include/scsi.h - filogic/uboot - Gitiles

 /* SPDX-License-Identifier: GPL-2.0+ */
 /*
  * (C) Copyright 2001
  * Denis Peter, MPL AG Switzerland
  */
  #ifndef _SCSI_H
  #define _SCSI_H

 #include <asm/cache.h>
 #include <bouncebuf.h>
 #include <linux/dma-direction.h>

 struct udevice;

 /**
  * struct scsi_cmd - information about a SCSI command to be processed
  *
  * @cmd: command
  * @sense_buf: for request sense
  * @status: SCSI Status
  * @target: Target ID
  * @lun: Target LUN
  * @cmdlen: command len
  * @datalen: Total data length
  * @pdata: pointer to data
  * @msgout: Messge out buffer (NOT USED)
  * @msgin: Message in buffer
  * @sensecmdlen: Sense command len
  * @sensedatalen: Sense data len
  * @sensecmd: Sense command
  * @contr_stat: Controller Status
  * @trans_bytes: tranfered bytes
  * @priv: Private value
  * @dma_dir: Direction of data structure
  */
 struct scsi_cmd {
 	unsigned char cmd[16];
 	unsigned char sense_buf[64]
 		__attribute__((aligned(ARCH_DMA_MINALIGN)));
 	unsigned char status;
 	unsigned char target;
 	unsigned char lun;
 	unsigned char cmdlen;
 	unsigned long datalen;
 	unsigned char *pdata;
 	unsigned char msgout[12];
 	unsigned char msgin[12];
 	unsigned char sensecmdlen;
 	unsigned long sensedatalen;
 	unsigned char sensecmd[6];
 	unsigned long contr_stat;
 	unsigned long trans_bytes;

 	unsigned int priv;
 	enum dma_data_direction dma_dir;
 };

 /*-----------------------------------------------------------
 **
 **	SCSI  constants.
 **
 **-----------------------------------------------------------
 */

 /*
 **	Messages
 */

 #define	M_COMPLETE	(0x00)
 #define	M_EXTENDED	(0x01)
 #define	M_SAVE_DP	(0x02)
 #define	M_RESTORE_DP	(0x03)
 #define	M_DISCONNECT	(0x04)
 #define	M_ID_ERROR	(0x05)
 #define	M_ABORT		(0x06)
 #define	M_REJECT	(0x07)
 #define	M_NOOP		(0x08)
 #define	M_PARITY	(0x09)
 #define	M_LCOMPLETE	(0x0a)
 #define	M_FCOMPLETE	(0x0b)
 #define	M_RESET		(0x0c)
 #define	M_ABORT_TAG	(0x0d)
 #define	M_CLEAR_QUEUE	(0x0e)
 #define	M_INIT_REC	(0x0f)
 #define	M_REL_REC	(0x10)
 #define	M_TERMINATE	(0x11)
 #define	M_SIMPLE_TAG	(0x20)
 #define	M_HEAD_TAG	(0x21)
 #define	M_ORDERED_TAG	(0x22)
 #define	M_IGN_RESIDUE	(0x23)
 #define	M_IDENTIFY	(0x80)

 #define	M_X_MODIFY_DP	(0x00)
 #define	M_X_SYNC_REQ	(0x01)
 #define	M_X_WIDE_REQ	(0x03)
 #define	M_X_PPR_REQ	(0x04)

 /*
 **	Status
 */

 #define	S_GOOD		(0x00)
 #define	S_CHECK_COND	(0x02)
 #define	S_COND_MET	(0x04)
 #define	S_BUSY		(0x08)
 #define	S_INT		(0x10)
 #define	S_INT_COND_MET	(0x14)
 #define	S_CONFLICT	(0x18)
 #define	S_TERMINATED	(0x20)
 #define	S_QUEUE_FULL	(0x28)
 #define	S_ILLEGAL	(0xff)
 #define	S_SENSE		(0x80)

