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_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");