The Pulse Density Modulation Inteface Controller driver
includes two parts.
1) Driver code to implement the PDMIC function.
2) Device tree binding documentation, it describes how to add
the PDMIC in device tree.
Songjun Wu (2):
ASoC: atmel-pdmic: add the Pulse Density Modulation Interface
Controller
ASoC: atmel-pdmic: DT binding for PDMIC driver
.../devicetree/bindings/sound/atmel-pdmic.txt | 55 ++
sound/soc/atmel/Kconfig | 9 +
sound/soc/atmel/Makefile | 2 +
sound/soc/atmel/atmel-pdmic.c | 745 ++++++++++++++++++++
sound/soc/atmel/atmel-pdmic.h | 80 +++
5 files changed, 891 insertions(+)
create mode 100644 Documentation/devicetree/bindings/sound/atmel-pdmic.txt
create mode 100644 sound/soc/atmel/atmel-pdmic.c
create mode 100644 sound/soc/atmel/atmel-pdmic.h
--
1.7.9.5
Add driver for the Pulse Density Modulation Interface
Controller. It comes with digitallly controlled gain,
a High-Pass and a SINCC filter.
Signed-off-by: Songjun Wu <[email protected]>
---
sound/soc/atmel/Kconfig | 9 +
sound/soc/atmel/Makefile | 2 +
sound/soc/atmel/atmel-pdmic.c | 745 +++++++++++++++++++++++++++++++++++++++++
sound/soc/atmel/atmel-pdmic.h | 80 +++++
4 files changed, 836 insertions(+)
create mode 100644 sound/soc/atmel/atmel-pdmic.c
create mode 100644 sound/soc/atmel/atmel-pdmic.h
diff --git a/sound/soc/atmel/Kconfig b/sound/soc/atmel/Kconfig
index 2d30464..06e099e 100644
--- a/sound/soc/atmel/Kconfig
+++ b/sound/soc/atmel/Kconfig
@@ -68,4 +68,13 @@ config SND_ATMEL_SOC_CLASSD
help
Say Y if you want to add support for Atmel ASoC driver for boards using
CLASSD.
+
+config SND_ATMEL_SOC_PDMIC
+ tristate "Atmel ASoC driver for boards using PDMIC"
+ depends on OF && (ARCH_AT91 || COMPILE_TEST)
+ select SND_SOC_GENERIC_DMAENGINE_PCM
+ select REGMAP_MMIO
+ help
+ Say Y if you want to add support for Atmel ASoC driver for boards using
+ PDMIC.
endif
diff --git a/sound/soc/atmel/Makefile b/sound/soc/atmel/Makefile
index f6f7db4..a2b127b 100644
--- a/sound/soc/atmel/Makefile
+++ b/sound/soc/atmel/Makefile
@@ -12,8 +12,10 @@ snd-soc-sam9g20-wm8731-objs := sam9g20_wm8731.o
snd-atmel-soc-wm8904-objs := atmel_wm8904.o
snd-soc-sam9x5-wm8731-objs := sam9x5_wm8731.o
snd-atmel-soc-classd-objs := atmel-classd.o
+snd-atmel-soc-pdmic-objs := atmel-pdmic.o
obj-$(CONFIG_SND_AT91_SOC_SAM9G20_WM8731) += snd-soc-sam9g20-wm8731.o
obj-$(CONFIG_SND_ATMEL_SOC_WM8904) += snd-atmel-soc-wm8904.o
obj-$(CONFIG_SND_AT91_SOC_SAM9X5_WM8731) += snd-soc-sam9x5-wm8731.o
obj-$(CONFIG_SND_ATMEL_SOC_CLASSD) += snd-atmel-soc-classd.o
+obj-$(CONFIG_SND_ATMEL_SOC_PDMIC) += snd-atmel-soc-pdmic.o
diff --git a/sound/soc/atmel/atmel-pdmic.c b/sound/soc/atmel/atmel-pdmic.c
new file mode 100644
index 0000000..357d261
--- /dev/null
+++ b/sound/soc/atmel/atmel-pdmic.c
@@ -0,0 +1,745 @@
+/* Atmel PDMIC driver
+ *
+ * Copyright (C) 2015 Atmel
+ *
+ * Author: Songjun Wu <[email protected]>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 or later
+ * as published by the Free Software Foundation.
