2 * linux/include/linux/mmc/core.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 #ifndef LINUX_MMC_CORE_H
9 #define LINUX_MMC_CORE_H
11 #include <linux/interrupt.h>
12 #include <linux/device.h>
22 unsigned int flags; /* expected response type */
23 #define MMC_RSP_PRESENT (1 << 0)
24 #define MMC_RSP_136 (1 << 1) /* 136 bit response */
25 #define MMC_RSP_CRC (1 << 2) /* expect valid crc */
26 #define MMC_RSP_BUSY (1 << 3) /* card may send busy */
27 #define MMC_RSP_OPCODE (1 << 4) /* response contains opcode */
28 #define MMC_CMD_MASK (3 << 5) /* command type */
29 #define MMC_CMD_AC (0 << 5)
30 #define MMC_CMD_ADTC (1 << 5)
31 #define MMC_CMD_BC (2 << 5)
32 #define MMC_CMD_BCR (3 << 5)
35 * These are the response types, and correspond to valid bit
36 * patterns of the above flags. One additional valid pattern
37 * is all zeros, which means we don't expect a response.
39 #define MMC_RSP_NONE (0)
40 #define MMC_RSP_R1 (MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE)
41 #define MMC_RSP_R1B (MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE|MMC_RSP_BUSY)
42 #define MMC_RSP_R2 (MMC_RSP_PRESENT|MMC_RSP_136|MMC_RSP_CRC)
43 #define MMC_RSP_R3 (MMC_RSP_PRESENT)
44 #define MMC_RSP_R4 (MMC_RSP_PRESENT)
45 #define MMC_RSP_R5 (MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE)
46 #define MMC_RSP_R6 (MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE)
47 #define MMC_RSP_R7 (MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE)
49 #define mmc_resp_type(cmd) ((cmd)->flags & (MMC_RSP_PRESENT|MMC_RSP_136|MMC_RSP_CRC|MMC_RSP_BUSY|MMC_RSP_OPCODE))
52 * These are the command types.
54 #define mmc_cmd_type(cmd) ((cmd)->flags & MMC_CMD_MASK)
56 unsigned int retries; /* max number of retries */
57 unsigned int error; /* command error */
60 * Standard errno values are used for errors, but some have specific
61 * meaning in the MMC layer:
63 * ETIMEDOUT Card took too long to respond
64 * EILSEQ Basic format problem with the received or sent data
65 * (e.g. CRC check failed, incorrect opcode in response
67 * EINVAL Request cannot be performed because of restrictions
68 * in hardware and/or the driver
69 * ENOMEDIUM Host can determine that the slot is empty and is
70 * actively failing requests
73 struct mmc_data *data; /* data segment associated with cmd */
74 struct mmc_request *mrq; /* associated request */
78 unsigned int timeout_ns; /* data timeout (in ns, max 80ms) */
79 unsigned int timeout_clks; /* data timeout (in clocks) */
80 unsigned int blksz; /* data block size */
81 unsigned int blocks; /* number of blocks */
82 unsigned int error; /* data error */
85 #define MMC_DATA_WRITE (1 << 8)
86 #define MMC_DATA_READ (1 << 9)
87 #define MMC_DATA_STREAM (1 << 10)
89 unsigned int bytes_xfered;
91 struct mmc_command *stop; /* stop command */
92 struct mmc_request *mrq; /* associated request */
94 unsigned int sg_len; /* size of scatter list */
95 struct scatterlist *sg; /* I/O scatter list */
99 struct mmc_command *cmd;
100 struct mmc_data *data;
101 struct mmc_command *stop;
103 void *done_data; /* completion data */
104 void (*done)(struct mmc_request *);/* completion function */
110 extern void mmc_wait_for_req(struct mmc_host *, struct mmc_request *);
111 extern int mmc_wait_for_cmd(struct mmc_host *, struct mmc_command *, int);
112 extern int mmc_wait_for_app_cmd(struct mmc_host *, struct mmc_card *,
113 struct mmc_command *, int);
115 extern void mmc_set_data_timeout(struct mmc_data *, const struct mmc_card *);
117 extern int __mmc_claim_host(struct mmc_host *host, atomic_t *abort);
118 extern void mmc_release_host(struct mmc_host *host);
121 * mmc_claim_host - exclusively claim a host
122 * @host: mmc host to claim
124 * Claim a host for a set of operations.
126 static inline void mmc_claim_host(struct mmc_host *host)
128 __mmc_claim_host(host, NULL);