From: Andrew Jackson Andrew.Jackson@arm.com
Allow the driver to be configured through a device tree rather than platform data.
Signed-off-by: Andrew Jackson Andrew.Jackson@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 }, };