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