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Linux/sound/arm/pxa2xx-ac97.c

  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_reset(struct snd_ac97 *ac97)
 33 {
 34         if (!pxa2xx_ac97_try_cold_reset(ac97)) {
 35                 pxa2xx_ac97_try_warm_reset(ac97);
 36         }
 37 
 38         pxa2xx_ac97_finish_reset(ac97);
 39 }
 40 
 41 static struct snd_ac97_bus_ops pxa2xx_ac97_ops = {
 42         .read   = pxa2xx_ac97_read,
 43         .write  = pxa2xx_ac97_write,
 44         .reset  = pxa2xx_ac97_reset,
 45 };
 46 
 47 static struct pxad_param pxa2xx_ac97_pcm_out_req = {
 48         .prio = PXAD_PRIO_LOWEST,
 49         .drcmr = 12,
 50 };
 51 
 52 static struct snd_dmaengine_dai_dma_data pxa2xx_ac97_pcm_out = {
 53         .addr           = __PREG(PCDR),
 54         .addr_width     = DMA_SLAVE_BUSWIDTH_4_BYTES,
 55         .maxburst       = 32,
 56         .filter_data    = &pxa2xx_ac97_pcm_out_req,
 57 };
 58 
 59 static struct pxad_param pxa2xx_ac97_pcm_in_req = {
 60         .prio = PXAD_PRIO_LOWEST,
 61         .drcmr = 11,
 62 };
 63 
 64 static struct snd_dmaengine_dai_dma_data pxa2xx_ac97_pcm_in = {
 65         .addr           = __PREG(PCDR),
 66         .addr_width     = DMA_SLAVE_BUSWIDTH_4_BYTES,
 67         .maxburst       = 32,
 68         .filter_data    = &pxa2xx_ac97_pcm_in_req,
 69 };
 70 
 71 static struct snd_pcm *pxa2xx_ac97_pcm;
 72 static struct snd_ac97 *pxa2xx_ac97_ac97;
 73 
 74 static int pxa2xx_ac97_pcm_startup(struct snd_pcm_substream *substream)
 75 {
 76         struct snd_pcm_runtime *runtime = substream->runtime;
 77         pxa2xx_audio_ops_t *platform_ops;
 78         int r;
 79 
 80         runtime->hw.channels_min = 2;
 81         runtime->hw.channels_max = 2;
 82 
 83         r = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
 84             AC97_RATES_FRONT_DAC : AC97_RATES_ADC;
 85         runtime->hw.rates = pxa2xx_ac97_ac97->rates[r];
 86         snd_pcm_limit_hw_rates(runtime);
 87 
 88         platform_ops = substream->pcm->card->dev->platform_data;
 89         if (platform_ops && platform_ops->startup)
 90                 return platform_ops->startup(substream, platform_ops->priv);
 91         else
 92                 return 0;
 93 }
 94 
 95 static void pxa2xx_ac97_pcm_shutdown(struct snd_pcm_substream *substream)
 96 {
 97         pxa2xx_audio_ops_t *platform_ops;
 98 
 99         platform_ops = substream->pcm->card->dev->platform_data;
100         if (platform_ops && platform_ops->shutdown)
101                 platform_ops->shutdown(substream, platform_ops->priv);
102 }
103 
104 static int pxa2xx_ac97_pcm_prepare(struct snd_pcm_substream *substream)
105 {
106         struct snd_pcm_runtime *runtime = substream->runtime;
107         int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
108                   AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE;
109         return snd_ac97_set_rate(pxa2xx_ac97_ac97, reg, runtime->rate);
110 }
111 
112 static struct pxa2xx_pcm_client pxa2xx_ac97_pcm_client = {
113         .playback_params        = &pxa2xx_ac97_pcm_out,
114         .capture_params         = &pxa2xx_ac97_pcm_in,
115         .startup                = pxa2xx_ac97_pcm_startup,
116         .shutdown               = pxa2xx_ac97_pcm_shutdown,
117         .prepare                = pxa2xx_ac97_pcm_prepare,
118 };
119 
120 #ifdef CONFIG_PM_SLEEP
121 
122 static int pxa2xx_ac97_do_suspend(struct snd_card *card)
123 {
124         pxa2xx_audio_ops_t *platform_ops = card->dev->platform_data;
125 
126         snd_power_change_state(card, SNDRV_CTL_POWER_D3cold);
127         snd_pcm_suspend_all(pxa2xx_ac97_pcm);
128         snd_ac97_suspend(pxa2xx_ac97_ac97);
129         if (platform_ops && platform_ops->suspend)
130                 platform_ops->suspend(platform_ops->priv);
131 
132         return pxa2xx_ac97_hw_suspend();
133 }
134 
135 static int pxa2xx_ac97_do_resume(struct snd_card *card)
136 {
137         pxa2xx_audio_ops_t *platform_ops = card->dev->platform_data;
138         int rc;
139 
