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Diffstat (limited to 'sound/soc/dwc/designware_i2s.c')
-rw-r--r--sound/soc/dwc/designware_i2s.c636
1 files changed, 636 insertions, 0 deletions
diff --git a/sound/soc/dwc/designware_i2s.c b/sound/soc/dwc/designware_i2s.c
new file mode 100644
index 000000000..a3e97b46b
--- /dev/null
+++ b/sound/soc/dwc/designware_i2s.c
@@ -0,0 +1,636 @@
+/*
+ * ALSA SoC Synopsys I2S Audio Layer
+ *
+ * sound/soc/dwc/designware_i2s.c
+ *
+ * Copyright (C) 2010 ST Microelectronics
+ * 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.
+ */
+
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <sound/designware_i2s.h>
+#include <sound/pcm.h>
+#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;
+ struct device *dev;
+
+ /* 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);
+};
+
+static inline void i2s_write_reg(void __iomem *io_base, int reg, u32 val)
+{
+ writel(val, io_base + reg);
+}
+
+static inline u32 i2s_read_reg(void __iomem *io_base, int reg)
+{
+ return readl(io_base + reg);
+}
+
+static inline void i2s_disable_channels(struct dw_i2s_dev *dev, u32 stream)
+{
+ u32 i = 0;
+
+ if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ for (i = 0; i < 4; i++)
+ i2s_write_reg(dev->i2s_base, TER(i), 0);
+ } else {
+ for (i = 0; i < 4; i++)
+ i2s_write_reg(dev->i2s_base, RER(i), 0);
+ }
+}
+
+static inline void i2s_clear_irqs(struct dw_i2s_dev *dev, u32 stream)
+{
+ u32 i = 0;
+
+ if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ for (i = 0; i < 4; i++)
+ i2s_write_reg(dev->i2s_base, TOR(i), 0);
+ } else {
+ for (i = 0; i < 4; i++)
+ i2s_write_reg(dev->i2s_base, ROR(i), 0);
+ }
+}
+
+static void i2s_start(struct dw_i2s_dev *dev,
+ struct snd_pcm_substream *substream)
+{
+
+ i2s_write_reg(dev->i2s_base, IER, 1);
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ i2s_write_reg(dev->i2s_base, ITER, 1);
+ else
+ i2s_write_reg(dev->i2s_base, IRER, 1);
+
+ i2s_write_reg(dev->i2s_base, CER, 1);
+}
+
+static void i2s_stop(struct dw_i2s_dev *dev,
+ struct snd_pcm_substream *substream)
+{
+ u32 i = 0, irq;
+
+ i2s_clear_irqs(dev, substream->stream);
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ i2s_write_reg(dev->i2s_base, ITER, 0);
+
+ for (i = 0; i < 4; i++) {
+ irq = i2s_read_reg(dev->i2s_base, IMR(i));
+ i2s_write_reg(dev->i2s_base, IMR(i), irq | 0x30);
+ }
+ } else {
+ i2s_write_reg(dev->i2s_base, IRER, 0);
+
+ for (i = 0; i < 4; i++) {
+ irq = i2s_read_reg(dev->i2s_base, IMR(i));
+ i2s_write_reg(dev->i2s_base, IMR(i), irq | 0x03);
+ }
+ }
+
+ if (!dev->active) {
+ i2s_write_reg(dev->i2s_base, CER, 0);
+ i2s_write_reg(dev->i2s_base, IER, 0);
+ }
+}
+
+static int dw_i2s_startup(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *cpu_dai)
+{
+ struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(cpu_dai);