+ */
+
+#include <linux/of.h>
+#include <linux/clk.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <sound/core.h>
+#include <sound/dmaengine_pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/tlv.h>
+#include "atmel-pdmic.h"
+
+struct atmel_pdmic_pdata {
+ u32 mic_min_freq;
+ u32 mic_max_freq;
+ s32 mic_offset;
+ const char *card_name;
+};
+
+struct atmel_pdmic {
+ dma_addr_t phy_base;
+ struct regmap *regmap;
+ struct clk *pclk;
+ struct clk *gclk;
+ int irq;
+ struct snd_pcm_substream *substream;
+ const struct atmel_pdmic_pdata *pdata;
+};
+
+static const struct of_device_id atmel_pdmic_of_match[] = {
+ {
+ .compatible = "atmel,sama5d2-pdmic",
+ }, {
+ /* sentinel */
+ }
+};
+MODULE_DEVICE_TABLE(of, atmel_pdmic_of_match);
+
+#define PDMIC_OFFSET_MAX_VAL S16_MAX
+#define PDMIC_OFFSET_MIN_VAL S16_MIN
+
+static struct atmel_pdmic_pdata *atmel_pdmic_dt_init(struct device *dev)
+{
+ struct device_node *np = dev->of_node;
+ struct atmel_pdmic_pdata *pdata;
+
+ if (!np) {
+ dev_err(dev, "device node not found\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return ERR_PTR(-ENOMEM);
+
+ if (of_property_read_string(np, "atmel,model", &pdata->card_name))
+ pdata->card_name = "PDMIC";
+
+ if (of_property_read_u32(np, "atmel,mic-min-freq",
+ &pdata->mic_min_freq)) {
+ dev_err(dev, "failed to get mic-min-freq\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ if (of_property_read_u32(np, "atmel,mic-max-freq",
+ &pdata->mic_max_freq)) {
+ dev_err(dev, "failed to get mic-max-freq\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ if (pdata->mic_max_freq < pdata->mic_min_freq) {
+ dev_err(dev,
+ "mic-max-freq should not less than mic-min-freq\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ if (of_property_read_s32(np, "atmel,mic-offset",
+ &pdata->mic_offset)) {
+ pdata->mic_offset = 0;
+ }
+
+ if (pdata->mic_offset > PDMIC_OFFSET_MAX_VAL) {
+ dev_warn(dev,
+ "mic-offset value %d is larger than the max value %d, the max value is specified\n",
+ pdata->mic_offset, PDMIC_OFFSET_MAX_VAL);
+ pdata->mic_offset = PDMIC_OFFSET_MAX_VAL;
+ } else if (pdata->mic_offset < PDMIC_OFFSET_MIN_VAL) {
+ dev_warn(dev,
+ "mic-offset value %d is less than the min value %d, the min value is specified\n",
+ pdata->mic_offset, PDMIC_OFFSET_MIN_VAL);
+ pdata->mic_offset = PDMIC_OFFSET_MIN_VAL;
+ }
+
+ return pdata;
+}
+
+/* cpu dai component */
+static int atmel_pdmic_cpu_dai_startup(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *cpu_dai)
+{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct atmel_pdmic *dd = snd_soc_card_get_drvdata(rtd->card);
+ int ret;
+
+ ret = clk_prepare_enable(dd->gclk);
+ if (ret)
+ return ret;
+
+ ret = clk_prepare_enable(dd->pclk);
+ if (ret)
+ return ret;
+
+ /* Clear all bits in the Control Register(PDMIC_CR) */
+ regmap_write(dd->regmap, PDMIC_CR, 0);
+
+ dd->substream = substream;
+
+ /* Enable the overrun error interrupt */
+ regmap_write(dd->regmap, PDMIC_IER, PDMIC_IER_OVRE);
+
+ return 0;
+}
+
+static void atmel_pdmic_cpu_dai_shutdown(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *cpu_dai)
+{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct atmel_pdmic *dd = snd_soc_card_get_drvdata(rtd->card);
+
+ /* Disable the overrun error interrupt */
+ regmap_write(dd->regmap, PDMIC_IDR, PDMIC_IDR_OVRE);
+
+ clk_disable_unprepare(dd->gclk);
+ clk_disable_unprepare(dd->pclk);
+}
+
+static int atmel_pdmic_cpu_dai_prepare(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *cpu_dai)
+{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct atmel_pdmic *dd = snd_soc_card_get_drvdata(rtd->card);
+ u32 val;
+
+ /* Clean the PDMIC Converted Data Register */
+ return regmap_read(dd->regmap, PDMIC_CDR, &val);
+}
+
+static const struct snd_soc_dai_ops atmel_pdmic_cpu_dai_ops = {
+ .startup = atmel_pdmic_cpu_dai_startup,
+ .shutdown = atmel_pdmic_cpu_dai_shutdown,
+ .prepare = atmel_pdmic_cpu_dai_prepare,
+};
+
+#define ATMEL_PDMIC_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S32_LE)
+
