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/*
 * @(#)dcu.h	3.5	7/14/83
 * @(#)Copyright (C) 1983 by National Semiconductor Corp.
 */

/* Definitions for Mesa 16000 DCU (disk controller) */

/* status bits in immediate status byte (DCUA_STATUS) */
#define DCUS_CHAN1	0x03		/* channel 1 status code */
#define DCUS_CHAN0	0x0c		/* channel 0 status code */
#define DCUS_AUXERR	0x10		/* auxillery error (illegal command) */
#define DCUS_SELFTEST	0x20		/* DCU executing self test */
#define DCUS_ERINT	0x40		/* error status in ERINT byte */
#define DCUS_READY	0x80		/* command port is ready */

/* channel status codes (in DCUIS_CHAN0 and DCUIS_CHAN1 fields) */
#define DCUSTS_BUSY	0		/* channel is executing a command */
#define DCUSTS_ERROR	1		/* command completed with error */
#define DCUSTS_DONE	2		/* command completed successfully */
#define DCUSTS_IDLE	3		/* channel is idle */

#define	DCUSTATMASK	3		/* mask to get channel status code */
#define	DCUSTATSH0	2		/* shift to position channel 0 code */
#define	DCUSTATSH1	0		/* shift to position channel 1 code */
#define	STATUS0(data)	(((data)>>DCUSTATSH0)&DCUSTATMASK) /* get DCUS_CHAN0 */
#define	STATUS1(data)	(((data)>>DCUSTATSH1)&DCUSTATMASK) /* get DCUS_CHAN1 */


/* command codes (written into DCUA_CHAN0 or DCUA_CHAN1 bytes) */
#define DCUC_SELFTEST	0x16		/* self test */
#define	DCUC_START	0x18		/* start port for channel command */
#define DCUC_SENSE	0x84		/* sense I/O */
#define DCUC_SETBURST	0x74		/* set burst/interleave */
#define DCUC_ASSDRIVE	0x20		/* assign drive */
#define DCUC_ASSCYLINDER 0x2e		/* assign cylinder */
#define DCUC_ASSBUFFER	0x42		/* assign buffer address */
#define	DCUC_WRITE	0xe6		/* disk write */
#define DCUC_READ	0xde		/* disk read */
#define DCUC_FORMAT	0xbc		/* format write */
#define	DCUC_SPECIFIC	0xe8		/* drive specific (seek, rezero) */
#define DCUC_DIAGREAD	0x8a		/* diagnostic memory read */
#define DCUC_DIAGWRITE	0xb2		/* diagnostic memory write */

/* drive specific codes (used with DCUC_SPECIFIC command) */
#define DCUC_ENABLE	0x41		/* write protect/enable a drive */
#define DCUC_REZERO	0x04		/* seek to cylinder 0, write protect */
#define DCUC_SEEK	0x03		/* seek to cylinder */


/* Macros to define data for various commands */
#define	DCUD_DRIVE(drive)	((drive)<<13)
					/* data for DCU_ASSDRIVE */
#define	DCUD_SEEK		(DCUC_SEEK<<8)
					/* data for DCUC_SPECIFIC */
#define	DCUD_ENABLE(bit)	((DCUC_ENABLE<<8)|((bit)<<7))
					/* data for DCUC_SPECIFIC */
#define	DCUD_DHS(drive,head,sector) (((drive)<<13)|((head)<<8)|(sector))
					/* data for DCU_READ and DCU_WRITE */



/* Structure of a IOCB block for channel IO (started with DCUC_START) */

struct dcu_iocb {
/* The following is not used by the controller, but is here for convenience. */
/* ALSO, it makes all of the offsets for the data correctly word aligned. */
	unsigned short	dcuio_skip;	/* number of sectors skipped */

/* The following is the actual data used by the controller */
	unsigned char	dcuio_opcode;	/* DCU command opcode */
	unsigned char	dcuio_res1;	/* reserved */
	unsigned char	dcuio_drivepar;	/* drive parameter out */
	unsigned char	dcuio_count;	/* count of sectors to transfer */
	unsigned short	dcuio_res2;	/* reserved */
	unsigned short	dcuio_cylinder;	/* cylinder for transfer */
	unsigned short	dcuio_drhdsec;	/* drive, head, and sector */
	unsigned long	dcuio_buffer;	/* address of buffer table */
	unsigned long	dcuio_sense;	/* sense bytes 0, 1, 2, and 3 */
	unsigned long	dcuio_ecc;	/* ecc bytes 0, 1, 2, and 3 */
	unsigned long	dcuio_chain;	/* address of next IOCB in chain */
	unsigned char	dcuio_status;	/* ending status byte */
	unsigned char	dcuio_resid;	/* number of sectors not transfered */
};

#define	dcuio_drivecmmd dcuio_sectors	/* drive specific data */
#define	IOCHAIN	(0x80000000)		/* bit in dcuio_chain to validate it */


