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
26static 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
34static 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
46static 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
52static 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
58static struct snd_pcm *pxa2xx_ac97_pcm;
59static struct snd_ac97 *pxa2xx_ac97_ac97;
60
61static 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
89static 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
100static 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
114static int pxa2xx_ac97_do_suspend(struct snd_card *card)
115{
116	pxa2xx_audio_ops_t *platform_ops = card->dev->platform_data;
117
118	snd_power_change_state(card, SNDRV_CTL_POWER_D3cold);
119	snd_ac97_suspend(pxa2xx_ac97_ac97);
120	if (platform_ops && platform_ops->suspend)
121		platform_ops->suspend(platform_ops->priv);
122
123	return pxa2xx_ac97_hw_suspend();
124}
125
126static int pxa2xx_ac97_do_resume(struct snd_card *card)
127{
128	pxa2xx_audio_ops_t *platform_ops = card->dev->platform_data;
129	int rc;
130
131	rc = pxa2xx_ac97_hw_resume();
132	if (rc)
133		return rc;
134
135	if (platform_ops && platform_ops->resume)
136		platform_ops->resume(platform_ops->priv);
137	snd_ac97_resume(pxa2xx_ac97_ac97);
138	snd_power_change_state(card, SNDRV_CTL_POWER_D0);
139
140	return 0;
141}
142
143static int pxa2xx_ac97_suspend(struct device *dev)
144{
145	struct snd_card *card = dev_get_drvdata(dev);
146	int ret = 0;
147
148	if (card)
149		ret = pxa2xx_ac97_do_suspend(card);
150
151	return ret;
152}
153
154static int pxa2xx_ac97_resume(struct device *dev)
155{
156	struct snd_card *card = dev_get_drvdata(dev);
157	int ret = 0;
158
159	if (card)
160		ret = pxa2xx_ac97_do_resume(card);
161
162	return ret;
163}
164
165static DEFINE_SIMPLE_DEV_PM_OPS(pxa2xx_ac97_pm_ops, pxa2xx_ac97_suspend, pxa2xx_ac97_resume);
166
167static const struct snd_pcm_ops pxa2xx_ac97_pcm_ops = {
168	.open		= pxa2xx_ac97_pcm_open,
169	.close		= pxa2xx_ac97_pcm_close,
170	.hw_params	= pxa2xx_pcm_hw_params,
171	.prepare	= pxa2xx_ac97_pcm_prepare,
172	.trigger	= pxa2xx_pcm_trigger,
173	.pointer	= pxa2xx_pcm_pointer,
174};
175
176
177static int pxa2xx_ac97_pcm_new(struct snd_card *card)
178{
179	struct snd_pcm *pcm;
180	int ret;
181
182	ret = snd_pcm_new(card, "PXA2xx-PCM", 0, 1, 1, &pcm);
183	if (ret)
184		goto out;
185
186	ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
187	if (ret)
188		goto out;
189
190	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &pxa2xx_ac97_pcm_ops);
191	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &pxa2xx_ac97_pcm_ops);
192	ret = pxa2xx_pcm_preallocate_dma_buffer(pcm);
193	if (ret)
194		goto out;
195
196	pxa2xx_ac97_pcm = pcm;
197	ret = 0;
198
199 out:
200	return ret;
201}
202
203static int pxa2xx_ac97_probe(struct platform_device *dev)
204{
205	struct snd_card *card;
206	struct snd_ac97_bus *ac97_bus;
207	struct snd_ac97_template ac97_template;
208	int ret;
209	pxa2xx_audio_ops_t *pdata = dev->dev.platform_data;
210
211	if (dev->id >= 0) {
212		dev_err(&dev->dev, "PXA2xx has only one AC97 port.\n");
213		ret = -ENXIO;
214		goto err_dev;
215	}
216
217	ret = snd_card_new(&dev->dev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
218			   THIS_MODULE, 0, &card);
219	if (ret < 0)
220		goto err;
221
222	strscpy(card->driver, dev->dev.driver->name, sizeof(card->driver));
223
224	ret = pxa2xx_ac97_pcm_new(card);
225	if (ret)
226		goto err;
227
228	ret = pxa2xx_ac97_hw_probe(dev);
229	if (ret)
230		goto err;
231
232	ret = snd_ac97_bus(card, 0, &pxa2xx_ac97_ops, NULL, &ac97_bus);
233	if (ret)
234		goto err_remove;
235	memset(&ac97_template, 0, sizeof(ac97_template));
236	ret = snd_ac97_mixer(ac97_bus, &ac97_template, &pxa2xx_ac97_ac97);
237	if (ret)
238		goto err_remove;
239
240	snprintf(card->shortname, sizeof(card->shortname),
241		 "%s", snd_ac97_get_short_name(pxa2xx_ac97_ac97));
242	snprintf(card->longname, sizeof(card->longname),
243		 "%s (%s)", dev->dev.driver->name, card->mixername);
244
245	if (pdata && pdata->codec_pdata[0])
246		snd_ac97_dev_add_pdata(ac97_bus->codec[0], pdata->codec_pdata[0]);
247	ret = snd_card_register(card);
248	if (ret == 0) {
249		platform_set_drvdata(dev, card);
250		return 0;
251	}
252
253err_remove:
254	pxa2xx_ac97_hw_remove(dev);
255err:
256	if (card)
257		snd_card_free(card);
258err_dev:
259	return ret;
260}
261
262static void pxa2xx_ac97_remove(struct platform_device *dev)
263{
264	struct snd_card *card = platform_get_drvdata(dev);
265
266	if (card) {
267		snd_card_free(card);
268		pxa2xx_ac97_hw_remove(dev);
269	}
270}
271
272static struct platform_driver pxa2xx_ac97_driver = {
273	.probe		= pxa2xx_ac97_probe,
274	.remove_new	= pxa2xx_ac97_remove,
275	.driver		= {
276		.name	= "pxa2xx-ac97",
277		.pm	= &pxa2xx_ac97_pm_ops,
278	},
279};
280
281module_platform_driver(pxa2xx_ac97_driver);
282
283MODULE_AUTHOR("Nicolas Pitre");
284MODULE_DESCRIPTION("AC97 driver for the Intel PXA2xx chip");
285MODULE_LICENSE("GPL");
286MODULE_ALIAS("platform:pxa2xx-ac97");
287