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 16 #include <linux/mmc/core.h> 17 #include <linux/mmc/pm.h> 18 19 struct mmc_ios { 20 unsigned int clock; /* clock rate */ 21 unsigned short vdd; 22 23 /* vdd stores the bit number of the selected voltage range from below. */ 24 25 unsigned char bus_mode; /* command output mode */ 26 27 #define MMC_BUSMODE_OPENDRAIN 1 28 #define MMC_BUSMODE_PUSHPULL 2 29 30 unsigned char chip_select; /* SPI chip select */ 31 32 #define MMC_CS_DONTCARE 0 33 #define MMC_CS_HIGH 1 34 #define MMC_CS_LOW 2 35 36 unsigned char power_mode; /* power supply mode */ 37 38 #define MMC_POWER_OFF 0 39 #define MMC_POWER_UP 1 40 #define MMC_POWER_ON 2 41 42 unsigned char bus_width; /* data bus width */ 43 44 #define MMC_BUS_WIDTH_1 0 45 #define MMC_BUS_WIDTH_4 2 46 #define MMC_BUS_WIDTH_8 3 47 48 unsigned char timing; /* timing specification used */ 49 50 #define MMC_TIMING_LEGACY 0 51 #define MMC_TIMING_MMC_HS 1 52 #define MMC_TIMING_SD_HS 2 53 }; 54 55 struct mmc_host_ops { 56 /* 57 * Hosts that support power saving can use the 'enable' and 'disable' 58 * methods to exit and enter power saving states. 'enable' is called 59 * when the host is claimed and 'disable' is called (or scheduled with 60 * a delay) when the host is released. The 'disable' is scheduled if 61 * the disable delay set by 'mmc_set_disable_delay()' is non-zero, 62 * otherwise 'disable' is called immediately. 'disable' may be 63 * scheduled repeatedly, to permit ever greater power saving at the 64 * expense of ever greater latency to re-enable. Rescheduling is 65 * determined by the return value of the 'disable' method. A positive 66 * value gives the delay in milliseconds. 67 * 68 * In the case where a host function (like set_ios) may be called 69 * with or without the host claimed, enabling and disabling can be 70 * done directly and will nest correctly. Call 'mmc_host_enable()' and 71 * 'mmc_host_lazy_disable()' for this purpose, but note that these 72 * functions must be paired. 73 * 74 * Alternatively, 'mmc_host_enable()' may be paired with 75 * 'mmc_host_disable()' which calls 'disable' immediately. In this 76 * case the 'disable' method will be called with 'lazy' set to 0. 77 * This is mainly useful for error paths. 78 * 79 * Because lazy disable may be called from a work queue, the 'disable' 80 * method must claim the host when 'lazy' != 0, which will work 81 * correctly because recursion is detected and handled. 82 */ 83 int (*enable)(struct mmc_host *host); 84 int (*disable)(struct mmc_host *host, int lazy); 85 void (*request)(struct mmc_host *host, struct mmc_request *req); 86 /* 87 * Avoid calling these three functions too often or in a "fast path", 88 * since underlaying controller might implement them in an expensive 89 * and/or slow way. 90 * 91 * Also note that these functions might sleep, so don't call them 92 * in the atomic contexts! 