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/module.h>
  15#include <linux/platform_device.h>
  16
  17#include <sound/core.h>
  18#include <sound/pcm.h>
  19#include <sound/ac97_codec.h>
  20#include <sound/initval.h>
  21#include <sound/pxa2xx-lib.h>
  22
  23#include <mach/hardware.h>
  24#include <mach/pxa-regs.h>
  25#include <mach/regs-ac97.h>
  26#include <mach/audio.h>
  27
  28#include "pxa2xx-pcm.h"
  29
  30static void pxa2xx_ac97_reset(struct snd_ac97 *ac97)
  31{
  32        if (!pxa2xx_ac97_try_cold_reset(ac97)) {
  33                pxa2xx_ac97_try_warm_reset(ac97);
  34        }
  35
  36        pxa2xx_ac97_finish_reset(ac97);
  37}
  38
  39static struct snd_ac97_bus_ops pxa2xx_ac97_ops = {
  40        .read   = pxa2xx_ac97_read,
  41        .write  = pxa2xx_ac97_write,
  42        .reset  = pxa2xx_ac97_reset,
  43};
  44
  45static struct pxa2xx_pcm_dma_params pxa2xx_ac97_pcm_out = {
  46        .name                   = "AC97 PCM out",
  47        .dev_addr               = __PREG(PCDR),
  48        .drcmr                  = &DRCMR(12),
  49        .dcmd                   = DCMD_INCSRCADDR | DCMD_FLOWTRG |
  50                                  DCMD_BURST32 | DCMD_WIDTH4,
  51};
  52
  53static struct pxa2xx_pcm_dma_params pxa2xx_ac97_pcm_in = {
  54        .name                   = "AC97 PCM in",
  55        .dev_addr               = __PREG(PCDR),
  56        .drcmr                  = &DRCMR(11),
  57        .dcmd                   = DCMD_INCTRGADDR | DCMD_FLOWSRC |
  58                                  DCMD_BURST32 | DCMD_WIDTH4,
  59};
  60
  61static struct snd_pcm *pxa2xx_ac97_pcm;
  62static struct snd_ac97 *pxa2xx_ac97_ac97;
  63
  64static int pxa2xx_ac97_pcm_startup(struct snd_pcm_substream *substream)
  65{
  66        struct snd_pcm_runtime *runtime = substream->runtime;
  67        pxa2xx_audio_ops_t *platform_ops;
  68        int r;
  69
  70        runtime->hw.channels_min = 2;
  71        runtime->hw.channels_max = 2;
  72
  73        r = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
  74            AC97_RATES_FRONT_DAC : AC97_RATES_ADC;
  75        runtime->hw.rates = pxa2xx_ac97_ac97->rates[r];
  76        snd_pcm_limit_hw_rates(runtime);
  77
  78        platform_ops = substream->pcm->card->dev->platform_data;
  79        if (platform_ops && platform_ops->startup)
  80                return platform_ops->startup(substream, platform_ops->priv);
  81        else
  82                return 0;
  83}
  84
  85static void pxa2xx_ac97_pcm_shutdown(struct snd_pcm_substream *substream)
  86{
  87        pxa2xx_audio_ops_t *platform_ops;
  88
  89        platform_ops = substream->pcm->card->dev->platform_data;
  90        if (platform_ops && platform_ops->shutdown)
  91                platform_ops->shutdown(substream, platform_ops->priv);
  92}
  93
  94static int pxa2xx_ac97_pcm_prepare(struct snd_pcm_substream *substream)
  95{
  96        struct snd_pcm_runtime *runtime = substream->runtime;
  97        int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
  98                  AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE;
  99        return snd_ac97_set_rate(pxa2xx_ac97_ac97, reg, runtime->rate);
 100}
 101
 102static struct pxa2xx_pcm_client pxa2xx_ac97_pcm_client = {
 103        .playback_params        = &pxa2xx_ac97_pcm_out,
 104        .capture_params         = &pxa2xx_ac97_pcm_in,
 105        .startup                = pxa2xx_ac97_pcm_startup,
 106        .shutdown               = pxa2xx_ac97_pcm_shutdown,
 107        .prepare                = pxa2xx_ac97_pcm_prepare,
 108};
 109
 110#ifdef CONFIG_PM
 111
 112static int pxa2xx_ac97_do_suspend(struct snd_card *card, pm_message_t state)
 113{
 114        pxa2xx_audio_ops_t *platform_ops = card->dev->platform_data;
 115
 116        snd_power_change_state(card, SNDRV_CTL_POWER_D3cold);
 117        snd_pcm_suspend_all(pxa2xx_ac97_pcm);
 118        snd_ac97_suspend(pxa2xx_ac97_ac97);
 119        if (platform_ops && platform_ops->suspend)
 120                platform_ops->suspend(platform_ops->priv);
 121
 122        return pxa2xx_ac97_hw_suspend();
 123}
 124
 125static int pxa2xx_ac97_do_resume(struct snd_card *card)
 126{
