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1/*
2 * linux/include/linux/mmc/host.h
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 *
8 * Host driver specific definitions.
9 */
10#ifndef LINUX_MMC_HOST_H
11#define LINUX_MMC_HOST_H
12
13#include <linux/leds.h>
14#include <linux/sched.h>
15#include <linux/device.h>
16#include <linux/fault-inject.h>
17
18#include <linux/mmc/core.h>
19#include <linux/mmc/pm.h>
20
21struct mmc_ios {
22 unsigned int clock; /* clock rate */
23 unsigned short vdd;
24
25/* vdd stores the bit number of the selected voltage range from below. */
26
27 unsigned char bus_mode; /* command output mode */
28
29#define MMC_BUSMODE_OPENDRAIN 1
30#define MMC_BUSMODE_PUSHPULL 2
31
32 unsigned char chip_select; /* SPI chip select */
33
34#define MMC_CS_DONTCARE 0
35#define MMC_CS_HIGH 1
36#define MMC_CS_LOW 2
37
38 unsigned char power_mode; /* power supply mode */
39
40#define MMC_POWER_OFF 0
41#define MMC_POWER_UP 1
42#define MMC_POWER_ON 2
43
44 unsigned char bus_width; /* data bus width */
45
46#define MMC_BUS_WIDTH_1 0
47#define MMC_BUS_WIDTH_4 2
48#define MMC_BUS_WIDTH_8 3
49
50 unsigned char timing; /* timing specification used */
51
52#define MMC_TIMING_LEGACY 0
53#define MMC_TIMING_MMC_HS 1
54#define MMC_TIMING_SD_HS 2
55#define MMC_TIMING_UHS_SDR12 MMC_TIMING_LEGACY
56#define MMC_TIMING_UHS_SDR25 MMC_TIMING_SD_HS
57#define MMC_TIMING_UHS_SDR50 3
58#define MMC_TIMING_UHS_SDR104 4
59#define MMC_TIMING_UHS_DDR50 5
60#define MMC_TIMING_MMC_HS200 6
61
62#define MMC_SDR_MODE 0
63#define MMC_1_2V_DDR_MODE 1
64#define MMC_1_8V_DDR_MODE 2
65#define MMC_1_2V_SDR_MODE 3
66#define MMC_1_8V_SDR_MODE 4
67
68 unsigned char signal_voltage; /* signalling voltage (1.8V or 3.3V) */
69
70#define MMC_SIGNAL_VOLTAGE_330 0
71#define MMC_SIGNAL_VOLTAGE_180 1
72#define MMC_SIGNAL_VOLTAGE_120 2
73
74 unsigned char drv_type; /* driver type (A, B, C, D) */
75
76#define MMC_SET_DRIVER_TYPE_B 0
77#define MMC_SET_DRIVER_TYPE_A 1
78#define MMC_SET_DRIVER_TYPE_C 2
79#define MMC_SET_DRIVER_TYPE_D 3
80};
81
82struct mmc_host_ops {
83 /*
84 * 'enable' is called when the host is claimed and 'disable' is called
85 * when the host is released. 'enable' and 'disable' are deprecated.
86 */
87 int (*enable)(struct mmc_host *host);
88 int (*disable)(struct mmc_host *host);
89 /*
90 * It is optional for the host to implement pre_req and post_req in
91 * order to support double buffering of requests (prepare one
92 * request while another request is active).
93 * pre_req() must always be followed by a post_req().
94 * To undo a call made to pre_req(), call post_req() with
95 * a nonzero err condition.
96 */
97 void (*post_req)(struct mmc_host *host, struct mmc_request *req,
98 int err);
99 void (*pre_req)(struct mmc_host *host, struct mmc_request *req,
100 bool is_first_req);
101 void (*request)(struct mmc_host *host, struct mmc_request *req);
102 /*
103 * Avoid calling these three functions too often or in a "fast path",
104 * since underlaying controller might implement them in an expensive
105 * and/or slow way.
106 *
107 * Also note that these functions might sleep, so don't call them
108 * in the atomic contexts!
