diff options
Diffstat (limited to '')
| -rw-r--r-- | sound/soc/stm/Kconfig | 46 | ||||
| -rw-r--r-- | sound/soc/stm/Makefile | 18 | ||||
| -rw-r--r-- | sound/soc/stm/stm32_adfsdm.c | 384 | ||||
| -rw-r--r-- | sound/soc/stm/stm32_i2s.c | 1026 | ||||
| -rw-r--r-- | sound/soc/stm/stm32_sai.c | 305 | ||||
| -rw-r--r-- | sound/soc/stm/stm32_sai.h | 302 | ||||
| -rw-r--r-- | sound/soc/stm/stm32_sai_sub.c | 1640 | ||||
| -rw-r--r-- | sound/soc/stm/stm32_spdifrx.c | 1099 |
8 files changed, 4820 insertions, 0 deletions
diff --git a/sound/soc/stm/Kconfig b/sound/soc/stm/Kconfig new file mode 100644 index 000000000..bbade257f --- /dev/null +++ b/sound/soc/stm/Kconfig @@ -0,0 +1,46 @@ +# SPDX-License-Identifier: GPL-2.0-only +menu "STMicroelectronics STM32 SOC audio support" + +config SND_SOC_STM32_SAI + tristate "STM32 SAI interface (Serial Audio Interface) support" + depends on (ARCH_STM32 && OF) || COMPILE_TEST + depends on COMMON_CLK + depends on SND_SOC + select SND_SOC_GENERIC_DMAENGINE_PCM + select REGMAP_MMIO + select SND_PCM_IEC958 + help + Say Y if you want to enable SAI for STM32 + +config SND_SOC_STM32_I2S + tristate "STM32 I2S interface (SPI/I2S block) support" + depends on (ARCH_STM32 && OF) || COMPILE_TEST + depends on SND_SOC + select SND_SOC_GENERIC_DMAENGINE_PCM + select REGMAP_MMIO + help + Say Y if you want to enable I2S for STM32 + +config SND_SOC_STM32_SPDIFRX + tristate "STM32 S/PDIF receiver (SPDIFRX) support" + depends on (ARCH_STM32 && OF) || COMPILE_TEST + depends on SND_SOC + select SND_SOC_GENERIC_DMAENGINE_PCM + select REGMAP_MMIO + select SND_SOC_SPDIF + help + Say Y if you want to enable S/PDIF capture for STM32 + +config SND_SOC_STM32_DFSDM + tristate "SoC Audio support for STM32 DFSDM" + depends on ARCH_STM32 || COMPILE_TEST + depends on SND_SOC + depends on STM32_DFSDM_ADC + select SND_SOC_GENERIC_DMAENGINE_PCM + select SND_SOC_DMIC + select IIO_BUFFER_CB + help + Select this option to enable the STM32 Digital Filter + for Sigma Delta Modulators (DFSDM) driver used + in various STM32 series for digital microphone capture. +endmenu diff --git a/sound/soc/stm/Makefile b/sound/soc/stm/Makefile new file mode 100644 index 000000000..3143c0b47 --- /dev/null +++ b/sound/soc/stm/Makefile @@ -0,0 +1,18 @@ +# SPDX-License-Identifier: GPL-2.0 +# SAI +snd-soc-stm32-sai-sub-objs := stm32_sai_sub.o +obj-$(CONFIG_SND_SOC_STM32_SAI) += snd-soc-stm32-sai-sub.o + +snd-soc-stm32-sai-objs := stm32_sai.o +obj-$(CONFIG_SND_SOC_STM32_SAI) += snd-soc-stm32-sai.o + +# I2S +snd-soc-stm32-i2s-objs := stm32_i2s.o +obj-$(CONFIG_SND_SOC_STM32_I2S) += snd-soc-stm32-i2s.o + +# SPDIFRX +snd-soc-stm32-spdifrx-objs := stm32_spdifrx.o +obj-$(CONFIG_SND_SOC_STM32_SPDIFRX) += snd-soc-stm32-spdifrx.o + +#DFSDM +obj-$(CONFIG_SND_SOC_STM32_DFSDM) += stm32_adfsdm.o diff --git a/sound/soc/stm/stm32_adfsdm.c b/sound/soc/stm/stm32_adfsdm.c new file mode 100644 index 000000000..c4031988f --- /dev/null +++ b/sound/soc/stm/stm32_adfsdm.c @@ -0,0 +1,384 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * This file is part of STM32 DFSDM ASoC DAI driver + * + * Copyright (C) 2017, STMicroelectronics - All Rights Reserved + * Authors: Arnaud Pouliquen <arnaud.pouliquen@st.com> + * Olivier Moysan <olivier.moysan@st.com> + */ + +#include <linux/clk.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/platform_device.h> +#include <linux/slab.h> + +#include <linux/iio/iio.h> +#include <linux/iio/consumer.h> +#include <linux/iio/adc/stm32-dfsdm-adc.h> + +#include <sound/pcm.h> +#include <sound/soc.h> + +#define STM32_ADFSDM_DRV_NAME "stm32-adfsdm" + +#define DFSDM_MAX_PERIOD_SIZE (PAGE_SIZE / 2) +#define DFSDM_MAX_PERIODS 6 + +struct stm32_adfsdm_priv { + struct snd_soc_dai_driver dai_drv; + struct snd_pcm_substream *substream; + struct device *dev; + + /* IIO */ + struct iio_channel *iio_ch; + struct iio_cb_buffer *iio_cb; + bool iio_active; + + /* PCM buffer */ + unsigned char *pcm_buff; + unsigned int pos; + + struct mutex lock; /* protect against race condition on iio state */ +}; + +static const struct snd_pcm_hardware stm32_adfsdm_pcm_hw = { + .info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER | + SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_PAUSE, + .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S32_LE, + + .channels_min = 1, + .channels_max = 1, + + .periods_min = 2, + .periods_max = DFSDM_MAX_PERIODS, + + .period_bytes_max = DFSDM_MAX_PERIOD_SIZE, + .buffer_bytes_max = DFSDM_MAX_PERIODS * DFSDM_MAX_PERIOD_SIZE +}; + +static void stm32_adfsdm_shutdown(struct snd_pcm_substream *substream, + struct snd_soc_dai *dai) +{ + struct stm32_adfsdm_priv *priv = snd_soc_dai_get_drvdata(dai); + + mutex_lock(&priv->lock); + if (priv->iio_active) { + iio_channel_stop_all_cb(priv->iio_cb); + priv->iio_active = false; + } + mutex_unlock(&priv->lock); +} + +static int stm32_adfsdm_dai_prepare(struct snd_pcm_substream *substream, + struct snd_soc_dai *dai) +{ + struct stm32_adfsdm_priv *priv = snd_soc_dai_get_drvdata(dai); + int ret; + + mutex_lock(&priv->lock); + if (priv->iio_active) { + iio_channel_stop_all_cb(priv->iio_cb); + priv->iio_active = false; + } + + ret = iio_write_channel_attribute(priv->iio_ch, + substream->runtime->rate, 0, + IIO_CHAN_INFO_SAMP_FREQ); + if (ret < 0) { + dev_err(dai->dev, "%s: Failed to set %d sampling rate\n", + __func__, substream->runtime->rate); + goto out; + } + + if (!priv->iio_active) { + ret = iio_channel_start_all_cb(priv->iio_cb); + if (!ret) + priv->iio_active = true; + else + dev_err(dai->dev, "%s: IIO channel start failed (%d)\n", + __func__, ret); + } + +out: + mutex_unlock(&priv->lock); + + return ret; +} + +static int stm32_adfsdm_set_sysclk(struct snd_soc_dai *dai, int clk_id, + unsigned int freq, int dir) +{ + struct stm32_adfsdm_priv *priv = snd_soc_dai_get_drvdata(dai); + ssize_t size; + char str_freq[10]; + + dev_dbg(dai->dev, "%s: Enter for freq %d\n", __func__, freq); + + /* Set IIO frequency if CODEC is master as clock comes from SPI_IN */ + + snprintf(str_freq, sizeof(str_freq), "%d\n", freq); + size = iio_write_channel_ext_info(priv->iio_ch, "spi_clk_freq", + str_freq, sizeof(str_freq)); + if (size != sizeof(str_freq)) { + dev_err(dai->dev, "%s: Failed to set SPI clock\n", + __func__); + return -EINVAL; + } + return 0; +} + +static const struct snd_soc_dai_ops stm32_adfsdm_dai_ops = { + .shutdown = stm32_adfsdm_shutdown, + .prepare = stm32_adfsdm_dai_prepare, + .set_sysclk = stm32_adfsdm_set_sysclk, +}; + +static const struct snd_soc_dai_driver stm32_adfsdm_dai = { + .capture = { + .channels_min = 1, + .channels_max = 1, + .formats = SNDRV_PCM_FMTBIT_S16_LE | + SNDRV_PCM_FMTBIT_S32_LE, + .rates = SNDRV_PCM_RATE_CONTINUOUS, + .rate_min = 8000, + .rate_max = 48000, + }, + .ops = &stm32_adfsdm_dai_ops, +}; + +static const struct snd_soc_component_driver stm32_adfsdm_dai_component = { + .name = "stm32_dfsdm_audio", +}; + +static void stm32_memcpy_32to16(void *dest, const void *src, size_t n) +{ + unsigned int i = 0; + u16 *d = (u16 *)dest, *s = (u16 *)src; + + s++; + for (i = n >> 1; i > 0; i--) { + *d++ = *s++; + s++; + } +} + +static int stm32_afsdm_pcm_cb(const void *data, size_t size, void *private) +{ + struct stm32_adfsdm_priv *priv = private; + struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(priv->substream); + u8 *pcm_buff = priv->pcm_buff; + u8 *src_buff = (u8 *)data; + unsigned int old_pos = priv->pos; + size_t buff_size = snd_pcm_lib_buffer_bytes(priv->substream); + size_t period_size = snd_pcm_lib_period_bytes(priv->substream); + size_t cur_size, src_size = size; + snd_pcm_format_t format = priv->substream->runtime->format; + + if (format == SNDRV_PCM_FORMAT_S16_LE) + src_size >>= 1; + cur_size = src_size; + + dev_dbg(rtd->dev, "%s: buff_add :%pK, pos = %d, size = %zu\n", + __func__, &pcm_buff[priv->pos], priv->pos, src_size); + + if ((priv->pos + src_size) > buff_size) { + if (format == SNDRV_PCM_FORMAT_S16_LE) + stm32_memcpy_32to16(&pcm_buff[priv->pos], src_buff, + buff_size - priv->pos); + else + memcpy(&pcm_buff[priv->pos], src_buff, + buff_size - priv->pos); + cur_size -= buff_size - priv->pos; + priv->pos = 0; + } + + if (format == SNDRV_PCM_FORMAT_S16_LE) + stm32_memcpy_32to16(&pcm_buff[priv->pos], + &src_buff[src_size - cur_size], cur_size); + else + memcpy(&pcm_buff[priv->pos], &src_buff[src_size - cur_size], + cur_size); + + priv->pos = (priv->pos + cur_size) % buff_size; + + if (cur_size != src_size || (old_pos && (old_pos % period_size < size))) + snd_pcm_period_elapsed(priv->substream); + + return 0; +} + +static int stm32_adfsdm_trigger(struct snd_soc_component *component, + struct snd_pcm_substream *substream, int cmd) +{ + struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); + struct stm32_adfsdm_priv *priv = + snd_soc_dai_get_drvdata(asoc_rtd_to_cpu(rtd, 0)); + + switch (cmd) { + case SNDRV_PCM_TRIGGER_START: + case SNDRV_PCM_TRIGGER_RESUME: + priv->pos = 0; + return stm32_dfsdm_get_buff_cb(priv->iio_ch->indio_dev, + stm32_afsdm_pcm_cb, priv); + case SNDRV_PCM_TRIGGER_SUSPEND: + case SNDRV_PCM_TRIGGER_STOP: + return stm32_dfsdm_release_buff_cb(priv->iio_ch->indio_dev); + } + + return -EINVAL; +} + +static int stm32_adfsdm_pcm_open(struct snd_soc_component *component, + struct snd_pcm_substream *substream) +{ + struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); + struct stm32_adfsdm_priv *priv = snd_soc_dai_get_drvdata(asoc_rtd_to_cpu(rtd, 0)); + int ret; + + ret = snd_soc_set_runtime_hwparams(substream, &stm32_adfsdm_pcm_hw); + if (!ret) + priv->substream = substream; + + return ret; +} + +static int stm32_adfsdm_pcm_close(struct snd_soc_component *component, + struct snd_pcm_substream *substream) +{ + struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); + struct stm32_adfsdm_priv *priv = + snd_soc_dai_get_drvdata(asoc_rtd_to_cpu(rtd, 0)); + + priv->substream = NULL; + + return 0; +} + +static snd_pcm_uframes_t stm32_adfsdm_pcm_pointer( + struct snd_soc_component *component, + struct snd_pcm_substream *substream) +{ + struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); + struct stm32_adfsdm_priv *priv = + snd_soc_dai_get_drvdata(asoc_rtd_to_cpu(rtd, 0)); + + return bytes_to_frames(substream->runtime, priv->pos); +} + +static int stm32_adfsdm_pcm_hw_params(struct snd_soc_component *component, + struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params) +{ + struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); + struct stm32_adfsdm_priv *priv = + snd_soc_dai_get_drvdata(asoc_rtd_to_cpu(rtd, 0)); + + priv->pcm_buff = substream->runtime->dma_area; + + return iio_channel_cb_set_buffer_watermark(priv->iio_cb, + params_period_size(params)); +} + +static int stm32_adfsdm_pcm_new(struct snd_soc_component *component, + struct snd_soc_pcm_runtime *rtd) +{ + struct snd_pcm *pcm = rtd->pcm; + struct stm32_adfsdm_priv *priv = + snd_soc_dai_get_drvdata(asoc_rtd_to_cpu(rtd, 0)); + unsigned int size = DFSDM_MAX_PERIODS * DFSDM_MAX_PERIOD_SIZE; + + snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV, + priv->dev, size, size); + return 0; +} + +static struct snd_soc_component_driver stm32_adfsdm_soc_platform = { + .open = stm32_adfsdm_pcm_open, + .close = stm32_adfsdm_pcm_close, + .hw_params = stm32_adfsdm_pcm_hw_params, + .trigger = stm32_adfsdm_trigger, + .pointer = stm32_adfsdm_pcm_pointer, + .pcm_construct = stm32_adfsdm_pcm_new, +}; + +static const struct of_device_id