drivers/gpu/drm/amd/acp/acp_hw.c

   1 /*
   2  * Copyright 2015 Advanced Micro Devices, Inc.
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included in
  12  * all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  20  * OTHER DEALINGS IN THE SOFTWARE.
  21  *
  22  */
  23
  24 #include <linux/mm.h>
  25 #include <linux/slab.h>
  26 #include <linux/device.h>
  27 #include <linux/delay.h>
  28 #include <linux/errno.h>
  29
  30 #include "acp_gfx_if.h"
  31
  32 #define ACP_MODE_I2S    0
  33 #define ACP_MODE_AZ     1
  34
  35 #define mmACP_AZALIA_I2S_SELECT 0x51d4
  36
  37 int amd_acp_hw_init(struct cgs_device *cgs_device,
  38                     unsigned acp_version_major, unsigned acp_version_minor)
  39 {
  40         unsigned int acp_mode = ACP_MODE_I2S;
  41
  42         if ((acp_version_major == 2) && (acp_version_minor == 2))
  43                 acp_mode = cgs_read_register(cgs_device,
  44                                         mmACP_AZALIA_I2S_SELECT);
  45
  46         if (acp_mode != ACP_MODE_I2S)
  47                 return -ENODEV;
  48
  49         return 0;
  50 }