@@ -200,6 +200,8 @@ config SND_SOC_INTEL_KEEMBAY
tristate "Keembay Platforms"
depends on ARM64 || COMPILE_TEST
depends on COMMON_CLK
+ select SND_DMAENGINE_PCM
+ select SND_SOC_GENERIC_DMAENGINE_PCM
help
If you have a Intel Keembay platform then enable this option
by saying Y or m.
@@ -6,10 +6,12 @@
//
#include <linux/clk.h>
+#include <linux/dma-mapping.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
+#include <sound/dmaengine_pcm.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
@@ -343,6 +345,53 @@ static const struct snd_soc_component_driver kmb_component = {
.pointer = kmb_pcm_pointer,
};
+static const struct snd_soc_component_driver kmb_component_dma = {
+ .name = "kmb",
+};
+
+static int kmb_probe(struct snd_soc_dai *cpu_dai)
+{
+ struct kmb_i2s_info *kmb_i2s = snd_soc_dai_get_drvdata(cpu_dai);
+
+ if (kmb_i2s->use_pio)
+ return 0;
+
+ snd_soc_dai_init_dma_data(cpu_dai, &kmb_i2s->play_dma_data,
+ &kmb_i2s->capture_dma_data);
+
+ return 0;
+}
+
+static inline void kmb_i2s_enable_dma(struct kmb_i2s_info *kmb_i2s, u32 stream)
+{
+ u32 dma_reg;
+
+ dma_reg = readl(kmb_i2s->i2s_base + I2S_DMACR);
+ /* Enable DMA handshake for stream */
+ if (stream == SNDRV_PCM_STREAM_PLAYBACK)
+ dma_reg |= I2S_DMAEN_TXBLOCK;
+ else
+ dma_reg |= I2S_DMAEN_RXBLOCK;
+
+ writel(dma_reg, kmb_i2s->i2s_base + I2S_DMACR);
+}
+
+static inline void kmb_i2s_disable_dma(struct kmb_i2s_info *kmb_i2s, u32 stream)
+{
+ u32 dma_reg;
+
+ dma_reg = readl(kmb_i2s->i2s_base + I2S_DMACR);
+ /* Disable DMA handshake for stream */
+ if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ dma_reg &= ~I2S_DMAEN_TXBLOCK;
+ writel(1, kmb_i2s->i2s_base + I2S_RTXDMA);
+ } else {
+ dma_reg &= ~I2S_DMAEN_RXBLOCK;
+ writel(1, kmb_i2s->i2s_base + I2S_RRXDMA);
+ }
+ writel(dma_reg, kmb_i2s->i2s_base + I2S_DMACR);
+}
+
static void kmb_i2s_start(struct kmb_i2s_info *kmb_i2s,
struct snd_pcm_substream *substream)
{
@@ -356,7 +405,11 @@ static void kmb_i2s_start(struct kmb_i2s_info *kmb_i2s,
else
writel(1, kmb_i2s->i2s_base + IRER);
- kmb_i2s_irq_trigger(kmb_i2s, substream->stream, config->chan_nr, true);
+ if (kmb_i2s->use_pio)
+ kmb_i2s_irq_trigger(kmb_i2s, substream->stream,
+ config->chan_nr, true);
+ else
+ kmb_i2s_enable_dma(kmb_i2s, substream->stream);
if (kmb_i2s->master)
writel(1, kmb_i2s->i2s_base + CER);
@@ -434,7 +487,8 @@ static int kmb_dai_trigger(struct snd_pcm_substream *substream,
break;
case SNDRV_PCM_TRIGGER_STOP:
kmb_i2s->active--;
- kmb_i2s_stop(kmb_i2s, substream);
+ if (kmb_i2s->use_pio)
+ kmb_i2s_stop(kmb_i2s, substream);
break;
default:
return -EINVAL;
@@ -485,16 +539,22 @@ static int kmb_dai_hw_params(struct snd_pcm_substream *substream,
config->data_width = 16;
kmb_i2s->ccr = 0x00;
kmb_i2s->xfer_resolution = 0x02;
+ kmb_i2s->play_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
+ kmb_i2s->capture_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
break;
case SNDRV_PCM_FORMAT_S24_LE:
config->data_width = 32;
kmb_i2s->ccr = 0x14;
kmb_i2s->xfer_resolution = 0x05;
+ kmb_i2s->play_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+ kmb_i2s->capture_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
break;
case SNDRV_PCM_FORMAT_S32_LE:
config->data_width = 32;
kmb_i2s->ccr = 0x10;
kmb_i2s->xfer_resolution = 0x05;
+ kmb_i2s->play_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+ kmb_i2s->capture_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
break;
default:
dev_err(kmb_i2s->dev, "kmb: unsupported PCM fmt");
@@ -572,9 +632,56 @@ static int kmb_dai_prepare(struct snd_pcm_substream *substream,
return 0;
}
+static int kmb_dai_startup(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *cpu_dai)
+{
+ struct kmb_i2s_info *kmb_i2s = snd_soc_dai_get_drvdata(cpu_dai);
+ struct snd_dmaengine_dai_dma_data *dma_data;
+
+ if (kmb_i2s->use_pio)
+ return 0;
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ dma_data = &kmb_i2s->play_dma_data;
+ else
+ dma_data = &kmb_i2s->capture_dma_data;
+
+ snd_soc_dai_set_dma_data(cpu_dai, substream, dma_data);
+
+ return 0;
+}
+
