linux-imx

/* SPDX-License-Identifier: GPL-2.0 */

/* -*- mode: c; c-basic-offset: 8 -*- */

​

/* Driver for 53c700 and 53c700-66 chips from NCR and Symbios

 *

 * Copyright (C) 2001 by James.Bottomley@HansenPartnership.com

 */

​

#ifndef _53C700_H

#define _53C700_H

​

#include <linux/interrupt.h>

#include <asm/io.h>

​

#include <scsi/scsi_device.h>

#include <scsi/scsi_cmnd.h>

​

/* Turn on for general debugging---too verbose for normal use */

#undef  NCR_700_DEBUG

/* Debug the tag queues, checking hash queue allocation and deallocation

 * and search for duplicate tags */

#undef NCR_700_TAG_DEBUG

​

#ifdef NCR_700_DEBUG

#define DEBUG(x)    printk x

#define DDEBUG(prefix, sdev, fmt, a...) \

    sdev_printk(prefix, sdev, fmt, ##a)

#define CDEBUG(prefix, scmd, fmt, a...) \

    scmd_printk(prefix, scmd, fmt, ##a)

#else

#define DEBUG(x)    do {} while (0)

#define DDEBUG(prefix, scmd, fmt, a...) do {} while (0)

#define CDEBUG(prefix, scmd, fmt, a...) do {} while (0)

#endif

​

/* The number of available command slots */

#define NCR_700_COMMAND_SLOTS_PER_HOST  64

/* The maximum number of Scatter Gathers we allow */

#define NCR_700_SG_SEGMENTS     32

/* The maximum number of luns (make this of the form 2^n) */

#define NCR_700_MAX_LUNS        32

#define NCR_700_LUN_MASK        (NCR_700_MAX_LUNS - 1)

/* Maximum number of tags the driver ever allows per device */

#define NCR_700_MAX_TAGS        16

/* Tag depth the driver starts out with (can be altered in sysfs) */

#define NCR_700_DEFAULT_TAGS        4

/* This is the default number of commands per LUN in the untagged case.

 * two is a good value because it means we can have one command active and

 * one command fully prepared and waiting

 */

#define NCR_700_CMD_PER_LUN     2

/* magic byte identifying an internally generated REQUEST_SENSE command */

#define NCR_700_INTERNAL_SENSE_MAGIC    0x42

​

struct NCR_700_Host_Parameters;

​

/* These are the externally used routines */

struct Scsi_Host *NCR_700_detect(struct scsi_host_template *,

        struct NCR_700_Host_Parameters *, struct device *);

int NCR_700_release(struct Scsi_Host *host);

irqreturn_t NCR_700_intr(int, void *);

​

​

enum NCR_700_Host_State {

    NCR_700_HOST_BUSY,

    NCR_700_HOST_FREE,

};

​

struct NCR_700_SG_List {

    /* The following is a script fragment to move the buffer onto the

     * bus and then link the next fragment or return */

    #define SCRIPT_MOVE_DATA_IN     0x09000000

    #define SCRIPT_MOVE_DATA_OUT        0x08000000

    __u32   ins;

    __u32   pAddr;

    #define SCRIPT_NOP          0x80000000

    #define SCRIPT_RETURN           0x90080000

};

​

struct NCR_700_Device_Parameters {

    /* space for creating a request sense command. Really, except

     * for the annoying SCSI-2 requirement for LUN information in

     * cmnd[1], this could be in static storage */

    unsigned char cmnd[MAX_COMMAND_SIZE];

    __u8    depth;

    struct scsi_cmnd *current_cmnd; /* currently active command */

};

​

​

/* The SYNC negotiation sequence looks like:

 * 

 * If DEV_NEGOTIATED_SYNC not set, tack and SDTR message on to the