ASoC: tegra: Add Tegra210 based ADX driver

The Audio Demultiplexer (ADX) block takes an input stream with up to
16 channels and demultiplexes it into four output streams of up to 16
channels each. A byte RAM helps to form output frames by any combination
of bytes from the input frame. Its design is identical to that of byte
RAM in the AMX except that the data flow direction is reversed.

This patch registers ADX driver with ASoC framework. The component driver
exposes DAPM widgets, routes and kcontrols for the device. The DAI driver
exposes ADX interfaces, which can be used to connect different components
in the ASoC layer. Makefile and Kconfig support is added to allow build
the driver. It can be enabled in the DT via "nvidia,tegra210-adx"
compatible binding.
Signed-off-by: Sameer Pujar <spujar@nvidia.com>
Link: https://lore.kernel.org/r/1631551342-25469-10-git-send-email-spujar@nvidia.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/tegra/Kconfig

@@ -135,6 +135,17 @@ config SND_SOC_TEGRA210_AMX
 	  output frame by any combination of bytes from the input frames.
 	  Say Y or M if you want to add support for Tegra210 AMX module.
 
+config SND_SOC_TEGRA210_ADX
+	tristate "Tegra210 ADX module"
+	help
+	  Config to enable the Audio Demultiplexer (ADX) which takes an
+	  input stream (up to 16 channels) and demultiplexes it into four
+	  output streams (each of up to 16 channels). A byte RAM helps to
+	  form output frames by any combination of bytes from the input
+	  frame. Its design is identical to that of byte RAM in the AMX
+	  except that the data flow direction is reversed.
+	  Say Y or M if you want to add support for Tegra210 ADX module.
+
 config SND_SOC_TEGRA_AUDIO_GRAPH_CARD
 	tristate "Audio Graph Card based Tegra driver"
 	depends on SND_AUDIO_GRAPH_CARD

sound/soc/tegra/Makefile

@@ -16,6 +16,7 @@ snd-soc-tegra210-admaif-objs := tegra210_admaif.o
 snd-soc-tegra210-mvc-objs := tegra210_mvc.o
 snd-soc-tegra210-sfc-objs := tegra210_sfc.o
 snd-soc-tegra210-amx-objs := tegra210_amx.o
+snd-soc-tegra210-adx-objs := tegra210_adx.o
 
 obj-$(CONFIG_SND_SOC_TEGRA) += snd-soc-tegra-pcm.o
 obj-$(CONFIG_SND_SOC_TEGRA20_AC97) += snd-soc-tegra20-ac97.o
@@ -32,6 +33,7 @@ obj-$(CONFIG_SND_SOC_TEGRA210_ADMAIF) += snd-soc-tegra210-admaif.o
 obj-$(CONFIG_SND_SOC_TEGRA210_MVC) += snd-soc-tegra210-mvc.o
 obj-$(CONFIG_SND_SOC_TEGRA210_SFC) += snd-soc-tegra210-sfc.o
 obj-$(CONFIG_SND_SOC_TEGRA210_AMX) += snd-soc-tegra210-amx.o
+obj-$(CONFIG_SND_SOC_TEGRA210_ADX) += snd-soc-tegra210-adx.o
 
