1// SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
2//
3// This file is provided under a dual BSD/GPLv2 license.  When using or
4// redistributing this file, you may do so under either license.
5//
6// Copyright(c) 2018 Intel Corporation. All rights reserved.
7//
8// Authors: Keyon Jie <yang.jie@linux.intel.com>
9
10#include <linux/io.h>
11#include <sound/hdaudio.h>
12#include <sound/hda_i915.h>
13#include <sound/hda_codec.h>
14#include <sound/hda_register.h>
15#include "../sof-priv.h"
16#include "hda.h"
17
18#if IS_ENABLED(CONFIG_SND_SOC_SOF_HDA_AUDIO_CODEC)
19#include "../../codecs/hdac_hda.h"
20#define sof_hda_ext_ops	snd_soc_hdac_hda_get_ops()
21
22static void update_codec_wake_enable(struct hdac_bus *bus, unsigned int addr, bool link_power)
23{
24	unsigned int mask = snd_hdac_chip_readw(bus, WAKEEN);
25
26	if (link_power)
27		mask &= ~BIT(addr);
28	else
29		mask |= BIT(addr);
30
31	snd_hdac_chip_updatew(bus, WAKEEN, STATESTS_INT_MASK, mask);
32}
33
34static void sof_hda_bus_link_power(struct hdac_device *codec, bool enable)
35{
36	struct hdac_bus *bus = codec->bus;
37	bool oldstate = test_bit(codec->addr, &bus->codec_powered);
38
39	snd_hdac_ext_bus_link_power(codec, enable);
40
41	if (enable == oldstate)
42		return;
43
44	/*
45	 * Both codec driver and controller can hold references to
46	 * display power. To avoid unnecessary power-up/down cycles,
47	 * controller doesn't immediately release its reference.
48	 *
49	 * If the codec driver powers down the link, release
50	 * the controller reference as well.
51	 */
52	if (codec->addr == HDA_IDISP_ADDR && !enable)
53		snd_hdac_display_power(bus, HDA_CODEC_IDX_CONTROLLER, false);
54
55	/* WAKEEN needs to be set for disabled links */
56	update_codec_wake_enable(bus, codec->addr, enable);
57}
58
59static const struct hdac_bus_ops bus_core_ops = {
60	.command = snd_hdac_bus_send_cmd,
61	.get_response = snd_hdac_bus_get_response,
62	.link_power = sof_hda_bus_link_power,
63};
64#endif
65
66/*
67 * This can be used for both with/without hda link support.
68 */
69void sof_hda_bus_init(struct snd_sof_dev *sdev, struct device *dev)
70{
71	struct hdac_bus *bus = sof_to_bus(sdev);
72
73#if IS_ENABLED(CONFIG_SND_SOC_SOF_HDA_LINK)
74#if IS_ENABLED(CONFIG_SND_SOC_SOF_HDA_AUDIO_CODEC)
75	snd_hdac_ext_bus_init(bus, dev, &bus_core_ops, sof_hda_ext_ops);
76#else
77	snd_hdac_ext_bus_init(bus, dev, NULL, NULL);
78#endif
79#else
80
81	memset(bus, 0, sizeof(*bus));
82	bus->dev = dev;
83
84	INIT_LIST_HEAD(&bus->stream_list);
85
86	bus->irq = -1;
87
88	/*
89	 * There is only one HDA bus atm. keep the index as 0.
90	 * Need to fix when there are more than one HDA bus.
91	 */
92	bus->idx = 0;
93
94	spin_lock_init(&bus->reg_lock);
95#endif /* CONFIG_SND_SOC_SOF_HDA_LINK */
96}
97
98void sof_hda_bus_exit(struct snd_sof_dev *sdev)
99{
100#if IS_ENABLED(CONFIG_SND_SOC_SOF_HDA_LINK)
101	struct hdac_bus *bus = sof_to_bus(sdev);
102
103	snd_hdac_ext_bus_exit(bus);
104#endif
105}
106