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Subject[PATCH v3 3/6] ASoC: atmel: mchp-pdmc: add PDMC driver
Date
The Pulse Density Microphone Controller (PDMC) interfaces up to 4 digital
microphones having Pulse Density Modulated (PDM) outputs. It generates a
single clock line and samples 1 or 2 data lines. The signal path includes
an audio grade programmable decimation filter and outputs 24-bit audio
words on the APB bus.

Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
---

Changes in v3:
- none

Changes in v2:
- replaced included file dt-bindings/sound/mchp,pdmc.h wih
dt-bindings/sound/microchip,pdmc.h

sound/soc/atmel/Kconfig | 16 +
sound/soc/atmel/Makefile | 2 +
sound/soc/atmel/mchp-pdmc.c | 1084 +++++++++++++++++++++++++++++++++++
3 files changed, 1102 insertions(+)
create mode 100644 sound/soc/atmel/mchp-pdmc.c

diff --git a/sound/soc/atmel/Kconfig b/sound/soc/atmel/Kconfig
index 8617793ed955..795c0b0b527a 100644
--- a/sound/soc/atmel/Kconfig
+++ b/sound/soc/atmel/Kconfig
@@ -160,4 +160,20 @@ config SND_MCHP_SOC_SPDIFRX

This S/PDIF RX driver is compliant with IEC-60958 standard and
includes programmable User Data and Channel Status fields.
+
+config SND_MCHP_SOC_PDMC
+ tristate "Microchip ASoC driver for boards using PDMC"
+ depends on OF && (ARCH_AT91 || COMPILE_TEST)
+ select SND_SOC_GENERIC_DMAENGINE_PCM
+ select REGMAP_MMIO
+ help
+ Say Y or M if you want to add support for Microchip ASoC PDMC driver on the
+ following Microchip platforms:
+ - sama7g5
+
+ The Pulse Density Microphone Controller (PDMC) interfaces up to 4 digital
+ microphones PDM outputs. It generates a single clock line and samples 1 or
+ 2 data lines. The signal path includes an audio grade programmable
+ decimation filter and outputs 24-bit audio words.
+
endif
diff --git a/sound/soc/atmel/Makefile b/sound/soc/atmel/Makefile
index 016188397210..043097a08ea8 100644
--- a/sound/soc/atmel/Makefile
+++ b/sound/soc/atmel/Makefile
@@ -7,6 +7,7 @@ snd-soc-atmel-i2s-objs := atmel-i2s.o
snd-soc-mchp-i2s-mcc-objs := mchp-i2s-mcc.o
snd-soc-mchp-spdiftx-objs := mchp-spdiftx.o
snd-soc-mchp-spdifrx-objs := mchp-spdifrx.o
+snd-soc-mchp-pdmc-objs := mchp-pdmc.o

# pdc and dma need to both be built-in if any user of
# ssc is built-in.
@@ -21,6 +22,7 @@ obj-$(CONFIG_SND_ATMEL_SOC_I2S) += snd-soc-atmel-i2s.o
obj-$(CONFIG_SND_MCHP_SOC_I2S_MCC) += snd-soc-mchp-i2s-mcc.o
obj-$(CONFIG_SND_MCHP_SOC_SPDIFTX) += snd-soc-mchp-spdiftx.o
obj-$(CONFIG_SND_MCHP_SOC_SPDIFRX) += snd-soc-mchp-spdifrx.o
+obj-$(CONFIG_SND_MCHP_SOC_PDMC) += snd-soc-mchp-pdmc.o

# AT91 Machine Support
snd-soc-sam9g20-wm8731-objs := sam9g20_wm8731.o
diff --git a/sound/soc/atmel/mchp-pdmc.c b/sound/soc/atmel/mchp-pdmc.c
new file mode 100644
index 000000000000..c44636f6207d
--- /dev/null
+++ b/sound/soc/atmel/mchp-pdmc.c
@@ -0,0 +1,1084 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Driver for Microchip Pulse Density Microphone Controller (PDMC) interfaces
+//
+// Copyright (C) 2019-2022 Microchip Technology Inc. and its subsidiaries
+//
+// Author: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
+
+#include <dt-bindings/sound/microchip,pdmc.h>
+
+#include <linux/clk.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/regmap.h>
+
+#include <sound/core.h>
+#include <sound/dmaengine_pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/tlv.h>
+
+/*
+ * ---- PDMC Register map ----
+ */
+#define MCHP_PDMC_CR 0x00 /* Control Register */
+#define MCHP_PDMC_MR 0x04 /* Mode Register */
+#define MCHP_PDMC_CFGR 0x08 /* Configuration Register */
+#define MCHP_PDMC_RHR 0x0C /* Receive Holding Register */
+#define MCHP_PDMC_IER 0x14 /* Interrupt Enable Register */
+#define MCHP_PDMC_IDR 0x18 /* Interrupt Disable Register */
+#define MCHP_PDMC_IMR 0x1C /* Interrupt Mask Register */
+#define MCHP_PDMC_ISR 0x20 /* Interrupt Status Register */
