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/*

 *  hosts.c Copyright (C) 1992 Drew Eckhardt

 *          Copyright (C) 1993, 1994, 1995 Eric Youngdale

 *

 *  mid to lowlevel SCSI driver interface

 *      Initial versions: Drew Eckhardt

 *      Subsequent revisions: Eric Youngdale

 *

 *  <drew@colorado.edu>

 */

/*

 *  This file contains the medium level SCSI

 *  host interface initialization, as well as the scsi_hosts array of SCSI

 *  hosts currently present in the system.

 */

/*

 * Don't import our own symbols, as this would severely mess up our

 * symbol tables.

 */

#define _SCSI_SYMS_VER_

#define __NO_VERSION__

#include <linux/module.h>

#include <linux/config.h>

#include <linux/blk.h>

#include <linux/kernel.h>

#include <linux/string.h>

#include <linux/mm.h>

#include <linux/proc_fs.h>

#include "scsi.h"

#ifndef NULL

#define NULL 0L

#endif

#define HOSTS_C

#include "hosts.h"

#ifdef CONFIG_SCSI_ACORNSCSI_3

#include "acornscsi.h"

#endif

#ifdef CONFIG_SCSI_CUMANA_1

#include "cumana_1.h"

#endif

#ifdef CONFIG_SCSI_OAK1

#include "oak.h"

#endif

#ifdef CONFIG_SCSI_ECOSCSI

#include "ecoscsi.h"

#endif

#ifdef CONFIG_SCSI_POWERTECSCSI

#include "powertec.h"

#endif

#ifdef CONFIG_SCSI_EESOXSCSI

#include "eesox.h"

#endif

#ifdef CONFIG_BLK_DEV_IDESCSI

#include "ide-scsi.h"

#endif

#ifdef CONFIG_SCSI_DEBUG

#include "scsi_debug.h"

#endif

/*

static const char RCSid[] = "$Header: /home/marcus/revision_ctrl_test/oc_cvs/cvs/or1k/rc203soc/sw/uClinux/arch/armnommu/drivers/scsi/hosts.c,v 1.1 2005-12-20 09:33:29 jcastillo Exp $";

*/

/*

 *  The scsi host entries should be in the order you wish the

 *  cards to be detected.  A driver may appear more than once IFF

 *  it can deal with being detected (and therefore initialized)

 *  with more than one simultaneous host number, can handle being

 *  reentrant, etc.

 *

 *  They may appear in any order, as each SCSI host is told which host

 *  number it is during detection.

 */

/* This is a placeholder for controllers that are not configured into

 * the system - we do this to ensure that the controller numbering is

 * always consistent, no matter how the kernel is configured. */

#define NO_CONTROLLER {NULL, NULL, NULL, NULL, NULL, NULL, NULL, \

                           NULL, NULL, 0, 0, 0, 0, 0, 0}

/*

 *  When figure is run, we don't want to link to any object code.  Since

 *  the macro for each host will contain function pointers, we cannot

 *  use it and instead must use a "blank" that does no such

 *  idiocy.

 */

Scsi_Host_Template * scsi_hosts = NULL;

static Scsi_Host_Template builtin_scsi_hosts[] =

{

#ifdef CONFIG_SCSI_ACORNSCSI_3

    ACORNSCSI_3,

#endif

#ifdef CONFIG_SCSI_CUMANA_1

    CUMANA_NCR5380,

#endif

#ifdef CONFIG_SCSI_OAK1

    OAK_NCR5380,

#endif

#ifdef CONFIG_SCSI_ECOSCSI

    ECOSCSI_NCR5380,

#endif

#ifdef CONFIG_BLK_DEV_IDESCSI

    IDESCSI,

#endif

#ifdef CONFIG_SCSI_POWERTECSCSI

    POWERTECSCSI,

#endif

#ifdef CONFIG_SCSI_EESOXSCSI

    EESOXSCSI,

#endif

#ifdef CONFIG_SCSI_DEBUG

    SCSI_DEBUG,

#endif

};

#define MAX_SCSI_HOSTS (sizeof(builtin_scsi_hosts) / sizeof(Scsi_Host_Template))

/*

 *  Our semaphores and timeout counters, where size depends on

 *      MAX_SCSI_HOSTS here.

 */

struct Scsi_Host * scsi_hostlist = NULL;

struct Scsi_Device_Template * scsi_devicelist = NULL;

int max_scsi_hosts = 0;

int next_scsi_host = 0;

void

scsi_unregister(struct Scsi_Host * sh){

    struct Scsi_Host * shpnt;

    if(scsi_hostlist == sh)

        scsi_hostlist = sh->next;

    else {

        shpnt = scsi_hostlist;

        while(shpnt->next != sh) shpnt = shpnt->next;

        shpnt->next = shpnt->next->next;

    }

    /* If we are removing the last host registered, it is safe to reuse

     * its host number (this avoids "holes" at boot time) (DB)

     */

    if (max_scsi_hosts == next_scsi_host)

        max_scsi_hosts--;

    next_scsi_host--;

    scsi_init_free((char *) sh, sizeof(struct Scsi_Host) + sh->extra_bytes);

