[alsa-devel] [PATCH v4 5/5] ASoC: dwc: Add devicetree support for Designware I2S
Andrew Jackson
andrew.jackson at arm.com
Tue Dec 23 14:56:27 CET 2014
From: Andrew Jackson <Andrew.Jackson at arm.com>
Allow the driver to be configured through a device tree rather than platform
data.
Signed-off-by: Andrew Jackson <Andrew.Jackson at arm.com>
---
sound/soc/dwc/Kconfig | 1 +
sound/soc/dwc/designware_i2s.c | 193 +++++++++++++++++++++++++++++++---------
2 files changed, 151 insertions(+), 43 deletions(-)
diff --git a/sound/soc/dwc/Kconfig b/sound/soc/dwc/Kconfig
index e334900..d50e085 100644
--- a/sound/soc/dwc/Kconfig
+++ b/sound/soc/dwc/Kconfig
@@ -1,6 +1,7 @@
config SND_DESIGNWARE_I2S
tristate "Synopsys I2S Device Driver"
depends on CLKDEV_LOOKUP
+ select SND_SOC_GENERIC_DMAENGINE_PCM
help
Say Y or M if you want to add support for I2S driver for
Synopsys desigwnware I2S device. The device supports upto
diff --git a/sound/soc/dwc/designware_i2s.c b/sound/soc/dwc/designware_i2s.c
index c89b9eb..9e95274 100644
--- a/sound/soc/dwc/designware_i2s.c
+++ b/sound/soc/dwc/designware_i2s.c
@@ -22,6 +22,7 @@
#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
@@ -82,6 +83,11 @@
#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;
@@ -90,8 +96,8 @@ struct dw_i2s_dev {
struct device *dev;
/* data related to DMA transfers b/w i2s and DMAC */
- struct i2s_dma_data play_dma_data;
- struct i2s_dma_data capture_dma_data;
+ 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);
};
@@ -178,7 +184,7 @@ 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);
- struct i2s_dma_data *dma_data = NULL;
+ union dw_i2s_snd_dma_data *dma_data = NULL;
if (!(dev->capability & DWC_I2S_RECORD) &&
(substream->stream == SNDRV_PCM_STREAM_CAPTURE))
@@ -267,13 +273,21 @@ static int dw_i2s_hw_params(struct snd_pcm_substream *substream,
config->sample_rate = params_rate(params);
- if (!dev->i2s_clk_cfg)
- return -EINVAL;
+ 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 = dev->i2s_clk_cfg(config);
- if (ret < 0) {
- dev_err(dev->dev, "runtime audio clk config fail\n");
- return ret;
+ 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;
@@ -368,6 +382,11 @@ static int dw_i2s_resume(struct snd_soc_dai *dai)
* 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,
@@ -388,10 +407,9 @@ static const u32 formats[COMP_MAX_WORDSIZE] = {
0
};
-static int dw_configure_dai_by_pd(struct dw_i2s_dev *dev,
+static int dw_configure_dai(struct dw_i2s_dev *dev,
struct snd_soc_dai_driver *dw_i2s_dai,
- struct resource *res,
- const struct i2s_platform_data *pdata)
+ unsigned int rates)
{
/*
* Read component parameter registers to extract
@@ -399,23 +417,7 @@ static int dw_configure_dai_by_pd(struct dw_i2s_dev *dev,
*/
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 = COMP1_APB_DATA_WIDTH(comp1);
-
- if (WARN_ON(idx >= ARRAY_SIZE(bus_widths)))
- return -EINVAL;
-
- /* Set DMA slaves info */
-
- dev->play_dma_data.data = pdata->play_dma_data;
- dev->capture_dma_data.data = pdata->capture_dma_data;
- dev->play_dma_data.addr = res->start + I2S_TXDMA;
- dev->capture_dma_data.addr = res->start + I2S_RXDMA;
- dev->play_dma_data.max_burst = 16;
- dev->capture_dma_data.max_burst = 16;
- dev->play_dma_data.addr_width = bus_widths[idx];
- dev->capture_dma_data.addr_width = bus_widths[idx];
- dev->play_dma_data.filter = pdata->filter;
- dev->capture_dma_data.filter = pdata->filter;
+ u32 idx;
if (COMP1_TX_ENABLED(comp1)) {
dev_dbg(dev->dev, " designware: play supported\n");
@@ -426,7 +428,7 @@ static int dw_configure_dai_by_pd(struct dw_i2s_dev *dev,
dw_i2s_dai->playback.channels_max =
1 << (COMP1_TX_CHANNELS(comp1) + 1);
dw_i2s_dai->playback.formats = formats[idx];
- dw_i2s_dai->playback.rates = pdata->snd_rates;
+ dw_i2s_dai->playback.rates = rates;
}
if (COMP1_RX_ENABLED(comp1)) {
@@ -438,10 +440,86 @@ static int dw_configure_dai_by_pd(struct dw_i2s_dev *dev,
dw_i2s_dai->capture.channels_max =
1 << (COMP1_RX_CHANNELS(comp1) + 1);
dw_i2s_dai->capture.formats = formats[idx];
- dw_i2s_dai->capture.rates = pdata->snd_rates;
+ 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)
@@ -452,11 +530,6 @@ static int dw_i2s_probe(struct platform_device *pdev)
int ret;
struct snd_soc_dai_driver *dw_i2s_dai;
- if (!pdata) {
- dev_err(&pdev->dev, "Invalid platform data\n");
- return -EINVAL;
- }
-
dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
if (!dev) {
dev_warn(&pdev->dev, "kzalloc fail\n");
@@ -477,15 +550,28 @@ static int dw_i2s_probe(struct platform_device *pdev)
return PTR_ERR(dev->i2s_base);
dev->dev = &pdev->dev;
- ret = dw_configure_dai_by_pd(dev, dw_i2s_dai, res, pdata);
- if (ret < 0)
- return ret;
+ 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->capability = pdata->cap;
- dev->i2s_clk_cfg = pdata->i2s_clk_cfg;
- dev->clk = devm_clk_get(&pdev->dev, NULL);
+ dev->clk = devm_clk_get(&pdev->dev, "i2sclk");
+ }
if (IS_ERR(dev->clk))
- return PTR_ERR(dev->clk);
+ return PTR_ERR(dev->clk);
ret = clk_prepare_enable(dev->clk);
if (ret < 0)
@@ -499,6 +585,15 @@ static int dw_i2s_probe(struct platform_device *pdev)
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);
+ return ret;
+ }
+ }
+
return 0;
err_clk_disable:
@@ -517,11 +612,23 @@ static int dw_i2s_remove(struct platform_device *pdev)
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",
+#ifdef CONFIG_OF
+ .of_match_table = of_match_ptr(dw_i2s_of_match),
+#endif
},
};
--
1.7.1
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