2 * linux/include/linux/mmc/host.h
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.
8 * Host driver specific definitions.
10 #ifndef LINUX_MMC_HOST_H
11 #define LINUX_MMC_HOST_H
13 #include <linux/leds.h>
14 #include <linux/sched.h>
16 #include <linux/mmc/core.h>
19 unsigned int clock; /* clock rate */
22 /* vdd stores the bit number of the selected voltage range from below. */
24 unsigned char bus_mode; /* command output mode */
26 #define MMC_BUSMODE_OPENDRAIN 1
27 #define MMC_BUSMODE_PUSHPULL 2
29 unsigned char chip_select; /* SPI chip select */
31 #define MMC_CS_DONTCARE 0
35 unsigned char power_mode; /* power supply mode */
37 #define MMC_POWER_OFF 0
38 #define MMC_POWER_UP 1
39 #define MMC_POWER_ON 2
41 unsigned char bus_width; /* data bus width */
43 #define MMC_BUS_WIDTH_1 0
44 #define MMC_BUS_WIDTH_4 2
45 #define MMC_BUS_WIDTH_8 3
47 unsigned char timing; /* timing specification used */
49 #define MMC_TIMING_LEGACY 0
50 #define MMC_TIMING_MMC_HS 1
51 #define MMC_TIMING_SD_HS 2
56 * Hosts that support power saving can use the 'enable' and 'disable'
57 * methods to exit and enter power saving states. 'enable' is called
58 * when the host is claimed and 'disable' is called (or scheduled with
59 * a delay) when the host is released. The 'disable' is scheduled if
60 * the disable delay set by 'mmc_set_disable_delay()' is non-zero,
61 * otherwise 'disable' is called immediately. 'disable' may be
62 * scheduled repeatedly, to permit ever greater power saving at the
63 * expense of ever greater latency to re-enable. Rescheduling is
64 * determined by the return value of the 'disable' method. A positive
65 * value gives the delay in milliseconds.
67 * In the case where a host function (like set_ios) may be called
68 * with or without the host claimed, enabling and disabling can be
69 * done directly and will nest correctly. Call 'mmc_host_enable()' and
70 * 'mmc_host_lazy_disable()' for this purpose, but note that these
71 * functions must be paired.
73 * Alternatively, 'mmc_host_enable()' may be paired with
74 * 'mmc_host_disable()' which calls 'disable' immediately. In this
75 * case the 'disable' method will be called with 'lazy' set to 0.
76 * This is mainly useful for error paths.
78 * Because lazy disable may be called from a work queue, the 'disable'
79 * method must claim the host when 'lazy' != 0, which will work
80 * correctly because recursion is detected and handled.
82 int (*enable)(struct mmc_host *host);
83 int (*disable)(struct mmc_host *host, int lazy);
84 void (*request)(struct mmc_host *host, struct mmc_request *req);
86 * Avoid calling these three functions too often or in a "fast path",
87 * since underlaying controller might implement them in an expensive
90 * Also note that these functions might sleep, so don't call them
91 * in the atomic contexts!
