Resguardo inicial

linux-7.2.3/sound/soc/dwc/Kconfig

@@ -0,0 +1,23 @@
+# SPDX-License-Identifier: GPL-2.0-only
+menu "DesignWare"
+
+config SND_DESIGNWARE_I2S
+	tristate "Synopsys I2S Device Driver"
+	depends on HAVE_CLK
+	select SND_SOC_GENERIC_DMAENGINE_PCM
+	help
+	 Say Y or M if you want to add support for I2S driver for
+	 Synopsys designware I2S device. The device supports up to
+	 a maximum of 8 channels each for play and record.
+
+config SND_DESIGNWARE_PCM
+	bool "PCM PIO extension for I2S driver"
+	depends on SND_DESIGNWARE_I2S
+	help
+	 Say Y or N if you want to add a custom ALSA extension that registers
+	 a PCM and uses PIO to transfer data.
+
+	 This functionality is specially suited for I2S devices that don't have
+	 DMA support.
+
+endmenu

linux-7.2.3/sound/soc/dwc/Makefile

@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0-only
+# SYNOPSYS Platform Support
+obj-$(CONFIG_SND_DESIGNWARE_I2S) += designware_i2s.o
+
+designware_i2s-y := dwc-i2s.o
+designware_i2s-$(CONFIG_SND_DESIGNWARE_PCM) += dwc-pcm.o