93 * 94 * Return values for the get_ro callback should be: 95 * 0 for a read/write card 96 * 1 for a read-only card 97 * -ENOSYS when not supported (equal to NULL callback) 98 * or a negative errno value when something bad happened 99 * 100 * Return values for the get_cd callback should be: 101 * 0 for a absent card 102 * 1 for a present card 103 * -ENOSYS when not supported (equal to NULL callback) 104 * or a negative errno value when something bad happened 105 */ 106 void (*set_ios)(struct mmc_host *host, struct mmc_ios *ios); 107 int (*get_ro)(struct mmc_host *host); 108 int (*get_cd)(struct mmc_host *host); 109 110 void (*enable_sdio_irq)(struct mmc_host *host, int enable); 111 }; 112 113 struct mmc_card; 114 struct device; 115 116 struct mmc_host { 117 struct device *parent; 118 struct device class_dev; 119 int index; 120 const struct mmc_host_ops *ops; 121 unsigned int f_min; 122 unsigned int f_max; 123 u32 ocr_avail; 124 125 #define MMC_VDD_165_195 0x00000080 /* VDD voltage 1.65 - 1.95 */ 126 #define MMC_VDD_20_21 0x00000100 /* VDD voltage 2.0 ~ 2.1 */ 127 #define MMC_VDD_21_22 0x00000200 /* VDD voltage 2.1 ~ 2.2 */ 128 #define MMC_VDD_22_23 0x00000400 /* VDD voltage 2.2 ~ 2.3 */ 129 #define MMC_VDD_23_24 0x00000800 /* VDD voltage 2.3 ~ 2.4 */ 130 #define MMC_VDD_24_25 0x00001000 /* VDD voltage 2.4 ~ 2.5 */ 131 #define MMC_VDD_25_26 0x00002000 /* VDD voltage 2.5 ~ 2.6 */ 132 #define MMC_VDD_26_27 0x00004000 /* VDD voltage 2.6 ~ 2.7 */ 133 #define MMC_VDD_27_28 0x00008000 /* VDD voltage 2.7 ~ 2.8 */ 134 #define MMC_VDD_28_29 0x00010000 /* VDD voltage 2.8 ~ 2.9 */ 135 #define MMC_VDD_29_30 0x00020000 /* VDD voltage 2.9 ~ 3.0 */ 136 #define MMC_VDD_30_31 0x00040000 /* VDD voltage 3.0 ~ 3.1 */ 137 #define MMC_VDD_31_32 0x00080000 /* VDD voltage 3.1 ~ 3.2 */ 138 #define MMC_VDD_32_33 0x00100000 /* VDD voltage 3.2 ~ 3.3 */ 139 #define MMC_VDD_33_34 0x00200000 /* VDD voltage 3.3 ~ 3.4 */ 140 #define MMC_VDD_34_35 0x00400000 /* VDD voltage 3.4 ~ 3.5 */ 141 #define MMC_VDD_35_36 0x00800000 /* VDD voltage 3.5 ~ 3.6 */ 142 143 unsigned long caps; /* Host capabilities */ 144 145 #define MMC_CAP_4_BIT_DATA (1 << 0) /* Can the host do 4 bit transfers */ 146 #define MMC_CAP_MMC_HIGHSPEED (1 << 1) /* Can do MMC high-speed timing */ 147 #define MMC_CAP_SD_HIGHSPEED (1 << 2) /* Can do SD high-speed timing */ 148 #define MMC_CAP_SDIO_IRQ (1 << 3) /* Can signal pending SDIO IRQs */ 149 #define MMC_CAP_SPI (1 << 4) /* Talks only SPI protocols */ 150 #define MMC_CAP_NEEDS_POLL (1 << 5) /* Needs polling for card-detection */ 151 #define MMC_CAP_8_BIT_DATA (1 << 6) /* Can the host do 8 bit transfers */ 152 #define MMC_CAP_DISABLE (1 << 7) /* Can the host be disabled */ 153 #define MMC_CAP_NONREMOVABLE (1 << 8) /* Nonremovable e.g. eMMC */ 154 #define MMC_CAP_WAIT_WHILE_BUSY (1 << 9) /* Waits while card is busy */ 155 156 mmc_pm_flag_t pm_caps; /* supported pm features */ 157 158 /* host specific block data */ 159 unsigned int max_seg_size; /* see blk_queue_max_segment_size */ 160 unsigned short max_hw_segs; /* see blk_queue_max_hw_segments */ 161 unsigned short max_phys_segs; /* see blk_queue_max_phys_segments */ 162 unsigned short unused; 163 unsigned int max_req_size; /* maximum number of bytes in one req */ 164 unsigned int max_blk_size; /* maximum size of one mmc block */ 165 unsigned int max_blk_count; /* maximum number of blocks in one req */ 166 167 /* private data */ 168 spinlock_t lock; /* lock for claim and bus ops */ 169 