1 // SPDX-License-Identifier: GPL-2.0-only
3 * linux/sound/pxa2xx-ac97.c -- AC97 support for the Intel PXA2xx chip.
5 * Author: Nicolas Pitre
6 * Created: Dec 02, 2004
7 * Copyright: MontaVista Software Inc.
10 #include <linux/init.h>
12 #include <linux/module.h>
13 #include <linux/platform_device.h>
14 #include <linux/dmaengine.h>
15 #include <linux/dma-mapping.h>
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>
24 #include <mach/regs-ac97.h>
25 #include <mach/audio.h>
27 static void pxa2xx_ac97_legacy_reset(struct snd_ac97 *ac97)
29 if (!pxa2xx_ac97_try_cold_reset())
30 pxa2xx_ac97_try_warm_reset();
32 pxa2xx_ac97_finish_reset();
35 static unsigned short pxa2xx_ac97_legacy_read(struct snd_ac97 *ac97,
40 ret = pxa2xx_ac97_read(ac97->num, reg);
44 return (unsigned short)(ret & 0xffff);
47 static void pxa2xx_ac97_legacy_write(struct snd_ac97 *ac97,
48 unsigned short reg, unsigned short val)
50 int __always_unused ret;
52 ret = pxa2xx_ac97_write(ac97->num, reg, val);
55 static 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,
61 static struct snd_pcm *pxa2xx_ac97_pcm;
62 static struct snd_ac97 *pxa2xx_ac97_ac97;
64 static int pxa2xx_ac97_pcm_open(struct snd_pcm_substream *substream)
66 struct snd_pcm_runtime *runtime = substream->runtime;
67 pxa2xx_audio_ops_t *platform_ops;
70 ret = pxa2xx_pcm_open(substream);
74 runtime->hw.channels_min = 2;
75 runtime->hw.channels_max = 2;
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);
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);
86 pxa2xx_pcm_close(substream);
92 static int pxa2xx_ac97_pcm_close(struct snd_pcm_substream *substream)
94 pxa2xx_audio_ops_t *platform_ops;
96 platform_ops = substream->pcm->card->dev->platform_data;
97 if (platform_ops && platform_ops->shutdown)
98 platform_ops->shutdown(substream, platform_ops->priv);
103 static int pxa2xx_ac97_pcm_prepare(struct snd_pcm_substream *substream)
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;
110 ret = pxa2xx_pcm_prepare(substream);
114 return snd_ac97_set_rate(pxa2xx_ac97_ac97, reg, runtime->rate);
117 #ifdef CONFIG_PM_SLEEP
119 static int pxa2xx_ac97_do_suspend(struct snd_card *card)
121 pxa2xx_audio_ops_t *platform_ops = card->dev->platform_data;
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);
128 return pxa2xx_ac97_hw_suspend();
131 static int pxa2xx_ac97_do_resume(struct snd_card *card)
133 pxa2xx_audio_ops_t *platform_ops = card->dev->platform_data;
136 rc = pxa2xx_ac97_hw_resume();
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);
148 static int pxa2xx_ac97_suspend(struct device *dev)
150 struct snd_card *card = dev_get_drvdata(dev);
154 ret = pxa2xx_ac97_do_suspend(card);
159 static int pxa2xx_ac97_resume(struct device *dev)
161 struct snd_card *card = dev_get_drvdata(dev);
165 ret = pxa2xx_ac97_do_resume(card);
170 static SIMPLE_DEV_PM_OPS(pxa2xx_ac97_pm_ops, pxa2xx_ac97_suspend, pxa2xx_ac97_resume);
173 static 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,
185 static int pxa2xx_ac97_pcm_new(struct snd_card *card)
190 ret = snd_pcm_new(card, "PXA2xx-PCM", 0, 1, 1, &pcm);
194 pcm->private_free = pxa2xx_pcm_free_dma_buffers;
196 ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
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);
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);
212 pxa2xx_ac97_pcm = pcm;
219 static int pxa2xx_ac97_probe(struct platform_device *dev)
221 struct snd_card *card;
222 struct snd_ac97_bus *ac97_bus;
223 struct snd_ac97_template ac97_template;
225 pxa2xx_audio_ops_t *pdata = dev->dev.platform_data;
228 dev_err(&dev->dev, "PXA2xx has only one AC97 port.\n");
233 ret = snd_card_new(&dev->dev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
234 THIS_MODULE, 0, &card);
238 strscpy(card->driver, dev->dev.driver->name, sizeof(card->driver));
240 ret = pxa2xx_ac97_pcm_new(card);
244 ret = pxa2xx_ac97_hw_probe(dev);
248 ret = snd_ac97_bus(card, 0, &pxa2xx_ac97_ops, NULL, &ac97_bus);
251 memset(&ac97_template, 0, sizeof(ac97_template));
252 ret = snd_ac97_mixer(ac97_bus, &ac97_template, &pxa2xx_ac97_ac97);
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);
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);
265 platform_set_drvdata(dev, card);
270 pxa2xx_ac97_hw_remove(dev);
278 static int pxa2xx_ac97_remove(struct platform_device *dev)
280 struct snd_card *card = platform_get_drvdata(dev);
284 pxa2xx_ac97_hw_remove(dev);
290 static struct platform_driver pxa2xx_ac97_driver = {
291 .probe = pxa2xx_ac97_probe,
292 .remove = pxa2xx_ac97_remove,
294 .name = "pxa2xx-ac97",
295 #ifdef CONFIG_PM_SLEEP
296 .pm = &pxa2xx_ac97_pm_ops,
301 module_platform_driver(pxa2xx_ac97_driver);
303 MODULE_AUTHOR("Nicolas Pitre");
304 MODULE_DESCRIPTION("AC97 driver for the Intel PXA2xx chip");
305 MODULE_LICENSE("GPL");
306 MODULE_ALIAS("platform:pxa2xx-ac97");