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 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 /**
  38  *      aac_rkt_ioremap
  39  *      @size: mapping resize request
  40  *
  41  */
  42 static int aac_rkt_ioremap(struct aac_dev * dev, u32 size)
  43 {
  44         if (!size) {
  45                 iounmap(dev->regs.rkt);
  46                 return 0;
  47         }
  48         dev->base = dev->regs.rkt = ioremap(dev->scsi_host_ptr->base, size);
  49         if (dev->base == NULL)
  50                 return -1;
  51         dev->IndexRegs = &dev->regs.rkt->IndexRegs;
  52         return 0;
  53 }
  54
  55 /**
  56  *      aac_rkt_init    -       initialize an i960 based AAC card
  57  *      @dev: device to configure
  58  *
  59  *      Allocate and set up resources for the i960 based AAC variants. The
  60  *      device_interface in the commregion will be allocated and linked
  61  *      to the comm region.
  62  */
  63
  64 int aac_rkt_init(struct aac_dev *dev)
  65 {
  66         int retval;
  67         extern int _aac_rx_init(struct aac_dev *dev);
  68         extern void aac_rx_start_adapter(struct aac_dev *dev);
  69
  70         /*
  71          *      Fill in the function dispatch table.
  72          */
  73         dev->a_ops.adapter_ioremap = aac_rkt_ioremap;
  74
  75         retval = _aac_rx_init(dev);
  76         if (retval)
  77                 return retval;
  78         if (dev->new_comm_interface) {
  79                 /*
  80                  * FIB Setup has already been done, but we can minimize the
  81                  * damage by at least ensuring the OS never issues more
  82                  * commands than we can handle. The Rocket adapters currently
  83                  * can only handle 246 commands and 8 AIFs at the same time,
  84                  * and in fact do notify us accordingly if we negotiate the
  85                  * FIB size. The problem that causes us to add this check is
  86                  * to ensure that we do not overdo it with the adapter when a
  87                  * hard coded FIB override is being utilized. This special
  88                  * case warrants this half baked, but convenient, check here.
  89                  */
  90                 if (dev->scsi_host_ptr->can_queue > (246 - AAC_NUM_MGT_FIB)) {
  91                         dev->init->MaxIoCommands = cpu_to_le32(246);
  92                         dev->scsi_host_ptr->can_queue = 246 - AAC_NUM_MGT_FIB;
  93                 }
  94         }
  95         /*
  96          *      Tell the adapter that all is configured, and it can start
  97          *      accepting requests
  98          */
  99         aac_rx_start_adapter(dev);
 100         return 0;
 101 }