93 * Return values for the get_ro callback should be:
94 * 0 for a read/write card
95 * 1 for a read-only card
96 * -ENOSYS when not supported (equal to NULL callback)
97 * or a negative errno value when something bad happened
99 * Return values for the get_cd callback should be:
100 * 0 for a absent card
101 * 1 for a present card
102 * -ENOSYS when not supported (equal to NULL callback)
103 * or a negative errno value when something bad happened
105 void (*set_ios)(struct mmc_host *host, struct mmc_ios *ios);
106 int (*get_ro)(struct mmc_host *host);
107 int (*get_cd)(struct mmc_host *host);
109 void (*enable_sdio_irq)(struct mmc_host *host, int enable);
111 /* optional callback for HC quirks */
112 void (*init_card)(struct mmc_host *host, struct mmc_card *card);
119 struct device *parent;
120 struct device class_dev;
122 const struct mmc_host_ops *ops;
126 struct notifier_block pm_notify;
128 #define MMC_VDD_165_195 0x00000080 /* VDD voltage 1.65 - 1.95 */
129 #define MMC_VDD_20_21 0x00000100 /* VDD voltage 2.0 ~ 2.1 */
130 #define MMC_VDD_21_22 0x00000200 /* VDD voltage 2.1 ~ 2.2 */
131 #define MMC_VDD_22_23 0x00000400 /* VDD voltage 2.2 ~ 2.3 */
132 #define MMC_VDD_23_24 0x00000800 /* VDD voltage 2.3 ~ 2.4 */
133 #define MMC_VDD_24_25 0x00001000 /* VDD voltage 2.4 ~ 2.5 */
134 #define MMC_VDD_25_26 0x00002000 /* VDD voltage 2.5 ~ 2.6 */
135 #define MMC_VDD_26_27 0x00004000 /* VDD voltage 2.6 ~ 2.7 */
136 #define MMC_VDD_27_28 0x00008000 /* VDD voltage 2.7 ~ 2.8 */
137 #define MMC_VDD_28_29 0x00010000 /* VDD voltage 2.8 ~ 2.9 */
138 #define MMC_VDD_29_30 0x00020000 /* VDD voltage 2.9 ~ 3.0 */
139 #define MMC_VDD_30_31 0x00040000 /* VDD voltage 3.0 ~ 3.1 */
140 #define MMC_VDD_31_32 0x00080000 /* VDD voltage 3.1 ~ 3.2 */
141 #define MMC_VDD_32_33 0x00100000 /* VDD voltage 3.2 ~ 3.3 */
142 #define MMC_VDD_33_34 0x00200000 /* VDD voltage 3.3 ~ 3.4 */
143 #define MMC_VDD_34_35 0x00400000 /* VDD voltage 3.4 ~ 3.5 */
144 #define MMC_VDD_35_36 0x00800000 /* VDD voltage 3.5 ~ 3.6 */
146 unsigned long caps; /* Host capabilities */
148 #define MMC_CAP_4_BIT_DATA (1 << 0) /* Can the host do 4 bit transfers */
149 #define MMC_CAP_MMC_HIGHSPEED (1 << 1) /* Can do MMC high-speed timing */
150 #define MMC_CAP_SD_HIGHSPEED (1 << 2) /* Can do SD high-speed timing */
151 #define MMC_CAP_SDIO_IRQ (1 << 3) /* Can signal pending SDIO IRQs */
152 #define MMC_CAP_SPI (1 << 4) /* Talks only SPI protocols */
153 #define MMC_CAP_NEEDS_POLL (1 << 5) /* Needs polling for card-detection */
154 #define MMC_CAP_8_BIT_DATA (1 << 6) /* Can the host do 8 bit transfers */
155 #define MMC_CAP_DISABLE (1 << 7) /* Can the host be disabled */
156 #define MMC_CAP_NONREMOVABLE (1 << 8) /* Nonremovable e.g. eMMC */
157 #define MMC_CAP_WAIT_WHILE_BUSY (1 << 9) /* Waits while card is busy */
159 /* host specific block data */
160 unsigned int max_seg_size; /* see blk_queue_max_segment_size */
161 unsigned short max_hw_segs; /* see blk_queue_max_hw_segments */
162 unsigned short max_phys_segs; /* see blk_queue_max_phys_segments */
163 unsigned short unused;
164 unsigned int max_req_size; /* maximum number of bytes in one req */
165 unsigned int max_blk_size; /* maximum size of one mmc block */
166 unsigned int max_blk_count; /* maximum number of blocks in one req */
169 spinlock_t lock; /* lock for claim and bus ops */
171 struct mmc_ios ios; /* current io bus settings */
172 u32 ocr; /* the current OCR setting */
174 /* group bitfields together to minimize padding */
175 unsigned int use_spi_crc:1;
176 unsigned int claimed:1; /* host exclusively claimed */
177 unsigned int bus_dead:1; /* bus has been released */
