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>
17 #include <linux/mmc/pm.h>
20 unsigned int clock; /* clock rate */
23 /* vdd stores the bit number of the selected voltage range from below. */
25 unsigned char bus_mode; /* command output mode */
27 #define MMC_BUSMODE_OPENDRAIN 1
28 #define MMC_BUSMODE_PUSHPULL 2
30 unsigned char chip_select; /* SPI chip select */
32 #define MMC_CS_DONTCARE 0
36 unsigned char power_mode; /* power supply mode */
38 #define MMC_POWER_OFF 0
39 #define MMC_POWER_UP 1
40 #define MMC_POWER_ON 2
42 unsigned char bus_width; /* data bus width */
44 #define MMC_BUS_WIDTH_1 0
45 #define MMC_BUS_WIDTH_4 2
46 #define MMC_BUS_WIDTH_8 3
48 unsigned char timing; /* timing specification used */
50 #define MMC_TIMING_LEGACY 0
51 #define MMC_TIMING_MMC_HS 1
52 #define MMC_TIMING_SD_HS 2
54 unsigned char ddr; /* dual data rate used */
56 #define MMC_SDR_MODE 0
57 #define MMC_1_2V_DDR_MODE 1
58 #define MMC_1_8V_DDR_MODE 2
60 unsigned char signal_voltage; /* signalling voltage (1.8V or 3.3V) */
62 #define MMC_SIGNAL_VOLTAGE_330 0
63 #define MMC_SIGNAL_VOLTAGE_180 1
68 * Hosts that support power saving can use the 'enable' and 'disable'
69 * methods to exit and enter power saving states. 'enable' is called
70 * when the host is claimed and 'disable' is called (or scheduled with
71 * a delay) when the host is released. The 'disable' is scheduled if
72 * the disable delay set by 'mmc_set_disable_delay()' is non-zero,
73 * otherwise 'disable' is called immediately. 'disable' may be
74 * scheduled repeatedly, to permit ever greater power saving at the
75 * expense of ever greater latency to re-enable. Rescheduling is
76 * determined by the return value of the 'disable' method. A positive
77 * value gives the delay in milliseconds.
79 * In the case where a host function (like set_ios) may be called
80 * with or without the host claimed, enabling and disabling can be
81 * done directly and will nest correctly. Call 'mmc_host_enable()' and
82 * 'mmc_host_lazy_disable()' for this purpose, but note that these
83 * functions must be paired.
85 * Alternatively, 'mmc_host_enable()' may be paired with
86 * 'mmc_host_disable()' which calls 'disable' immediately. In this
87 * case the 'disable' method will be called with 'lazy' set to 0.
88 * This is mainly useful for error paths.
90 * Because lazy disable may be called from a work queue, the 'disable'
91 * method must claim the host when 'lazy' != 0, which will work
92 * correctly because recursion is detected and handled.
94 int (*enable)(struct mmc_host *host);
95 int (*disable)(struct mmc_host *host, int lazy);
96 void (*request)(struct mmc_host *host, struct mmc_request *req);
98 * Avoid calling these three functions too often or in a "fast path",
99 * since underlaying controller might implement them in an expensive
102 * Also note that these functions might sleep, so don't call them
103 * in the atomic contexts!
105 * Return values for the get_ro callback should be:
106 * 0 for a read/write card
107 * 1 for a read-only card
108 * -ENOSYS when not supported (equal to NULL callback)
109 * or a negative errno value when something bad happened
111 * Return values for the get_cd callback should be:
112 * 0 for a absent card
113 * 1 for a present card
114 * -ENOSYS when not supported (equal to NULL callback)
115 * or a negative errno value when something bad happened
117 void (*set_ios)(struct mmc_host *host, struct mmc_ios *ios);
118 int (*get_ro)(struct mmc_host *host);
119 int (*get_cd)(struct mmc_host *host);
121 void (*enable_sdio_irq)(struct mmc_host *host, int enable);
123 /* optional callback for HC quirks */
124 void (*init_card)(struct mmc_host *host, struct mmc_card *card);
126 int (*start_signal_voltage_switch)(struct mmc_host *host, struct mmc_ios *ios);
133 struct device *parent;
134 struct device class_dev;
136 const struct mmc_host_ops *ops;