linux-7.2.3/sound/soc/dwc/dwc-pcm.c

@@ -0,0 +1,263 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * ALSA SoC Synopsys PIO PCM for I2S driver
+ *
+ * sound/soc/dwc/designware_pcm.c
+ *
+ * Copyright (C) 2016 Synopsys
+ * Jose Abreu <joabreu@synopsys.com>
+ */
+
+#include <linux/io.h>
+#include <linux/rcupdate.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include "local.h"
+
+#define BUFFER_BYTES_MAX	(3 * 2 * 8 * PERIOD_BYTES_MIN)
+#define PERIOD_BYTES_MIN	4096
+#define PERIODS_MIN		2
+
+#define dw_pcm_tx_fn(sample_bits) \
+static unsigned int dw_pcm_tx_##sample_bits(struct dw_i2s_dev *dev, \
+		struct snd_pcm_runtime *runtime, unsigned int tx_ptr, \
+		bool *period_elapsed) \
+{ \
+	const u##sample_bits (*p)[2] = (void *)runtime->dma_area; \
+	unsigned int period_pos = tx_ptr % runtime->period_size; \
+	int i; \
+\
+	for (i = 0; i < dev->fifo_th; i++) { \
+		iowrite32(p[tx_ptr][0], dev->i2s_base + dev->l_reg); \
+		iowrite32(p[tx_ptr][1], dev->i2s_base + dev->r_reg); \
+		period_pos++; \
+		if (++tx_ptr >= runtime->buffer_size) \
+			tx_ptr = 0; \
+	} \
+	*period_elapsed = period_pos >= runtime->period_size; \
+	return tx_ptr; \
+}
+
+#define dw_pcm_rx_fn(sample_bits) \
+static unsigned int dw_pcm_rx_##sample_bits(struct dw_i2s_dev *dev, \
+		struct snd_pcm_runtime *runtime, unsigned int rx_ptr, \
+		bool *period_elapsed) \
+{ \
+	u##sample_bits (*p)[2] = (void *)runtime->dma_area; \
+	unsigned int period_pos = rx_ptr % runtime->period_size; \
+	int i; \
+\
+	for (i = 0; i < dev->fifo_th; i++) { \
+		p[rx_ptr][0] = ioread32(dev->i2s_base + dev->l_reg); \
+		p[rx_ptr][1] = ioread32(dev->i2s_base + dev->r_reg); \
+		period_pos++; \
+		if (++rx_ptr >= runtime->buffer_size) \
+			rx_ptr = 0; \
+	} \
+	*period_elapsed = period_pos >= runtime->period_size; \
+	return rx_ptr; \
+}
+
+dw_pcm_tx_fn(16);
+dw_pcm_tx_fn(32);
+dw_pcm_rx_fn(16);
+dw_pcm_rx_fn(32);
+
+#undef dw_pcm_tx_fn
+#undef dw_pcm_rx_fn
+
+static const struct snd_pcm_hardware dw_pcm_hardware = {
+	.info = SNDRV_PCM_INFO_INTERLEAVED |
+		SNDRV_PCM_INFO_MMAP |
+		SNDRV_PCM_INFO_MMAP_VALID |
+		SNDRV_PCM_INFO_BLOCK_TRANSFER,
+	.rates = SNDRV_PCM_RATE_32000 |
+		SNDRV_PCM_RATE_44100 |
+		SNDRV_PCM_RATE_48000,
+	.rate_min = 32000,
+	.rate_max = 48000,
+	.formats = SNDRV_PCM_FMTBIT_S16_LE |
+		SNDRV_PCM_FMTBIT_S24_LE |
+		SNDRV_PCM_FMTBIT_S32_LE,
+	.channels_min = 2,
+	.channels_max = 2,
+	.buffer_bytes_max = BUFFER_BYTES_MAX,
+	.period_bytes_min = PERIOD_BYTES_MIN,
+	.period_bytes_max = BUFFER_BYTES_MAX / PERIODS_MIN,
+	.periods_min = PERIODS_MIN,
+	.periods_max = BUFFER_BYTES_MAX / PERIOD_BYTES_MIN,
+	.fifo_size = 16,
+};
+
+static void dw_pcm_transfer(struct dw_i2s_dev *dev, bool push)
+{
+	struct snd_pcm_substream *substream;
+	bool active, period_elapsed;
+
+	rcu_read_lock();
+	if (push)
+		substream = rcu_dereference(dev->tx_substream);
+	else
+		substream = rcu_dereference(dev->rx_substream);
+	active = substream && snd_pcm_running(substream);
+	if (active) {
+		unsigned int ptr;
+		unsigned int new_ptr;
+
+		if (push) {
+			ptr = READ_ONCE(dev->tx_ptr);
+			new_ptr = dev->tx_fn(dev, substream->runtime, ptr,
+					&period_elapsed);
+			cmpxchg(&dev->tx_ptr, ptr, new_ptr);
+		} else {
+			ptr = READ_ONCE(dev->rx_ptr);
+			new_ptr = dev->rx_fn(dev, substream->runtime, ptr,
+					&period_elapsed);
+			cmpxchg(&dev->rx_ptr, ptr, new_ptr);
+		}
+
+		if (period_elapsed)
