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(slot: 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(slot: 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(ac97: pxa2xx_ac97_ac97, reg, rate: 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(ac97: 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(ac97: 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, id: "PXA2xx-PCM", device: 0, playback_count: 1, capture_count: 1, rpcm: &pcm);
183 if (ret)
184 goto out;
185
186 ret = dma_coerce_mask_and_coherent(dev: card->dev, DMA_BIT_MASK(32));
187 if (ret)
188 goto out;
189
190 snd_pcm_set_ops(pcm, direction: SNDRV_PCM_STREAM_PLAYBACK, ops: &pxa2xx_ac97_pcm_ops);
191 snd_pcm_set_ops(pcm, direction: SNDRV_PCM_STREAM_CAPTURE, ops: &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(parent: &dev->dev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
218 THIS_MODULE, extra_size: 0, card_ret: &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, num: 0, ops: &pxa2xx_ac97_ops, NULL, rbus: &ac97_bus);
233 if (ret)
234 goto err_remove;
235 memset(&ac97_template, 0, sizeof(ac97_template));
236 ret = snd_ac97_mixer(bus: ac97_bus, template: &ac97_template, rac97: &pxa2xx_ac97_ac97);
237 if (ret)
238 goto err_remove;
239
240 snprintf(buf: card->shortname, size: sizeof(card->shortname),
241 fmt: "%s", snd_ac97_get_short_name(ac97: pxa2xx_ac97_ac97));
242 snprintf(buf: card->longname, size: sizeof(card->longname),
243 fmt: "%s (%s)", dev->dev.driver->name, card->mixername);
244
245 if (pdata && pdata->codec_pdata[0])
246 snd_ac97_dev_add_pdata(ac97: ac97_bus->codec[0], data: pdata->codec_pdata[0]);
247 ret = snd_card_register(card);
248 if (ret == 0) {
249 platform_set_drvdata(pdev: dev, data: 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(pdev: 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 = 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

source code of linux/sound/arm/pxa2xx-ac97.c