xref: /openbmc/linux/sound/arm/pxa2xx-ac97.c (revision 3210e62a)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * linux/sound/pxa2xx-ac97.c -- AC97 support for the Intel PXA2xx chip.
4  *
5  * Author:	Nicolas Pitre
6  * Created:	Dec 02, 2004
7  * Copyright:	MontaVista Software Inc.
8  */
9 
10 #include <linux/init.h>
11 #include <linux/io.h>
12 #include <linux/module.h>
13 #include <linux/platform_device.h>
14 #include <linux/dmaengine.h>
15 #include <linux/dma-mapping.h>
16 
17 #include <sound/core.h>
18 #include <sound/pcm.h>
19 #include <sound/ac97_codec.h>
20 #include <sound/initval.h>
21 #include <sound/pxa2xx-lib.h>
22 #include <sound/dmaengine_pcm.h>
23 
24 #include <linux/platform_data/asoc-pxa.h>
25 
pxa2xx_ac97_legacy_reset(struct snd_ac97 * ac97)26 static void pxa2xx_ac97_legacy_reset(struct snd_ac97 *ac97)
27 {
28 	if (!pxa2xx_ac97_try_cold_reset())
29 		pxa2xx_ac97_try_warm_reset();
30 
31 	pxa2xx_ac97_finish_reset();
32 }
33 
pxa2xx_ac97_legacy_read(struct snd_ac97 * ac97,unsigned short reg)34 static unsigned short pxa2xx_ac97_legacy_read(struct snd_ac97 *ac97,
35 					      unsigned short reg)
36 {
37 	int ret;
38 
39 	ret = pxa2xx_ac97_read(ac97->num, reg);
40 	if (ret < 0)
41 		return 0;
42 	else
43 		return (unsigned short)(ret & 0xffff);
44 }
45 
pxa2xx_ac97_legacy_write(struct snd_ac97 * ac97,unsigned short reg,unsigned short val)46 static void pxa2xx_ac97_legacy_write(struct snd_ac97 *ac97,
47 				     unsigned short reg, unsigned short val)
48 {
49 	pxa2xx_ac97_write(ac97->num, reg, val);
50 }
51 
52 static const struct snd_ac97_bus_ops pxa2xx_ac97_ops = {
53 	.read	= pxa2xx_ac97_legacy_read,
54 	.write	= pxa2xx_ac97_legacy_write,
55 	.reset	= pxa2xx_ac97_legacy_reset,
56 };
57 
58 static struct snd_pcm *pxa2xx_ac97_pcm;
59 static struct snd_ac97 *pxa2xx_ac97_ac97;
60 
pxa2xx_ac97_pcm_open(struct snd_pcm_substream * substream)61 static int pxa2xx_ac97_pcm_open(struct snd_pcm_substream *substream)
62 {
63 	struct snd_pcm_runtime *runtime = substream->runtime;
64 	pxa2xx_audio_ops_t *platform_ops;
65 	int ret, i;
66 
67 	ret = pxa2xx_pcm_open(substream);
68 	if (ret)
69 		return ret;
70 
71 	runtime->hw.channels_min = 2;
72 	runtime->hw.channels_max = 2;
73 
74 	i = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
75 		AC97_RATES_FRONT_DAC : AC97_RATES_ADC;
76 	runtime->hw.rates = pxa2xx_ac97_ac97->rates[i];
77 	snd_pcm_limit_hw_rates(runtime);
78 
79 	platform_ops = substream->pcm->card->dev->platform_data;
80 	if (platform_ops && platform_ops->startup) {
81 		ret = platform_ops->startup(substream, platform_ops->priv);
82 		if (ret < 0)
83 			pxa2xx_pcm_close(substream);
84 	}
85 
86 	return ret;
87 }
88 
pxa2xx_ac97_pcm_close(struct snd_pcm_substream * substream)89 static int pxa2xx_ac97_pcm_close(struct snd_pcm_substream *substream)
90 {
91 	pxa2xx_audio_ops_t *platform_ops;
92 