+#define MCHP_PDMC_VER 0x50 /* Version Register */
+
+/*
+ * ---- Control Register (Write-only) ----
+ */
+#define MCHP_PDMC_CR_SWRST BIT(0) /* Software Reset */
+
+/*
+ * ---- Mode Register (Read/Write) ----
+ */
+#define MCHP_PDMC_MR_PDMCEN_MASK GENMASK(3, 0)
+#define MCHP_PDMC_MR_PDMCEN(ch) (BIT(ch) & MCHP_PDMC_MR_PDMCEN_MASK)
+
+#define MCHP_PDMC_MR_OSR_MASK GENMASK(17, 16)
+#define MCHP_PDMC_MR_OSR64 (1 << 16)
+#define MCHP_PDMC_MR_OSR128 (2 << 16)
+#define MCHP_PDMC_MR_OSR256 (3 << 16)
+
+#define MCHP_PDMC_MR_SINCORDER_MASK GENMASK(23, 20)
+#define MCHP_PDMC_MR_SINCORDER(order) (((order) << 20) & \
+ MCHP_PDMC_MR_SINCORDER_MASK)
+
+#define MCHP_PDMC_MR_SINC_OSR_MASK GENMASK(27, 24)
+#define MCHP_PDMC_MR_SINC_OSR_DIS (0 << 24)
+#define MCHP_PDMC_MR_SINC_OSR_8 (1 << 24)
+#define MCHP_PDMC_MR_SINC_OSR_16 (2 << 24)
+#define MCHP_PDMC_MR_SINC_OSR_32 (3 << 24)
+#define MCHP_PDMC_MR_SINC_OSR_64 (4 << 24)
+#define MCHP_PDMC_MR_SINC_OSR_128 (5 << 24)
+#define MCHP_PDMC_MR_SINC_OSR_256 (6 << 24)
+
+#define MCHP_PDMC_MR_CHUNK_MASK GENMASK(31, 28)
+#define MCHP_PDMC_MR_CHUNK(chunk) (((chunk) << 28) & \
+ MCHP_PDMC_MR_CHUNK_MASK)
+
+/*
+ * ---- Configuration Register (Read/Write) ----
+ */
+#define MCHP_PDMC_CFGR_BSSEL_MASK (BIT(0) | BIT(2) | BIT(4) | BIT(6))
+#define MCHP_PDMC_CFGR_BSSEL(ch) BIT((ch) * 2)
+
+#define MCHP_PDMC_CFGR_PDMSEL_MASK (BIT(16) | BIT(18) | BIT(20) | BIT(22))
+#define MCHP_PDMC_CFGR_PDMSEL(ch) BIT((ch) * 2 + 16)
+
+/*
+ * ---- Interrupt Enable/Disable/Mask/Status Registers ----
+ */
+#define MCHP_PDMC_IR_RXRDY BIT(0)
+#define MCHP_PDMC_IR_RXEMPTY BIT(1)
+#define MCHP_PDMC_IR_RXFULL BIT(2)
+#define MCHP_PDMC_IR_RXCHUNK BIT(3)
+#define MCHP_PDMC_IR_RXUDR BIT(4)
+#define MCHP_PDMC_IR_RXOVR BIT(5)
+
+/*
+ * ---- Version Register (Read-only) ----
+ */
+#define MCHP_PDMC_VER_VERSION GENMASK(11, 0)
+
+#define MCHP_PDMC_MAX_CHANNELS 4
+#define MCHP_PDMC_DS_NO 2
+#define MCHP_PDMC_EDGE_NO 2
+
+struct mic_map {
+ int ds_pos;
+ int clk_edge;
+};
+
+struct mchp_pdmc_chmap {
+ struct snd_pcm_chmap_elem *chmap;
+ struct mchp_pdmc *dd;
+ struct snd_pcm *pcm;
+ struct snd_kcontrol *kctl;
+};
+
+struct mchp_pdmc {
+ struct mic_map channel_mic_map[MCHP_PDMC_MAX_CHANNELS];
+ struct device *dev;
+ struct snd_dmaengine_dai_dma_data addr;
+ struct regmap *regmap;
+ struct clk *pclk;
+ struct clk *gclk;
+ u32 pdmcen;
+ int mic_no;
+ int sinc_order;
+ bool audio_filter_en;
+ u8 gclk_enabled:1;
+};
+
+static const char *const mchp_pdmc_sinc_filter_order_text[] = {
+ "1", "2", "3", "4", "5"
+};
+
+static const unsigned int mchp_pdmc_sinc_filter_order_values[] = {
+ 1, 2, 3, 4, 5,
+};
+
+static const struct soc_enum mchp_pdmc_sinc_filter_order_enum = {
+ .items = ARRAY_SIZE(mchp_pdmc_sinc_filter_order_text),
+ .texts = mchp_pdmc_sinc_filter_order_text,
+ .values = mchp_pdmc_sinc_filter_order_values,
+};
+
+static int mchp_pdmc_sinc_order_get(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *uvalue)
+{
+ struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
+ struct mchp_pdmc *dd = snd_soc_component_get_drvdata(component);
+ struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
+ unsigned int item;
+
+ item = snd_soc_enum_val_to_item(e, dd->sinc_order);
+ uvalue->value.enumerated.item[0] = item;
+
+ return 0;
+}
+
+static int mchp_pdmc_sinc_order_put(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *uvalue)
+{
+ struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
+ struct mchp_pdmc *dd = snd_soc_component_get_drvdata(component);
+ struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
+ unsigned int *item = uvalue->value.enumerated.item;
+ unsigned int val;
+
+ if (item[0] >= e->items)
+ return -EINVAL;
+
+ val = snd_soc_enum_item_to_val(e, item[0]) << e->shift_l;
+ if (val == dd->sinc_order)
+ return 0;
+
+ dd->sinc_order = val;
+
+ return 1;
+}
+
