@@ -7,4 +7,13 @@ config SND_DESIGNWARE_I2S
Synopsys desigwnware I2S device. The device supports upto
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.
@@ -1,3 +1,4 @@
# SYNOPSYS Platform Support
-obj-$(CONFIG_SND_DESIGNWARE_I2S) += designware_i2s.o
-
+obj-$(CONFIG_SND_DESIGNWARE_I2S) += dwc_i2s.o
+dwc_i2s-y := designware_i2s.o
+dwc_i2s-$(CONFIG_SND_DESIGNWARE_PCM) += designware_pcm.o
@@ -24,90 +24,7 @@
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/dmaengine_pcm.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
-
-/* 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)
-
-/* I2SCOMPRegisters */
-#define I2S_COMP_PARAM_2 0x01F0
-#define I2S_COMP_PARAM_1 0x01F4
-#define I2S_COMP_VERSION 0x01F8
-#define I2S_COMP_TYPE 0x01FC
-
-/*
- * 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;
- 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;
-
- /* 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);
-};
+#include "local.h"
static inline void i2s_write_reg(void __iomem *io_base, int reg, u32 val)
{
@@ -181,13 +98,49 @@ static inline void i2s_enable_irqs(struct dw_i2s_dev *dev, u32 stream,
}
}
+static irqreturn_t i2s_irq_handler(int irq, void *dev_id)
+{
+ struct dw_i2s_dev *dev = dev_id;
+ bool irq_valid = false;
+ u32 isr[4];
+ int i;
+
+ for (i = 0; i < 4; i++)
+ isr[i] = i2s_read_reg(dev->i2s_base, ISR(i));
+
+ i2s_clear_irqs(dev, SNDRV_PCM_STREAM_PLAYBACK);
+ i2s_clear_irqs(dev, SNDRV_PCM_STREAM_CAPTURE);
+
+ for (i = 0; i < 4; i++) {
+ if (isr[i] & 0x33)
+ irq_valid = true;
+
+ /*
+ * Check if TX fifo is empty. If empty fill FIFO with samples
+ * NOTE: Only two channels supported
+ */
+ if ((isr[i] & 0x10) && (i == 0))
+ dw_pcm_push_tx(dev);
+
+ /* Error Handling */
+ if (isr[i] & 0x20)
+ dev_err(dev->dev, "TX overrun (ch_id=%d)\n", i);
+ if (isr[i] & 0x02)
+ dev_err(dev->dev, "RX overrun (ch_id=%d)\n", i);
+ }
+
+ return irq_valid ? IRQ_HANDLED : IRQ_NONE;
+}
+
static void i2s_start(struct dw_i2s_dev *dev,
struct snd_pcm_substream *substream)
{
struct i2s_clk_config_data *config = &dev->config;
i2s_write_reg(dev->i2s_base, IER, 1);
- i2s_enable_irqs(dev, substream->stream, config->chan_nr);
+
+ if (dev->use_pio)
+ i2s_enable_irqs(dev, substream->stream, config->chan_nr);
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
i2s_write_reg(dev->i2s_base, ITER, 1);
@@ -640,7 +593,7 @@ static int dw_i2s_probe(struct platform_device *pdev)
const struct i2s_platform_data *pdata = pdev->dev.platform_data;
struct dw_i2s_dev *dev;
struct resource *res;
- int ret;
+ int ret, irq;
struct snd_soc_dai_driver *dw_i2s_dai;
const char *clk_id;
@@ -665,6 +618,19 @@ static int dw_i2s_probe(struct platform_device *pdev)
dev->dev = &pdev->dev;
+ irq = platform_get_irq(pdev, 0);
+ if (irq >= 0) {
+ dev_dbg(&pdev->dev, "using PIO mode\n");
+ dev->use_pio = true;
+
+ ret = devm_request_irq(&pdev->dev, irq, i2s_irq_handler, 0,
+ pdev->name, dev);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "failed to request irq\n");
+ return ret;
+ }
+ }
+
dev->i2s_reg_comp1 = I2S_COMP_PARAM_1;
dev->i2s_reg_comp2 = I2S_COMP_PARAM_2;
if (pdata) {
@@ -710,14 +676,22 @@ static int dw_i2s_probe(struct platform_device *pdev)
goto err_clk_disable;
}
- if (!pdata) {
+ if (!pdata && !dev->use_pio) {
ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
if (ret) {
dev_err(&pdev->dev,
"Could not register PCM: %d\n", ret);
goto err_clk_disable;
}
+ } else if (dev->use_pio) {
+ ret = dw_pcm_register(pdev);
+ if (ret) {
+ dev_err(&pdev->dev,