+static struct snd_soc_dai_driver atmel_pdmic_cpu_dai = {
+ .capture = {
+ .channels_min = 1,
+ .channels_max = 1,
+ .rates = SNDRV_PCM_RATE_KNOT,
+ .formats = ATMEL_PDMIC_FORMATS,},
+ .ops = &atmel_pdmic_cpu_dai_ops,
+};
+
+static const struct snd_soc_component_driver atmel_pdmic_cpu_dai_component = {
+ .name = "atmel-pdmic",
+};
+
+/* platform */
+#define ATMEL_PDMIC_MAX_BUF_SIZE (64 * 1024)
+#define ATMEL_PDMIC_PREALLOC_BUF_SIZE ATMEL_PDMIC_MAX_BUF_SIZE
+
+static const struct snd_pcm_hardware atmel_pdmic_hw = {
+ .info = SNDRV_PCM_INFO_MMAP
+ | SNDRV_PCM_INFO_MMAP_VALID
+ | SNDRV_PCM_INFO_INTERLEAVED
+ | SNDRV_PCM_INFO_RESUME
+ | SNDRV_PCM_INFO_PAUSE,
+ .formats = ATMEL_PDMIC_FORMATS,
+ .buffer_bytes_max = ATMEL_PDMIC_MAX_BUF_SIZE,
+ .period_bytes_min = 256,
+ .period_bytes_max = 32 * 1024,
+ .periods_min = 2,
+ .periods_max = 256,
+};
+
+static int
+atmel_pdmic_platform_configure_dma(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params,
+ struct dma_slave_config *slave_config)
+{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct atmel_pdmic *dd = snd_soc_card_get_drvdata(rtd->card);
+ int ret;
+
+ ret = snd_hwparams_to_dma_slave_config(substream,
+ params, slave_config);
+ if (ret) {
+ dev_err(rtd->platform->dev,
+ "hw params to dma slave configure failed\n");
+ return ret;
+ }
+
+ slave_config->src_addr = dd->phy_base + PDMIC_CDR;
+ slave_config->src_maxburst = 1;
+ slave_config->dst_maxburst = 1;
+
+ return 0;
+}
+
+static const struct snd_dmaengine_pcm_config
+atmel_pdmic_dmaengine_pcm_config = {
+ .prepare_slave_config = atmel_pdmic_platform_configure_dma,
+ .pcm_hardware = &atmel_pdmic_hw,
+ .prealloc_buffer_size = ATMEL_PDMIC_PREALLOC_BUF_SIZE,
+};
+
+/* codec */
+/* Mic Gain = dgain * 2^(-scale) */
+struct mic_gain {
+ unsigned int dgain;
+ unsigned int scale;
+};
+
+/* range from -90 dB to 90 dB */
+static const struct mic_gain mic_gain_table[] = {
+{ 1, 15}, { 1, 14}, /* -90, -84 dB */
+{ 3, 15}, { 1, 13}, { 3, 14}, { 1, 12}, /* -81, -78, -75, -72 dB */
+{ 5, 14}, { 13, 15}, /* -70, -68 dB */
+{ 9, 14}, { 21, 15}, { 23, 15}, { 13, 14}, /* -65 ~ -62 dB */
+{ 29, 15}, { 33, 15}, { 37, 15}, { 41, 15}, /* -61 ~ -58 dB */
+{ 23, 14}, { 13, 13}, { 58, 15}, { 65, 15}, /* -57 ~ -54 dB */
+{ 73, 15}, { 41, 14}, { 23, 13}, { 13, 12}, /* -53 ~ -50 dB */
+{ 29, 13}, { 65, 14}, { 73, 14}, { 41, 13}, /* -49 ~ -46 dB */
+{ 23, 12}, { 207, 15}, { 29, 12}, { 65, 13}, /* -45 ~ -42 dB */
+{ 73, 13}, { 41, 12}, { 23, 11}, { 413, 15}, /* -41 ~ -38 dB */
+{ 463, 15}, { 519, 15}, { 583, 15}, { 327, 14}, /* -37 ~ -34 dB */
+{ 367, 14}, { 823, 15}, { 231, 13}, { 1036, 15}, /* -33 ~ -30 dB */
+{ 1163, 15}, { 1305, 15}, { 183, 12}, { 1642, 15}, /* -29 ~ -26 dB */
+{ 1843, 15}, { 2068, 15}, { 145, 11}, { 2603, 15}, /* -25 ~ -22 dB */
+{ 365, 12}, { 3277, 15}, { 3677, 15}, { 4125, 15}, /* -21 ~ -18 dB */
+{ 4629, 15}, { 5193, 15}, { 5827, 15}, { 3269, 14}, /* -17 ~ -14 dB */
+{ 917, 12}, { 8231, 15}, { 9235, 15}, { 5181, 14}, /* -13 ~ -10 dB */
+{11627, 15}, {13045, 15}, {14637, 15}, {16423, 15}, /* -9 ~ -6 dB */
+{18427, 15}, {20675, 15}, { 5799, 13}, {26029, 15}, /* -5 ~ -2 dB */
+{ 7301, 13}, { 1, 0}, {18383, 14}, {10313, 13}, /* -1 ~ 2 dB */
+{23143, 14}, {25967, 14}, {29135, 14}, {16345, 13}, /* 3 ~ 6 dB */
+{ 4585, 11}, {20577, 13}, { 1443, 9}, {25905, 13}, /* 7 ~ 10 dB */
+{14533, 12}, { 8153, 11}, { 2287, 9}, {20529, 12}, /* 11 ~ 14 dB */
+{11517, 11}, { 6461, 10}, {28997, 12}, { 4067, 9}, /* 15 ~ 18 dB */
+{18253, 11}, { 10, 0}, {22979, 11}, {25783, 11}, /* 19 ~ 22 dB */
+{28929, 11}, {32459, 11}, { 9105, 9}, {20431, 10}, /* 23 ~ 26 dB */
+{22925, 10}, {12861, 9}, { 7215, 8}, {16191, 9}, /* 27 ~ 30 dB */
+{ 9083, 8}, {20383, 9}, {11435, 8}, { 6145, 7}, /* 31 ~ 34 dB */
+{ 3599, 6}, {32305, 9}, {18123, 8}, {20335, 8}, /* 35 ~ 38 dB */
+{ 713, 3}, { 100, 0}, { 7181, 6}, { 8057, 6}, /* 39 ~ 42 dB */
+{ 565, 2}, {20287, 7}, {11381, 6}, {25539, 7}, /* 43 ~ 46 dB */
+{ 1791, 3}, { 4019, 4}, { 9019, 5}, {20239, 6}, /* 47 ~ 50 dB */
+{ 5677, 4}, {25479, 6}, { 7147, 4}, { 8019, 4}, /* 51 ~ 54 dB */