+static int mchp_pdmc_af_get(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *uvalue)
+{
+ struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
+ struct mchp_pdmc *dd = snd_soc_component_get_drvdata(component);
+
+ uvalue->value.integer.value[0] = !!dd->audio_filter_en;
+
+ return 0;
+}
+
+static int mchp_pdmc_af_put(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *uvalue)
+{
+ struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
+ struct mchp_pdmc *dd = snd_soc_component_get_drvdata(component);
+ bool af = uvalue->value.integer.value ? true : false;
+
+ if (dd->audio_filter_en == af)
+ return 0;
+
+ dd->audio_filter_en = af;
+
+ return 1;
+}
+
+static int mchp_pdmc_chmap_ctl_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
+{
+ struct mchp_pdmc_chmap *info = snd_kcontrol_chip(kcontrol);
+
+ uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
+ uinfo->count = info->dd->mic_no;
+ uinfo->value.integer.min = 0;
+ uinfo->value.integer.max = SNDRV_CHMAP_RR; /* maxmimum 4 channels */
+ return 0;
+}
+
+static inline struct snd_pcm_substream *
+mchp_pdmc_chmap_substream(struct mchp_pdmc_chmap *info, unsigned int idx)
+{
+ struct snd_pcm_substream *s;
+
+ for (s = info->pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; s; s = s->next)
+ if (s->number == idx)
+ return s;
+ return NULL;
+}
+
+static struct snd_pcm_chmap_elem *mchp_pdmc_chmap_get(struct snd_pcm_substream *substream,
+ struct mchp_pdmc_chmap *ch_info)
+{
+ struct snd_pcm_chmap_elem *map;
+
+ for (map = ch_info->chmap; map->channels; map++) {
+ if (map->channels == substream->runtime->channels)
+ return map;
+ }
+ return NULL;
+}
+
+static int mchp_pdmc_chmap_ctl_get(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol)
+{
+ struct mchp_pdmc_chmap *info = snd_kcontrol_chip(kcontrol);
+ struct mchp_pdmc *dd = info->dd;
+ unsigned int idx = snd_ctl_get_ioffidx(kcontrol, &ucontrol->id);
+ struct snd_pcm_substream *substream;
+ const struct snd_pcm_chmap_elem *map;
+ int i;
+ u32 cfgr_val = 0;
+
+ if (!info->chmap)
+ return -EINVAL;
+ substream = mchp_pdmc_chmap_substream(info, idx);
+ if (!substream)
+ return -ENODEV;
+ memset(ucontrol->value.integer.value, 0, sizeof(long) * info->dd->mic_no);
+ if (!substream->runtime)
+ return 0; /* no channels set */
+
+ map = mchp_pdmc_chmap_get(substream, info);
+ if (!map)
+ return -EINVAL;
+
+ for (i = 0; i < map->channels; i++) {
+ int map_idx = map->channels == 1 ? map->map[i] - SNDRV_CHMAP_MONO :
+ map->map[i] - SNDRV_CHMAP_FL;
+
+ /* make sure the reported channel map is the real one, so write the map */
+ if (dd->channel_mic_map[map_idx].ds_pos)
+ cfgr_val |= MCHP_PDMC_CFGR_PDMSEL(i);
+ if (dd->channel_mic_map[map_idx].clk_edge)
+ cfgr_val |= MCHP_PDMC_CFGR_BSSEL(i);
+
+ ucontrol->value.integer.value[i] = map->map[i];
+ }
+
+ regmap_write(dd->regmap, MCHP_PDMC_CFGR, cfgr_val);
+
+ return 0;
+}
+
+static int mchp_pdmc_chmap_ctl_put(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol)
+{
+ struct mchp_pdmc_chmap *info = snd_kcontrol_chip(kcontrol);
+ struct mchp_pdmc *dd = info->dd;
+ unsigned int idx = snd_ctl_get_ioffidx(kcontrol, &ucontrol->id);
+ struct snd_pcm_substream *substream;
+ struct snd_pcm_chmap_elem *map;
+ u32 cfgr_val = 0;
+ int i;
+
+ if (!info->chmap)
+ return -EINVAL;
+ substream = mchp_pdmc_chmap_substream(info, idx);
+ if (!substream)
+ return -ENODEV;
+
+ map = mchp_pdmc_chmap_get(substream, info);
+ if (!map)
+ return -EINVAL;
+
+ for (i = 0; i < map->channels; i++) {
+ int map_idx;
+
+ map->map[i] = ucontrol->value.integer.value[i];
+ map_idx = map->channels == 1 ? map->map[i] - SNDRV_CHMAP_MONO :
+ map->map[i] - SNDRV_CHMAP_FL;
+
+ /* configure IP for the desired channel map */
+ if (dd->channel_mic_map[map_idx].ds_pos)
+ cfgr_val |= MCHP_PDMC_CFGR_PDMSEL(i);
+ if (dd->channel_mic_map[map_idx].clk_edge)
+ cfgr_val |= MCHP_PDMC_CFGR_BSSEL(i);
