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Subject[PATCH v5 3/6] ASoC: dwc: Read I2S block configuration from registers
Date
From: Andrew Jackson <Andrew.Jackson@arm.com>

The I2S block provides component parameter registers which
describe how the block is instantiated. Use these registers
to extract the block's configuration rather than relying on
platform data.

Signed-off-by: Andrew Jackson <Andrew.Jackson@arm.com>
---
sound/soc/dwc/designware_i2s.c | 96 +++++++++++++++++++++++++++++++++++----
1 files changed, 86 insertions(+), 10 deletions(-)

diff --git a/sound/soc/dwc/designware_i2s.c b/sound/soc/dwc/designware_i2s.c
index 08608c1..b3e7567 100644
--- a/sound/soc/dwc/designware_i2s.c
+++ b/sound/soc/dwc/designware_i2s.c
@@ -54,6 +54,31 @@
#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

@@ -335,11 +360,50 @@ static int dw_i2s_resume(struct snd_soc_dai *dai)
#define dw_i2s_resume NULL
#endif

-static void dw_configure_dai_by_pd(struct dw_i2s_dev *dev,
+/*
+ * 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.
+ */
+
+/* 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_by_pd(struct dw_i2s_dev *dev,
struct snd_soc_dai_driver *dw_i2s_dai,
struct resource *res,
const struct i2s_platform_data *pdata)
{
+ /*
+ * 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 = 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;
@@ -348,26 +412,36 @@ static void dw_configure_dai_by_pd(struct dw_i2s_dev *dev,
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 = DMA_SLAVE_BUSWIDTH_2_BYTES;
- dev->capture_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
+ 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;

- if (pdata->cap & DWC_I2S_PLAY) {
+ 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 = pdata->channel;
- dw_i2s_dai->playback.formats = pdata->snd_fmts;
+ 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;
}

- if (pdata->cap & DWC_I2S_RECORD) {
+ 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 = pdata->channel;
- dw_i2s_dai->capture.formats = pdata->snd_fmts;
+ 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;
}
+
+ return 0;
}

static int dw_i2s_probe(struct platform_device *pdev)
@@ -403,7 +477,9 @@ static int dw_i2s_probe(struct platform_device *pdev)
return PTR_ERR(dev->i2s_base);

dev->dev = &pdev->dev;
- dw_configure_dai_by_pd(dev, dw_i2s_dai, res, 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;
--
1.7.1


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