flags */
185 if (device_property_read_u32(dev, "bus-width", &bus_width) < 0) {
186 dev_dbg(host->parent,
187 "\"bus-width\" property is missing, assuming 1 bit.\n");
188 bus_width = 1;
189 }
190
191 switch (bus_width) {
192 case 8:
193 host->caps |= MMC_CAP_8_BIT_DATA;
194 fallthrough; /* Hosts capable of 8-bit can also do 4 bits */
195 case 4:
196 host->caps |= MMC_CAP_4_BIT_DATA;
197 break;
198 case 1:
199 break;
200 default:
201 dev_err(host->parent,
202 "Invalid \"bus-width\" value %u!\n", bus_width);
203 return -EINVAL;
204 }
205
206 /* f_max is obtained from the optional "max-frequency" property */
207 device_property_read_u32(dev, "max-frequency", &host->f_max);
208
209 /*
210 * Configure CD and WP pins. They are both by default active low to
211 * match the SDHCI spec. If GPIOs are provided for CD and / or WP, the
212 * mmc-gpio helpers are used to attach, configure and use them. If
213 * polarity inversion is specified in DT, one of MMC_CAP2_CD_ACTIVE_HIGH
214 * and MMC_CAP2_RO_ACTIVE_HIGH capability-2 flags is set. If the
215 * "broken-cd" property is provided, the MMC_CAP_NEEDS_POLL capability
216 * is set. If the "non-removable" property is found, the
217 * MMC_CAP_NONREMOVABLE capability is set and no card-detection
218 * configuration is performed.
219 */
220
221 /* Parse Card Detection */
222
223 if (device_property_read_bool(dev, "non-removable")) {
224 host->caps |= MMC_CAP_NONREMOVABLE;
225 } else {
226 if (device_property_read_bool(dev, "cd-inverted"))
227 host->caps2 |= MMC_CAP2_CD_ACTIVE_HIGH;
228
229 if (device_property_read_u32(dev, "cd-debounce-delay-ms",
230 &cd_debounce_delay_ms))
231 cd_debounce_delay_ms = 200;
232
233 if (device_property_read_bool(dev, "broken-cd"))
234 host->caps |= MMC_CAP_NEEDS_POLL;
235
236 ret = mmc_gpiod_request_cd(host, "cd", 0, false,
237 cd_debounce_delay_ms * 1000);
238 if (!ret)
239 dev_info(host->parent, "Got CD GPIO\n");
240 else if (ret != -ENOENT && ret != -ENOSYS)
241 return ret;
242 }
243
244 /* Parse Write Protection */
245
246 if (device_property_read_bool(dev, "wp-inverted"))
247 host->caps2 |= MMC_CAP2_RO_ACTIVE_HIGH;
248
249 ret = mmc_gpiod_request_ro(host, "wp", 0, 0);
250 if (!ret)
251 dev_info(host->parent, "Got WP GPIO\n");
252 else if (ret != -ENOENT && ret != -ENOSYS)
253 return ret;
254
255 if (device_property_read_bool(dev, "disable-wp"))
256 host->caps2 |= MMC_CAP2_NO_WRITE_PROTECT;
257
258 if (device_property_read_bool(dev, "cap-sd-highspeed"))
259 host->caps |= MMC_CAP_SD_HIGHSPEED;
260 if (device_property_read_bool(dev, "cap-mmc-highspeed"))
261 host->caps |= MMC_CAP_MMC_HIGHSPEED;
262 if (device_property_read_bool(dev, "sd-uhs-sdr12"))
263 host->caps |= MMC_CAP_UHS_SDR12;
264 if (device_property_read_bool(dev, "sd-uhs-sdr25"))
265 host->caps |= MMC_CAP_UHS_SDR25;
266 if (device_property_read_bool(dev, "sd-uhs-sdr50"))
267 host->caps |= MMC_CAP_UHS_SDR50;
268 if (device_property_read_bool(dev, "sd-uhs-sdr104"))
269 host->caps |= MMC_CAP_UHS_SDR104;
270 if (device_property_read_bool(dev, "sd-uhs-ddr50"))
271 host->caps |= MMC_CAP_UHS_DDR50;
272 if (device_property_read_bool(dev, "cap-power-off-card"))
273 host->caps |= MMC_CAP_POWER_OFF_CARD;
274 if (device_property_read_bool(dev, "cap-mmc-hw-reset"))
275 host->caps |= MMC_CAP_HW_RESET;
276 if (device_property_read_bool(dev, "cap-sdio-irq"))
277 host->caps |= MMC_CAP_SDIO_IRQ;
278 if (device_property_read_bool(dev, "full-pwr-cycle"))
279 host->caps2 |= MMC_CAP2_FULL_PWR_CYCLE;
280 if (device_property_read_bool(dev, "full-pwr-cycle-in-suspend"))