+ }
+
+ regmap_write(dd->regmap, MCHP_PDMC_CFGR, cfgr_val);
+
+ return 0;
+}
+
+static void mchp_pdmc_chmap_ctl_private_free(struct snd_kcontrol *kcontrol)
+{
+ struct mchp_pdmc_chmap *info = snd_kcontrol_chip(kcontrol);
+
+ info->pcm->streams[SNDRV_PCM_STREAM_CAPTURE].chmap_kctl = NULL;
+ kfree(info);
+}
+
+static int mchp_pdmc_chmap_ctl_tlv(struct snd_kcontrol *kcontrol, int op_flag,
+ unsigned int size, unsigned int __user *tlv)
+{
+ struct mchp_pdmc_chmap *info = snd_kcontrol_chip(kcontrol);
+ const struct snd_pcm_chmap_elem *map;
+ unsigned int __user *dst;
+ int c, count = 0;
+
+ if (!info->chmap)
+ return -EINVAL;
+ if (size < 8)
+ return -ENOMEM;
+ if (put_user(SNDRV_CTL_TLVT_CONTAINER, tlv))
+ return -EFAULT;
+ size -= 8;
+ dst = tlv + 2;
+ for (map = info->chmap; map->channels; map++) {
+ int chs_bytes = map->channels * 4;
+
+ if (size < 8)
+ return -ENOMEM;
+ if (put_user(SNDRV_CTL_TLVT_CHMAP_VAR, dst) ||
+ put_user(chs_bytes, dst + 1))
+ return -EFAULT;
+ dst += 2;
+ size -= 8;
+ count += 8;
+ if (size < chs_bytes)
+ return -ENOMEM;
+ size -= chs_bytes;
+ count += chs_bytes;
+ for (c = 0; c < map->channels; c++) {
+ if (put_user(map->map[c], dst))
+ return -EFAULT;
+ dst++;
+ }
+ }
+ if (put_user(count, tlv + 1))
+ return -EFAULT;
+ return 0;
+}
+
+static const struct snd_kcontrol_new mchp_pdmc_snd_controls[] = {
+ SOC_SINGLE_BOOL_EXT("Audio Filter", 0, &mchp_pdmc_af_get, &mchp_pdmc_af_put),
+ {
+ .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+ .name = "SINC Filter Order",
+ .info = snd_soc_info_enum_double,
+ .get = mchp_pdmc_sinc_order_get,
+ .put = mchp_pdmc_sinc_order_put,
+ .private_value = (unsigned long)&mchp_pdmc_sinc_filter_order_enum,
+ },
+};
+
+static int mchp_pdmc_close(struct snd_soc_component *component,
+ struct snd_pcm_substream *substream)
+{
+ return snd_soc_add_component_controls(component, mchp_pdmc_snd_controls,
+ ARRAY_SIZE(mchp_pdmc_snd_controls));
+}
+
+static int mchp_pdmc_open(struct snd_soc_component *component,
+ struct snd_pcm_substream *substream)
+{
+ int i;
+
+ /* remove controls that can't be changed at runtime */
+ for (i = 0; i < ARRAY_SIZE(mchp_pdmc_snd_controls); i++) {
+ const struct snd_kcontrol_new *control = &mchp_pdmc_snd_controls[i];
+ struct snd_ctl_elem_id id;
+ struct snd_kcontrol *kctl;
+ int err;
+
+ if (component->name_prefix)
+ snprintf(id.name, sizeof(id.name), "%s %s", component->name_prefix,
+ control->name);
+ else
+ strscpy(id.name, control->name, sizeof(id.name));
+
+ id.numid = 0;
+ id.iface = control->iface;
+ id.device = control->device;
+ id.subdevice = control->subdevice;
+ id.index = control->index;
+ kctl = snd_ctl_find_id(component->card->snd_card, &id);
+ if (!kctl) {
+ dev_err(component->dev, "Failed to find %s\n", control->name);
+ continue;
+ }
+ err = snd_ctl_remove(component->card->snd_card, kctl);
+ if (err < 0) {
+ dev_err(component->dev, "%d: Failed to remove %s\n", err,
+ control->name);
+ continue;
+ }
+ }
+
+ return 0;
+}
+
+static const struct snd_soc_component_driver mchp_pdmc_dai_component = {
+ .name = "mchp-pdmc",
+ .controls = mchp_pdmc_snd_controls,
+ .num_controls = ARRAY_SIZE(mchp_pdmc_snd_controls),
+ .open = &mchp_pdmc_open,
+ .close = &mchp_pdmc_close,
+};
+
+static const unsigned int mchp_pdmc_1mic[] = {1};
+static const unsigned int mchp_pdmc_2mic[] = {1, 2};
+static const unsigned int mchp_pdmc_3mic[] = {1, 2, 3};
+static const unsigned int mchp_pdmc_4mic[] = {1, 2, 3, 4};
+
+static const struct snd_pcm_hw_constraint_list mchp_pdmc_chan_constr[] = {
+ {
+ .list = mchp_pdmc_1mic,
+ .count = ARRAY_SIZE(mchp_pdmc_1mic),
+ },
+ {
+ .list = mchp_pdmc_2mic,
+ .count = ARRAY_SIZE(mchp_pdmc_2mic),
+ },
+ {
+ .list = mchp_pdmc_3mic,
+ .count = ARRAY_SIZE(mchp_pdmc_3mic),
+ },
+ {
+ .list = mchp_pdmc_4mic,
+ .count = ARRAY_SIZE(mchp_pdmc_4mic),
+ },
+};
+
