text: /*
   *  linux/include/linux/mmc/mmc.h
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 as
   * published by the Free Software Foundation.
   */
  #ifndef MMC_H
  #define MMC_H
  
  #include <linux/list.h>
  #include <linux/interrupt.h>
  #include <linux/device.h>
  
  struct request;
  struct mmc_data;
  struct mmc_request;
  
  struct mmc_command {
  	u32			opcode;
  	u32			arg;
  	u32			resp[4];
  	unsigned int		flags;		/* expected response type */
  #define MMC_RSP_PRESENT	(1 << 0)
  #define MMC_RSP_136	(1 << 1)		/* 136 bit response */
  #define MMC_RSP_CRC	(1 << 2)		/* expect valid crc */
  #define MMC_RSP_BUSY	(1 << 3)		/* card may send busy */
  #define MMC_RSP_OPCODE	(1 << 4)		/* response contains opcode */
  #define MMC_CMD_MASK	(3 << 5)		/* command type */
  #define MMC_CMD_AC	(0 << 5)
  #define MMC_CMD_ADTC	(1 << 5)
  #define MMC_CMD_BC	(2 << 5)
  #define MMC_CMD_BCR	(3 << 5)
  
  /*
   * These are the response types, and correspond to valid bit
   * patterns of the above flags.  One additional valid pattern
   * is all zeros, which means we don't expect a response.
   */
  #define MMC_RSP_NONE	(0)
  #define MMC_RSP_R1	(MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE)
  #define MMC_RSP_R1B	(MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE|MMC_RSP_BUSY)
  #define MMC_RSP_R2	(MMC_RSP_PRESENT|MMC_RSP_136|MMC_RSP_CRC)
  #define MMC_RSP_R3	(MMC_RSP_PRESENT)
  #define MMC_RSP_R6	(MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE)
  #define MMC_RSP_R7	(MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE)
  
  #define mmc_resp_type(cmd)	((cmd)->flags & (MMC_RSP_PRESENT|MMC_RSP_136|MMC_RSP_CRC|MMC_RSP_BUSY|MMC_RSP_OPCODE))
  
  /*
   * These are the command types.
   */
  #define mmc_cmd_type(cmd)	((cmd)->flags & MMC_CMD_MASK)
  
  	unsigned int		retries;	/* max number of retries */
  	unsigned int		error;		/* command error */
  
  #define MMC_ERR_NONE	0
  #define MMC_ERR_TIMEOUT	1
  #define MMC_ERR_BADCRC	2
  #define MMC_ERR_FIFO	3
  #define MMC_ERR_FAILED	4
  #define MMC_ERR_INVALID	5
  
  	struct mmc_data		*data;		/* data segment associated with cmd */
  	struct mmc_request	*mrq;		/* associated request */
  };
  
  struct mmc_data {
  	unsigned int		timeout_ns;	/* data timeout (in ns, max 80ms) */
  	unsigned int		timeout_clks;	/* data timeout (in clocks) */
  	unsigned int		blksz;		/* data block size */
  	unsigned int		blocks;		/* number of blocks */
  	unsigned int		error;		/* data error */
  	unsigned int		flags;
  
  #define MMC_DATA_WRITE	(1 << 8)
  #define MMC_DATA_READ	(1 << 9)
  #define MMC_DATA_STREAM	(1 << 10)
  #define MMC_DATA_MULTI	(1 << 11)
  
  	unsigned int		bytes_xfered;
  
  	struct mmc_command	*stop;		/* stop command */
  	struct mmc_request	*mrq;		/* associated request */
  
  	unsigned int		sg_len;		/* size of scatter list */
  	struct scatterlist	*sg;		/* I/O scatter list */
  };
  
  struct mmc_request {
  	struct mmc_command	*cmd;
  	struct mmc_data		*data;
  	struct mmc_command	*stop;
  
  	void			*done_data;	/* completion data */
  	void			(*done)(struct mmc_request *);/* completion function */
  };
  
  struct mmc_host;
  struct mmc_card;
  
  extern int mmc_wait_for_req(struct mmc_host *, struct mmc_request *);
  extern int mmc_wait_for_cmd(struct mmc_host *, struct mmc_command *, int);
  extern int mmc_wait_for_app_cmd(struct mmc_host *, unsigned int,
  	struct mmc_command *, int);
  
  extern void mmc_set_data_timeout(struct mmc_data *, const struct mmc_card *, int);
  
  extern int __mmc_claim_host(struct mmc_host *host, struct mmc_card *card);
  
  static inline void mmc_claim_host(struct mmc_host *host)
  {
  	__mmc_claim_host(host, (struct mmc_card *)-1);
  }
  
  extern void mmc_release_host(struct mmc_host *host);
  
  #endif
  