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