109 *
110 * Return values for the get_ro callback should be:
111 * 0 for a read/write card
112 * 1 for a read-only card
113 * -ENOSYS when not supported (equal to NULL callback)
114 * or a negative errno value when something bad happened
115 *
116 * Return values for the get_cd callback should be:
117 * 0 for a absent card
118 * 1 for a present card
119 * -ENOSYS when not supported (equal to NULL callback)
120 * or a negative errno value when something bad happened
121 */
122 void (*set_ios)(struct mmc_host *host, struct mmc_ios *ios);
123 int (*get_ro)(struct mmc_host *host);
124 int (*get_cd)(struct mmc_host *host);
125
126 void (*enable_sdio_irq)(struct mmc_host *host, int enable);
127
128 /* optional callback for HC quirks */
129 void (*init_card)(struct mmc_host *host, struct mmc_card *card);
130
131 int (*start_signal_voltage_switch)(struct mmc_host *host, struct mmc_ios *ios);
132
133 /* The tuning command opcode value is different for SD and eMMC cards */
134 int (*execute_tuning)(struct mmc_host *host, u32 opcode);
135 void (*enable_preset_value)(struct mmc_host *host, bool enable);
136 int (*select_drive_strength)(unsigned int max_dtr, int host_drv, int card_drv);
137 void (*hw_reset)(struct mmc_host *host);
138};
139
140struct mmc_card;
141struct device;
142
143struct mmc_async_req {
144 /* active mmc request */
145 struct mmc_request *mrq;
146 /*
147 * Check error status of completed mmc request.
148 * Returns 0 if success otherwise non zero.
149 */
150 int (*err_check) (struct mmc_card *, struct mmc_async_req *);
151};
152
153struct mmc_hotplug {
154 unsigned int irq;
155 void *handler_priv;
156};
157
158struct mmc_host {
159 struct device *parent;
160 struct device class_dev;
161 int index;
162 const struct mmc_host_ops *ops;
163 unsigned int f_min;
164 unsigned int f_max;
165 unsigned int f_init;
166 u32 ocr_avail;
167 u32 ocr_avail_sdio; /* SDIO-specific OCR */
168 u32 ocr_avail_sd; /* SD-specific OCR */
169 u32 ocr_avail_mmc; /* MMC-specific OCR */
170 struct notifier_block pm_notify;
171
172#define MMC_VDD_165_195 0x00000080 /* VDD voltage 1.65 - 1.95 */
173#define MMC_VDD_20_21 0x00000100 /* VDD voltage 2.0 ~ 2.1 */
174#define MMC_VDD_21_22 0x00000200 /* VDD voltage 2.1 ~ 2.2 */
175#define MMC_VDD_22_23 0x00000400 /* VDD voltage 2.2 ~ 2.3 */
176#define MMC_VDD_23_24 0x00000800 /* VDD voltage 2.3 ~ 2.4 */
177#define MMC_VDD_24_25 0x00001000 /* VDD voltage 2.4 ~ 2.5 */
178#define MMC_VDD_25_26 0x00002000 /* VDD voltage 2.5 ~ 2.6 */
179#define MMC_VDD_26_27 0x00004000 /* VDD voltage 2.6 ~ 2.7 */
180#define MMC_VDD_27_28 0x00008000 /* VDD voltage 2.7 ~ 2.8 */
181#define MMC_VDD_28_29 0x00010000 /* VDD voltage 2.8 ~ 2.9 */
182#define MMC_VDD_29_30 0x00020000 /* VDD voltage 2.9 ~ 3.0 */
183#define MMC_VDD_30_31 0x00040000 /* VDD voltage 3.0 ~ 3.1 */
184#define MMC_VDD_31_32 0x00080000 /* VDD voltage 3.1 ~ 3.2 */
185#define MMC_VDD_32_33 0x00100000 /* VDD voltage 3.2 ~ 3.3 */
186#define MMC_VDD_33_34 0x00200000 /* VDD voltage 3.3 ~ 3.4 */
187#define MMC_VDD_34_35 0x00400000 /* VDD voltage 3.4 ~ 3.5 */