stm32_adfsdm_of_match[] = { + {.compatible = "st,stm32h7-dfsdm-dai"}, + {} +}; +MODULE_DEVICE_TABLE(of, stm32_adfsdm_of_match); + +static int stm32_adfsdm_probe(struct platform_device *pdev) +{ + struct stm32_adfsdm_priv *priv; + struct snd_soc_component *component; + int ret; + + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->dev = &pdev->dev; + priv->dai_drv = stm32_adfsdm_dai; + mutex_init(&priv->lock); + + dev_set_drvdata(&pdev->dev, priv); + + ret = devm_snd_soc_register_component(&pdev->dev, + &stm32_adfsdm_dai_component, + &priv->dai_drv, 1); + if (ret < 0) + return ret; + + /* Associate iio channel */ + priv->iio_ch = devm_iio_channel_get_all(&pdev->dev); + if (IS_ERR(priv->iio_ch)) + return PTR_ERR(priv->iio_ch); + + priv->iio_cb = iio_channel_get_all_cb(&pdev->dev, NULL, NULL); + if (IS_ERR(priv->iio_cb)) + return PTR_ERR(priv->iio_cb); + + component = devm_kzalloc(&pdev->dev, sizeof(*component), GFP_KERNEL); + if (!component) + return -ENOMEM; + + ret = snd_soc_component_initialize(component, + &stm32_adfsdm_soc_platform, + &pdev->dev); + if (ret < 0) + return ret; +#ifdef CONFIG_DEBUG_FS + component->debugfs_prefix = "pcm"; +#endif + + ret = snd_soc_add_component(component, NULL, 0); + if (ret < 0) + dev_err(&pdev->dev, "%s: Failed to register PCM platform\n", + __func__); + + return ret; +} + +static int stm32_adfsdm_remove(struct platform_device *pdev) +{ + snd_soc_unregister_component(&pdev->dev); + + return 0; +} + +static struct platform_driver stm32_adfsdm_driver = { + .driver = { + .name = STM32_ADFSDM_DRV_NAME, + .of_match_table = stm32_adfsdm_of_match, + }, + .probe = stm32_adfsdm_probe, + .remove = stm32_adfsdm_remove, +}; + +module_platform_driver(stm32_adfsdm_driver); + +MODULE_DESCRIPTION("stm32 DFSDM DAI driver"); +MODULE_AUTHOR("Arnaud Pouliquen <arnaud.pouliquen@st.com>"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:" STM32_ADFSDM_DRV_NAME); diff --git a/sound/soc/stm/stm32_i2s.c b/sound/soc/stm/stm32_i2s.c new file mode 100644 index 000000000..7c4d63c33 --- /dev/null +++ b/sound/soc/stm/stm32_i2s.c @@ -0,0 +1,1026 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * STM32 ALSA SoC Digital Audio Interface (I2S) driver. + * + * Copyright (C) 2017, STMicroelectronics - All Rights Reserved + * Author(s): Olivier Moysan <olivier.moysan@st.com> for STMicroelectronics. + */ + +#include <linux/bitfield.h> +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/module.h> +#include <linux/of_irq.h> +#include <linux/of_platform.h> +#include <linux/regmap.h> +#include <linux/reset.h> +#include <linux/spinlock.h> + +#include <sound/dmaengine_pcm.h> +#include <sound/pcm_params.h> + +#define STM32_I2S_CR1_REG 0x0 +#define STM32_I2S_CFG1_REG 0x08 +#define STM32_I2S_CFG2_REG 0x0C +#define STM32_I2S_IER_REG 0x10 +#define STM32_I2S_SR_REG 0x14 +#define STM32_I2S_IFCR_REG 0x18 +#define STM32_I2S_TXDR_REG 0X20 +#define STM32_I2S_RXDR_REG 0x30 +#define STM32_I2S_CGFR_REG 0X50 +#define STM32_I2S_HWCFGR_REG 0x3F0 +#define STM32_I2S_VERR_REG 0x3F4 +#define STM32_I2S_IPIDR_REG 0x3F8 +#define STM32_I2S_SIDR_REG 0x3FC + +/* Bit definition for SPI2S_CR1 register */ +#define I2S_CR1_SPE BIT(0) +#define I2S_CR1_CSTART BIT(9) +#define I2S_CR1_CSUSP BIT(10) +#define I2S_CR1_HDDIR BIT(11) +#define I2S_CR1_SSI BIT(12) +#define I2S_CR1_CRC33_17 BIT(13) +#define I2S_CR1_RCRCI BIT(14) +#define I2S_CR1_TCRCI BIT(15) + +/* Bit definition for SPI_CFG2 register */ +#define I2S_CFG2_IOSWP_SHIFT 15 +#define I2S_CFG2_IOSWP BIT(I2S_CFG2_IOSWP_SHIFT) +#define I2S_CFG2_LSBFRST BIT(23) +#define I2S_CFG2_AFCNTR BIT(31) + +/* Bit definition for SPI_CFG1 register */ +#define I2S_CFG1_FTHVL_SHIFT 5 +#define I2S_CFG1_FTHVL_MASK GENMASK(8, I2S_CFG1_FTHVL_SHIFT) +#define I2S_CFG1_FTHVL_SET(x) ((x) << I2S_CFG1_FTHVL_SHIFT) + +#define I2S_CFG1_TXDMAEN BIT(15) +#define I2S_CFG1_RXDMAEN BIT(14) + +/* Bit definition for SPI2S_IER register */ +#define I2S_IER_RXPIE BIT(0) +#define I2S_IER_TXPIE BIT(1) +#define I2S_IER_DPXPIE BIT(2) +#define I2S_IER_EOTIE BIT(3) +#define I2S_IER_TXTFIE BIT(4) +#define I2S_IER_UDRIE BIT(5) +#define I2S_IER_OVRIE BIT(6) +#define I2S_IER_CRCEIE BIT(7) +#define I2S_IER_TIFREIE BIT(8) +#define I2S_IER_MODFIE BIT(9) +#define I2S_IER_TSERFIE BIT(10) + +/* Bit definition for SPI2S_SR register */ +#define I2S_SR_RXP BIT(0) +#define I2S_SR_TXP BIT(1) +#define I2S_SR_DPXP BIT(2) +#define I2S_SR_EOT BIT(3) +#define I2S_SR_TXTF BIT(4) +#define I2S_SR_UDR BIT(5) +#define I2S_SR_OVR BIT(6) +#define I2S_SR_CRCERR BIT(7) +#define I2S_SR_TIFRE BIT(8) +#define I2S_SR_MODF BIT(9) +#define I2S_SR_TSERF BIT(10) +#define I2S_SR_SUSP BIT(11) +#define I2S_SR_TXC BIT(12) +#define I2S_SR_RXPLVL GENMASK(14, 13) +#define I2S_SR_RXWNE BIT(15) + +#define I2S_SR_MASK GENMASK(15, 0) + +/* Bit definition for SPI_IFCR register */ +#define I2S_IFCR_EOTC BIT(3) +#define I2S_IFCR_TXTFC BIT(4) +#define I2S_IFCR_UDRC BIT(5) +#define I2S_IFCR_OVRC BIT(6) +#define I2S_IFCR_CRCEC BIT(7) +#define I2S_IFCR_TIFREC BIT(8) +#define I2S_IFCR_MODFC BIT(9) +#define I2S_IFCR_TSERFC BIT(10) +#define I2S_IFCR_SUSPC BIT(11) + +#define I2S_IFCR_MASK GENMASK(11, 3) + +/* Bit definition for SPI_I2SCGFR register */ +#define I2S_CGFR_I2SMOD BIT(0) + +#define I2S_CGFR_I2SCFG_SHIFT 1 +#define I2S_CGFR_I2SCFG_MASK GENMASK(3, I2S_CGFR_I2SCFG_SHIFT) +#define I2S_CGFR_I2SCFG_SET(x) ((x) << I2S_CGFR_I2SCFG_SHIFT) + +#define I2S_CGFR_I2SSTD_SHIFT 4 +#define I2S_CGFR_I2SSTD_MASK GENMASK(5, I2S_CGFR_I2SSTD_SHIFT) +#define I2S_CGFR_I2SSTD_SET(x) ((x) << I2S_CGFR_I2SSTD_SHIFT) + +#define I2S_CGFR_PCMSYNC BIT(7) + +#define I2S_CGFR_DATLEN_SHIFT 8 +#define I2S_CGFR_DATLEN_MASK GENMASK(9, I2S_CGFR_DATLEN_SHIFT) +#define I2S_CGFR_DATLEN_SET(x) ((x) << I2S_CGFR_DATLEN_SHIFT) + +#define I2S_CGFR_CHLEN_SHIFT 10 +#define I2S_CGFR_CHLEN BIT(I2S_CGFR_CHLEN_SHIFT) +#define I2S_CGFR_CKPOL BIT(11) +#define I2S_CGFR_FIXCH BIT(12) +#define I2S_CGFR_WSINV BIT(13) +#define I2S_CGFR_DATFMT BIT(14) + +#define I2S_CGFR_I2SDIV_SHIFT 16 +#define I2S_CGFR_I2SDIV_BIT_H 23 +#define I2S_CGFR_I2SDIV_MASK GENMASK(I2S_CGFR_I2SDIV_BIT_H,\ + I2S_CGFR_I2SDIV_SHIFT) +#define I2S_CGFR_I2SDIV_SET(x) ((x) << I2S_CGFR_I2SDIV_SHIFT) +#define I2S_CGFR_I2SDIV_MAX ((1 << (I2S_CGFR_I2SDIV_BIT_H -\ + I2S_CGFR_I2SDIV_SHIFT)) - 1) + +#define I2S_CGFR_ODD_SHIFT 24 +#define I2S_CGFR_ODD BIT(I2S_CGFR_ODD_SHIFT) +#define I2S_CGFR_MCKOE BIT(25) + +/* Registers below apply to I2S version 1.1 and more */ + +/* Bit definition for SPI_HWCFGR register */ +#define I2S_HWCFGR_I2S_SUPPORT_MASK GENMASK(15, 12) + +/* Bit definition for SPI_VERR register */ +#define I2S_VERR_MIN_MASK GENMASK(3, 0) +#define I2S_VERR_MAJ_MASK GENMASK(7, 4) + +/* Bit definition for SPI_IPIDR register */ +#define I2S_IPIDR_ID_MASK GENMASK(31, 0) + +/* Bit definition for SPI_SIDR register */ +#define I2S_SIDR_ID_MASK GENMASK(31, 0) + +#define I2S_IPIDR_NUMBER 0x00130022 + +enum i2s_master_mode { + I2S_MS_NOT_SET, + I2S_MS_MASTER, + I2S_MS_SLAVE, +}; + +enum i2s_mode { + I2S_I2SMOD_TX_SLAVE, + I2S_I2SMOD_RX_SLAVE, + I2S_I2SMOD_TX_MASTER, + I2S_I2SMOD_RX_MASTER, + I2S_I2SMOD_FD_SLAVE, + I2S_I2SMOD_FD_MASTER, +}; + +enum i2s_fifo_th { + I2S_FIFO_TH_NONE, + I2S_FIFO_TH_ONE_QUARTER, + I2S_FIFO_TH_HALF, + I2S_FIFO_TH_THREE_QUARTER, + I2S_FIFO_TH_FULL, +}; + +enum i2s_std { + I2S_STD_I2S, + I2S_STD_LEFT_J, + I2S_STD_RIGHT_J, + I2S_STD_DSP, +}; + +enum i2s_datlen { + I2S_I2SMOD_DATLEN_16, + I2S_I2SMOD_DATLEN_24, + I2S_I2SMOD_DATLEN_32, +}; + +#define STM32_I2S_FIFO_SIZE 16 + +#define STM32_I2S_IS_MASTER(x) ((x)->ms_flg == I2S_MS_MASTER) +#define STM32_I2S_IS_SLAVE(x) ((x)->ms_flg == I2S_MS_SLAVE) + +/** + * struct stm32_i2s_data - private data of I2S + * @regmap_conf: I2S register map configuration pointer + * @regmap: I2S register map pointer + * @pdev: device data pointer + * @dai_drv: DAI driver pointer + * @dma_data_tx: dma configuration data for tx channel + * @dma_data_rx: dma configuration data for tx channel + * @substream: PCM substream data pointer + * @i2sclk: kernel clock feeding the I2S clock generator + * @pclk: peripheral clock driving bus interface + * @x8kclk: I2S parent clock for sampling frequencies multiple of 8kHz + * @x11kclk: I2S parent clock for sampling frequencies multiple of 11kHz + * @base: mmio register base virtual address + * @phys_addr: I2S registers physical base address + * @lock_fd: lock to manage race conditions in full duplex mode + * @irq_lock: prevent race condition with IRQ + * @mclk_rate: master clock frequency (Hz) + * @fmt: DAI protocol + * @refcount: keep count of opened streams on I2S + * @ms_flg: master mode flag. + */ +struct stm32_i2s_data { + const struct regmap_config *regmap_conf; + struct regmap *regmap; + struct platform_device *pdev; + struct snd_soc_dai_driver *dai_drv; + struct snd_dmaengine_dai_dma_data dma_data_tx; + struct snd_dmaengine_dai_dma_data dma_data_rx; + struct snd_pcm_substream *substream; + struct clk *i2sclk; + struct clk *pclk; + struct clk *x8kclk; + struct clk *x11kclk; + void __iomem *base; + dma_addr_t phys_addr; + spinlock_t lock_fd; /* Manage race conditions for full duplex */ + spinlock_t irq_lock; /* used to prevent race condition with IRQ */ + unsigned int mclk_rate; + unsigned int fmt; + int refcount; + int ms_flg; +}; + +static irqreturn_t stm32_i2s_isr(int irq, void *devid) +{ + struct stm32_i2s_data *i2s = (struct stm32_i2s_data *)devid; + struct platform_device *pdev = i2s->pdev; + u32 sr, ier; + unsigned long flags; + int err = 0; + + regmap_read(i2s->regmap, STM32_I2S_SR_REG, &sr); + regmap_read(i2s->regmap, STM32_I2S_IER_REG, &ier); + + flags = sr & ier; + if (!flags) { + dev_dbg(&pdev->dev, "Spurious IRQ sr=0x%08x, ier=0x%08x\n", + sr, ier); + return IRQ_NONE; + } + + regmap_write_bits(i2s->regmap, STM32_I2S_IFCR_REG, + I2S_IFCR_MASK, flags); + + if (flags & I2S_SR_OVR) { + dev_dbg(&pdev->dev, "Overrun\n"); + err = 1; + } + + if (flags & I2S_SR_UDR) { + dev_dbg(&pdev->dev, "Underrun\n"); + err = 1; + } + + if (flags & I2S_SR_TIFRE) + dev_dbg(&pdev->dev, "Frame error\n"); + + spin_lock(&i2s->irq_lock); + if (err && i2s->substream) + snd_pcm_stop_xrun(i2s->substream); + spin_unlock(&i2s->irq_lock); + + return IRQ_HANDLED; +} + +static bool stm32_i2s_readable_reg(struct device *dev, unsigned int reg) +{ + switch (reg) { + case STM32_I2S_CR1_REG: + case STM32_I2S_CFG1_REG: + case STM32_I2S_CFG2_REG: + case STM32_I2S_IER_REG: + case STM32_I2S_SR_REG: + case STM32_I2S_RXDR_REG: + case STM32_I2S_CGFR_REG: + case STM32_I2S_HWCFGR_REG: + case STM32_I2S_VERR_REG: + case STM32_I2S_IPIDR_REG: + case STM32_I2S_SIDR_REG: + return true; + default: + return false; + } +} + +static bool stm32_i2s_volatile_reg(struct device *dev, unsigned int reg) +{ + switch (reg) { + case STM32_I2S_SR_REG: + case STM32_I2S_RXDR_REG: + return true; + default: + return false; + } +} + +static bool stm32_i2s_writeable_reg(struct device *dev, unsigned int reg) +{ + switch (reg) { + case STM32_I2S_CR1_REG: + case STM32_I2S_CFG1_REG: + case STM32_I2S_CFG2_REG: + case STM32_I2S_IER_REG: + case STM32_I2S_IFCR_REG: + case STM32_I2S_TXDR_REG: + case STM32_I2S_CGFR_REG: + return true; + default: + return false; + } +} + +static int stm32_i2s_set_dai_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt) +{ + struct stm32_i2s_data *i2s = snd_soc_dai_get_drvdata(cpu_dai); + u32 cgfr; + u32 cgfr_mask = I2S_CGFR_I2SSTD_MASK | I2S_CGFR_CKPOL | + I2S_CGFR_WSINV | I2S_CGFR_I2SCFG_MASK; + + dev_dbg(cpu_dai->dev, "fmt %x\n", fmt); + + /* + * winv = 0 : default behavior (high/low) for all standards + * ckpol = 0 for all standards. + */ + switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) { + case SND_SOC_DAIFMT_I2S: + cgfr = I2S_CGFR_I2SSTD_SET(I2S_STD_I2S); + break; + case SND_SOC_DAIFMT_MSB: + cgfr = I2S_CGFR_I2SSTD_SET(I2S_STD_LEFT_J); + break; + case SND_SOC_DAIFMT_LSB: + cgfr = I2S_CGFR_I2SSTD_SET(I2S_STD_RIGHT_J); + break; + case SND_SOC_DAIFMT_DSP_A: + cgfr = I2S_CGFR_I2SSTD_SET(I2S_STD_DSP); + break; + /* DSP_B not mapped on I2S PCM long format. 