Enable I2S TDM audio capture for Intel Keem Bay platform. The I2S TDM will support 4 channel and 8 channel audio capture only. 4 channel and 8 channel audio capture operates only in slave mode.
Signed-off-by: Michael Sit Wei Hong michael.wei.hong.sit@intel.com Reviewed-by: Sia Jee Heng jee.heng.sia@intel.com Reviewed-by: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com --- sound/soc/intel/keembay/kmb_platform.c | 145 ++++++++++++++++++------- 1 file changed, 108 insertions(+), 37 deletions(-)
diff --git a/sound/soc/intel/keembay/kmb_platform.c b/sound/soc/intel/keembay/kmb_platform.c index eaa4fd391171..09f49e1cda59 100644 --- a/sound/soc/intel/keembay/kmb_platform.c +++ b/sound/soc/intel/keembay/kmb_platform.c @@ -8,6 +8,8 @@ #include <linux/clk.h> #include <linux/io.h> #include <linux/module.h> +#include <linux/of.h> +#include <linux/of_device.h> #include <sound/pcm.h> #include <sound/pcm_params.h> #include <sound/soc.h> @@ -17,7 +19,7 @@ #define PERIODS_MAX 48 #define PERIOD_BYTES_MIN 4096 #define BUFFER_BYTES_MAX (PERIODS_MAX * PERIOD_BYTES_MIN) -#define TDM_OPERATION 1 +#define TDM_OPERATION 5 #define I2S_OPERATION 0 #define DATA_WIDTH_CONFIG_BIT 6 #define TDM_CHANNEL_CONFIG_BIT 3 @@ -82,19 +84,25 @@ static unsigned int kmb_pcm_rx_fn(struct kmb_i2s_info *kmb_i2s, { unsigned int period_pos = rx_ptr % runtime->period_size; void __iomem *i2s_base = kmb_i2s->i2s_base; + int chan = kmb_i2s->config.chan_nr; void *buf = runtime->dma_area; - int i; + int i, j;
/* KMB i2s uses two separate L/R FIFO */ for (i = 0; i < kmb_i2s->fifo_th; i++) { - if (kmb_i2s->config.data_width == 16) { - ((u16(*)[2])buf)[rx_ptr][0] = readl(i2s_base + LRBR_LTHR(0)); - ((u16(*)[2])buf)[rx_ptr][1] = readl(i2s_base + RRBR_RTHR(0)); - } else { - ((u32(*)[2])buf)[rx_ptr][0] = readl(i2s_base + LRBR_LTHR(0)); - ((u32(*)[2])buf)[rx_ptr][1] = readl(i2s_base + RRBR_RTHR(0)); + for (j = 0; j < chan / 2; j++) { + if (kmb_i2s->config.data_width == 16) { + ((u16 *)buf)[rx_ptr * chan + (j * 2)] = + readl(i2s_base + LRBR_LTHR(j)); + ((u16 *)buf)[rx_ptr * chan + ((j * 2) + 1)] = + readl(i2s_base + RRBR_RTHR(j)); + } else { + ((u32 *)buf)[rx_ptr * chan + (j * 2)] = + readl(i2s_base + LRBR_LTHR(j)); + ((u32 *)buf)[rx_ptr * chan + ((j * 2) + 1)] = + readl(i2s_base + RRBR_RTHR(j)); + } } - period_pos++;
if (++rx_ptr >= runtime->buffer_size) @@ -238,6 +246,7 @@ static irqreturn_t kmb_i2s_irq_handler(int irq, void *dev_id) struct kmb_i2s_info *kmb_i2s = dev_id; struct i2s_clk_config_data *config = &kmb_i2s->config; irqreturn_t ret = IRQ_NONE; + u32 tx_enabled = 0; u32 isr[4]; int i;
@@ -246,22 +255,45 @@ static irqreturn_t kmb_i2s_irq_handler(int irq, void *dev_id)
kmb_i2s_clear_irqs(kmb_i2s, SNDRV_PCM_STREAM_PLAYBACK); kmb_i2s_clear_irqs(kmb_i2s, SNDRV_PCM_STREAM_CAPTURE); + /* Only check TX interrupt if TX is active */ + tx_enabled = readl(kmb_i2s->i2s_base + ITER); + + /* + * Data available. Retrieve samples from FIFO + */ + + /* + * 8 channel audio will have isr[0..2] triggered, + * reading the specific isr based on the audio configuration, + * to avoid reading the buffers too early. + */ + switch (config->chan_nr) { + case 2: + if (isr[0] & ISR_RXDA) + kmb_pcm_operation(kmb_i2s, false); + ret = IRQ_HANDLED; + break; + case 4: + if (isr[1] & ISR_RXDA) + kmb_pcm_operation(kmb_i2s, false); + ret = IRQ_HANDLED; + break; + case 8: + if (isr[3] & ISR_RXDA) + kmb_pcm_operation(kmb_i2s, false); + ret = IRQ_HANDLED; + break; + }
for (i = 0; i < config->chan_nr / 2; i++) { /* * Check if TX fifo is empty. If empty fill FIFO with samples */ - if ((isr[i] & ISR_TXFE)) { + if ((isr[i] & ISR_TXFE) && tx_enabled) { kmb_pcm_operation(kmb_i2s, true); ret = IRQ_HANDLED; } - /* - * Data available. Retrieve samples from FIFO - */ - if ((isr[i] & ISR_RXDA)) { - kmb_pcm_operation(kmb_i2s, false); - ret = IRQ_HANDLED; - } + /* Error Handling: TX */ if (isr[i] & ISR_TXFO) { dev_dbg(kmb_i2s->dev, "TX overrun (ch_id=%d)\n", i); @@ -445,7 +477,7 @@ static int kmb_dai_hw_params(struct snd_pcm_substream *substream, { struct kmb_i2s_info *kmb_i2s = snd_soc_dai_get_drvdata(cpu_dai); struct i2s_clk_config_data *config = &kmb_i2s->config; - u32 register_val, write_val; + u32 write_val; int ret;
