ASoC: tegra: Add Tegra186 based ASRC driver

Asynchronous Sample Rate Converter (ASRC) converts the sampling frequency
of the input signal from one frequency to another. It can handle over a
wide range of sample rate ratios (freq_in/freq_out) from 1:24 to 24:1.

ASRC has two modes of operation. One where ratio can be programmed in SW
and the other where it gets the information from ratio estimator module.
The latter mode above can help address the cases where the sample rate is
not known at the stream set up time or is potentially time varying.
In addition, the ratio between input and output sample rate can be any
arbitrary number and the input and output clocks could be derived from
asynchronous clocks.

This patch registers ASRC driver with ASoC framework. The component driver
exposes DAPM widgets, routes and kcontrols for the device. The DAI driver
exposes ASRC interfaces, which can be used to connect different components
in the ASoC layer. Makefile and Kconfig support is added to allow build
the driver.

Signed-off-by: Sameer Pujar <spujar@nvidia.com>
Link: https://lore.kernel.org/r/1648735412-32220-3-git-send-email-spujar@nvidia.com
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/tegra/Kconfig

@@ -85,6 +85,18 @@ config SND_SOC_TEGRA210_I2S
 	  compatible devices.
 	  Say Y or M if you want to add support for Tegra210 I2S module.
 
+config SND_SOC_TEGRA186_ASRC
+	tristate "Tegra186 ASRC module"
+	help
+	  Config to enable the Asynchronous Sample Rate Converter (ASRC),
+	  which converts the sampling frequency of the input signal from
+	  one frequency to another. It can handle over a wide range of
+	  sample rate ratios (freq_in/freq_out) from 1:24 to 24:1.
+	  ASRC has two modes of operation. One where ratio can be programmed
+	  in SW and the other where it gets information from ratio estimator
+	  module.
+	  Say Y or M if you want to add support for Tegra186 ASRC module.
+
 config SND_SOC_TEGRA186_DSPK
 	tristate "Tegra186 DSPK module"
 	help

sound/soc/tegra/Makefile

@@ -11,6 +11,7 @@ snd-soc-tegra30-i2s-objs := tegra30_i2s.o
 snd-soc-tegra210-ahub-objs := tegra210_ahub.o
 snd-soc-tegra210-dmic-objs := tegra210_dmic.o
 snd-soc-tegra210-i2s-objs := tegra210_i2s.o
+snd-soc-tegra186-asrc-objs := tegra186_asrc.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
@@ -29,6 +30,7 @@ obj-$(CONFIG_SND_SOC_TEGRA30_I2S) += snd-soc-tegra30-i2s.o
 obj-$(CONFIG_SND_SOC_TEGRA210_DMIC) += snd-soc-tegra210-dmic.o
 obj-$(CONFIG_SND_SOC_TEGRA210_AHUB) += snd-soc-tegra210-ahub.o
 obj-$(CONFIG_SND_SOC_TEGRA210_I2S) += snd-soc-tegra210-i2s.o
+obj-$(CONFIG_SND_SOC_TEGRA186_ASRC) += snd-soc-tegra186-asrc.o
 obj-$(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

