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 8 struct mmc_ioc_cmd { 9 /* Implies direction of data. true = write, false = read */ 10 int write_flag; 11 12 /* Application-specific command. true = precede with CMD55 */ 13 int is_acmd; 14 15 __u32 opcode; 16 __u32 arg; 17 __u32 response[4]; /* CMD response */ 18 unsigned int flags; 19 unsigned int blksz; 20 unsigned int blocks; 21 22 /* 23 * Sleep at least postsleep_min_us useconds, and at most 24 * postsleep_max_us useconds *after* issuing command. Needed for 25 * some read commands for which cards have no other way of indicating 26 * they're ready for the next command (i.e. there is no equivalent of 27 * a "busy" indicator for read operations). 28 */ 29 unsigned int postsleep_min_us; 30 unsigned int postsleep_max_us; 31 32 /* 33 * Override driver-computed timeouts. Note the difference in units! 34 */ 35 unsigned int data_timeout_ns; 36 unsigned int cmd_timeout_ms; 37 38 /* 39 * For 64-bit machines, the next member, ``__u64 data_ptr``, wants to 40 * be 8-byte aligned. Make sure this struct is the same size when 41 * built for 32-bit. 42 */ 43 __u32 __pad; 44 45 /* DAT buffer */ 46 __u64 data_ptr; 47 }; 48 #define mmc_ioc_cmd_set_data(ic, ptr) ic.data_ptr = (__u64)(unsigned long) ptr 49 50 /** 51 * struct mmc_ioc_multi_cmd - multi command information 52 * @num_of_cmds: Number of commands to send. Must be equal to or less than 53 * MMC_IOC_MAX_CMDS. 54 * @cmds: Array of commands with length equal to 'num_of_cmds' 55 */ 56 struct mmc_ioc_multi_cmd { 57 __u64 num_of_cmds; 58 struct mmc_ioc_cmd cmds[0]; 59 }; 60 61 #define MMC_IOC_CMD _IOWR(MMC_BLOCK_MAJOR, 0, struct mmc_ioc_cmd) 62 /* 63 * MMC_IOC_MULTI_CMD: Used to send an array of MMC commands described by 64 * the structure mmc_ioc_multi_cmd. The MMC driver will issue all 65 * commands in array in sequence to card. 66 */ 67 #define MMC_IOC_MULTI_CMD _IOWR(MMC_BLOCK_MAJOR, 1, struct mmc_ioc_multi_cmd) 68 /* 69 * Since this ioctl is only meant to enhance (and not replace) normal access 70 * to the mmc bus device, an upper data transfer limit of MMC_IOC_MAX_BYTES 71 * is enforced per ioctl call. For larger data transfers, use the normal 72 * block device operations. 73 */ 74 #define MMC_IOC_MAX_BYTES (512L * 1024) 75 #define MMC_IOC_MAX_CMDS 255 76 #endif /* LINUX_MMC_IOCTL_H */ 77