xref: /openbmc/linux/drivers/gpu/drm/amd/acp/acp_hw.c (revision 110e6f26)
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 
amd_acp_hw_init(struct cgs_device * cgs_device,unsigned acp_version_major,unsigned acp_version_minor)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 }
51