 /*
  * Sense_keys
  */

 #define SENSE_NO_SENSE				0x0
 #define SENSE_RECOVERED_ERROR	0x1
 #define SENSE_NOT_READY				0x2
 #define SENSE_MEDIUM_ERROR		0x3
 #define SENSE_HARDWARE_ERROR	0x4
 #define SENSE_ILLEGAL_REQUEST	0x5
 #define SENSE_UNIT_ATTENTION	0x6
 #define SENSE_DATA_PROTECT		0x7
 #define SENSE_BLANK_CHECK			0x8
 #define SENSE_VENDOR_SPECIFIC	0x9
 #define SENSE_COPY_ABORTED		0xA
 #define SENSE_ABORTED_COMMAND	0xB
 #define SENSE_VOLUME_OVERFLOW	0xD
 #define SENSE_MISCOMPARE			0xE

 #define SCSI_CHANGE_DEF	0x40		/* Change Definition (Optional) */
 #define SCSI_COMPARE		0x39		/* Compare (O) */
 #define SCSI_COPY			0x18		/* Copy (O) */
 #define SCSI_COP_VERIFY	0x3A		/* Copy and Verify (O) */
 #define SCSI_INQUIRY		0x12		/* Inquiry (MANDATORY) */
 #define SCSI_LOG_SELECT	0x4C		/* Log Select (O) */
 #define SCSI_LOG_SENSE	0x4D		/* Log Sense (O) */
 #define SCSI_MODE_SEL6	0x15		/* Mode Select 6-byte (Device Specific) */
 #define SCSI_MODE_SEL10	0x55		/* Mode Select 10-byte (Device Specific) */
 #define SCSI_MODE_SEN6	0x1A		/* Mode Sense 6-byte (Device Specific) */
 #define SCSI_MODE_SEN10	0x5A		/* Mode Sense 10-byte (Device Specific) */
 #define SCSI_READ_BUFF	0x3C		/* Read Buffer (O) */
 #define SCSI_REQ_SENSE	0x03		/* Request Sense (MANDATORY) */
 #define SCSI_SEND_DIAG	0x1D		/* Send Diagnostic (O) */
 #define SCSI_TST_U_RDY	0x00		/* Test Unit Ready (MANDATORY) */
 #define SCSI_WRITE_BUFF	0x3B		/* Write Buffer (O) */
 /***************************************************************************
  *			  %%% Commands Unique to Direct Access Devices %%%
  ***************************************************************************/
 #define SCSI_COMPARE		0x39		/* Compare (O) */
 #define SCSI_FORMAT		0x04		/* Format Unit (MANDATORY) */
 #define SCSI_LCK_UN_CAC	0x36		/* Lock Unlock Cache (O) */
 #define SCSI_PREFETCH	0x34		/* Prefetch (O) */
 #define SCSI_MED_REMOVL	0x1E		/* Prevent/Allow medium Removal (O) */
 #define SCSI_READ6		0x08		/* Read 6-byte (MANDATORY) */
 #define SCSI_READ10		0x28		/* Read 10-byte (MANDATORY) */
 #define SCSI_READ16	0x48
 #define SCSI_RD_CAPAC	0x25		/* Read Capacity (MANDATORY) */
 #define SCSI_RD_CAPAC10	SCSI_RD_CAPAC	/* Read Capacity (10) */
 #define SCSI_RD_CAPAC16	0x9e		/* Read Capacity (16) */
 #define SCSI_RD_DEFECT	0x37		/* Read Defect Data (O) */
 #define SCSI_READ_LONG	0x3E		/* Read Long (O) */
 #define SCSI_REASS_BLK	0x07		/* Reassign Blocks (O) */
 #define SCSI_RCV_DIAG	0x1C		/* Receive Diagnostic Results (O) */
 #define SCSI_RELEASE	0x17		/* Release Unit (MANDATORY) */
 #define SCSI_REZERO		0x01		/* Rezero Unit (O) */
 #define SCSI_SRCH_DAT_E	0x31		/* Search Data Equal (O) */
 #define SCSI_SRCH_DAT_H	0x30		/* Search Data High (O) */
 #define SCSI_SRCH_DAT_L	0x32		/* Search Data Low (O) */
 #define SCSI_SEEK6		0x0B		/* Seek 6-Byte (O) */
 #define SCSI_SEEK10		0x2B		/* Seek 10-Byte (O) */
 #define SCSI_SEND_DIAG	0x1D		/* Send Diagnostics (MANDATORY) */
 #define SCSI_SET_LIMIT	0x33		/* Set Limits (O) */
 #define SCSI_START_STP	0x1B		/* Start/Stop Unit (O) */
 #define SCSI_SYNC_CACHE	0x35		/* Synchronize Cache (O) */
 #define SCSI_VERIFY		0x2F		/* Verify (O) */
 #define SCSI_WRITE6		0x0A		/* Write 6-Byte (MANDATORY) */
 #define SCSI_WRITE10	0x2A		/* Write 10-Byte (MANDATORY) */
 #define SCSI_WRT_VERIFY	0x2E		/* Write and Verify (O) */
 #define SCSI_WRITE_LONG	0x3F		/* Write Long (O) */
 #define SCSI_WRITE_SAME	0x41		/* Write Same (O) */

