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 <mach/regs-ac97.h>
25#include <mach/audio.h>
26
27static void pxa2xx_ac97_legacy_reset(struct snd_ac97 *ac97)
28{
29	if (!pxa2xx_ac97_try_cold_reset())
30		pxa2xx_ac97_try_warm_reset();
31
32	pxa2xx_ac97_finish_reset();
33}
34
35static unsigned short pxa2xx_ac97_legacy_read(struct snd_ac97 *ac97,
36					      unsigned short reg)
37{
38	int ret;
39
40	ret = pxa2xx_ac97_read(ac97->num, reg);
41	if (ret < 0)
42		return 0;
43	else
44		return (unsigned short)(ret & 0xffff);
45}
46
47static void pxa2xx_ac97_legacy_write(struct snd_ac97 *ac97,
48				     unsigned short reg, unsigned short val)
49{
50	int __always_unused ret;
51
52	ret = pxa2xx_ac97_write(ac97->num, reg, val);
53}
54
55static const struct snd_ac97_bus_ops pxa2xx_ac97_ops = {
56	.read	= pxa2xx_ac97_legacy_read,
57	.write	= pxa2xx_ac97_legacy_write,
58	.reset	= pxa2xx_ac97_legacy_reset,
59};
60
61static struct snd_pcm *pxa2xx_ac97_pcm;
62static struct snd_ac97 *pxa2xx_ac97_ac97;
63
64static int pxa2xx_ac97_pcm_open(struct snd_pcm_substream *substream)
65{
66	struct snd_pcm_runtime *runtime = substream->runtime;
67	pxa2xx_audio_ops_t *platform_ops;
68	int ret, i;
69
70	ret = pxa2xx_pcm_open(substream);
71	if (ret)
72		return ret;
73
74	runtime->hw.channels_min = 2;
75	runtime->hw.channels_max = 2;
76
77	i = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
78		AC97_RATES_FRONT_DAC : AC97_RATES_ADC;
79	runtime->hw.rates = pxa2xx_ac97_ac97->rates[i];
80	snd_pcm_limit_hw_rates(runtime);
81
82	platform_ops = substream->pcm->card->dev->platform_data;
83	if (platform_ops && platform_ops->startup) {
84		ret = platform_ops->startup(substream, platform_ops->priv);
85		if (ret < 0)
86			pxa2xx_pcm_close(substream);
87	}
88
89	return ret;
90}
91
92static int pxa2xx_ac97_pcm_close(struct snd_pcm_substream *substream)
93{
94	pxa2xx_audio_ops_t *platform_ops;
95
96	platform_ops = substream->pcm->card->dev->platform_data;
97	if (platform_ops && platform_ops->shutdown)
98		platform_ops->shutdown(substream, platform_ops->priv);
99
100	return 0;
101}
102
103static int pxa2xx_ac97_pcm_prepare(struct snd_pcm_substream *substream)
104{
105	struct snd_pcm_runtime *runtime = substream->runtime;
106	int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
107		  AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE;
108	int ret;
109
110	ret = pxa2xx_pcm_prepare(substream);
111	if (ret < 0)
112		return ret;
113
114	return snd_ac97_set_rate(pxa2xx_ac97_ac97, reg, runtime->rate);
115}
116
117#ifdef CONFIG_PM_SLEEP
118
119static int pxa2xx_ac97_do_suspend(struct snd_card *card)
120{
121	pxa2xx_audio_ops_t *platform_ops = card->dev->platform_data;
122
123	snd_power_change_state(card, SNDRV_CTL_POWER_D3cold);
124	snd_ac97_suspend(pxa2xx_ac97_ac97);
125	if (platform_ops && platform_ops->suspend)
126		platform_ops->suspend(platform_ops->priv);
127
128	return pxa2xx_ac97_hw_suspend();
129}
130
131static int pxa2xx_ac97_do_resume(struct snd_card *card)
132{
133	pxa2xx_audio_ops_t *platform_ops = card->dev->platform_data;
134	int rc;
135
136	rc = pxa2xx_ac97_hw_resume();
137	if (rc)
138		return rc;
139
140	if (platform_ops && platform_ops->resume)
141		platform_ops->resume(platform_ops->priv);
142	snd_ac97_resume(pxa2xx_ac97_ac97);
143	snd_power_change_state(card, SNDRV_CTL_POWER_D0);
144
145	return 0;
146}
147
148static int pxa2xx_ac97_suspend(struct device *dev)
149{
150	struct snd_card *card = dev_get_drvdata(dev);
151	int ret = 0;
152
153	if (card)
154		ret = pxa2xx_ac97_do_suspend(card);
155
156	return ret;
157}
158
159static int pxa2xx_ac97_resume(struct device *dev)
160{
161	struct snd_card *card = dev_get_drvdata(dev);
162	int ret = 0;
