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
  33 static 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  */
  63 static 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
  85 int 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 }