107 lines
2.7 KiB
C
107 lines
2.7 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* UFS Transport SGIO v4 BSG Message Support
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*
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* Copyright (C) 2011-2013 Samsung India Software Operations
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* Copyright (C) 2018 Western Digital Corporation
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*/
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#ifndef SCSI_BSG_UFS_H
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#define SCSI_BSG_UFS_H
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#include <linux/types.h>
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/*
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* This file intended to be included by both kernel and user space
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*/
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#define UFS_CDB_SIZE 16
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#define UPIU_TRANSACTION_UIC_CMD 0x1F
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/* uic commands are 4DW long, per UFSHCI V2.1 paragraph 5.6.1 */
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#define UIC_CMD_SIZE (sizeof(__u32) * 4)
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/**
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* struct utp_upiu_header - UPIU header structure
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* @dword_0: UPIU header DW-0
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* @dword_1: UPIU header DW-1
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* @dword_2: UPIU header DW-2
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*/
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struct utp_upiu_header {
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__be32 dword_0;
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__be32 dword_1;
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__be32 dword_2;
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};
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/**
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* struct utp_upiu_query - upiu request buffer structure for
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* query request.
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* @opcode: command to perform B-0
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* @idn: a value that indicates the particular type of data B-1
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* @index: Index to further identify data B-2
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* @selector: Index to further identify data B-3
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* @reserved_osf: spec reserved field B-4,5
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* @length: number of descriptor bytes to read/write B-6,7
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* @value: Attribute value to be written DW-5
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* @reserved: spec reserved DW-6,7
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*/
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struct utp_upiu_query {
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__u8 opcode;
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__u8 idn;
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__u8 index;
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__u8 selector;
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__be16 reserved_osf;
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__be16 length;
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__be32 value;
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__be32 reserved[2];
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};
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/**
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* struct utp_upiu_cmd - Command UPIU structure
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* @data_transfer_len: Data Transfer Length DW-3
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* @cdb: Command Descriptor Block CDB DW-4 to DW-7
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*/
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struct utp_upiu_cmd {
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__be32 exp_data_transfer_len;
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__u8 cdb[UFS_CDB_SIZE];
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};
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/**
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* struct utp_upiu_req - general upiu request structure
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* @header:UPIU header structure DW-0 to DW-2
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* @sc: fields structure for scsi command DW-3 to DW-7
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* @qr: fields structure for query request DW-3 to DW-7
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*/
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struct utp_upiu_req {
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struct utp_upiu_header header;
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union {
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struct utp_upiu_cmd sc;
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struct utp_upiu_query qr;
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struct utp_upiu_query tr;
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/* use utp_upiu_query to host the 4 dwords of uic command */
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struct utp_upiu_query uc;
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};
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};
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/* request (CDB) structure of the sg_io_v4 */
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struct ufs_bsg_request {
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__u32 msgcode;
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struct utp_upiu_req upiu_req;
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};
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/* response (request sense data) structure of the sg_io_v4 */
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struct ufs_bsg_reply {
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/*
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* The completion result. Result exists in two forms:
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* if negative, it is an -Exxx system errno value. There will
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* be no further reply information supplied.
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* else, it's the 4-byte scsi error result, with driver, host,
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* msg and status fields. The per-msgcode reply structure
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* will contain valid data.
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*/
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__u32 result;
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/* If there was reply_payload, how much was received? */
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__u32 reply_payload_rcv_len;
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struct utp_upiu_req upiu_rsp;
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};
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#endif /* UFS_BSG_H */
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