sound/soc/tegra/tegra186_asrc.h

@@ -0,0 +1,112 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * tegra186_asrc.h - Definitions for Tegra186 ASRC driver
+ *
+ * Copyright (c) 2022, NVIDIA CORPORATION. All rights reserved.
+ *
+ */
+
+#ifndef __TEGRA186_ASRC_H__
+#define __TEGRA186_ASRC_H__
+
+/* ASRC stream related offset */
+#define TEGRA186_ASRC_CFG				0x0
+#define TEGRA186_ASRC_RATIO_INT_PART			0x4
+#define TEGRA186_ASRC_RATIO_FRAC_PART			0x8
+#define TEGRA186_ASRC_RATIO_LOCK_STATUS			0xc
+#define TEGRA186_ASRC_MUTE_UNMUTE_DURATION		0x10
+#define TEGRA186_ASRC_TX_THRESHOLD			0x14
+#define TEGRA186_ASRC_RX_THRESHOLD			0x18
+#define TEGRA186_ASRC_RATIO_COMP			0x1c
+#define TEGRA186_ASRC_RX_STATUS				0x20
+#define TEGRA186_ASRC_RX_CIF_CTRL			0x24
+#define TEGRA186_ASRC_TX_STATUS				0x2c
+#define TEGRA186_ASRC_TX_CIF_CTRL			0x30
+#define TEGRA186_ASRC_ENABLE				0x38
+#define TEGRA186_ASRC_SOFT_RESET			0x3c
+#define TEGRA186_ASRC_STATUS				0x4c
+#define TEGRA186_ASRC_STATEBUF_ADDR			0x5c
+#define TEGRA186_ASRC_STATEBUF_CFG			0x60
+#define TEGRA186_ASRC_INSAMPLEBUF_ADDR			0x64
+#define TEGRA186_ASRC_INSAMPLEBUF_CFG			0x68
+#define TEGRA186_ASRC_OUTSAMPLEBUF_ADDR			0x6c
+#define TEGRA186_ASRC_OUTSAMPLEBUF_CFG			0x70
+
+/* ASRC Global registers offset */
+#define TEGRA186_ASRC_GLOBAL_ENB			0x2f4
+#define TEGRA186_ASRC_GLOBAL_SOFT_RESET			0x2f8
+#define TEGRA186_ASRC_GLOBAL_CG				0x2fc
+#define TEGRA186_ASRC_GLOBAL_CFG			0x300
+#define TEGRA186_ASRC_GLOBAL_SCRATCH_ADDR		0x304
+#define TEGRA186_ASRC_GLOBAL_SCRATCH_CFG		0x308
+#define TEGRA186_ASRC_RATIO_UPD_RX_CIF_CTRL		0x30c
+#define TEGRA186_ASRC_RATIO_UPD_RX_STATUS		0x310
+#define TEGRA186_ASRC_GLOBAL_STATUS			0x314
+#define TEGRA186_ASRC_GLOBAL_STREAM_ENABLE_STATUS	0x318
+#define TEGRA186_ASRC_GLOBAL_INT_STATUS			0x324
+#define TEGRA186_ASRC_GLOBAL_INT_MASK			0x328
+#define TEGRA186_ASRC_GLOBAL_INT_SET			0x32c
+#define TEGRA186_ASRC_GLOBAL_INT_CLEAR			0x330
+#define TEGRA186_ASRC_GLOBAL_TRANSFER_ERROR_LOG		0x334
+#define TEGRA186_ASRC_GLOBAL_APR_CTRL			0x1000
+#define TEGRA186_ASRC_GLOBAL_APR_CTRL_ACCESS_CTRL	0x1004
+#define TEGRA186_ASRC_GLOBAL_DISARM_APR			0x1008
+#define TEGRA186_ASRC_GLOBAL_DISARM_APR_ACCESS_CTRL	0x100c
+#define TEGRA186_ASRC_GLOBAL_RATIO_WR_ACCESS		0x1010
+#define TEGRA186_ASRC_GLOBAL_RATIO_WR_ACCESS_CTRL	0x1014
+#define TEGRA186_ASRC_CYA				0x1018
+