188#define MMC_VDD_35_36 0x00800000 /* VDD voltage 3.5 ~ 3.6 */
189
190 unsigned long caps; /* Host capabilities */
191
192#define MMC_CAP_4_BIT_DATA (1 << 0) /* Can the host do 4 bit transfers */
193#define MMC_CAP_MMC_HIGHSPEED (1 << 1) /* Can do MMC high-speed timing */
194#define MMC_CAP_SD_HIGHSPEED (1 << 2) /* Can do SD high-speed timing */
195#define MMC_CAP_SDIO_IRQ (1 << 3) /* Can signal pending SDIO IRQs */
196#define MMC_CAP_SPI (1 << 4) /* Talks only SPI protocols */
197#define MMC_CAP_NEEDS_POLL (1 << 5) /* Needs polling for card-detection */
198#define MMC_CAP_8_BIT_DATA (1 << 6) /* Can the host do 8 bit transfers */
199
200#define MMC_CAP_NONREMOVABLE (1 << 8) /* Nonremovable e.g. eMMC */
201#define MMC_CAP_WAIT_WHILE_BUSY (1 << 9) /* Waits while card is busy */
202#define MMC_CAP_ERASE (1 << 10) /* Allow erase/trim commands */
203#define MMC_CAP_1_8V_DDR (1 << 11) /* can support */
204 /* DDR mode at 1.8V */
205#define MMC_CAP_1_2V_DDR (1 << 12) /* can support */
206 /* DDR mode at 1.2V */
207#define MMC_CAP_POWER_OFF_CARD (1 << 13) /* Can power off after boot */
208#define MMC_CAP_BUS_WIDTH_TEST (1 << 14) /* CMD14/CMD19 bus width ok */
209#define MMC_CAP_UHS_SDR12 (1 << 15) /* Host supports UHS SDR12 mode */
210#define MMC_CAP_UHS_SDR25 (1 << 16) /* Host supports UHS SDR25 mode */
211#define MMC_CAP_UHS_SDR50 (1 << 17) /* Host supports UHS SDR50 mode */
212#define MMC_CAP_UHS_SDR104 (1 << 18) /* Host supports UHS SDR104 mode */
213#define MMC_CAP_UHS_DDR50 (1 << 19) /* Host supports UHS DDR50 mode */
214#define MMC_CAP_SET_XPC_330 (1 << 20) /* Host supports >150mA current at 3.3V */
215#define MMC_CAP_SET_XPC_300 (1 << 21) /* Host supports >150mA current at 3.0V */
216#define MMC_CAP_SET_XPC_180 (1 << 22) /* Host supports >150mA current at 1.8V */
217#define MMC_CAP_DRIVER_TYPE_A (1 << 23) /* Host supports Driver Type A */
218#define MMC_CAP_DRIVER_TYPE_C (1 << 24) /* Host supports Driver Type C */
219#define MMC_CAP_DRIVER_TYPE_D (1 << 25) /* Host supports Driver Type D */
220#define MMC_CAP_MAX_CURRENT_200 (1 << 26) /* Host max current limit is 200mA */
221#define MMC_CAP_MAX_CURRENT_400 (1 << 27) /* Host max current limit is 400mA */
222#define MMC_CAP_MAX_CURRENT_600 (1 << 28) /* Host max current limit is 600mA */
223#define MMC_CAP_MAX_CURRENT_800 (1 << 29) /* Host max current limit is 800mA */
224#define MMC_CAP_CMD23 (1 << 30) /* CMD23 supported. */
225#define MMC_CAP_HW_RESET (1 << 31) /* Hardware reset */
226
227 unsigned int caps2; /* More host capabilities */
228
229#define MMC_CAP2_BOOTPART_NOACC (1 << 0) /* Boot partition no access */
230#define MMC_CAP2_CACHE_CTRL (1 << 1) /* Allow cache control */
231#define MMC_CAP2_POWEROFF_NOTIFY (1 << 2) /* Notify poweroff supported */
232#define MMC_CAP2_NO_MULTI_READ (1 << 3) /* Multiblock reads don't work */
233#define MMC_CAP2_NO_SLEEP_CMD (1 << 4) /* Don't allow sleep command */
234#define MMC_CAP2_HS200_1_8V_SDR (1 << 5) /* can support */
235#define MMC_CAP2_HS200_1_2V_SDR (1 << 6) /* can support */
236#define MMC_CAP2_HS200 (MMC_CAP2_HS200_1_8V_SDR | \
237 MMC_CAP2_HS200_1_2V_SDR)
