xref: /openbmc/linux/include/uapi/linux/mmc/ioctl.h (revision 94dfc73e)
1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2 #ifndef LINUX_MMC_IOCTL_H
3 #define LINUX_MMC_IOCTL_H
4 
5 #include <linux/types.h>
6 #include <linux/major.h>
7 
8 struct mmc_ioc_cmd {
9 	/*
10 	 * Direction of data: nonzero = write, zero = read.
11 	 * Bit 31 selects 'Reliable Write' for RPMB.
12 	 */
13 	int write_flag;
14 
15 	/* Application-specific command.  true = precede with CMD55 */
16 	int is_acmd;
17 
18 	__u32 opcode;
19 	__u32 arg;
20 	__u32 response[4];  /* CMD response */
21 	unsigned int flags;
22 	unsigned int blksz;
23 	unsigned int blocks;
24 
25 	/*
26 	 * Sleep at least postsleep_min_us useconds, and at most
27 	 * postsleep_max_us useconds *after* issuing command.  Needed for
28 	 * some read commands for which cards have no other way of indicating
29 	 * they're ready for the next command (i.e. there is no equivalent of
30 	 * a "busy" indicator for read operations).
31 	 */
32 	unsigned int postsleep_min_us;
33 	unsigned int postsleep_max_us;
34 
35 	/*
36 	 * Override driver-computed timeouts.  Note the difference in units!
37 	 */
38 	unsigned int data_timeout_ns;
39 	unsigned int cmd_timeout_ms;
40 
41 	/*
42 	 * For 64-bit machines, the next member, ``__u64 data_ptr``, wants to
43 	 * be 8-byte aligned.  Make sure this struct is the same size when
44 	 * built for 32-bit.
45 	 */
46 	__u32 __pad;
47 
48 	/* DAT buffer */
49 	__u64 data_ptr;
50 };
51 #define mmc_ioc_cmd_set_data(ic, ptr) ic.data_ptr = (__u64)(unsigned long) ptr
52 
53 /**
54  * struct mmc_ioc_multi_cmd - multi command information
55  * @num_of_cmds: Number of commands to send. Must be equal to or less than
56  *	MMC_IOC_MAX_CMDS.
57  * @cmds: Array of commands with length equal to 'num_of_cmds'
58  */
59 struct mmc_ioc_multi_cmd {
60 	__u64 num_of_cmds;
61 	struct mmc_ioc_cmd cmds[];
62 };
63 
64 #define MMC_IOC_CMD _IOWR(MMC_BLOCK_MAJOR, 0, struct mmc_ioc_cmd)
65 /*
66  * MMC_IOC_MULTI_CMD: Used to send an array of MMC commands described by
67  *	the structure mmc_ioc_multi_cmd. The MMC driver will issue all
68  *	commands in array in sequence to card.
69  */
70 #define MMC_IOC_MULTI_CMD _IOWR(MMC_BLOCK_MAJOR, 1, struct mmc_ioc_multi_cmd)
71 /*
72  * Since this ioctl is only meant to enhance (and not replace) normal access
73  * to the mmc bus device, an upper data transfer limit of MMC_IOC_MAX_BYTES
74  * is enforced per ioctl call.  For larger data transfers, use the normal
75  * block device operations.
76  */
77 #define MMC_IOC_MAX_BYTES  (512L * 1024)
78 #define MMC_IOC_MAX_CMDS    255
79 #endif /* LINUX_MMC_IOCTL_H */
80