170 struct mmc_ios ios; /* current io bus settings */ 171 u32 ocr; /* the current OCR setting */ 172 173 /* group bitfields together to minimize padding */ 174 unsigned int use_spi_crc:1; 175 unsigned int claimed:1; /* host exclusively claimed */ 176 unsigned int bus_dead:1; /* bus has been released */ 177 #ifdef CONFIG_MMC_DEBUG 178 unsigned int removed:1; /* host is being removed */ 179 #endif 180 181 /* Only used with MMC_CAP_DISABLE */ 182 int enabled; /* host is enabled */ 183 int nesting_cnt; /* "enable" nesting count */ 184 int en_dis_recurs; /* detect recursion */ 185 unsigned int disable_delay; /* disable delay in msecs */ 186 struct delayed_work disable; /* disabling work */ 187 188 struct mmc_card *card; /* device attached to this host */ 189 190 wait_queue_head_t wq; 191 struct task_struct *claimer; /* task that has host claimed */ 192 int claim_cnt; /* "claim" nesting count */ 193 194 struct delayed_work detect; 195 196 const struct mmc_bus_ops *bus_ops; /* current bus driver */ 197 unsigned int bus_refs; /* reference counter */ 198 199 unsigned int sdio_irqs; 200 struct task_struct *sdio_irq_thread; 201 atomic_t sdio_irq_thread_abort; 202 203 mmc_pm_flag_t pm_flags; /* requested pm features */ 204 205 #ifdef CONFIG_LEDS_TRIGGERS 206 struct led_trigger *led; /* activity led */ 207 #endif 208 209 struct dentry *debugfs_root; 210 211 unsigned long private[0] ____cacheline_aligned; 212 }; 213 214 extern struct mmc_host *mmc_alloc_host(int extra, struct device *); 215 extern int mmc_add_host(struct mmc_host *); 216 extern void mmc_remove_host(struct mmc_host *); 217 extern void mmc_free_host(struct mmc_host *); 218 219 static inline void *mmc_priv(struct mmc_host *host) 220 { 221 return (void *)host->private; 222 } 223 224 #define mmc_host_is_spi(host) ((host)->caps & MMC_CAP_SPI) 225 226 #define mmc_dev(x) ((x)->parent) 227 #define mmc_classdev(x) (&(x)->class_dev) 228 #define mmc_hostname(x) (dev_name(&(x)->class_dev)) 229 230 extern int mmc_suspend_host(struct mmc_host *, pm_message_t); 231 extern int mmc_resume_host(struct mmc_host *); 232 233 extern void mmc_power_save_host(struct mmc_host *host); 234 extern void mmc_power_restore_host(struct mmc_host *host); 235 236 extern void mmc_detect_change(struct mmc_host *, unsigned long delay); 237 extern void mmc_request_done(struct mmc_host *, struct mmc_request *); 238 239 static inline void mmc_signal_sdio_irq(struct mmc_host *host) 240 { 241 host->ops->enable_sdio_irq(host, 0); 242 wake_up_process(host->sdio_irq_thread); 243 } 244 245 struct regulator; 246 247 int mmc_regulator_get_ocrmask(struct regulator *supply); 248 int mmc_regulator_set_ocr(struct regulator *supply, unsigned short vdd_bit); 249 250 int mmc_card_awake(struct mmc_host *host); 251 int mmc_card_sleep(struct mmc_host *host); 252 int mmc_card_can_sleep(struct mmc_host *host); 253 254 int mmc_host_enable(struct mmc_host *host); 255 int mmc_host_disable(struct mmc_host *host); 256 int mmc_host_lazy_disable(struct mmc_host *host); 257 258 static inline void mmc_set_disable_delay(struct mmc_host *host, 259 unsigned int disable_delay) 260 { 261 host->disable_delay = disable_delay; 262 } 263 264 #endif 265 266