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/interrupt.h>
12 #include <linux/device.h>
13
14 struct request;
15 struct mmc_data;
16 struct mmc_request;
17
18 struct mmc_command {
19 u32 opcode;
20 u32 arg;
21 u32 resp[4];
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
29 #define MMC_CMD_MASK (3 << 5) /* non-SPI command type */
30 #define MMC_CMD_AC (0 << 5)
31 #define MMC_CMD_ADTC (1 << 5)
32 #define MMC_CMD_BC (2 << 5)
33 #define MMC_CMD_BCR (3 << 5)
34
35 #define MMC_RSP_SPI_S1 (1 << 7) /* one status byte */
36 #define MMC_RSP_SPI_S2 (1 << 8) /* second byte */
37 #define MMC_RSP_SPI_B4 (1 << 9) /* four data bytes */
38 #define MMC_RSP_SPI_BUSY (1 << 10) /* card may send busy */
39
40 /*
41 * These are the native response types, and correspond to valid bit
42 * patterns of the above flags. One additional valid pattern
43 * is all zeros, which means we don't expect a response.
44 */
45 #define MMC_RSP_NONE (0)
46 #define MMC_RSP_R1 (MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE)
47 #define MMC_RSP_R1B (MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE|MMC_RSP_BUSY)
48 #define MMC_RSP_R2 (MMC_RSP_PRESENT|MMC_RSP_136|MMC_RSP_CRC)
49 #define MMC_RSP_R3 (MMC_RSP_PRESENT)
50 #define MMC_RSP_R4 (MMC_RSP_PRESENT)
51 #define MMC_RSP_R5 (MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE)
52 #define MMC_RSP_R6 (MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE)
53 #define MMC_RSP_R7 (MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE)
54
55 #define mmc_resp_type(cmd) ((cmd)->flags & (MMC_RSP_PRESENT|MMC_RSP_136|MMC_RSP_CRC|MMC_RSP_BUSY|MMC_RSP_OPCODE))
56
57 /*
58 * These are the SPI response types for MMC, SD, and SDIO cards.
59 * Commands return R1, with maybe more info. Zero is an error type;
60 * callers must always provide the appropriate MMC_RSP_SPI_Rx flags.
61 */
62 #define MMC_RSP_SPI_R1 (MMC_RSP_SPI_S1)
63 #define MMC_RSP_SPI_R1B (MMC_RSP_SPI_S1|MMC_RSP_SPI_BUSY)
64 #define MMC_RSP_SPI_R2 (MMC_RSP_SPI_S1|MMC_RSP_SPI_S2)
65 #define MMC_RSP_SPI_R3 (MMC_RSP_SPI_S1|MMC_RSP_SPI_B4)
66 #define MMC_RSP_SPI_R4 (MMC_RSP_SPI_S1|MMC_RSP_SPI_B4)
67 #define MMC_RSP_SPI_R5 (MMC_RSP_SPI_S1|MMC_RSP_SPI_S2)
68 #define MMC_RSP_SPI_R7 (MMC_RSP_SPI_S1|MMC_RSP_SPI_B4)
69
70 #define mmc_spi_resp_type(cmd) ((cmd)->flags & \
71 (MMC_RSP_SPI_S1|MMC_RSP_SPI_BUSY|MMC_RSP_SPI_S2|MMC_RSP_SPI_B4))
72
73 /*
74 * These are the command types.
75 */
76 #define mmc_cmd_type(cmd) ((cmd)->flags & MMC_CMD_MASK)
77
78 unsigned int retries; /* max number of retries */
79 unsigned int error; /* command error */
80
81 /*
82 * Standard errno values are used for errors, but some have specific
83 * meaning in the MMC layer:
84 *
85 * ETIMEDOUT Card took too long to respond
86 * EILSEQ Basic format problem with the received or sent data
87 * (e.g. CRC check failed, incorrect opcode in response
88 * or bad end bit)
89 * EINVAL Request cannot be performed because of restrictions
90 * in hardware and/or the driver
91 * ENOMEDIUM Host can determine that the slot is empty and is
92 * actively failing requests
93 */
94
95 struct mmc_data *data; /* data segment associated with cmd */
96 struct mmc_request *mrq; /* associated request */
97 };
98
99 struct mmc_data {
100 unsigned int timeout_ns; /* data timeout (in ns, max 80ms) */
101 unsigned int timeout_clks; /* data timeout (in clocks) */
102 unsigned int blksz; /* data block size */
103 unsigned int blocks; /* number of blocks */
104 unsigned int error; /* data error */
105 unsigned int flags;
106
107 #define MMC_DATA_WRITE (1 << 8)
108 #define MMC_DATA_READ (1 << 9)
109 #define MMC_DATA_STREAM (1 << 10)
110
111 unsigned int bytes_xfered;
112
113 struct mmc_command *stop; /* stop command */
114 struct mmc_request *mrq; /* associated request */
115
116 unsigned int sg_len; /* size of scatter list */
117 struct scatterlist *sg; /* I/O scatter list */
118 };
119
120 struct mmc_request {
121 struct mmc_command *cmd;
122 struct mmc_data *data;
123 struct mmc_command *stop;
124
125 void *done_data; /* completion data */
126 void (*done)(struct mmc_request *);/* completion function */
127 };
128
129 struct mmc_host;
130 struct mmc_card;
131
132 extern void mmc_wait_for_req(struct mmc_host *, struct mmc_request *);
133 extern int mmc_wait_for_cmd(struct mmc_host *, struct mmc_command *, int);
134 extern int mmc_wait_for_app_cmd(struct mmc_host *, struct mmc_card *,
135 struct mmc_command *, int);
136
137 extern void mmc_set_data_timeout(struct mmc_data *, const struct mmc_card *);
138
139 extern int __mmc_claim_host(struct mmc_host *host, atomic_t *abort);
140 extern void mmc_release_host(struct mmc_host *host);
141
142 /**
143 * mmc_claim_host - exclusively claim a host
144 * @host: mmc host to claim
145 *
146 * Claim a host for a set of operations.
147 */
148 static inline void mmc_claim_host(struct mmc_host *host)
149 {
150 __mmc_claim_host(host, NULL);
151 }
152
153 #endif
154
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