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-rw-r--r--testing/linux-amlogic/0007-ASoC-meson-add-initial-spdif-dai-support.patch430
1 files changed, 430 insertions, 0 deletions
diff --git a/testing/linux-amlogic/0007-ASoC-meson-add-initial-spdif-dai-support.patch b/testing/linux-amlogic/0007-ASoC-meson-add-initial-spdif-dai-support.patch
new file mode 100644
index 0000000000..c60779b465
--- /dev/null
+++ b/testing/linux-amlogic/0007-ASoC-meson-add-initial-spdif-dai-support.patch
@@ -0,0 +1,430 @@
+From 67e2a1601f80648f5c318728218b788c51081fa3 Mon Sep 17 00:00:00 2001
+From: Jerome Brunet <jbrunet@baylibre.com>
+Date: Thu, 30 Mar 2017 13:46:03 +0200
+Subject: [PATCH] ASoC: meson: add initial spdif dai support
+
+Add support for the spdif dai found on Amlogic Meson SoC family.
+With this initial implementation, only uncompressed pcm playback
+from the spdif dma is supported. Future work will add compressed
+support, pcm playback from i2s dma and capture.
+
+Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
+
+---
+ sound/soc/meson/Kconfig | 3 +-
+ sound/soc/meson/Makefile | 4 +-
+ sound/soc/meson/spdif-dai.c | 374 ++++++++++++++++++++++++++++++++++++++++++++
+ 3 files changed, 379 insertions(+), 2 deletions(-)
+ create mode 100644 sound/soc/meson/spdif-dai.c
+
+diff --git a/sound/soc/meson/Kconfig b/sound/soc/meson/Kconfig
+index 712303f..bc3d6f2 100644
+--- a/sound/soc/meson/Kconfig
++++ b/sound/soc/meson/Kconfig
+@@ -84,6 +84,7 @@ config SND_SOC_MESON_I2S
+ config SND_SOC_MESON_SPDIF
+ tristate "Meson spdif interface"
+ depends on SND_SOC_MESON
++ select SND_PCM_IEC958
+ help
+- Say Y or M if you want to add support for spdif dma driver for Amlogic
++ Say Y or M if you want to add support for spdif driver for Amlogic
+ Meson SoCs.
+diff --git a/sound/soc/meson/Makefile b/sound/soc/meson/Makefile
+index dc5164a7..44f79d8 100644
+--- a/sound/soc/meson/Makefile
++++ b/sound/soc/meson/Makefile
+@@ -24,8 +24,10 @@ snd-soc-meson-audio-core-objs := audio-core.o
+ snd-soc-meson-aiu-i2s-dma-objs := aiu-i2s-dma.o
+ snd-soc-meson-aiu-spdif-dma-objs := aiu-spdif-dma.o
+ snd-soc-meson-i2s-dai-objs := i2s-dai.o
++snd-soc-meson-spdif-dai-objs := spdif-dai.o
+
+ obj-$(CONFIG_SND_SOC_MESON) += snd-soc-meson-audio-core.o
+ obj-$(CONFIG_SND_SOC_MESON_I2S) += snd-soc-meson-aiu-i2s-dma.o
+ obj-$(CONFIG_SND_SOC_MESON_I2S) += snd-soc-meson-i2s-dai.o
+-obj-$(CONFIG_SND_SOC_MESON_SPDIF) += snd-soc-meson-aiu-spdif-dma.o
+\ No newline at end of file
++obj-$(CONFIG_SND_SOC_MESON_SPDIF) += snd-soc-meson-aiu-spdif-dma.o
++obj-$(CONFIG_SND_SOC_MESON_SPDIF) += snd-soc-meson-spdif-dai.o
+\ No newline at end of file
+diff --git a/sound/soc/meson/spdif-dai.c b/sound/soc/meson/spdif-dai.c
+new file mode 100644
+index 0000000..e763000
+--- /dev/null
++++ b/sound/soc/meson/spdif-dai.c
+@@ -0,0 +1,374 @@
++/*
++ * Copyright (C) 2017 BayLibre, SAS
++ * Author: Jerome Brunet <jbrunet@baylibre.com>
++ * Copyright (C) 2017 Amlogic, Inc. All rights reserved.
++ *
++ * This program is free software; you can redistribute it and/or
++ * modify it under the terms of the GNU General Public License as
++ * published by the Free Software Foundation; either version 2 of the
++ * License, or (at your option) any later version.
++ *
++ * This program is distributed in the hope that it will be useful, but
++ * WITHOUT ANY WARRANTY; without even the implied warranty of
++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
++ * General Public License for more details.