 /**
  * enum scsi_cmd_phase - current phase of the SCSI protocol
  *
  * @SCSIPH_START: Start phase
  * @SCSIPH_DATA: Data phase
  * @SCSIPH_STATUS: Status phase
  */
 enum scsi_cmd_phase {
 	SCSIPH_START,
 	SCSIPH_DATA,
 	SCSIPH_STATUS,
 };

 /**
  * struct scsi_inquiry_resp - holds a SCSI inquiry command
  *
  * @type; command type
  * @flags; command flags
  * @version; command version
  * @data_format; data format
  * @additional_len; additional data length
  * @spare[3]; spare bytes
  * @vendor[8]; vendor information
  * @product[16]; production information
  * @revision[4]; revision information
  */
 struct scsi_inquiry_resp {
 	u8 type;
 	u8 flags;
 	u8 version;
 	u8 data_format;
 	u8 additional_len;
 	u8 spare[3];
 	char vendor[8];
 	char product[16];
 	char revision[4];
 };

 /**
  * struct scsi_read_capacity_resp - holds the response to a read-capacity cmd
  *
  * @last_block_addr: Logical block address of last block
  * @block_len: Length of each block in bytes
  */
 struct scsi_read_capacity_resp {
 	u32 last_block_addr;
 	u32 block_len;
 };

 /**
  * struct scsi_read10_req - holds a SCSI READ10 request
  *
  * @cmd; command type
  * @lun_flags; LUN flags
  * @lba; Logical block address to start reading from
  * @spare; spare bytes
  * @xfer_len: number of blocks to read
  * @spare2: more spare bytes
  */
 struct __packed scsi_read10_req {
 	u8 cmd;
 	u8 lun_flags;
 	u32 lba;
 	u8 spare;
 	u16 xfer_len;
 	u8 spare2[3];
 };

 /** struct scsi_write10_req - data for the write10 command */
 struct __packed scsi_write10_req {
 	u8 cmd;
 	u8 lun_flags;
 	u32 lba;
 	u8 spare;
 	u16 xfer_len;
 	u8 spare2[3];
 };

 /**
  * struct scsi_plat - stores information about SCSI controller
  *
  * @base: Controller base address
  * @max_lun: Maximum number of logical units
  * @max_id: Maximum number of target ids
  * @max_bytes_per_req: Maximum number of bytes per read/write request
  */
 struct scsi_plat {
 	unsigned long base;
 	unsigned long max_lun;
 	unsigned long max_id;
 	unsigned long max_bytes_per_req;
 };

 /* Operations for SCSI */
 struct scsi_ops {
 	/**
 	 * exec() - execute a command
 	 *
 	 * @dev:	SCSI bus
 	 * @cmd:	Command to execute
 	 * @return 0 if OK, -ve on error
 	 */
 	int (*exec)(struct udevice *dev, struct scsi_cmd *cmd);

 	/**
 	 * bus_reset() - reset the bus
 	 *
 	 * @dev:	SCSI bus to reset
 	 * @return 0 if OK, -ve on error
 	 */
 	int (*bus_reset)(struct udevice *dev);

