/* 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 */