141 u32 ocr_avail_sdio; /* SDIO-specific OCR */
142 u32 ocr_avail_sd; /* SD-specific OCR */
143 u32 ocr_avail_mmc; /* MMC-specific OCR */
144 struct notifier_block pm_notify;
146 #define MMC_VDD_165_195 0x00000080 /* VDD voltage 1.65 - 1.95 */
147 #define MMC_VDD_20_21 0x00000100 /* VDD voltage 2.0 ~ 2.1 */
148 #define MMC_VDD_21_22 0x00000200 /* VDD voltage 2.1 ~ 2.2 */
149 #define MMC_VDD_22_23 0x00000400 /* VDD voltage 2.2 ~ 2.3 */
150 #define MMC_VDD_23_24 0x00000800 /* VDD voltage 2.3 ~ 2.4 */
151 #define MMC_VDD_24_25 0x00001000 /* VDD voltage 2.4 ~ 2.5 */
152 #define MMC_VDD_25_26 0x00002000 /* VDD voltage 2.5 ~ 2.6 */
153 #define MMC_VDD_26_27 0x00004000 /* VDD voltage 2.6 ~ 2.7 */
154 #define MMC_VDD_27_28 0x00008000 /* VDD voltage 2.7 ~ 2.8 */
155 #define MMC_VDD_28_29 0x00010000 /* VDD voltage 2.8 ~ 2.9 */
156 #define MMC_VDD_29_30 0x00020000 /* VDD voltage 2.9 ~ 3.0 */
157 #define MMC_VDD_30_31 0x00040000 /* VDD voltage 3.0 ~ 3.1 */
158 #define MMC_VDD_31_32 0x00080000 /* VDD voltage 3.1 ~ 3.2 */
159 #define MMC_VDD_32_33 0x00100000 /* VDD voltage 3.2 ~ 3.3 */
160 #define MMC_VDD_33_34 0x00200000 /* VDD voltage 3.3 ~ 3.4 */
161 #define MMC_VDD_34_35 0x00400000 /* VDD voltage 3.4 ~ 3.5 */
162 #define MMC_VDD_35_36 0x00800000 /* VDD voltage 3.5 ~ 3.6 */
164 unsigned long caps; /* Host capabilities */
166 #define MMC_CAP_4_BIT_DATA (1 << 0) /* Can the host do 4 bit transfers */
167 #define MMC_CAP_MMC_HIGHSPEED (1 << 1) /* Can do MMC high-speed timing */
168 #define MMC_CAP_SD_HIGHSPEED (1 << 2) /* Can do SD high-speed timing */
169 #define MMC_CAP_SDIO_IRQ (1 << 3) /* Can signal pending SDIO IRQs */
170 #define MMC_CAP_SPI (1 << 4) /* Talks only SPI protocols */
171 #define MMC_CAP_NEEDS_POLL (1 << 5) /* Needs polling for card-detection */
172 #define MMC_CAP_8_BIT_DATA (1 << 6) /* Can the host do 8 bit transfers */
173 #define MMC_CAP_DISABLE (1 << 7) /* Can the host be disabled */
174 #define MMC_CAP_NONREMOVABLE (1 << 8) /* Nonremovable e.g. eMMC */
175 #define MMC_CAP_WAIT_WHILE_BUSY (1 << 9) /* Waits while card is busy */
176 #define MMC_CAP_ERASE (1 << 10) /* Allow erase/trim commands */
177 #define MMC_CAP_1_8V_DDR (1 << 11) /* can support */
178 /* DDR mode at 1.8V */
179 #define MMC_CAP_1_2V_DDR (1 << 12) /* can support */
180 /* DDR mode at 1.2V */
181 #define MMC_CAP_POWER_OFF_CARD (1 << 13) /* Can power off after boot */
182 #define MMC_CAP_BUS_WIDTH_TEST (1 << 14) /* CMD14/CMD19 bus width ok */
183 #define MMC_CAP_UHS_SDR12 (1 << 15) /* Host supports UHS SDR12 mode */
184 #define MMC_CAP_UHS_SDR25 (1 << 16) /* Host supports UHS SDR25 mode */
185 #define MMC_CAP_UHS_SDR50 (1 << 17) /* Host supports UHS SDR50 mode */
186 #define MMC_CAP_UHS_SDR104 (1 << 18) /* Host supports UHS SDR104 mode */
187 #define MMC_CAP_UHS_DDR50 (1 << 19) /* Host supports UHS DDR50 mode */
188 #define MMC_CAP_SET_XPC_330 (1 << 20) /* Host supports >150mA current at 3.3V */
189 #define MMC_CAP_SET_XPC_300 (1 << 21) /* Host supports >150mA current at 3.0V */
190 #define MMC_CAP_SET_XPC_180 (1 << 22) /* Host supports >150mA current at 1.8V */
192 mmc_pm_flag_t pm_caps; /* supported pm features */
194 #ifdef CONFIG_MMC_CLKGATE
195 int clk_requests; /* internal reference counter */
196 unsigned int clk_delay; /* number of MCI clk hold cycles */
197 bool clk_gated; /* clock gated */
198 struct work_struct clk_gate_work; /* delayed clock gate */
199 unsigned int clk_old; /* old clock value cache */
200 spinlock_t clk_lock; /* lock for clk fields */
203 /* host specific block data */
204 unsigned int max_seg_size; /* see blk_queue_max_segment_size */
205 unsigned short max_segs; /* see blk_queue_max_segments */
206 unsigned short unused;
207 unsigned int max_req_size; /* maximum number of bytes in one req */
208 unsigned int max_blk_size; /* maximum size of one mmc block */
209 unsigned int max_blk_count; /* maximum number of blocks in one req */