+ union dw_i2s_snd_dma_data *dma_data = NULL;
+
+ if (!(dev->capability & DWC_I2S_RECORD) &&
+ (substream->stream == SNDRV_PCM_STREAM_CAPTURE))
+ return -EINVAL;
+
+ if (!(dev->capability & DWC_I2S_PLAY) &&
+ (substream->stream == SNDRV_PCM_STREAM_PLAYBACK))
+ return -EINVAL;
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ dma_data = &dev->play_dma_data;
+ else if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
+ dma_data = &dev->capture_dma_data;
+
+ snd_soc_dai_set_dma_data(cpu_dai, substream, (void *)dma_data);
+
+ return 0;
+}
+
+static int dw_i2s_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
+{
+ struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
+ struct i2s_clk_config_data *config = &dev->config;
+ u32 ccr, xfer_resolution, ch_reg, irq;
+ int ret;
+
+ switch (params_format(params)) {
+ case SNDRV_PCM_FORMAT_S16_LE:
+ config->data_width = 16;
+ ccr = 0x00;
+ xfer_resolution = 0x02;
+ break;
+
+ case SNDRV_PCM_FORMAT_S24_LE:
+ config->data_width = 24;
+ ccr = 0x08;
+ xfer_resolution = 0x04;
+ break;
+
+ case SNDRV_PCM_FORMAT_S32_LE:
+ config->data_width = 32;
+ ccr = 0x10;
+ xfer_resolution = 0x05;
+ break;
+
+ default:
+ dev_err(dev->dev, "designware-i2s: unsuppted PCM fmt");
+ return -EINVAL;
+ }
+
+ config->chan_nr = params_channels(params);
+
+ switch (config->chan_nr) {
+ case EIGHT_CHANNEL_SUPPORT:
+ case SIX_CHANNEL_SUPPORT:
+ case FOUR_CHANNEL_SUPPORT:
+ case TWO_CHANNEL_SUPPORT:
+ break;
+ default:
+ dev_err(dev->dev, "channel not supported\n");
+ return -EINVAL;
+ }
+
+ i2s_disable_channels(dev, substream->stream);
+
+ for (ch_reg = 0; ch_reg < (config->chan_nr / 2); ch_reg++) {
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ i2s_write_reg(dev->i2s_base, TCR(ch_reg),
+ xfer_resolution);
+ i2s_write_reg(dev->i2s_base, TFCR(ch_reg), 0x02);
+ irq = i2s_read_reg(dev->i2s_base, IMR(ch_reg));
+ i2s_write_reg(dev->i2s_base, IMR(ch_reg), irq & ~0x30);
+ i2s_write_reg(dev->i2s_base, TER(ch_reg), 1);
+ } else {
+ i2s_write_reg(dev->i2s_base, RCR(ch_reg),
+ xfer_resolution);
+ i2s_write_reg(dev->i2s_base, RFCR(ch_reg), 0x07);
+ irq = i2s_read_reg(dev->i2s_base, IMR(ch_reg));
+ i2s_write_reg(dev->i2s_base, IMR(ch_reg), irq & ~0x03);
+ i2s_write_reg(dev->i2s_base, RER(ch_reg), 1);
+ }
+ }
+
+ i2s_write_reg(dev->i2s_base, CCR, ccr);
+
+ config->sample_rate = params_rate(params);
+
+ if (dev->i2s_clk_cfg) {
+ ret = dev->i2s_clk_cfg(config);
+ if (ret < 0) {
+ dev_err(dev->dev, "runtime audio clk config fail\n");
+ return ret;
+ }
+ } else {
+ u32 bitclk = config->sample_rate * config->data_width * 2;
+
+ ret = clk_set_rate(dev->clk, bitclk);
+ if (ret) {
+ dev_err(dev->dev, "Can't set I2S clock rate: %d\n",
+ ret);
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+static void dw_i2s_shutdown(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *dai)