+static int mchp_pdmc_startup(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *dai)
+{
+ struct mchp_pdmc *dd = snd_soc_dai_get_drvdata(dai);
+ int ret;
+
+ ret = clk_prepare_enable(dd->pclk);
+ if (ret) {
+ dev_err(dd->dev, "failed to enable the peripheral clock: %d\n", ret);
+ return ret;
+ }
+
+ regmap_write(dd->regmap, MCHP_PDMC_CR, MCHP_PDMC_CR_SWRST);
+
+ snd_pcm_hw_constraint_list(substream->runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
+ &mchp_pdmc_chan_constr[dd->mic_no - 1]);
+
+ return 0;
+}
+
+static void mchp_pdmc_shutdown(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *dai)
+{
+ struct mchp_pdmc *dd = snd_soc_dai_get_drvdata(dai);
+
+ clk_disable_unprepare(dd->pclk);
+}
+
+static int mchp_pdmc_dai_probe(struct snd_soc_dai *dai)
+{
+ struct mchp_pdmc *dd = snd_soc_dai_get_drvdata(dai);
+
+ snd_soc_dai_init_dma_data(dai, NULL, &dd->addr);
+
+ return 0;
+}
+
+static int mchp_pdmc_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
+{
+ unsigned int fmt_master = fmt & SND_SOC_DAIFMT_MASTER_MASK;
+ unsigned int fmt_format = fmt & SND_SOC_DAIFMT_FORMAT_MASK;
+
+ /* IP needs to be bitclock master */
+ if (fmt_master != SND_SOC_DAIFMT_CBS_CFS &&
+ fmt_master != SND_SOC_DAIFMT_CBS_CFM)
+ return -EINVAL;
+
+ /* IP supports only PDM interface */
+ if (fmt_format != SND_SOC_DAIFMT_PDM)
+ return -EINVAL;
+
+ return 0;
+}
+
+static u32 mchp_pdmc_mr_set_osr(int audio_filter_en, unsigned int osr)
+{
+ if (audio_filter_en) {
+ switch (osr) {
+ case 64:
+ return MCHP_PDMC_MR_OSR64;
+ case 128:
+ return MCHP_PDMC_MR_OSR128;
+ case 256:
+ return MCHP_PDMC_MR_OSR256;
+ }
+ } else {
+ switch (osr) {
+ case 8:
+ return MCHP_PDMC_MR_SINC_OSR_8;
+ case 16:
+ return MCHP_PDMC_MR_SINC_OSR_16;
+ case 32:
+ return MCHP_PDMC_MR_SINC_OSR_32;
+ case 64:
+ return MCHP_PDMC_MR_SINC_OSR_64;
+ case 128:
+ return MCHP_PDMC_MR_SINC_OSR_128;
+ case 256:
+ return MCHP_PDMC_MR_SINC_OSR_256;
+ }
+ }
+ return 0;
+}
+
+static inline int mchp_pdmc_period_to_maxburst(int period_size)
+{
+ if (!(period_size % 8))
+ return 8;
+ if (!(period_size % 4))
+ return 4;
+ if (!(period_size % 2))
+ return 2;
+ return 1;
+}
+
+static struct snd_pcm_chmap_elem mchp_pdmc_std_chmaps[] = {
+ { .channels = 1,
+ .map = { SNDRV_CHMAP_MONO } },
+ { .channels = 2,
+ .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR } },
+ { .channels = 3,
+ .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
+ SNDRV_CHMAP_RL } },
+ { .channels = 4,
+ .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
+ SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
+ { }
+};
+
+static int mchp_pdmc_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params,
+ struct snd_soc_dai *dai)
+{
+ struct mchp_pdmc *dd = snd_soc_dai_get_drvdata(dai);
+ struct snd_soc_component *comp = dai->component;
+ unsigned long gclk_rate = 0;
+ unsigned long best_diff_rate = ~0UL;
+ unsigned int channels = params_channels(params);
+ unsigned int osr = 0, osr_start;
+ unsigned int fs = params_rate(params);
+ u32 mr_val = 0;
+ u32 cfgr_val = 0;
+ int i;
+ int ret;
+
+ dev_dbg(comp->dev, "%s() rate=%u format=%#x width=%u channels=%u\n",
+ __func__, params_rate(params), params_format(params),
+ params_width(params), params_channels(params));
+
+ if (channels > dd->mic_no) {
+ dev_err(comp->dev, "more channels %u than microphones %d\n",
+ channels, dd->mic_no);
+ return -EINVAL;
+ }
+
+ dd->pdmcen = 0;
+ for (i = 0; i < channels; i++) {
+ dd->pdmcen |= MCHP_PDMC_MR_PDMCEN(i);
+ if (dd->channel_mic_map[i].ds_pos)
+ cfgr_val |= MCHP_PDMC_CFGR_PDMSEL(i);
+ if (dd->channel_mic_map[i].clk_edge)
+ cfgr_val |= MCHP_PDMC_CFGR_BSSEL(i);
+ }
+
+ if (dd->gclk_enabled) {
+ clk_disable_unprepare(dd->gclk);
+ dd->gclk_enabled = 0;
+ }
+
+ for (osr_start = dd->audio_filter_en ? 64 : 8;
+ osr_start <= 256 && best_diff_rate; osr_start *= 2) {
+ long round_rate;
+ unsigned long diff_rate;
