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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * UFS Transport SGIO v4 BSG Message Support
4 *
5 * Copyright (C) 2011-2013 Samsung India Software Operations
6 * Copyright (C) 2018 Western Digital Corporation
7 */
8#ifndef SCSI_BSG_UFS_H
9#define SCSI_BSG_UFS_H
10
11#include <linux/types.h>
12/*
13 * This file intended to be included by both kernel and user space
14 */
15
16#define UFS_CDB_SIZE 16
17#define UPIU_TRANSACTION_UIC_CMD 0x1F
18/* uic commands are 4DW long, per UFSHCI V2.1 paragraph 5.6.1 */
19#define UIC_CMD_SIZE (sizeof(__u32) * 4)
20
21/**
22 * struct utp_upiu_header - UPIU header structure
23 * @dword_0: UPIU header DW-0
24 * @dword_1: UPIU header DW-1
25 * @dword_2: UPIU header DW-2
26 */
27struct utp_upiu_header {
28 __be32 dword_0;
29 __be32 dword_1;
30 __be32 dword_2;
31};
32
33/**
34 * struct utp_upiu_query - upiu request buffer structure for
35 * query request.
36 * @opcode: command to perform B-0
37 * @idn: a value that indicates the particular type of data B-1
38 * @index: Index to further identify data B-2
39 * @selector: Index to further identify data B-3
40 * @reserved_osf: spec reserved field B-4,5
41 * @length: number of descriptor bytes to read/write B-6,7
42 * @value: Attribute value to be written DW-5
43 * @reserved: spec reserved DW-6,7
44 */
45struct utp_upiu_query {
46 __u8 opcode;
47 __u8 idn;
48 __u8 index;
49 __u8 selector;
50 __be16 reserved_osf;
51 __be16 length;
52 __be32 value;
53 __be32 reserved[2];
54};
55
56/**
57 * struct utp_upiu_cmd - Command UPIU structure
58 * @data_transfer_len: Data Transfer Length DW-3
59 * @cdb: Command Descriptor Block CDB DW-4 to DW-7
60 */
61struct utp_upiu_cmd {
62 __be32 exp_data_transfer_len;
63 __u8 cdb[UFS_CDB_SIZE];
64};
65
66/**
67 * struct utp_upiu_req - general upiu request structure
68 * @header:UPIU header structure DW-0 to DW-2
69 * @sc: fields structure for scsi command DW-3 to DW-7
70 * @qr: fields structure for query request DW-3 to DW-7
71 */
72struct utp_upiu_req {
73 struct utp_upiu_header header;
74 union {
75 struct utp_upiu_cmd sc;
76 struct utp_upiu_query qr;
77 struct utp_upiu_query tr;
78 /* use utp_upiu_query to host the 4 dwords of uic command */
79 struct utp_upiu_query uc;
80 };
81};
82
83/* request (CDB) structure of the sg_io_v4 */
84struct ufs_bsg_request {
85 __u32 msgcode;
86 struct utp_upiu_req upiu_req;
87};
88
89/* response (request sense data) structure of the sg_io_v4 */
90struct ufs_bsg_reply {
91 /*
92 * The completion result. Result exists in two forms:
93 * if negative, it is an -Exxx system errno value. There will
94 * be no further reply information supplied.
95 * else, it's the 4-byte scsi error result, with driver, host,
96 * msg and status fields. The per-msgcode reply structure
97 * will contain valid data.
98 */
99 __u32 result;
100
101 /* If there was reply_payload, how much was received? */
102 __u32 reply_payload_rcv_len;
103
104 struct utp_upiu_req upiu_rsp;
105};
106#endif /* UFS_BSG_H */