 #if IS_ENABLED(CONFIG_BOUNCE_BUFFER)
 	/**
 	 * buffer_aligned() - test memory alignment of block operation buffer
 	 *
 	 * Some devices have limited DMA capabilities and require that the
 	 * buffers passed to them fit specific properties. This optional
 	 * callback can be used to indicate whether a buffer alignment is
 	 * suitable for the device DMA or not, and trigger use of generic
 	 * bounce buffer implementation to help use of unsuitable buffers
 	 * at the expense of performance degradation.
 	 *
 	 * @dev:	Block device associated with the request
 	 * @state:	Bounce buffer state
 	 * @return 1 if OK, 0 if unaligned
 	 */
 	int (*buffer_aligned)(struct udevice *dev, struct bounce_buffer *state);
 #endif	/* CONFIG_BOUNCE_BUFFER */
 };

 #define scsi_get_ops(dev)        ((struct scsi_ops *)(dev)->driver->ops)

 extern struct scsi_ops scsi_ops;

 /**
  * scsi_exec() - execute a command
  *
  * @dev:	SCSI bus
  * @cmd:	Command to execute
  * Return: 0 if OK, -ve on error
  */
 int scsi_exec(struct udevice *dev, struct scsi_cmd *cmd);

 /**
  * scsi_bus_reset() - reset the bus
  *
  * @dev:	SCSI bus to reset
  * Return: 0 if OK, -ve on error
  */
 int scsi_bus_reset(struct udevice *dev);

 /**
  * scsi_scan() - Scan all SCSI controllers for available devices
  *
  * @vebose: true to show information about each device found
  */
 int scsi_scan(bool verbose);

 /**
  * scsi_scan_dev() - scan a SCSI bus and create devices
  *
  * @dev:	SCSI bus
  * @verbose:	true to show information about each device found
  */
 int scsi_scan_dev(struct udevice *dev, bool verbose);

 #define SCSI_IDENTIFY					0xC0  /* not used */

 /* Hardware errors  */
 #define SCSI_SEL_TIME_OUT			 0x00000101	 /* Selection time out */
 #define SCSI_HNS_TIME_OUT			 0x00000102  /* Handshake */
 #define SCSI_MA_TIME_OUT			 0x00000103  /* Phase error */
 #define SCSI_UNEXP_DIS				 0x00000104  /* unexpected disconnect */

 #define SCSI_INT_STATE				 0x00010000  /* unknown Interrupt number is stored in 16 LSB */

 #endif /* _SCSI_H */
	/* SPDX-License-Identifier: GPL-2.0+ */
	/*
	* (C) Copyright 2001
	* Denis Peter, MPL AG Switzerland
	*/
	#ifndef _SCSI_H
	#define _SCSI_H

	#include <asm/cache.h>
	#include <bouncebuf.h>
	#include <linux/dma-direction.h>

	struct udevice;

	/**
	* struct scsi_cmd - information about a SCSI command to be processed
	*
	* @cmd: command
	* @sense_buf: for request sense
	* @status: SCSI Status
	* @target: Target ID
	* @lun: Target LUN
	* @cmdlen: command len
	* @datalen: Total data length
	* @pdata: pointer to data
	* @msgout: Messge out buffer (NOT USED)
	* @msgin: Message in buffer
	* @sensecmdlen: Sense command len
	* @sensedatalen: Sense data len
	* @sensecmd: Sense command
	* @contr_stat: Controller Status
	* @trans_bytes: tranfered bytes
	* @priv: Private value
	* @dma_dir: Direction of data structure
	*/
	struct scsi_cmd {
	unsigned char cmd[16];
	unsigned char sense_buf[64]
	__attribute__((aligned(ARCH_DMA_MINALIGN)));
	unsigned char status;
	unsigned char target;
	unsigned char lun;
	unsigned char cmdlen;
	unsigned long datalen;
	unsigned char *pdata;
	unsigned char msgout[12];
	unsigned char msgin[12];
	unsigned char sensecmdlen;
	unsigned long sensedatalen;
	unsigned char sensecmd[6];
	unsigned long contr_stat;
	unsigned long trans_bytes;

	unsigned int priv;
	enum dma_data_direction dma_dir;
	};

	/*-----------------------------------------------------------
	**
	** SCSI constants.
	**
	**-----------------------------------------------------------
	*/