281 host->caps2 |= MMC_CAP2_FULL_PWR_CYCLE_IN_SUSPEND;
282 if (device_property_read_bool(dev, "keep-power-in-suspend"))
283 host->pm_caps |= MMC_PM_KEEP_POWER;
284 if (device_property_read_bool(dev, "wakeup-source") ||
285 device_property_read_bool(dev, "enable-sdio-wakeup")) /* legacy */
286 host->pm_caps |= MMC_PM_WAKE_SDIO_IRQ;
287 if (device_property_read_bool(dev, "mmc-ddr-3_3v"))
288 host->caps |= MMC_CAP_3_3V_DDR;
289 if (device_property_read_bool(dev, "mmc-ddr-1_8v"))
290 host->caps |= MMC_CAP_1_8V_DDR;
291 if (device_property_read_bool(dev, "mmc-ddr-1_2v"))
292 host->caps |= MMC_CAP_1_2V_DDR;
293 if (device_property_read_bool(dev, "mmc-hs200-1_8v"))
294 host->caps2 |= MMC_CAP2_HS200_1_8V_SDR;
295 if (device_property_read_bool(dev, "mmc-hs200-1_2v"))
296 host->caps2 |= MMC_CAP2_HS200_1_2V_SDR;
297 if (device_property_read_bool(dev, "mmc-hs400-1_8v"))
298 host->caps2 |= MMC_CAP2_HS400_1_8V | MMC_CAP2_HS200_1_8V_SDR;
299 if (device_property_read_bool(dev, "mmc-hs400-1_2v"))
300 host->caps2 |= MMC_CAP2_HS400_1_2V | MMC_CAP2_HS200_1_2V_SDR;
301 if (device_property_read_bool(dev, "mmc-hs400-enhanced-strobe"))
302 host->caps2 |= MMC_CAP2_HS400_ES;
303 if (device_property_read_bool(dev, "no-sdio"))
304 host->caps2 |= MMC_CAP2_NO_SDIO;
305 if (device_property_read_bool(dev, "no-sd"))
306 host->caps2 |= MMC_CAP2_NO_SD;
307 if (device_property_read_bool(dev, "no-mmc"))
308 host->caps2 |= MMC_CAP2_NO_MMC;
309
310 /* Must be after "non-removable" check */
311 if (device_property_read_u32(dev, "fixed-emmc-driver-type", &drv_type) == 0) {
312 if (host->caps & MMC_CAP_NONREMOVABLE)
313 host->fixed_drv_type = drv_type;
314 else
315 dev_err(host->parent,
316 "can't use fixed driver type, media is removable\n");
317 }
318
319 host->dsr_req = !device_property_read_u32(dev, "dsr", &host->dsr);
320 if (host->dsr_req && (host->dsr & ~0xffff)) {
321 dev_err(host->parent,
322 "device tree specified broken value for DSR: 0x%x, ignoring\n",
323 host->dsr);
324 host->dsr_req = 0;
325 }
326
327 device_property_read_u32(dev, "post-power-on-delay-ms",
328 &host->ios.power_delay_ms);
329
330 return mmc_pwrseq_alloc(host);
331}
332
333EXPORT_SYMBOL(mmc_of_parse);
334
335/**
336 * mmc_of_parse_voltage - return mask of supported voltages
337 * @np: The device node need to be parsed.
338 * @mask: mask of voltages available for MMC/SD/SDIO
339 *
340 * Parse the "voltage-ranges" DT property, returning zero if it is not
341 * found, negative errno if the voltage-range specification is invalid,
342 * or one if the voltage-range is specified and successfully parsed.
343 */
344int mmc_of_parse_voltage(struct device_node *np, u32 *mask)
345{
346 const u32 *voltage_ranges;
347 int num_ranges, i;
348
349 voltage_ranges = of_get_property(np, "voltage-ranges", &num_ranges);
350 if (!voltage_ranges) {
351 pr_debug("%pOF: voltage-ranges unspecified\n", np);
352 return 0;
353 }
354 num_ranges = num_ranges / sizeof(*voltage_ranges) / 2;
355 if (!num_ranges) {
356 pr_err("%pOF: voltage-ranges empty\n", np);
357 return -EINVAL;
358 }
359
360 for (i = 0; i < num_ranges; i++) {
361 const int j = i * 2;
362 u32 ocr_mask;
363
364 ocr_mask = mmc_vddrange_to_ocrmask(
365 be32_to_cpu(voltage_ranges[j]),
366 be32_to_cpu(voltage_ranges[j + 1]));
367 if (!ocr_mask) {
368 pr_err("%pOF: voltage-range #%d is invalid\n",
369 np, i);
370 return -EINVAL;
371 }
372 *mask |= ocr_mask;
373 }
374
375 return 1;
376}
377EXPORT_SYMBOL(mmc_of_parse_voltage);
378
379/**
380 * mmc_alloc_host - initialise the per-host structure.