1 bit offset does not fit */ + default: + dev_err(cpu_dai->dev, "Unsupported protocol %#x\n", + fmt & SND_SOC_DAIFMT_FORMAT_MASK); + return -EINVAL; + } + + /* DAI clock strobing */ + switch (fmt & SND_SOC_DAIFMT_INV_MASK) { + case SND_SOC_DAIFMT_NB_NF: + break; + case SND_SOC_DAIFMT_IB_NF: + cgfr |= I2S_CGFR_CKPOL; + break; + case SND_SOC_DAIFMT_NB_IF: + cgfr |= I2S_CGFR_WSINV; + break; + case SND_SOC_DAIFMT_IB_IF: + cgfr |= I2S_CGFR_CKPOL; + cgfr |= I2S_CGFR_WSINV; + break; + default: + dev_err(cpu_dai->dev, "Unsupported strobing %#x\n", + fmt & SND_SOC_DAIFMT_INV_MASK); + return -EINVAL; + } + + /* DAI clock master masks */ + switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) { + case SND_SOC_DAIFMT_CBM_CFM: + i2s->ms_flg = I2S_MS_SLAVE; + break; + case SND_SOC_DAIFMT_CBS_CFS: + i2s->ms_flg = I2S_MS_MASTER; + break; + default: + dev_err(cpu_dai->dev, "Unsupported mode %#x\n", + fmt & SND_SOC_DAIFMT_MASTER_MASK); + return -EINVAL; + } + + i2s->fmt = fmt; + return regmap_update_bits(i2s->regmap, STM32_I2S_CGFR_REG, + cgfr_mask, cgfr); +} + +static int stm32_i2s_set_sysclk(struct snd_soc_dai *cpu_dai, + int clk_id, unsigned int freq, int dir) +{ + struct stm32_i2s_data *i2s = snd_soc_dai_get_drvdata(cpu_dai); + + dev_dbg(cpu_dai->dev, "I2S MCLK frequency is %uHz\n", freq); + + if ((dir == SND_SOC_CLOCK_OUT) && STM32_I2S_IS_MASTER(i2s)) { + i2s->mclk_rate = freq; + + /* Enable master clock if master mode and mclk-fs are set */ + return regmap_update_bits(i2s->regmap, STM32_I2S_CGFR_REG, + I2S_CGFR_MCKOE, I2S_CGFR_MCKOE); + } + + return 0; +} + +static int stm32_i2s_configure_clock(struct snd_soc_dai *cpu_dai, + struct snd_pcm_hw_params *params) +{ + struct stm32_i2s_data *i2s = snd_soc_dai_get_drvdata(cpu_dai); + unsigned long i2s_clock_rate; + unsigned int tmp, div, real_div, nb_bits, frame_len; + unsigned int rate = params_rate(params); + int ret; + u32 cgfr, cgfr_mask; + bool odd; + + if (!(rate % 11025)) + clk_set_parent(i2s->i2sclk, i2s->x11kclk); + else + clk_set_parent(i2s->i2sclk, i2s->x8kclk); + i2s_clock_rate = clk_get_rate(i2s->i2sclk); + + /* + * mckl = mclk_ratio x ws + * i2s mode : mclk_ratio = 256 + * dsp mode : mclk_ratio = 128 + * + * mclk on + * i2s mode : div = i2s_clk / (mclk_ratio * ws) + * dsp mode : div = i2s_clk / (mclk_ratio * ws) + * mclk off + * i2s mode : div = i2s_clk / (nb_bits x ws) + * dsp mode : div = i2s_clk / (nb_bits x ws) + */ + if (i2s->mclk_rate) { + tmp = DIV_ROUND_CLOSEST(i2s_clock_rate, i2s->mclk_rate); + } else { + frame_len = 32; + if ((i2s->fmt & SND_SOC_DAIFMT_FORMAT_MASK) == + SND_SOC_DAIFMT_DSP_A) + frame_len = 16; + + /* master clock not enabled */ + ret = regmap_read(i2s->regmap, STM32_I2S_CGFR_REG, &cgfr); + if (ret < 0) + return ret; + + nb_bits = frame_len * ((cgfr & I2S_CGFR_CHLEN) + 1); + tmp = DIV_ROUND_CLOSEST(i2s_clock_rate, (nb_bits * rate)); + } + + /* Check the parity of the divider */ + odd = tmp & 0x1; + + /* Compute the div prescaler */ + div = tmp >> 1; + + cgfr = I2S_CGFR_I2SDIV_SET(div) | (odd << I2S_CGFR_ODD_SHIFT); + cgfr_mask = I2S_CGFR_I2SDIV_MASK | I2S_CGFR_ODD; + + real_div = ((2 * div) + odd); + dev_dbg(cpu_dai->dev, "I2S clk: %ld, SCLK: %d\n", + i2s_clock_rate, rate); + dev_dbg(cpu_dai->dev, "Divider: 2*%d(div)+%d(odd) = %d\n", + div, odd, real_div); + + if (((div == 1) && odd) || (div > I2S_CGFR_I2SDIV_MAX)) { + dev_err(cpu_dai->dev, "Wrong divider setting\n"); + return -EINVAL; + } + + if (!div && !odd) + dev_warn(cpu_dai->dev, "real divider forced to 1\n"); + + ret = regmap_update_bits(i2s->regmap, STM32_I2S_CGFR_REG, + cgfr_mask, cgfr); + if (ret < 0) + return ret; + + /* Set bitclock and frameclock to their inactive state */ + return regmap_update_bits(i2s->regmap, STM32_I2S_CFG2_REG, + I2S_CFG2_AFCNTR, I2S_CFG2_AFCNTR); +} + +static int stm32_i2s_configure(struct snd_soc_dai *cpu_dai, + struct snd_pcm_hw_params *params, + struct snd_pcm_substream *substream) +{ + struct stm32_i2s_data *i2s = snd_soc_dai_get_drvdata(cpu_dai); + int format = params_width(params); + u32 cfgr, cfgr_mask, cfg1; + unsigned int fthlv; + int ret; + + switch (format) { + case 16: + cfgr = I2S_CGFR_DATLEN_SET(I2S_I2SMOD_DATLEN_16); + cfgr_mask = I2S_CGFR_DATLEN_MASK | I2S_CGFR_CHLEN; + break; + case 32: + cfgr = I2S_CGFR_DATLEN_SET(I2S_I2SMOD_DATLEN_32) | + I2S_CGFR_CHLEN; + cfgr_mask = I2S_CGFR_DATLEN_MASK | I2S_CGFR_CHLEN; + break; + default: + dev_err(cpu_dai->dev, "Unexpected format %d", format); + return -EINVAL; + } + + if (STM32_I2S_IS_SLAVE(i2s)) { + cfgr |= I2S_CGFR_I2SCFG_SET(I2S_I2SMOD_FD_SLAVE); + + /* As data length is either 16 or 32 bits, fixch always set */ + cfgr |= I2S_CGFR_FIXCH; + cfgr_mask |= I2S_CGFR_FIXCH; + } else { + cfgr |= I2S_CGFR_I2SCFG_SET(I2S_I2SMOD_FD_MASTER); + } + cfgr_mask |= I2S_CGFR_I2SCFG_MASK; + + ret = regmap_update_bits(i2s->regmap, STM32_I2S_CGFR_REG, + cfgr_mask, cfgr); + if (ret < 0) + return ret; + + fthlv = STM32_I2S_FIFO_SIZE * I2S_FIFO_TH_ONE_QUARTER / 4; + cfg1 = I2S_CFG1_FTHVL_SET(fthlv - 1); + + return regmap_update_bits(i2s->regmap, STM32_I2S_CFG1_REG, + I2S_CFG1_FTHVL_MASK, cfg1); +} + +static int stm32_i2s_startup(struct snd_pcm_substream *substream, + struct snd_soc_dai *cpu_dai) +{ + struct stm32_i2s_data *i2s = snd_soc_dai_get_drvdata(cpu_dai); + unsigned long flags; + int ret; + + spin_lock_irqsave(&i2s->irq_lock, flags); + i2s->substream = substream; + spin_unlock_irqrestore(&i2s->irq_lock, flags); + + if ((i2s->fmt & SND_SOC_DAIFMT_FORMAT_MASK) != SND_SOC_DAIFMT_DSP_A) + snd_pcm_hw_constraint_single(substream->runtime, + SNDRV_PCM_HW_PARAM_CHANNELS, 2); + + ret = clk_prepare_enable(i2s->i2sclk); + if (ret < 0) { + dev_err(cpu_dai->dev, "Failed to enable clock: %d\n", ret); + return ret; + } + + return regmap_write_bits(i2s->regmap, STM32_I2S_IFCR_REG, + I2S_IFCR_MASK, I2S_IFCR_MASK); +} + +static int stm32_i2s_hw_params(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params, + struct snd_soc_dai *cpu_dai) +{ + struct stm32_i2s_data *i2s = snd_soc_dai_get_drvdata(cpu_dai); + int ret; + + ret = stm32_i2s_configure(cpu_dai, params, substream); + if (ret < 0) { + dev_err(cpu_dai->dev, "Configuration returned error %d\n", ret); + return ret; + } + + if (STM32_I2S_IS_MASTER(i2s)) + ret = stm32_i2s_configure_clock(cpu_dai, params); + + return ret; +} + +static int stm32_i2s_trigger(struct snd_pcm_substream *substream, int cmd, + struct snd_soc_dai *cpu_dai) +{ + struct stm32_i2s_data *i2s = snd_soc_dai_get_drvdata(cpu_dai); + bool playback_flg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK); + u32 cfg1_mask, ier; + int ret; + + switch (cmd) { + case SNDRV_PCM_TRIGGER_START: + case SNDRV_PCM_TRIGGER_RESUME: + case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: + /* Enable i2s */ + dev_dbg(cpu_dai->dev, "start I2S %s\n", + playback_flg ? "playback" : "capture"); + + cfg1_mask = I2S_CFG1_RXDMAEN | I2S_CFG1_TXDMAEN; + regmap_update_bits(i2s->regmap, STM32_I2S_CFG1_REG, + cfg1_mask, cfg1_mask); + + ret = regmap_update_bits(i2s->regmap, STM32_I2S_CR1_REG, + I2S_CR1_SPE, I2S_CR1_SPE); + if (ret < 0) { + dev_err(cpu_dai->dev, "Error %d enabling I2S\n", ret); + return ret; + } + + ret = regmap_write_bits(i2s->regmap, STM32_I2S_CR1_REG, + I2S_CR1_CSTART, I2S_CR1_CSTART); + if (ret < 0) { + dev_err(cpu_dai->dev, "Error %d starting I2S\n", ret); + return ret; + } + + regmap_write_bits(i2s->regmap, STM32_I2S_IFCR_REG, + I2S_IFCR_MASK, I2S_IFCR_MASK); + + spin_lock(&i2s->lock_fd); + i2s->refcount++; + if (playback_flg) { + ier = I2S_IER_UDRIE; + } else { + ier = I2S_IER_OVRIE; + + if (STM32_I2S_IS_MASTER(i2s) && i2s->refcount == 1) + /* dummy write to gate bus clocks */ + regmap_write(i2s->regmap, + STM32_I2S_TXDR_REG, 0); + } + spin_unlock(&i2s->lock_fd); + + if (STM32_I2S_IS_SLAVE(i2s)) + ier |= I2S_IER_TIFREIE; + + regmap_update_bits(i2s->regmap, STM32_I2S_IER_REG, ier, ier); + break; + case SNDRV_PCM_TRIGGER_STOP: + case SNDRV_PCM_TRIGGER_SUSPEND: + case SNDRV_PCM_TRIGGER_PAUSE_PUSH: + dev_dbg(cpu_dai->dev, "stop I2S %s\n", + playback_flg ? "playback" : "capture"); + + if (playback_flg) + regmap_update_bits(i2s->regmap, STM32_I2S_IER_REG, + I2S_IER_UDRIE, + (unsigned int)~I2S_IER_UDRIE); + else + regmap_update_bits(i2s->regmap, STM32_I2S_IER_REG, + I2S_IER_OVRIE, + (unsigned int)~I2S_IER_OVRIE); + + spin_lock(&i2s->lock_fd); + i2s->refcount--; + if (i2s->refcount) { + spin_unlock(&i2s->lock_fd); + break; + } + + ret = regmap_update_bits(i2s->regmap, STM32_I2S_CR1_REG, + I2S_CR1_SPE, 0); + if (ret < 0) { + dev_err(cpu_dai->dev, "Error %d disabling I2S\n", ret); + spin_unlock(&i2s->lock_fd); + return ret; + } + spin_unlock(&i2s->lock_fd); + + cfg1_mask = I2S_CFG1_RXDMAEN | I2S_CFG1_TXDMAEN; + regmap_update_bits(i2s->regmap, STM32_I2S_CFG1_REG, + cfg1_mask, 0); + break; + default: + return -EINVAL; + } + + return 0; +} + +static void stm32_i2s_shutdown(struct snd_pcm_substream *substream, + struct snd_soc_dai *cpu_dai) +{ + struct stm32_i2s_data *i2s = snd_soc_dai_get_drvdata(cpu_dai); + unsigned long flags; + + regmap_update_bits(i2s->regmap, STM32_I2S_CGFR_REG, + I2S_CGFR_MCKOE, (unsigned int)~I2S_CGFR_MCKOE); + + clk_disable_unprepare(i2s->i2sclk); + + spin_lock_irqsave(&i2s->irq_lock, flags); + i2s->substream = NULL; + spin_unlock_irqrestore(&i2s->irq_lock, flags); +} + +static int stm32_i2s_dai_probe(struct snd_soc_dai *cpu_dai) +{ + struct stm32_i2s_data *i2s = dev_get_drvdata(cpu_dai->dev); + struct snd_dmaengine_dai_dma_data *dma_data_tx = &i2s->dma_data_tx; + struct snd_dmaengine_dai_dma_data *dma_data_rx = &i2s->dma_data_rx; + + /* Buswidth will be set by framework */ + dma_data_tx->addr_width = DMA_SLAVE_BUSWIDTH_UNDEFINED; + dma_data_tx->addr = (dma_addr_t)(i2s->phys_addr) + STM32_I2S_TXDR_REG; + dma_data_tx->maxburst = 1; + dma_data_rx->addr_width = DMA_SLAVE_BUSWIDTH_UNDEFINED; + dma_data_rx->addr = (dma_addr_t)(i2s->phys_addr) + STM32_I2S_RXDR_REG; + dma_data_rx->maxburst = 1; + + snd_soc_dai_init_dma_data(cpu_dai, dma_data_tx, dma_data_rx); + + return 0; +} + +static const struct regmap_config stm32_h7_i2s_regmap_conf = { + .reg_bits = 32, + .reg_stride = 4, + .val_bits = 32, + .max_register = STM32_I2S_SIDR_REG, + .readable_reg = stm32_i2s_readable_reg, + .volatile_reg = stm32_i2s_volatile_reg, + .writeable_reg = stm32_i2s_writeable_reg, + .num_reg_defaults_raw = STM32_I2S_SIDR_REG / sizeof(u32) + 1, + .fast_io = true, + .cache_type = REGCACHE_FLAT, +}; + +static const struct snd_soc_dai_ops stm32_i2s_pcm_dai_ops = { + .set_sysclk = stm32_i2s_set_sysclk, + .set_fmt = stm32_i2s_set_dai_fmt, + .startup = stm32_i2s_startup, + .hw_params = stm32_i2s_hw_params, + .trigger = stm32_i2s_trigger, + .shutdown = stm32_i2s_shutdown, +}; + +static const struct snd_pcm_hardware stm32_i2s_pcm_hw = { + .info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_MMAP, + .buffer_bytes_max = 8 * PAGE_SIZE, + .period_bytes_min = 1024, + .period_bytes_max = 4 * PAGE_SIZE, + .periods_min = 2, + .periods_max = 8, +}; + +static const struct snd_dmaengine_pcm_config stm32_i2s_pcm_config = { + .pcm_hardware = &stm32_i2s_pcm_hw, + .