amd/acp/acp_hw.c

0001 /*
0002  * Copyright 2015 Advanced Micro Devices, Inc.
0003  *
0004  * Permission is hereby granted, free of charge, to any person obtaining a
0005  * copy of this software and associated documentation files (the "Software"),
0006  * to deal in the Software without restriction, including without limitation
0007  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
0008  * and/or sell copies of the Software, and to permit persons to whom the
0009  * Software is furnished to do so, subject to the following conditions:
0010  *
0011  * The above copyright notice and this permission notice shall be included in
0012  * all copies or substantial portions of the Software.
0013  *
0014  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
0015  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
0016  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
0017  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
0018  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
0019  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
0020  * OTHER DEALINGS IN THE SOFTWARE.
0021  *
0022  */
0023
0024 #include <linux/mm.h>
0025 #include <linux/slab.h>
0026 #include <linux/device.h>
0027 #include <linux/delay.h>
0028 #include <linux/errno.h>
0029
0030 #include "acp_gfx_if.h"
0031
0032 #define ACP_MODE_I2S    0
0033 #define ACP_MODE_AZ 1
0034
0035 #define mmACP_AZALIA_I2S_SELECT 0x51d4
0036
0037 int amd_acp_hw_init(struct cgs_device *cgs_device,
0038             unsigned acp_version_major, unsigned acp_version_minor)
0039 {
0040     unsigned int acp_mode = ACP_MODE_I2S;
0041
0042     if ((acp_version_major == 2) && (acp_version_minor == 2))
0043         acp_mode = cgs_read_register(cgs_device,
0044                     mmACP_AZALIA_I2S_SELECT);
0045
0046     if (acp_mode != ACP_MODE_I2S)
0047         return -ENODEV;
0048
0049     return 0;
0050 }