Linux kernel mirror (for testing)
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linux
1/*
2 * linux/include/linux/mmc/core.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#ifndef LINUX_MMC_CORE_H
9#define LINUX_MMC_CORE_H
10
11#include <linux/completion.h>
12#include <linux/types.h>
13
14struct mmc_data;
15struct mmc_request;
16
17enum mmc_blk_status {
18 MMC_BLK_SUCCESS = 0,
19 MMC_BLK_PARTIAL,
20 MMC_BLK_CMD_ERR,
21 MMC_BLK_RETRY,
22 MMC_BLK_ABORT,
23 MMC_BLK_DATA_ERR,
24 MMC_BLK_ECC_ERR,
25 MMC_BLK_NOMEDIUM,
26 MMC_BLK_NEW_REQUEST,
27};
28
29struct mmc_command {
30 u32 opcode;
31 u32 arg;
32#define MMC_CMD23_ARG_REL_WR (1 << 31)
33#define MMC_CMD23_ARG_PACKED ((0 << 31) | (1 << 30))
34#define MMC_CMD23_ARG_TAG_REQ (1 << 29)
35 u32 resp[4];
36 unsigned int flags; /* expected response type */
37#define MMC_RSP_PRESENT (1 << 0)
38#define MMC_RSP_136 (1 << 1) /* 136 bit response */
39#define MMC_RSP_CRC (1 << 2) /* expect valid crc */
40#define MMC_RSP_BUSY (1 << 3) /* card may send busy */
41#define MMC_RSP_OPCODE (1 << 4) /* response contains opcode */
42
43#define MMC_CMD_MASK (3 << 5) /* non-SPI command type */
44#define MMC_CMD_AC (0 << 5)
45#define MMC_CMD_ADTC (1 << 5)
46#define MMC_CMD_BC (2 << 5)
47#define MMC_CMD_BCR (3 << 5)
48
49#define MMC_RSP_SPI_S1 (1 << 7) /* one status byte */
50#define MMC_RSP_SPI_S2 (1 << 8) /* second byte */
51#define MMC_RSP_SPI_B4 (1 << 9) /* four data bytes */
52#define MMC_RSP_SPI_BUSY (1 << 10) /* card may send busy */
53
54/*
55 * These are the native response types, and correspond to valid bit
56 * patterns of the above flags. One additional valid pattern
57 * is all zeros, which means we don't expect a response.
58 */
59#define MMC_RSP_NONE (0)
60#define MMC_RSP_R1 (MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE)
61#define MMC_RSP_R1B (MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE|MMC_RSP_BUSY)
62#define MMC_RSP_R2 (MMC_RSP_PRESENT|MMC_RSP_136|MMC_RSP_CRC)
63#define MMC_RSP_R3 (MMC_RSP_PRESENT)
64#define MMC_RSP_R4 (MMC_RSP_PRESENT)
65#define MMC_RSP_R5 (MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE)
66#define MMC_RSP_R6 (MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE)
67#define MMC_RSP_R7 (MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE)
68
69/* Can be used by core to poll after switch to MMC HS mode */
70#define MMC_RSP_R1_NO_CRC (MMC_RSP_PRESENT|MMC_RSP_OPCODE)
71
72#define mmc_resp_type(cmd) ((cmd)->flags & (MMC_RSP_PRESENT|MMC_RSP_136|MMC_RSP_CRC|MMC_RSP_BUSY|MMC_RSP_OPCODE))
73
74/*
75 * These are the SPI response types for MMC, SD, and SDIO cards.
76 * Commands return R1, with maybe more info. Zero is an error type;
77 * callers must always provide the appropriate MMC_RSP_SPI_Rx flags.
78 */
79#define MMC_RSP_SPI_R1 (MMC_RSP_SPI_S1)
80#define MMC_RSP_SPI_R1B (MMC_RSP_SPI_S1|MMC_RSP_SPI_BUSY)
81#define MMC_RSP_SPI_R2 (MMC_RSP_SPI_S1|MMC_RSP_SPI_S2)
82#define MMC_RSP_SPI_R3 (MMC_RSP_SPI_S1|MMC_RSP_SPI_B4)
83#define MMC_RSP_SPI_R4 (MMC_RSP_SPI_S1|MMC_RSP_SPI_B4)
84#define MMC_RSP_SPI_R5 (MMC_RSP_SPI_S1|MMC_RSP_SPI_S2)
85#define MMC_RSP_SPI_R7 (MMC_RSP_SPI_S1|MMC_RSP_SPI_B4)
86
87#define mmc_spi_resp_type(cmd) ((cmd)->flags & \
88 (MMC_RSP_SPI_S1|MMC_RSP_SPI_BUSY|MMC_RSP_SPI_S2|MMC_RSP_SPI_B4))
89
90/*
91 * These are the command types.
92 */
93#define mmc_cmd_type(cmd) ((cmd)->flags & MMC_CMD_MASK)
94
95 unsigned int retries; /* max number of retries */
96 int error; /* command error */
97
98/*
99 * Standard errno values are used for errors, but some have specific
100 * meaning in the MMC layer:
101 *
102 * ETIMEDOUT Card took too long to respond
103 * EILSEQ Basic format problem with the received or sent data
104 * (e.g. CRC check failed, incorrect opcode in response
105 * or bad end bit)
106 * EINVAL Request cannot be performed because of restrictions
107 * in hardware and/or the driver
108 * ENOMEDIUM Host can determine that the slot is empty and is
109 * actively failing requests
110 */
111
112 unsigned int busy_timeout; /* busy detect timeout in ms */
113 /* Set this flag only for blocking sanitize request */
114 bool sanitize_busy;
115
116 struct mmc_data *data; /* data segment associated with cmd */
117 struct mmc_request *mrq; /* associated request */
118};
119
120struct mmc_data {
121 unsigned int timeout_ns; /* data timeout (in ns, max 80ms) */
122 unsigned int timeout_clks; /* data timeout (in clocks) */
123 unsigned int blksz; /* data block size */
124 unsigned int blocks; /* number of blocks */
125 int error; /* data error */
126 unsigned int flags;
127
128#define MMC_DATA_WRITE (1 << 8)
129#define MMC_DATA_READ (1 << 9)
130
131 unsigned int bytes_xfered;
132
133 struct mmc_command *stop; /* stop command */
134 struct mmc_request *mrq; /* associated request */
135
136 unsigned int sg_len; /* size of scatter list */
137 int sg_count; /* mapped sg entries */
138 struct scatterlist *sg; /* I/O scatter list */
139 s32 host_cookie; /* host private data */
140};
141
142struct mmc_host;
143struct mmc_request {
144 struct mmc_command *sbc; /* SET_BLOCK_COUNT for multiblock */
145 struct mmc_command *cmd;
146 struct mmc_data *data;
147 struct mmc_command *stop;
148
149 struct completion completion;
150 struct completion cmd_completion;
151 void (*done)(struct mmc_request *);/* completion function */
152 struct mmc_host *host;
153
154 /* Allow other commands during this ongoing data transfer or busy wait */
155 bool cap_cmd_during_tfr;
156};
157
158struct mmc_card;
159struct mmc_async_req;
160
161struct mmc_async_req *mmc_start_areq(struct mmc_host *host,
162 struct mmc_async_req *areq,
163 enum mmc_blk_status *ret_stat);
164void mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq);
165int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd,
166 int retries);
167
168int mmc_hw_reset(struct mmc_host *host);
169void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card);
170
171#endif /* LINUX_MMC_CORE_H */