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config, + .prealloc_buffer_size = PAGE_SIZE * 8, +}; + +static const struct snd_soc_component_driver stm32_i2s_component = { + .name = "stm32-i2s", +}; + +static void stm32_i2s_dai_init(struct snd_soc_pcm_stream *stream, + char *stream_name) +{ + stream->stream_name = stream_name; + stream->channels_min = 1; + stream->channels_max = 2; + stream->rates = SNDRV_PCM_RATE_8000_192000; + stream->formats = SNDRV_PCM_FMTBIT_S16_LE | + SNDRV_PCM_FMTBIT_S32_LE; +} + +static int stm32_i2s_dais_init(struct platform_device *pdev, + struct stm32_i2s_data *i2s) +{ + struct snd_soc_dai_driver *dai_ptr; + + dai_ptr = devm_kzalloc(&pdev->dev, sizeof(struct snd_soc_dai_driver), + GFP_KERNEL); + if (!dai_ptr) + return -ENOMEM; + + dai_ptr->probe = stm32_i2s_dai_probe; + dai_ptr->ops = &stm32_i2s_pcm_dai_ops; + dai_ptr->id = 1; + stm32_i2s_dai_init(&dai_ptr->playback, "playback"); + stm32_i2s_dai_init(&dai_ptr->capture, "capture"); + i2s->dai_drv = dai_ptr; + + return 0; +} + +static const struct of_device_id stm32_i2s_ids[] = { + { + .compatible = "st,stm32h7-i2s", + .data = &stm32_h7_i2s_regmap_conf + }, + {}, +}; + +static int stm32_i2s_parse_dt(struct platform_device *pdev, + struct stm32_i2s_data *i2s) +{ + struct device_node *np = pdev->dev.of_node; + const struct of_device_id *of_id; + struct reset_control *rst; + struct resource *res; + int irq, ret; + + if (!np) + return -ENODEV; + + of_id = of_match_device(stm32_i2s_ids, &pdev->dev); + if (of_id) + i2s->regmap_conf = (const struct regmap_config *)of_id->data; + else + return -EINVAL; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + i2s->base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(i2s->base)) + return PTR_ERR(i2s->base); + + i2s->phys_addr = res->start; + + /* Get clocks */ + i2s->pclk = devm_clk_get(&pdev->dev, "pclk"); + if (IS_ERR(i2s->pclk)) { + if (PTR_ERR(i2s->pclk) != -EPROBE_DEFER) + dev_err(&pdev->dev, "Could not get pclk: %ld\n", + PTR_ERR(i2s->pclk)); + return PTR_ERR(i2s->pclk); + } + + i2s->i2sclk = devm_clk_get(&pdev->dev, "i2sclk"); + if (IS_ERR(i2s->i2sclk)) { + if (PTR_ERR(i2s->i2sclk) != -EPROBE_DEFER) + dev_err(&pdev->dev, "Could not get i2sclk: %ld\n", + PTR_ERR(i2s->i2sclk)); + return PTR_ERR(i2s->i2sclk); + } + + i2s->x8kclk = devm_clk_get(&pdev->dev, "x8k"); + if (IS_ERR(i2s->x8kclk)) { + if (PTR_ERR(i2s->x8kclk) != -EPROBE_DEFER) + dev_err(&pdev->dev, "Could not get x8k parent clock: %ld\n", + PTR_ERR(i2s->x8kclk)); + return PTR_ERR(i2s->x8kclk); + } + + i2s->x11kclk = devm_clk_get(&pdev->dev, "x11k"); + if (IS_ERR(i2s->x11kclk)) { + if (PTR_ERR(i2s->x11kclk) != -EPROBE_DEFER) + dev_err(&pdev->dev, "Could not get x11k parent clock: %ld\n", + PTR_ERR(i2s->x11kclk)); + return PTR_ERR(i2s->x11kclk); + } + + /* Get irqs */ + irq = platform_get_irq(pdev, 0); + if (irq < 0) + return irq; + + ret = devm_request_irq(&pdev->dev, irq, stm32_i2s_isr, IRQF_ONESHOT, + dev_name(&pdev->dev), i2s); + if (ret) { + dev_err(&pdev->dev, "irq request returned %d\n", ret); + return ret; + } + + /* Reset */ + rst = devm_reset_control_get_optional_exclusive(&pdev->dev, NULL); + if (IS_ERR(rst)) { + if (PTR_ERR(rst) != -EPROBE_DEFER) + dev_err(&pdev->dev, "Reset controller error %ld\n", + PTR_ERR(rst)); + return PTR_ERR(rst); + } + reset_control_assert(rst); + udelay(2); + reset_control_deassert(rst); + + return 0; +} + +static int stm32_i2s_remove(struct platform_device *pdev) +{ + snd_dmaengine_pcm_unregister(&pdev->dev); + snd_soc_unregister_component(&pdev->dev); + + return 0; +} + +static int stm32_i2s_probe(struct platform_device *pdev) +{ + struct stm32_i2s_data *i2s; + u32 val; + int ret; + + i2s = devm_kzalloc(&pdev->dev, sizeof(*i2s), GFP_KERNEL); + if (!i2s) + return -ENOMEM; + + ret = stm32_i2s_parse_dt(pdev, i2s); + if (ret) + return ret; + + i2s->pdev = pdev; + i2s->ms_flg = I2S_MS_NOT_SET; + spin_lock_init(&i2s->lock_fd); + spin_lock_init(&i2s->irq_lock); + platform_set_drvdata(pdev, i2s); + + ret = stm32_i2s_dais_init(pdev, i2s); + if (ret) + return ret; + + i2s->regmap = devm_regmap_init_mmio_clk(&pdev->dev, "pclk", + i2s->base, i2s->regmap_conf); + if (IS_ERR(i2s->regmap)) { + if (PTR_ERR(i2s->regmap) != -EPROBE_DEFER) + dev_err(&pdev->dev, "Regmap init error %ld\n", + PTR_ERR(i2s->regmap)); + return PTR_ERR(i2s->regmap); + } + + ret = snd_dmaengine_pcm_register(&pdev->dev, &stm32_i2s_pcm_config, 0); + if (ret) { + if (ret != -EPROBE_DEFER) + dev_err(&pdev->dev, "PCM DMA register error %d\n", ret); + return ret; + } + + ret = snd_soc_register_component(&pdev->dev, &stm32_i2s_component, + i2s->dai_drv, 1); + if (ret) { + snd_dmaengine_pcm_unregister(&pdev->dev); + return ret; + } + + /* Set SPI/I2S in i2s mode */ + ret = regmap_update_bits(i2s->regmap, STM32_I2S_CGFR_REG, + I2S_CGFR_I2SMOD, I2S_CGFR_I2SMOD); + if (ret) + goto error; + + ret = regmap_read(i2s->regmap, STM32_I2S_IPIDR_REG, &val); + if (ret) + goto error; + + if (val == I2S_IPIDR_NUMBER) { + ret = regmap_read(i2s->regmap, STM32_I2S_HWCFGR_REG, &val); + if (ret) + goto error; + + if (!FIELD_GET(I2S_HWCFGR_I2S_SUPPORT_MASK, val)) { + dev_err(&pdev->dev, + "Device does not support i2s mode\n"); + ret = -EPERM; + goto error; + } + + ret = regmap_read(i2s->regmap, STM32_I2S_VERR_REG, &val); + if (ret) + goto error; + + dev_dbg(&pdev->dev, "I2S version: %lu.%lu registered\n", + FIELD_GET(I2S_VERR_MAJ_MASK, val), + FIELD_GET(I2S_VERR_MIN_MASK, val)); + } + + return ret; + +error: + stm32_i2s_remove(pdev); + + return ret; +} + +MODULE_DEVICE_TABLE(of, stm32_i2s_ids); + +#ifdef CONFIG_PM_SLEEP +static int stm32_i2s_suspend(struct device *dev) +{ + struct stm32_i2s_data *i2s = dev_get_drvdata(dev); + + regcache_cache_only(i2s->regmap, true); + regcache_mark_dirty(i2s->regmap); + + return 0; +} + +static int stm32_i2s_resume(struct device *dev) +{ + struct stm32_i2s_data *i2s = dev_get_drvdata(dev); + + regcache_cache_only(i2s->regmap, false); + return regcache_sync(i2s->regmap); +} +#endif /* CONFIG_PM_SLEEP */ + +static const struct dev_pm_ops stm32_i2s_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(stm32_i2s_suspend, stm32_i2s_resume) +}; + +static struct platform_driver stm32_i2s_driver = { + .driver = { + .name = "st,stm32-i2s", + .of_match_table = stm32_i2s_ids, + .pm = &stm32_i2s_pm_ops, + }, + .probe = stm32_i2s_probe, + .remove = stm32_i2s_remove, +}; + +module_platform_driver(stm32_i2s_driver); + +MODULE_DESCRIPTION("STM32 Soc i2s Interface"); +MODULE_AUTHOR("Olivier Moysan, <olivier.moysan@st.com>"); +MODULE_ALIAS("platform:stm32-i2s"); +MODULE_LICENSE("GPL v2"); diff --git a/sound/soc/stm/stm32_sai.c b/sound/soc/stm/stm32_sai.c new file mode 100644 index 000000000..058757c72 --- /dev/null +++ b/sound/soc/stm/stm32_sai.c @@ -0,0 +1,305 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * STM32 ALSA SoC Digital Audio Interface (SAI) driver. + * + * Copyright (C) 2016, STMicroelectronics - All Rights Reserved + * Author(s): Olivier Moysan <olivier.moysan@st.com> for STMicroelectronics. + */ + +#include <linux/bitfield.h> +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/module.h> +#include <linux/of_platform.h> +#include <linux/pinctrl/consumer.h> +#include <linux/reset.h> + +#include <sound/dmaengine_pcm.h> +#include <sound/core.h> + +#include "stm32_sai.h" + +static const struct stm32_sai_conf stm32_sai_conf_f4 = { + .version = STM_SAI_STM32F4, + .fifo_size = 8, + .has_spdif_pdm = false, +}; + +/* + * Default settings for stm32 H7 socs and next. + * These default settings will be overridden if the soc provides + * support of hardware configuration registers. + */ +static const struct stm32_sai_conf stm32_sai_conf_h7 = { + .version = STM_SAI_STM32H7, + .fifo_size = 8, + .has_spdif_pdm = true, +}; + +static const struct of_device_id stm32_sai_ids[] = { + { .compatible = "st,stm32f4-sai", .data = (void *)&stm32_sai_conf_f4 }, + { .compatible = "st,stm32h7-sai", .data = (void *)&stm32_sai_conf_h7 }, + {} +}; + +static int stm32_sai_pclk_disable(struct device *dev) +{ + struct stm32_sai_data *sai = dev_get_drvdata(dev); + + clk_disable_unprepare(sai->pclk); + + return 0; +} + +static int stm32_sai_pclk_enable(struct device *dev) +{ + struct stm32_sai_data *sai = dev_get_drvdata(dev); + int ret; + + ret = clk_prepare_enable(sai->pclk); + if (ret) { + dev_err(&sai->pdev->dev, "failed to enable clock: %d\n", ret); + return ret; + } + + return 0; +} + +static int stm32_sai_sync_conf_client(struct stm32_sai_data *sai, int synci) +{ + int ret; + + /* Enable peripheral clock to allow GCR register access */ + ret = stm32_sai_pclk_enable(&sai->pdev->dev); + if (ret) + return ret; + + writel_relaxed(FIELD_PREP(SAI_GCR_SYNCIN_MASK, (synci - 1)), sai->base); + + stm32_sai_pclk_disable(&sai->pdev->dev); + + return 0; +} + +static int stm32_sai_sync_conf_provider(struct stm32_sai_data *sai, int synco) +{ + u32 prev_synco; + int ret; + + /* Enable peripheral clock to allow GCR register access */ + ret = stm32_sai_pclk_enable(&sai->pdev->dev); + if (ret) + return ret; + + dev_dbg(&sai->pdev->dev, "Set %pOFn%s as synchro provider\n", + sai->pdev->dev.of_node, + synco == STM_SAI_SYNC_OUT_A ? "A" : "B"); + + prev_synco = FIELD_GET(SAI_GCR_SYNCOUT_MASK, readl_relaxed(sai->base)); + if (prev_synco != STM_SAI_SYNC_OUT_NONE && synco != prev_synco) { + dev_err(&sai->pdev->dev, "%pOFn%s already set as sync provider\n", + sai->pdev->dev.of_node, + prev_synco == STM_SAI_SYNC_OUT_A ? "A" : "B"); + stm32_sai_pclk_disable(&sai->pdev->dev); + return -EINVAL; + } + + writel_relaxed(FIELD_PREP(SAI_GCR_SYNCOUT_MASK, synco), sai->base); + + stm32_sai_pclk_disable(&sai->pdev->dev); + + return 0; +} + +static int stm32_sai_set_sync(struct stm32_sai_data *sai_client, + struct device_node *np_provider, + int synco, int synci) +{ + struct platform_device *pdev = of_find_device_by_node(np_provider); + struct stm32_sai_data *sai_provider; + int ret; + + if (!pdev) { + dev_err(&sai_client->pdev->dev, + "Device not found for node %pOFn\n", np_provider); + of_node_put(np_provider); + return -ENODEV; + } + + sai_provider = platform_get_drvdata(pdev); + if (!sai_provider) { + dev_err(&sai_client->pdev->dev, + "SAI sync provider data not found\n"); + ret = -EINVAL; + goto error; + } + + /* Configure sync client */ + ret = stm32_sai_sync_conf_client(sai_client, synci); + if (ret < 0) + goto error; + + /* Configure sync provider */ + ret = stm32_sai_sync_conf_provider(sai_provider, synco); + +error: + put_device(&pdev->dev); + of_node_put(np_provider); + return ret; +} + +static int stm32_sai_probe(struct platform_device *pdev) +{ + struct stm32_sai_data *sai; + struct reset_control *rst; + const struct of_device_id *of_id; + u32 val; + int ret; + + sai = devm_kzalloc(&pdev->dev, sizeof(*sai), GFP_KERNEL); + if (!sai) + return -ENOMEM; + + sai->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(sai->base)) + return PTR_ERR(sai->base); + + of_id = of_match_device(stm32_sai_ids, &pdev->dev); + if (of_id) + memcpy(&sai->conf, (const struct stm32_sai_conf *)of_id->data, + sizeof(struct stm32_sai_conf)); + else + return -EINVAL; + + if (!STM_SAI_IS_F4(sai)) { + sai->pclk = devm_clk_get(&pdev->dev, "pclk"); + if (IS_ERR(sai->pclk)) { + if (PTR_ERR(sai->pclk) != -EPROBE_DEFER) + dev_err(&pdev->dev, "missing bus clock pclk: %ld\n", + PTR_ERR(sai->pclk)); + return PTR_ERR(sai->pclk); + } + } + + sai->clk_x8k = devm_clk_get(&pdev->dev, "x8k"); + if (IS_ERR(sai->clk_x8k)) { + if (PTR_ERR(sai->clk_x8k) != -EPROBE_DEFER) + dev_err(&pdev->dev, "missing x8k parent clock: %ld\n", + PTR_ERR(sai->clk_x8k)); + return PTR_ERR(sai->clk_x8k); + } + + sai->clk_x11k = devm_clk_get(&pdev->dev, "x11k"); + if (IS_ERR(sai->clk_x11k)) { + if (PTR_ERR(sai->clk_x11k) != -EPROBE_DEFER) + dev_err(&pdev->dev, "missing x11k parent clock: %ld\n", + PTR_ERR(sai->clk_x11k)); + return PTR_ERR(sai->clk_x11k); + } + + /* init irqs */ + sai->irq = platform_get_irq(pdev, 0); + if (sai->irq < 0) + return sai->irq; + + /* reset */ + rst = devm_reset_control_get_optional_exclusive(&pdev->dev, NULL); + if (IS_ERR(rst)) { + if (PTR_ERR(rst) != -EPROBE_DEFER) + dev_err(&pdev->dev, "Reset controller error %ld\n", + PTR_ERR(rst)); + return PTR_ERR(rst); + } + reset_control_assert(rst); + udelay(2); + reset_control_deassert(rst); + + /* Enable peripheral clock to allow register access */ + ret = clk_prepare_enable(sai->pclk); + if (ret) { + dev_err(&pdev->dev, "failed to enable clock: %d\n", ret); + return ret; + } + + val = FIELD_GET(SAI_IDR_ID_MASK, + readl_relaxed(sai->base + STM_SAI_IDR)); + if (val == SAI_IPIDR_NUMBER) { + val = readl_relaxed(sai->base + STM_SAI_HWCFGR); + sai->conf.fifo_size = FIELD_GET(SAI_HWCFGR_FIFO_SIZE, val); + sai->conf.has_spdif_pdm = !!FIELD_GET(SAI_HWCFGR_SPDIF_PDM, + val); + + val = readl_relaxed(sai->base + STM_SAI_VERR); + sai->conf.version = val; + + dev_dbg(&pdev->dev, "SAI version: %lu.%lu registered\n", + FIELD_GET(SAI_VERR_MAJ_MASK, val), + FIELD_GET(SAI_VERR_MIN_MASK, val)); + } + clk_disable_unprepare(sai->pclk); + + sai->pdev = pdev; + sai->set_sync = &stm32_sai_set_sync; + platform_set_drvdata(pdev, sai); + + return devm_of_platform_populate(&pdev->dev); +} + +#ifdef CONFIG_PM_SLEEP +/* + * When pins are shared by two sai sub instances, pins have to be defined + * in sai parent node. In this case, pins state is not managed by alsa fw. + * These pins are managed in suspend/resume callbacks. + */ +static int stm32_sai_suspend(struct device *dev) +{ + struct stm32_sai_data *sai = dev_get_drvdata(dev); + int ret; + + ret = stm32_sai_pclk_enable(dev); + if (ret) + return ret; + + sai->gcr = readl_relaxed(sai->base); + stm32_sai_pclk_disable(dev); + + return pinctrl_pm_select_sleep_state(dev); +} + +static int stm32_sai_resume(struct device *dev) +{ + struct stm32_sai_data *sai = dev_get_drvdata(dev); + int ret; + + ret = stm32_sai_pclk_enable(dev); + if (ret) + return ret; + + writel_relaxed(sai->gcr, sai->base); + stm32_sai_pclk_disable(dev); + + return pinctrl_pm_select_default_state(dev); +} +#endif /* CONFIG_PM_SLEEP */ + +static const struct dev_pm_ops stm32_sai_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(stm32_sai_suspend, stm32_sai_resume) +}; + +MODULE_DEVICE_TABLE(of, stm32_sai_ids); + +static struct platform_driver stm32_sai_driver = { + .driver = { + .name = "st,stm32-sai", + .of_match_table = stm32_sai_ids, + .pm = &stm32_sai_pm_ops, + }, + .probe = stm32_sai_probe, +}; + +module_platform_driver(stm32_sai_driver); + +MODULE_DESCRIPTION("STM32 Soc SAI Interface"); +MODULE_AUTHOR("Olivier Moysan <olivier.moysan@st.com>"); +MODULE_ALIAS("platform:st,stm32-sai"); +MODULE_LICENSE("GPL v2"); diff --git a/sound/soc/stm/stm32_sai.h b/sound/soc/stm/stm32_sai.h new file mode 100644 index 000000000..33e4bff8c --- /dev/null +++ b/sound/soc/stm/stm32_sai.h @@ -0,0 +1,302 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * STM32 ALSA SoC Digital Audio Interface (SAI) driver. + * + * Copyright (C) 2016, STMicroelectronics - All Rights Reserved + * Author(s): Olivier Moysan <olivier.moysan@st.com> for STMicroelectronics. + */ + +#include <linux/bitfield.h> + +/******************** SAI Register Map **************************************/ + +/* Global configuration register */ +#define STM_SAI_GCR 0x00 + +/* Sub-block A&B registers offsets, relative to A&B sub-block addresses */ +#define STM_SAI_CR1_REGX 0x00 /* A offset: 0x04. B offset: 0x24 */ +#define STM_SAI_CR2_REGX 0x04 +#define STM_SAI_FRCR_REGX 0x08 +#define STM_SAI_SLOTR_REGX 0x0C +#define STM_SAI_IMR_REGX 0x10 +#define STM_SAI_SR_REGX 0x14 +#define STM_SAI_CLRFR_REGX 0x18 +#define STM_SAI_DR_REGX 0x1C + +/* Sub-block A registers, relative to sub-block A address */ +#define STM_SAI_PDMCR_REGX 0x40 +#define STM_SAI_PDMLY_REGX 0x44 + +/* Hardware configuration registers */ +#define STM_SAI_HWCFGR 0x3F0 +#define STM_SAI_VERR 0x3F4 +#define STM_SAI_IDR 0x3F8 +#define STM_SAI_SIDR 0x3FC + +/******************** Bit definition for SAI_GCR register *******************/ +#define SAI_GCR_SYNCIN_SHIFT 0 +#define SAI_GCR_SYNCIN_WDTH 2 +#define SAI_GCR_SYNCIN_MASK GENMASK(1, SAI_GCR_SYNCIN_SHIFT) +#define SAI_GCR_SYNCIN_MAX FIELD_GET(SAI_GCR_SYNCIN_MASK,\ + SAI_GCR_SYNCIN_MASK) + +#define SAI_GCR_SYNCOUT_SHIFT 4 +#define SAI_GCR_SYNCOUT_MASK GENMASK(5, SAI_GCR_SYNCOUT_SHIFT) + +/******************* Bit definition for SAI_XCR1 register *******************/ +#define SAI_XCR1_RX_TX_SHIFT 0 +#define SAI_XCR1_RX_TX BIT(SAI_XCR1_RX_TX_SHIFT) +#define SAI_XCR1_SLAVE_SHIFT 1 +#define SAI_XCR1_SLAVE BIT(SAI_XCR1_SLAVE_SHIFT) + +#define SAI_XCR1_PRTCFG_SHIFT 2 +#define SAI_XCR1_PRTCFG_MASK GENMASK(3, SAI_XCR1_PRTCFG_SHIFT) +#define SAI_XCR1_PRTCFG_SET(x) ((x) << SAI_XCR1_PRTCFG_SHIFT) + +#define SAI_XCR1_DS_SHIFT 5 +#define SAI_XCR1_DS_MASK GENMASK(7, SAI_XCR1_DS_SHIFT) +#define SAI_XCR1_DS_SET(x) ((x) << SAI_XCR1_DS_SHIFT) + +#define SAI_XCR1_LSBFIRST_SHIFT 8 +#define SAI_XCR1_LSBFIRST BIT(SAI_XCR1_LSBFIRST_SHIFT) +#define SAI_XCR1_CKSTR_SHIFT 9 +#define SAI_XCR1_CKSTR BIT(SAI_XCR1_CKSTR_SHIFT) + +#define SAI_XCR1_SYNCEN_SHIFT 10 +#define SAI_XCR1_SYNCEN_MASK GENMASK(11, SAI_XCR1_SYNCEN_SHIFT) +#define SAI_XCR1_SYNCEN_SET(x) ((x) << SAI_XCR1_SYNCEN_SHIFT) + +#define SAI_XCR1_MONO_SHIFT 12 +#define SAI_XCR1_MONO BIT(SAI_XCR1_MONO_SHIFT) +#define SAI_XCR1_OUTDRIV_SHIFT 13 +#define SAI_XCR1_OUTDRIV BIT(SAI_XCR1_OUTDRIV_SHIFT) +#define SAI_XCR1_SAIEN_SHIFT 16 +#define SAI_XCR1_SAIEN BIT(SAI_XCR1_SAIEN_SHIFT) +#define SAI_XCR1_DMAEN_SHIFT 17 +#define SAI_XCR1_DMAEN BIT(SAI_XCR1_DMAEN_SHIFT) +#define SAI_XCR1_NODIV_SHIFT 19 +#define SAI_XCR1_NODIV BIT(SAI_XCR1_NODIV_SHIFT) + +#define SAI_XCR1_MCKDIV_SHIFT 20 +#define SAI_XCR1_MCKDIV_WIDTH(x) (((x) == STM_SAI_STM32F4) ? 4 : 6) +#define SAI_XCR1_MCKDIV_MASK(x) GENMASK((SAI_XCR1_MCKDIV_SHIFT + (x) - 1),\ + SAI_XCR1_MCKDIV_SHIFT) +#define SAI_XCR1_MCKDIV_SET(x) ((x) << SAI_XCR1_MCKDIV_SHIFT) +#define SAI_XCR1_MCKDIV_MAX(x) ((1 << SAI_XCR1_MCKDIV_WIDTH(x)) - 1) + +#define SAI_XCR1_OSR_SHIFT 26 +#define SAI_XCR1_OSR BIT(SAI_XCR1_OSR_SHIFT) + +#define SAI_XCR1_MCKEN_SHIFT 27 +#define SAI_XCR1_MCKEN BIT(SAI_XCR1_MCKEN_SHIFT) + +/******************* Bit definition for SAI_XCR2 register *******************/ +#define SAI_XCR2_FTH_SHIFT 0 +#define SAI_XCR2_FTH_MASK GENMASK(2, SAI_XCR2_FTH_SHIFT) +#define SAI_XCR2_FTH_SET(x) ((x) << SAI_XCR2_FTH_SHIFT) + +#define SAI_XCR2_FFLUSH_SHIFT 3 +#define SAI_XCR2_FFLUSH BIT(SAI_XCR2_FFLUSH_SHIFT) +#define SAI_XCR2_TRIS_SHIFT 4 +#define SAI_XCR2_TRIS BIT(SAI_XCR2_TRIS_SHIFT) +#define SAI_XCR2_MUTE_SHIFT 5 +#define SAI_XCR2_MUTE BIT(SAI_XCR2_MUTE_SHIFT) +#define SAI_XCR2_MUTEVAL_SHIFT 6 +#define SAI_XCR2_MUTEVAL BIT(SAI_XCR2_MUTEVAL_SHIFT) + +#define SAI_XCR2_MUTECNT_SHIFT 7 +#define SAI_XCR2_MUTECNT_MASK GENMASK(12, SAI_XCR2_MUTECNT_SHIFT) +#define SAI_XCR2_MUTECNT_SET(x) ((x) << SAI_XCR2_MUTECNT_SHIFT) + +#define SAI_XCR2_CPL_SHIFT 13 +#define SAI_XCR2_CPL BIT(SAI_XCR2_CPL_SHIFT) + +#define SAI_XCR2_COMP_SHIFT 14 +#define SAI_XCR2_COMP_MASK GENMASK(15, SAI_XCR2_COMP_SHIFT) +#define SAI_XCR2_COMP_SET(x) ((x) << SAI_XCR2_COMP_SHIFT) + +/****************** Bit definition for SAI_XFRCR register *******************/ +#define SAI_XFRCR_FRL_SHIFT 0 +#define SAI_XFRCR_FRL_MASK GENMASK(7, SAI_XFRCR_FRL_SHIFT) +#define SAI_XFRCR_FRL_SET(x) ((x) << SAI_XFRCR_FRL_SHIFT) + +#define SAI_XFRCR_FSALL_SHIFT 8 +#define SAI_XFRCR_FSALL_MASK GENMASK(14, SAI_XFRCR_FSALL_SHIFT) +#define SAI_XFRCR_FSALL_SET(x) ((x) << SAI_XFRCR_FSALL_SHIFT) + +#define SAI_XFRCR_FSDEF_SHIFT 16 +#define SAI_XFRCR_FSDEF BIT(SAI_XFRCR_FSDEF_SHIFT) +#define SAI_XFRCR_FSPOL_SHIFT 17 +#define SAI_XFRCR_FSPOL BIT(SAI_XFRCR_FSPOL_SHIFT) +#define SAI_XFRCR_FSOFF_SHIFT 18 +#define SAI_XFRCR_FSOFF BIT(SAI_XFRCR_FSOFF_SHIFT) + +/****************** Bit definition for SAI_XSLOTR register ******************/ +#define SAI_XSLOTR_FBOFF_SHIFT 0 +#define SAI_XSLOTR_FBOFF_MASK GENMASK(4, SAI_XSLOTR_FBOFF_SHIFT) +#define SAI_XSLOTR_FBOFF_SET(x) ((x) << SAI_XSLOTR_FBOFF_SHIFT) + +#define SAI_XSLOTR_SLOTSZ_SHIFT 6 +#define SAI_XSLOTR_SLOTSZ_MASK GENMASK(7, SAI_XSLOTR_SLOTSZ_SHIFT) +#define SAI_XSLOTR_SLOTSZ_SET(x) ((x) << SAI_XSLOTR_SLOTSZ_SHIFT) + +#define SAI_XSLOTR_NBSLOT_SHIFT 8 +#define SAI_XSLOTR_NBSLOT_MASK GENMASK(11, SAI_XSLOTR_NBSLOT_SHIFT) +#define SAI_XSLOTR_NBSLOT_SET(x) ((x) << SAI_XSLOTR_NBSLOT_SHIFT) + +#define SAI_XSLOTR_SLOTEN_SHIFT 16 +#define SAI_XSLOTR_SLOTEN_WIDTH 16 +#define SAI_XSLOTR_SLOTEN_MASK GENMASK(31, SAI_XSLOTR_SLOTEN_SHIFT) +#define SAI_XSLOTR_SLOTEN_SET(x) ((x) << SAI_XSLOTR_SLOTEN_SHIFT) + +/******************* Bit definition for SAI_XIMR register *******************/ +#define SAI_XIMR_OVRUDRIE BIT(0) +#define SAI_XIMR_MUTEDETIE BIT(1) +#define SAI_XIMR_WCKCFGIE BIT(2) +#define SAI_XIMR_FREQIE BIT(3) +#define SAI_XIMR_CNRDYIE BIT(4) +#define SAI_XIMR_AFSDETIE BIT(5) +#define SAI_XIMR_LFSDETIE BIT(6) + +#define SAI_XIMR_SHIFT 0 +#define SAI_XIMR_MASK GENMASK(6, SAI_XIMR_SHIFT) + +/******************** Bit definition for SAI_XSR register *******************/ +#define SAI_XSR_OVRUDR BIT(0) +#define SAI_XSR_MUTEDET BIT(1) +#define SAI_XSR_WCKCFG BIT(2) +#define SAI_XSR_FREQ BIT(3) +#define SAI_XSR_CNRDY BIT(4) +#define SAI_XSR_AFSDET BIT(5) +#define SAI_XSR_LFSDET BIT(6) + +#define SAI_XSR_SHIFT 0 +#define SAI_XSR_MASK GENMASK(6, SAI_XSR_SHIFT) + +/****************** Bit definition for SAI_XCLRFR register ******************/ +#define SAI_XCLRFR_COVRUDR BIT(0) +#define SAI_XCLRFR_CMUTEDET BIT(1) +#define SAI_XCLRFR_CWCKCFG BIT(2) +#define SAI_XCLRFR_CFREQ BIT(3) +#define SAI_XCLRFR_CCNRDY BIT(4) +#define SAI_XCLRFR_CAFSDET BIT(5) +#define SAI_XCLRFR_CLFSDET BIT(6) + +#define SAI_XCLRFR_SHIFT 0 +#define SAI_XCLRFR_MASK GENMASK(6, SAI_XCLRFR_SHIFT) + +/****************** Bit definition for SAI_PDMCR register ******************/ +#define SAI_PDMCR_PDMEN BIT(0) + +#define SAI_PDMCR_MICNBR_SHIFT 4 +#define SAI_PDMCR_MICNBR_MASK GENMASK(5, SAI_PDMCR_MICNBR_SHIFT) +#define SAI_PDMCR_MICNBR_SET(x) ((x) << SAI_PDMCR_MICNBR_SHIFT) + +#define SAI_PDMCR_CKEN1 BIT(8) +#define SAI_PDMCR_CKEN2 BIT(9) +#define SAI_PDMCR_CKEN3 BIT(10) +#define SAI_PDMCR_CKEN4 BIT(11) + +/****************** Bit definition for (SAI_PDMDLY register ****************/ +#define SAI_PDMDLY_1L_SHIFT 0 +#define SAI_PDMDLY_1L_MASK GENMASK(2, SAI_PDMDLY_1L_SHIFT) +#define SAI_PDMDLY_1L_WIDTH 3 + +#define SAI_PDMDLY_1R_SHIFT 4 +#define SAI_PDMDLY_1R_MASK GENMASK(6, SAI_PDMDLY_1R_SHIFT) +#define SAI_PDMDLY_1R_WIDTH 3 + +#define SAI_PDMDLY_2L_SHIFT 8 +#define SAI_PDMDLY_2L_MASK GENMASK(10, SAI_PDMDLY_2L_SHIFT) +#define SAI_PDMDLY_2L_WIDTH 3 + +#define SAI_PDMDLY_2R_SHIFT 12 +#define SAI_PDMDLY_2R_MASK GENMASK(14, SAI_PDMDLY_2R_SHIFT) +#define SAI_PDMDLY_2R_WIDTH 3 + +#define SAI_PDMDLY_3L_SHIFT 16 +#define SAI_PDMDLY_3L_MASK GENMASK(18, SAI_PDMDLY_3L_SHIFT) +#define SAI_PDMDLY_3L_WIDTH 3 + +#define SAI_PDMDLY_3R_SHIFT 20 +#define SAI_PDMDLY_3R_MASK GENMASK(22, SAI_PDMDLY_3R_SHIFT) +#define SAI_PDMDLY_3R_WIDTH 3 + +#define SAI_PDMDLY_4L_SHIFT 24 +#define SAI_PDMDLY_4L_MASK GENMASK(26, SAI_PDMDLY_4L_SHIFT) +#define SAI_PDMDLY_4L_WIDTH 3 + +#define SAI_PDMDLY_4R_SHIFT 28 +#define SAI_PDMDLY_4R_MASK GENMASK(30, SAI_PDMDLY_4R_SHIFT) +#define SAI_PDMDLY_4R_WIDTH 3 + +/* Registers below apply to SAI version 2.1 and more */ + +/* Bit definition for SAI_HWCFGR register */ +#define SAI_HWCFGR_FIFO_SIZE GENMASK(7, 0) +#define SAI_HWCFGR_SPDIF_PDM GENMASK(11, 8) +#define SAI_HWCFGR_REGOUT GENMASK(19, 12) + +/* Bit definition for SAI_VERR register */ +#define SAI_VERR_MIN_MASK GENMASK(3, 0) +#define SAI_VERR_MAJ_MASK GENMASK(7, 4) + +/* Bit definition for SAI_IDR register */ +#define SAI_IDR_ID_MASK GENMASK(31, 0) + +/* Bit definition for SAI_SIDR register */ +#define SAI_SIDR_ID_MASK GENMASK(31, 0) + +#define SAI_IPIDR_NUMBER 0x00130031 + +/* SAI version numbers are 1.x for F4. Major version number set to 1 for F4 */ +#define STM_SAI_STM32F4 BIT(4) +/* Dummy version number for H7 socs and next */ +#define STM_SAI_STM32H7 0x0 + +#define STM_SAI_IS_F4(ip) ((ip)->conf.version == STM_SAI_STM32F4) +#define STM_SAI_HAS_SPDIF_PDM(ip)\ + ((ip)->pdata->conf.has_spdif_pdm) + +enum stm32_sai_syncout { + STM_SAI_SYNC_OUT_NONE, + STM_SAI_SYNC_OUT_A, + STM_SAI_SYNC_OUT_B, +}; + +/** + * struct stm32_sai_conf - SAI configuration + * @version: SAI version + * @fifo_size: SAI fifo size as words number + * @has_spdif_pdm: SAI S/PDIF and PDM features support flag + */ +struct stm32_sai_conf { + u32 version; + u32 fifo_size; + bool has_spdif_pdm; +}; + +/** + * struct stm32_sai_data - private data of SAI instance driver + * @pdev: device data pointer + * @base: common register bank virtual base address + * @pclk: SAI bus clock + * @clk_x8k: SAI parent clock for sampling frequencies multiple of 8kHz + * @clk_x11k: SAI parent clock for sampling frequencies multiple of 11kHz + * @conf: SAI hardware capabitilites + * @irq: SAI interrupt line + * @set_sync: pointer to synchro mode configuration callback + * @gcr: SAI Global Configuration Register + */ +struct stm32_sai_data { + struct platform_device *pdev; + void __iomem *base; + struct clk *pclk; + struct clk *clk_x8k; + struct clk *clk_x11k; + struct stm32_sai_conf conf; + int irq; + int (*set_sync)(struct stm32_sai_data *sai, + struct device_node *np_provider, int synco, int synci); + u32 gcr; +}; diff --git a/sound/soc/stm/stm32_sai_sub.c b/sound/soc/stm/stm32_sai_sub.c new file mode 100644 index 000000000..3aa1cf262 --- /dev/null +++ b/sound/soc/stm/stm32_sai_sub.c @@ -0,0 +1,1640 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * STM32 ALSA SoC Digital Audio Interface (SAI) driver. + * + * Copyright (C) 2016, STMicroelectronics - All Rights Reserved + * Author(s): Olivier Moysan <olivier.moysan@st.com> for STMicroelectronics. + */ + +#include <linux/clk.h> +#include <linux/clk-provider.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of_irq.h> +#include <linux/of_platform.h> +#include <linux/pm_runtime.h> +#include <linux/regmap.h> + +#include <sound/asoundef.h> +#include <sound/core.h> +#include <sound/dmaengine_pcm.h> +#include <sound/pcm_params.h> + +#include "stm32_sai.h" + +#define SAI_FREE_PROTOCOL 0x0 +#define SAI_SPDIF_PROTOCOL 0x1 + +#define SAI_SLOT_SIZE_AUTO 0x0 +#define SAI_SLOT_SIZE_16 0x1 +#define SAI_SLOT_SIZE_32 0x2 + +#define SAI_DATASIZE_8 0x2 +#define SAI_DATASIZE_10 0x3 +#define SAI_DATASIZE_16 0x4 +#define SAI_DATASIZE_20 0x5 +#define SAI_DATASIZE_24 0x6 +#define SAI_DATASIZE_32 0x7 + +#define STM_SAI_DAI_NAME_SIZE 15 + +#define STM_SAI_IS_PLAYBACK(ip) ((ip)->dir == SNDRV_PCM_STREAM_PLAYBACK) +#define STM_SAI_IS_CAPTURE(ip) ((ip)->dir == SNDRV_PCM_STREAM_CAPTURE) + +#define STM_SAI_A_ID 0x0 +#define STM_SAI_B_ID 0x1 + +#define STM_SAI_IS_SUB_A(x) ((x)->id == STM_SAI_A_ID) +#define STM_SAI_IS_SUB_B(x) ((x)->id == STM_SAI_B_ID) +#define STM_SAI_BLOCK_NAME(x) (((x)->id == STM_SAI_A_ID) ? "A" : "B") + +#define SAI_SYNC_NONE 0x0 +#define SAI_SYNC_INTERNAL 0x1 +#define SAI_SYNC_EXTERNAL 0x2 + +#define STM_SAI_PROTOCOL_IS_SPDIF(ip) ((ip)->spdif) +#define STM_SAI_HAS_SPDIF(x) ((x)->pdata->conf.has_spdif_pdm) +#define STM_SAI_HAS_PDM(x) ((x)->pdata->conf.has_spdif_pdm) +#define STM_SAI_HAS_EXT_SYNC(x) (!STM_SAI_IS_F4(sai->pdata)) + +#define SAI_IEC60958_BLOCK_FRAMES 192 +#define SAI_IEC60958_STATUS_BYTES 24 + +#define SAI_MCLK_NAME_LEN 32 +#define SAI_RATE_11K 11025 + +/** + * struct stm32_sai_sub_data - private data of SAI sub block (block A or B) + * @pdev: device data pointer + * @regmap: SAI register map pointer + * @regmap_config: SAI sub block register map configuration pointer + * @dma_params: dma configuration data for rx or tx channel + * @cpu_dai_drv: DAI driver data pointer + * @cpu_dai: DAI runtime data pointer + * @substream: PCM substream data pointer + * @pdata: SAI block parent data pointer + * @np_sync_provider: synchronization provider node + * @sai_ck: kernel clock feeding the SAI clock generator + * @sai_mclk: master clock from SAI mclk provider + * @phys_addr: SAI registers physical base address + * @mclk_rate: SAI block master clock frequency (Hz). set at init + * @id: SAI sub block id corresponding to sub-block A or B + * @dir: SAI block direction (playback or capture). set at init + * @master: SAI block mode flag. (true=master, false=slave) set at init + * @spdif: SAI S/PDIF iec60958 mode flag. set at init + * @fmt: SAI block format. relevant only for custom protocols. set at init + * @sync: SAI block synchronization mode. (none, internal or external) + * @synco: SAI block ext sync source (provider setting). (none, sub-block A/B) + * @synci: SAI block ext sync source (client setting). (SAI sync provider index) + * @fs_length: frame synchronization length. depends on protocol settings + * @slots: rx or tx slot number + * @slot_width: rx or tx slot width in bits + * @slot_mask: rx or tx active slots mask. set at init or at runtime + * @data_size: PCM data width. corresponds to PCM substream width. + * @spdif_frm_cnt: S/PDIF playback frame counter + * @iec958: iec958 data + * @ctrl_lock: control lock + * @irq_lock: prevent race condition with IRQ + */ +struct stm32_sai_sub_data { + struct platform_device *pdev; + struct regmap *regmap; + const struct regmap_config *regmap_config; + struct snd_dmaengine_dai_dma_data dma_params; + struct snd_soc_dai_driver cpu_dai_drv; + struct snd_soc_dai *cpu_dai; + struct snd_pcm_substream *substream; + struct stm32_sai_data *pdata; + struct device_node *np_sync_provider; + struct clk *sai_ck; + struct clk *sai_mclk; + dma_addr_t phys_addr; + unsigned int mclk_rate; + unsigned int id; + int dir; + bool master; + bool spdif; + int fmt; + int sync; + int synco; + int synci; + int fs_length; + int slots; + int slot_width; + int slot_mask; + int data_size; + unsigned int spdif_frm_cnt; + struct snd_aes_iec958 iec958; + struct mutex ctrl_lock; /* protect resources accessed by controls */ + spinlock_t irq_lock; /* used to prevent race condition with IRQ */ +}; + +enum stm32_sai_fifo_th { + STM_SAI_FIFO_TH_EMPTY, + STM_SAI_FIFO_TH_QUARTER, + STM_SAI_FIFO_TH_HALF, + STM_SAI_FIFO_TH_3_QUARTER, + STM_SAI_FIFO_TH_FULL, +}; + +static bool stm32_sai_sub_readable_reg(struct device *dev, unsigned int reg) +{ + switch (reg) { + case STM_SAI_CR1_REGX: + case STM_SAI_CR2_REGX: + case STM_SAI_FRCR_REGX: + case STM_SAI_SLOTR_REGX: + case STM_SAI_IMR_REGX: + case STM_SAI_SR_REGX: + case STM_SAI_CLRFR_REGX: + case STM_SAI_DR_REGX: + case STM_SAI_PDMCR_REGX: + case STM_SAI_PDMLY_REGX: + return true; + default: + return false; + } +} + +static bool stm32_sai_sub_volatile_reg(struct device *dev, unsigned int reg) +{ + switch (reg) { + case STM_SAI_DR_REGX: + case STM_SAI_SR_REGX: + return true; + default: + return false; + } +} + +static bool stm32_sai_sub_writeable_reg(struct device *dev, unsigned int reg) +{ + switch (reg) { + case STM_SAI_CR1_REGX: + case STM_SAI_CR2_REGX: + case STM_SAI_FRCR_REGX: + case STM_SAI_SLOTR_REGX: + case STM_SAI_IMR_REGX: + case STM_SAI_CLRFR_REGX: + case STM_SAI_DR_REGX: + case STM_SAI_PDMCR_REGX: + case STM_SAI_PDMLY_REGX: + return true; + default: + return false; + } +} + +static int stm32_sai_sub_reg_up(struct stm32_sai_sub_data *sai, + unsigned int reg, unsigned int mask, + unsigned int val) +{ + int ret; + + ret = clk_enable(sai->pdata->pclk); + if (ret < 0) + return ret; + + ret = regmap_update_bits(sai->regmap, reg, mask, val); + + clk_disable(sai->pdata->pclk); + + return ret; +} + +static int stm32_sai_sub_reg_wr(struct stm32_sai_sub_data *sai, + unsigned int reg, unsigned int mask, + unsigned int val) +{ + int ret; + + ret = clk_enable(sai->pdata->pclk); + if (ret < 0) + return ret; + + ret = regmap_write_bits(sai->regmap, reg, mask, val); + + clk_disable(sai->pdata->pclk); + + return ret; +} + +static int stm32_sai_sub_reg_rd(struct stm32_sai_sub_data *sai, + unsigned int reg, unsigned int *val) +{ + int ret; + + ret = clk_enable(sai->pdata->pclk); + if (ret < 0) + return ret; + + ret = regmap_read(sai->regmap, reg, val); + + clk_disable(sai->pdata->pclk); + + return ret; +} + +static const struct regmap_config stm32_sai_sub_regmap_config_f4 = { + .reg_bits = 32, + .reg_stride = 4, + .val_bits = 32, + .max_register = STM_SAI_DR_REGX, + .readable_reg = stm32_sai_sub_readable_reg, + .volatile_reg = stm32_sai_sub_volatile_reg, + .writeable_reg = stm32_sai_sub_writeable_reg, + .fast_io = true, + .cache_type = REGCACHE_FLAT, +}; + +static const struct regmap_config stm32_sai_sub_regmap_config_h7 = { + .reg_bits = 32, + .reg_stride = 4, + .val_bits = 32, + .max_register = STM_SAI_PDMLY_REGX, + .readable_reg = stm32_sai_sub_readable_reg, + .volatile_reg = stm32_sai_sub_volatile_reg, + .writeable_reg = stm32_sai_sub_writeable_reg, + .fast_io = true, + .cache_type = REGCACHE_FLAT, +}; + +static int snd_pcm_iec958_info(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_info *uinfo) +{ + uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958; + uinfo->count = 1; + + return 0; +} + +static int snd_pcm_iec958_get(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_value *uctl) +{ + struct stm32_sai_sub_data *sai = snd_kcontrol_chip(kcontrol); + + mutex_lock(&sai->ctrl_lock); + memcpy(uctl->value.iec958.status, sai->iec958.status, 4); + mutex_unlock(&sai->ctrl_lock); + + return 0; +} + +static int snd_pcm_iec958_put(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_value *uctl) +{ + struct stm32_sai_sub_data *sai = snd_kcontrol_chip(kcontrol); + + mutex_lock(&sai->ctrl_lock); + memcpy(sai->iec958.status, uctl->value.iec958.status, 4); + mutex_unlock(&sai->ctrl_lock); + + return 0; +} + +static const struct snd_kcontrol_new iec958_ctls = { + .access = (SNDRV_CTL_ELEM_ACCESS_READWRITE | + SNDRV_CTL_ELEM_ACCESS_VOLATILE), + .iface = SNDRV_CTL_ELEM_IFACE_PCM, + .name = SNDRV_CTL_NAME_IEC958("", PLAYBACK, DEFAULT), + .info = snd_pcm_iec958_info, + .get = snd_pcm_iec958_get, + .put = snd_pcm_iec958_put, +}; + +struct stm32_sai_mclk_data { + struct clk_hw hw; + unsigned long freq; + struct stm32_sai_sub_data *sai_data; +}; + +#define to_mclk_data(_hw) container_of(_hw, struct stm32_sai_mclk_data, hw) +#define STM32_SAI_MAX_CLKS 1 + +static int stm32_sai_get_clk_div(struct stm32_sai_sub_data *sai, + unsigned long input_rate, + unsigned long output_rate) +{ + int version = sai->pdata->conf.version; + int div; + + div = DIV_ROUND_CLOSEST(input_rate, output_rate); + if (div > SAI_XCR1_MCKDIV_MAX(version)) { + dev_err(&sai->pdev->dev, "Divider %d out of range\n", div); + return -EINVAL; + } + dev_dbg(&sai->pdev->dev, "SAI divider %d\n", div); + + if (input_rate % div) + dev_dbg(&sai->pdev->dev, + "Rate not accurate. requested (%ld), actual (%ld)\n", + output_rate, input_rate / div); + + return div; +} + +static int stm32_sai_set_clk_div(struct stm32_sai_sub_data *sai, + unsigned int div) +{ + int version = sai->pdata->conf.version; + int ret, cr1, mask; + + if (div > SAI_XCR1_MCKDIV_MAX(version)) { + dev_err(&sai->pdev->dev, "Divider %d out of range\n", div); + return -EINVAL; + } + + mask = SAI_XCR1_MCKDIV_MASK(SAI_XCR1_MCKDIV_WIDTH(version)); + cr1 = SAI_XCR1_MCKDIV_SET(div); + ret = stm32_sai_sub_reg_up(sai, STM_SAI_CR1_REGX, mask, cr1); + if (ret < 0) + dev_err(&sai->pdev->dev, "Failed to update CR1 register\n"); + + return ret; +} + +static int stm32_sai_set_parent_clock(struct stm32_sai_sub_data *sai, + unsigned int rate) +{ + struct platform_device *pdev = sai->pdev; + struct clk *parent_clk = sai->pdata->clk_x8k; + int ret; + + if (!