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 }