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
42int 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