+ "Could not register PIO PCM: %d\n", ret);
+ goto err_clk_disable;
+ }
}
+
pm_runtime_enable(&pdev->dev);
return 0;
new file mode 100644
@@ -0,0 +1,220 @@
+/*
+ * ALSA SoC Synopsys PIO PCM for I2S driver
+ *
+ * sound/soc/dwc/designware_pcm.c
+ *
+ * Copyright (C) 2016 Synopsys
+ * Jose Abreu <joabreu@synopsys.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#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 + LRBR_LTHR(0)); \
+ iowrite32(p[tx_ptr][1], dev->i2s_base + RRBR_RTHR(0)); \
+ period_pos++; \
+ if (++tx_ptr >= runtime->buffer_size) \
+ tx_ptr = 0; \
+ } \
+ *period_elapsed = period_pos >= runtime->period_size; \
+ return tx_ptr; \
+}
+
+dw_pcm_tx_fn(16);
+dw_pcm_tx_fn(32);
+
+#undef dw_pcm_tx_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_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,
+};
+
+void dw_pcm_push_tx(struct dw_i2s_dev *dev)
+{
+ struct snd_pcm_substream *tx_substream;
+ bool tx_active, period_elapsed;
+
+ rcu_read_lock();
+ tx_substream = rcu_dereference(dev->tx_substream);
+ tx_active = tx_substream && snd_pcm_running(tx_substream);
+ if (tx_active) {
+ unsigned int tx_ptr = ACCESS_ONCE(dev->tx_ptr);
+ unsigned int new_tx_ptr = dev->tx_fn(dev, tx_substream->runtime,
+ tx_ptr, &period_elapsed);
+ cmpxchg(&dev->tx_ptr, tx_ptr, new_tx_ptr);
+
+ if (period_elapsed)
+ snd_pcm_period_elapsed(tx_substream);
+ }
+ rcu_read_unlock();
+}
+
+static int dw_pcm_open(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(rtd->cpu_dai);
+
+ 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_pcm_substream *substream)
+{
+ synchronize_rcu();
+ return 0;
+}
+
+static int dw_pcm_hw_params(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;
+ int ret;
+
+ 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;
+ break;
+ case SNDRV_PCM_FORMAT_S32_LE:
+ dev->tx_fn = dw_pcm_tx_32;
+ break;
+ default:
+ dev_err(dev->dev, "invalid format\n");
+ return -EINVAL;
+ }
+
+ if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK) {
+ dev_err(dev->dev, "only playback is available\n");
+ return -EINVAL;
+ }
+
+ ret = snd_pcm_lib_malloc_pages(substream,
+ params_buffer_bytes(hw_params));
+ return (ret < 0) ? ret : 0;
+}
+
+static int dw_pcm_hw_free(struct snd_pcm_substream *substream)
+{
+ return snd_pcm_lib_free_pages(substream);
+}
+
+static int dw_pcm_trigger(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:
+ ACCESS_ONCE(dev->tx_ptr) = 0;
+ rcu_assign_pointer(dev->tx_substream, substream);
+ break;
+ case SNDRV_PCM_TRIGGER_STOP:
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ rcu_assign_pointer(dev->tx_substream, NULL);
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+ return ret;
+}
+
+static snd_pcm_uframes_t dw_pcm_pointer(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 = ACCESS_ONCE(dev->tx_ptr);
+
+ return pos < runtime->buffer_size ? pos : 0;
+}
+
+static int dw_pcm_new(struct snd_soc_pcm_runtime *rtd)
+{
+ size_t size = dw_pcm_hardware.buffer_bytes_max;
+
+ return snd_pcm_lib_preallocate_pages_for_all(rtd->pcm,
+ SNDRV_DMA_TYPE_CONTINUOUS,
+ snd_dma_continuous_data(GFP_KERNEL), size, size);
+}
+
+static void dw_pcm_free(struct snd_pcm *pcm)
+{
+ snd_pcm_lib_preallocate_free_for_all(pcm);
+}
+
+static const struct snd_pcm_ops dw_pcm_ops = {
+ .open = dw_pcm_open,
+ .close = dw_pcm_close,
+ .ioctl = snd_pcm_lib_ioctl,
+ .hw_params = dw_pcm_hw_params,
+ .hw_free = dw_pcm_hw_free,
+ .trigger = dw_pcm_trigger,
+ .pointer = dw_pcm_pointer,
+};
+