+			snd_pcm_period_elapsed(substream);
+	}
+	rcu_read_unlock();
+}
+
+void dw_pcm_push_tx(struct dw_i2s_dev *dev)
+{
+	dw_pcm_transfer(dev, true);
+}
+
+void dw_pcm_pop_rx(struct dw_i2s_dev *dev)
+{
+	dw_pcm_transfer(dev, false);
+}
+
+static int dw_pcm_open(struct snd_soc_component *component,
+		       struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
+	struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(snd_soc_rtd_to_cpu(rtd, 0));
+
+	snd_soc_set_runtime_hwparams(substream, &dw_pcm_hardware);
+	snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
+	runtime->private_data = dev;
+
+	return 0;
+}
+
+static int dw_pcm_close(struct snd_soc_component *component,
+			struct snd_pcm_substream *substream)
+{
+	synchronize_rcu();
+	return 0;
+}
+
+static int dw_pcm_hw_params(struct snd_soc_component *component,
+			    struct snd_pcm_substream *substream,
+			    struct snd_pcm_hw_params *hw_params)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct dw_i2s_dev *dev = runtime->private_data;
+
+	switch (params_channels(hw_params)) {
+	case 2:
+		break;
+	default:
+		dev_err(dev->dev, "invalid channels number\n");
+		return -EINVAL;
+	}
+
+	switch (params_format(hw_params)) {
+	case SNDRV_PCM_FORMAT_S16_LE:
+		dev->tx_fn = dw_pcm_tx_16;
+		dev->rx_fn = dw_pcm_rx_16;
+		break;
+	case SNDRV_PCM_FORMAT_S24_LE:
+	case SNDRV_PCM_FORMAT_S32_LE:
+		dev->tx_fn = dw_pcm_tx_32;
+		dev->rx_fn = dw_pcm_rx_32;
+		break;
+	default:
+		dev_err(dev->dev, "invalid format\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int dw_pcm_trigger(struct snd_soc_component *component,
+			  struct snd_pcm_substream *substream, int cmd)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct dw_i2s_dev *dev = runtime->private_data;
+	int ret = 0;
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+	case SNDRV_PCM_TRIGGER_RESUME:
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+			WRITE_ONCE(dev->tx_ptr, 0);
+			rcu_assign_pointer(dev->tx_substream, substream);
+		} else {
+			WRITE_ONCE(dev->rx_ptr, 0);
+			rcu_assign_pointer(dev->rx_substream, substream);
+		}
+		break;
+	case SNDRV_PCM_TRIGGER_STOP:
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+			rcu_assign_pointer(dev->tx_substream, NULL);
+		else
+			rcu_assign_pointer(dev->rx_substream, NULL);
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+
+	return ret;
+}
+
+static snd_pcm_uframes_t dw_pcm_pointer(struct snd_soc_component *component,
+					struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct dw_i2s_dev *dev = runtime->private_data;
+	snd_pcm_uframes_t pos;
+
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+		pos = READ_ONCE(dev->tx_ptr);
+	else
+		pos = READ_ONCE(dev->rx_ptr);
+
+	return pos < runtime->buffer_size ? pos : 0;
+}
+
+static int dw_pcm_new(struct snd_soc_component *component,
+		      struct snd_soc_pcm_runtime *rtd)
+{
+	size_t size = dw_pcm_hardware.buffer_bytes_max;
+
+	snd_pcm_set_managed_buffer_all(rtd->pcm,
+			SNDRV_DMA_TYPE_CONTINUOUS,
+			NULL, size, size);
+	return 0;
+}
+
+static const struct snd_soc_component_driver dw_pcm_component = {
+	.open		= dw_pcm_open,
+	.close		= dw_pcm_close,
+	.hw_params	= dw_pcm_hw_params,
+	.trigger	= dw_pcm_trigger,
+	.pointer	= dw_pcm_pointer,
+	.pcm_new	= dw_pcm_new,
+};
+
+int dw_pcm_register(struct platform_device *pdev)
+{
+	return devm_snd_soc_register_component(&pdev->dev, &dw_pcm_component,
+					       NULL, 0);
+}

