1 /* $NetBSD: amdgpu_acp_hw.c,v 1.2 2021/12/18 23:44:57 riastradh Exp $ */
2
3 /*
4 * Copyright 2015 Advanced Micro Devices, Inc.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22 * OTHER DEALINGS IN THE SOFTWARE.
23 *
24 */
25
26 #include <sys/cdefs.h>
27 __KERNEL_RCSID(0, "$NetBSD: amdgpu_acp_hw.c,v 1.2 2021/12/18 23:44:57 riastradh Exp $");
28
29 #include <linux/mm.h>
30 #include <linux/slab.h>
31 #include <linux/device.h>
32 #include <linux/delay.h>
33 #include <linux/errno.h>
34
35 #include "acp_gfx_if.h"
36
37 #define ACP_MODE_I2S 0
38 #define ACP_MODE_AZ 1
39
40 #define mmACP_AZALIA_I2S_SELECT 0x51d4
41
amd_acp_hw_init(struct cgs_device * cgs_device,unsigned acp_version_major,unsigned acp_version_minor)42 int amd_acp_hw_init(struct cgs_device *cgs_device,
43 unsigned acp_version_major, unsigned acp_version_minor)
44 {
45 unsigned int acp_mode = ACP_MODE_I2S;
46
47 if ((acp_version_major == 2) && (acp_version_minor == 2))
48 acp_mode = cgs_read_register(cgs_device,
49 mmACP_AZALIA_I2S_SELECT);
50
51 if (acp_mode != ACP_MODE_I2S)
52 return -ENODEV;
53
54 return 0;
55 }
56