238#define MMC_CAP2_BROKEN_VOLTAGE (1 << 7) /* Use the broken voltage */
239#define MMC_CAP2_DETECT_ON_ERR (1 << 8) /* On I/O err check card removal */
240#define MMC_CAP2_HC_ERASE_SZ (1 << 9) /* High-capacity erase size */
241
242 mmc_pm_flag_t pm_caps; /* supported pm features */
243 unsigned int power_notify_type;
244#define MMC_HOST_PW_NOTIFY_NONE 0
245#define MMC_HOST_PW_NOTIFY_SHORT 1
246#define MMC_HOST_PW_NOTIFY_LONG 2
247
248#ifdef CONFIG_MMC_CLKGATE
249 int clk_requests; /* internal reference counter */
250 unsigned int clk_delay; /* number of MCI clk hold cycles */
251 bool clk_gated; /* clock gated */
252 struct delayed_work clk_gate_work; /* delayed clock gate */
253 unsigned int clk_old; /* old clock value cache */
254 spinlock_t clk_lock; /* lock for clk fields */
255 struct mutex clk_gate_mutex; /* mutex for clock gating */
256 struct device_attribute clkgate_delay_attr;
257 unsigned long clkgate_delay;
258#endif
259
260 /* host specific block data */
261 unsigned int max_seg_size; /* see blk_queue_max_segment_size */
262 unsigned short max_segs; /* see blk_queue_max_segments */
263 unsigned short unused;
264 unsigned int max_req_size; /* maximum number of bytes in one req */
265 unsigned int max_blk_size; /* maximum size of one mmc block */
266 unsigned int max_blk_count; /* maximum number of blocks in one req */
267 unsigned int max_discard_to; /* max. discard timeout in ms */
268
269 /* private data */
270 spinlock_t lock; /* lock for claim and bus ops */
271
272 struct mmc_ios ios; /* current io bus settings */
273 u32 ocr; /* the current OCR setting */
274
275 /* group bitfields together to minimize padding */
276 unsigned int use_spi_crc:1;
277 unsigned int claimed:1; /* host exclusively claimed */
278 unsigned int bus_dead:1; /* bus has been released */
279#ifdef CONFIG_MMC_DEBUG
280 unsigned int removed:1; /* host is being removed */
281#endif
282
283 int rescan_disable; /* disable card detection */
284
285 struct mmc_card *card; /* device attached to this host */
286
287 wait_queue_head_t wq;
288 struct task_struct *claimer; /* task that has host claimed */
289 int claim_cnt; /* "claim" nesting count */
290
291 struct delayed_work detect;
292 int detect_change; /* card detect flag */
293 struct mmc_hotplug hotplug;
294
295 const struct mmc_bus_ops *bus_ops; /* current bus driver */
296 unsigned int bus_refs; /* reference counter */
297
298 unsigned int sdio_irqs;
299 struct task_struct *sdio_irq_thread;
300 atomic_t sdio_irq_thread_abort;
301
302 mmc_pm_flag_t pm_flags; /* requested pm features */
303
304#ifdef CONFIG_LEDS_TRIGGERS
305 struct led_trigger *led; /* activity led */
306#endif
307
308#ifdef CONFIG_REGULATOR
309 bool regulator_enabled; /* regulator state */
310#endif
311
312 struct dentry *debugfs_root;
313
314 struct mmc_async_req *areq; /* active async req */
315
316#ifdef CONFIG_FAIL_MMC_REQUEST
317 struct fault_attr fail_mmc_request;
318#endif
319
320 unsigned int actual_clock; /* Actual HC clock rate */
321
322 unsigned long private[0] ____cacheline_aligned;
323};
324
