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 <log.h>
  14 #include <misc.h>
  15 #include <sound.h>
  16 #include <asm/gpio.h>
  17 #include "tegra_i2s_priv.h"
  18
  19 static int tegra_sound_setup(struct udevice *dev)
  20 {
  21         struct sound_uc_priv *uc_priv = dev_get_uclass_priv(dev);
  22         struct i2s_uc_priv *i2c_priv = dev_get_uclass_priv(uc_priv->i2s);
  23         int ret;
  24
  25         if (uc_priv->setup_done)
  26                 return -EALREADY;
  27         ret = audio_codec_set_params(uc_priv->codec, i2c_priv->id,
  28                                      i2c_priv->samplingrate,
  29                                      i2c_priv->samplingrate * i2c_priv->rfs,
  30                                      i2c_priv->bitspersample,
  31                                      i2c_priv->channels);
  32         if (ret)
  33                 return ret;
  34         uc_priv->setup_done = true;
  35
  36         return 0;
  37 }
  38
  39 static int tegra_sound_play(struct udevice *dev, void *data, uint data_size)
  40 {
  41         struct sound_uc_priv *uc_priv = dev_get_uclass_priv(dev);
  42
  43         return i2s_tx_data(uc_priv->i2s, data, data_size);
  44 }
  45
  46 static int tegra_sound_probe(struct udevice *dev)
  47 {
  48         struct sound_uc_priv *uc_priv = dev_get_uclass_priv(dev);
  49         struct gpio_desc en_gpio;
  50         struct udevice *ahub;
  51         int ret;
  52
  53         ret = gpio_request_by_name(dev, "codec-enable-gpio", 0, &en_gpio,
  54                                    GPIOD_IS_OUT | GPIOD_IS_OUT_ACTIVE);
  55
  56         ret = uclass_get_device_by_phandle(UCLASS_AUDIO_CODEC, dev,
  57                                            "nvidia,audio-codec",
  58                                            &uc_priv->codec);
  59         if (ret) {
  60                 log_debug("Failed to probe audio codec\n");
  61                 return ret;
  62         }
  63         ret = uclass_get_device_by_phandle(UCLASS_I2S, dev,
  64                                            "nvidia,i2s-controller",
  65                                            &uc_priv->i2s);
  66         if (ret) {
  67                 log_debug("Cannot find i2s: %d\n", ret);
  68                 return ret;
  69         }
  70
  71         /* Set up the audio hub, telling it the currect i2s to use */
  72         ahub = dev_get_parent(uc_priv->i2s);
  73         ret = misc_ioctl(ahub, AHUB_MISCOP_SET_I2S, &uc_priv->i2s);
  74         if (ret) {
  75                 log_debug("Cannot set i2c: %d\n", ret);
  76                 return ret;
  77         }
  78
  79         log_debug("Probed sound '%s' with codec '%s' and i2s '%s'\n", dev->name,
  80                   uc_priv->codec->name, uc_priv->i2s->name);
  81
  82         return 0;
  83 }
  84
  85 static const struct sound_ops tegra_sound_ops = {
  86         .setup  = tegra_sound_setup,
  87         .play   = tegra_sound_play,
  88 };
  89
  90 static const struct udevice_id tegra_sound_ids[] = {
  91         { .compatible = "nvidia,tegra-audio-max98090-nyan-big" },
  92         { }
  93 };
  94
  95 U_BOOT_DRIVER(tegra_sound) = {
  96         .name           = "tegra_sound",
  97         .id             = UCLASS_SOUND,
  98         .of_match       = tegra_sound_ids,
  99         .probe          = tegra_sound_probe,
 100         .ops            = &tegra_sound_ops,
 101 };