drivers/sound/tegra_sound.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright 2018 Google, LLC
   4  * Written by Simon Glass <sjg@chromium.org>
   5  */
   6
   7 #define LOG_CATEGORY UCLASS_I2S
   8
   9 #include <common.h>
  10 #include <audio_codec.h>
  11 #include <dm.h>
  12 #include <i2s.h>
  13 #include <misc.h>
  14 #include <sound.h>
  15 #include <asm/gpio.h>
  16 #include "tegra_i2s_priv.h"
  17
  18 static int tegra_sound_setup(struct udevice *dev)
  19 {
  20         struct sound_uc_priv *uc_priv = dev_get_uclass_priv(dev);
  21         struct i2s_uc_priv *i2c_priv = dev_get_uclass_priv(uc_priv->i2s);
  22         int ret;
  23
  24         if (uc_priv->setup_done)
  25                 return -EALREADY;
  26         ret = audio_codec_set_params(uc_priv->codec, i2c_priv->id,
  27                                      i2c_priv->samplingrate,
  28                                      i2c_priv->samplingrate * i2c_priv->rfs,
  29                                      i2c_priv->bitspersample,
  30                                      i2c_priv->channels);
  31         if (ret)
  32                 return ret;
  33         uc_priv->setup_done = true;
  34
  35         return 0;
  36 }
  37
  38 static int tegra_sound_play(struct udevice *dev, void *data, uint data_size)
  39 {
  40         struct sound_uc_priv *uc_priv = dev_get_uclass_priv(dev);
  41
  42         return i2s_tx_data(uc_priv->i2s, data, data_size);
  43 }
  44
  45 static int tegra_sound_probe(struct udevice *dev)
  46 {
  47         struct sound_uc_priv *uc_priv = dev_get_uclass_priv(dev);
  48         struct gpio_desc en_gpio;
  49         struct udevice *ahub;
  50         int ret;
  51
  52         ret = gpio_request_by_name(dev, "codec-enable-gpio", 0, &en_gpio,
  53                                    GPIOD_IS_OUT | GPIOD_IS_OUT_ACTIVE);
  54
  55         ret = uclass_get_device_by_phandle(UCLASS_AUDIO_CODEC, dev,
  56                                            "nvidia,audio-codec",
  57                                            &uc_priv->codec);
  58         if (ret) {
  59                 log_debug("Failed to probe audio codec\n");
  60                 return ret;
  61         }
  62         ret = uclass_get_device_by_phandle(UCLASS_I2S, dev,
  63                                            "nvidia,i2s-controller",
  64                                            &uc_priv->i2s);
  65         if (ret) {
  66                 log_debug("Cannot find i2s: %d\n", ret);
  67                 return ret;
  68         }
  69
  70         /* Set up the audio hub, telling it the currect i2s to use */
  71         ahub = dev_get_parent(uc_priv->i2s);
  72         ret = misc_ioctl(ahub, AHUB_MISCOP_SET_I2S, &uc_priv->i2s);
  73         if (ret) {
  74                 log_debug("Cannot set i2c: %d\n", ret);
  75                 return ret;
  76         }
  77
  78         log_debug("Probed sound '%s' with codec '%s' and i2s '%s'\n", dev->name,
  79                   uc_priv->codec->name, uc_priv->i2s->name);
  80
  81         return 0;
  82 }
  83
  84 static const struct sound_ops tegra_sound_ops = {
  85         .setup  = tegra_sound_setup,
  86         .play   = tegra_sound_play,
  87 };
  88
  89 static const struct udevice_id tegra_sound_ids[] = {
  90         { .compatible = "nvidia,tegra-audio-max98090-nyan-big" },
  91         { }
  92 };
  93
  94 U_BOOT_DRIVER(tegra_sound) = {
  95         .name           = "tegra_sound",
  96         .id             = UCLASS_SOUND,
  97         .of_match       = tegra_sound_ids,
  98         .probe          = tegra_sound_probe,
  99         .ops            = &tegra_sound_ops,
 100 };