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Linux/sound/arm/pxa2xx-ac97.c

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  1 /*
  2  * linux/sound/pxa2xx-ac97.c -- AC97 support for the Intel PXA2xx chip.
  3  *
  4  * Author:      Nicolas Pitre
  5  * Created:     Dec 02, 2004
  6  * Copyright:   MontaVista Software Inc.
  7  *
  8  * This program is free software; you can redistribute it and/or modify
  9  * it under the terms of the GNU General Public License version 2 as
 10  * published by the Free Software Foundation.
 11  */
 12 
 13 #include <linux/init.h>
 14 #include <linux/io.h>
 15 #include <linux/module.h>
 16 #include <linux/platform_device.h>
 17 #include <linux/dmaengine.h>
 18 #include <linux/dma/pxa-dma.h>
 19 
 20 #include <sound/core.h>
 21 #include <sound/pcm.h>
 22 #include <sound/ac97_codec.h>
 23 #include <sound/initval.h>
 24 #include <sound/pxa2xx-lib.h>
 25 #include <sound/dmaengine_pcm.h>
 26 
 27 #include <mach/regs-ac97.h>
 28 #include <mach/audio.h>
 29 
 30 #include "pxa2xx-pcm.h"
 31 
 32 static void pxa2xx_ac97_legacy_reset(struct snd_ac97 *ac97)
 33 {
 34         if (!pxa2xx_ac97_try_cold_reset())
 35                 pxa2xx_ac97_try_warm_reset();
 36 
 37         pxa2xx_ac97_finish_reset();
 38 }
 39 
 40 static unsigned short pxa2xx_ac97_legacy_read(struct snd_ac97 *ac97,
 41                                               unsigned short reg)
 42 {
 43         int ret;
 44 
 45         ret = pxa2xx_ac97_read(ac97->num, reg);
 46         if (ret < 0)
 47                 return 0;
 48         else
 49                 return (unsigned short)(ret & 0xffff);
 50 }
 51 
 52 static void pxa2xx_ac97_legacy_write(struct snd_ac97 *ac97,
 53                                      unsigned short reg, unsigned short val)
 54 {
 55         int __always_unused ret;
 56 
 57         ret = pxa2xx_ac97_write(ac97->num, reg, val);
 58 }
 59 
 60 static struct snd_ac97_bus_ops pxa2xx_ac97_ops = {
 61         .read   = pxa2xx_ac97_legacy_read,
 62         .write  = pxa2xx_ac97_legacy_write,
 63         .reset  = pxa2xx_ac97_legacy_reset,
 64 };
 65 
 66 static struct pxad_param pxa2xx_ac97_pcm_out_req = {
 67         .prio = PXAD_PRIO_LOWEST,
 68         .drcmr = 12,
 69 };
 70 
 71 static struct snd_dmaengine_dai_dma_data pxa2xx_ac97_pcm_out = {
 72         .addr           = __PREG(PCDR),
 73         .addr_width     = DMA_SLAVE_BUSWIDTH_4_BYTES,
 74         .maxburst       = 32,
 75         .filter_data    = &pxa2xx_ac97_pcm_out_req,
 76 };
 77 
 78 static struct pxad_param pxa2xx_ac97_pcm_in_req = {
 79         .prio = PXAD_PRIO_LOWEST,
 80         .drcmr = 11,
 81 };
 82 
 83 static struct snd_dmaengine_dai_dma_data pxa2xx_ac97_pcm_in = {
 84         .addr           = __PREG(PCDR),
 85         .addr_width     = DMA_SLAVE_BUSWIDTH_4_BYTES,
 86         .maxburst       = 32,
 87         .filter_data    = &pxa2xx_ac97_pcm_in_req,
 88 };
 89 
 90 static struct snd_pcm *pxa2xx_ac97_pcm;
 91 static struct snd_ac97 *pxa2xx_ac97_ac97;
 92 
 93 static int pxa2xx_ac97_pcm_startup(struct snd_pcm_substream *substream)
 94 {
 95         struct snd_pcm_runtime *runtime = substream->runtime;
 96         pxa2xx_audio_ops_t *platform_ops;
 97         int r;
 98 
 99         runtime->hw.channels_min = 2;
100         runtime->hw.channels_max = 2;
101 
102         r = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
103             AC97_RATES_FRONT_DAC : AC97_RATES_ADC;
104         runtime->hw.rates = pxa2xx_ac97_ac97->rates[r];
105         snd_pcm_limit_hw_rates(runtime);
106 
107         platform_ops = substream->pcm->card->dev->platform_data;
108         if (platform_ops && platform_ops->startup)
109                 return platform_ops->startup(substream, platform_ops->priv);
110         else
111                 return 0;
112 }
113 
114 static void pxa2xx_ac97_pcm_shutdown(struct snd_pcm_substream *substream)
115 {
116         pxa2xx_audio_ops_t *platform_ops;
117 
118         platform_ops = substream->pcm->card->dev->platform_data;
119         if (platform_ops && platform_ops->shutdown)
120                 platform_ops->shutdown(substream, platform_ops->priv);
121 }
122 
123 static int pxa2xx_ac97_pcm_prepare(struct snd_pcm_substream *substream)
124 {
125         struct snd_pcm_runtime *runtime = substream->runtime;
126         int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
127                   AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE;
128         return snd_ac97_set_rate(pxa2xx_ac97_ac97, reg, runtime->rate);
129 }
130 
131 static struct pxa2xx_pcm_client pxa2xx_ac97_pcm_client = {
132         .playback_params        = &pxa2xx_ac97_pcm_out,
133         .capture_params         = &pxa2xx_ac97_pcm_in,
134         .startup                = pxa2xx_ac97_pcm_startup,
135         .shutdown               = pxa2xx_ac97_pcm_shutdown,
