ASoC: tegra: Add Tegra210 based MVC driver

The Master Volume Control (MVC) provides gain or attenuation to a digital
signal path. It can be used in input or output signal path for per-stream
volume control or it can be used as master volume control. The MVC block
has one input and one output. The input digital stream can be mono or
multi-channel (up to 7.1 channels) stream. An independent mute control is
also included in the MVC block.

This patch registers MVC driver with ASoC framework. The component driver
exposes DAPM widgets, routes and kcontrols for the device. The DAI driver
exposes MVC 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-mvc"
compatible binding.
Signed-off-by: Sameer Pujar <spujar@nvidia.com>
Link: https://lore.kernel.org/r/1631551342-25469-7-git-send-email-spujar@nvidia.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/tegra/Kconfig

@@ -108,6 +108,15 @@ config SND_SOC_TEGRA210_ADMAIF
 	  channel. Buffer size is configurable for each ADMAIIF channel.
 	  Say Y or M if you want to add support for Tegra210 ADMAIF module.
 
+config SND_SOC_TEGRA210_MVC
+	tristate "Tegra210 MVC module"
+	help
+	  Config to enable the digital Master Volume Controller (MVC) which
+	  provides gain or attenuation to a digital signal path. It can be
+	  used in input or output signal path. It can be used either for
+	  per-stream volume control or for master volume control.
+	  Say Y or M if you want to add support for Tegra210 MVC 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

@@ -13,6 +13,7 @@ snd-soc-tegra210-dmic-objs := tegra210_dmic.o
 snd-soc-tegra210-i2s-objs := tegra210_i2s.o
 snd-soc-tegra186-dspk-objs := tegra186_dspk.o
 snd-soc-tegra210-admaif-objs := tegra210_admaif.o
+snd-soc-tegra210-mvc-objs := tegra210_mvc.o
 
 obj-$(CONFIG_SND_SOC_TEGRA) += snd-soc-tegra-pcm.o
 obj-$(CONFIG_SND_SOC_TEGRA20_AC97) += snd-soc-tegra20-ac97.o
@@ -26,6 +27,7 @@ obj-$(CONFIG_SND_SOC_TEGRA210_AHUB) += snd-soc-tegra210-ahub.o
 obj-$(CONFIG_SND_SOC_TEGRA210_I2S) += snd-soc-tegra210-i2s.o
 obj-$(CONFIG_SND_SOC_TEGRA186_DSPK) += snd-soc-tegra186-dspk.o
 obj-$(CONFIG_SND_SOC_TEGRA210_ADMAIF) += snd-soc-tegra210-admaif.o
+obj-$(CONFIG_SND_SOC_TEGRA210_MVC) += snd-soc-tegra210-mvc.o
 