+
+ round_rate = clk_round_rate(dd->gclk,
+ (unsigned long)fs * 16 * osr_start);
+ if (round_rate < 0)
+ continue;
+ diff_rate = abs((fs * 16 * osr_start) - round_rate);
+ if (diff_rate < best_diff_rate) {
+ best_diff_rate = diff_rate;
+ osr = osr_start;
+ gclk_rate = fs * 16 * osr;
+ }
+ }
+ if (!gclk_rate) {
+ dev_err(comp->dev, "invalid sampling rate: %u\n", fs);
+ return -EINVAL;
+ }
+
+ /* set the rate */
+ ret = clk_set_rate(dd->gclk, gclk_rate);
+ if (ret) {
+ dev_err(comp->dev, "unable to set rate %lu to GCLK: %d\n",
+ gclk_rate, ret);
+ return ret;
+ }
+
+ mr_val |= mchp_pdmc_mr_set_osr(dd->audio_filter_en, osr);
+
+ mr_val |= MCHP_PDMC_MR_SINCORDER(dd->sinc_order);
+
+ dd->addr.maxburst = mchp_pdmc_period_to_maxburst(snd_pcm_lib_period_bytes(substream));
+ mr_val |= MCHP_PDMC_MR_CHUNK(dd->addr.maxburst);
+ dev_dbg(comp->dev, "maxburst set to %d\n", dd->addr.maxburst);
+
+ clk_prepare_enable(dd->gclk);
+ dd->gclk_enabled = 1;
+
+ snd_soc_component_update_bits(comp, MCHP_PDMC_MR,
+ MCHP_PDMC_MR_OSR_MASK |
+ MCHP_PDMC_MR_SINCORDER_MASK |
+ MCHP_PDMC_MR_SINC_OSR_MASK |
+ MCHP_PDMC_MR_CHUNK_MASK, mr_val);
+
+ snd_soc_component_write(comp, MCHP_PDMC_CFGR, cfgr_val);
+
+ return 0;
+}
+
+static int mchp_pdmc_hw_free(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *dai)
+{
+ struct mchp_pdmc *dd = snd_soc_dai_get_drvdata(dai);
+
+ if (dd->gclk_enabled) {
+ clk_disable_unprepare(dd->gclk);
+ dd->gclk_enabled = 0;
+ }
+
+ return 0;
+}
+
+static int mchp_pdmc_trigger(struct snd_pcm_substream *substream,
+ int cmd, struct snd_soc_dai *dai)
+{
+ struct mchp_pdmc *dd = snd_soc_dai_get_drvdata(dai);
+ struct snd_soc_component *cpu = dai->component;
+#ifdef DEBUG
+ u32 val;
+#endif
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ case SNDRV_PCM_TRIGGER_RESUME:
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ /* Enable overrun and underrun error interrupts */
+ regmap_write(dd->regmap, MCHP_PDMC_IER,
+ MCHP_PDMC_IR_RXOVR | MCHP_PDMC_IR_RXUDR);
+ snd_soc_component_update_bits(cpu, MCHP_PDMC_MR,
+ MCHP_PDMC_MR_PDMCEN_MASK,
+ dd->pdmcen);
+ break;
+ case SNDRV_PCM_TRIGGER_STOP:
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ /* Disable overrun and underrun error interrupts */
+ regmap_write(dd->regmap, MCHP_PDMC_IDR,
+ MCHP_PDMC_IR_RXOVR | MCHP_PDMC_IR_RXUDR);
+ snd_soc_component_update_bits(cpu, MCHP_PDMC_MR,
+ MCHP_PDMC_MR_PDMCEN_MASK, 0);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+#ifdef DEBUG
+ regmap_read(dd->regmap, MCHP_PDMC_MR, &val);
+ dev_dbg(dd->dev, "MR (0x%02x): 0x%08x\n", MCHP_PDMC_MR, val);
+ regmap_read(dd->regmap, MCHP_PDMC_CFGR, &val);
+ dev_dbg(dd->dev, "CFGR (0x%02x): 0x%08x\n", MCHP_PDMC_CFGR, val);
+ regmap_read(dd->regmap, MCHP_PDMC_IMR, &val);
+ dev_dbg(dd->dev, "IMR (0x%02x): 0x%08x\n", MCHP_PDMC_IMR, val);
+#endif
+
+ return 0;
+}
+
+static const struct snd_soc_dai_ops mchp_pdmc_dai_ops = {
+ .set_fmt = mchp_pdmc_set_fmt,
+ .startup = mchp_pdmc_startup,
+ .shutdown = mchp_pdmc_shutdown,
+ .hw_params = mchp_pdmc_hw_params,
+ .hw_free = mchp_pdmc_hw_free,
+ .trigger = mchp_pdmc_trigger,
+};
+
+static int mchp_pdmc_add_chmap_ctls(struct snd_pcm *pcm, struct mchp_pdmc *dd)
+{
+ struct mchp_pdmc_chmap *info;
+ struct snd_kcontrol_new knew = {
+ .iface = SNDRV_CTL_ELEM_IFACE_PCM,
+ .access = SNDRV_CTL_ELEM_ACCESS_READWRITE |
+ SNDRV_CTL_ELEM_ACCESS_TLV_READ |
+ SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK,
+ .info = mchp_pdmc_chmap_ctl_info,
+ .get = mchp_pdmc_chmap_ctl_get,
+ .put = mchp_pdmc_chmap_ctl_put,
+ .tlv.c = mchp_pdmc_chmap_ctl_tlv,
+ };
+ int err;
+
+ if (WARN_ON(pcm->streams[SNDRV_PCM_STREAM_CAPTURE].chmap_kctl))
+ return -EBUSY;
+ info = kzalloc(sizeof(*info), GFP_KERNEL);
+ if (!info)
+ return -ENOMEM;
+ info->pcm = pcm;
+ info->dd = dd;
+ info->chmap = mchp_pdmc_std_chmaps;
+ knew.name = "Capture Channel Map";