136         .prepare                = pxa2xx_ac97_pcm_prepare,
137 };
138 
139 #ifdef CONFIG_PM_SLEEP
140 
141 static int pxa2xx_ac97_do_suspend(struct snd_card *card)
142 {
143         pxa2xx_audio_ops_t *platform_ops = card->dev->platform_data;
144 
145         snd_power_change_state(card, SNDRV_CTL_POWER_D3cold);
146         snd_pcm_suspend_all(pxa2xx_ac97_pcm);
147         snd_ac97_suspend(pxa2xx_ac97_ac97);
148         if (platform_ops && platform_ops->suspend)
149                 platform_ops->suspend(platform_ops->priv);
150 
151         return pxa2xx_ac97_hw_suspend();
152 }
153 
154 static int pxa2xx_ac97_do_resume(struct snd_card *card)
155 {
156         pxa2xx_audio_ops_t *platform_ops = card->dev->platform_data;
157         int rc;
158 
159         rc = pxa2xx_ac97_hw_resume();
160         if (rc)
161                 return rc;
162 
163         if (platform_ops && platform_ops->resume)
164                 platform_ops->resume(platform_ops->priv);
165         snd_ac97_resume(pxa2xx_ac97_ac97);
166         snd_power_change_state(card, SNDRV_CTL_POWER_D0);
167 
168         return 0;
169 }
170 
171 static int pxa2xx_ac97_suspend(struct device *dev)
172 {
173         struct snd_card *card = dev_get_drvdata(dev);
174         int ret = 0;
175 
176         if (card)
177                 ret = pxa2xx_ac97_do_suspend(card);
178 
179         return ret;
180 }
181 
182 static int pxa2xx_ac97_resume(struct device *dev)
183 {
184         struct snd_card *card = dev_get_drvdata(dev);
185         int ret = 0;
186 
187         if (card)
188                 ret = pxa2xx_ac97_do_resume(card);
189 
190         return ret;
191 }
192 
193 static SIMPLE_DEV_PM_OPS(pxa2xx_ac97_pm_ops, pxa2xx_ac97_suspend, pxa2xx_ac97_resume);
194 #endif
195 
196 static int pxa2xx_ac97_probe(struct platform_device *dev)
197 {
198         struct snd_card *card;
199         struct snd_ac97_bus *ac97_bus;
200         struct snd_ac97_template ac97_template;
201         int ret;
202         pxa2xx_audio_ops_t *pdata = dev->dev.platform_data;
203 
204         if (dev->id >= 0) {
205                 dev_err(&dev->dev, "PXA2xx has only one AC97 port.\n");
206                 ret = -ENXIO;
207                 goto err_dev;
208         }
209 
210         ret = snd_card_new(&dev->dev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
211                            THIS_MODULE, 0, &card);
212         if (ret < 0)
213                 goto err;
214 
215         strlcpy(card->driver, dev->dev.driver->name, sizeof(card->driver));
216 
217         ret = pxa2xx_pcm_new(card, &pxa2xx_ac97_pcm_client, &pxa2xx_ac97_pcm);
218         if (ret)
219                 goto err;
220 
221         ret = pxa2xx_ac97_hw_probe(dev);
222         if (ret)
223                 goto err;
224 
225         ret = snd_ac97_bus(card, 0, &pxa2xx_ac97_ops, NULL, &ac97_bus);
226         if (ret)
227                 goto err_remove;
228         memset(&ac97_template, 0, sizeof(ac97_template));
229         ret = snd_ac97_mixer(ac97_bus, &ac97_template, &pxa2xx_ac97_ac97);
230         if (ret)
231                 goto err_remove;
232 
233         snprintf(card->shortname, sizeof(card->shortname),
234                  "%s", snd_ac97_get_short_name(pxa2xx_ac97_ac97));
235         snprintf(card->longname, sizeof(card->longname),
236                  "%s (%s)", dev->dev.driver->name, card->mixername);
237 
238         if (pdata && pdata->codec_pdata[0])
239                 snd_ac97_dev_add_pdata(ac97_bus->codec[0], pdata->codec_pdata[0]);
240         ret = snd_card_register(card);
241         if (ret == 0) {
242                 platform_set_drvdata(dev, card);
243                 return 0;
244         }
245 
246 err_remove:
247         pxa2xx_ac97_hw_remove(dev);
248 err:
249         if (card)
250                 snd_card_free(card);
251 err_dev:
252         return ret;
253 }
254 
255 static int pxa2xx_ac97_remove(struct platform_device *dev)
256 {
257         struct snd_card *card = platform_get_drvdata(dev);
258 
259         if (card) {
260                 snd_card_free(card);
261                 pxa2xx_ac97_hw_remove(dev);
262         }
263 
264         return 0;
265 }
266 
267 static struct platform_driver pxa2xx_ac97_driver = {
268         .probe          = pxa2xx_ac97_probe,
269         .remove         = pxa2xx_ac97_remove,
270         .driver         = {
271                 .name   = "pxa2xx-ac97",
272 #ifdef CONFIG_PM_SLEEP
273                 .pm     = &pxa2xx_ac97_pm_ops,
274 #endif
275         },
276 };
277 
278 module_platform_driver(pxa2xx_ac97_driver);
279 
280 MODULE_AUTHOR("Nicolas Pitre");
281 MODULE_DESCRIPTION("AC97 driver for the Intel PXA2xx chip");
282 MODULE_LICENSE("GPL");
283 MODULE_ALIAS("platform:pxa2xx-ac97");
284 

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