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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/*
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_IDA(mmc_host_ida);
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 ida_remove(&mmc_host_ida, 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
71/*
72 * Pause re-tuning for a small set of operations. The pause begins after the
73 * next command and after first doing re-tuning.
74 */
75void mmc_retune_pause(struct mmc_host *host)
76{
77 if (!host->retune_paused) {
78 host->retune_paused = 1;
79 mmc_retune_needed(host);
80 mmc_retune_hold(host);
81 }
82}
83EXPORT_SYMBOL(mmc_retune_pause);
84
85void mmc_retune_unpause(struct mmc_host *host)
86{
87 if (host->retune_paused) {
88 host->retune_paused = 0;
89 mmc_retune_release(host);
90 }
91}
92EXPORT_SYMBOL(mmc_retune_unpause);
93
94void mmc_retune_disable(struct mmc_host *host)
95{
96 mmc_retune_unpause(host);
97 host->can_retune = 0;
98 del_timer_sync(&host->retune_timer);
99 host->retune_now = 0;
100 host->need_retune = 0;
101}
102
103void mmc_retune_timer_stop(struct mmc_host *host)
104{
105 del_timer_sync(&host->retune_timer);
106}
107EXPORT_SYMBOL(mmc_retune_timer_stop);
108
109void mmc_retune_hold(struct mmc_host *host)
110{
111 if (!host->hold_retune)
112 host->retune_now = 1;
113 host->hold_retune += 1;
114}
115
116void mmc_retune_release(struct mmc_host *host)
117{
118 if (host->hold_retune)
119 host->hold_retune -= 1;
120 else
121 WARN_ON(1);
122}
123
124int mmc_retune(struct mmc_host *host)
125{
126 bool return_to_hs400 = false;
127 int err;
128
129 if (host->retune_now)
130 host->retune_now = 0;
131 else
132 return 0;
133
134 if (!host->need_retune || host->doing_retune || !host->card)
135 return 0;
136
137 host->need_retune = 0;
138
139 host->doing_retune = 1;
140
141 if (host->ios.timing == MMC_TIMING_MMC_HS400) {
142 err = mmc_hs400_to_hs200(host->card);
143 if (err)
144 goto out;
145
146 return_to_hs400 = true;
147
148 if (host->ops->prepare_hs400_tuning)
149 host->ops->prepare_hs400_tuning(host, &host->ios);
150 }
151
152 err = mmc_execute_tuning(host->card);
153 if (err)
154 goto out;
155
156 if (return_to_hs400)
157 err = mmc_hs200_to_hs400(host->card);
158out:
159 host->doing_retune = 0;
160
161 return err;
162}
163
164static void mmc_retune_timer(unsigned long data)
165{
166 struct mmc_host *host = (struct mmc_host *)data;
167
168 mmc_retune_needed(host);
169}
170
171/**
172 * mmc_of_parse() - parse host's device-tree node
173 * @host: host whose node should be parsed.
174 *
175 * To keep the rest of the MMC subsystem unaware of whether DT has been
176 * used to to instantiate and configure this host instance or not, we
177 * parse the properties and set respective generic mmc-host flags and
178 * parameters.
179 */
180int mmc_of_parse(struct mmc_host *host)
181{
182 struct device_node *np;
183 u32 bus_width;
184 int ret;
185 bool cd_cap_invert, cd_gpio_invert = false;
186 bool ro_cap_invert, ro_gpio_invert = false;
187
188 if (!host->parent || !host->parent->of_node)
189 return 0;
190
191 np = host->parent->of_node;
192
193 /* "bus-width" is translated to MMC_CAP_*_BIT_DATA flags */
194 if (of_property_read_u32(np, "bus-width", &bus_width) < 0) {
195 dev_dbg(host->parent,
196 "\"bus-width\" property is missing, assuming 1 bit.\n");
197 bus_width = 1;
198 }
199
200 switch (bus_width) {
201 case 8:
202 host->caps |= MMC_CAP_8_BIT_DATA;
203 /* Hosts capable of 8-bit transfers can also do 4 bits */
204 case 4:
205 host->caps |= MMC_CAP_4_BIT_DATA;
206 break;
207 case 1:
208 break;
209 default:
210 dev_err(host->parent,
211 "Invalid \"bus-width\" value %u!\n", bus_width);
212 return -EINVAL;
213 }
214
215 /* f_max is obtained from the optional "max-frequency" property */
216 of_property_read_u32(np, "max-frequency", &host->f_max);
217
218 /*
219 * Configure CD and WP pins. They are both by default active low to
220 * match the SDHCI spec. If GPIOs are provided for CD and / or WP, the
221 * mmc-gpio helpers are used to attach, configure and use them. If
222 * polarity inversion is specified in DT, one of MMC_CAP2_CD_ACTIVE_HIGH
223 * and MMC_CAP2_RO_ACTIVE_HIGH capability-2 flags is set. If the
224 * "broken-cd" property is provided, the MMC_CAP_NEEDS_POLL capability
225 * is set. If the "non-removable" property is found, the
226 * MMC_CAP_NONREMOVABLE capability is set and no card-detection
227 * configuration is performed.
