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  *               2010-2015 PMC-Sierra, Inc. (aacraid@pmc-sierra.com)
  10  *               2016-2017 Microsemi Corp. (aacraid@microsemi.com)
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2, or (at your option)
  15  * any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; see the file COPYING.  If not, write to
  24  * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  25  *
  26  * Module Name:
  27  *  rkt.c
  28  *
  29  * Abstract: Hardware miniport for Drawbridge specific hardware functions.
  30  *
  31  */
  32
  33 #include <linux/blkdev.h>
  34
  35 #include <scsi/scsi_host.h>
  36
  37 #include "aacraid.h"
  38
  39 #define AAC_NUM_IO_FIB_RKT      (246 - AAC_NUM_MGT_FIB)
  40
  41 /**
  42  *      aac_rkt_select_comm     -       Select communications method
  43  *      @dev: Adapter
  44  *      @comm: communications method
  45  */
  46
  47 static int aac_rkt_select_comm(struct aac_dev *dev, int comm)
  48 {
  49         int retval;
  50         retval = aac_rx_select_comm(dev, comm);
  51         if (comm == AAC_COMM_MESSAGE) {
  52                 /*
  53                  * FIB Setup has already been done, but we can minimize the
  54                  * damage by at least ensuring the OS never issues more
  55                  * commands than we can handle. The Rocket adapters currently
  56                  * can only handle 246 commands and 8 AIFs at the same time,
  57                  * and in fact do notify us accordingly if we negotiate the
  58                  * FIB size. The problem that causes us to add this check is
  59                  * to ensure that we do not overdo it with the adapter when a
  60                  * hard coded FIB override is being utilized. This special
  61                  * case warrants this half baked, but convenient, check here.
  62                  */
  63                 if (dev->scsi_host_ptr->can_queue > AAC_NUM_IO_FIB_RKT) {
  64                         dev->init->r7.max_io_commands =
  65                                 cpu_to_le32(AAC_NUM_IO_FIB_RKT + AAC_NUM_MGT_FIB);
  66                         dev->scsi_host_ptr->can_queue = AAC_NUM_IO_FIB_RKT;
  67                 }
  68         }
  69         return retval;
  70 }
  71
  72 /**
  73  *      aac_rkt_ioremap
  74  *      @size: mapping resize request
  75  *
  76  */
  77 static int aac_rkt_ioremap(struct aac_dev * dev, u32 size)
  78 {
  79         if (!size) {
  80                 iounmap(dev->regs.rkt);
  81                 return 0;
  82         }
  83         dev->base = dev->regs.rkt = ioremap(dev->base_start, size);
  84         if (dev->base == NULL)
  85                 return -1;
  86         dev->IndexRegs = &dev->regs.rkt->IndexRegs;
  87         return 0;
  88 }
  89
  90 /**
  91  *      aac_rkt_init    -       initialize an i960 based AAC card
  92  *      @dev: device to configure
  93  *
  94  *      Allocate and set up resources for the i960 based AAC variants. The
  95  *      device_interface in the commregion will be allocated and linked
  96  *      to the comm region.
  97  */
  98
  99 int aac_rkt_init(struct aac_dev *dev)
 100 {
 101         /*
 102          *      Fill in the function dispatch table.
 103          */
 104         dev->a_ops.adapter_ioremap = aac_rkt_ioremap;
 105         dev->a_ops.adapter_comm = aac_rkt_select_comm;
 106
 107         return _aac_rx_init(dev);
 108 }