rkt.c

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/*
 *  Adaptec AAC series RAID controller driver
 *  (c) Copyright 2001 Red Hat Inc.
 *
 * based on the old aacraid driver that is..
 * Adaptec aacraid device driver for Linux.
 *
 * Copyright (c) 2000-2010 Adaptec, Inc.
 *               2010 PMC-Sierra, Inc. ([email protected])
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; see the file COPYING.  If not, write to
 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * Module Name:
 *  rkt.c
 *
 * Abstract: Hardware miniport for Drawbridge specific hardware functions.
 *
 */

#include <linux/blkdev.h>

#include <scsi/scsi_host.h>

#include "aacraid.h"

#define AAC_NUM_IO_FIB_RKT      (246 - AAC_NUM_MGT_FIB)

static int aac_rkt_select_comm(struct aac_dev *dev, int comm)
{
    int retval;
    retval = aac_rx_select_comm(dev, comm);
    if (comm == AAC_COMM_MESSAGE) {
        /*
         * FIB Setup has already been done, but we can minimize the
         * damage by at least ensuring the OS never issues more
         * commands than we can handle. The Rocket adapters currently
         * can only handle 246 commands and 8 AIFs at the same time,
         * and in fact do notify us accordingly if we negotiate the
         * FIB size. The problem that causes us to add this check is
         * to ensure that we do not overdo it with the adapter when a
         * hard coded FIB override is being utilized. This special
         * case warrants this half baked, but convenient, check here.
         */
        if (dev->scsi_host_ptr->can_queue > AAC_NUM_IO_FIB_RKT) {
            dev->init->MaxIoCommands =
                cpu_to_le32(AAC_NUM_IO_FIB_RKT + AAC_NUM_MGT_FIB);
            dev->scsi_host_ptr->can_queue = AAC_NUM_IO_FIB_RKT;
        }
    }
    return retval;
}

static int aac_rkt_ioremap(struct aac_dev * dev, u32 size)
{
    if (!size) {
        iounmap(dev->regs.rkt);
        return 0;
    }
    dev->base = dev->regs.rkt = ioremap(dev->base_start, size);
    if (dev->base == NULL)
        return -1;
    dev->IndexRegs = &dev->regs.rkt->IndexRegs;
    return 0;
}

int aac_rkt_init(struct aac_dev *dev)
{
    /*
     *  Fill in the function dispatch table.
     */
    dev->a_ops.adapter_ioremap = aac_rkt_ioremap;
    dev->a_ops.adapter_comm = aac_rkt_select_comm;

    return _aac_rx_init(dev);
}