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>
15 #include <linux/mmc/core.h>
18 unsigned int clock; /* clock rate */
21 /* vdd stores the bit number of the selected voltage range from below. */
23 unsigned char bus_mode; /* command output mode */
25 #define MMC_BUSMODE_OPENDRAIN 1
26 #define MMC_BUSMODE_PUSHPULL 2
28 unsigned char chip_select; /* SPI chip select */
30 #define MMC_CS_DONTCARE 0
34 unsigned char power_mode; /* power supply mode */
36 #define MMC_POWER_OFF 0
37 #define MMC_POWER_UP 1
38 #define MMC_POWER_ON 2
40 unsigned char bus_width; /* data bus width */
42 #define MMC_BUS_WIDTH_1 0
43 #define MMC_BUS_WIDTH_4 2
45 unsigned char timing; /* timing specification used */
47 #define MMC_TIMING_LEGACY 0
48 #define MMC_TIMING_MMC_HS 1
49 #define MMC_TIMING_SD_HS 2
53 void (*request)(struct mmc_host *host, struct mmc_request *req);
55 * Avoid calling these three functions too often or in a "fast path",
56 * since underlaying controller might implement them in an expensive
59 * Also note that these functions might sleep, so don't call them
60 * in the atomic contexts!
62 * Return values for the get_ro callback should be:
63 * 0 for a read/write card
64 * 1 for a read-only card
65 * -ENOSYS when not supported (equal to NULL callback)
66 * or a negative errno value when something bad happened
68 * Return values for the get_cd callback should be:
70 * 1 for a present card
71 * -ENOSYS when not supported (equal to NULL callback)
72 * or a negative errno value when something bad happened
74 void (*set_ios)(struct mmc_host *host, struct mmc_ios *ios);
75 int (*get_ro)(struct mmc_host *host);
76 int (*get_cd)(struct mmc_host *host);
78 void (*enable_sdio_irq)(struct mmc_host *host, int enable);
85 struct device *parent;
86 struct device class_dev;
88 const struct mmc_host_ops *ops;
93 #define MMC_VDD_165_195 0x00000080 /* VDD voltage 1.65 - 1.95 */
94 #define MMC_VDD_20_21 0x00000100 /* VDD voltage 2.0 ~ 2.1 */
95 #define MMC_VDD_21_22 0x00000200 /* VDD voltage 2.1 ~ 2.2 */
96 #define MMC_VDD_22_23 0x00000400 /* VDD voltage 2.2 ~ 2.3 */
97 #define MMC_VDD_23_24 0x00000800 /* VDD voltage 2.3 ~ 2.4 */
98 #define MMC_VDD_24_25 0x00001000 /* VDD voltage 2.4 ~ 2.5 */
99 #define MMC_VDD_25_26 0x00002000 /* VDD voltage 2.5 ~ 2.6 */
100 #define MMC_VDD_26_27 0x00004000 /* VDD voltage 2.6 ~ 2.7 */
101 #define MMC_VDD_27_28 0x00008000 /* VDD voltage 2.7 ~ 2.8 */
102 #define MMC_VDD_28_29 0x00010000 /* VDD voltage 2.8 ~ 2.9 */
103 #define MMC_VDD_29_30 0x00020000 /* VDD voltage 2.9 ~ 3.0 */
104 #define MMC_VDD_30_31 0x00040000 /* VDD voltage 3.0 ~ 3.1 */
105 #define MMC_VDD_31_32 0x00080000 /* VDD voltage 3.1 ~ 3.2 */
106 #define MMC_VDD_32_33 0x00100000 /* VDD voltage 3.2 ~ 3.3 */
107 #define MMC_VDD_33_34 0x00200000 /* VDD voltage 3.3 ~ 3.4 */
108 #define MMC_VDD_34_35 0x00400000 /* VDD voltage 3.4 ~ 3.5 */
109 #define MMC_VDD_35_36 0x00800000 /* VDD voltage 3.5 ~ 3.6 */
111 unsigned long caps; /* Host capabilities */
113 #define MMC_CAP_4_BIT_DATA (1 << 0) /* Can the host do 4 bit transfers */
114 #define MMC_CAP_MMC_HIGHSPEED (1 << 1) /* Can do MMC high-speed timing */
115 #define MMC_CAP_SD_HIGHSPEED (1 << 2) /* Can do SD high-speed timing */
116 #define MMC_CAP_SDIO_IRQ (1 << 3) /* Can signal pending SDIO IRQs */
117 #define MMC_CAP_SPI (1 << 4) /* Talks only SPI protocols */
118 #define MMC_CAP_NEEDS_POLL (1 << 5) /* Needs polling for card-detection */
120 /* host specific block data */
121 unsigned int max_seg_size; /* see blk_queue_max_segment_size */
122 unsigned short max_hw_segs; /* see blk_queue_max_hw_segments */
123 unsigned short max_phys_segs; /* see blk_queue_max_phys_segments */
124 unsigned short unused;
125 unsigned int max_req_size; /* maximum number of bytes in one req */
126 unsigned int max_blk_size; /* maximum size of one mmc block */
127 unsigned int max_blk_count; /* maximum number of blocks in one req */
130 spinlock_t lock; /* lock for claim and bus ops */
132 struct mmc_ios ios; /* current io bus settings */
133 u32 ocr; /* the current OCR setting */
135 /* group bitfields together to minimize padding */
136 unsigned int use_spi_crc:1;
137 unsigned int claimed:1; /* host exclusively claimed */
138 unsigned int bus_dead:1; /* bus has been released */
139 #ifdef CONFIG_MMC_DEBUG
140 unsigned int removed:1; /* host is being removed */
143 struct mmc_card *card; /* device attached to this host */
145 wait_queue_head_t wq;
147 struct delayed_work detect;
149 const struct mmc_bus_ops *bus_ops; /* current bus driver */
150 unsigned int bus_refs; /* reference counter */
152 unsigned int sdio_irqs;
153 struct task_struct *sdio_irq_thread;
154 atomic_t sdio_irq_thread_abort;
156 #ifdef CONFIG_LEDS_TRIGGERS
157 struct led_trigger *led; /* activity led */
160 struct dentry *debugfs_root;
162 unsigned long private[0] ____cacheline_aligned;
165 extern struct mmc_host *mmc_alloc_host(int extra, struct device *);
166 extern int mmc_add_host(struct mmc_host *);
167 extern void mmc_remove_host(struct mmc_host *);
168 extern void mmc_free_host(struct mmc_host *);
170 static inline void *mmc_priv(struct mmc_host *host)
172 return (void *)host->private;
175 #define mmc_host_is_spi(host) ((host)->caps & MMC_CAP_SPI)
177 #define mmc_dev(x) ((x)->parent)
178 #define mmc_classdev(x) (&(x)->class_dev)
179 #define mmc_hostname(x) ((x)->class_dev.bus_id)
181 extern int mmc_suspend_host(struct mmc_host *, pm_message_t);
182 extern int mmc_resume_host(struct mmc_host *);
184 extern void mmc_detect_change(struct mmc_host *, unsigned long delay);
185 extern void mmc_request_done(struct mmc_host *, struct mmc_request *);
187 static inline void mmc_signal_sdio_irq(struct mmc_host *host)
189 host->ops->enable_sdio_irq(host, 0);
190 wake_up_process(host->sdio_irq_thread);