+ knew.device = pcm->device;
+ knew.count = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count;
+ info->kctl = snd_ctl_new1(&knew, info);
+ if (!info->kctl) {
+ kfree(info);
+ return -ENOMEM;
+ }
+ info->kctl->private_free = mchp_pdmc_chmap_ctl_private_free;
+ err = snd_ctl_add(pcm->card, info->kctl);
+ if (err < 0)
+ return err;
+ pcm->streams[SNDRV_PCM_STREAM_CAPTURE].chmap_kctl = info->kctl;
+ return 0;
+}
+
+static int mchp_pdmc_pcm_new(struct snd_soc_pcm_runtime *rtd,
+ struct snd_soc_dai *dai)
+{
+ struct mchp_pdmc *dd = snd_soc_dai_get_drvdata(dai);
+ int ret;
+
+ ret = mchp_pdmc_add_chmap_ctls(rtd->pcm, dd);
+ if (ret < 0) {
+ dev_err(dd->dev, "failed to add channel map controls: %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static struct snd_soc_dai_driver mchp_pdmc_dai = {
+ .probe = mchp_pdmc_dai_probe,
+ .capture = {
+ .stream_name = "Capture",
+ .channels_min = 1,
+ .channels_max = 4,
+ .rate_min = 8000,
+ .rate_max = 192000,
+ .rates = SNDRV_PCM_RATE_KNOT,
+ .formats = SNDRV_PCM_FMTBIT_S24_LE,
+ },
+ .ops = &mchp_pdmc_dai_ops,
+ .pcm_new = &mchp_pdmc_pcm_new,
+};
+
+/* PDMC interrupt handler */
+static irqreturn_t mchp_pdmc_interrupt(int irq, void *dev_id)
+{
+ struct mchp_pdmc *dd = (struct mchp_pdmc *)dev_id;
+ u32 isr, msr, pending;
+ irqreturn_t ret = IRQ_NONE;
+
+ regmap_read(dd->regmap, MCHP_PDMC_ISR, &isr);
+ regmap_read(dd->regmap, MCHP_PDMC_IMR, &msr);
+
+ pending = isr & msr;
+ dev_dbg(dd->dev, "ISR (0x%02x): 0x%08x, IMR (0x%02x): 0x%08x, pending: 0x%08x\n",
+ MCHP_PDMC_ISR, isr, MCHP_PDMC_IMR, msr, pending);
+ if (!pending)
+ return IRQ_NONE;
+
+ if (pending & MCHP_PDMC_IR_RXUDR) {
+ dev_warn(dd->dev, "underrun detected\n");
+ regmap_write(dd->regmap, MCHP_PDMC_IDR, MCHP_PDMC_IR_RXUDR);
+ ret = IRQ_HANDLED;
+ }
+ if (pending & MCHP_PDMC_IR_RXOVR) {
+ dev_warn(dd->dev, "overrun detected\n");
+ regmap_write(dd->regmap, MCHP_PDMC_IDR, MCHP_PDMC_IR_RXOVR);
+ ret = IRQ_HANDLED;
+ }
+
+ return ret;
+}
+
+/* regmap configuration */
+static bool mchp_pdmc_readable_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case MCHP_PDMC_MR:
+ case MCHP_PDMC_CFGR:
+ case MCHP_PDMC_IMR:
+ case MCHP_PDMC_ISR:
+ case MCHP_PDMC_VER:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static bool mchp_pdmc_writeable_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case MCHP_PDMC_CR:
+ case MCHP_PDMC_MR:
+ case MCHP_PDMC_CFGR:
+ case MCHP_PDMC_IER:
+ case MCHP_PDMC_IDR:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static bool mchp_pdmc_precious_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case MCHP_PDMC_RHR:
+ case MCHP_PDMC_ISR:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static const struct regmap_config mchp_pdmc_regmap_config = {
+ .reg_bits = 32,
+ .reg_stride = 4,
+ .val_bits = 32,
+ .max_register = MCHP_PDMC_VER,
+ .readable_reg = mchp_pdmc_readable_reg,
+ .writeable_reg = mchp_pdmc_writeable_reg,
+ .precious_reg = mchp_pdmc_precious_reg,
+};
+
+static int mchp_pdmc_dt_init(struct mchp_pdmc *dd)
+{
+ struct device_node *np = dd->dev->of_node;
+ bool mic_ch[MCHP_PDMC_DS_NO][MCHP_PDMC_EDGE_NO] = {0};
+ int i;
+ int ret;
+
+ if (!np) {
+ dev_err(dd->dev, "device node not found\n");
+ return -EINVAL;
+ }
+
+ dd->mic_no = of_property_count_u32_elems(np, "microchip,mic-pos");
+ if (dd->mic_no < 0) {
+ dev_err(dd->dev, "failed to get mchp,mic-pos: %d",
+ dd->mic_no);
+ return dd->mic_no;
+ }
+ if (!dd->mic_no || dd->mic_no % 2 ||
+ dd->mic_no / 2 > MCHP_PDMC_MAX_CHANNELS) {
+ dev_err(dd->dev, "invalid array length for mchp,mic-pos: %d",
+ dd->mic_no);
+ return -EINVAL;
+ }
+
+ dd->mic_no /= 2;
+
+ dev_info(dd->dev, "%d PDM microchopnes declared\n", dd->mic_no);
+
+ /* by default, we consider the order of microphones in mchp,mic-pos to
+ * be the same with the channel mapping; 1st microphone channel 0, 2nd
+ * microphone channel 1, etc.