228 */
229
230 /* Parse Card Detection */
231 if (of_property_read_bool(np, "non-removable")) {
232 host->caps |= MMC_CAP_NONREMOVABLE;
233 } else {
234 cd_cap_invert = of_property_read_bool(np, "cd-inverted");
235
236 if (of_property_read_bool(np, "broken-cd"))
237 host->caps |= MMC_CAP_NEEDS_POLL;
238
239 ret = mmc_gpiod_request_cd(host, "cd", 0, true,
240 0, &cd_gpio_invert);
241 if (!ret)
242 dev_info(host->parent, "Got CD GPIO\n");
243 else if (ret != -ENOENT && ret != -ENOSYS)
244 return ret;
245
246 /*
247 * There are two ways to flag that the CD line is inverted:
248 * through the cd-inverted flag and by the GPIO line itself
249 * being inverted from the GPIO subsystem. This is a leftover
250 * from the times when the GPIO subsystem did not make it
251 * possible to flag a line as inverted.
252 *
253 * If the capability on the host AND the GPIO line are
254 * both inverted, the end result is that the CD line is
255 * not inverted.
256 */
257 if (cd_cap_invert ^ cd_gpio_invert)
258 host->caps2 |= MMC_CAP2_CD_ACTIVE_HIGH;
259 }
260
261 /* Parse Write Protection */
262 ro_cap_invert = of_property_read_bool(np, "wp-inverted");
263
264 ret = mmc_gpiod_request_ro(host, "wp", 0, false, 0, &ro_gpio_invert);
265 if (!ret)
266 dev_info(host->parent, "Got WP GPIO\n");
267 else if (ret != -ENOENT && ret != -ENOSYS)
268 return ret;
269
270 if (of_property_read_bool(np, "disable-wp"))
271 host->caps2 |= MMC_CAP2_NO_WRITE_PROTECT;
272
273 /* See the comment on CD inversion above */
274 if (ro_cap_invert ^ ro_gpio_invert)
275 host->caps2 |= MMC_CAP2_RO_ACTIVE_HIGH;
276
277 if (of_property_read_bool(np, "cap-sd-highspeed"))
278 host->caps |= MMC_CAP_SD_HIGHSPEED;
279 if (of_property_read_bool(np, "cap-mmc-highspeed"))
280 host->caps |= MMC_CAP_MMC_HIGHSPEED;
281 if (of_property_read_bool(np, "sd-uhs-sdr12"))
282 host->caps |= MMC_CAP_UHS_SDR12;
283 if (of_property_read_bool(np, "sd-uhs-sdr25"))
284 host->caps |= MMC_CAP_UHS_SDR25;
285 if (of_property_read_bool(np, "sd-uhs-sdr50"))
286 host->caps |= MMC_CAP_UHS_SDR50;
287 if (of_property_read_bool(np, "sd-uhs-sdr104"))
288 host->caps |= MMC_CAP_UHS_SDR104;
289 if (of_property_read_bool(np, "sd-uhs-ddr50"))
290 host->caps |= MMC_CAP_UHS_DDR50;
291 if (of_property_read_bool(np, "cap-power-off-card"))
292 host->caps |= MMC_CAP_POWER_OFF_CARD;
293 if (of_property_read_bool(np, "cap-mmc-hw-reset"))
294 host->caps |= MMC_CAP_HW_RESET;
295 if (of_property_read_bool(np, "cap-sdio-irq"))
296 host->caps |= MMC_CAP_SDIO_IRQ;
297 if (of_property_read_bool(np, "full-pwr-cycle"))
298 host->caps2 |= MMC_CAP2_FULL_PWR_CYCLE;
299 if (of_property_read_bool(np, "keep-power-in-suspend"))
300 host->pm_caps |= MMC_PM_KEEP_POWER;
301 if (of_property_read_bool(np, "wakeup-source") ||
302 of_property_read_bool(np, "enable-sdio-wakeup")) /* legacy */
303 host->pm_caps |= MMC_PM_WAKE_SDIO_IRQ;
304 if (of_property_read_bool(np, "mmc-ddr-1_8v"))
305 host->caps |= MMC_CAP_1_8V_DDR;
306 if (of_property_read_bool(np, "mmc-ddr-1_2v"))
307 host->caps |= MMC_CAP_1_2V_DDR;
308 if (of_property_read_bool(np, "mmc-hs200-1_8v"))
309 host->caps2 |= MMC_CAP2_HS200_1_8V_SDR;
310 if (of_property_read_bool(np, "mmc-hs200-1_2v"))
311 host->caps2 |= MMC_CAP2_HS200_1_2V_SDR;
312 if (of_property_read_bool(np, "mmc-hs400-1_8v"))
313 host->caps2 |= MMC_CAP2_HS400_1_8V | MMC_CAP2_HS200_1_8V_SDR;
314 if (of_property_read_bool(np, "mmc-hs400-1_2v"))
315 host->caps2 |= MMC_CAP2_HS400_1_2V | MMC_CAP2_HS200_1_2V_SDR;
316 if (of_property_read_bool(np, "mmc-hs400-enhanced-strobe"))
317 host->caps2 |= MMC_CAP2_HS400_ES;
318 if (of_property_read_bool(np, "no-sdio"))
319 host->caps2 |= MMC_CAP2_NO_SDIO;
320 if (of_property_read_bool(np, "no-sd"))
321 host->caps2 |= MMC_CAP2_NO_SD;
322 if (of_property_read_bool(np, "no-mmc"))
323 host->caps2 |= MMC_CAP2_NO_MMC;
324
325 host->dsr_req = !of_property_read_u32(np, "dsr", &host->dsr);
326 if (host->dsr_req && (host->dsr & ~0xffff)) {
327 dev_err(host->parent,
328 "device tree specified broken value for DSR: 0x%x, ignoring\n",
329 host->dsr);
330 host->dsr_req = 0;
331 }
332
333 return mmc_pwrseq_alloc(host);
334}
335
336EXPORT_SYMBOL(mmc_of_parse);
337
338/**
339 * mmc_alloc_host - initialise the per-host structure.
