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
hdmi_write(struct dw_hdmi_i2s_audio_data * audio,u8 val,int offset)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
hdmi_read(struct dw_hdmi_i2s_audio_data * audio,int offset)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
dw_hdmi_i2s_hw_params(struct device * dev,void * data,struct hdmi_codec_daifmt * fmt,struct hdmi_codec_params * hparms)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
dw_hdmi_i2s_audio_startup(struct device * dev,void * data)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
dw_hdmi_i2s_audio_shutdown(struct device * dev,void * data)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
dw_hdmi_i2s_get_eld(struct device * dev,void * data,uint8_t * buf,size_t len)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
dw_hdmi_i2s_get_dai_id(struct snd_soc_component * component,struct device_node * endpoint)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
dw_hdmi_i2s_hook_plugged_cb(struct device * dev,void * data,hdmi_codec_plugged_cb fn,struct device * codec_dev)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
snd_dw_hdmi_probe(struct platform_device * pdev)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 memset(&pdata, 0, sizeof(pdata));
197 pdata.ops = &dw_hdmi_i2s_ops;
198 pdata.i2s = 1;
199 pdata.max_i2s_channels = 8;
200 pdata.data = audio;
201
202 memset(&pdevinfo, 0, sizeof(pdevinfo));
203 pdevinfo.parent = pdev->dev.parent;
204 pdevinfo.id = PLATFORM_DEVID_AUTO;
205 pdevinfo.name = HDMI_CODEC_DRV_NAME;
206 pdevinfo.data = &pdata;
207 pdevinfo.size_data = sizeof(pdata);
208 pdevinfo.dma_mask = DMA_BIT_MASK(32);
209
210 platform = platform_device_register_full(&pdevinfo);
211 if (IS_ERR(platform))
212 return PTR_ERR(platform);
213
214 dev_set_drvdata(&pdev->dev, platform);
215
216 return 0;
217 }
218
snd_dw_hdmi_remove(struct platform_device * pdev)219 static void snd_dw_hdmi_remove(struct platform_device *pdev)
220 {
221 struct platform_device *platform = dev_get_drvdata(&pdev->dev);
222
223 platform_device_unregister(platform);
224 }
225
226 static struct platform_driver snd_dw_hdmi_driver = {
227 .probe = snd_dw_hdmi_probe,
228 .remove_new = snd_dw_hdmi_remove,
229 .driver = {
230 .name = DRIVER_NAME,
231 },
232 };
233 module_platform_driver(snd_dw_hdmi_driver);
234
235 MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
236 MODULE_DESCRIPTION("Synopsis Designware HDMI I2S ALSA SoC interface");
237 MODULE_LICENSE("GPL v2");
238 MODULE_ALIAS("platform:" DRIVER_NAME);
239