drivers/scsi/aacraid/rkt.c

   1 /*
   2  *      Adaptec AAC series RAID controller driver
   3  *      (c) Copyright 2001 Red Hat Inc.
   4  *
   5  * based on the old aacraid driver that is..
   6  * Adaptec aacraid device driver for Linux.
   7  *
   8  * Copyright (c) 2000-2010 Adaptec, Inc.
   9  *               2010 PMC-Sierra, Inc. (aacraid@pmc-sierra.com)
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2, or (at your option)
  14  * any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; see the file COPYING.  If not, write to
  23  * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  24  *
  25  * Module Name:
  26  *  rkt.c
  27  *
  28  * Abstract: Hardware miniport for Drawbridge specific hardware functions.
  29  *
  30  */
  31
  32 #include <linux/blkdev.h>
  33
  34 #include <scsi/scsi_host.h>
  35
  36 #include "aacraid.h"
  37
  38 #define AAC_NUM_IO_FIB_RKT      (246 - AAC_NUM_MGT_FIB)
  39
  40 /**
  41  *      aac_rkt_select_comm     -       Select communications method
  42  *      @dev: Adapter
  43  *      @comm: communications method
  44  */
  45
  46 static int aac_rkt_select_comm(struct aac_dev *dev, int comm)
  47 {
  48         int retval;
  49         retval = aac_rx_select_comm(dev, comm);
  50         if (comm == AAC_COMM_MESSAGE) {
  51                 /*
  52                  * FIB Setup has already been done, but we can minimize the
  53                  * damage by at least ensuring the OS never issues more
  54                  * commands than we can handle. The Rocket adapters currently
  55                  * can only handle 246 commands and 8 AIFs at the same time,
  56                  * and in fact do notify us accordingly if we negotiate the
  57                  * FIB size. The problem that causes us to add this check is
  58                  * to ensure that we do not overdo it with the adapter when a
  59                  * hard coded FIB override is being utilized. This special
  60                  * case warrants this half baked, but convenient, check here.
  61                  */
  62                 if (dev->scsi_host_ptr->can_queue > AAC_NUM_IO_FIB_RKT) {
  63                         dev->init->MaxIoCommands =
  64                                 cpu_to_le32(AAC_NUM_IO_FIB_RKT + AAC_NUM_MGT_FIB);
  65                         dev->scsi_host_ptr->can_queue = AAC_NUM_IO_FIB_RKT;
  66                 }
  67         }
  68         return retval;
  69 }
  70
  71 /**
  72  *      aac_rkt_ioremap
  73  *      @size: mapping resize request
  74  *
  75  */
  76 static int aac_rkt_ioremap(struct aac_dev * dev, u32 size)
  77 {
  78         if (!size) {
  79                 iounmap(dev->regs.rkt);
  80                 return 0;
  81         }
  82         dev->base = dev->regs.rkt = ioremap(dev->scsi_host_ptr->base, size);
  83         if (dev->base == NULL)
  84                 return -1;
  85         dev->IndexRegs = &dev->regs.rkt->IndexRegs;
  86         return 0;
  87 }
  88
  89 /**
  90  *      aac_rkt_init    -       initialize an i960 based AAC card
  91  *      @dev: device to configure
  92  *
  93  *      Allocate and set up resources for the i960 based AAC variants. The
  94  *      device_interface in the commregion will be allocated and linked
  95  *      to the comm region.
  96  */
  97
  98 int aac_rkt_init(struct aac_dev *dev)
  99 {
 100         /*
 101          *      Fill in the function dispatch table.
 102          */
 103         dev->a_ops.adapter_ioremap = aac_rkt_ioremap;
 104         dev->a_ops.adapter_comm = aac_rkt_select_comm;
 105
 106         return _aac_rx_init(dev);
 107 }