+ */
+ for (i = 0; i < dd->mic_no; i++) {
+ int ds;
+ int edge;
+
+ ret = of_property_read_u32_index(np, "microchip,mic-pos", i * 2,
+ &ds);
+ if (ret) {
+ dev_err(dd->dev,
+ "failed to get value no %d value from microchip,mic-pos: %d",
+ i * 2, ret);
+ return ret;
+ }
+ if (ds >= MCHP_PDMC_DS_NO) {
+ dev_err(dd->dev,
+ "invalid DS index in microchip,mic-pos array: %d",
+ ds);
+ return -EINVAL;
+ }
+
+ ret = of_property_read_u32_index(np, "microchip,mic-pos", i * 2 + 1,
+ &edge);
+ if (ret) {
+ dev_err(dd->dev,
+ "failed to get value no %d value from microchip,mic-pos: %d",
+ i * 2 + 1, ret);
+ return ret;
+ }
+
+ if (edge != MCHP_PDMC_CLK_POSITIVE &&
+ edge != MCHP_PDMC_CLK_NEGATIVE) {
+ dev_err(dd->dev,
+ "invalid edge in microchip,mic-pos array: %d", edge);
+ return -EINVAL;
+ }
+ if (mic_ch[ds][edge]) {
+ dev_err(dd->dev,
+ "duplicated mic (DS %d, edge %d) in microchip,mic-pos array",
+ ds, edge);
+ return -EINVAL;
+ }
+ mic_ch[ds][edge] = true;
+ dd->channel_mic_map[i].ds_pos = ds;
+ dd->channel_mic_map[i].clk_edge = edge;
+ }
+
+ return 0;
+}
+
+/* used to clean the channel index found on RHR's MSB */
+static int mchp_pdmc_process(struct snd_pcm_substream *substream,
+ int channel, unsigned long hwoff,
+ void *buf, unsigned long bytes)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ u8 *dma_ptr = runtime->dma_area + hwoff +
+ channel * (runtime->dma_bytes / runtime->channels);
+ u8 *dma_ptr_end = dma_ptr + bytes;
+ unsigned int sample_size = samples_to_bytes(runtime, 1);
+
+ for (; dma_ptr < dma_ptr_end; dma_ptr += sample_size)
+ *dma_ptr = 0;
+
+ return 0;
+}
+
+static struct snd_dmaengine_pcm_config mchp_pdmc_config = {
+ .process = mchp_pdmc_process,
+};
+
+static int mchp_pdmc_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct mchp_pdmc *dd;
+ struct resource *res;
+ void __iomem *io_base;
+ u32 version;
+ int irq;
+ int ret;
+
+ dd = devm_kzalloc(dev, sizeof(*dd), GFP_KERNEL);
+ if (!dd)
+ return -ENOMEM;
+
+ dd->dev = &pdev->dev;
+ ret = mchp_pdmc_dt_init(dd);
+ if (ret < 0)
+ return ret;
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0) {
+ dev_err(dev, "failed to get irq: %d\n", irq);
+ return irq;
+ }
+
+ 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;
+ }
+
+ io_base = devm_platform_get_and_ioremap_resource(pdev, 0, &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->regmap = devm_regmap_init_mmio(dev, io_base,
+ &mchp_pdmc_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, irq, mchp_pdmc_interrupt, 0,
+ dev_name(&pdev->dev), (void *)dd);
+ if (ret < 0) {
+ dev_err(dev, "can't register ISR for IRQ %u (ret=%i)\n",
+ irq, ret);
+ return ret;
+ }
+
+ /* by default audio filter is enabled and the SINC Filter order
+ * will be set to the recommended value, 3
+ */
+ dd->audio_filter_en = true;
+ dd->sinc_order = 3;
+
+ dd->addr.addr = (dma_addr_t)res->start + MCHP_PDMC_RHR;
+ platform_set_drvdata(pdev, dd);
+
+ /* register platform */
+ ret = devm_snd_dmaengine_pcm_register(dev, &mchp_pdmc_config, 0);
+ if (ret) {
+ dev_err(dev, "could not register platform: %d\n", ret);
+ return ret;
+ }
+
+ ret = devm_snd_soc_register_component(dev, &mchp_pdmc_dai_component,
+ &mchp_pdmc_dai, 1);
+ if (ret) {
+ dev_err(dev, "could not register CPU DAI: %d\n", ret);
+ return ret;
+ }
+
+ /* print IP version */
+ regmap_read(dd->regmap, MCHP_PDMC_VER, &version);
+ dev_info(dd->dev, "hw version: %#lx\n",
+ version & MCHP_PDMC_VER_VERSION);
+
+ return 0;
+}
+
+static const struct of_device_id mchp_pdmc_of_match[] = {
+ {
+ .compatible = "microchip,sama7g5-pdmc",
+ }, {
+ /* sentinel */
+ }
+};
+MODULE_DEVICE_TABLE(of, mchp_pdmc_of_match);
+
+static struct platform_driver mchp_pdmc_driver = {
+ .driver = {
+ .name = "mchp-pdmc",
+ .of_match_table = of_match_ptr(mchp_pdmc_of_match),
+ .pm = &snd_soc_pm_ops,
+ },
+ .probe = mchp_pdmc_probe,
+};
+module_platform_driver(mchp_pdmc_driver);
+
+MODULE_DESCRIPTION("Microchip PDMC driver under ALSA SoC architecture");
+MODULE_AUTHOR("Codrin Ciubotariu <codrin.ciubotariu@microchip.com>");
+MODULE_LICENSE("GPL v2");
--
2.32.0
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