drivers/sound/samsung_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 #include <common.h>
   8 #include <audio_codec.h>
   9 #include <dm.h>
  10 #include <i2s.h>
  11 #include <log.h>
  12 #include <sound.h>
  13 #include <asm/gpio.h>
  14 #include <asm/arch/power.h>
  15
  16 static int samsung_sound_setup(struct udevice *dev)
  17 {
  18         struct sound_uc_priv *uc_priv = dev_get_uclass_priv(dev);
  19         struct i2s_uc_priv *i2c_priv = dev_get_uclass_priv(uc_priv->i2s);
  20         int ret;
  21
  22         if (uc_priv->setup_done)
  23                 return -EALREADY;
  24         ret = audio_codec_set_params(uc_priv->codec, i2c_priv->id,
  25                                      i2c_priv->samplingrate,
  26                                      i2c_priv->samplingrate * i2c_priv->rfs,
  27                                      i2c_priv->bitspersample,
  28                                      i2c_priv->channels);
  29         if (ret)
  30                 return ret;
  31         uc_priv->setup_done = true;
  32
  33         return 0;
  34 }
  35
  36 static int samsung_sound_play(struct udevice *dev, void *data, uint data_size)
  37 {
  38         struct sound_uc_priv *uc_priv = dev_get_uclass_priv(dev);
  39
  40         return i2s_tx_data(uc_priv->i2s, data, data_size);
  41 }
  42
  43 static int samsung_sound_probe(struct udevice *dev)
  44 {
  45         struct sound_uc_priv *uc_priv = dev_get_uclass_priv(dev);
  46         struct ofnode_phandle_args args;
  47         struct gpio_desc en_gpio;
  48         ofnode node;
  49         int ret;
  50
  51         ret = gpio_request_by_name(dev, "codec-enable-gpio", 0, &en_gpio,
  52                                    GPIOD_IS_OUT | GPIOD_IS_OUT_ACTIVE);
  53
  54         /* Turn on the GPIO which connects to the codec's "enable" line. */
  55         if (!ret)
  56                 gpio_set_pull(gpio_get_number(&en_gpio), S5P_GPIO_PULL_NONE);
  57
  58         ret = uclass_get_device_by_phandle(UCLASS_AUDIO_CODEC, dev,
  59                                            "samsung,audio-codec",
  60                                            &uc_priv->codec);
  61         if (ret) {
  62                 debug("Failed to probe audio codec\n");
  63                 return ret;
  64         }
  65         node = ofnode_find_subnode(dev_ofnode(dev), "cpu");
  66         if (!ofnode_valid(node)) {
  67                 debug("Failed to find /cpu subnode\n");
  68                 return -EINVAL;
  69         }
  70         ret = ofnode_parse_phandle_with_args(node, "sound-dai",
  71                                              "#sound-dai-cells", 0, 0, &args);
  72         if (ret) {
  73                 debug("Cannot find phandle: %d\n", ret);
  74                 return ret;
  75         }
  76         ret = uclass_get_device_by_ofnode(UCLASS_I2S, args.node, &uc_priv->i2s);
  77         if (ret) {
  78                 debug("Cannot find i2s: %d\n", ret);
  79                 return ret;
  80         }
  81         debug("Probed sound '%s' with codec '%s' and i2s '%s'\n", dev->name,
  82               uc_priv->codec->name, uc_priv->i2s->name);
  83
  84         /* Enable codec clock */
  85         set_xclkout();
  86
  87         return 0;
  88 }
  89
  90 static const struct sound_ops samsung_sound_ops = {
  91         .setup  = samsung_sound_setup,
  92         .play   = samsung_sound_play,
  93 };
  94
  95 static const struct udevice_id samsung_sound_ids[] = {
  96         { .compatible = "google,snow-audio-max98095" },
  97         { .compatible = "google,spring-audio-max98088" },
  98         { .compatible = "samsung,smdk5420-audio-wm8994" },
  99         { .compatible = "google,peach-audio-max98090" },
 100         { }
 101 };
 102
 103 U_BOOT_DRIVER(samsung_sound) = {
 104         .name           = "samsung_sound",
 105         .id             = UCLASS_SOUND,
 106         .of_match       = samsung_sound_ids,
 107         .probe          = samsung_sound_probe,
 108         .ops            = &samsung_sound_ops,
 109 };