drivers/mmc/core/core.h

   1 /*
   2  *  linux/drivers/mmc/core/core.h
   3  *
   4  *  Copyright (C) 2003 Russell King, All Rights Reserved.
   5  *  Copyright 2007 Pierre Ossman
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11 #ifndef _MMC_CORE_CORE_H
  12 #define _MMC_CORE_CORE_H
  13
  14 #include <linux/delay.h>
  15
  16 #define MMC_CMD_RETRIES        3
  17
  18 /* Spec says initialisation must happen at or below 400kHz.
  19  * Some MMC cards fail to initialise at 400kHz (even as low as 200kHz) and
  20  * Some host controllers (eg. tmio_mmc) cannot garantee to set the clock below
  21  * 400kHz (it rounds to the closest clock freq available).
  22  *
  23  * 64 kHz seems like a good speed/reliability compromise.
  24  */
  25
  26 #define MMC_INIT_FREQ      64000
  27
  28 struct mmc_bus_ops {
  29         int (*awake)(struct mmc_host *);
  30         int (*sleep)(struct mmc_host *);
  31         void (*remove)(struct mmc_host *);
  32         void (*detect)(struct mmc_host *);
  33         int (*suspend)(struct mmc_host *);
  34         int (*resume)(struct mmc_host *);
  35         void (*power_save)(struct mmc_host *);
  36         void (*power_restore)(struct mmc_host *);
  37 };
  38
  39 void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops);
  40 void mmc_detach_bus(struct mmc_host *host);
  41
  42 void mmc_set_chip_select(struct mmc_host *host, int mode);
  43 void mmc_set_clock(struct mmc_host *host, unsigned int hz);
  44 void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode);
  45 void mmc_set_bus_width(struct mmc_host *host, unsigned int width);
  46 u32 mmc_select_voltage(struct mmc_host *host, u32 ocr);
  47 void mmc_set_timing(struct mmc_host *host, unsigned int timing);
  48
  49 static inline void mmc_delay(unsigned int ms)
  50 {
  51         if (ms < 1000 / HZ) {
  52                 cond_resched();
  53                 mdelay(ms);
  54         } else {
  55                 msleep(ms);
  56         }
  57 }
  58
  59 void mmc_rescan(struct work_struct *work);
  60 void mmc_start_host(struct mmc_host *host);
  61 void mmc_stop_host(struct mmc_host *host);
  62
  63 int mmc_attach_mmc(struct mmc_host *host, u32 ocr);
  64 int mmc_attach_sd(struct mmc_host *host, u32 ocr);
  65 int mmc_attach_sdio(struct mmc_host *host, u32 ocr);
  66
  67 extern int use_spi_crc;
  68
  69 /* Debugfs information for hosts and cards */
  70 void mmc_add_host_debugfs(struct mmc_host *host);
  71 void mmc_remove_host_debugfs(struct mmc_host *host);
  72
  73 void mmc_add_card_debugfs(struct mmc_card *card);
  74 void mmc_remove_card_debugfs(struct mmc_card *card);
  75
  76 #endif
  77