163
164	if (card)
165		ret = pxa2xx_ac97_do_resume(card);
166
167	return ret;
168}
169
170static SIMPLE_DEV_PM_OPS(pxa2xx_ac97_pm_ops, pxa2xx_ac97_suspend, pxa2xx_ac97_resume);
171#endif
172
173static const struct snd_pcm_ops pxa2xx_ac97_pcm_ops = {
174	.open		= pxa2xx_ac97_pcm_open,
175	.close		= pxa2xx_ac97_pcm_close,
176	.hw_params	= pxa2xx_pcm_hw_params,
177	.hw_free	= pxa2xx_pcm_hw_free,
178	.prepare	= pxa2xx_ac97_pcm_prepare,
179	.trigger	= pxa2xx_pcm_trigger,
180	.pointer	= pxa2xx_pcm_pointer,
181	.mmap		= pxa2xx_pcm_mmap,
182};
183
184
185static int pxa2xx_ac97_pcm_new(struct snd_card *card)
186{
187	struct snd_pcm *pcm;
188	int stream, ret;
189
190	ret = snd_pcm_new(card, "PXA2xx-PCM", 0, 1, 1, &pcm);
191	if (ret)
192		goto out;
193
194	pcm->private_free = pxa2xx_pcm_free_dma_buffers;
195
196	ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
197	if (ret)
198		goto out;
199
200	stream = SNDRV_PCM_STREAM_PLAYBACK;
201	snd_pcm_set_ops(pcm, stream, &pxa2xx_ac97_pcm_ops);
202	ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, stream);
203	if (ret)
204		goto out;
205
206	stream = SNDRV_PCM_STREAM_CAPTURE;
207	snd_pcm_set_ops(pcm, stream, &pxa2xx_ac97_pcm_ops);
208	ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, stream);
209	if (ret)
210		goto out;
211
212	pxa2xx_ac97_pcm = pcm;
213	ret = 0;
214
215 out:
216	return ret;
217}
218
219static int pxa2xx_ac97_probe(struct platform_device *dev)
220{
221	struct snd_card *card;
222	struct snd_ac97_bus *ac97_bus;
223	struct snd_ac97_template ac97_template;
224	int ret;
225	pxa2xx_audio_ops_t *pdata = dev->dev.platform_data;
226
227	if (dev->id >= 0) {
228		dev_err(&dev->dev, "PXA2xx has only one AC97 port.\n");
229		ret = -ENXIO;
230		goto err_dev;
231	}
232
233	ret = snd_card_new(&dev->dev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
234			   THIS_MODULE, 0, &card);
235	if (ret < 0)
236		goto err;
237
238	strlcpy(card->driver, dev->dev.driver->name, sizeof(card->driver));
239
240	ret = pxa2xx_ac97_pcm_new(card);
241	if (ret)
242		goto err;
243
244	ret = pxa2xx_ac97_hw_probe(dev);
245	if (ret)
246		goto err;
247
248	ret = snd_ac97_bus(card, 0, &pxa2xx_ac97_ops, NULL, &ac97_bus);
249	if (ret)
250		goto err_remove;
251	memset(&ac97_template, 0, sizeof(ac97_template));
252	ret = snd_ac97_mixer(ac97_bus, &ac97_template, &pxa2xx_ac97_ac97);
253	if (ret)
254		goto err_remove;
255
256	snprintf(card->shortname, sizeof(card->shortname),
257		 "%s", snd_ac97_get_short_name(pxa2xx_ac97_ac97));
258	snprintf(card->longname, sizeof(card->longname),
259		 "%s (%s)", dev->dev.driver->name, card->mixername);
260
261	if (pdata && pdata->codec_pdata[0])
262		snd_ac97_dev_add_pdata(ac97_bus->codec[0], pdata->codec_pdata[0]);
263	ret = snd_card_register(card);
264	if (ret == 0) {
265		platform_set_drvdata(dev, card);
266		return 0;
267	}
268
269err_remove:
270	pxa2xx_ac97_hw_remove(dev);
271err:
272	if (card)
273		snd_card_free(card);
274err_dev:
275	return ret;
276}
277
278static int pxa2xx_ac97_remove(struct platform_device *dev)
279{
280	struct snd_card *card = platform_get_drvdata(dev);
281
282	if (card) {
283		snd_card_free(card);
284		pxa2xx_ac97_hw_remove(dev);
285	}
286
287	return 0;
288}
289
290static struct platform_driver pxa2xx_ac97_driver = {
291	.probe		= pxa2xx_ac97_probe,
292	.remove		= pxa2xx_ac97_remove,
293	.driver		= {
294		.name	= "pxa2xx-ac97",
295#ifdef CONFIG_PM_SLEEP
296		.pm	= &pxa2xx_ac97_pm_ops,
297#endif
298	},
299};
300
301module_platform_driver(pxa2xx_ac97_driver);
302
303MODULE_AUTHOR("Nicolas Pitre");
304MODULE_DESCRIPTION("AC97 driver for the Intel PXA2xx chip");
305MODULE_LICENSE("GPL");
306MODULE_ALIAS("platform:pxa2xx-ac97");
307