1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * ASoC driver for TI DAVINCI EVM platform
4 *
5 * Author:      Vladimir Barinov, <vbarinov@embeddedalley.com>
6 * Copyright:   (C) 2007 MontaVista Software, Inc., <source@mvista.com>
7 */
8
9#include <linux/module.h>
10#include <linux/moduleparam.h>
11#include <linux/timer.h>
12#include <linux/interrupt.h>
13#include <linux/platform_device.h>
14#include <linux/i2c.h>
15#include <linux/of_platform.h>
16#include <linux/clk.h>
17#include <sound/core.h>
18#include <sound/pcm.h>
19#include <sound/soc.h>
20
21#include <asm/dma.h>
22#include <asm/mach-types.h>
23
24struct snd_soc_card_drvdata_davinci {
25	struct clk *mclk;
26	unsigned sysclk;
27};
28
29static int evm_startup(struct snd_pcm_substream *substream)
30{
31	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
32	struct snd_soc_card *soc_card = rtd->card;
33	struct snd_soc_card_drvdata_davinci *drvdata =
34		snd_soc_card_get_drvdata(soc_card);
35
36	if (drvdata->mclk)
37		return clk_prepare_enable(drvdata->mclk);
38
39	return 0;
40}
41
42static void evm_shutdown(struct snd_pcm_substream *substream)
43{
44	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
45	struct snd_soc_card *soc_card = rtd->card;
46	struct snd_soc_card_drvdata_davinci *drvdata =
47		snd_soc_card_get_drvdata(soc_card);
48
49	clk_disable_unprepare(drvdata->mclk);
50}
51
52static int evm_hw_params(struct snd_pcm_substream *substream,
53			 struct snd_pcm_hw_params *params)
54{
55	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
56	struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
57	struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
58	struct snd_soc_card *soc_card = rtd->card;
59	int ret = 0;
60	unsigned sysclk = ((struct snd_soc_card_drvdata_davinci *)
61			   snd_soc_card_get_drvdata(soc_card))->sysclk;
62
63	/* set the codec system clock */
64	ret = snd_soc_dai_set_sysclk(codec_dai, 0, sysclk, SND_SOC_CLOCK_OUT);
65	if (ret < 0)
66		return ret;
67
68	/* set the CPU system clock */
69	ret = snd_soc_dai_set_sysclk(cpu_dai, 0, sysclk, SND_SOC_CLOCK_OUT);
70	if (ret < 0 && ret != -ENOTSUPP)
71		return ret;
72
73	return 0;
74}
75
76static const struct snd_soc_ops evm_ops = {
77	.startup = evm_startup,
78	.shutdown = evm_shutdown,
79	.hw_params = evm_hw_params,
80};
81
82/* davinci-evm machine dapm widgets */
83static const struct snd_soc_dapm_widget aic3x_dapm_widgets[] = {
84	SND_SOC_DAPM_HP("Headphone Jack", NULL),
85	SND_SOC_DAPM_LINE("Line Out", NULL),
86	SND_SOC_DAPM_MIC("Mic Jack", NULL),
87	SND_SOC_DAPM_LINE("Line In", NULL),
88};
89
90/* davinci-evm machine audio_mapnections to the codec pins */
91static const struct snd_soc_dapm_route audio_map[] = {
92	/* Headphone connected to HPLOUT, HPROUT */
93	{"Headphone Jack", NULL, "HPLOUT"},
94	{"Headphone Jack", NULL, "HPROUT"},
95
96	/* Line Out connected to LLOUT, RLOUT */
97	{"Line Out", NULL, "LLOUT"},
98	{"Line Out", NULL, "RLOUT"},
99
100	/* Mic connected to (MIC3L | MIC3R) */
101	{"MIC3L", NULL, "Mic Bias"},
102	{"MIC3R", NULL, "Mic Bias"},
103	{"Mic Bias", NULL, "Mic Jack"},
104
105	/* Line In connected to (LINE1L | LINE2L), (LINE1R | LINE2R) */
106	{"LINE1L", NULL, "Line In"},
107	{"LINE2L", NULL, "Line In"},
108	{"LINE1R", NULL, "Line In"},
109	{"LINE2R", NULL, "Line In"},
110};
111
112/* Logic for a aic3x as connected on a davinci-evm */
113static int evm_aic3x_init(struct snd_soc_pcm_runtime *rtd)
114{
115	struct snd_soc_card *card = rtd->card;
116	struct device_node *np = card->dev->of_node;
117	int ret;
118
119	/* Add davinci-evm specific widgets */
120	snd_soc_dapm_new_controls(&card->dapm, aic3x_dapm_widgets,
121				  ARRAY_SIZE(aic3x_dapm_widgets));
122
123	if (np) {
124		ret = snd_soc_of_parse_audio_routing(card, "ti,audio-routing");
125		if (ret)
126			return ret;
127	} else {
128		/* Set up davinci-evm specific audio path audio_map */
129		snd_soc_dapm_add_routes(&card->dapm, audio_map,
130					ARRAY_SIZE(audio_map));
131	}
132
133	/* not connected */
134	snd_soc_dapm_nc_pin(&card->dapm, "MONO_LOUT");
135	snd_soc_dapm_nc_pin(&card->dapm, "HPLCOM");
136	snd_soc_dapm_nc_pin(&card->dapm, "HPRCOM");
137
138	return 0;
139}
140
141/*
142 * The struct is used as place holder. It will be completely
143 * filled with data from dt node.