340 * @extra: sizeof private data structure
341 * @dev: pointer to host device model structure
342 *
343 * Initialise the per-host structure.
344 */
345struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
346{
347 int err;
348 struct mmc_host *host;
349
350 host = kzalloc(sizeof(struct mmc_host) + extra, GFP_KERNEL);
351 if (!host)
352 return NULL;
353
354 /* scanning will be enabled when we're ready */
355 host->rescan_disable = 1;
356
357again:
358 if (!ida_pre_get(&mmc_host_ida, GFP_KERNEL)) {
359 kfree(host);
360 return NULL;
361 }
362
363 spin_lock(&mmc_host_lock);
364 err = ida_get_new(&mmc_host_ida, &host->index);
365 spin_unlock(&mmc_host_lock);
366
367 if (err == -EAGAIN) {
368 goto again;
369 } else if (err) {
370 kfree(host);
371 return NULL;
372 }
373
374 dev_set_name(&host->class_dev, "mmc%d", host->index);
375
376 host->parent = dev;
377 host->class_dev.parent = dev;
378 host->class_dev.class = &mmc_host_class;
379 device_initialize(&host->class_dev);
380 device_enable_async_suspend(&host->class_dev);
381
382 if (mmc_gpio_alloc(host)) {
383 put_device(&host->class_dev);
384 return NULL;
385 }
386
387 spin_lock_init(&host->lock);
388 init_waitqueue_head(&host->wq);
389 INIT_DELAYED_WORK(&host->detect, mmc_rescan);
390 setup_timer(&host->retune_timer, mmc_retune_timer, (unsigned long)host);
391
392 /*
393 * By default, hosts do not support SGIO or large requests.
394 * They have to set these according to their abilities.
395 */
396 host->max_segs = 1;
397 host->max_seg_size = PAGE_SIZE;
398
399 host->max_req_size = PAGE_SIZE;
400 host->max_blk_size = 512;
401 host->max_blk_count = PAGE_SIZE / 512;
402
403 return host;
404}
405
406EXPORT_SYMBOL(mmc_alloc_host);
407
408/**
409 * mmc_add_host - initialise host hardware
410 * @host: mmc host
411 *
412 * Register the host with the driver model. The host must be
413 * prepared to start servicing requests before this function
414 * completes.
415 */
416int mmc_add_host(struct mmc_host *host)
417{
418 int err;
419
420 WARN_ON((host->caps & MMC_CAP_SDIO_IRQ) &&
421 !host->ops->enable_sdio_irq);
422
423 err = device_add(&host->class_dev);
424 if (err)
425 return err;
426
427 led_trigger_register_simple(dev_name(&host->class_dev), &host->led);
428
429#ifdef CONFIG_DEBUG_FS
430 mmc_add_host_debugfs(host);
431#endif
432
433 mmc_start_host(host);
434 mmc_register_pm_notifier(host);
435
436 return 0;
437}
438
439EXPORT_SYMBOL(mmc_add_host);
440
441/**
442 * mmc_remove_host - remove host hardware
443 * @host: mmc host
444 *
445 * Unregister and remove all cards associated with this host,
446 * and power down the MMC bus. No new requests will be issued
447 * after this function has returned.
448 */
449void mmc_remove_host(struct mmc_host *host)
450{
451 mmc_unregister_pm_notifier(host);
452 mmc_stop_host(host);
453
454#ifdef CONFIG_DEBUG_FS
455 mmc_remove_host_debugfs(host);
456#endif
457
458 device_del(&host->class_dev);
459
460 led_trigger_unregister_simple(host->led);
461}
462
463EXPORT_SYMBOL(mmc_remove_host);
464
465/**
466 * mmc_free_host - free the host structure
467 * @host: mmc host
468 *
469 * Free the host once all references to it have been dropped.
470 */
471void mmc_free_host(struct mmc_host *host)
472{
473 mmc_pwrseq_free(host);
474 put_device(&host->class_dev);
475}
476
477EXPORT_SYMBOL(mmc_free_host);