325extern struct mmc_host *mmc_alloc_host(int extra, struct device *);
326extern int mmc_add_host(struct mmc_host *);
327extern void mmc_remove_host(struct mmc_host *);
328extern void mmc_free_host(struct mmc_host *);
329
330static inline void *mmc_priv(struct mmc_host *host)
331{
332 return (void *)host->private;
333}
334
335#define mmc_host_is_spi(host) ((host)->caps & MMC_CAP_SPI)
336
337#define mmc_dev(x) ((x)->parent)
338#define mmc_classdev(x) (&(x)->class_dev)
339#define mmc_hostname(x) (dev_name(&(x)->class_dev))
340
341extern int mmc_suspend_host(struct mmc_host *);
342extern int mmc_resume_host(struct mmc_host *);
343
344extern int mmc_power_save_host(struct mmc_host *host);
345extern int mmc_power_restore_host(struct mmc_host *host);
346
347extern void mmc_detect_change(struct mmc_host *, unsigned long delay);
348extern void mmc_request_done(struct mmc_host *, struct mmc_request *);
349
350extern int mmc_cache_ctrl(struct mmc_host *, u8);
351
352static inline void mmc_signal_sdio_irq(struct mmc_host *host)
353{
354 host->ops->enable_sdio_irq(host, 0);
355 wake_up_process(host->sdio_irq_thread);
356}
357
358struct regulator;
359
360#ifdef CONFIG_REGULATOR
361int mmc_regulator_get_ocrmask(struct regulator *supply);
362int mmc_regulator_set_ocr(struct mmc_host *mmc,
363 struct regulator *supply,
364 unsigned short vdd_bit);
365#else
366static inline int mmc_regulator_get_ocrmask(struct regulator *supply)
367{
368 return 0;
369}
370
371static inline int mmc_regulator_set_ocr(struct mmc_host *mmc,
372 struct regulator *supply,
373 unsigned short vdd_bit)
374{
375 return 0;
376}
377#endif
378
379int mmc_card_awake(struct mmc_host *host);
380int mmc_card_sleep(struct mmc_host *host);
381int mmc_card_can_sleep(struct mmc_host *host);
382
383int mmc_pm_notify(struct notifier_block *notify_block, unsigned long, void *);
384
385/* Module parameter */
386extern bool mmc_assume_removable;
387
388static inline int mmc_card_is_removable(struct mmc_host *host)
389{
390 return !(host->caps & MMC_CAP_NONREMOVABLE) && mmc_assume_removable;
391}
392
393static inline int mmc_card_keep_power(struct mmc_host *host)
394{
395 return host->pm_flags & MMC_PM_KEEP_POWER;
396}
397
398static inline int mmc_card_wake_sdio_irq(struct mmc_host *host)
399{
400 return host->pm_flags & MMC_PM_WAKE_SDIO_IRQ;
401}
402
403static inline int mmc_host_cmd23(struct mmc_host *host)
404{
405 return host->caps & MMC_CAP_CMD23;
406}
407
408static inline int mmc_boot_partition_access(struct mmc_host *host)
409{
410 return !(host->caps2 & MMC_CAP2_BOOTPART_NOACC);
411}
412
413#ifdef CONFIG_MMC_CLKGATE
414void mmc_host_clk_hold(struct mmc_host *host);
415void mmc_host_clk_release(struct mmc_host *host);
416unsigned int mmc_host_clk_rate(struct mmc_host *host);
417
418#else
419static inline void mmc_host_clk_hold(struct mmc_host *host)
420{
421}
422
423static inline void mmc_host_clk_release(struct mmc_host *host)
424{
425}
426
427static inline unsigned int mmc_host_clk_rate(struct mmc_host *host)
428{
429 return host->ios.clock;
430}
431#endif
432#endif /* LINUX_MMC_HOST_H */