144 */
145SND_SOC_DAILINK_DEFS(evm,
146	DAILINK_COMP_ARRAY(COMP_EMPTY()),
147	DAILINK_COMP_ARRAY(COMP_CODEC(NULL, "tlv320aic3x-hifi")),
148	DAILINK_COMP_ARRAY(COMP_EMPTY()));
149
150static struct snd_soc_dai_link evm_dai_tlv320aic3x = {
151	.name		= "TLV320AIC3X",
152	.stream_name	= "AIC3X",
153	.ops            = &evm_ops,
154	.init           = evm_aic3x_init,
155	.dai_fmt = SND_SOC_DAIFMT_DSP_B | SND_SOC_DAIFMT_CBM_CFM |
156		   SND_SOC_DAIFMT_IB_NF,
157	SND_SOC_DAILINK_REG(evm),
158};
159
160static const struct of_device_id davinci_evm_dt_ids[] = {
161	{
162		.compatible = "ti,da830-evm-audio",
163		.data = (void *) &evm_dai_tlv320aic3x,
164	},
165	{ /* sentinel */ }
166};
167MODULE_DEVICE_TABLE(of, davinci_evm_dt_ids);
168
169/* davinci evm audio machine driver */
170static struct snd_soc_card evm_soc_card = {
171	.owner = THIS_MODULE,
172	.num_links = 1,
173};
174
175static int davinci_evm_probe(struct platform_device *pdev)
176{
177	struct device_node *np = pdev->dev.of_node;
178	const struct of_device_id *match;
179	struct snd_soc_dai_link *dai;
180	struct snd_soc_card_drvdata_davinci *drvdata = NULL;
181	struct clk *mclk;
182	int ret = 0;
183
184	match = of_match_device(of_match_ptr(davinci_evm_dt_ids), &pdev->dev);
185	if (!match) {
186		dev_err(&pdev->dev, "Error: No device match found\n");
187		return -ENODEV;
188	}
189
190	dai = (struct snd_soc_dai_link *) match->data;
191
192	evm_soc_card.dai_link = dai;
193
194	dai->codecs->of_node = of_parse_phandle(np, "ti,audio-codec", 0);
195	if (!dai->codecs->of_node)
196		return -EINVAL;
197
198	dai->cpus->of_node = of_parse_phandle(np, "ti,mcasp-controller", 0);
199	if (!dai->cpus->of_node)
200		return -EINVAL;
201
202	dai->platforms->of_node = dai->cpus->of_node;
203
204	evm_soc_card.dev = &pdev->dev;
205	ret = snd_soc_of_parse_card_name(&evm_soc_card, "ti,model");
206	if (ret)
207		return ret;
208
209	mclk = devm_clk_get(&pdev->dev, "mclk");
210	if (PTR_ERR(mclk) == -EPROBE_DEFER) {
211		return -EPROBE_DEFER;
212	} else if (IS_ERR(mclk)) {
213		dev_dbg(&pdev->dev, "mclk not found.\n");
214		mclk = NULL;
215	}
216
217	drvdata = devm_kzalloc(&pdev->dev, sizeof(*drvdata), GFP_KERNEL);
218	if (!drvdata)
219		return -ENOMEM;
220
221	drvdata->mclk = mclk;
222
223	ret = of_property_read_u32(np, "ti,codec-clock-rate", &drvdata->sysclk);
224
225	if (ret < 0) {
226		if (!drvdata->mclk) {
227			dev_err(&pdev->dev,
228				"No clock or clock rate defined.\n");
229			return -EINVAL;
230		}
231		drvdata->sysclk = clk_get_rate(drvdata->mclk);
232	} else if (drvdata->mclk) {
233		unsigned int requestd_rate = drvdata->sysclk;
234		clk_set_rate(drvdata->mclk, drvdata->sysclk);
235		drvdata->sysclk = clk_get_rate(drvdata->mclk);
236		if (drvdata->sysclk != requestd_rate)
237			dev_warn(&pdev->dev,
238				 "Could not get requested rate %u using %u.\n",
239				 requestd_rate, drvdata->sysclk);
240	}
241
242	snd_soc_card_set_drvdata(&evm_soc_card, drvdata);
243	ret = devm_snd_soc_register_card(&pdev->dev, &evm_soc_card);
244
245	if (ret)
246		dev_err(&pdev->dev, "snd_soc_register_card failed (%d)\n", ret);
247
248	return ret;
249}
250
251static struct platform_driver davinci_evm_driver = {
252	.probe		= davinci_evm_probe,
253	.driver		= {
254		.name	= "davinci_evm",
255		.pm	= &snd_soc_pm_ops,
256		.of_match_table = davinci_evm_dt_ids,
257	},
258};
259
260module_platform_driver(davinci_evm_driver);
261
262MODULE_AUTHOR("Vladimir Barinov");
263MODULE_DESCRIPTION("TI DAVINCI EVM ASoC driver");
264MODULE_LICENSE("GPL");
265