+{17995, 5}, {20191, 5}, {11327, 4}, {12709, 4}, /* 55 ~ 58 dB */
+{ 3565, 2}, { 1000, 0}, { 1122, 0}, { 1259, 0}, /* 59 ~ 62 dB */
+{ 2825, 1}, {12679, 3}, { 7113, 2}, { 7981, 2}, /* 63 ~ 66 dB */
+{ 8955, 2}, {20095, 3}, {22547, 3}, {12649, 2}, /* 67 ~ 70 dB */
+{28385, 3}, { 3981, 0}, {17867, 2}, {20047, 2}, /* 71 ~ 74 dB */
+{11247, 1}, {12619, 1}, {14159, 1}, {31773, 2}, /* 75 ~ 78 dB */
+{17825, 1}, {10000, 0}, {11220, 0}, {12589, 0}, /* 79 ~ 82 dB */
+{28251, 1}, {15849, 0}, {17783, 0}, {19953, 0}, /* 83 ~ 86 dB */
+{22387, 0}, {25119, 0}, {28184, 0}, {31623, 0}, /* 87 ~ 90 dB */
+};
+
+static const DECLARE_TLV_DB_RANGE(mic_gain_tlv,
+ 0, 1, TLV_DB_SCALE_ITEM(-9000, 600, 0),
+ 2, 5, TLV_DB_SCALE_ITEM(-8100, 300, 0),
+ 6, 7, TLV_DB_SCALE_ITEM(-7000, 200, 0),
+ 8, ARRAY_SIZE(mic_gain_table)-1, TLV_DB_SCALE_ITEM(-6500, 100, 0),
+);
+
+int pdmic_get_mic_volsw(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol)
+{
+ struct snd_soc_codec *codec = snd_soc_kcontrol_codec(kcontrol);
+ unsigned int dgain_val, scale_val;
+ int i;
+
+ dgain_val = (snd_soc_read(codec, PDMIC_DSPR1) & PDMIC_DSPR1_DGAIN_MASK)
+ >> PDMIC_DSPR1_DGAIN_SHIFT;
+
+ scale_val = (snd_soc_read(codec, PDMIC_DSPR0) & PDMIC_DSPR0_SCALE_MASK)
+ >> PDMIC_DSPR0_SCALE_SHIFT;
+
+ for (i = 0; i < ARRAY_SIZE(mic_gain_table); i++) {
+ if ((mic_gain_table[i].dgain == dgain_val)
+ && (mic_gain_table[i].scale == scale_val))
+ ucontrol->value.integer.value[0] = i;
+ }
+
+ return 0;
+}
+
+static int pdmic_put_mic_volsw(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol)
+{
+ struct soc_mixer_control *mc =
+ (struct soc_mixer_control *)kcontrol->private_value;
+ struct snd_soc_codec *codec = snd_soc_kcontrol_codec(kcontrol);
+ int max = mc->max;
+ unsigned int val;
+ int ret;
+
+ val = ucontrol->value.integer.value[0];
+
+ if (val > max)
+ return -EINVAL;
+
+ ret = snd_soc_update_bits(codec, PDMIC_DSPR1,
+ PDMIC_DSPR1_DGAIN_MASK,
+ mic_gain_table[val].dgain << PDMIC_DSPR1_DGAIN_SHIFT);
+ if (ret < 0)
+ return ret;
+
+ ret = snd_soc_update_bits(codec, PDMIC_DSPR0,
+ PDMIC_DSPR0_SCALE_MASK,
+ mic_gain_table[val].scale << PDMIC_DSPR0_SCALE_SHIFT);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+static const struct snd_kcontrol_new atmel_pdmic_snd_controls[] = {
+SOC_SINGLE_EXT_TLV("Mic Capture Volume", PDMIC_DSPR1, PDMIC_DSPR1_DGAIN_SHIFT,
+ ARRAY_SIZE(mic_gain_table)-1, 0,
+ pdmic_get_mic_volsw, pdmic_put_mic_volsw, mic_gain_tlv),
+
+SOC_SINGLE("High Pass Filter Switch", PDMIC_DSPR0,
+ PDMIC_DSPR0_HPFBYP_SHIFT, 1, 1),
+
+SOC_SINGLE("SINCC Filter Switch", PDMIC_DSPR0, PDMIC_DSPR0_SINBYP_SHIFT, 1, 1),
+};
+
+static int atmel_pdmic_codec_probe(struct snd_soc_codec *codec)
+{
+ struct snd_soc_card *card = snd_soc_codec_get_drvdata(codec);
+ struct atmel_pdmic *dd = snd_soc_card_get_drvdata(card);
+
+ snd_soc_update_bits(codec, PDMIC_DSPR1,
+ PDMIC_DSPR1_OFFSET_MASK,
+ (u32)(dd->pdata->mic_offset << PDMIC_DSPR1_OFFSET_SHIFT));
+
+ return 0;
+}
+
+static struct regmap *atmel_pdmic_codec_get_remap(struct device *dev)
+{
+ return dev_get_regmap(dev, NULL);
+}
+
+static struct snd_soc_codec_driver soc_codec_dev_pdmic = {
+ .probe = atmel_pdmic_codec_probe,
+ .controls = atmel_pdmic_snd_controls,
+ .num_controls = ARRAY_SIZE(atmel_pdmic_snd_controls),
+ .get_regmap = atmel_pdmic_codec_get_remap,
+};
+
+/* codec dai component */
+#define PDMIC_MR_PRESCAL_MAX_VAL 127
+
+static int
+atmel_pdmic_codec_dai_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params,
+ struct snd_soc_dai *codec_dai)
+{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct atmel_pdmic *dd = snd_soc_card_get_drvdata(rtd->card);
+ struct snd_soc_codec *codec = codec_dai->codec;
+ unsigned int rate_min = substream->runtime->hw.rate_min;
+ unsigned int rate_max = substream->runtime->hw.rate_max;
+ int fs = params_rate(params);
+ int bits = params_width(params);
+ unsigned long pclk_rate, gclk_rate;
+ unsigned int f_pdmic;
+ u32 mr_val, dspr0_val, pclk_prescal, gclk_prescal;
+
+ if (params_channels(params) != 1) {
