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/*
* linux/include/linux/mmc/core.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 LINUX_MMC_CORE_H
#define LINUX_MMC_CORE_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_R4 (MMC_RSP_PRESENT)
#define MMC_RSP_R5 (MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE)
#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 */
/*
* Standard errno values are used for errors, but some have specific
* meaning in the MMC layer:
*
* ETIMEDOUT Card took too long to respond
* EILSEQ Basic format problem with the received or sent data
* (e.g. CRC check failed, incorrect opcode in response
* or bad end bit)
* EINVAL Request cannot be performed because of restrictions
* in hardware and/or the driver
* ENOMEDIUM Host can determine that the slot is empty and is
* actively failing requests
*/
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)
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 void 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 *, struct mmc_card *,
struct mmc_command *, int);
extern void mmc_set_data_timeout(struct mmc_data *, const struct mmc_card *);
extern int __mmc_claim_host(struct mmc_host *host, atomic_t *abort);
extern void mmc_release_host(struct mmc_host *host);
/**
* mmc_claim_host - exclusively claim a host
* @host: mmc host to claim
*
* Claim a host for a set of operations.
*/
static inline void mmc_claim_host(struct mmc_host *host)
{
__mmc_claim_host(host, NULL);
}
#endif
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