	/*
	** Messages
	*/

	#define M_COMPLETE (0x00)
	#define M_EXTENDED (0x01)
	#define M_SAVE_DP (0x02)
	#define M_RESTORE_DP (0x03)
	#define M_DISCONNECT (0x04)
	#define M_ID_ERROR (0x05)
	#define M_ABORT (0x06)
	#define M_REJECT (0x07)
	#define M_NOOP (0x08)
	#define M_PARITY (0x09)
	#define M_LCOMPLETE (0x0a)
	#define M_FCOMPLETE (0x0b)
	#define M_RESET (0x0c)
	#define M_ABORT_TAG (0x0d)
	#define M_CLEAR_QUEUE (0x0e)
	#define M_INIT_REC (0x0f)
	#define M_REL_REC (0x10)
	#define M_TERMINATE (0x11)
	#define M_SIMPLE_TAG (0x20)
	#define M_HEAD_TAG (0x21)
	#define M_ORDERED_TAG (0x22)
	#define M_IGN_RESIDUE (0x23)
	#define M_IDENTIFY (0x80)

	#define M_X_MODIFY_DP (0x00)
	#define M_X_SYNC_REQ (0x01)
	#define M_X_WIDE_REQ (0x03)
	#define M_X_PPR_REQ (0x04)

	/*
	** Status
	*/

	#define S_GOOD (0x00)
	#define S_CHECK_COND (0x02)
	#define S_COND_MET (0x04)
	#define S_BUSY (0x08)
	#define S_INT (0x10)
	#define S_INT_COND_MET (0x14)
	#define S_CONFLICT (0x18)
	#define S_TERMINATED (0x20)
	#define S_QUEUE_FULL (0x28)
	#define S_ILLEGAL (0xff)
	#define S_SENSE (0x80)

	/*
	* Sense_keys
	*/

	#define SENSE_NO_SENSE 0x0
	#define SENSE_RECOVERED_ERROR 0x1
	#define SENSE_NOT_READY 0x2
	#define SENSE_MEDIUM_ERROR 0x3
	#define SENSE_HARDWARE_ERROR 0x4
	#define SENSE_ILLEGAL_REQUEST 0x5
	#define SENSE_UNIT_ATTENTION 0x6
	#define SENSE_DATA_PROTECT 0x7
	#define SENSE_BLANK_CHECK 0x8
	#define SENSE_VENDOR_SPECIFIC 0x9
	#define SENSE_COPY_ABORTED 0xA
	#define SENSE_ABORTED_COMMAND 0xB
	#define SENSE_VOLUME_OVERFLOW 0xD
	#define SENSE_MISCOMPARE 0xE