+{
+ snd_soc_dai_set_dma_data(dai, substream, NULL);
+}
+
+static int dw_i2s_prepare(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *dai)
+{
+ struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ i2s_write_reg(dev->i2s_base, TXFFR, 1);
+ else
+ i2s_write_reg(dev->i2s_base, RXFFR, 1);
+
+ return 0;
+}
+
+static int dw_i2s_trigger(struct snd_pcm_substream *substream,
+ int cmd, struct snd_soc_dai *dai)
+{
+ struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
+ int ret = 0;
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ case SNDRV_PCM_TRIGGER_RESUME:
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ dev->active++;
+ i2s_start(dev, substream);
+ break;
+
+ case SNDRV_PCM_TRIGGER_STOP:
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ dev->active--;
+ i2s_stop(dev, substream);
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+ return ret;
+}
+
+static struct snd_soc_dai_ops dw_i2s_dai_ops = {
+ .startup = dw_i2s_startup,
+ .shutdown = dw_i2s_shutdown,
+ .hw_params = dw_i2s_hw_params,
+ .prepare = dw_i2s_prepare,
+ .trigger = dw_i2s_trigger,
+};
+
+static const struct snd_soc_component_driver dw_i2s_component = {
+ .name = "dw-i2s",
+};
+
+#ifdef CONFIG_PM
+
+static int dw_i2s_suspend(struct snd_soc_dai *dai)
+{
+ struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
+
+ clk_disable(dev->clk);
+ return 0;
+}
+
+static int dw_i2s_resume(struct snd_soc_dai *dai)
+{
+ struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
+
+ clk_enable(dev->clk);
+ return 0;
+}
+
+#else
+#define dw_i2s_suspend NULL
+#define dw_i2s_resume NULL
+#endif
+
+/*
+ * The following tables allow a direct lookup of various parameters
+ * defined in the I2S block's configuration in terms of sound system
+ * parameters. Each table is sized to the number of entries possible
+ * according to the number of configuration bits describing an I2S
+ * block parameter.
+ */
+
+/* Maximum bit resolution of a channel - not uniformly spaced */
+static const u32 fifo_width[COMP_MAX_WORDSIZE] = {
+ 12, 16, 20, 24, 32, 0, 0, 0
+};
+
+/* Width of (DMA) bus */
+static const u32 bus_widths[COMP_MAX_DATA_WIDTH] = {
+ DMA_SLAVE_BUSWIDTH_1_BYTE,
+ DMA_SLAVE_BUSWIDTH_2_BYTES,
+ DMA_SLAVE_BUSWIDTH_4_BYTES,
+ DMA_SLAVE_BUSWIDTH_UNDEFINED
+};
+
+/* PCM format to support channel resolution */
+static const u32 formats[COMP_MAX_WORDSIZE] = {
+ SNDRV_PCM_FMTBIT_S16_LE,
+ SNDRV_PCM_FMTBIT_S16_LE,
+ SNDRV_PCM_FMTBIT_S24_LE,
+ SNDRV_PCM_FMTBIT_S24_LE,
+ SNDRV_PCM_FMTBIT_S32_LE,
+ 0,
+ 0,
+ 0
+};
+
+static int dw_configure_dai(struct dw_i2s_dev *dev,
+ struct snd_soc_dai_driver *dw_i2s_dai,
+ unsigned int rates)
+{
+ /*
+ * Read component parameter registers to extract
+ * the I2S block's configuration.