}

/* We call this when we come across a new host adapter. We only do this

 * once we are 100% sure that we want to use this host adapter -  it is a

 * pain to reverse this, so we try to avoid it

 */

struct Scsi_Host * scsi_register(Scsi_Host_Template * tpnt, int j){

    struct Scsi_Host * retval, *shpnt;

    retval = (struct Scsi_Host *)scsi_init_malloc(sizeof(struct Scsi_Host) + j,

                                                  (tpnt->unchecked_isa_dma && j ? GFP_DMA : 0) | GFP_ATOMIC);

    retval->host_busy = 0;

    retval->block = NULL;

    retval->wish_block = 0;

    if(j > 0xffff) panic("Too many extra bytes requested\n");

    retval->extra_bytes = j;

    retval->loaded_as_module = scsi_loadable_module_flag;

    retval->host_no = max_scsi_hosts++; /* never reuse host_no (DB) */

    next_scsi_host++;

    retval->host_queue = NULL;

    retval->host_wait = NULL;

    retval->last_reset = 0;

    retval->irq = 0;

    retval->dma_channel = 0xff;

    /* These three are default values which can be overridden */

    retval->max_channel = 0;

    retval->max_id = 8;

    retval->max_lun = 8;

    retval->unique_id = 0;

    retval->io_port = 0;

    retval->hostt = tpnt;

    retval->next = NULL;

#ifdef DEBUG

    printk("Register %x %x: %d\n", (int)retval, (int)retval->hostt, j);

#endif

    /* The next six are the default values which can be overridden

     * if need be */

    retval->this_id = tpnt->this_id;

    retval->can_queue = tpnt->can_queue;

    retval->sg_tablesize = tpnt->sg_tablesize;

    retval->cmd_per_lun = tpnt->cmd_per_lun;

    retval->unchecked_isa_dma = tpnt->unchecked_isa_dma;

    retval->use_clustering = tpnt->use_clustering;

    retval->select_queue_depths = NULL;

    if(!scsi_hostlist)

        scsi_hostlist = retval;

    else

    {

        shpnt = scsi_hostlist;

        while(shpnt->next) shpnt = shpnt->next;

        shpnt->next = retval;

    }

    return retval;

}

int

scsi_register_device(struct Scsi_Device_Template * sdpnt)

{

    if(sdpnt->next) panic("Device already registered");

    sdpnt->next = scsi_devicelist;

    scsi_devicelist = sdpnt;

    return 0;

}

unsigned int scsi_init()

{

    static int called = 0;

    int i, pcount;

    Scsi_Host_Template * tpnt;

    struct Scsi_Host * shpnt;

    const char * name;

    if(called) return 0;

    called = 1;

    for (tpnt = &builtin_scsi_hosts[0], i = 0; i < MAX_SCSI_HOSTS; ++i, tpnt++)

    {

        /*

         * Initialize our semaphores.  -1 is interpreted to mean

         * "inactive" - where as 0 will indicate a time out condition.

         */

        pcount = next_scsi_host;

        if ((tpnt->detect) &&

            (tpnt->present =

             tpnt->detect(tpnt)))

        {

            /* The only time this should come up is when people use

             * some kind of patched driver of some kind or another. */

            if(pcount == next_scsi_host) {

                if(tpnt->present > 1)

                    panic("Failure to register low-level scsi driver");

                /* The low-level driver failed to register a driver.  We

                 * can do this now. */

                scsi_register(tpnt,0);

            }

            tpnt->next = scsi_hosts;

            scsi_hosts = tpnt;

            /* Add the driver to /proc/scsi */

#if CONFIG_PROC_FS 

            build_proc_dir_entries(tpnt);

#endif

        }

    }

    for(shpnt=scsi_hostlist; shpnt; shpnt = shpnt->next)

    {

        if(shpnt->hostt->info)

            name = shpnt->hostt->info(shpnt);

        else

            name = shpnt->hostt->name;

        printk ("scsi%d : %s\n", /* And print a little message */

                shpnt->host_no, name);

    }

    printk ("scsi : %d host%s.\n", next_scsi_host,

            (next_scsi_host == 1) ? "" : "s");

    scsi_make_blocked_list();

    /* Now attach the high level drivers */

#ifdef CONFIG_BLK_DEV_SD

    scsi_register_device(&sd_template);

#endif

#ifdef CONFIG_BLK_DEV_SR

    scsi_register_device(&sr_template);

#endif

#ifdef CONFIG_CHR_DEV_ST

    scsi_register_device(&st_template);

#endif

#ifdef CONFIG_CHR_DEV_SG

    scsi_register_device(&sg_template);

#endif

#if 0      

    max_scsi_hosts = next_scsi_host;

#endif

    return 0;

}

/*

 * Overrides for Emacs so that we follow Linus's tabbing style.

 * Emacs will notice this stuff at the end of the file and automatically

 * adjust the settings for this buffer only.  This must remain at the end

 * of the file.

 * ---------------------------------------------------------------------------

 * Local variables:

 * c-indent-level: 4

 * c-brace-imaginary-offset: 0

 * c-brace-offset: -4

 * c-argdecl-indent: 4

 * c-label-offset: -4

 * c-continued-statement-offset: 4

 * c-continued-brace-offset: 0

 * indent-tabs-mode: nil

 * tab-width: 8

 * End:

 */