include/linux/mmc/ioctl.h

   1 #ifndef LINUX_MMC_IOCTL_H
   2 #define LINUX_MMC_IOCTL_H
   3
   4 #include <linux/types.h>
   5
   6 struct mmc_ioc_cmd {
   7         /* Implies direction of data.  true = write, false = read */
   8         int write_flag;
   9
  10         /* Application-specific command.  true = precede with CMD55 */
  11         int is_acmd;
  12
  13         __u32 opcode;
  14         __u32 arg;
  15         __u32 response[4];  /* CMD response */
  16         unsigned int flags;
  17         unsigned int blksz;
  18         unsigned int blocks;
  19
  20         /*
  21          * Sleep at least postsleep_min_us useconds, and at most
  22          * postsleep_max_us useconds *after* issuing command.  Needed for
  23          * some read commands for which cards have no other way of indicating
  24          * they're ready for the next command (i.e. there is no equivalent of
  25          * a "busy" indicator for read operations).
  26          */
  27         unsigned int postsleep_min_us;
  28         unsigned int postsleep_max_us;
  29
  30         /*
  31          * Override driver-computed timeouts.  Note the difference in units!
  32          */
  33         unsigned int data_timeout_ns;
  34         unsigned int cmd_timeout_ms;
  35
  36         /*
  37          * For 64-bit machines, the next member, ``__u64 data_ptr``, wants to
  38          * be 8-byte aligned.  Make sure this struct is the same size when
  39          * built for 32-bit.
  40          */
  41         __u32 __pad;
  42
  43         /* DAT buffer */
  44         __u64 data_ptr;
  45 };
  46 #define mmc_ioc_cmd_set_data(ic, ptr) ic.data_ptr = (__u64)(unsigned long) ptr
  47
  48 #define MMC_IOC_CMD _IOWR(MMC_BLOCK_MAJOR, 0, struct mmc_ioc_cmd)
  49
  50 /*
  51  * Since this ioctl is only meant to enhance (and not replace) normal access
  52  * to the mmc bus device, an upper data transfer limit of MMC_IOC_MAX_BYTES
  53  * is enforced per ioctl call.  For larger data transfers, use the normal
  54  * block device operations.
  55  */
  56 #define MMC_IOC_MAX_BYTES  (512L * 256)
  57 #endif /* LINUX_MMC_IOCTL_H */