	#define SCSI_CHANGE_DEF 0x40 /* Change Definition (Optional) */
	#define SCSI_COMPARE 0x39 /* Compare (O) */
	#define SCSI_COPY 0x18 /* Copy (O) */
	#define SCSI_COP_VERIFY 0x3A /* Copy and Verify (O) */
	#define SCSI_INQUIRY 0x12 /* Inquiry (MANDATORY) */
	#define SCSI_LOG_SELECT 0x4C /* Log Select (O) */
	#define SCSI_LOG_SENSE 0x4D /* Log Sense (O) */
	#define SCSI_MODE_SEL6 0x15 /* Mode Select 6-byte (Device Specific) */
	#define SCSI_MODE_SEL10 0x55 /* Mode Select 10-byte (Device Specific) */
	#define SCSI_MODE_SEN6 0x1A /* Mode Sense 6-byte (Device Specific) */
	#define SCSI_MODE_SEN10 0x5A /* Mode Sense 10-byte (Device Specific) */
	#define SCSI_READ_BUFF 0x3C /* Read Buffer (O) */
	#define SCSI_REQ_SENSE 0x03 /* Request Sense (MANDATORY) */
	#define SCSI_SEND_DIAG 0x1D /* Send Diagnostic (O) */
	#define SCSI_TST_U_RDY 0x00 /* Test Unit Ready (MANDATORY) */
	#define SCSI_WRITE_BUFF 0x3B /* Write Buffer (O) */
	/***************************************************************************
	* %%% Commands Unique to Direct Access Devices %%%
	***************************************************************************/
	#define SCSI_COMPARE 0x39 /* Compare (O) */
	#define SCSI_FORMAT 0x04 /* Format Unit (MANDATORY) */
	#define SCSI_LCK_UN_CAC 0x36 /* Lock Unlock Cache (O) */
	#define SCSI_PREFETCH 0x34 /* Prefetch (O) */
	#define SCSI_MED_REMOVL 0x1E /* Prevent/Allow medium Removal (O) */
	#define SCSI_READ6 0x08 /* Read 6-byte (MANDATORY) */
	#define SCSI_READ10 0x28 /* Read 10-byte (MANDATORY) */
	#define SCSI_READ16 0x48
	#define SCSI_RD_CAPAC 0x25 /* Read Capacity (MANDATORY) */
	#define SCSI_RD_CAPAC10 SCSI_RD_CAPAC /* Read Capacity (10) */
	#define SCSI_RD_CAPAC16 0x9e /* Read Capacity (16) */
	#define SCSI_RD_DEFECT 0x37 /* Read Defect Data (O) */
	#define SCSI_READ_LONG 0x3E /* Read Long (O) */
	#define SCSI_REASS_BLK 0x07 /* Reassign Blocks (O) */
	#define SCSI_RCV_DIAG 0x1C /* Receive Diagnostic Results (O) */
	#define SCSI_RELEASE 0x17 /* Release Unit (MANDATORY) */
	#define SCSI_REZERO 0x01 /* Rezero Unit (O) */
	#define SCSI_SRCH_DAT_E 0x31 /* Search Data Equal (O) */
	#define SCSI_SRCH_DAT_H 0x30 /* Search Data High (O) */
	#define SCSI_SRCH_DAT_L 0x32 /* Search Data Low (O) */
	#define SCSI_SEEK6 0x0B /* Seek 6-Byte (O) */
	#define SCSI_SEEK10 0x2B /* Seek 10-Byte (O) */
	#define SCSI_SEND_DIAG 0x1D /* Send Diagnostics (MANDATORY) */
	#define SCSI_SET_LIMIT 0x33 /* Set Limits (O) */
	#define SCSI_START_STP 0x1B /* Start/Stop Unit (O) */
	#define SCSI_SYNC_CACHE 0x35 /* Synchronize Cache (O) */
	#define SCSI_VERIFY 0x2F /* Verify (O) */
	#define SCSI_WRITE6 0x0A /* Write 6-Byte (MANDATORY) */
	#define SCSI_WRITE10 0x2A /* Write 10-Byte (MANDATORY) */
	#define SCSI_WRT_VERIFY 0x2E /* Write and Verify (O) */
	#define SCSI_WRITE_LONG 0x3F /* Write Long (O) */
	#define SCSI_WRITE_SAME 0x41 /* Write Same (O) */

	/**
	* enum scsi_cmd_phase - current phase of the SCSI protocol
	*
	* @SCSIPH_START: Start phase
	* @SCSIPH_DATA: Data phase
	* @SCSIPH_STATUS: Status phase
	*/
	enum scsi_cmd_phase {
	SCSIPH_START,
	SCSIPH_DATA,
	SCSIPH_STATUS,
	};

	/**
	* struct scsi_inquiry_resp - holds a SCSI inquiry command
	*
	* @type; command type
	* @flags; command flags
	* @version; command version
	* @data_format; data format
	* @additional_len; additional data length
	* @spare[3]; spare bytes
	* @vendor[8]; vendor information
	* @product[16]; production information
	* @revision[4]; revision information
	*/
	struct scsi_inquiry_resp {
	u8 type;
	u8 flags;
	u8 version;
	u8 data_format;
	u8 additional_len;
	u8 spare[3];
	char vendor[8];
	char product[16];
	char revision[4];
	};

	/**
	* struct scsi_read_capacity_resp - holds the response to a read-capacity cmd
	*
	* @last_block_addr: Logical block address of last block
	* @block_len: Length of each block in bytes
	*/
	struct scsi_read_capacity_resp {
	u32 last_block_addr;
	u32 block_len;
	};