212 spinlock_t lock; /* lock for claim and bus ops */
214 struct mmc_ios ios; /* current io bus settings */
215 u32 ocr; /* the current OCR setting */
217 /* group bitfields together to minimize padding */
218 unsigned int use_spi_crc:1;
219 unsigned int claimed:1; /* host exclusively claimed */
220 unsigned int bus_dead:1; /* bus has been released */
221 #ifdef CONFIG_MMC_DEBUG
222 unsigned int removed:1; /* host is being removed */
225 /* Only used with MMC_CAP_DISABLE */
226 int enabled; /* host is enabled */
227 int rescan_disable; /* disable card detection */
228 int nesting_cnt; /* "enable" nesting count */
229 int en_dis_recurs; /* detect recursion */
230 unsigned int disable_delay; /* disable delay in msecs */
231 struct delayed_work disable; /* disabling work */
233 struct mmc_card *card; /* device attached to this host */
235 wait_queue_head_t wq;
236 struct task_struct *claimer; /* task that has host claimed */
237 int claim_cnt; /* "claim" nesting count */
239 struct delayed_work detect;
241 const struct mmc_bus_ops *bus_ops; /* current bus driver */
242 unsigned int bus_refs; /* reference counter */
244 unsigned int sdio_irqs;
245 struct task_struct *sdio_irq_thread;
246 atomic_t sdio_irq_thread_abort;
248 mmc_pm_flag_t pm_flags; /* requested pm features */
250 #ifdef CONFIG_LEDS_TRIGGERS
251 struct led_trigger *led; /* activity led */
254 #ifdef CONFIG_REGULATOR
255 bool regulator_enabled; /* regulator state */
258 struct dentry *debugfs_root;
260 unsigned long private[0] ____cacheline_aligned;
263 extern struct mmc_host *mmc_alloc_host(int extra, struct device *);
264 extern int mmc_add_host(struct mmc_host *);
265 extern void mmc_remove_host(struct mmc_host *);
266 extern void mmc_free_host(struct mmc_host *);
268 static inline void *mmc_priv(struct mmc_host *host)
270 return (void *)host->private;
273 #define mmc_host_is_spi(host) ((host)->caps & MMC_CAP_SPI)
275 #define mmc_dev(x) ((x)->parent)
276 #define mmc_classdev(x) (&(x)->class_dev)
277 #define mmc_hostname(x) (dev_name(&(x)->class_dev))
279 extern int mmc_suspend_host(struct mmc_host *);
280 extern int mmc_resume_host(struct mmc_host *);
282 extern int mmc_power_save_host(struct mmc_host *host);
283 extern int mmc_power_restore_host(struct mmc_host *host);
285 extern void mmc_detect_change(struct mmc_host *, unsigned long delay);
286 extern void mmc_request_done(struct mmc_host *, struct mmc_request *);
288 static inline void mmc_signal_sdio_irq(struct mmc_host *host)
290 host->ops->enable_sdio_irq(host, 0);
291 wake_up_process(host->sdio_irq_thread);
296 #ifdef CONFIG_REGULATOR
297 int mmc_regulator_get_ocrmask(struct regulator *supply);
298 int mmc_regulator_set_ocr(struct mmc_host *mmc,
299 struct regulator *supply,
300 unsigned short vdd_bit);
302 static inline int mmc_regulator_get_ocrmask(struct regulator *supply)
307 static inline int mmc_regulator_set_ocr(struct mmc_host *mmc,
308 struct regulator *supply,
309 unsigned short vdd_bit)
315 int mmc_card_awake(struct mmc_host *host);
316 int mmc_card_sleep(struct mmc_host *host);
317 int mmc_card_can_sleep(struct mmc_host *host);
319 int mmc_host_enable(struct mmc_host *host);
320 int mmc_host_disable(struct mmc_host *host);
321 int mmc_host_lazy_disable(struct mmc_host *host);
322 int mmc_pm_notify(struct notifier_block *notify_block, unsigned long, void *);
324 static inline void mmc_set_disable_delay(struct mmc_host *host,
325 unsigned int disable_delay)
327 host->disable_delay = disable_delay;
330 /* Module parameter */
331 extern int mmc_assume_removable;
333 static inline int mmc_card_is_removable(struct mmc_host *host)
335 return !(host->caps & MMC_CAP_NONREMOVABLE) && mmc_assume_removable;
338 static inline int mmc_card_keep_power(struct mmc_host *host)
340 return host->pm_flags & MMC_PM_KEEP_POWER;
343 static inline int mmc_card_wake_sdio_irq(struct mmc_host *host)
345 return host->pm_flags & MMC_PM_WAKE_SDIO_IRQ;