linux-7.2.3/sound/soc/dwc/local.h

@@ -0,0 +1,164 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (ST) 2012 Rajeev Kumar (rajeevkumar.linux@gmail.com)
+ */
+
+#ifndef __DESIGNWARE_LOCAL_H
+#define __DESIGNWARE_LOCAL_H
+
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/types.h>
+#include <sound/dmaengine_pcm.h>
+#include <sound/pcm.h>
+#include <sound/designware_i2s.h>
+
+/* common register for all channel */
+#define IER		0x000
+#define IRER		0x004
+#define ITER		0x008
+#define CER		0x00C
+#define CCR		0x010
+#define RXFFR		0x014
+#define TXFFR		0x018
+
+/* Enable register fields */
+#define IER_TDM_SLOTS_SHIFT	8
+#define IER_FRAME_OFF_SHIFT	5
+#define IER_FRAME_OFF	BIT(5)
+#define IER_INTF_TYPE	BIT(1)
+#define IER_IEN		BIT(0)
+
+/* Interrupt status register fields */
+#define ISR_TXFO	BIT(5)
+#define ISR_TXFE	BIT(4)
+#define ISR_RXFO	BIT(1)
+#define ISR_RXDA	BIT(0)
+
+/* I2STxRxRegisters for all channels */
+#define LRBR_LTHR(x)	(0x40 * x + 0x020)
+#define RRBR_RTHR(x)	(0x40 * x + 0x024)
+#define RER(x)		(0x40 * x + 0x028)
+#define TER(x)		(0x40 * x + 0x02C)
+#define RCR(x)		(0x40 * x + 0x030)
+#define TCR(x)		(0x40 * x + 0x034)
+#define ISR(x)		(0x40 * x + 0x038)
+#define IMR(x)		(0x40 * x + 0x03C)
+#define ROR(x)		(0x40 * x + 0x040)
+#define TOR(x)		(0x40 * x + 0x044)
+#define RFCR(x)		(0x40 * x + 0x048)
+#define TFCR(x)		(0x40 * x + 0x04C)
+#define RFF(x)		(0x40 * x + 0x050)
+#define TFF(x)		(0x40 * x + 0x054)
+#define RSLOT_TSLOT(x)	(0x4 * (x) + 0x224)
+
+/* Receive enable register fields */
+#define RER_RXSLOT_SHIFT	8
+#define RER_RXCHEN	BIT(0)
+
+/* Transmit enable register fields */
+#define TER_TXSLOT_SHIFT	8
+#define TER_TXCHEN	BIT(0)
+
+/* I2SCOMPRegisters */
+#define I2S_COMP_PARAM_2	0x01F0
+#define I2S_COMP_PARAM_1	0x01F4
+#define I2S_COMP_VERSION	0x01F8
+#define I2S_COMP_TYPE		0x01FC
+
+#define I2S_RRXDMA		0x01C4
+#define I2S_RTXDMA		0x01CC
+#define I2S_DMACR		0x0200
+#define I2S_DMAEN_RXBLOCK	(1 << 16)
+#define I2S_DMAEN_TXBLOCK	(1 << 17)
+
+/*
+ * Component parameter register fields - define the I2S block's
+ * configuration.
+ */
+#define	COMP1_TX_WORDSIZE_3(r)	(((r) & GENMASK(27, 25)) >> 25)
+#define	COMP1_TX_WORDSIZE_2(r)	(((r) & GENMASK(24, 22)) >> 22)
+#define	COMP1_TX_WORDSIZE_1(r)	(((r) & GENMASK(21, 19)) >> 19)
+#define	COMP1_TX_WORDSIZE_0(r)	(((r) & GENMASK(18, 16)) >> 16)
+#define	COMP1_TX_CHANNELS(r)	(((r) & GENMASK(10, 9)) >> 9)
+#define	COMP1_RX_CHANNELS(r)	(((r) & GENMASK(8, 7)) >> 7)
+#define	COMP1_RX_ENABLED(r)	(((r) & BIT(6)) >> 6)
+#define	COMP1_TX_ENABLED(r)	(((r) & BIT(5)) >> 5)
+#define	COMP1_MODE_EN(r)	(((r) & BIT(4)) >> 4)
+#define	COMP1_FIFO_DEPTH_GLOBAL(r)	(((r) & GENMASK(3, 2)) >> 2)
+#define	COMP1_APB_DATA_WIDTH(r)	(((r) & GENMASK(1, 0)) >> 0)
+
+#define	COMP2_RX_WORDSIZE_3(r)	(((r) & GENMASK(12, 10)) >> 10)
+#define	COMP2_RX_WORDSIZE_2(r)	(((r) & GENMASK(9, 7)) >> 7)
+#define	COMP2_RX_WORDSIZE_1(r)	(((r) & GENMASK(5, 3)) >> 3)
+#define	COMP2_RX_WORDSIZE_0(r)	(((r) & GENMASK(2, 0)) >> 0)
+
+/* Number of entries in WORDSIZE and DATA_WIDTH parameter registers */
+#define	COMP_MAX_WORDSIZE	(1 << 3)
+#define	COMP_MAX_DATA_WIDTH	(1 << 2)
+
+#define MAX_CHANNEL_NUM		8
+#define MIN_CHANNEL_NUM		2
+
+union dw_i2s_snd_dma_data {
+	struct i2s_dma_data pd;
+	struct snd_dmaengine_dai_dma_data dt;
+};
+
+struct dw_i2s_dev {
+	void __iomem *i2s_base;
+	struct clk *clk;
+	struct reset_control *reset;
+	int active;
+	unsigned int capability;
+	unsigned int quirks;
+	unsigned int i2s_reg_comp1;
+	unsigned int i2s_reg_comp2;
+	struct device *dev;
+	u32 ccr;
+	u32 xfer_resolution;
+	u32 fifo_th;
+	u32 l_reg;
+	u32 r_reg;
+	bool is_jh7110; /* Flag for StarFive JH7110 SoC */
+
+	/* data related to DMA transfers b/w i2s and DMAC */
+	union dw_i2s_snd_dma_data play_dma_data;
+	union dw_i2s_snd_dma_data capture_dma_data;
+	struct i2s_clk_config_data config;
+	int (*i2s_clk_cfg)(struct i2s_clk_config_data *config);
+
+	/* data related to PIO transfers */
+	bool use_pio;
+
+	/* data related to TDM mode */
+	u32 tdm_slots;
+	u32 tdm_mask;
+	u32 frame_offset;
+
+	struct snd_pcm_substream __rcu *tx_substream;
+	struct snd_pcm_substream __rcu *rx_substream;
+	unsigned int (*tx_fn)(struct dw_i2s_dev *dev,
+			struct snd_pcm_runtime *runtime, unsigned int tx_ptr,
+			bool *period_elapsed);
+	unsigned int (*rx_fn)(struct dw_i2s_dev *dev,
+			struct snd_pcm_runtime *runtime, unsigned int rx_ptr,
+			bool *period_elapsed);
+	unsigned int tx_ptr;
+	unsigned int rx_ptr;
+};
+
+#if IS_ENABLED(CONFIG_SND_DESIGNWARE_PCM)
+void dw_pcm_push_tx(struct dw_i2s_dev *dev);
+void dw_pcm_pop_rx(struct dw_i2s_dev *dev);
+int dw_pcm_register(struct platform_device *pdev);
+#else
+static inline void dw_pcm_push_tx(struct dw_i2s_dev *dev) { }
+static inline void dw_pcm_pop_rx(struct dw_i2s_dev *dev) { }
+static inline int dw_pcm_register(struct platform_device *pdev)
+{
+	return -EINVAL;
+}
+#endif
+
+#endif