LXR linux/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
  46static 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 */
  76static 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->base_start, 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
  98int 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}
 108