 127        pxa2xx_audio_ops_t *platform_ops = card->dev->platform_data;
 128        int rc;
 129
 130        rc = pxa2xx_ac97_hw_resume();
 131        if (rc)
 132                return rc;
 133
 134        if (platform_ops && platform_ops->resume)
 135                platform_ops->resume(platform_ops->priv);
 136        snd_ac97_resume(pxa2xx_ac97_ac97);
 137        snd_power_change_state(card, SNDRV_CTL_POWER_D0);
 138
 139        return 0;
 140}
 141
 142static int pxa2xx_ac97_suspend(struct platform_device *dev, pm_message_t state)
 143{
 144        struct snd_card *card = platform_get_drvdata(dev);
 145        int ret = 0;
 146
 147        if (card)
 148                ret = pxa2xx_ac97_do_suspend(card, PMSG_SUSPEND);
 149
 150        return ret;
 151}
 152
 153static int pxa2xx_ac97_resume(struct platform_device *dev)
 154{
 155        struct snd_card *card = platform_get_drvdata(dev);
 156        int ret = 0;
 157
 158        if (card)
 159                ret = pxa2xx_ac97_do_resume(card);
 160
 161        return ret;
 162}
 163
 164#else
 165#define pxa2xx_ac97_suspend     NULL
 166#define pxa2xx_ac97_resume      NULL
 167#endif
 168
 169static int __devinit pxa2xx_ac97_probe(struct platform_device *dev)
 170{
 171        struct snd_card *card;
 172        struct snd_ac97_bus *ac97_bus;
 173        struct snd_ac97_template ac97_template;
 174        int ret;
 175
 176        ret = -ENOMEM;
 177        card = snd_card_new(SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
 178                            THIS_MODULE, 0);
 179        if (!card)
 180                goto err;
 181
 182        card->dev = &dev->dev;
 183        strncpy(card->driver, dev->dev.driver->name, sizeof(card->driver));
 184
 185        ret = pxa2xx_pcm_new(card, &pxa2xx_ac97_pcm_client, &pxa2xx_ac97_pcm);
 186        if (ret)
 187                goto err;
 188
 189        ret = pxa2xx_ac97_hw_probe(dev);
 190        if (ret)
 191                goto err;
 192
 193        ret = snd_ac97_bus(card, 0, &pxa2xx_ac97_ops, NULL, &ac97_bus);
 194        if (ret)
 195                goto err_remove;
 196        memset(&ac97_template, 0, sizeof(ac97_template));
 197        ret = snd_ac97_mixer(ac97_bus, &ac97_template, &pxa2xx_ac97_ac97);
 198        if (ret)
 199                goto err_remove;
 200
 201        snprintf(card->shortname, sizeof(card->shortname),
 202                 "%s", snd_ac97_get_short_name(pxa2xx_ac97_ac97));
 203        snprintf(card->longname, sizeof(card->longname),
 204                 "%s (%s)", dev->dev.driver->name, card->mixername);
 205
 206        snd_card_set_dev(card, &dev->dev);
 207        ret = snd_card_register(card);
 208        if (ret == 0) {
 209                platform_set_drvdata(dev, card);
 210                return 0;
 211        }
 212
 213err_remove:
 214        pxa2xx_ac97_hw_remove(dev);
 215err:
 216        if (card)
 217                snd_card_free(card);
 218        return ret;
 219}
 220
 221static int __devexit pxa2xx_ac97_remove(struct platform_device *dev)
 222{
 223        struct snd_card *card = platform_get_drvdata(dev);
 224
 225        if (card) {
 226                snd_card_free(card);
 227                platform_set_drvdata(dev, NULL);
 228                pxa2xx_ac97_hw_remove(dev);
 229        }
 230
 231        return 0;
 232}
 233
 234static struct platform_driver pxa2xx_ac97_driver = {
 235        .probe          = pxa2xx_ac97_probe,
 236        .remove         = __devexit_p(pxa2xx_ac97_remove),
 237        .suspend        = pxa2xx_ac97_suspend,
 238        .resume         = pxa2xx_ac97_resume,
 239        .driver         = {
 240                .name   = "pxa2xx-ac97",
 241                .owner  = THIS_MODULE,
 242        },
 243};
 244
 245static int __init pxa2xx_ac97_init(void)
 246{
 247        return platform_driver_register(&pxa2xx_ac97_driver);
 248}
 249
 250static void __exit pxa2xx_ac97_exit(void)
 251{
 252        platform_driver_unregister(&pxa2xx_ac97_driver);
 253}
 254
 255module_init(pxa2xx_ac97_init);
 256module_exit(pxa2xx_ac97_exit);
 257
 258MODULE_AUTHOR("Nicolas Pitre");
 259MODULE_DESCRIPTION("AC97 driver for the Intel PXA2xx chip");
 260MODULE_LICENSE("GPL");
 261MODULE_ALIAS("platform:pxa2xx-ac97");
 262