 # Tegra machine Support
 snd-soc-tegra-wm8903-objs := tegra_wm8903.o

sound/soc/tegra/tegra210_adx.h

+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * tegra210_adx.h - Definitions for Tegra210 ADX driver
+ *
+ * Copyright (c) 2021, NVIDIA CORPORATION.  All rights reserved.
+ *
+ */
+
+#ifndef __TEGRA210_ADX_H__
+#define __TEGRA210_ADX_H__
+
+/* Register offsets from TEGRA210_ADX*_BASE */
+#define TEGRA210_ADX_RX_STATUS		0x0c
+#define TEGRA210_ADX_RX_INT_STATUS	0x10
+#define TEGRA210_ADX_RX_INT_MASK	0x14
+#define TEGRA210_ADX_RX_INT_SET		0x18
+#define TEGRA210_ADX_RX_INT_CLEAR	0x1c
+#define TEGRA210_ADX_RX_CIF_CTRL	0x20
+#define TEGRA210_ADX_TX_STATUS		0x4c
+#define TEGRA210_ADX_TX_INT_STATUS	0x50
+#define TEGRA210_ADX_TX_INT_MASK	0x54
+#define TEGRA210_ADX_TX_INT_SET		0x58
+#define TEGRA210_ADX_TX_INT_CLEAR	0x5c
+#define TEGRA210_ADX_TX1_CIF_CTRL	0x60
+#define TEGRA210_ADX_TX2_CIF_CTRL	0x64
+#define TEGRA210_ADX_TX3_CIF_CTRL	0x68
+#define TEGRA210_ADX_TX4_CIF_CTRL	0x6c
+#define TEGRA210_ADX_ENABLE		0x80
+#define TEGRA210_ADX_SOFT_RESET		0x84
+#define TEGRA210_ADX_CG			0x88
+#define TEGRA210_ADX_STATUS		0x8c
+#define TEGRA210_ADX_INT_STATUS		0x90
+#define TEGRA210_ADX_CTRL		0xa4
+#define TEGRA210_ADX_IN_BYTE_EN0	0xa8
+#define TEGRA210_ADX_IN_BYTE_EN1	0xac
+#define TEGRA210_ADX_CFG_RAM_CTRL	0xb8
+#define TEGRA210_ADX_CFG_RAM_DATA	0xbc
+
+/* Fields in TEGRA210_ADX_ENABLE */
+#define TEGRA210_ADX_ENABLE_SHIFT			0
+
+/* Fields in TEGRA210_ADX_CFG_RAM_CTRL */
+#define TEGRA210_ADX_CFG_RAM_CTRL_RAM_ADDR_SHIFT	0
+
+#define TEGRA210_ADX_CFG_RAM_CTRL_RW_SHIFT		14
+#define TEGRA210_ADX_CFG_RAM_CTRL_RW_WRITE		(1 << TEGRA210_ADX_CFG_RAM_CTRL_RW_SHIFT)
+
+#define TEGRA210_ADX_CFG_RAM_CTRL_ADDR_INIT_EN_SHIFT	13
+#define TEGRA210_ADX_CFG_RAM_CTRL_ADDR_INIT_EN		(1 << TEGRA210_ADX_CFG_RAM_CTRL_ADDR_INIT_EN_SHIFT)
+
+#define TEGRA210_ADX_CFG_RAM_CTRL_SEQ_ACCESS_EN_SHIFT	12
+#define TEGRA210_ADX_CFG_RAM_CTRL_SEQ_ACCESS_EN		(1 << TEGRA210_ADX_CFG_RAM_CTRL_SEQ_ACCESS_EN_SHIFT)
+
+/* Fields in TEGRA210_ADX_SOFT_RESET */
+#define TEGRA210_ADX_SOFT_RESET_SOFT_RESET_SHIFT	0
+#define TEGRA210_ADX_SOFT_RESET_SOFT_RESET_MASK		(1 << TEGRA210_ADX_SOFT_RESET_SOFT_RESET_SHIFT)
+#define TEGRA210_ADX_SOFT_RESET_SOFT_EN			(1 << TEGRA210_ADX_SOFT_RESET_SOFT_RESET_SHIFT)
+#define TEGRA210_ADX_SOFT_RESET_SOFT_DEFAULT		(0 << TEGRA210_ADX_SOFT_RESET_SOFT_RESET_SHIFT)
+
+#define TEGRA210_ADX_AUDIOCIF_CH_STRIDE		4
+#define TEGRA210_ADX_RAM_DEPTH			16
+#define TEGRA210_ADX_MAP_STREAM_NUMBER_SHIFT	6
+#define TEGRA210_ADX_MAP_WORD_NUMBER_SHIFT	2
+#define TEGRA210_ADX_MAP_BYTE_NUMBER_SHIFT	0
+
+struct tegra210_adx {
+	struct regmap *regmap;
+	unsigned int map[TEGRA210_ADX_RAM_DEPTH];
+	unsigned int byte_mask[2];
+};
+
+#endif