+static const struct snd_soc_platform_driver dw_pcm_platform = {
+ .pcm_new = dw_pcm_new,
+ .pcm_free = dw_pcm_free,
+ .ops = &dw_pcm_ops,
+};
+
+int dw_pcm_register(struct platform_device *pdev)
+{
+ return devm_snd_soc_register_platform(&pdev->dev, &dw_pcm_platform);
+}
new file mode 100644
@@ -0,0 +1,122 @@
+/*
+ * Copyright (ST) 2012 Rajeev Kumar (rajeevkumar.linux@gmail.com)
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#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
+
+/* 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)
+
+/* I2SCOMPRegisters */
+#define I2S_COMP_PARAM_2 0x01F0
+#define I2S_COMP_PARAM_1 0x01F4
+#define I2S_COMP_VERSION 0x01F8
+#define I2S_COMP_TYPE 0x01FC
+
+/*
+ * 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;
+ 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;
+
+ /* 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 (TX) */
+ bool use_pio;
+ struct snd_pcm_substream __rcu *tx_substream;
+ unsigned int (*tx_fn)(struct dw_i2s_dev *dev,
+ struct snd_pcm_runtime *runtime, unsigned int tx_ptr,
+ bool *period_elapsed);
+ unsigned int tx_ptr;
+};
+
+#if IS_ENABLED(CONFIG_SND_DESIGNWARE_PCM)
+void dw_pcm_push_tx(struct dw_i2s_dev *dev);
+int dw_pcm_register(struct platform_device *pdev);
+#else
+void dw_pcm_push_tx(struct dw_i2s_dev *dev) { }
+int dw_pcm_register(struct platform_device *pdev)
+{
+ return -EINVAL;
+}
+#endif
+
+#endif
A PCM extension was added to I2S driver so that audio samples are transferred using PIO mode. The PCM supports two channels @ 16 or 32 bits with rates 32k, 44.1k and 48k. Although the mainline I2S driver uses ALSA DMA engine the I2S controller can be built without DMA support, therefore this is the reason why this extension was added. The selection between the use of DMA engine or PIO mode is detected by declaring or not the interrupt parameters in the DT and using Kconfig. Signed-off-by: Jose Abreu <joabreu@synopsys.com> Cc: Carlos Palminha <palminha@synopsys.com> Cc: Mark Brown <broonie@kernel.org> Cc: Liam Girdwood <lgirdwood@gmail.com> Cc: Jaroslav Kysela <perex@perex.cz> Cc: Takashi Iwai <tiwai@suse.com> Cc: Rob Herring <robh@kernel.org> Cc: Alexey Brodkin <abrodkin@synopsys.com> Cc: linux-snps-arc@lists.infradead.org Cc: alsa-devel@alsa-project.org Cc: devicetree@vger.kernel.org Cc: linux-kernel@vger.kernel.org --- Changes v6 -> v7: * Discard the use of memcpy * Report IRQ_HANDLED only when there is an IRQ * Use interrupts to check if PIO mode is in use * Unmask interrupts only when in PIO mode * Remove empty functions Changes v5 -> v6: * Use SNDRV_DMA_TYPE_CONTINUOUS Changes v4 -> v5: * Resolve undefined references when compiling as module * Use DMA properties in I2S to check which mode to use: PIO or DMA (as suggested by Lars-Peter Clausen) Changes v3 -> v4: * Reintroduced custom PCM driver * Use DT boolean to switch between ALSA DMA engine PCM or custom PCM Changes v2 -> v3: * Removed pll_config functions (as suggested by Alexey Brodkin) * Dropped custom platform driver, using now ALSA DMA engine * Dropped IRQ handler for I2S No changes v1 -> v2. sound/soc/dwc/Kconfig | 9 ++ sound/soc/dwc/Makefile | 5 +- sound/soc/dwc/designware_i2s.c | 148 ++++++++++++--------------- sound/soc/dwc/designware_pcm.c | 220 +++++++++++++++++++++++++++++++++++++++++ sound/soc/dwc/local.h | 122 +++++++++++++++++++++++ 5 files changed, 415 insertions(+), 89 deletions(-) create mode 100644 sound/soc/dwc/designware_pcm.c create mode 100644 sound/soc/dwc/local.h