/* blz1230.h: Defines and structures for the Blizzard 1230 SCSI IV driver.
 *
 * Copyright (C) 1996 Jesper Skov (jskov@cygnus.co.uk)
 *
 * This file is based on cyber_esp.h (hence the occasional reference to
 * CyberStorm).
 */

#include "NCR53C9x.h"

#ifndef BLZ1230_H
#define BLZ1230_H

/* The controller registers can be found in the Z2 config area at these
 * offsets:
 */
#define BLZ1230_ESP_ADDR 0x8000
#define BLZ1230_DMA_ADDR 0x10000
#define BLZ1230II_ESP_ADDR 0x10000
#define BLZ1230II_DMA_ADDR 0x10021


/* The Blizzard 1230 DMA interface
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 * Only two things can be programmed in the Blizzard DMA:
 *  1) The data direction is controlled by the status of bit 31 (1 = write)
 *  2) The source/dest address (word aligned, shifted one right) in bits 30-0
 *
 * Program DMA by first latching the highest byte of the address/direction
 * (i.e. bits 31-24 of the long word constructed as described in steps 1+2
 * above). Then write each byte of the address/direction (starting with the
 * top byte, working down) to the DMA address register.
 *
 * Figure out interrupt status by reading the ESP status byte.
 */
struct blz1230_dma_registers {
	volatile unsigned char dma_addr; 	/* DMA address      [0x0000] */
	unsigned char dmapad2[0x7fff];
	volatile unsigned char dma_latch; 	/* DMA latch        [0x8000] */
};

struct blz1230II_dma_registers {
	volatile unsigned char dma_addr; 	/* DMA address      [0x0000] */
	unsigned char dmapad2[0xf];
	volatile unsigned char dma_latch; 	/* DMA latch        [0x0010] */
};

#define BLZ1230_DMA_WRITE 0x80000000

extern int blz1230_esp_detect(struct SHT *);
extern const char *esp_info(struct Scsi_Host *);
extern int esp_queue(Scsi_Cmnd *, void (*done)(Scsi_Cmnd *));
extern int esp_command(Scsi_Cmnd *);
extern int esp_abort(Scsi_Cmnd *);
extern int esp_reset(Scsi_Cmnd *, unsigned int);
extern int esp_proc_info(char *buffer, char **start, off_t offset, int length,
			 int hostno, int inout);

#define SCSI_BLZ1230      { proc_dir:		&proc_scsi_esp, \
			    name:		"Blizzard1230 SCSI IV", \
			    detect:		blz1230_esp_detect, \
			    release:		NULL, \
			    queuecommand:	esp_queue, \
			    abort:		esp_abort, \
			    reset:		esp_reset, \
			    can_queue:          7, \
			    this_id:		7, \
			    sg_tablesize:	SG_ALL, \
			    cmd_per_lun:	1, \
			    use_clustering:	DISABLE_CLUSTERING }

#endif /* BLZ1230_H */