switch (params_format(hw_params)) { @@ -472,16 +504,34 @@ static int kmb_dai_hw_params(struct snd_pcm_substream *substream, config->chan_nr = params_channels(hw_params);
switch (config->chan_nr) { - /* TODO: This switch case will handle up to TDM8 in the near future */ - case TWO_CHANNEL_SUPPORT: + case 8: + case 4: + /* + * Platform is not capable of providing clocks for + * multi channel audio + */ + if (kmb_i2s->master) + return -EINVAL; + write_val = ((config->chan_nr / 2) << TDM_CHANNEL_CONFIG_BIT) | (config->data_width << DATA_WIDTH_CONFIG_BIT) | - MASTER_MODE | I2S_OPERATION; + !MASTER_MODE | TDM_OPERATION;
writel(write_val, kmb_i2s->pss_base + I2S_GEN_CFG_0); + break; + case 2: + /* + * Platform is only capable of providing clocks need for + * 2 channel master mode + */ + if (!(kmb_i2s->master)) + return -EINVAL; + + write_val = ((config->chan_nr / 2) << TDM_CHANNEL_CONFIG_BIT) | + (config->data_width << DATA_WIDTH_CONFIG_BIT) | + MASTER_MODE | I2S_OPERATION;
- register_val = readl(kmb_i2s->pss_base + I2S_GEN_CFG_0); - dev_dbg(kmb_i2s->dev, "pss register = 0x%X", register_val); + writel(write_val, kmb_i2s->pss_base + I2S_GEN_CFG_0); break; default: dev_dbg(kmb_i2s->dev, "channel not supported\n"); @@ -529,9 +579,9 @@ static struct snd_soc_dai_ops kmb_dai_ops = { .set_fmt = kmb_set_dai_fmt, };
-static struct snd_soc_dai_driver intel_kmb_platform_dai[] = { +static struct snd_soc_dai_driver intel_kmb_i2s_dai[] = { { - .name = "kmb-plat-dai", + .name = "intel_kmb_i2s", .playback = { .channels_min = 2, .channels_max = 2, @@ -547,10 +597,6 @@ static struct snd_soc_dai_driver intel_kmb_platform_dai[] = { .capture = { .channels_min = 2, .channels_max = 2, - /* - * .channels_max will be overwritten - * if provided by Device Tree - */ .rates = SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_48000, @@ -564,9 +610,35 @@ static struct snd_soc_dai_driver intel_kmb_platform_dai[] = { }, };
+static struct snd_soc_dai_driver intel_kmb_tdm_dai[] = { + { + .name = "intel_kmb_tdm", + .capture = { + .channels_min = 4, + .channels_max = 8, + .rates = SNDRV_PCM_RATE_8000 | + SNDRV_PCM_RATE_16000 | + SNDRV_PCM_RATE_48000, + .rate_min = 8000, + .rate_max = 48000, + .formats = (SNDRV_PCM_FMTBIT_S32_LE | + SNDRV_PCM_FMTBIT_S24_LE | + SNDRV_PCM_FMTBIT_S16_LE), + }, + .ops = &kmb_dai_ops, + }, +}; + +static const struct of_device_id kmb_plat_of_match[] = { + { .compatible = "intel,keembay-i2s", .data = &intel_kmb_i2s_dai}, + { .compatible = "intel,keembay-tdm", .data = &intel_kmb_tdm_dai}, + {} +}; + static int kmb_plat_dai_probe(struct platform_device *pdev) { struct snd_soc_dai_driver *kmb_i2s_dai; + const struct of_device_id *match; struct device *dev = &pdev->dev; struct kmb_i2s_info *kmb_i2s; int ret, irq; @@ -580,7 +652,12 @@ static int kmb_plat_dai_probe(struct platform_device *pdev) if (!kmb_i2s_dai) return -ENOMEM;
- kmb_i2s_dai->ops = &kmb_dai_ops; + match = of_match_device(kmb_plat_of_match, &pdev->dev); + if (!match) { + dev_err(&pdev->dev, "Error: No device match found\n"); + return -ENODEV; + } + kmb_i2s_dai = (struct snd_soc_dai_driver *) match->data;
/* Prepare the related clocks */ kmb_i2s->clk_apb = devm_clk_get(dev, "apb_clk"); @@ -630,8 +707,7 @@ static int kmb_plat_dai_probe(struct platform_device *pdev) kmb_i2s->fifo_th = (1 << COMP1_FIFO_DEPTH(comp1_reg)) / 2;
ret = devm_snd_soc_register_component(dev, &kmb_component, - intel_kmb_platform_dai, - ARRAY_SIZE(intel_kmb_platform_dai)); + kmb_i2s_dai, 1); if (ret) { dev_err(dev, "not able to register dai\n"); return ret; @@ -646,11 +722,6 @@ static int kmb_plat_dai_probe(struct platform_device *pdev) return ret; }
-static const struct of_device_id kmb_plat_of_match[] = { - { .compatible = "intel,keembay-i2s", }, - {} -}; - static struct platform_driver kmb_plat_dai_driver = { .driver = { .name = "kmb-plat-dai",