	/**
	* struct scsi_read10_req - holds a SCSI READ10 request
	*
	* @cmd; command type
	* @lun_flags; LUN flags
	* @lba; Logical block address to start reading from
	* @spare; spare bytes
	* @xfer_len: number of blocks to read
	* @spare2: more spare bytes
	*/
	struct __packed scsi_read10_req {
	u8 cmd;
	u8 lun_flags;
	u32 lba;
	u8 spare;
	u16 xfer_len;
	u8 spare2[3];
	};

	/** struct scsi_write10_req - data for the write10 command */
	struct __packed scsi_write10_req {
	u8 cmd;
	u8 lun_flags;
	u32 lba;
	u8 spare;
	u16 xfer_len;
	u8 spare2[3];
	};

	/**
	* struct scsi_plat - stores information about SCSI controller
	*
	* @base: Controller base address
	* @max_lun: Maximum number of logical units
	* @max_id: Maximum number of target ids
	* @max_bytes_per_req: Maximum number of bytes per read/write request
	*/
	struct scsi_plat {
	unsigned long base;
	unsigned long max_lun;
	unsigned long max_id;
	unsigned long max_bytes_per_req;
	};

	/* Operations for SCSI */
	struct scsi_ops {
	/**
	* exec() - execute a command
	*
	* @dev: SCSI bus
	* @cmd: Command to execute
	* @return 0 if OK, -ve on error
	*/
	int (exec)(struct udevice dev, struct scsi_cmd *cmd);

	/**
	* bus_reset() - reset the bus
	*
	* @dev: SCSI bus to reset
	* @return 0 if OK, -ve on error
	*/
	int (bus_reset)(struct udevice dev);

	#if IS_ENABLED(CONFIG_BOUNCE_BUFFER)
	/**
	* buffer_aligned() - test memory alignment of block operation buffer
	*
	* Some devices have limited DMA capabilities and require that the
	* buffers passed to them fit specific properties. This optional
	* callback can be used to indicate whether a buffer alignment is
	* suitable for the device DMA or not, and trigger use of generic
	* bounce buffer implementation to help use of unsuitable buffers
	* at the expense of performance degradation.
	*
	* @dev: Block device associated with the request
	* @state: Bounce buffer state
	* @return 1 if OK, 0 if unaligned
	*/
	int (buffer_aligned)(struct udevice dev, struct bounce_buffer *state);
	#endif /* CONFIG_BOUNCE_BUFFER */
	};

	#define scsi_get_ops(dev) ((struct scsi_ops *)(dev)->driver->ops)

	extern struct scsi_ops scsi_ops;

	/**
	* scsi_exec() - execute a command
	*
	* @dev: SCSI bus
	* @cmd: Command to execute
	* Return: 0 if OK, -ve on error
	*/
	int scsi_exec(struct udevice dev, struct scsi_cmd cmd);

	/**
	* scsi_bus_reset() - reset the bus
	*
	* @dev: SCSI bus to reset
	* Return: 0 if OK, -ve on error
	*/
	int scsi_bus_reset(struct udevice *dev);

	/**
	* scsi_scan() - Scan all SCSI controllers for available devices
	*
	* @vebose: true to show information about each device found
	*/
	int scsi_scan(bool verbose);

	/**
	* scsi_scan_dev() - scan a SCSI bus and create devices
	*
	* @dev: SCSI bus
	* @verbose: true to show information about each device found
	*/
	int scsi_scan_dev(struct udevice *dev, bool verbose);

	#define SCSI_IDENTIFY 0xC0 /* not used */

	/* Hardware errors */
	#define SCSI_SEL_TIME_OUT 0x00000101 /* Selection time out */
	#define SCSI_HNS_TIME_OUT 0x00000102 /* Handshake */
	#define SCSI_MA_TIME_OUT 0x00000103 /* Phase error */
	#define SCSI_UNEXP_DIS 0x00000104 /* unexpected disconnect */

	#define SCSI_INT_STATE 0x00010000 /* unknown Interrupt number is stored in 16 LSB */

	#endif /* _SCSI_H */