tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * linux/include/linux/mmc/mmc.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 MMC_H
9#define MMC_H
10
11#include <linux/list.h>
12#include <linux/interrupt.h>
13#include <linux/device.h>
14
15struct request;
16struct mmc_data;
17struct mmc_request;
18
19struct mmc_command {
20 u32 opcode;
21 u32 arg;
22 u32 resp[4];
23 unsigned int flags; /* expected response type */
24#define MMC_RSP_NONE (0 << 0)
25#define MMC_RSP_SHORT (1 << 0)
26#define MMC_RSP_LONG (2 << 0)
27#define MMC_RSP_MASK (3 << 0)
28#define MMC_RSP_CRC (1 << 3) /* expect valid crc */
29#define MMC_RSP_BUSY (1 << 4) /* card may send busy */
30
31/*
32 * These are the response types, and correspond to valid bit
33 * patterns of the above flags. One additional valid pattern
34 * is all zeros, which means we don't expect a response.
35 */
36#define MMC_RSP_R1 (MMC_RSP_SHORT|MMC_RSP_CRC)
37#define MMC_RSP_R1B (MMC_RSP_SHORT|MMC_RSP_CRC|MMC_RSP_BUSY)
38#define MMC_RSP_R2 (MMC_RSP_LONG|MMC_RSP_CRC)
39#define MMC_RSP_R3 (MMC_RSP_SHORT)
40#define MMC_RSP_R6 (MMC_RSP_SHORT|MMC_RSP_CRC)
41
42 unsigned int retries; /* max number of retries */
43 unsigned int error; /* command error */
44
45#define MMC_ERR_NONE 0
46#define MMC_ERR_TIMEOUT 1
47#define MMC_ERR_BADCRC 2
48#define MMC_ERR_FIFO 3
49#define MMC_ERR_FAILED 4
50#define MMC_ERR_INVALID 5
51
52 struct mmc_data *data; /* data segment associated with cmd */
53 struct mmc_request *mrq; /* assoicated request */
54};
55
56struct mmc_data {
57 unsigned int timeout_ns; /* data timeout (in ns, max 80ms) */
58 unsigned int timeout_clks; /* data timeout (in clocks) */
59 unsigned int blksz_bits; /* data block size */
60 unsigned int blocks; /* number of blocks */
61 unsigned int error; /* data error */
62 unsigned int flags;
63
64#define MMC_DATA_WRITE (1 << 8)
65#define MMC_DATA_READ (1 << 9)
66#define MMC_DATA_STREAM (1 << 10)
67
68 unsigned int bytes_xfered;
69
70 struct mmc_command *stop; /* stop command */
71 struct mmc_request *mrq; /* assoicated request */
72
73 unsigned int sg_len; /* size of scatter list */
74 struct scatterlist *sg; /* I/O scatter list */
75};
76
77struct mmc_request {
78 struct mmc_command *cmd;
79 struct mmc_data *data;
80 struct mmc_command *stop;
81
82 void *done_data; /* completion data */
83 void (*done)(struct mmc_request *);/* completion function */
84};
85
86struct mmc_host;
87struct mmc_card;
88
89extern int mmc_wait_for_req(struct mmc_host *, struct mmc_request *);
90extern int mmc_wait_for_cmd(struct mmc_host *, struct mmc_command *, int);
91
92extern int __mmc_claim_host(struct mmc_host *host, struct mmc_card *card);
93
94static inline void mmc_claim_host(struct mmc_host *host)
95{
96 __mmc_claim_host(host, (struct mmc_card *)-1);
97}
98
99extern void mmc_release_host(struct mmc_host *host);
100
101#endif