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-mapping.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 static void pxa2xx_ac97_legacy_reset(struct snd_ac97 *ac97)
  31 {
  32         if (!pxa2xx_ac97_try_cold_reset())
  33                 pxa2xx_ac97_try_warm_reset();
  34
  35         pxa2xx_ac97_finish_reset();
  36 }
  37
  38 static unsigned short pxa2xx_ac97_legacy_read(struct snd_ac97 *ac97,
  39                                               unsigned short reg)
  40 {
  41         int ret;
  42
  43         ret = pxa2xx_ac97_read(ac97->num, reg);
  44         if (ret < 0)
  45                 return 0;
  46         else
  47                 return (unsigned short)(ret & 0xffff);
  48 }
  49
  50 static void pxa2xx_ac97_legacy_write(struct snd_ac97 *ac97,
  51                                      unsigned short reg, unsigned short val)
  52 {
  53         int __always_unused ret;
  54
  55         ret = pxa2xx_ac97_write(ac97->num, reg, val);
  56 }
  57
  58 static struct snd_ac97_bus_ops pxa2xx_ac97_ops = {
  59         .read   = pxa2xx_ac97_legacy_read,
  60         .write  = pxa2xx_ac97_legacy_write,
  61         .reset  = pxa2xx_ac97_legacy_reset,
  62 };
  63
  64 static struct snd_pcm *pxa2xx_ac97_pcm;
  65 static struct snd_ac97 *pxa2xx_ac97_ac97;
  66
  67 static int pxa2xx_ac97_pcm_open(struct snd_pcm_substream *substream)
  68 {
  69         struct snd_pcm_runtime *runtime = substream->runtime;
  70         pxa2xx_audio_ops_t *platform_ops;
  71         int ret, i;
  72
  73         ret = pxa2xx_pcm_open(substream);
  74         if (ret)
  75                 return ret;
  76
  77         runtime->hw.channels_min = 2;
  78         runtime->hw.channels_max = 2;
  79
  80         i = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
  81                 AC97_RATES_FRONT_DAC : AC97_RATES_ADC;
  82         runtime->hw.rates = pxa2xx_ac97_ac97->rates[i];
  83         snd_pcm_limit_hw_rates(runtime);
  84
  85         platform_ops = substream->pcm->card->dev->platform_data;
  86         if (platform_ops && platform_ops->startup) {
  87                 ret = platform_ops->startup(substream, platform_ops->priv);
  88                 if (ret < 0)
  89                         pxa2xx_pcm_close(substream);
  90         }
  91
  92         return ret;
  93 }
  94
  95 static int pxa2xx_ac97_pcm_close(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         return 0;
 104 }
 105
 106 static int pxa2xx_ac97_pcm_prepare(struct snd_pcm_substream *substream)
 107 {
 108         struct snd_pcm_runtime *runtime = substream->runtime;
 109         int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
 110                   AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE;
 111         int ret;
 112
 113         ret = pxa2xx_pcm_prepare(substream);
 114         if (ret < 0)
 115                 return ret;
 116
 117         return snd_ac97_set_rate(pxa2xx_ac97_ac97, reg, runtime->rate);
 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_ac97_suspend(pxa2xx_ac97_ac97);
 128         if (platform_ops && platform_ops->suspend)
 129                 platform_ops->suspend(platform_ops->priv);
 130
 131         return pxa2xx_ac97_hw_suspend();
 132 }
 133
 134 static int pxa2xx_ac97_do_resume(struct snd_card *card)
 135 {
 136         pxa2xx_audio_ops_t *platform_ops = card->dev->platform_data;
 137         int rc;
 138
 139         rc = pxa2xx_ac97_hw_resume();
 140         if (rc)
 141                 return rc;
 142
 143         if (platform_ops && platform_ops->resume)
 144                 platform_ops->resume(platform_ops->priv);
 145         snd_ac97_resume(pxa2xx_ac97_ac97);
 146         snd_power_change_state(card, SNDRV_CTL_POWER_D0);
 147
 148         return 0;
 149 }
 150
 151 static int pxa2xx_ac97_suspend(struct device *dev)
 152 {
 153         struct snd_card *card = dev_get_drvdata(dev);
 154         int ret = 0;
 155
 156         if (card)
 157                 ret = pxa2xx_ac97_do_suspend(card);
 158
 159         return ret;
 160 }
 161
 162 static int pxa2xx_ac97_resume(struct device *dev)
 163 {
 164         struct snd_card *card = dev_get_drvdata(dev);
 165         int ret = 0;
 166
 167         if (card)
 168                 ret = pxa2xx_ac97_do_resume(card);
 169
 170         return ret;
 171 }
 172
 173 static SIMPLE_DEV_PM_OPS(pxa2xx_ac97_pm_ops, pxa2xx_ac97_suspend, pxa2xx_ac97_resume);
 174 #endif
 175
 176 static const struct snd_pcm_ops pxa2xx_ac97_pcm_ops = {
 177         .open           = pxa2xx_ac97_pcm_open,