(rate % SAI_RATE_11K)) + parent_clk = sai->pdata->clk_x11k; + + ret = clk_set_parent(sai->sai_ck, parent_clk); + if (ret) + dev_err(&pdev->dev, " Error %d setting sai_ck parent clock. %s", + ret, ret == -EBUSY ? + "Active stream rates conflict\n" : "\n"); + + return ret; +} + +static long stm32_sai_mclk_round_rate(struct clk_hw *hw, unsigned long rate, + unsigned long *prate) +{ + struct stm32_sai_mclk_data *mclk = to_mclk_data(hw); + struct stm32_sai_sub_data *sai = mclk->sai_data; + int div; + + div = stm32_sai_get_clk_div(sai, *prate, rate); + if (div < 0) + return div; + + mclk->freq = *prate / div; + + return mclk->freq; +} + +static unsigned long stm32_sai_mclk_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + struct stm32_sai_mclk_data *mclk = to_mclk_data(hw); + + return mclk->freq; +} + +static int stm32_sai_mclk_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long parent_rate) +{ + struct stm32_sai_mclk_data *mclk = to_mclk_data(hw); + struct stm32_sai_sub_data *sai = mclk->sai_data; + int div, ret; + + div = stm32_sai_get_clk_div(sai, parent_rate, rate); + if (div < 0) + return div; + + ret = stm32_sai_set_clk_div(sai, div); + if (ret) + return ret; + + mclk->freq = rate; + + return 0; +} + +static int stm32_sai_mclk_enable(struct clk_hw *hw) +{ + struct stm32_sai_mclk_data *mclk = to_mclk_data(hw); + struct stm32_sai_sub_data *sai = mclk->sai_data; + + dev_dbg(&sai->pdev->dev, "Enable master clock\n"); + + return stm32_sai_sub_reg_up(sai, STM_SAI_CR1_REGX, + SAI_XCR1_MCKEN, SAI_XCR1_MCKEN); +} + +static void stm32_sai_mclk_disable(struct clk_hw *hw) +{ + struct stm32_sai_mclk_data *mclk = to_mclk_data(hw); + struct stm32_sai_sub_data *sai = mclk->sai_data; + + dev_dbg(&sai->pdev->dev, "Disable master clock\n"); + + stm32_sai_sub_reg_up(sai, STM_SAI_CR1_REGX, SAI_XCR1_MCKEN, 0); +} + +static const struct clk_ops mclk_ops = { + .enable = stm32_sai_mclk_enable, + .disable = stm32_sai_mclk_disable, + .recalc_rate = stm32_sai_mclk_recalc_rate, + .round_rate = stm32_sai_mclk_round_rate, + .set_rate = stm32_sai_mclk_set_rate, +}; + +static int stm32_sai_add_mclk_provider(struct stm32_sai_sub_data *sai) +{ + struct clk_hw *hw; + struct stm32_sai_mclk_data *mclk; + struct device *dev = &sai->pdev->dev; + const char *pname = __clk_get_name(sai->sai_ck); + char *mclk_name, *p, *s = (char *)pname; + int ret, i = 0; + + mclk = devm_kzalloc(dev, sizeof(*mclk), GFP_KERNEL); + if (!mclk) + return -ENOMEM; + + mclk_name = devm_kcalloc(dev, sizeof(char), + SAI_MCLK_NAME_LEN, GFP_KERNEL); + if (!mclk_name) + return -ENOMEM; + + /* + * Forge mclk clock name from parent clock name and suffix. + * String after "_" char is stripped in parent name. + */ + p = mclk_name; + while (*s && *s != '_' && (i < (SAI_MCLK_NAME_LEN - 7))) { + *p++ = *s++; + i++; + } + STM_SAI_IS_SUB_A(sai) ? strcat(p, "a_mclk") : strcat(p, "b_mclk"); + + mclk->hw.init = CLK_HW_INIT(mclk_name, pname, &mclk_ops, 0); + mclk->sai_data = sai; + hw = &mclk->hw; + + dev_dbg(dev, "Register master clock %s\n", mclk_name); + ret = devm_clk_hw_register(&sai->pdev->dev, hw); + if (ret) { + dev_err(dev, "mclk register returned %d\n", ret); + return ret; + } + sai->sai_mclk = hw->clk; + + /* register mclk provider */ + return devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get, hw); +} + +static irqreturn_t stm32_sai_isr(int irq, void *devid) +{ + struct stm32_sai_sub_data *sai = (struct stm32_sai_sub_data *)devid; + struct platform_device *pdev = sai->pdev; + unsigned int sr, imr, flags; + snd_pcm_state_t status = SNDRV_PCM_STATE_RUNNING; + + stm32_sai_sub_reg_rd(sai, STM_SAI_IMR_REGX, &imr); + stm32_sai_sub_reg_rd(sai, STM_SAI_SR_REGX, &sr); + + flags = sr & imr; + if (!flags) + return IRQ_NONE; + + stm32_sai_sub_reg_wr(sai, STM_SAI_CLRFR_REGX, SAI_XCLRFR_MASK, + SAI_XCLRFR_MASK); + + if (!sai->substream) { + dev_err(&pdev->dev, "Device stopped. Spurious IRQ 0x%x\n", sr); + return IRQ_NONE; + } + + if (flags & SAI_XIMR_OVRUDRIE) { + dev_err(&pdev->dev, "IRQ %s\n", + STM_SAI_IS_PLAYBACK(sai) ? "underrun" : "overrun"); + status = SNDRV_PCM_STATE_XRUN; + } + + if (flags & SAI_XIMR_MUTEDETIE) + dev_dbg(&pdev->dev, "IRQ mute detected\n"); + + if (flags & SAI_XIMR_WCKCFGIE) { + dev_err(&pdev->dev, "IRQ wrong clock configuration\n"); + status = SNDRV_PCM_STATE_DISCONNECTED; + } + + if (flags & SAI_XIMR_CNRDYIE) + dev_err(&pdev->dev, "IRQ Codec not ready\n"); + + if (flags & SAI_XIMR_AFSDETIE) { + dev_err(&pdev->dev, "IRQ Anticipated frame synchro\n"); + status = SNDRV_PCM_STATE_XRUN; + } + + if (flags & SAI_XIMR_LFSDETIE) { + dev_err(&pdev->dev, "IRQ Late frame synchro\n"); + status = SNDRV_PCM_STATE_XRUN; + } + + spin_lock(&sai->irq_lock); + if (status != SNDRV_PCM_STATE_RUNNING && sai->substream) + snd_pcm_stop_xrun(sai->substream); + spin_unlock(&sai->irq_lock); + + return IRQ_HANDLED; +} + +static int stm32_sai_set_sysclk(struct snd_soc_dai *cpu_dai, + int clk_id, unsigned int freq, int dir) +{ + struct stm32_sai_sub_data *sai = snd_soc_dai_get_drvdata(cpu_dai); + int ret; + + if (dir == SND_SOC_CLOCK_OUT && sai->sai_mclk) { + ret = stm32_sai_sub_reg_up(sai, STM_SAI_CR1_REGX, + SAI_XCR1_NODIV, + freq ? 0 : SAI_XCR1_NODIV); + if (ret < 0) + return ret; + + /* Assume shutdown if requested frequency is 0Hz */ + if (!freq) { + /* Release mclk rate only if rate was actually set */ + if (sai->mclk_rate) { + clk_rate_exclusive_put(sai->sai_mclk); + sai->mclk_rate = 0; + } + return 0; + } + + /* If master clock is used, set parent clock now */ + ret = stm32_sai_set_parent_clock(sai, freq); + if (ret) + return ret; + + ret = clk_set_rate_exclusive(sai->sai_mclk, freq); + if (ret) { + dev_err(cpu_dai->dev, + ret == -EBUSY ? + "Active streams have incompatible rates" : + "Could not set mclk rate\n"); + return ret; + } + + dev_dbg(cpu_dai->dev, "SAI MCLK frequency is %uHz\n", freq); + sai->mclk_rate = freq; + } + + return 0; +} + +static int stm32_sai_set_dai_tdm_slot(struct snd_soc_dai *cpu_dai, u32 tx_mask, + u32 rx_mask, int slots, int slot_width) +{ + struct stm32_sai_sub_data *sai = snd_soc_dai_get_drvdata(cpu_dai); + int slotr, slotr_mask, slot_size; + + if (STM_SAI_PROTOCOL_IS_SPDIF(sai)) { + dev_warn(cpu_dai->dev, "Slot setting relevant only for TDM\n"); + return 0; + } + + dev_dbg(cpu_dai->dev, "Masks tx/rx:%#x/%#x, slots:%d, width:%d\n", + tx_mask, rx_mask, slots, slot_width); + + switch (slot_width) { + case 16: + slot_size = SAI_SLOT_SIZE_16; + break; + case 32: + slot_size = SAI_SLOT_SIZE_32; + break; + default: + slot_size = SAI_SLOT_SIZE_AUTO; + break; + } + + slotr = SAI_XSLOTR_SLOTSZ_SET(slot_size) | + SAI_XSLOTR_NBSLOT_SET(slots - 1); + slotr_mask = SAI_XSLOTR_SLOTSZ_MASK | SAI_XSLOTR_NBSLOT_MASK; + + /* tx/rx mask set in machine init, if slot number defined in DT */ + if (STM_SAI_IS_PLAYBACK(sai)) { + sai->slot_mask = tx_mask; + slotr |= SAI_XSLOTR_SLOTEN_SET(tx_mask); + } + + if (STM_SAI_IS_CAPTURE(sai)) { + sai->slot_mask = rx_mask; + slotr |= SAI_XSLOTR_SLOTEN_SET(rx_mask); + } + + slotr_mask |= SAI_XSLOTR_SLOTEN_MASK; + + stm32_sai_sub_reg_up(sai, STM_SAI_SLOTR_REGX, slotr_mask, slotr); + + sai->slot_width = slot_width; + sai->slots = slots; + + return 0; +} + +static int stm32_sai_set_dai_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt) +{ + struct stm32_sai_sub_data *sai = snd_soc_dai_get_drvdata(cpu_dai); + int cr1, frcr = 0; + int cr1_mask, frcr_mask = 0; + int ret; + + dev_dbg(cpu_dai->dev, "fmt %x\n", fmt); + + /* Do not generate master by default */ + cr1 = SAI_XCR1_NODIV; + cr1_mask = SAI_XCR1_NODIV; + + cr1_mask |= SAI_XCR1_PRTCFG_MASK; + if (STM_SAI_PROTOCOL_IS_SPDIF(sai)) { + cr1 |= SAI_XCR1_PRTCFG_SET(SAI_SPDIF_PROTOCOL); + goto conf_update; + } + + cr1 |= SAI_XCR1_PRTCFG_SET(SAI_FREE_PROTOCOL); + + switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) { + /* SCK active high for all protocols */ + case SND_SOC_DAIFMT_I2S: + cr1 |= SAI_XCR1_CKSTR; + frcr |= SAI_XFRCR_FSOFF | SAI_XFRCR_FSDEF; + break; + /* Left justified */ + case SND_SOC_DAIFMT_MSB: + frcr |= SAI_XFRCR_FSPOL | SAI_XFRCR_FSDEF; + break; + /* Right justified */ + case SND_SOC_DAIFMT_LSB: + frcr |= SAI_XFRCR_FSPOL | SAI_XFRCR_FSDEF; + break; + case SND_SOC_DAIFMT_DSP_A: + frcr |= SAI_XFRCR_FSPOL | SAI_XFRCR_FSOFF; + break; + case SND_SOC_DAIFMT_DSP_B: + frcr |= SAI_XFRCR_FSPOL; + break; + default: + dev_err(cpu_dai->dev, "Unsupported protocol %#x\n", + fmt & SND_SOC_DAIFMT_FORMAT_MASK); + return -EINVAL; + } + + cr1_mask |= SAI_XCR1_CKSTR; + frcr_mask |= SAI_XFRCR_FSPOL | SAI_XFRCR_FSOFF | + SAI_XFRCR_FSDEF; + + /* DAI clock strobing. Invert setting previously set */ + switch (fmt & SND_SOC_DAIFMT_INV_MASK) { + case SND_SOC_DAIFMT_NB_NF: + break; + case SND_SOC_DAIFMT_IB_NF: + cr1 ^= SAI_XCR1_CKSTR; + break; + case SND_SOC_DAIFMT_NB_IF: + frcr ^= SAI_XFRCR_FSPOL; + break; + case SND_SOC_DAIFMT_IB_IF: + /* Invert fs & sck */ + cr1 ^= SAI_XCR1_CKSTR; + frcr ^= SAI_XFRCR_FSPOL; + break; + default: + dev_err(cpu_dai->dev, "Unsupported strobing %#x\n", + fmt & SND_SOC_DAIFMT_INV_MASK); + return -EINVAL; + } + cr1_mask |= SAI_XCR1_CKSTR; + frcr_mask |= SAI_XFRCR_FSPOL; + + stm32_sai_sub_reg_up(sai, STM_SAI_FRCR_REGX, frcr_mask, frcr); + + /* DAI clock master masks */ + switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) { + case SND_SOC_DAIFMT_CBM_CFM: + /* codec is master */ + cr1 |= SAI_XCR1_SLAVE; + sai->master = false; + break; + case SND_SOC_DAIFMT_CBS_CFS: + sai->master = true; + break; + default: + dev_err(cpu_dai->dev, "Unsupported mode %#x\n", + fmt & SND_SOC_DAIFMT_MASTER_MASK); + return -EINVAL; + } + + /* Set slave mode if sub-block is synchronized with another SAI */ + if (sai->sync) { + dev_dbg(cpu_dai->dev, "Synchronized SAI configured as slave\n"); + cr1 |= SAI_XCR1_SLAVE; + sai->master = false; + } + + cr1_mask |= SAI_XCR1_SLAVE; + +conf_update: + ret = stm32_sai_sub_reg_up(sai, STM_SAI_CR1_REGX, cr1_mask, cr1); + if (ret < 0) { + dev_err(cpu_dai->dev, "Failed to update CR1 