dm: sound: Create a uclass for i2s
The i2s bus is commonly used with audio codecs. It provides a way to
stream digital data sychronously in both directions. U-Boot only supports
audio output, so this uclass is very simple, with a single tx_data()
method.
Add a uclass and a test for i2s.
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/sound/Makefile b/drivers/sound/Makefile
index ae5fabe..4aced9d 100644
--- a/drivers/sound/Makefile
+++ b/drivers/sound/Makefile
@@ -5,6 +5,7 @@
obj-$(CONFIG_SOUND) += sound.o
obj-$(CONFIG_DM_SOUND) += codec-uclass.o
+obj-$(CONFIG_DM_SOUND) += i2s-uclass.o
obj-$(CONFIG_I2S) += sound-i2s.o
obj-$(CONFIG_I2S_SAMSUNG) += samsung-i2s.o
obj-$(CONFIG_SOUND_SANDBOX) += sandbox.o
diff --git a/drivers/sound/i2s-uclass.c b/drivers/sound/i2s-uclass.c
new file mode 100644
index 0000000..b741e39
--- /dev/null
+++ b/drivers/sound/i2s-uclass.c
@@ -0,0 +1,25 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2018 Google LLC
+ * Written by Simon Glass <sjg@chromium.org>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <i2s.h>
+
+int i2s_tx_data(struct udevice *dev, void *data, uint data_size)
+{
+ struct i2s_ops *ops = i2s_get_ops(dev);
+
+ if (!ops->tx_data)
+ return -ENOSYS;
+
+ return ops->tx_data(dev, data, data_size);
+}
+
+UCLASS_DRIVER(i2s) = {
+ .id = UCLASS_I2S,
+ .name = "i2s",
+ .per_device_auto_alloc_size = sizeof(struct i2s_uc_priv),
+};
diff --git a/drivers/sound/sandbox.c b/drivers/sound/sandbox.c
index d24eb9a..2f7c68b 100644
--- a/drivers/sound/sandbox.c
+++ b/drivers/sound/sandbox.c
@@ -4,8 +4,9 @@
*/
#include <common.h>
-#include <dm.h>
#include <audio_codec.h>
+#include <dm.h>
+#include <i2s.h>
#include <asm/sound.h>
#include <asm/sdl.h>
@@ -17,6 +18,10 @@
uint channels;
};
+struct sandbox_i2s_priv {
+ int sum; /* Use to sum the provided audio data */
+};
+
int sound_play(uint32_t msec, uint32_t frequency)
{
sandbox_sdl_sound_start(frequency);
@@ -44,6 +49,13 @@
*channelsp = priv->channels;
}
+int sandbox_get_i2s_sum(struct udevice *dev)
+{
+ struct sandbox_i2s_priv *priv = dev_get_priv(dev);
+
+ return priv->sum;
+}
+
static int sandbox_codec_set_params(struct udevice *dev, int interface,
int rate, int mclk_freq,
int bits_per_sample, uint channels)
@@ -59,6 +71,34 @@
return 0;
}
+static int sandbox_i2s_tx_data(struct udevice *dev, void *data,
+ uint data_size)
+{
+ struct sandbox_i2s_priv *priv = dev_get_priv(dev);
+ int i;
+
+ for (i = 0; i < data_size; i++)
+ priv->sum += ((uint8_t *)data)[i];
+
+ return 0;
+}
+
+static int sandbox_i2s_probe(struct udevice *dev)
+{
+ struct i2s_uc_priv *uc_priv = dev_get_uclass_priv(dev);
+
+ /* Use hard-coded values here */
+ uc_priv->rfs = 256;
+ uc_priv->bfs = 32;
+ uc_priv->audio_pll_clk = 192000000;
+ uc_priv->samplingrate = 48000;
+ uc_priv->bitspersample = 16;
+ uc_priv->channels = 2;
+ uc_priv->id = 1;
+
+ return 0;
+}
+
static const struct audio_codec_ops sandbox_codec_ops = {
.set_params = sandbox_codec_set_params,
};
@@ -75,3 +115,21 @@
.ops = &sandbox_codec_ops,
.priv_auto_alloc_size = sizeof(struct sandbox_codec_priv),
};
+
+static const struct i2s_ops sandbox_i2s_ops = {
+ .tx_data = sandbox_i2s_tx_data,
+};
+
+static const struct udevice_id sandbox_i2s_ids[] = {
+ { .compatible = "sandbox,i2s" },
+ { }
+};
+
+U_BOOT_DRIVER(sandbox_i2s) = {
+ .name = "sandbox_i2s",
+ .id = UCLASS_I2S,
+ .of_match = sandbox_i2s_ids,
+ .ops = &sandbox_i2s_ops,
+ .probe = sandbox_i2s_probe,
+ .priv_auto_alloc_size = sizeof(struct sandbox_i2s_priv),
+};