93 	platform_ops = substream->pcm->card->dev->platform_data;
94 	if (platform_ops && platform_ops->shutdown)
95 		platform_ops->shutdown(substream, platform_ops->priv);
96 
97 	return 0;
98 }
99 
pxa2xx_ac97_pcm_prepare(struct snd_pcm_substream * substream)100 static int pxa2xx_ac97_pcm_prepare(struct snd_pcm_substream *substream)
101 {
102 	struct snd_pcm_runtime *runtime = substream->runtime;
103 	int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
104 		  AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE;
105 	int ret;
106 
107 	ret = pxa2xx_pcm_prepare(substream);
108 	if (ret < 0)
109 		return ret;
110 
111 	return snd_ac97_set_rate(pxa2xx_ac97_ac97, reg, runtime->rate);
112 }
113 
114 #ifdef CONFIG_PM_SLEEP
115 
pxa2xx_ac97_do_suspend(struct snd_card * card)116 static int pxa2xx_ac97_do_suspend(struct snd_card *card)
117 {
118 	pxa2xx_audio_ops_t *platform_ops = card->dev->platform_data;
119 
120 	snd_power_change_state(card, SNDRV_CTL_POWER_D3cold);
121 	snd_ac97_suspend(pxa2xx_ac97_ac97);
122 	if (platform_ops && platform_ops->suspend)
123 		platform_ops->suspend(platform_ops->priv);
124 
125 	return pxa2xx_ac97_hw_suspend();
126 }
127 
pxa2xx_ac97_do_resume(struct snd_card * card)128 static int pxa2xx_ac97_do_resume(struct snd_card *card)
129 {
130 	pxa2xx_audio_ops_t *platform_ops = card->dev->platform_data;
131 	int rc;
132 
133 	rc = pxa2xx_ac97_hw_resume();
134 	if (rc)
135 		return rc;
136 
137 	if (platform_ops && platform_ops->resume)
138 		platform_ops->resume(platform_ops->priv);
139 	snd_ac97_resume(pxa2xx_ac97_ac97);
140 	snd_power_change_state(card, SNDRV_CTL_POWER_D0);
141 
142 	return 0;
143 }
144 
pxa2xx_ac97_suspend(struct device * dev)145 static int pxa2xx_ac97_suspend(struct device *dev)
146 {
147 	struct snd_card *card = dev_get_drvdata(dev);
148 	int ret = 0;
149 
150 	if (card)
151 		ret = pxa2xx_ac97_do_suspend(card);
152 
153 	return ret;
154 }
155 
pxa2xx_ac97_resume(struct device * dev)156 static int pxa2xx_ac97_resume(struct device *dev)
157 {
158 	struct snd_card *card = dev_get_drvdata(dev);
159 	int ret = 0;
160 
161 	if (card)
162 		ret = pxa2xx_ac97_do_resume(card);
163 
164 	return ret;
165 }
166 
167 static SIMPLE_DEV_PM_OPS(pxa2xx_ac97_pm_ops, pxa2xx_ac97_suspend, pxa2xx_ac97_resume);
168 #endif
169 
170 static const struct snd_pcm_ops pxa2xx_ac97_pcm_ops = {
171 	.open		= pxa2xx_ac97_pcm_open,
172 	.close		= pxa2xx_ac97_pcm_close,
173 	.hw_params	= pxa2xx_pcm_hw_params,
174 	.prepare	= pxa2xx_ac97_pcm_prepare,
175 	.trigger	= pxa2xx_pcm_trigger,
176 	.pointer	= pxa2xx_pcm_pointer,
177 };
178 
179 
pxa2xx_ac97_pcm_new(struct snd_card * card)180 static int pxa2xx_ac97_pcm_new(struct snd_card *card)
181 {
182 	struct snd_pcm *pcm;
183 	int ret;
184 
185 	ret = snd_pcm_new(card, "PXA2xx-PCM", 0, 1, 1, &pcm);
186 	if (ret)
187 		goto out;
188 
189 	ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
