1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * dw-hdmi-i2s-audio.c
4  *
5  * Copyright (c) 2017 Renesas Solutions Corp.
6  * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
7  */
8 
9 #include <linux/dma-mapping.h>
10 #include <linux/module.h>
11 
12 #include <drm/bridge/dw_hdmi.h>
13 #include <drm/drm_crtc.h>
14 
15 #include <sound/hdmi-codec.h>
16 
17 #include "dw-hdmi.h"
18 #include "dw-hdmi-audio.h"
19 
20 #define DRIVER_NAME "dw-hdmi-i2s-audio"
21 
22 static inline void hdmi_write(struct dw_hdmi_i2s_audio_data *audio,
23 			      u8 val, int offset)
24 {
25 	struct dw_hdmi *hdmi = audio->hdmi;
26 
27 	audio->write(hdmi, val, offset);
28 }
29 
30 static inline u8 hdmi_read(struct dw_hdmi_i2s_audio_data *audio, int offset)
31 {
32 	struct dw_hdmi *hdmi = audio->hdmi;
33 
34 	return audio->read(hdmi, offset);
35 }
36 
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)
40 {
41 	struct dw_hdmi_i2s_audio_data *audio = data;
42 	struct dw_hdmi *hdmi = audio->hdmi;
43 	u8 conf0 = 0;
44 	u8 conf1 = 0;
45 	u8 inputclkfs = 0;
46 
47 	/* it cares I2S only */
48 	if (fmt->bit_clk_provider | fmt->frame_clk_provider) {
49 		dev_err(dev, "unsupported clock settings\n");
50 		return -EINVAL;
51 	}
52 
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);
56 
57 	inputclkfs	= HDMI_AUD_INPUTCLKFS_64FS;
58 	conf0		= (HDMI_AUD_CONF0_I2S_SELECT | HDMI_AUD_CONF0_I2S_EN0);
59 
60 	/* Enable the required i2s lanes */
61 	switch (hparms->channels) {
62 	case 7 ... 8:
63 		conf0 |= HDMI_AUD_CONF0_I2S_EN3;
64 		fallthrough;
65 	case 5 ... 6:
66 		conf0 |= HDMI_AUD_CONF0_I2S_EN2;
67 		fallthrough;
68 	case 3 ... 4:
69 		conf0 |= HDMI_AUD_CONF0_I2S_EN1;
70 		/* Fall-thru */
71 	}
72 
73 	switch (hparms->sample_width) {
74 	case 16:
75 		conf1 = HDMI_AUD_CONF1_WIDTH_16;
76 		break;
77 	case 24:
78 	case 32:
79 		conf1 = HDMI_AUD_CONF1_WIDTH_24;
80 		break;
81 	}
82 
83 	switch (fmt->fmt) {
84 	case HDMI_I2S:
85 		conf1 |= HDMI_AUD_CONF1_MODE_I2S;
86 		break;
87 	case HDMI_RIGHT_J:
88 		conf1 |= HDMI_AUD_CONF1_MODE_RIGHT_J;
89 		break;
90 	case HDMI_LEFT_J:
91 		conf1 |= HDMI_AUD_CONF1_MODE_LEFT_J;
92 		break;
93 	case HDMI_DSP_A:
94 		conf1 |= HDMI_AUD_CONF1_MODE_BURST_1;
95 		break;
96 	case HDMI_DSP_B:
97 		conf1 |= HDMI_AUD_CONF1_MODE_BURST_2;
98 		break;
99 	default:
100 		dev_err(dev, "unsupported format\n");
101 		return -EINVAL;
102 	}
103 
104 	dw_hdmi_set_sample_rate(hdmi, hparms->sample_rate);
105 	dw_hdmi_set_channel_status(hdmi, hparms->iec.status);
106 	dw_hdmi_set_channel_count(hdmi, hparms->channels);
107 	dw_hdmi_set_channel_allocation(hdmi, hparms->cea.channel_allocation);
108 
109 	hdmi_write(audio, inputclkfs, HDMI_AUD_INPUTCLKFS);
110 	hdmi_write(audio, conf0, HDMI_AUD_CONF0);
111 	hdmi_write(audio, conf1, HDMI_AUD_CONF1);
112 
113 	return 0;
114 }
115 
116 static int dw_hdmi_i2s_audio_startup(struct device *dev, void *data)
117 {
118 	struct dw_hdmi_i2s_audio_data *audio = data;
119 	struct dw_hdmi *hdmi = audio->hdmi;
120 
121 	dw_hdmi_audio_enable(hdmi);
122 
123 	return 0;
124 }
125 
126 static void dw_hdmi_i2s_audio_shutdown(struct device *dev, void *data)
127 {
128 	struct dw_hdmi_i2s_audio_data *audio = data;
