1 // SPDX-License-Identifier: GPL-2.0
5 * Copyright (c) 2017 Renesas Solutions Corp.
6 * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
9 #include <linux/dma-mapping.h>
10 #include <linux/module.h>
12 #include <drm/bridge/dw_hdmi.h>
13 #include <drm/drm_crtc.h>
15 #include <sound/hdmi-codec.h>
18 #include "dw-hdmi-audio.h"
20 #define DRIVER_NAME "dw-hdmi-i2s-audio"
22 static inline void hdmi_write(struct dw_hdmi_i2s_audio_data *audio,
25 struct dw_hdmi *hdmi = audio->hdmi;
27 audio->write(hdmi, val, offset);
30 static inline u8 hdmi_read(struct dw_hdmi_i2s_audio_data *audio, int offset)
32 struct dw_hdmi *hdmi = audio->hdmi;
34 return audio->read(hdmi, offset);
37 static int dw_hdmi_i2s_hw_params(struct device *dev, void *data,
38 struct hdmi_codec_daifmt *fmt,
39 struct hdmi_codec_params *hparms)
41 struct dw_hdmi_i2s_audio_data *audio = data;
42 struct dw_hdmi *hdmi = audio->hdmi;
47 /* it cares I2S only */
48 if (fmt->bit_clk_master | fmt->frame_clk_master) {
49 dev_err(dev, "unsupported clock settings\n");
53 /* Reset the FIFOs before applying new params */
54 hdmi_write(audio, HDMI_AUD_CONF0_SW_RESET, HDMI_AUD_CONF0);
55 hdmi_write(audio, (u8)~HDMI_MC_SWRSTZ_I2SSWRST_REQ, HDMI_MC_SWRSTZ);
57 inputclkfs = HDMI_AUD_INPUTCLKFS_64FS;
58 conf0 = (HDMI_AUD_CONF0_I2S_SELECT | HDMI_AUD_CONF0_I2S_EN0);
60 /* Enable the required i2s lanes */
61 switch (hparms->channels) {
63 conf0 |= HDMI_AUD_CONF0_I2S_EN3;
66 conf0 |= HDMI_AUD_CONF0_I2S_EN2;
69 conf0 |= HDMI_AUD_CONF0_I2S_EN1;
73 switch (hparms->sample_width) {
75 conf1 = HDMI_AUD_CONF1_WIDTH_16;
79 conf1 = HDMI_AUD_CONF1_WIDTH_24;
85 conf1 |= HDMI_AUD_CONF1_MODE_I2S;
88 conf1 |= HDMI_AUD_CONF1_MODE_RIGHT_J;
91 conf1 |= HDMI_AUD_CONF1_MODE_LEFT_J;
94 conf1 |= HDMI_AUD_CONF1_MODE_BURST_1;
97 conf1 |= HDMI_AUD_CONF1_MODE_BURST_2;
100 dev_err(dev, "unsupported format\n");
104 dw_hdmi_set_sample_rate(hdmi, hparms->sample_rate);
105 dw_hdmi_set_channel_count(hdmi, hparms->channels);
106 dw_hdmi_set_channel_allocation(hdmi, hparms->cea.channel_allocation);
108 hdmi_write(audio, inputclkfs, HDMI_AUD_INPUTCLKFS);
109 hdmi_write(audio, conf0, HDMI_AUD_CONF0);
110 hdmi_write(audio, conf1, HDMI_AUD_CONF1);
112 dw_hdmi_audio_enable(hdmi);
117 static void dw_hdmi_i2s_audio_shutdown(struct device *dev, void *data)
119 struct dw_hdmi_i2s_audio_data *audio = data;
120 struct dw_hdmi *hdmi = audio->hdmi;
122 dw_hdmi_audio_disable(hdmi);
125 static int dw_hdmi_i2s_get_eld(struct device *dev, void *data, uint8_t *buf,
128 struct dw_hdmi_i2s_audio_data *audio = data;
130 memcpy(buf, audio->eld, min_t(size_t, MAX_ELD_BYTES, len));
134 static int dw_hdmi_i2s_get_dai_id(struct snd_soc_component *component,
135 struct device_node *endpoint)
137 struct of_endpoint of_ep;
140 ret = of_graph_parse_endpoint(endpoint, &of_ep);
145 * HDMI sound should be located as reg = <2>
146 * Then, it is sound port 0
154 static struct hdmi_codec_ops dw_hdmi_i2s_ops = {
155 .hw_params = dw_hdmi_i2s_hw_params,
156 .audio_shutdown = dw_hdmi_i2s_audio_shutdown,
157 .get_eld = dw_hdmi_i2s_get_eld,
158 .get_dai_id = dw_hdmi_i2s_get_dai_id,
161 static int snd_dw_hdmi_probe(struct platform_device *pdev)
163 struct dw_hdmi_i2s_audio_data *audio = pdev->dev.platform_data;
164 struct platform_device_info pdevinfo;
165 struct hdmi_codec_pdata pdata;
166 struct platform_device *platform;
168 pdata.ops = &dw_hdmi_i2s_ops;
170 pdata.max_i2s_channels = 8;
173 memset(&pdevinfo, 0, sizeof(pdevinfo));
174 pdevinfo.parent = pdev->dev.parent;
175 pdevinfo.id = PLATFORM_DEVID_AUTO;
176 pdevinfo.name = HDMI_CODEC_DRV_NAME;
177 pdevinfo.data = &pdata;
178 pdevinfo.size_data = sizeof(pdata);
179 pdevinfo.dma_mask = DMA_BIT_MASK(32);
181 platform = platform_device_register_full(&pdevinfo);
182 if (IS_ERR(platform))
183 return PTR_ERR(platform);
185 dev_set_drvdata(&pdev->dev, platform);
190 static int snd_dw_hdmi_remove(struct platform_device *pdev)
192 struct platform_device *platform = dev_get_drvdata(&pdev->dev);
194 platform_device_unregister(platform);
199 static struct platform_driver snd_dw_hdmi_driver = {
200 .probe = snd_dw_hdmi_probe,
201 .remove = snd_dw_hdmi_remove,
206 module_platform_driver(snd_dw_hdmi_driver);
208 MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
209 MODULE_DESCRIPTION("Synopsis Designware HDMI I2S ALSA SoC interface");
210 MODULE_LICENSE("GPL v2");
211 MODULE_ALIAS("platform:" DRIVER_NAME);