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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  */
27 struct 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  */
45 struct 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  */
61 struct 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  */
72 struct 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 */
84 struct 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 */
90 struct 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 */
107