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      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 
     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