129 	struct dw_hdmi *hdmi = audio->hdmi;
130 
131 	dw_hdmi_audio_disable(hdmi);
132 }
133 
134 static int dw_hdmi_i2s_get_eld(struct device *dev, void *data, uint8_t *buf,
135 			       size_t len)
136 {
137 	struct dw_hdmi_i2s_audio_data *audio = data;
138 	u8 *eld;
139 
140 	eld = audio->get_eld(audio->hdmi);
141 	if (eld)
142 		memcpy(buf, eld, min_t(size_t, MAX_ELD_BYTES, len));
143 	else
144 		/* Pass en empty ELD if connector not available */
145 		memset(buf, 0, len);
146 
147 	return 0;
148 }
149 
150 static int dw_hdmi_i2s_get_dai_id(struct snd_soc_component *component,
151 				  struct device_node *endpoint)
152 {
153 	struct of_endpoint of_ep;
154 	int ret;
155 
156 	ret = of_graph_parse_endpoint(endpoint, &of_ep);
157 	if (ret < 0)
158 		return ret;
159 
160 	/*
161 	 * HDMI sound should be located as reg = <2>
162 	 * Then, it is sound port 0
163 	 */
164 	if (of_ep.port == 2)
165 		return 0;
166 
167 	return -EINVAL;
168 }
169 
170 static int dw_hdmi_i2s_hook_plugged_cb(struct device *dev, void *data,
171 				       hdmi_codec_plugged_cb fn,
172 				       struct device *codec_dev)
173 {
174 	struct dw_hdmi_i2s_audio_data *audio = data;
175 	struct dw_hdmi *hdmi = audio->hdmi;
176 
177 	return dw_hdmi_set_plugged_cb(hdmi, fn, codec_dev);
178 }
179 
180 static const struct hdmi_codec_ops dw_hdmi_i2s_ops = {
181 	.hw_params	= dw_hdmi_i2s_hw_params,
182 	.audio_startup  = dw_hdmi_i2s_audio_startup,
183 	.audio_shutdown	= dw_hdmi_i2s_audio_shutdown,
184 	.get_eld	= dw_hdmi_i2s_get_eld,
185 	.get_dai_id	= dw_hdmi_i2s_get_dai_id,
186 	.hook_plugged_cb = dw_hdmi_i2s_hook_plugged_cb,
187 };
188 
189 static int snd_dw_hdmi_probe(struct platform_device *pdev)
190 {
191 	struct dw_hdmi_i2s_audio_data *audio = pdev->dev.platform_data;
192 	struct platform_device_info pdevinfo;
193 	struct hdmi_codec_pdata pdata;
194 	struct platform_device *platform;
195 
196 	pdata.ops		= &dw_hdmi_i2s_ops;
197 	pdata.i2s		= 1;
198 	pdata.max_i2s_channels	= 8;
199 	pdata.data		= audio;
200 
201 	memset(&pdevinfo, 0, sizeof(pdevinfo));
202 	pdevinfo.parent		= pdev->dev.parent;
203 	pdevinfo.id		= PLATFORM_DEVID_AUTO;
204 	pdevinfo.name		= HDMI_CODEC_DRV_NAME;
205 	pdevinfo.data		= &pdata;
206 	pdevinfo.size_data	= sizeof(pdata);
207 	pdevinfo.dma_mask	= DMA_BIT_MASK(32);
208 
209 	platform = platform_device_register_full(&pdevinfo);
210 	if (IS_ERR(platform))
211 		return PTR_ERR(platform);
212 
213 	dev_set_drvdata(&pdev->dev, platform);
214 
215 	return 0;
216 }
217 
218 static int snd_dw_hdmi_remove(struct platform_device *pdev)
219 {
220 	struct platform_device *platform = dev_get_drvdata(&pdev->dev);
221 
222 	platform_device_unregister(platform);
223 
224 	return 0;
225 }
226 
227 static struct platform_driver snd_dw_hdmi_driver = {
228 	.probe	= snd_dw_hdmi_probe,
229 	.remove	= snd_dw_hdmi_remove,
230 	.driver	= {
231 		.name = DRIVER_NAME,
232 	},
233 };
234 module_platform_driver(snd_dw_hdmi_driver);
235 
236 MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
237 MODULE_DESCRIPTION("Synopsis Designware HDMI I2S ALSA SoC interface");
238 MODULE_LICENSE("GPL v2");
239 MODULE_ALIAS("platform:" DRIVER_NAME);
240