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_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 const struct snd_pcm_ops pxa2xx_ac97_pcm_ops = {
 178         .open           = pxa2xx_ac97_pcm_open,
 179         .close          = pxa2xx_ac97_pcm_close,
 180         .ioctl          = snd_pcm_lib_ioctl,
 181         .hw_params      = pxa2xx_pcm_hw_params,
 182         .hw_free        = pxa2xx_pcm_hw_free,
 183         .prepare        = pxa2xx_ac97_pcm_prepare,
 184         .trigger        = pxa2xx_pcm_trigger,
 185         .pointer        = pxa2xx_pcm_pointer,
 186         .mmap           = pxa2xx_pcm_mmap,
 187 };
 188
 189
 190 static int pxa2xx_ac97_pcm_new(struct snd_card *card)
 191 {
 192         struct snd_pcm *pcm;
 193         int stream, ret;
 194
 195         ret = snd_pcm_new(card, "PXA2xx-PCM", 0, 1, 1, &pcm);
 196         if (ret)
 197                 goto out;
 198
 199         pcm->private_free = pxa2xx_pcm_free_dma_buffers;
 200
 201         ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
 202         if (ret)
 203                 goto out;
 204
 205         stream = SNDRV_PCM_STREAM_PLAYBACK;
 206         snd_pcm_set_ops(pcm, stream, &pxa2xx_ac97_pcm_ops);
 207         ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, stream);
 208         if (ret)
 209                 goto out;
 210
 211         stream = SNDRV_PCM_STREAM_CAPTURE;
 212         snd_pcm_set_ops(pcm, stream, &pxa2xx_ac97_pcm_ops);
 213         ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, stream);
 214         if (ret)
 215                 goto out;
 216
 217         pxa2xx_ac97_pcm = pcm;
 218         ret = 0;
 219
 220  out:
 221         return ret;
 222 }
 223
 224 static int pxa2xx_ac97_probe(struct platform_device *dev)
 225 {
 226         struct snd_card *card;
 227         struct snd_ac97_bus *ac97_bus;
 228         struct snd_ac97_template ac97_template;
 229         int ret;
 230         pxa2xx_audio_ops_t *pdata = dev->dev.platform_data;
 231
 232         if (dev->id >= 0) {
 233                 dev_err(&dev->dev, "PXA2xx has only one AC97 port.\n");
 234                 ret = -ENXIO;
 235                 goto err_dev;
 236         }
 237
 238         ret = snd_card_new(&dev->dev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
 239                            THIS_MODULE, 0, &card);
 240         if (ret < 0)
 241                 goto err;
 242
 243         strlcpy(card->driver, dev->dev.driver->name, sizeof(card->driver));
 244
 245         ret = pxa2xx_ac97_pcm_new(card);
 246         if (ret)
 247                 goto err;
 248
 249         ret = pxa2xx_ac97_hw_probe(dev);
 250         if (ret)
 251                 goto err;
 252
 253         ret = snd_ac97_bus(card, 0, &pxa2xx_ac97_ops, NULL, &ac97_bus);
 254         if (ret)
 255                 goto err_remove;
 256         memset(&ac97_template, 0, sizeof(ac97_template));
 257         ret = snd_ac97_mixer(ac97_bus, &ac97_template, &pxa2xx_ac97_ac97);
 258         if (ret)
 259                 goto err_remove;
 260
 261         snprintf(card->shortname, sizeof(card->shortname),
 262                  "%s", snd_ac97_get_short_name(pxa2xx_ac97_ac97));
 263         snprintf(card->longname, sizeof(card->longname),
 264                  "%s (%s)", dev->dev.driver->name, card->mixername);
 265
 266         if (pdata && pdata->codec_pdata[0])
 267                 snd_ac97_dev_add_pdata(ac97_bus->codec[0], pdata->codec_pdata[0]);
 268         ret = snd_card_register(card);
 269         if (ret == 0) {
 270                 platform_set_drvdata(dev, card);
 271                 return 0;
 272         }
 273
 274 err_remove:
 275         pxa2xx_ac97_hw_remove(dev);
 276 err:
 277         if (card)
 278                 snd_card_free(card);
 279 err_dev:
 280         return ret;
 281 }
 282
 283 static int pxa2xx_ac97_remove(struct platform_device *dev)
 284 {
 285         struct snd_card *card = platform_get_drvdata(dev);
 286
 287         if (card) {
 288                 snd_card_free(card);
 289                 pxa2xx_ac97_hw_remove(dev);
 290         }
 291
 292         return 0;
 293 }
 294
 295 static struct platform_driver pxa2xx_ac97_driver = {
 296         .probe          = pxa2xx_ac97_probe,
 297         .remove         = pxa2xx_ac97_remove,
 298         .driver         = {
 299                 .name   = "pxa2xx-ac97",
 300 #ifdef CONFIG_PM_SLEEP
 301                 .pm     = &pxa2xx_ac97_pm_ops,
 302 #endif
 303         },
 304 };
 305
 306 module_platform_driver(pxa2xx_ac97_driver);
 307
 308 MODULE_AUTHOR("Nicolas Pitre");
 309 MODULE_DESCRIPTION("AC97 driver for the Intel PXA2xx chip");
 310 MODULE_LICENSE("GPL");
 311 MODULE_ALIAS("platform:pxa2xx-ac97");