+#define TEGRA186_ASRC_STREAM_DEFAULT_HW_COMP_BIAS_VALUE		0xaaaa
+#define TEGRA186_ASRC_STREAM_DEFAULT_INPUT_HW_COMP_THRESH_CFG	0x00201002
+#define TEGRA186_ASRC_STREAM_DEFAULT_OUTPUT_HW_COMP_THRESH_CFG	0x00201002
+
+#define TEGRA186_ASRC_GLOBAL_CFG_FRAC_28BIT_PRECISION		0
+#define TEGRA186_ASRC_GLOBAL_CFG_FRAC_32BIT_PRECISION		1
+
+#define TEGRA186_ASRC_STREAM_ENABLE_HW_RATIO_COMP_SHIFT		31
+#define TEGRA186_ASRC_STREAM_ENABLE_HW_RATIO_COMP_MASK		(1 << TEGRA186_ASRC_STREAM_ENABLE_HW_RATIO_COMP_SHIFT)
+#define TEGRA186_ASRC_STREAM_ENABLE_HW_RATIO_COMP_ENABLE	(1 << TEGRA186_ASRC_STREAM_ENABLE_HW_RATIO_COMP_SHIFT)
+#define TEGRA186_ASRC_STREAM_ENABLE_HW_RATIO_COMP_DISABLE	(0 << TEGRA186_ASRC_STREAM_ENABLE_HW_RATIO_COMP_SHIFT)
+
+#define TEGRA186_ASRC_STREAM_RATIO_TYPE_SHIFT			0
+#define TEGRA186_ASRC_STREAM_RATIO_TYPE_MASK			(1 << TEGRA186_ASRC_STREAM_RATIO_TYPE_SHIFT)
+
+#define TEGRA186_ASRC_STREAM_EN_SHIFT				0
+#define TEGRA186_ASRC_STREAM_EN					(1 << TEGRA186_ASRC_STREAM_EN_SHIFT)
+#define TEGRA186_ASRC_GLOBAL_EN_SHIFT				0
+#define TEGRA186_ASRC_GLOBAL_EN					(1 << TEGRA186_ASRC_GLOBAL_EN_SHIFT)
+
+#define TEGRA186_ASRC_STREAM_STATEBUF_CFG_SIZE_SHIFT		0
+#define TEGRA186_ASRC_STREAM_STATEBUF_CFG_SIZE_MASK		(0xffff << TEGRA186_ASRC_STREAM_STATEBUF_CFG_SIZE_SHIFT)
+#define TEGRA186_ASRC_STREAM_INSAMPLEBUF_CFG_SIZE_SHIFT		0
+#define TEGRA186_ASRC_STREAM_INSAMPLEBUF_CFG_SIZE_MASK		(0xffff << TEGRA186_ASRC_STREAM_INSAMPLEBUF_CFG_SIZE_SHIFT)
+#define TEGRA186_ASRC_STREAM_OUTSAMPLEBUF_CFG_SIZE_SHIFT	0
+#define TEGRA186_ASRC_STREAM_OUTSAMPLEBUF_CFG_SIZE_MASK		(0xffff << TEGRA186_ASRC_STREAM_OUTSAMPLEBUF_CFG_SIZE_SHIFT)
+
+#define TEGRA186_ASRC_STREAM_RATIO_INT_PART_MASK		0x1f
+#define TEGRA186_ASRC_STREAM_RATIO_FRAC_PART_MASK		0xffffffff
+
+#define TEGRA186_ASRC_STREAM_STRIDE				0x80
+#define TEGRA186_ASRC_STREAM_MAX				0x6
+#define TEGRA186_ASRC_STREAM_LIMIT				0x2f0
+
+#define TEGRA186_ASRC_RATIO_SOURCE_ARAD				0x0
+#define TEGRA186_ASRC_RATIO_SOURCE_SW				0x1
+
+#define TEGRA186_ASRC_ARAM_START_ADDR				0x3f800000
+
+struct tegra186_asrc_lane {
+	unsigned int int_part;
+	unsigned int frac_part;
+	unsigned int ratio_source;
+	unsigned int hwcomp_disable;
+	unsigned int input_thresh;
+	unsigned int output_thresh;
+};
+
+struct tegra186_asrc {
+	struct tegra186_asrc_lane lane[TEGRA186_ASRC_STREAM_MAX];
+	struct regmap *regmap;
+};
+
+#endif