LXR linux/drivers/scsi/aacraid/rkt.c

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 *      Adaptec AAC series RAID controller driver
   4 *      (c) Copyright 2001 Red Hat Inc.
   5 *
   6 * based on the old aacraid driver that is..
   7 * Adaptec aacraid device driver for Linux.
   8 *
   9 * Copyright (c) 2000-2010 Adaptec, Inc.
  10 *               2010-2015 PMC-Sierra, Inc. (aacraid@pmc-sierra.com)
  11 *               2016-2017 Microsemi Corp. (aacraid@microsemi.com)
  12 *
  13 * Module Name:
  14 *  rkt.c
  15 *
  16 * Abstract: Hardware miniport for Drawbridge specific hardware functions.
  17 */
  18
  19#include <linux/blkdev.h>
  20
  21#include <scsi/scsi_host.h>
  22
  23#include "aacraid.h"
  24
  25#define AAC_NUM_IO_FIB_RKT      (246 - AAC_NUM_MGT_FIB)
  26
  27/**
  28 *      aac_rkt_select_comm     -       Select communications method
  29 *      @dev: Adapter
  30 *      @comm: communications method
  31 */
  32
  33static int aac_rkt_select_comm(struct aac_dev *dev, int comm)
  34{
  35        int retval;
  36        retval = aac_rx_select_comm(dev, comm);
  37        if (comm == AAC_COMM_MESSAGE) {
  38                /*
  39                 * FIB Setup has already been done, but we can minimize the
  40                 * damage by at least ensuring the OS never issues more
  41                 * commands than we can handle. The Rocket adapters currently
  42                 * can only handle 246 commands and 8 AIFs at the same time,
  43                 * and in fact do notify us accordingly if we negotiate the
  44                 * FIB size. The problem that causes us to add this check is
  45                 * to ensure that we do not overdo it with the adapter when a
  46                 * hard coded FIB override is being utilized. This special
  47                 * case warrants this half baked, but convenient, check here.
  48                 */
  49                if (dev->scsi_host_ptr->can_queue > AAC_NUM_IO_FIB_RKT) {
  50                        dev->init->r7.max_io_commands =
  51                                cpu_to_le32(AAC_NUM_IO_FIB_RKT + AAC_NUM_MGT_FIB);
  52                        dev->scsi_host_ptr->can_queue = AAC_NUM_IO_FIB_RKT;
  53                }
  54        }
  55        return retval;
  56}
  57
  58/**
  59 *      aac_rkt_ioremap
  60 *      @size: mapping resize request
  61 *
  62 */
  63static int aac_rkt_ioremap(struct aac_dev * dev, u32 size)
  64{
  65        if (!size) {
  66                iounmap(dev->regs.rkt);
  67                return 0;
  68        }
  69        dev->base = dev->regs.rkt = ioremap(dev->base_start, size);
  70        if (dev->base == NULL)
  71                return -1;
  72        dev->IndexRegs = &dev->regs.rkt->IndexRegs;
  73        return 0;
  74}
  75
  76/**
  77 *      aac_rkt_init    -       initialize an i960 based AAC card
  78 *      @dev: device to configure
  79 *
  80 *      Allocate and set up resources for the i960 based AAC variants. The 
  81 *      device_interface in the commregion will be allocated and linked 
  82 *      to the comm region.
  83 */
  84
  85int aac_rkt_init(struct aac_dev *dev)
  86{
  87        /*
  88         *      Fill in the function dispatch table.
  89         */
  90        dev->a_ops.adapter_ioremap = aac_rkt_ioremap;
  91        dev->a_ops.adapter_comm = aac_rkt_select_comm;
  92
  93        return _aac_rx_init(dev);
  94}
  95