drivers/scsi/aacraid/rkt.c

   1 /*
   2  *      Adaptec AAC series RAID controller driver
   3  *      (c) Copyright 2001 Red Hat Inc. <alan@redhat.com>
   4  *
   5  * based on the old aacraid driver that is..
   6  * Adaptec aacraid device driver for Linux.
   7  *
   8  * Copyright (c) 2000-2007 Adaptec, Inc. (aacraid@adaptec.com)
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2, or (at your option)
  13  * any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; see the file COPYING.  If not, write to
  22  * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  23  *
  24  * Module Name:
  25  *  rkt.c
  26  *
  27  * Abstract: Hardware miniport for Drawbridge specific hardware functions.
  28  *
  29  */
  30
  31 #include <linux/blkdev.h>
  32
  33 #include <scsi/scsi_host.h>
  34
  35 #include "aacraid.h"
  36
  37 #define AAC_NUM_IO_FIB_RKT      (246 - AAC_NUM_MGT_FIB)
  38
  39 /**
  40  *      aac_rkt_select_comm     -       Select communications method
  41  *      @dev: Adapter
  42  *      @comm: communications method
  43  */
  44
  45 static int aac_rkt_select_comm(struct aac_dev *dev, int comm)
  46 {
  47         int retval;
  48         retval = aac_rx_select_comm(dev, comm);
  49         if (comm == AAC_COMM_MESSAGE) {
  50                 /*
  51                  * FIB Setup has already been done, but we can minimize the
  52                  * damage by at least ensuring the OS never issues more
  53                  * commands than we can handle. The Rocket adapters currently
  54                  * can only handle 246 commands and 8 AIFs at the same time,
  55                  * and in fact do notify us accordingly if we negotiate the
  56                  * FIB size. The problem that causes us to add this check is
  57                  * to ensure that we do not overdo it with the adapter when a
  58                  * hard coded FIB override is being utilized. This special
  59                  * case warrants this half baked, but convenient, check here.
  60                  */
  61                 if (dev->scsi_host_ptr->can_queue > AAC_NUM_IO_FIB_RKT) {
  62                         dev->init->MaxIoCommands =
  63                                 cpu_to_le32(AAC_NUM_IO_FIB_RKT + AAC_NUM_MGT_FIB);
  64                         dev->scsi_host_ptr->can_queue = AAC_NUM_IO_FIB_RKT;
  65                 }
  66         }
  67         return retval;
  68 }
  69
  70 /**
  71  *      aac_rkt_ioremap
  72  *      @size: mapping resize request
  73  *
  74  */
  75 static int aac_rkt_ioremap(struct aac_dev * dev, u32 size)
  76 {
  77         if (!size) {
  78                 iounmap(dev->regs.rkt);
  79                 return 0;
  80         }
  81         dev->base = dev->regs.rkt = ioremap(dev->scsi_host_ptr->base, size);
  82         if (dev->base == NULL)
  83                 return -1;
  84         dev->IndexRegs = &dev->regs.rkt->IndexRegs;
  85         return 0;
  86 }
  87
  88 /**
  89  *      aac_rkt_init    -       initialize an i960 based AAC card
  90  *      @dev: device to configure
  91  *
  92  *      Allocate and set up resources for the i960 based AAC variants. The
  93  *      device_interface in the commregion will be allocated and linked
  94  *      to the comm region.
  95  */
  96
  97 int aac_rkt_init(struct aac_dev *dev)
  98 {
  99         /*
 100          *      Fill in the function dispatch table.
 101          */
 102         dev->a_ops.adapter_ioremap = aac_rkt_ioremap;
 103         dev->a_ops.adapter_comm = aac_rkt_select_comm;
 104
 105         return _aac_rx_init(dev);
 106 }