190 	if (ret)
191 		goto out;
192 
193 	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &pxa2xx_ac97_pcm_ops);
194 	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &pxa2xx_ac97_pcm_ops);
195 	ret = pxa2xx_pcm_preallocate_dma_buffer(pcm);
196 	if (ret)
197 		goto out;
198 
199 	pxa2xx_ac97_pcm = pcm;
200 	ret = 0;
201 
202  out:
203 	return ret;
204 }
205 
pxa2xx_ac97_probe(struct platform_device * dev)206 static int pxa2xx_ac97_probe(struct platform_device *dev)
207 {
208 	struct snd_card *card;
209 	struct snd_ac97_bus *ac97_bus;
210 	struct snd_ac97_template ac97_template;
211 	int ret;
212 	pxa2xx_audio_ops_t *pdata = dev->dev.platform_data;
213 
214 	if (dev->id >= 0) {
215 		dev_err(&dev->dev, "PXA2xx has only one AC97 port.\n");
216 		ret = -ENXIO;
217 		goto err_dev;
218 	}
219 
220 	ret = snd_card_new(&dev->dev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
221 			   THIS_MODULE, 0, &card);
222 	if (ret < 0)
223 		goto err;
224 
225 	strscpy(card->driver, dev->dev.driver->name, sizeof(card->driver));
226 
227 	ret = pxa2xx_ac97_pcm_new(card);
228 	if (ret)
229 		goto err;
230 
231 	ret = pxa2xx_ac97_hw_probe(dev);
232 	if (ret)
233 		goto err;
234 
235 	ret = snd_ac97_bus(card, 0, &pxa2xx_ac97_ops, NULL, &ac97_bus);
236 	if (ret)
237 		goto err_remove;
238 	memset(&ac97_template, 0, sizeof(ac97_template));
239 	ret = snd_ac97_mixer(ac97_bus, &ac97_template, &pxa2xx_ac97_ac97);
240 	if (ret)
241 		goto err_remove;
242 
243 	snprintf(card->shortname, sizeof(card->shortname),
244 		 "%s", snd_ac97_get_short_name(pxa2xx_ac97_ac97));
245 	snprintf(card->longname, sizeof(card->longname),
246 		 "%s (%s)", dev->dev.driver->name, card->mixername);
247 
248 	if (pdata && pdata->codec_pdata[0])
249 		snd_ac97_dev_add_pdata(ac97_bus->codec[0], pdata->codec_pdata[0]);
250 	ret = snd_card_register(card);
251 	if (ret == 0) {
252 		platform_set_drvdata(dev, card);
253 		return 0;
254 	}
255 
256 err_remove:
257 	pxa2xx_ac97_hw_remove(dev);
258 err:
259 	if (card)
260 		snd_card_free(card);
261 err_dev:
262 	return ret;
263 }
264 
pxa2xx_ac97_remove(struct platform_device * dev)265 static void pxa2xx_ac97_remove(struct platform_device *dev)
266 {
267 	struct snd_card *card = platform_get_drvdata(dev);
268 
269 	if (card) {
270 		snd_card_free(card);
271 		pxa2xx_ac97_hw_remove(dev);
272 	}
273 }
274 
275 static struct platform_driver pxa2xx_ac97_driver = {
276 	.probe		= pxa2xx_ac97_probe,
277 	.remove_new	= pxa2xx_ac97_remove,
278 	.driver		= {
279 		.name	= "pxa2xx-ac97",
280 #ifdef CONFIG_PM_SLEEP
281 		.pm	= &pxa2xx_ac97_pm_ops,
282 #endif
283 	},
284 };
285 
286 module_platform_driver(pxa2xx_ac97_driver);
287 
288 MODULE_AUTHOR("Nicolas Pitre");
289 MODULE_DESCRIPTION("AC97 driver for the Intel PXA2xx chip");
290 MODULE_LICENSE("GPL");
291 MODULE_ALIAS("platform:pxa2xx-ac97");
292