++ *
++ * You should have received a copy of the GNU General Public License
++ * along with this program; if not, see <http://www.gnu.org/licenses/>.
++ */
++
++#include <linux/clk.h>
++#include <linux/mfd/syscon.h>
++#include <linux/module.h>
++#include <linux/of.h>
++#include <linux/platform_device.h>
++#include <linux/regmap.h>
++
++#include <sound/pcm_params.h>
++#include <sound/soc.h>
++#include <sound/soc-dai.h>
++#include <sound/pcm_iec958.h>
++
++#include "aiu-regs.h"
++#include "audio-core.h"
++
++#define DRV_NAME "meson-spdif-dai"
++
++struct meson_spdif_dai {
++ struct meson_audio_core_data *core;
++ struct clk *iface;
++ struct clk *fast;
++ struct clk *mclk_i958;
++ struct clk *mclk;
++};
++
++#define AIU_CLK_CTRL_958_DIV_EN BIT(1)
++#define AIU_CLK_CTRL_958_DIV_MASK GENMASK(5, 4)
++#define AIU_CLK_CTRL_958_DIV_MORE BIT(12)
++#define AIU_MEM_IEC958_CONTROL_MODE_LINEAR BIT(8)
++#define AIU_958_CTRL_HOLD_EN BIT(0)
++#define AIU_958_MISC_NON_PCM BIT(0)
++#define AIU_958_MISC_MODE_16BITS BIT(1)
++#define AIU_958_MISC_16BITS_ALIGN_MASK GENMASK(6, 5)
++#define AIU_958_MISC_16BITS_ALIGN(val) ((val) << 5)
++#define AIU_958_MISC_MODE_32BITS BIT(7)
++#define AIU_958_MISC_32BITS_SHIFT_MASK GENMASK(10, 8)
++#define AIU_958_MISC_32BITS_SHIFT(val) ((val) << 8)
++#define AIU_958_MISC_U_FROM_STREAM BIT(12)
++#define AIU_958_MISC_FORCE_LR BIT(13)
++
++#define AIU_CS_WORD_LEN 4
++
++static void __hold(struct meson_spdif_dai *priv, bool enable)
++{
++ regmap_update_bits(priv->core->aiu, AIU_958_CTRL,
++ AIU_958_CTRL_HOLD_EN,
++ enable ? AIU_958_CTRL_HOLD_EN : 0);
++}
++
++static void __divider_enable(struct meson_spdif_dai *priv, bool enable)
++{
++ regmap_update_bits(priv->core->aiu, AIU_CLK_CTRL,
++ AIU_CLK_CTRL_958_DIV_EN,
++ enable ? AIU_CLK_CTRL_958_DIV_EN : 0);
++}
++
++static void __playback_start(struct meson_spdif_dai *priv)
++{
++ __divider_enable(priv, true);
++ __hold(priv, false);
++}
++
++static void __playback_stop(struct meson_spdif_dai *priv)
++{
++ __hold(priv, true);
++ __divider_enable(priv, false);
++}
++
++static int meson_spdif_dai_trigger(struct snd_pcm_substream *substream, int cmd,
++ struct snd_soc_dai *dai)
++{
++ struct meson_spdif_dai *priv = snd_soc_dai_get_drvdata(dai);
++
++ switch (cmd) {
++ case SNDRV_PCM_TRIGGER_START:
++ case SNDRV_PCM_TRIGGER_RESUME:
++ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
++ __playback_start(priv);
++ return 0;
++
++ case SNDRV_PCM_TRIGGER_STOP:
++ case SNDRV_PCM_TRIGGER_SUSPEND:
++ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
++ __playback_stop(priv);
++ return 0;
++
++ default:
++ return -EINVAL;
++ }
++}
++
++static int __setup_spdif_clk(struct meson_spdif_dai *priv, unsigned int rate)
++{
++ unsigned int mrate;
++
++ /* Leave the internal divisor alone */
++ regmap_update_bits(priv->core->aiu, AIU_CLK_CTRL,
++ AIU_CLK_CTRL_958_DIV_MASK |
++ AIU_CLK_CTRL_958_DIV_MORE,
++ 0);
++
++ /* 2 * 32bits per subframe * 2 channels = 128 */
++ mrate = rate * 128;
++ return clk_set_rate(priv->mclk, mrate);
++}
++
++static int __setup_cs_word(struct meson_spdif_dai *priv,
++ struct snd_pcm_hw_params *params)
++{
++ u8 cs[AIU_CS_WORD_LEN];
++ u32 val;
++ int ret;
++
++ ret = snd_pcm_create_iec958_consumer_hw_params(params, cs,
++ AIU_CS_WORD_LEN);
++ if (ret < 0)