178 #ifdef CONFIG_MMC_DEBUG
179 unsigned int removed:1; /* host is being removed */
182 /* Only used with MMC_CAP_DISABLE */
183 int enabled; /* host is enabled */
184 int rescan_disable; /* disable card detection */
185 int nesting_cnt; /* "enable" nesting count */
186 int en_dis_recurs; /* detect recursion */
187 unsigned int disable_delay; /* disable delay in msecs */
188 struct delayed_work disable; /* disabling work */
190 struct mmc_card *card; /* device attached to this host */
192 wait_queue_head_t wq;
193 struct task_struct *claimer; /* task that has host claimed */
194 int claim_cnt; /* "claim" nesting count */
196 struct delayed_work detect;
198 const struct mmc_bus_ops *bus_ops; /* current bus driver */
199 unsigned int bus_refs; /* reference counter */
201 unsigned int bus_resume_flags;
202 #define MMC_BUSRESUME_MANUAL_RESUME (1 << 0)
203 #define MMC_BUSRESUME_NEEDS_RESUME (1 << 1)
205 unsigned int sdio_irqs;
206 struct task_struct *sdio_irq_thread;
207 atomic_t sdio_irq_thread_abort;
209 #ifdef CONFIG_LEDS_TRIGGERS
210 struct led_trigger *led; /* activity led */
213 struct dentry *debugfs_root;
215 #ifdef CONFIG_MMC_EMBEDDED_SDIO
217 struct sdio_cis *cis;
218 struct sdio_cccr *cccr;
219 struct sdio_embedded_func *funcs;
221 } embedded_sdio_data;
224 unsigned long private[0] ____cacheline_aligned;
227 extern struct mmc_host *mmc_alloc_host(int extra, struct device *);
228 extern int mmc_add_host(struct mmc_host *);
229 extern void mmc_remove_host(struct mmc_host *);
230 extern void mmc_free_host(struct mmc_host *);
232 #ifdef CONFIG_MMC_EMBEDDED_SDIO
233 extern void mmc_set_embedded_sdio_data(struct mmc_host *host,
234 struct sdio_cis *cis,
235 struct sdio_cccr *cccr,
236 struct sdio_embedded_func *funcs,
240 static inline void *mmc_priv(struct mmc_host *host)
242 return (void *)host->private;
245 #define mmc_host_is_spi(host) ((host)->caps & MMC_CAP_SPI)
247 #define mmc_dev(x) ((x)->parent)
248 #define mmc_classdev(x) (&(x)->class_dev)
249 #define mmc_hostname(x) (dev_name(&(x)->class_dev))
250 #define mmc_bus_needs_resume(host) ((host)->bus_resume_flags & MMC_BUSRESUME_NEEDS_RESUME)
252 static inline void mmc_set_bus_resume_policy(struct mmc_host *host, int manual)
255 host->bus_resume_flags |= MMC_BUSRESUME_MANUAL_RESUME;
257 host->bus_resume_flags &= ~MMC_BUSRESUME_MANUAL_RESUME;
260 extern int mmc_resume_bus(struct mmc_host *host);
262 extern int mmc_suspend_host(struct mmc_host *, pm_message_t);
263 extern int mmc_resume_host(struct mmc_host *);
265 extern void mmc_power_save_host(struct mmc_host *host);
266 extern void mmc_power_restore_host(struct mmc_host *host);
268 extern void mmc_detect_change(struct mmc_host *, unsigned long delay);
269 extern void mmc_request_done(struct mmc_host *, struct mmc_request *);
271 static inline void mmc_signal_sdio_irq(struct mmc_host *host)
273 host->ops->enable_sdio_irq(host, 0);
274 wake_up_process(host->sdio_irq_thread);
279 int mmc_regulator_get_ocrmask(struct regulator *supply);
280 int mmc_regulator_set_ocr(struct regulator *supply, unsigned short vdd_bit);
282 int mmc_card_awake(struct mmc_host *host);
283 int mmc_card_sleep(struct mmc_host *host);
284 int mmc_card_can_sleep(struct mmc_host *host);
286 int mmc_host_enable(struct mmc_host *host);
287 int mmc_host_disable(struct mmc_host *host);
288 int mmc_host_lazy_disable(struct mmc_host *host);
289 int mmc_pm_notify(struct notifier_block *notify_block, unsigned long, void *);
291 static inline void mmc_set_disable_delay(struct mmc_host *host,
292 unsigned int disable_delay)
294 host->disable_delay = disable_delay;