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