++ return -EINVAL;
++
++ /* Write the 1st half word */
++ val = cs[1] | cs[0] << 8;
++ regmap_write(priv->core->aiu, AIU_958_CHSTAT_L0, val);
++ regmap_write(priv->core->aiu, AIU_958_CHSTAT_R0, val);
++
++ /* Write the 2nd half word */
++ val = cs[3] | cs[2] << 8;
++ regmap_write(priv->core->aiu, AIU_958_CHSTAT_L1, val);
++ regmap_write(priv->core->aiu, AIU_958_CHSTAT_R1, val);
++
++ return 0;
++}
++
++static int __setup_pcm_fmt(struct meson_spdif_dai *priv,
++ unsigned int width)
++{
++ u32 val = 0;
++
++ switch (width) {
++ case 16:
++ val |= AIU_958_MISC_MODE_16BITS;
++ val |= AIU_958_MISC_16BITS_ALIGN(2);
++ break;
++ case 32:
++ case 24:
++ /*
++ * Looks like this should only be set for 32bits mode, but the
++ * vendor kernel sets it like this for 24bits as well, let's
++ * try and see
++ */
++ val |= AIU_958_MISC_MODE_32BITS;
++ break;
++ default:
++ return -EINVAL;
++ }
++
++ /* No idea what this actually does, copying the vendor kernel for now */
++ val |= AIU_958_MISC_FORCE_LR;
++ val |= AIU_958_MISC_U_FROM_STREAM;
++
++ regmap_update_bits(priv->core->aiu, AIU_958_MISC,
++ AIU_958_MISC_NON_PCM |
++ AIU_958_MISC_MODE_16BITS |
++ AIU_958_MISC_16BITS_ALIGN_MASK |
++ AIU_958_MISC_MODE_32BITS |
++ AIU_958_MISC_FORCE_LR,
++ val);
++
++ return 0;
++}
++
++static int meson_spdif_dai_hw_params(struct snd_pcm_substream *substream,
++ struct snd_pcm_hw_params *params,
++ struct snd_soc_dai *dai)
++{
++ struct meson_spdif_dai *priv = snd_soc_dai_get_drvdata(dai);
++ int ret;
++
++ ret = __setup_spdif_clk(priv, params_rate(params));
++ if (ret) {
++ dev_err(dai->dev, "Unable to set the spdif clock\n");
++ return ret;
++ }
++
++ ret = __setup_cs_word(priv, params);
++ if (ret) {
++ dev_err(dai->dev, "Unable to set the channel status word\n");
++ return ret;
++ }
++
++ ret = __setup_pcm_fmt(priv, params_width(params));
++ if (ret) {
++ dev_err(dai->dev, "Unable to set the pcm format\n");
++ return ret;
++ }
++
++ return 0;
++}
++
++static int meson_spdif_dai_startup(struct snd_pcm_substream *substream,
++ struct snd_soc_dai *dai)
++{
++ struct meson_spdif_dai *priv = snd_soc_dai_get_drvdata(dai);
++ int ret;
++
++ /* Power up the spdif fast domain - can't write the registers w/o it */
++ ret = clk_prepare_enable(priv->fast);
++ if (ret)
++ goto out_clk_fast;
++
++ /* Make sure nothing gets out of the DAI yet*/
++ __hold(priv, true);
++
++ ret = clk_set_parent(priv->mclk, priv->mclk_i958);
++ if (ret)
++ return ret;
++
++ /* Enable the clock gate */
++ ret = clk_prepare_enable(priv->iface);
++ if (ret)
++ goto out_clk_iface;
++
++ /* Enable the spdif clock */
++ ret = clk_prepare_enable(priv->mclk);
++ if (ret)
++ goto out_mclk;
++
++ /*
++ * Make sure the interface expect a memory layout we can work with
++ * MEM prefixed register usually belong to the DMA, but when the spdif
++ * DAI takes data from the i2s buffer, we need to make sure it works in
++ * split mode and not the "normal mode" (channel samples packed in
++ * 32 bytes groups)
++ */
++ regmap_update_bits(priv->core->aiu, AIU_MEM_IEC958_CONTROL,
++ AIU_MEM_IEC958_CONTROL_MODE_LINEAR,
++ AIU_MEM_IEC958_CONTROL_MODE_LINEAR);
++
++ return 0;
++
++out_mclk:
++ clk_disable_unprepare(priv->iface);
++out_clk_iface:
++ clk_disable_unprepare(priv->fast);
++out_clk_fast:
++ return ret;
++}
++
