LXR linux/include/uapi/linux/mmc/ioctl.h

   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
   8struct 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 */
  59struct mmc_ioc_multi_cmd {
  60        __u64 num_of_cmds;
  61        struct mmc_ioc_cmd cmds[0];
  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