381 * @extra: sizeof private data structure
382 * @dev: pointer to host device model structure
383 *
384 * Initialise the per-host structure.
385 */
386struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
387{
388 int err;
389 struct mmc_host *host;
390
391 host = kzalloc(sizeof(struct mmc_host) + extra, GFP_KERNEL);
392 if (!host)
393 return NULL;
394
395 /* scanning will be enabled when we're ready */
396 host->rescan_disable = 1;
397
398 err = ida_simple_get(&mmc_host_ida, 0, 0, GFP_KERNEL);
399 if (err < 0) {
400 kfree(host);
401 return NULL;
402 }
403
404 host->index = err;
405
406 dev_set_name(&host->class_dev, "mmc%d", host->index);
407 host->ws = wakeup_source_register(NULL, dev_name(&host->class_dev));
408
409 host->parent = dev;
410 host->class_dev.parent = dev;
411 host->class_dev.class = &mmc_host_class;
412 device_initialize(&host->class_dev);
413 device_enable_async_suspend(&host->class_dev);
414
415 if (mmc_gpio_alloc(host)) {
416 put_device(&host->class_dev);
417 return NULL;
418 }
419
420 spin_lock_init(&host->lock);
421 init_waitqueue_head(&host->wq);
422 INIT_DELAYED_WORK(&host->detect, mmc_rescan);
423 INIT_DELAYED_WORK(&host->sdio_irq_work, sdio_irq_work);
424 timer_setup(&host->retune_timer, mmc_retune_timer, 0);
425
426 /*
427 * By default, hosts do not support SGIO or large requests.
428 * They have to set these according to their abilities.
429 */
430 host->max_segs = 1;
431 host->max_seg_size = PAGE_SIZE;
432
433 host->max_req_size = PAGE_SIZE;
434 host->max_blk_size = 512;
435 host->max_blk_count = PAGE_SIZE / 512;
436
437 host->fixed_drv_type = -EINVAL;
438 host->ios.power_delay_ms = 10;
439 host->ios.power_mode = MMC_POWER_UNDEFINED;
440
441 return host;
442}
443
444EXPORT_SYMBOL(mmc_alloc_host);
445
446/**
447 * mmc_add_host - initialise host hardware
448 * @host: mmc host
449 *
450 * Register the host with the driver model. The host must be
451 * prepared to start servicing requests before this function
452 * completes.
453 */
454int mmc_add_host(struct mmc_host *host)
455{
456 int err;
457
458 WARN_ON((host->caps & MMC_CAP_SDIO_IRQ) &&
459 !host->ops->enable_sdio_irq);
460
461 err = device_add(&host->class_dev);
462 if (err)
463 return err;
464
465 led_trigger_register_simple(dev_name(&host->class_dev), &host->led);
466
467#ifdef CONFIG_DEBUG_FS
468 mmc_add_host_debugfs(host);
469#endif
470
471 mmc_start_host(host);
472 mmc_register_pm_notifier(host);
473
474 return 0;
475}
476
477EXPORT_SYMBOL(mmc_add_host);
478
479/**
480 * mmc_remove_host - remove host hardware
481 * @host: mmc host
482 *
483 * Unregister and remove all cards associated with this host,
484 * and power down the MMC bus. No new requests will be issued
485 * after this function has returned.
486 */
487void mmc_remove_host(struct mmc_host *host)
488{
489 mmc_unregister_pm_notifier(host);
490 mmc_stop_host(host);
491
492#ifdef CONFIG_DEBUG_FS
493 mmc_remove_host_debugfs(host);
494#endif
495
496 device_del(&host->class_dev);
497
498 led_trigger_unregister_simple(host->led);
499}
500
501EXPORT_SYMBOL(mmc_remove_host);
502
503/**
504 * mmc_free_host - free the host structure
505 * @host: mmc host
506 *
507 * Free the host once all references to it have been dropped.
508 */
509void mmc_free_host(struct mmc_host *host)
510{
511 mmc_pwrseq_free(host);
512 put_device(&host->class_dev);
513}
514
515EXPORT_SYMBOL(mmc_free_host);