+ */
+ u32 comp1 = i2s_read_reg(dev->i2s_base, I2S_COMP_PARAM_1);
+ u32 comp2 = i2s_read_reg(dev->i2s_base, I2S_COMP_PARAM_2);
+ u32 idx;
+
+ if (COMP1_TX_ENABLED(comp1)) {
+ dev_dbg(dev->dev, " designware: play supported\n");
+ idx = COMP1_TX_WORDSIZE_0(comp1);
+ if (WARN_ON(idx >= ARRAY_SIZE(formats)))
+ return -EINVAL;
+ dw_i2s_dai->playback.channels_min = MIN_CHANNEL_NUM;
+ dw_i2s_dai->playback.channels_max =
+ 1 << (COMP1_TX_CHANNELS(comp1) + 1);
+ dw_i2s_dai->playback.formats = formats[idx];
+ dw_i2s_dai->playback.rates = rates;
+ }
+
+ if (COMP1_RX_ENABLED(comp1)) {
+ dev_dbg(dev->dev, "designware: record supported\n");
+ idx = COMP2_RX_WORDSIZE_0(comp2);
+ if (WARN_ON(idx >= ARRAY_SIZE(formats)))
+ return -EINVAL;
+ dw_i2s_dai->capture.channels_min = MIN_CHANNEL_NUM;
+ dw_i2s_dai->capture.channels_max =
+ 1 << (COMP1_RX_CHANNELS(comp1) + 1);
+ dw_i2s_dai->capture.formats = formats[idx];
+ dw_i2s_dai->capture.rates = rates;
+ }
+
+ return 0;
+}
+
+static int dw_configure_dai_by_pd(struct dw_i2s_dev *dev,
+ struct snd_soc_dai_driver *dw_i2s_dai,
+ struct resource *res,
+ const struct i2s_platform_data *pdata)
+{
+ u32 comp1 = i2s_read_reg(dev->i2s_base, I2S_COMP_PARAM_1);
+ u32 idx = COMP1_APB_DATA_WIDTH(comp1);
+ int ret;
+
+ if (WARN_ON(idx >= ARRAY_SIZE(bus_widths)))
+ return -EINVAL;
+
+ ret = dw_configure_dai(dev, dw_i2s_dai, pdata->snd_rates);
+ if (ret < 0)
+ return ret;
+
+ /* Set DMA slaves info */
+ dev->play_dma_data.pd.data = pdata->play_dma_data;
+ dev->capture_dma_data.pd.data = pdata->capture_dma_data;
+ dev->play_dma_data.pd.addr = res->start + I2S_TXDMA;
+ dev->capture_dma_data.pd.addr = res->start + I2S_RXDMA;
+ dev->play_dma_data.pd.max_burst = 16;
+ dev->capture_dma_data.pd.max_burst = 16;
+ dev->play_dma_data.pd.addr_width = bus_widths[idx];
+ dev->capture_dma_data.pd.addr_width = bus_widths[idx];
+ dev->play_dma_data.pd.filter = pdata->filter;
+ dev->capture_dma_data.pd.filter = pdata->filter;
+
+ return 0;
+}
+
+static int dw_configure_dai_by_dt(struct dw_i2s_dev *dev,
+ struct snd_soc_dai_driver *dw_i2s_dai,
+ struct resource *res)
+{
+ u32 comp1 = i2s_read_reg(dev->i2s_base, I2S_COMP_PARAM_1);
+ u32 comp2 = i2s_read_reg(dev->i2s_base, I2S_COMP_PARAM_2);
+ u32 fifo_depth = 1 << (1 + COMP1_FIFO_DEPTH_GLOBAL(comp1));
+ u32 idx = COMP1_APB_DATA_WIDTH(comp1);
+ u32 idx2;
+ int ret;
+
+ if (WARN_ON(idx >= ARRAY_SIZE(bus_widths)))
+ return -EINVAL;
+
+ ret = dw_configure_dai(dev, dw_i2s_dai, SNDRV_PCM_RATE_8000_192000);
+ if (ret < 0)
+ return ret;
+
+ if (COMP1_TX_ENABLED(comp1)) {
+ idx2 = COMP1_TX_WORDSIZE_0(comp1);
+
+ dev->capability |= DWC_I2S_PLAY;
+ dev->play_dma_data.dt.addr = res->start + I2S_TXDMA;
+ dev->play_dma_data.dt.addr_width = bus_widths[idx];
+ dev->play_dma_data.dt.chan_name = "TX";
+ dev->play_dma_data.dt.fifo_size = fifo_depth *
+ (fifo_width[idx2]) >> 8;
+ dev->play_dma_data.dt.maxburst = 16;
+ }