+ dev_err(codec->dev,
+ "only supports one channel\n");
+ return -EINVAL;
+ }
+
+ if ((fs < rate_min) || (fs > rate_max)) {
+ dev_err(codec->dev,
+ "sample rate is %dHz, min rate is %dHz, max rate is %dHz\n",
+ fs, rate_min, rate_max);
+
+ return -EINVAL;
+ }
+
+ if (bits == 16)
+ dspr0_val = (PDMIC_DSPR0_SIZE_16_BITS
+ << PDMIC_DSPR0_SIZE_SHIFT);
+ else if (bits == 32)
+ dspr0_val = (PDMIC_DSPR0_SIZE_32_BITS
+ << PDMIC_DSPR0_SIZE_SHIFT);
+ else
+ return -EINVAL;
+
+ if ((fs << 7) > (rate_max << 6)) {
+ f_pdmic = fs << 6;
+ dspr0_val |= PDMIC_DSPR0_OSR_64 << PDMIC_DSPR0_OSR_SHIFT;
+ } else {
+ f_pdmic = fs << 7;
+ dspr0_val |= PDMIC_DSPR0_OSR_128 << PDMIC_DSPR0_OSR_SHIFT;
+ }
+
+ pclk_rate = clk_get_rate(dd->pclk);
+ gclk_rate = clk_get_rate(dd->gclk);
+
+ /* PRESCAL = SELCK/(2*f_pdmic) - 1*/
+ pclk_prescal = (u32)(pclk_rate/(f_pdmic << 1)) - 1;
+ gclk_prescal = (u32)(gclk_rate/(f_pdmic << 1)) - 1;
+
+ if ((pclk_prescal > PDMIC_MR_PRESCAL_MAX_VAL)
+ || (gclk_rate/((gclk_prescal + 1) << 1)
+ < pclk_rate/((pclk_prescal + 1) << 1))) {
+ mr_val = gclk_prescal << PDMIC_MR_PRESCAL_SHIFT;
+ mr_val |= PDMIC_MR_CLKS_GCK << PDMIC_MR_CLKS_SHIFT;
+ } else {
+ mr_val = pclk_prescal << PDMIC_MR_PRESCAL_SHIFT;
+ mr_val |= PDMIC_MR_CLKS_PCK << PDMIC_MR_CLKS_SHIFT;
+ }
+
+ snd_soc_update_bits(codec, PDMIC_MR,
+ PDMIC_MR_PRESCAL_MASK | PDMIC_MR_CLKS_MASK, mr_val);
+
+ snd_soc_update_bits(codec, PDMIC_DSPR0,
+ PDMIC_DSPR0_OSR_MASK | PDMIC_DSPR0_SIZE_MASK, dspr0_val);
+
+ return 0;
+}
+
+static int atmel_pdmic_codec_dai_prepare(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *codec_dai)
+{
+ struct snd_soc_codec *codec = codec_dai->codec;
+
+ snd_soc_update_bits(codec, PDMIC_CR, PDMIC_CR_ENPDM_MASK,
+ PDMIC_CR_ENPDM_DIS << PDMIC_CR_ENPDM_SHIFT);
+
+ return 0;
+}
+
+static int atmel_pdmic_codec_dai_trigger(struct snd_pcm_substream *substream,
+ int cmd, struct snd_soc_dai *codec_dai)
+{
+ struct snd_soc_codec *codec = codec_dai->codec;
+ u32 val;
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ case SNDRV_PCM_TRIGGER_RESUME:
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ val = PDMIC_CR_ENPDM_EN << PDMIC_CR_ENPDM_SHIFT;
+ break;
+ case SNDRV_PCM_TRIGGER_STOP:
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ val = PDMIC_CR_ENPDM_DIS << PDMIC_CR_ENPDM_SHIFT;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ snd_soc_update_bits(codec, PDMIC_CR, PDMIC_CR_ENPDM_MASK, val);
+
+ return 0;
+}
+
+static const struct snd_soc_dai_ops atmel_pdmic_codec_dai_ops = {
+ .hw_params = atmel_pdmic_codec_dai_hw_params,
+ .prepare = atmel_pdmic_codec_dai_prepare,
+ .trigger = atmel_pdmic_codec_dai_trigger,
+};
+
+#define ATMEL_PDMIC_CODEC_DAI_NAME "atmel-pdmic-hifi"
+
+static struct snd_soc_dai_driver atmel_pdmic_codec_dai = {
+ .name = ATMEL_PDMIC_CODEC_DAI_NAME,
+ .capture = {
+ .stream_name = "Capture",
+ .channels_min = 1,
+ .channels_max = 1,
+ .rates = SNDRV_PCM_RATE_KNOT,
+ .formats = ATMEL_PDMIC_FORMATS,
+ },
+ .ops = &atmel_pdmic_codec_dai_ops,
+};
+
+/* ASoC sound card */
+static int atmel_pdmic_asoc_card_init(struct device *dev,
+ struct snd_soc_card *card)
+{
+ struct snd_soc_dai_link *dai_link;
+ struct atmel_pdmic *dd = snd_soc_card_get_drvdata(card);
+
+ dai_link = devm_kzalloc(dev, sizeof(*dai_link), GFP_KERNEL);
+ if (!dai_link)
+ return -ENOMEM;
+
+ dai_link->name = "PDMIC";
+ dai_link->stream_name = "PDMIC PCM";
+ dai_link->codec_dai_name = ATMEL_PDMIC_CODEC_DAI_NAME;
+ dai_link->cpu_dai_name = dev_name(dev);
+ dai_link->codec_name = dev_name(dev);
+ dai_link->platform_name = dev_name(dev);
+
+ card->dai_link = dai_link;
+ card->num_links = 1;
+ card->name = dd->pdata->card_name;
+ card->dev = dev;
+
+ return 0;
+}
+
+static void atmel_pdmic_get_sample_rate(struct atmel_pdmic *dd,
+ unsigned int *rate_min, unsigned int *rate_max)
+{
+ u32 mic_min_freq = dd->pdata->mic_min_freq;
+ u32 mic_max_freq = dd->pdata->mic_max_freq;
+ u32 clk_max_rate = (u32)(clk_get_rate(dd->pclk) >> 1);
+ u32 clk_min_rate = (u32)(clk_get_rate(dd->gclk) >> 8);
+
