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 --- 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..c2c8fcb93085 --- /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/mchp,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");