davinci-evm.c

  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 = snd_soc_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 = snd_soc_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 = snd_soc_substream_to_rtd(substream);
 56	struct snd_soc_dai *codec_dai = snd_soc_rtd_to_codec(rtd, 0);
 57	struct snd_soc_dai *cpu_dai = snd_soc_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 snd_soc_dapm_context *dapm = snd_soc_card_to_dapm(rtd->card);
117	struct device_node *np = card->dev->of_node;
118	int ret;
119
120	/* Add davinci-evm specific widgets */
121	snd_soc_dapm_new_controls(dapm, aic3x_dapm_widgets,
122				  ARRAY_SIZE(aic3x_dapm_widgets));
123
124	if (np) {
125		ret = snd_soc_of_parse_audio_routing(card, "ti,audio-routing");
126		if (ret)
127			return ret;
128	} else {
129		/* Set up davinci-evm specific audio path audio_map */
130		snd_soc_dapm_add_routes(dapm, audio_map,
131					ARRAY_SIZE(audio_map));
132	}
133
134	/* not connected */
135	snd_soc_dapm_disable_pin(dapm, "MONO_LOUT");
136	snd_soc_dapm_disable_pin(dapm, "HPLCOM");
137	snd_soc_dapm_disable_pin(dapm, "HPRCOM");
138
139	return 0;
140}
141
142/*
143 * The struct is used as place holder. It will be completely
144 * filled with data from dt node.
145 */
146SND_SOC_DAILINK_DEFS(evm,
147	DAILINK_COMP_ARRAY(COMP_EMPTY()),
148	DAILINK_COMP_ARRAY(COMP_CODEC(NULL, "tlv320aic3x-hifi")),
149	DAILINK_COMP_ARRAY(COMP_EMPTY()));
150
151static struct snd_soc_dai_link evm_dai_tlv320aic3x = {
152	.name		= "TLV320AIC3X",
153	.stream_name	= "AIC3X",
154	.ops            = &evm_ops,
155	.init           = evm_aic3x_init,
156	.dai_fmt = SND_SOC_DAIFMT_DSP_B | SND_SOC_DAIFMT_CBP_CFP |
157		   SND_SOC_DAIFMT_IB_NF,
158	SND_SOC_DAILINK_REG(evm),
159};
160
161static const struct of_device_id davinci_evm_dt_ids[] = {
162	{
163		.compatible = "ti,da830-evm-audio",
164		.data = (void *) &evm_dai_tlv320aic3x,
165	},
166	{ /* sentinel */ }
167};
168MODULE_DEVICE_TABLE(of, davinci_evm_dt_ids);
169
170/* davinci evm audio machine driver */
171static struct snd_soc_card evm_soc_card = {
172	.owner = THIS_MODULE,
173	.num_links = 1,
174};
175
176static int davinci_evm_probe(struct platform_device *pdev)
177{
178	struct device_node *np = pdev->dev.of_node;
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	dai = (struct snd_soc_dai_link *) device_get_match_data(&pdev->dev);
185	if (!dai) {
186		dev_err(&pdev->dev, "Error: No device match found\n");
187		return -ENODEV;
188	}
189
190	evm_soc_card.dai_link = dai;
191
192	dai->codecs->of_node = of_parse_phandle(np, "ti,audio-codec", 0);
193	if (!dai->codecs->of_node)
194		return -EINVAL;
195
196	dai->cpus->of_node = of_parse_phandle(np, "ti,mcasp-controller", 0);
197	if (!dai->cpus->of_node) {
198		ret = -EINVAL;
199		goto err_put;
200	}
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		goto err_put;
208
209	mclk = devm_clk_get(&pdev->dev, "mclk");
210	if (PTR_ERR(mclk) == -EPROBE_DEFER) {
211		ret = -EPROBE_DEFER;
212		goto err_put;
213	} else if (IS_ERR(mclk)) {
214		dev_dbg(&pdev->dev, "mclk not found.\n");
215		mclk = NULL;
216	}
217
218	drvdata = devm_kzalloc(&pdev->dev, sizeof(*drvdata), GFP_KERNEL);
219	if (!drvdata) {
220		ret = -ENOMEM;
221		goto err_put;
222	}
223
224	drvdata->mclk = mclk;
225
226	ret = of_property_read_u32(np, "ti,codec-clock-rate", &drvdata->sysclk);
227
228	if (ret < 0) {
229		if (!drvdata->mclk) {
230			dev_err(&pdev->dev,
231				"No clock or clock rate defined.\n");
232			ret = -EINVAL;
233			goto err_put;
234		}
235		drvdata->sysclk = clk_get_rate(drvdata->mclk);
236	} else if (drvdata->mclk) {
237		unsigned int requestd_rate = drvdata->sysclk;
238		clk_set_rate(drvdata->mclk, drvdata->sysclk);
239		drvdata->sysclk = clk_get_rate(drvdata->mclk);
240		if (drvdata->sysclk != requestd_rate)
241			dev_warn(&pdev->dev,
242				 "Could not get requested rate %u using %u.\n",
243				 requestd_rate, drvdata->sysclk);
244	}
245
246	snd_soc_card_set_drvdata(&evm_soc_card, drvdata);
247	ret = devm_snd_soc_register_card(&pdev->dev, &evm_soc_card);
248
249	if (ret) {
250		dev_err(&pdev->dev, "snd_soc_register_card failed (%d)\n", ret);
251		goto err_put;
252	}
253
254	return ret;
255
256err_put:
257	dai->platforms->of_node = NULL;
258
259	if (dai->cpus->of_node) {
260		of_node_put(dai->cpus->of_node);
261		dai->cpus->of_node = NULL;
262	}
263
264	if (dai->codecs->of_node) {
265		of_node_put(dai->codecs->of_node);
266		dai->codecs->of_node = NULL;
267	}
268
269	return ret;
270}
271
272static struct platform_driver davinci_evm_driver = {
273	.probe		= davinci_evm_probe,
274	.driver		= {
275		.name	= "davinci_evm",
276		.pm	= &snd_soc_pm_ops,
277		.of_match_table = davinci_evm_dt_ids,
278	},
279};
280
281module_platform_driver(davinci_evm_driver);
282
283MODULE_AUTHOR("Vladimir Barinov");
284MODULE_DESCRIPTION("TI DAVINCI EVM ASoC driver");
285MODULE_LICENSE("GPL");