+ if (mic_max_freq > clk_max_rate)
+ mic_max_freq = clk_max_rate;
+
+ if (mic_min_freq < clk_min_rate)
+ mic_min_freq = clk_min_rate;
+
+ *rate_min = DIV_ROUND_CLOSEST(mic_min_freq, 128);
+ *rate_max = mic_max_freq >> 6;
+}
+
+/* PDMIC interrupt handler */
+static irqreturn_t atmel_pdmic_interrupt(int irq, void *dev_id)
+{
+ struct atmel_pdmic *dd = (struct atmel_pdmic *)dev_id;
+ u32 pdmic_isr;
+ irqreturn_t ret = IRQ_NONE;
+
+ regmap_read(dd->regmap, PDMIC_ISR, &pdmic_isr);
+
+ if (pdmic_isr & PDMIC_ISR_OVRE) {
+ regmap_update_bits(dd->regmap, PDMIC_CR, PDMIC_CR_ENPDM_MASK,
+ PDMIC_CR_ENPDM_DIS << PDMIC_CR_ENPDM_SHIFT);
+
+ snd_pcm_stop_xrun(dd->substream);
+
+ ret = IRQ_HANDLED;
+ }
+
+ return ret;
+}
+
+/* regmap configuration */
+#define ATMEL_PDMIC_REG_MAX 0x124
+static const struct regmap_config atmel_pdmic_regmap_config = {
+ .reg_bits = 32,
+ .reg_stride = 4,
+ .val_bits = 32,
+ .max_register = ATMEL_PDMIC_REG_MAX,
+};
+
+static int atmel_pdmic_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct atmel_pdmic *dd;
+ struct resource *res;
+ void __iomem *io_base;
+ const struct atmel_pdmic_pdata *pdata;
+ struct snd_soc_card *card;
+ unsigned int rate_min, rate_max;
+ int ret;
+
+ pdata = atmel_pdmic_dt_init(dev);
+ if (IS_ERR(pdata))
+ return PTR_ERR(pdata);
+
+ dd = devm_kzalloc(dev, sizeof(*dd), GFP_KERNEL);
+ if (!dd)
+ return -ENOMEM;
+
+ dd->pdata = pdata;
+
+ dd->irq = platform_get_irq(pdev, 0);
+ if (dd->irq < 0) {
+ ret = dd->irq;
+ dev_err(dev, "failed to could not get irq: %d\n", ret);
+ return ret;
+ }
+
+ dd->pclk = devm_clk_get(dev, "pclk");
+ if (IS_ERR(dd->pclk)) {
+ ret = PTR_ERR(dd->pclk);
+ dev_err(dev, "failed to get peripheral clock: %d\n", ret);
+ return ret;
+ }
+
+ dd->gclk = devm_clk_get(dev, "gclk");
+ if (IS_ERR(dd->gclk)) {
+ ret = PTR_ERR(dd->gclk);
+ dev_err(dev, "failed to get GCK: %d\n", ret);
+ return ret;
+ }
+
+ /* The gclk clock frequency must always be tree times
+ * lower than the pclk clock frequency
+ */
+ ret = clk_set_rate(dd->gclk, clk_get_rate(dd->pclk)/3);
+ if (ret) {
+ dev_err(dev, "failed to set GCK clock rate: %d\n", ret);
+ return ret;
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(dev, "no memory resource\n");
+ return -ENXIO;
+ }
+
+ io_base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(io_base)) {
+ ret = PTR_ERR(io_base);
+ dev_err(dev, "failed to remap register memory: %d\n", ret);
+ return ret;
+ }
+
+ dd->phy_base = res->start;
+
+ dd->regmap = devm_regmap_init_mmio(dev, io_base,
+ &atmel_pdmic_regmap_config);
+ if (IS_ERR(dd->regmap)) {
+ ret = PTR_ERR(dd->regmap);
+ dev_err(dev, "failed to init register map: %d\n", ret);
+ return ret;
+ }
+
+ ret = devm_request_irq(dev, dd->irq, atmel_pdmic_interrupt, 0,
+ "PDMIC", (void *)dd);
+ if (ret < 0) {
+ dev_err(dev, "can't register ISR for IRQ %u (ret=%i)\n",
+ dd->irq, ret);
+ return ret;
+ }
+
+ /* Get the minimal and maximal sample rate that micphone supports */
+ atmel_pdmic_get_sample_rate(dd, &rate_min, &rate_max);
+
+ /* register cpu dai */
+ atmel_pdmic_cpu_dai.capture.rate_min = rate_min;
+ atmel_pdmic_cpu_dai.capture.rate_max = rate_max;
+ ret = devm_snd_soc_register_component(dev,
+ &atmel_pdmic_cpu_dai_component,
+ &atmel_pdmic_cpu_dai, 1);
+ if (ret) {
+ dev_err(dev, "could not register CPU DAI: %d\n", ret);
+ return ret;
+ }
+
+ /* register platform */
+ ret = devm_snd_dmaengine_pcm_register(dev,
+ &atmel_pdmic_dmaengine_pcm_config,
+ 0);
+ if (ret) {
+ dev_err(dev, "could not register platform: %d\n", ret);
+ return ret;
+ }
+
+ /* register codec and codec dai */
+ atmel_pdmic_codec_dai.capture.rate_min = rate_min;
+ atmel_pdmic_codec_dai.capture.rate_max = rate_max;
+ ret = snd_soc_register_codec(dev, &soc_codec_dev_pdmic,
+ &atmel_pdmic_codec_dai, 1);
+ if (ret) {
+ dev_err(dev, "could not register codec: %d\n", ret);
+ return ret;
+ }
+
+ /* register sound card */
+ card = devm_kzalloc(dev, sizeof(*card), GFP_KERNEL);
+ if (!card) {
+ ret = -ENOMEM;
+ goto unregister_codec;
+ }
+
+ snd_soc_card_set_drvdata(card, dd);