+ if (COMP1_RX_ENABLED(comp1)) {
+ idx2 = COMP2_RX_WORDSIZE_0(comp2);
+
+ dev->capability |= DWC_I2S_RECORD;
+ dev->capture_dma_data.dt.addr = res->start + I2S_RXDMA;
+ dev->capture_dma_data.dt.addr_width = bus_widths[idx];
+ dev->capture_dma_data.dt.chan_name = "RX";
+ dev->capture_dma_data.dt.fifo_size = fifo_depth *
+ (fifo_width[idx2] >> 8);
+ dev->capture_dma_data.dt.maxburst = 16;
+ }
+
+ return 0;
+
+}
+
+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;
+ struct snd_soc_dai_driver *dw_i2s_dai;
+
+ dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
+ if (!dev) {
+ dev_warn(&pdev->dev, "kzalloc fail\n");
+ return -ENOMEM;
+ }
+
+ dw_i2s_dai = devm_kzalloc(&pdev->dev, sizeof(*dw_i2s_dai), GFP_KERNEL);
+ if (!dw_i2s_dai)
+ return -ENOMEM;
+
+ dw_i2s_dai->ops = &dw_i2s_dai_ops;
+ dw_i2s_dai->suspend = dw_i2s_suspend;
+ dw_i2s_dai->resume = dw_i2s_resume;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ dev->i2s_base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(dev->i2s_base))
+ return PTR_ERR(dev->i2s_base);
+
+ dev->dev = &pdev->dev;
+ if (pdata) {
+ ret = dw_configure_dai_by_pd(dev, dw_i2s_dai, res, pdata);
+ if (ret < 0)
+ return ret;
+
+ dev->capability = pdata->cap;
+ dev->i2s_clk_cfg = pdata->i2s_clk_cfg;
+ if (!dev->i2s_clk_cfg) {
+ dev_err(&pdev->dev, "no clock configure method\n");
+ return -ENODEV;
+ }
+
+ dev->clk = devm_clk_get(&pdev->dev, NULL);
+ } else {
+ ret = dw_configure_dai_by_dt(dev, dw_i2s_dai, res);
+ if (ret < 0)
+ return ret;
+
+ dev->clk = devm_clk_get(&pdev->dev, "i2sclk");
+ }
+ if (IS_ERR(dev->clk))
+ return PTR_ERR(dev->clk);
+
+ ret = clk_prepare_enable(dev->clk);
+ if (ret < 0)
+ return ret;
+
+ dev_set_drvdata(&pdev->dev, dev);
+ ret = devm_snd_soc_register_component(&pdev->dev, &dw_i2s_component,
+ dw_i2s_dai, 1);
+ if (ret != 0) {
+ dev_err(&pdev->dev, "not able to register dai\n");
+ goto err_clk_disable;
+ }
+
+ if (!pdata) {
+ 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;
+ }
+ }
+
+ return 0;
+
+err_clk_disable:
+ clk_disable_unprepare(dev->clk);
+ return ret;
+}
+
+static int dw_i2s_remove(struct platform_device *pdev)
+{
+ struct dw_i2s_dev *dev = dev_get_drvdata(&pdev->dev);
+
+ clk_disable_unprepare(dev->clk);
+
+ return 0;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id dw_i2s_of_match[] = {
+ { .compatible = "snps,designware-i2s", },
+ {},
+};
+
+MODULE_DEVICE_TABLE(of, dw_i2s_of_match);
+#endif
+
+static struct platform_driver dw_i2s_driver = {
+ .probe = dw_i2s_probe,
+ .remove = dw_i2s_remove,
+ .driver = {
+ .name = "designware-i2s",
+ .of_match_table = of_match_ptr(dw_i2s_of_match),
+ },
+};
+
+module_platform_driver(dw_i2s_driver);
+
+MODULE_AUTHOR("Rajeev Kumar <rajeevkumar.linux@gmail.com>");
+MODULE_DESCRIPTION("DESIGNWARE I2S SoC Interface");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:designware_i2s");
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-05 18:27:41 +0000