 178         .close          = pxa2xx_ac97_pcm_close,
 179         .ioctl          = snd_pcm_lib_ioctl,
 180         .hw_params      = pxa2xx_pcm_hw_params,
 181         .hw_free        = pxa2xx_pcm_hw_free,
 182         .prepare        = pxa2xx_ac97_pcm_prepare,
 183         .trigger        = pxa2xx_pcm_trigger,
 184         .pointer        = pxa2xx_pcm_pointer,
 185         .mmap           = pxa2xx_pcm_mmap,
 186 };
 187
 188
 189 static int pxa2xx_ac97_pcm_new(struct snd_card *card)
 190 {
 191         struct snd_pcm *pcm;
 192         int stream, ret;
 193
 194         ret = snd_pcm_new(card, "PXA2xx-PCM", 0, 1, 1, &pcm);
 195         if (ret)
 196                 goto out;
 197
 198         pcm->private_free = pxa2xx_pcm_free_dma_buffers;
 199
 200         ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
 201         if (ret)
 202                 goto out;
 203
 204         stream = SNDRV_PCM_STREAM_PLAYBACK;
 205         snd_pcm_set_ops(pcm, stream, &pxa2xx_ac97_pcm_ops);
 206         ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, stream);
 207         if (ret)
 208                 goto out;
 209
 210         stream = SNDRV_PCM_STREAM_CAPTURE;
 211         snd_pcm_set_ops(pcm, stream, &pxa2xx_ac97_pcm_ops);
 212         ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, stream);
 213         if (ret)
 214                 goto out;
 215
 216         pxa2xx_ac97_pcm = pcm;
 217         ret = 0;
 218
 219  out:
 220         return ret;
 221 }
 222
 223 static int pxa2xx_ac97_probe(struct platform_device *dev)
 224 {
 225         struct snd_card *card;
 226         struct snd_ac97_bus *ac97_bus;
 227         struct snd_ac97_template ac97_template;
 228         int ret;
 229         pxa2xx_audio_ops_t *pdata = dev->dev.platform_data;
 230
 231         if (dev->id >= 0) {
 232                 dev_err(&dev->dev, "PXA2xx has only one AC97 port.\n");
 233                 ret = -ENXIO;
 234                 goto err_dev;
 235         }
 236
 237         ret = snd_card_new(&dev->dev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
 238                            THIS_MODULE, 0, &card);
 239         if (ret < 0)
 240                 goto err;
 241
 242         strlcpy(card->driver, dev->dev.driver->name, sizeof(card->driver));
 243
 244         ret = pxa2xx_ac97_pcm_new(card);
 245         if (ret)
 246                 goto err;
 247
 248         ret = pxa2xx_ac97_hw_probe(dev);
 249         if (ret)
 250                 goto err;
 251
 252         ret = snd_ac97_bus(card, 0, &pxa2xx_ac97_ops, NULL, &ac97_bus);
 253         if (ret)
 254                 goto err_remove;
 255         memset(&ac97_template, 0, sizeof(ac97_template));
 256         ret = snd_ac97_mixer(ac97_bus, &ac97_template, &pxa2xx_ac97_ac97);
 257         if (ret)
 258                 goto err_remove;
 259
 260         snprintf(card->shortname, sizeof(card->shortname),
 261                  "%s", snd_ac97_get_short_name(pxa2xx_ac97_ac97));
 262         snprintf(card->longname, sizeof(card->longname),
 263                  "%s (%s)", dev->dev.driver->name, card->mixername);
 264
 265         if (pdata && pdata->codec_pdata[0])
 266                 snd_ac97_dev_add_pdata(ac97_bus->codec[0], pdata->codec_pdata[0]);
 267         ret = snd_card_register(card);
 268         if (ret == 0) {
 269                 platform_set_drvdata(dev, card);
 270                 return 0;
 271         }
 272
 273 err_remove:
 274         pxa2xx_ac97_hw_remove(dev);
 275 err:
 276         if (card)
 277                 snd_card_free(card);
 278 err_dev:
 279         return ret;
 280 }
 281
 282 static int pxa2xx_ac97_remove(struct platform_device *dev)
 283 {
 284         struct snd_card *card = platform_get_drvdata(dev);
 285
 286         if (card) {
 287                 snd_card_free(card);
 288                 pxa2xx_ac97_hw_remove(dev);
 289         }
 290
 291         return 0;
 292 }
 293
 294 static struct platform_driver pxa2xx_ac97_driver = {
 295         .probe          = pxa2xx_ac97_probe,
 296         .remove         = pxa2xx_ac97_remove,
 297         .driver         = {
 298                 .name   = "pxa2xx-ac97",
 299 #ifdef CONFIG_PM_SLEEP
 300                 .pm     = &pxa2xx_ac97_pm_ops,
 301 #endif
 302         },
 303 };
 304
 305 module_platform_driver(pxa2xx_ac97_driver);
 306
 307 MODULE_AUTHOR("Nicolas Pitre");
 308 MODULE_DESCRIPTION("AC97 driver for the Intel PXA2xx chip");
 309 MODULE_LICENSE("GPL");
 310 MODULE_ALIAS("platform:pxa2xx-ac97");