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 */ 76