++static void meson_spdif_dai_shutdown(struct snd_pcm_substream *substream,
++ struct snd_soc_dai *dai)
++{
++ struct meson_spdif_dai *priv = snd_soc_dai_get_drvdata(dai);
++
++ clk_disable_unprepare(priv->iface);
++ clk_disable_unprepare(priv->mclk);
++ clk_disable_unprepare(priv->fast);
++}
++
++static const struct snd_soc_dai_ops meson_spdif_dai_ops = {
++ .startup = meson_spdif_dai_startup,
++ .shutdown = meson_spdif_dai_shutdown,
++ .trigger = meson_spdif_dai_trigger,
++ .hw_params = meson_spdif_dai_hw_params,
++};
++
++static struct snd_soc_dai_driver meson_spdif_dai = {
++ .playback = {
++ .stream_name = "Playback",
++ .channels_min = 2,
++ .channels_max = 2,
++ .rates = (SNDRV_PCM_RATE_32000 |
++ SNDRV_PCM_RATE_44100 |
++ SNDRV_PCM_RATE_48000 |
++ SNDRV_PCM_RATE_96000 |
++ SNDRV_PCM_RATE_192000),
++ .formats = (SNDRV_PCM_FMTBIT_S16_LE |
++ SNDRV_PCM_FMTBIT_S24_LE)
++ },
++ .ops = &meson_spdif_dai_ops,
++};
++
++static const struct snd_soc_component_driver meson_spdif_dai_component = {
++ .name = DRV_NAME,
++};
++
++static int meson_spdif_dai_probe(struct platform_device *pdev)
++{
++ struct device *dev = &pdev->dev;
++ struct meson_spdif_dai *priv;
++
++ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
++ if (!priv)
++ return -ENOMEM;
++
++ platform_set_drvdata(pdev, priv);
++ priv->core = dev_get_drvdata(dev->parent);
++
++ priv->fast = devm_clk_get(dev, "fast");
++ if (IS_ERR(priv->fast)) {
++ if (PTR_ERR(priv->fast) != -EPROBE_DEFER)
++ dev_err(dev, "Can't get spdif fast domain clockt\n");
++ return PTR_ERR(priv->fast);
++ }
++
++ priv->iface = devm_clk_get(dev, "iface");
++ if (IS_ERR(priv->iface)) {
++ if (PTR_ERR(priv->iface) != -EPROBE_DEFER)
++ dev_err(dev,
++ "Can't get the dai clock gate\n");
++ return PTR_ERR(priv->iface);
++ }
++
++ priv->mclk_i958 = devm_clk_get(dev, "mclk_i958");
++ if (IS_ERR(priv->mclk_i958)) {
++ if (PTR_ERR(priv->mclk_i958) != -EPROBE_DEFER)
++ dev_err(dev, "Can't get the spdif master clock\n");
++ return PTR_ERR(priv->mclk_i958);
++ }
++
++ /*
++ * TODO: the spdif dai can also get its data from the i2s fifo.
++ * For this use-case, the DAI driver will need to get the i2s master
++ * clock in order to reparent the spdif clock from cts_mclk_i958 to
++ * cts_amclk
++ */
++
++ priv->mclk = devm_clk_get(dev, "mclk");
++ if (IS_ERR(priv->mclk)) {
++ if (PTR_ERR(priv->mclk) != -EPROBE_DEFER)
++ dev_err(dev, "Can't get the spdif input mux clock\n");
++ return PTR_ERR(priv->mclk);
++ }
++
++ return devm_snd_soc_register_component(dev, &meson_spdif_dai_component,
++ &meson_spdif_dai, 1);
++}
++
++static const struct of_device_id meson_spdif_dai_of_match[] = {
++ { .compatible = "amlogic,meson-spdif-dai", },
++ { .compatible = "amlogic,meson-gxbb-spdif-dai", },
++ { .compatible = "amlogic,meson-gxl-spdif-dai", },
++ {}
++};
++MODULE_DEVICE_TABLE(of, meson_spdif_dai_of_match);
++
++static struct platform_driver meson_spdif_dai_pdrv = {
++ .probe = meson_spdif_dai_probe,
++ .driver = {
++ .name = DRV_NAME,
++ .of_match_table = meson_spdif_dai_of_match,
++ },
++};
++module_platform_driver(meson_spdif_dai_pdrv);
++
++MODULE_DESCRIPTION("Meson spdif DAI ASoC Driver");
++MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");
++MODULE_LICENSE("GPL v2");
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