140         rc = pxa2xx_ac97_hw_resume();
141         if (rc)
142                 return rc;
143 
144         if (platform_ops && platform_ops->resume)
145                 platform_ops->resume(platform_ops->priv);
146         snd_ac97_resume(pxa2xx_ac97_ac97);
147         snd_power_change_state(card, SNDRV_CTL_POWER_D0);
148 
149         return 0;
150 }
151 
152 static int pxa2xx_ac97_suspend(struct device *dev)
153 {
154         struct snd_card *card = dev_get_drvdata(dev);
155         int ret = 0;
156 
157         if (card)
158                 ret = pxa2xx_ac97_do_suspend(card);
159 
160         return ret;
161 }
162 
163 static int pxa2xx_ac97_resume(struct device *dev)
164 {
165         struct snd_card *card = dev_get_drvdata(dev);
166         int ret = 0;
167 
168         if (card)
169                 ret = pxa2xx_ac97_do_resume(card);
170 
171         return ret;
172 }
173 
174 static SIMPLE_DEV_PM_OPS(pxa2xx_ac97_pm_ops, pxa2xx_ac97_suspend, pxa2xx_ac97_resume);
175 #endif
176 
177 static int pxa2xx_ac97_probe(struct platform_device *dev)
178 {
179         struct snd_card *card;
180         struct snd_ac97_bus *ac97_bus;
181         struct snd_ac97_template ac97_template;
182         int ret;
183         pxa2xx_audio_ops_t *pdata = dev->dev.platform_data;
184 
185         if (dev->id >= 0) {
186                 dev_err(&dev->dev, "PXA2xx has only one AC97 port.\n");
187                 ret = -ENXIO;
188                 goto err_dev;
189         }
190 
191         ret = snd_card_new(&dev->dev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
192                            THIS_MODULE, 0, &card);
193         if (ret < 0)
194                 goto err;
195 
196         strlcpy(card->driver, dev->dev.driver->name, sizeof(card->driver));
197 
198         ret = pxa2xx_pcm_new(card, &pxa2xx_ac97_pcm_client, &pxa2xx_ac97_pcm);
199         if (ret)
200                 goto err;
201 
202         ret = pxa2xx_ac97_hw_probe(dev);
203         if (ret)
204                 goto err;
205 
206         ret = snd_ac97_bus(card, 0, &pxa2xx_ac97_ops, NULL, &ac97_bus);
207         if (ret)
208                 goto err_remove;
209         memset(&ac97_template, 0, sizeof(ac97_template));
210         ret = snd_ac97_mixer(ac97_bus, &ac97_template, &pxa2xx_ac97_ac97);
211         if (ret)
212                 goto err_remove;
213 
214         snprintf(card->shortname, sizeof(card->shortname),
215                  "%s", snd_ac97_get_short_name(pxa2xx_ac97_ac97));
216         snprintf(card->longname, sizeof(card->longname),
217                  "%s (%s)", dev->dev.driver->name, card->mixername);
218 
219         if (pdata && pdata->codec_pdata[0])
220                 snd_ac97_dev_add_pdata(ac97_bus->codec[0], pdata->codec_pdata[0]);
221         ret = snd_card_register(card);
222         if (ret == 0) {
223                 platform_set_drvdata(dev, card);
224                 return 0;
225         }
226 
227 err_remove:
228         pxa2xx_ac97_hw_remove(dev);
229 err:
230         if (card)
231                 snd_card_free(card);
232 err_dev:
233         return ret;
234 }
235 
236 static int pxa2xx_ac97_remove(struct platform_device *dev)
237 {
238         struct snd_card *card = platform_get_drvdata(dev);
239 
240         if (card) {
241                 snd_card_free(card);
242                 pxa2xx_ac97_hw_remove(dev);
243         }
244 
245         return 0;
246 }
247 
248 static struct platform_driver pxa2xx_ac97_driver = {
249         .probe          = pxa2xx_ac97_probe,
250         .remove         = pxa2xx_ac97_remove,
251         .driver         = {
252                 .name   = "pxa2xx-ac97",
253 #ifdef CONFIG_PM_SLEEP
254                 .pm     = &pxa2xx_ac97_pm_ops,
255 #endif
256         },
257 };
258 
259 module_platform_driver(pxa2xx_ac97_driver);
260 
261 MODULE_AUTHOR("Nicolas Pitre");
262 MODULE_DESCRIPTION("AC97 driver for the Intel PXA2xx chip");
263 MODULE_LICENSE("GPL");
264 MODULE_ALIAS("platform:pxa2xx-ac97");
265 

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