+ platform_set_drvdata(pdev, card);
+
+ ret = atmel_pdmic_asoc_card_init(dev, card);
+ if (ret) {
+ dev_err(dev, "failed to init sound card: %d\n", ret);
+ goto unregister_codec;
+ }
+
+ ret = devm_snd_soc_register_card(dev, card);
+ if (ret) {
+ dev_err(dev, "failed to register sound card: %d\n", ret);
+ goto unregister_codec;
+ }
+
+ return 0;
+
+unregister_codec:
+ snd_soc_unregister_codec(dev);
+ return ret;
+}
+
+static int atmel_pdmic_remove(struct platform_device *pdev)
+{
+ snd_soc_unregister_codec(&pdev->dev);
+ return 0;
+}
+
+static struct platform_driver atmel_pdmic_driver = {
+ .driver = {
+ .name = "atmel-pdmic",
+ .of_match_table = of_match_ptr(atmel_pdmic_of_match),
+ .pm = &snd_soc_pm_ops,
+ },
+ .probe = atmel_pdmic_probe,
+ .remove = atmel_pdmic_remove,
+};
+module_platform_driver(atmel_pdmic_driver);
+
+MODULE_DESCRIPTION("Atmel PDMIC driver under ALSA SoC architecture");
+MODULE_AUTHOR("Songjun Wu <[email protected]>");
+MODULE_LICENSE("GPL v2");
diff --git a/sound/soc/atmel/atmel-pdmic.h b/sound/soc/atmel/atmel-pdmic.h
new file mode 100644
index 0000000..4527ac7
--- /dev/null
+++ b/sound/soc/atmel/atmel-pdmic.h
@@ -0,0 +1,80 @@
+#ifndef __ATMEL_PDMIC_H_
+#define __ATMEL_PDMIC_H_
+
+#include <linux/bitops.h>
+
+#define PDMIC_CR 0x00000000
+
+#define PDMIC_CR_SWRST 0x1
+#define PDMIC_CR_SWRST_MASK BIT(0)
+#define PDMIC_CR_SWRST_SHIFT (0)
+
+#define PDMIC_CR_ENPDM_DIS 0x0
+#define PDMIC_CR_ENPDM_EN 0x1
+#define PDMIC_CR_ENPDM_MASK BIT(4)
+#define PDMIC_CR_ENPDM_SHIFT (4)
+
+#define PDMIC_MR 0x00000004
+
+#define PDMIC_MR_CLKS_PCK 0x0
+#define PDMIC_MR_CLKS_GCK 0x1
+#define PDMIC_MR_CLKS_MASK BIT(4)
+#define PDMIC_MR_CLKS_SHIFT (4)
+
+#define PDMIC_MR_PRESCAL_MASK GENMASK(14, 8)
+#define PDMIC_MR_PRESCAL_SHIFT (8)
+
+#define PDMIC_CDR 0x00000014
+
+#define PDMIC_IER 0x00000018
+#define PDMIC_IER_OVRE BIT(25)
+
+#define PDMIC_IDR 0x0000001c
+#define PDMIC_IDR_OVRE BIT(25)
+
+#define PDMIC_IMR 0x00000020
+
+#define PDMIC_ISR 0x00000024
+#define PDMIC_ISR_OVRE BIT(25)
+
+#define PDMIC_DSPR0 0x00000058
+
+#define PDMIC_DSPR0_HPFBYP_DIS 0x1
+#define PDMIC_DSPR0_HPFBYP_EN 0x0
+#define PDMIC_DSPR0_HPFBYP_MASK BIT(1)
+#define PDMIC_DSPR0_HPFBYP_SHIFT (1)
+
+#define PDMIC_DSPR0_SINBYP_DIS 0x1
+#define PDMIC_DSPR0_SINBYP_EN 0x0
+#define PDMIC_DSPR0_SINBYP_MASK BIT(2)
+#define PDMIC_DSPR0_SINBYP_SHIFT (2)
+
+#define PDMIC_DSPR0_SIZE_16_BITS 0x0
+#define PDMIC_DSPR0_SIZE_32_BITS 0x1
+#define PDMIC_DSPR0_SIZE_MASK BIT(3)
+#define PDMIC_DSPR0_SIZE_SHIFT (3)
+
+#define PDMIC_DSPR0_OSR_128 0x0
+#define PDMIC_DSPR0_OSR_64 0x1
+#define PDMIC_DSPR0_OSR_MASK GENMASK(6, 4)
+#define PDMIC_DSPR0_OSR_SHIFT (4)
+
+#define PDMIC_DSPR0_SCALE_MASK GENMASK(11, 8)
+#define PDMIC_DSPR0_SCALE_SHIFT (8)
+
+#define PDMIC_DSPR0_SHIFT_MASK GENMASK(15, 12)
+#define PDMIC_DSPR0_SHIFT_SHIFT (12)
+
+#define PDMIC_DSPR1 0x0000005c
+
+#define PDMIC_DSPR1_DGAIN_MASK GENMASK(14, 0)
+#define PDMIC_DSPR1_DGAIN_SHIFT (0)
+
+#define PDMIC_DSPR1_OFFSET_MASK GENMASK(31, 16)
+#define PDMIC_DSPR1_OFFSET_SHIFT (16)
+
+#define PDMIC_WPMR 0x000000e4
+
+#define PDMIC_WPSR 0x000000e8
+
+#endif
--
1.7.9.5
DT binding documentation for this new ASoC driver.
Signed-off-by: Songjun Wu <[email protected]>
---
.../devicetree/bindings/sound/atmel-pdmic.txt | 55 ++++++++++++++++++++
1 file changed, 55 insertions(+)
create mode 100644 Documentation/devicetree/bindings/sound/atmel-pdmic.txt
diff --git a/Documentation/devicetree/bindings/sound/atmel-pdmic.txt b/Documentation/devicetree/bindings/sound/atmel-pdmic.txt
new file mode 100644
index 0000000..e0875f1
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/atmel-pdmic.txt
@@ -0,0 +1,55 @@
+* Atmel PDMIC driver under ALSA SoC architecture
+
+Required properties:
+- compatible
+ Should be "atmel,sama5d2-pdmic".
+- reg
+ Should contain PDMIC registers location and length.
+- interrupts
+ Should contain the IRQ line for the PDMIC.
+- dmas
+ One DMA specifiers as described in atmel-dma.txt and dma.txt files.
+- dma-names
+ Must be "rx".
