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