drivers/infiniband/hw/ehca/hcp_phyp.c

   1 /*
   2  *  IBM eServer eHCA Infiniband device driver for Linux on POWER
   3  *
   4  *   load store abstraction for ehca register access with tracing
   5  *
   6  *  Authors: Christoph Raisch <raisch@de.ibm.com>
   7  *           Hoang-Nam Nguyen <hnguyen@de.ibm.com>
   8  *
   9  *  Copyright (c) 2005 IBM Corporation
  10  *
  11  *  All rights reserved.
  12  *
  13  *  This source code is distributed under a dual license of GPL v2.0 and OpenIB
  14  *  BSD.
  15  *
  16  * OpenIB BSD License
  17  *
  18  * Redistribution and use in source and binary forms, with or without
  19  * modification, are permitted provided that the following conditions are met:
  20  *
  21  * Redistributions of source code must retain the above copyright notice, this
  22  * list of conditions and the following disclaimer.
  23  *
  24  * Redistributions in binary form must reproduce the above copyright notice,
  25  * this list of conditions and the following disclaimer in the documentation
  26  * and/or other materials
  27  * provided with the distribution.
  28  *
  29  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  30  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  31  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  32  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  33  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  34  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  35  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  36  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
  37  * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  38  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  39  * POSSIBILITY OF SUCH DAMAGE.
  40  */
  41
  42 #include "ehca_classes.h"
  43 #include "hipz_hw.h"
  44
  45 u64 hcall_map_page(u64 physaddr)
  46 {
  47         return (u64)ioremap(physaddr, EHCA_PAGESIZE);
  48 }
  49
  50 int hcall_unmap_page(u64 mapaddr)
  51 {
  52         iounmap((volatile void __iomem *) mapaddr);
  53         return 0;
  54 }
  55
  56 int hcp_galpas_ctor(struct h_galpas *galpas, int is_user,
  57                     u64 paddr_kernel, u64 paddr_user)
  58 {
  59         if (!is_user) {
  60                 galpas->kernel.fw_handle = hcall_map_page(paddr_kernel);
  61                 if (!galpas->kernel.fw_handle)
  62                         return -ENOMEM;
  63         } else
  64                 galpas->kernel.fw_handle = 0;
  65
  66         galpas->user.fw_handle = paddr_user;
  67
  68         return 0;
  69 }
  70
  71 int hcp_galpas_dtor(struct h_galpas *galpas)
  72 {
  73         if (galpas->kernel.fw_handle) {
  74                 int ret = hcall_unmap_page(galpas->kernel.fw_handle);
  75                 if (ret)
  76                         return ret;
  77         }
  78
  79         galpas->user.fw_handle = galpas->kernel.fw_handle = 0;
  80
  81         return 0;
  82 }