/* bit fields inside of the ending status byte of the IOCB (dcuio_status) */
#define	DCUES_DRIVCHECK	0x08		/* drive check (in sense bytes 1-3) */
#define	DCUES_CTRLCHECK	0x10		/* controller check (in ctrl fault) */
#define	DCUES_BUSCHECK	0x20		/* bus check (in DCUSEN_BUSFAULT) */
#define	DCUES_CHAIN	0x40		/* command chain acknowledge */
#define	DCUES_DONE	0x80		/* done with all IOCBs */



/* Sense bytes. Read by the DCUC_SENSE immediate commmand, or automatically
 * stored in the dcuio_sense field of the IOCB block if command chaining and
 * and error occurs.
 */
struct	dcu_sense {
	long	dcusb_sense;		/* sense bytes 0 - 3 (see below) */
	long	dcusb_ecc;		/* sense bytes 4 - 7 (ecc data) */
};

#define DCUSB_SEQERR	0x00000001	/* sequence error */
#define DCUSB_BUSFAULT	0x0000000e	/* bus fault error code */
#define DCUSB_CTLFAULT	0x000000f0	/* control fault error code */
#define DCUSB_NOTREADY	0x00000100	/* device not ready */
#define DCUSB_BUSERROR	0x00000200	/* control bus error */
#define DCUSB_ILLCMMD	0x00000400	/* illegal command */
#define DCUSB_ILLPARAM	0x00000800	/* illegal parameter */
#define DCUSB_SENSE2	0x00001000	/* sense byte 2 nonzero */
#define DCUSB_SENSE3	0x00002000	/* sense byte 3 nonzero */
#define DCUSB_BUSY	0x00004000	/* busy executing */
#define DCUSB_NORMAL	0x00008000	/* normal completion */
#define DCUSB_SEEKERR	0x00010000	/* seek error */
#define DCUSB_RWFAULT	0x00020000	/* read/write fault */
#define DCUSB_POWER	0x00040000	/* power fault */
#define DCUSB_VIOLATION	0x00080000	/* read/write permit violation */
#define DCUSB_SPEEDERR	0x00100000	/* speed error */
#define DCUSB_REJECT	0x00200000	/* command reject */
#define DCUSB_OTHERERR	0x00400000	/* other errors */
#define DCUSB_VENDORERR 0x00800000	/* vendor unique errors */
#define DCUSB_INITSTATE 0x01000000	/* initial state */
#define DCUSB_RDYTRANS	0x02000000	/* ready transition */
#define DCUSB_THISPORT	0x04000000	/* reserved to this port */
#define DCUSB_RELEASED	0x08000000	/* forced release */
#define DCUSB_ALTPORT	0x10000000	/* reserved to alternate port */
#define DCUSB_ATTMOD	0x20000000	/* attribute table modified */
#define DCUSB_WRITELOCK	0x40000000	/* within write-protected area */
#define DCUSB_VENDATTN	0x80000000	/* vendor unique attentions */


/* macros to extract fields from the sense bytes */
#define	BUSFAULTCODE(data)	(((data) & DCUSB_BUSFAULT) >> 1)
#define	CTLFAULTCODE(data)	(((data) & DCUSB_CTLFAULT) >> 4)


/* bus fault definitions (in DCUSB_BUSFAULT field of the sense bytes) */
#define	DCUBF_NOERROR	0		/* no error */
#define	DCUBF_DRIVETIME	1		/* drive acknowledge time-out */
#define	DCUBF_MESAERROR	2		/* Mesa interface error detected */
#define	DCUBF_PARITY	3		/* cbus input parity error */
#define	DCUBF_INDEXTIME	4		/* index/sector pulse time-out */
#define	DCUBF_WORDTIME	5		/* word flag time-out */
#define	DCUBF_DMATIME	6		/* DMA transfer time-out */
#define	DCUBF_CBUSBUSY	7		/* cbus busy */

/* control fault codes (in dcus_ctrlfault field of the sense bytes) */
#define	DCUCF_NOERROR	0		/* no error */
#define	DCUCF_OCCUPIED	1		/* drive occupied */
#define	DCUCF_NOSECTOR	2		/* sector not found */
#define	DCUCF_ECCHEADER	3		/* ecc error in header field */
#define	DCUCF_ECCDATA	4		/* ecc error in data field */
#define	DCUCF_ILLPARAM	5		/* illegal dcu parameter */
#define	DCUCF_ILLCMMD	6		/* illegal dcu command */
#define	DCUCF_REJECT	7		/* reject dcu command */
#define	DCUCF_WRITELOCK	8		/* write protection error */
#define	DCUCF_MEMERROR	9		/* memory read error */
#define	DCUCF_SYNCERROR	10		/* sync error in data field */
#define	DCUCF_DRIVEERR	11		/* drive fault */
#define	DCUCF_NODRIVES	12		/* no available drive */
#define	DCUCF_DRIVEADDR	13		/* incorrect drive address */
					/* codes 14-15 are undefined */
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