include/linux/mmc/ioctl.h

   1 #ifndef LINUX_MMC_IOCTL_H
   2 #define LINUX_MMC_IOCTL_H
   3 struct mmc_ioc_cmd {
   4         /* Implies direction of data.  true = write, false = read */
   5         int write_flag;
   6
   7         /* Application-specific command.  true = precede with CMD55 */
   8         int is_acmd;
   9
  10         __u32 opcode;
  11         __u32 arg;
  12         __u32 response[4];  /* CMD response */
  13         unsigned int flags;
  14         unsigned int blksz;
  15         unsigned int blocks;
  16
  17         /*
  18          * Sleep at least postsleep_min_us useconds, and at most
  19          * postsleep_max_us useconds *after* issuing command.  Needed for
  20          * some read commands for which cards have no other way of indicating
  21          * they're ready for the next command (i.e. there is no equivalent of
  22          * a "busy" indicator for read operations).
  23          */
  24         unsigned int postsleep_min_us;
  25         unsigned int postsleep_max_us;
  26
  27         /*
  28          * Override driver-computed timeouts.  Note the difference in units!
  29          */
  30         unsigned int data_timeout_ns;
  31         unsigned int cmd_timeout_ms;
  32
  33         /*
  34          * For 64-bit machines, the next member, ``__u64 data_ptr``, wants to
  35          * be 8-byte aligned.  Make sure this struct is the same size when
  36          * built for 32-bit.
  37          */
  38         __u32 __pad;
  39
  40         /* DAT buffer */
  41         __u64 data_ptr;
  42 };
  43 #define mmc_ioc_cmd_set_data(ic, ptr) ic.data_ptr = (__u64)(unsigned long) ptr
  44
  45 #define MMC_IOC_CMD _IOWR(MMC_BLOCK_MAJOR, 0, struct mmc_ioc_cmd)
  46
  47 /*
  48  * Since this ioctl is only meant to enhance (and not replace) normal access
  49  * to the mmc bus device, an upper data transfer limit of MMC_IOC_MAX_BYTES
  50  * is enforced per ioctl call.  For larger data transfers, use the normal
  51  * block device operations.
  52  */
  53 #define MMC_IOC_MAX_BYTES  (512L * 256)
  54 #endif /* LINUX_MMC_IOCTL_H */