 # Tegra machine Support
 snd-soc-tegra-wm8903-objs := tegra_wm8903.o

sound/soc/tegra/tegra210_mvc.h

+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * tegra210_mvc.h - Definitions for Tegra210 MVC driver
+ *
+ * Copyright (c) 2021 NVIDIA CORPORATION.  All rights reserved.
+ *
+ */
+
+#ifndef __TEGRA210_MVC_H__
+#define __TEGRA210_MVC_H__
+
+/*
+ * MVC_RX registers are with respect to XBAR.
+ * The data comes from XBAR to MVC.
+ */
+#define TEGRA210_MVC_RX_STATUS			0x0c
+#define TEGRA210_MVC_RX_INT_STATUS		0x10
+#define TEGRA210_MVC_RX_INT_MASK		0x14
+#define TEGRA210_MVC_RX_INT_SET			0x18
+#define TEGRA210_MVC_RX_INT_CLEAR		0x1c
+#define TEGRA210_MVC_RX_CIF_CTRL		0x20
+
+/*
+ * MVC_TX registers are with respect to XBAR.
+ * The data goes out of MVC.
+ */
+#define TEGRA210_MVC_TX_STATUS			0x4c
+#define TEGRA210_MVC_TX_INT_STATUS		0x50
+#define TEGRA210_MVC_TX_INT_MASK		0x54
+#define TEGRA210_MVC_TX_INT_SET			0x58
+#define TEGRA210_MVC_TX_INT_CLEAR		0x5c
+#define TEGRA210_MVC_TX_CIF_CTRL		0x60
+
+/* Register offsets from TEGRA210_MVC*_BASE */
+#define TEGRA210_MVC_ENABLE			0x80
+#define TEGRA210_MVC_SOFT_RESET			0x84
+#define TEGRA210_MVC_CG				0x88
+#define TEGRA210_MVC_STATUS			0x90
+#define TEGRA210_MVC_INT_STATUS			0x94
+#define TEGRA210_MVC_CTRL			0xa8
+#define TEGRA210_MVC_SWITCH			0xac
+#define TEGRA210_MVC_INIT_VOL			0xb0
+#define TEGRA210_MVC_TARGET_VOL			0xd0
+#define TEGRA210_MVC_DURATION			0xf0
+#define TEGRA210_MVC_DURATION_INV		0xf4
+#define TEGRA210_MVC_POLY_N1			0xf8
+#define TEGRA210_MVC_POLY_N2			0xfc
+#define TEGRA210_MVC_PEAK_CTRL			0x100
+#define TEGRA210_MVC_CFG_RAM_CTRL		0x104
+#define TEGRA210_MVC_CFG_RAM_DATA		0x108
+#define TEGRA210_MVC_PEAK_VALUE			0x10c
+#define TEGRA210_MVC_CONFIG_ERR_TYPE		0x12c
+
+/* Fields in TEGRA210_MVC_ENABLE */
+#define TEGRA210_MVC_EN_SHIFT			0
+#define TEGRA210_MVC_EN				(1 << TEGRA210_MVC_EN_SHIFT)
+
+#define TEGRA210_MVC_MUTE_SHIFT			8
+#define TEGRA210_MUTE_MASK_EN			0xff
+#define TEGRA210_MVC_MUTE_MASK			(TEGRA210_MUTE_MASK_EN << TEGRA210_MVC_MUTE_SHIFT)
+#define TEGRA210_MVC_MUTE_EN			(TEGRA210_MUTE_MASK_EN << TEGRA210_MVC_MUTE_SHIFT)
+
+#define TEGRA210_MVC_PER_CHAN_CTRL_EN_SHIFT	30
+#define TEGRA210_MVC_PER_CHAN_CTRL_EN_MASK	(1 << TEGRA210_MVC_PER_CHAN_CTRL_EN_SHIFT)
+#define TEGRA210_MVC_PER_CHAN_CTRL_EN		(1 << TEGRA210_MVC_PER_CHAN_CTRL_EN_SHIFT)
+
+#define TEGRA210_MVC_CURVE_TYPE_SHIFT		1
+#define TEGRA210_MVC_CURVE_TYPE_MASK		(1 << TEGRA210_MVC_CURVE_TYPE_SHIFT)
+
+#define TEGRA210_MVC_VOLUME_SWITCH_SHIFT	2
+#define TEGRA210_MVC_VOLUME_SWITCH_MASK		(1 << TEGRA210_MVC_VOLUME_SWITCH_SHIFT)
+#define TEGRA210_MVC_VOLUME_SWITCH_TRIGGER	(1 << TEGRA210_MVC_VOLUME_SWITCH_SHIFT)
+#define TEGRA210_MVC_CTRL_DEFAULT	0x40000003
+
+#define TEGRA210_MVC_INIT_VOL_DEFAULT_POLY	0x01000000
+#define TEGRA210_MVC_INIT_VOL_DEFAULT_LINEAR	0x00000000
+
+/* Fields in TEGRA210_MVC ram ctrl */
+#define TEGRA210_MVC_CFG_RAM_CTRL_RW_SHIFT		14
+#define TEGRA210_MVC_CFG_RAM_CTRL_RW_WRITE		(1 << TEGRA210_MVC_CFG_RAM_CTRL_RW_SHIFT)
+
+#define TEGRA210_MVC_CFG_RAM_CTRL_ADDR_INIT_EN_SHIFT	13
+#define TEGRA210_MVC_CFG_RAM_CTRL_ADDR_INIT_EN		(1 << TEGRA210_MVC_CFG_RAM_CTRL_ADDR_INIT_EN_SHIFT)
+
+#define TEGRA210_MVC_CFG_RAM_CTRL_SEQ_ACCESS_EN_SHIFT	12
+#define TEGRA210_MVC_CFG_RAM_CTRL_SEQ_ACCESS_EN		(1 << TEGRA210_MVC_CFG_RAM_CTRL_SEQ_ACCESS_EN_SHIFT)
+
+#define TEGRA210_MVC_CFG_RAM_CTRL_ADDR_SHIFT		0
+#define TEGRA210_MVC_CFG_RAM_CTRL_ADDR_MASK		(0x1ff << TEGRA210_MVC_CFG_RAM_CTRL_ADDR_SHIFT)
+
+#define REG_SIZE 4
+#define TEGRA210_MVC_MAX_CHAN_COUNT 8
+#define TEGRA210_MVC_REG_OFFSET(reg, i) (reg + (REG_SIZE * i))
+
+#define NUM_GAIN_POLY_COEFFS 9
+
+enum {
+	CURVE_POLY,
+	CURVE_LINEAR,
+};
+
+struct tegra210_mvc_gain_params {
+	int poly_coeff[NUM_GAIN_POLY_COEFFS];
+	int poly_n1;
+	int poly_n2;
+	int duration;
+	int duration_inv;
+};
+
+struct tegra210_mvc {
+	int volume[TEGRA210_MVC_MAX_CHAN_COUNT];
+	unsigned int curve_type;
+	unsigned int ctrl_value;
+	struct regmap *regmap;
+};
+
+#endif