+- clock-names
+ Required elements:
+ - "pclk" peripheral clock
+ - "gclk" generated clock
+- clocks
+ Must contain an entry for each required entry in clock-names.
+ Please refer to clock-bindings.txt.
+- atmel,mic-min-freq
+ The minimal frequency that the micphone supports.
+- atmel,mic-max-freq
+ The maximal frequency that the micphone supports.
+
+Optional properties:
+- pinctrl-names, pinctrl-0
+ Please refer to pinctrl-bindings.txt.
+- atmel,model
+ The user-visible name of this sound card.
+ The default value is "PDMIC".
+- atmel,mic-offset
+ The offset that should be added.
+ The range is from -32768 to 32767.
+ The default value is 0.
+
+Example:
+ pdmic@f8018000 {
+ compatible = "atmel,sama5d2-pdmic";
+ reg = <0xf8018000 0x124>;
+ interrupts = <48 IRQ_TYPE_LEVEL_HIGH 7>;
+ dmas = <&dma0
+ (AT91_XDMAC_DT_MEM_IF(0) | AT91_XDMAC_DT_PER_IF(1)
+ | AT91_XDMAC_DT_PERID(50))>;
+ dma-names = "rx";
+ clocks = <&pdmic_clk>, <&pdmic_gclk>;
+ clock-names = "pclk", "gclk";
+
+ pinctrl-names = "default";
+ pinctrl-0 = <&pinctrl_pdmic_default>;
+ atmel,model = "PDMIC @ sama5d2_xplained";
+ atmel,mic-min-freq = <1000000>;
+ atmel,mic-max-freq = <3246000>;
+ atmel,mic-offset = <0x0>;
+ };
--
1.7.9.5
On Mon, Dec 14, 2015 at 04:15:39PM +0800, Songjun Wu wrote:
> Add driver for the Pulse Density Modulation Interface
> Controller. It comes with digitallly controlled gain,
> a High-Pass and a SINCC filter.
This looks basically OK but there's a *lot* of weird coding style issues
in here. It's really all that, nothing too serious that I noticed -
I've pointed out some of the patterns below not every individual issue.
> + for (i = 0; i < ARRAY_SIZE(mic_gain_table); i++) {
> + if ((mic_gain_table[i].dgain == dgain_val)
> + && (mic_gain_table[i].scale == scale_val))
> + ucontrol->value.integer.value[0] = i;
> + }
This indentation is really weird, why is the && aligned with the if?
> + snd_soc_update_bits(codec, PDMIC_DSPR1,
> + PDMIC_DSPR1_OFFSET_MASK,
> + (u32)(dd->pdata->mic_offset << PDMIC_DSPR1_OFFSET_SHIFT));
These are weird too, I'd expect the second line to be part of the first.
> +static struct regmap *atmel_pdmic_codec_get_remap(struct device *dev)
> +{
> + return dev_get_regmap(dev, NULL);
> +}
This is (or should be) the default in the core.
> + if ((fs < rate_min) || (fs > rate_max)) {
> + dev_err(codec->dev,
> + "sample rate is %dHz, min rate is %dHz, max rate is %dHz\n",
> + fs, rate_min, rate_max);
This too, alignment after the (.
> + if (bits == 16)
> + dspr0_val = (PDMIC_DSPR0_SIZE_16_BITS
> + << PDMIC_DSPR0_SIZE_SHIFT);
> + else if (bits == 32)
> + dspr0_val = (PDMIC_DSPR0_SIZE_32_BITS
> + << PDMIC_DSPR0_SIZE_SHIFT);
> + else
> + return -EINVAL;
This looks like it should be a switch statement.
On 12/16/2015 20:27, Mark Brown wrote:
> On Mon, Dec 14, 2015 at 04:15:39PM +0800, Songjun Wu wrote:
>
>> Add driver for the Pulse Density Modulation Interface
>> Controller. It comes with digitallly controlled gain,
>> a High-Pass and a SINCC filter.
>
> This looks basically OK but there's a *lot* of weird coding style issues
> in here. It's really all that, nothing too serious that I noticed -
> I've pointed out some of the patterns below not every individual issue.
>
>> + for (i = 0; i < ARRAY_SIZE(mic_gain_table); i++) {
>> + if ((mic_gain_table[i].dgain == dgain_val)
>> + && (mic_gain_table[i].scale == scale_val))
>> + ucontrol->value.integer.value[0] = i;
>> + }
>
> This indentation is really weird, why is the && aligned with the if?
>
Accept.
>> + snd_soc_update_bits(codec, PDMIC_DSPR1,
>> + PDMIC_DSPR1_OFFSET_MASK,
>> + (u32)(dd->pdata->mic_offset << PDMIC_DSPR1_OFFSET_SHIFT));
>
> These are weird too, I'd expect the second line to be part of the first.
>
>> +static struct regmap *atmel_pdmic_codec_get_remap(struct device *dev)
>> +{
>> + return dev_get_regmap(dev, NULL);
>> +}
>
> This is (or should be) the default in the core.
>
You are right. The core has initialized the regmap in function
snd_soc_component_add_unlocked.
This function can be removed.
Thank you.
>> + if ((fs < rate_min) || (fs > rate_max)) {
>> + dev_err(codec->dev,
>> + "sample rate is %dHz, min rate is %dHz, max rate is %dHz\n",
>> + fs, rate_min, rate_max);
>
> This too, alignment after the (.
>
Accept.
>> + if (bits == 16)
>> + dspr0_val = (PDMIC_DSPR0_SIZE_16_BITS
>> + << PDMIC_DSPR0_SIZE_SHIFT);
>> + else if (bits == 32)
>> + dspr0_val = (PDMIC_DSPR0_SIZE_32_BITS
>> + << PDMIC_DSPR0_SIZE_SHIFT);
>> + else
>> + return -EINVAL;
>
> This looks like it should be a switch statement.
>
Accept.