+static int kmb_dai_hw_free(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *cpu_dai)
+{
+ struct kmb_i2s_info *kmb_i2s = snd_soc_dai_get_drvdata(cpu_dai);
+ /* I2S Programming sequence in Keem_Bay_VPU_DB_v1.1 */
+ if (kmb_i2s->use_pio)
+ kmb_i2s_clear_irqs(kmb_i2s, substream->stream);
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ writel(0, kmb_i2s->i2s_base + ITER);
+ else
+ writel(0, kmb_i2s->i2s_base + IRER);
+
+ if (kmb_i2s->use_pio)
+ kmb_i2s_irq_trigger(kmb_i2s, substream->stream, 8, false);
+ else
+ kmb_i2s_disable_dma(kmb_i2s, substream->stream);
+
+ if (!kmb_i2s->active) {
+ writel(0, kmb_i2s->i2s_base + CER);
+ writel(0, kmb_i2s->i2s_base + IER);
+ }
+
+ return 0;
+}
+
static struct snd_soc_dai_ops kmb_dai_ops = {
+ .startup = kmb_dai_startup,
.trigger = kmb_dai_trigger,
.hw_params = kmb_dai_hw_params,
+ .hw_free = kmb_dai_hw_free,
.prepare = kmb_dai_prepare,
.set_fmt = kmb_set_dai_fmt,
};
@@ -607,6 +714,7 @@ static struct snd_soc_dai_driver intel_kmb_i2s_dai[] = {
SNDRV_PCM_FMTBIT_S16_LE),
},
.ops = &kmb_dai_ops,
+ .probe = kmb_probe,
},
};
@@ -626,6 +734,7 @@ static struct snd_soc_dai_driver intel_kmb_tdm_dai[] = {
SNDRV_PCM_FMTBIT_S16_LE),
},
.ops = &kmb_dai_ops,
+ .probe = kmb_probe,
},
};
@@ -637,10 +746,12 @@ static const struct of_device_id kmb_plat_of_match[] = {
static int kmb_plat_dai_probe(struct platform_device *pdev)
{
+ struct device_node *np = pdev->dev.of_node;
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;
+ struct resource *res;
int ret, irq;
u32 comp1_reg;
@@ -682,7 +793,7 @@ static int kmb_plat_dai_probe(struct platform_device *pdev)
return PTR_ERR(kmb_i2s->clk_i2s);
}
- kmb_i2s->i2s_base = devm_platform_ioremap_resource(pdev, 0);
+ kmb_i2s->i2s_base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
if (IS_ERR(kmb_i2s->i2s_base))
return PTR_ERR(kmb_i2s->i2s_base);
@@ -692,22 +803,38 @@ static int kmb_plat_dai_probe(struct platform_device *pdev)
kmb_i2s->dev = &pdev->dev;
- irq = platform_get_irq_optional(pdev, 0);
- if (irq > 0) {
- ret = devm_request_irq(dev, irq, kmb_i2s_irq_handler, 0,
- pdev->name, kmb_i2s);
- if (ret < 0) {
- dev_err(dev, "failed to request irq\n");
- return ret;
- }
- }
-
comp1_reg = readl(kmb_i2s->i2s_base + I2S_COMP_PARAM_1);
kmb_i2s->fifo_th = (1 << COMP1_FIFO_DEPTH(comp1_reg)) / 2;
- ret = devm_snd_soc_register_component(dev, &kmb_component,
- kmb_i2s_dai, 1);
+ kmb_i2s->use_pio = !(of_property_read_bool(np, "dmas"));
+
+ if (kmb_i2s->use_pio) {
+ irq = platform_get_irq_optional(pdev, 0);
+ if (irq > 0) {
+ ret = devm_request_irq(dev, irq, kmb_i2s_irq_handler, 0,
+ pdev->name, kmb_i2s);
+ if (ret < 0) {
+ dev_err(dev, "failed to request irq\n");
+ return ret;
+ }
+ }
+ ret = devm_snd_soc_register_component(dev, &kmb_component,
+ kmb_i2s_dai, 1);
+ } else {
+ kmb_i2s->play_dma_data.addr = res->start + I2S_TXDMA;
+ kmb_i2s->capture_dma_data.addr = res->start + I2S_RXDMA;
+ ret = snd_dmaengine_pcm_register(&pdev->dev,
+ NULL, 0);
+ if (ret) {
+ dev_err(&pdev->dev, "could not register dmaengine: %d\n",
+ ret);
+ return ret;
+ }
+ ret = devm_snd_soc_register_component(dev, &kmb_component_dma,
+ kmb_i2s_dai, 1);
+ }
+
if (ret) {
dev_err(dev, "not able to register dai\n");
return ret;
@@ -12,6 +12,7 @@
#include <linux/bits.h>
#include <linux/bitfield.h>
#include <linux/types.h>
+#include <sound/dmaengine_pcm.h>
/* Register values with reference to KMB databook v1.1 */
/* common register for all channel */
@@ -103,7 +104,12 @@
#define DW_I2S_MASTER BIT(3)
#define I2S_RXDMA 0x01C0
+#define I2S_RRXDMA 0x01C4
#define I2S_TXDMA 0x01C8
+#define I2S_RTXDMA 0x01CC
+#define I2S_DMACR 0x0200
+#define I2S_DMAEN_RXBLOCK (1 << 16)
+#define I2S_DMAEN_TXBLOCK (1 << 17)
/*
* struct i2s_clk_config_data - represent i2s clk configuration data
@@ -131,6 +137,9 @@ struct kmb_i2s_info {
u32 xfer_resolution;
u32 fifo_th;
bool master;
+ /* data related to DMA transfers b/w i2s and DMAC */
+ struct snd_dmaengine_dai_dma_data play_dma_data;
+ struct snd_dmaengine_dai_dma_data capture_dma_data;
struct i2s_clk_config_data config;
int (*i2s_clk_cfg)(struct i2s_clk_config_data *config);