register\n"); + return ret; + } + + sai->fmt = fmt; + + return 0; +} + +static int stm32_sai_startup(struct snd_pcm_substream *substream, + struct snd_soc_dai *cpu_dai) +{ + struct stm32_sai_sub_data *sai = snd_soc_dai_get_drvdata(cpu_dai); + int imr, cr2, ret; + unsigned long flags; + + spin_lock_irqsave(&sai->irq_lock, flags); + sai->substream = substream; + spin_unlock_irqrestore(&sai->irq_lock, flags); + + if (STM_SAI_PROTOCOL_IS_SPDIF(sai)) { + snd_pcm_hw_constraint_mask64(substream->runtime, + SNDRV_PCM_HW_PARAM_FORMAT, + SNDRV_PCM_FMTBIT_S32_LE); + snd_pcm_hw_constraint_single(substream->runtime, + SNDRV_PCM_HW_PARAM_CHANNELS, 2); + } + + ret = clk_prepare_enable(sai->sai_ck); + if (ret < 0) { + dev_err(cpu_dai->dev, "Failed to enable clock: %d\n", ret); + return ret; + } + + /* Enable ITs */ + stm32_sai_sub_reg_wr(sai, STM_SAI_CLRFR_REGX, + SAI_XCLRFR_MASK, SAI_XCLRFR_MASK); + + imr = SAI_XIMR_OVRUDRIE; + if (STM_SAI_IS_CAPTURE(sai)) { + stm32_sai_sub_reg_rd(sai, STM_SAI_CR2_REGX, &cr2); + if (cr2 & SAI_XCR2_MUTECNT_MASK) + imr |= SAI_XIMR_MUTEDETIE; + } + + if (sai->master) + imr |= SAI_XIMR_WCKCFGIE; + else + imr |= SAI_XIMR_AFSDETIE | SAI_XIMR_LFSDETIE; + + stm32_sai_sub_reg_up(sai, STM_SAI_IMR_REGX, + SAI_XIMR_MASK, imr); + + return 0; +} + +static int stm32_sai_set_config(struct snd_soc_dai *cpu_dai, + struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params) +{ + struct stm32_sai_sub_data *sai = snd_soc_dai_get_drvdata(cpu_dai); + int cr1, cr1_mask, ret; + + /* + * DMA bursts increment is set to 4 words. + * SAI fifo threshold is set to half fifo, to keep enough space + * for DMA incoming bursts. + */ + stm32_sai_sub_reg_wr(sai, STM_SAI_CR2_REGX, + SAI_XCR2_FFLUSH | SAI_XCR2_FTH_MASK, + SAI_XCR2_FFLUSH | + SAI_XCR2_FTH_SET(STM_SAI_FIFO_TH_HALF)); + + /* DS bits in CR1 not set for SPDIF (size forced to 24 bits).*/ + if (STM_SAI_PROTOCOL_IS_SPDIF(sai)) { + sai->spdif_frm_cnt = 0; + return 0; + } + + /* Mode, data format and channel config */ + cr1_mask = SAI_XCR1_DS_MASK; + switch (params_format(params)) { + case SNDRV_PCM_FORMAT_S8: + cr1 = SAI_XCR1_DS_SET(SAI_DATASIZE_8); + break; + case SNDRV_PCM_FORMAT_S16_LE: + cr1 = SAI_XCR1_DS_SET(SAI_DATASIZE_16); + break; + case SNDRV_PCM_FORMAT_S32_LE: + cr1 = SAI_XCR1_DS_SET(SAI_DATASIZE_32); + break; + default: + dev_err(cpu_dai->dev, "Data format not supported\n"); + return -EINVAL; + } + + cr1_mask |= SAI_XCR1_MONO; + if ((sai->slots == 2) && (params_channels(params) == 1)) + cr1 |= SAI_XCR1_MONO; + + ret = stm32_sai_sub_reg_up(sai, STM_SAI_CR1_REGX, cr1_mask, cr1); + if (ret < 0) { + dev_err(cpu_dai->dev, "Failed to update CR1 register\n"); + return ret; + } + + return 0; +} + +static int stm32_sai_set_slots(struct snd_soc_dai *cpu_dai) +{ + struct stm32_sai_sub_data *sai = snd_soc_dai_get_drvdata(cpu_dai); + int slotr, slot_sz; + + stm32_sai_sub_reg_rd(sai, STM_SAI_SLOTR_REGX, &slotr); + + /* + * If SLOTSZ is set to auto in SLOTR, align slot width on data size + * By default slot width = data size, if not forced from DT + */ + slot_sz = slotr & SAI_XSLOTR_SLOTSZ_MASK; + if (slot_sz == SAI_XSLOTR_SLOTSZ_SET(SAI_SLOT_SIZE_AUTO)) + sai->slot_width = sai->data_size; + + if (sai->slot_width < sai->data_size) { + dev_err(cpu_dai->dev, + "Data size %d larger than slot width\n", + sai->data_size); + return -EINVAL; + } + + /* Slot number is set to 2, if not specified in DT */ + if (!sai->slots) + sai->slots = 2; + + /* The number of slots in the audio frame is equal to NBSLOT[3:0] + 1*/ + stm32_sai_sub_reg_up(sai, STM_SAI_SLOTR_REGX, + SAI_XSLOTR_NBSLOT_MASK, + SAI_XSLOTR_NBSLOT_SET((sai->slots - 1))); + + /* Set default slots mask if not already set from DT */ + if (!(slotr & SAI_XSLOTR_SLOTEN_MASK)) { + sai->slot_mask = (1 << sai->slots) - 1; + stm32_sai_sub_reg_up(sai, + STM_SAI_SLOTR_REGX, SAI_XSLOTR_SLOTEN_MASK, + SAI_XSLOTR_SLOTEN_SET(sai->slot_mask)); + } + + dev_dbg(cpu_dai->dev, "Slots %d, slot width %d\n", + sai->slots, sai->slot_width); + + return 0; +} + +static void stm32_sai_set_frame(struct snd_soc_dai *cpu_dai) +{ + struct stm32_sai_sub_data *sai = snd_soc_dai_get_drvdata(cpu_dai); + int fs_active, offset, format; + int frcr, frcr_mask; + + format = sai->fmt & SND_SOC_DAIFMT_FORMAT_MASK; + sai->fs_length = sai->slot_width * sai->slots; + + fs_active = sai->fs_length / 2; + if ((format == SND_SOC_DAIFMT_DSP_A) || + (format == SND_SOC_DAIFMT_DSP_B)) + fs_active = 1; + + frcr = SAI_XFRCR_FRL_SET((sai->fs_length - 1)); + frcr |= SAI_XFRCR_FSALL_SET((fs_active - 1)); + frcr_mask = SAI_XFRCR_FRL_MASK | SAI_XFRCR_FSALL_MASK; + + dev_dbg(cpu_dai->dev, "Frame length %d, frame active %d\n", + sai->fs_length, fs_active); + + stm32_sai_sub_reg_up(sai, STM_SAI_FRCR_REGX, frcr_mask, frcr); + + if ((sai->fmt & SND_SOC_DAIFMT_FORMAT_MASK) == SND_SOC_DAIFMT_LSB) { + offset = sai->slot_width - sai->data_size; + + stm32_sai_sub_reg_up(sai, STM_SAI_SLOTR_REGX, + SAI_XSLOTR_FBOFF_MASK, + SAI_XSLOTR_FBOFF_SET(offset)); + } +} + +static void stm32_sai_init_iec958_status(struct stm32_sai_sub_data *sai) +{ + unsigned char *cs = sai->iec958.status; + + cs[0] = IEC958_AES0_CON_NOT_COPYRIGHT | IEC958_AES0_CON_EMPHASIS_NONE; + cs[1] = IEC958_AES1_CON_GENERAL; + cs[2] = IEC958_AES2_CON_SOURCE_UNSPEC | IEC958_AES2_CON_CHANNEL_UNSPEC; + cs[3] = IEC958_AES3_CON_CLOCK_1000PPM | IEC958_AES3_CON_FS_NOTID; +} + +static void stm32_sai_set_iec958_status(struct stm32_sai_sub_data *sai, + struct snd_pcm_runtime *runtime) +{ + if (!runtime) + return; + + /* Force the sample rate according to runtime rate */ + mutex_lock(&sai->ctrl_lock); + switch (runtime->rate) { + case 22050: + sai->iec958.status[3] = IEC958_AES3_CON_FS_22050; + break; + case 44100: + sai->iec958.status[3] = IEC958_AES3_CON_FS_44100; + break; + case 88200: + sai->iec958.status[3] = IEC958_AES3_CON_FS_88200; + break; + case 176400: + sai->iec958.status[3] = IEC958_AES3_CON_FS_176400; + break; + case 24000: + sai->iec958.status[3] = IEC958_AES3_CON_FS_24000; + break; + case 48000: + sai->iec958.status[3] = IEC958_AES3_CON_FS_48000; + break; + case 96000: + sai->iec958.status[3] = IEC958_AES3_CON_FS_96000; + break; + case 192000: + sai->iec958.status[3] = IEC958_AES3_CON_FS_192000; + break; + case 32000: + sai->iec958.status[3] = IEC958_AES3_CON_FS_32000; + break; + default: + sai->iec958.status[3] = IEC958_AES3_CON_FS_NOTID; + break; + } + mutex_unlock(&sai->ctrl_lock); +} + +static int stm32_sai_configure_clock(struct snd_soc_dai *cpu_dai, + struct snd_pcm_hw_params *params) +{ + struct stm32_sai_sub_data *sai = snd_soc_dai_get_drvdata(cpu_dai); + int div = 0, cr1 = 0; + int sai_clk_rate, mclk_ratio, den; + unsigned int rate = params_rate(params); + int ret; + + if (!sai->sai_mclk) { + ret = stm32_sai_set_parent_clock(sai, rate); + if (ret) + return ret; + } + sai_clk_rate = clk_get_rate(sai->sai_ck); + + if (STM_SAI_IS_F4(sai->pdata)) { + /* mclk on (NODIV=0) + * mclk_rate = 256 * fs + * MCKDIV = 0 if sai_ck < 3/2 * mclk_rate + * MCKDIV = sai_ck / (2 * mclk_rate) otherwise + * mclk off (NODIV=1) + * MCKDIV ignored. sck = sai_ck + */ + if (!sai->mclk_rate) + return 0; + + if (2 * sai_clk_rate >= 3 * sai->mclk_rate) { + div = stm32_sai_get_clk_div(sai, sai_clk_rate, + 2 * sai->mclk_rate); + if (div < 0) + return div; + } + } else { + /* + * TDM mode : + * mclk on + * MCKDIV = sai_ck / (ws x 256) (NOMCK=0. OSR=0) + * MCKDIV = sai_ck / (ws x 512) (NOMCK=0. OSR=1) + * mclk off + * MCKDIV = sai_ck / (frl x ws) (NOMCK=1) + * Note: NOMCK/NODIV correspond to same bit. + */ + if (STM_SAI_PROTOCOL_IS_SPDIF(sai)) { + div = stm32_sai_get_clk_div(sai, sai_clk_rate, + rate * 128); + if (div < 0) + return div; + } else { + if (sai->mclk_rate) { + mclk_ratio = sai->mclk_rate / rate; + if (mclk_ratio == 512) { + cr1 = SAI_XCR1_OSR; + } else if (mclk_ratio != 256) { + dev_err(cpu_dai->dev, + "Wrong mclk ratio %d\n", + mclk_ratio); + return -EINVAL; + } + + stm32_sai_sub_reg_up(sai, + STM_SAI_CR1_REGX, + SAI_XCR1_OSR, cr1); + + div = stm32_sai_get_clk_div(sai, sai_clk_rate, + sai->mclk_rate); + if (div < 0) + return div; + } else { + /* mclk-fs not set, master clock not active */ + den = sai->fs_length * params_rate(params); + div = stm32_sai_get_clk_div(sai, sai_clk_rate, + den); + if (div < 0) + return div; + } + } + } + + return stm32_sai_set_clk_div(sai, div); +} + +static int stm32_sai_hw_params(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params, + struct snd_soc_dai *cpu_dai) +{ + struct stm32_sai_sub_data *sai = snd_soc_dai_get_drvdata(cpu_dai); + int ret; + + sai->data_size = params_width(params); + + if (STM_SAI_PROTOCOL_IS_SPDIF(sai)) { + /* Rate not already set in runtime structure */ + substream->runtime->rate = params_rate(params); + stm32_sai_set_iec958_status(sai, substream->runtime); + } else { + ret = stm32_sai_set_slots(cpu_dai); + if (ret < 0) + return ret; + stm32_sai_set_frame(cpu_dai); + } + + ret = stm32_sai_set_config(cpu_dai, substream, params); + if (ret) + return ret; + + if (sai->master) + ret = stm32_sai_configure_clock(cpu_dai, params); + + return ret; +} + +static int stm32_sai_trigger(struct snd_pcm_substream *substream, int cmd, + struct snd_soc_dai *cpu_dai) +{ + struct stm32_sai_sub_data *sai = snd_soc_dai_get_drvdata(cpu_dai); + int ret; + + switch (cmd) { + case SNDRV_PCM_TRIGGER_START: + case SNDRV_PCM_TRIGGER_RESUME: + case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: + dev_dbg(cpu_dai->dev, "Enable DMA and SAI\n"); + + stm32_sai_sub_reg_up(sai, STM_SAI_CR1_REGX, + SAI_XCR1_DMAEN, SAI_XCR1_DMAEN); + + /* Enable SAI */ + ret = stm32_sai_sub_reg_up(sai, STM_SAI_CR1_REGX, + SAI_XCR1_SAIEN, SAI_XCR1_SAIEN); + if (ret < 0) + dev_err(cpu_dai->dev, "Failed to update CR1 register\n"); + break; + case SNDRV_PCM_TRIGGER_SUSPEND: + case SNDRV_PCM_TRIGGER_PAUSE_PUSH: + case SNDRV_PCM_TRIGGER_STOP: + dev_dbg(cpu_dai->dev, "Disable DMA and SAI\n"); + + stm32_sai_sub_reg_up(sai, STM_SAI_IMR_REGX, + SAI_XIMR_MASK, 0); + + stm32_sai_sub_reg_up(sai, STM_SAI_CR1_REGX, + SAI_XCR1_SAIEN, + (unsigned int)~SAI_XCR1_SAIEN); + + ret = stm32_sai_sub_reg_up(sai, STM_SAI_CR1_REGX, + SAI_XCR1_DMAEN, + (unsigned int)~SAI_XCR1_DMAEN); + if (ret < 0) + dev_err(cpu_dai->dev, "Failed to update CR1 register\n"); + + if (STM_SAI_PROTOCOL_IS_SPDIF(sai)) + sai->spdif_frm_cnt = 0; + break; + default: + return -EINVAL; + } + + return ret; +} + +static void stm32_sai_shutdown(struct snd_pcm_substream *substream, + struct snd_soc_dai *cpu_dai) +{ + struct stm32_sai_sub_data *sai = snd_soc_dai_get_drvdata(cpu_dai); + unsigned long flags; + + stm32_sai_sub_reg_up(sai, STM_SAI_IMR_REGX, SAI_XIMR_MASK, 0); + + clk_disable_unprepare(sai->sai_ck); + + spin_lock_irqsave(&sai->irq_lock, flags); + sai->substream = NULL; + spin_unlock_irqrestore(&sai->irq_lock, flags); +} + +static int stm32_sai_pcm_new(struct snd_soc_pcm_runtime *rtd, + struct snd_soc_dai *cpu_dai) +{ + struct stm32_sai_sub_data *sai = dev_get_drvdata(cpu_dai->dev); + struct snd_kcontrol_new knew = iec958_ctls; + + if (STM_SAI_PROTOCOL_IS_SPDIF(sai)) { + dev_dbg(&sai->pdev->dev, "%s: register iec controls", __func__); + knew.device = rtd->pcm->device; + return snd_ctl_add(rtd->pcm->card, snd_ctl_new1(&knew, sai)); + } + + return 0; +} + +static int stm32_sai_dai_probe(struct snd_soc_dai *cpu_dai) +{ + struct stm32_sai_sub_data *sai = dev_get_drvdata(cpu_dai->dev); + int cr1 = 0, cr1_mask, ret; + + sai->cpu_dai = cpu_dai; + + sai->dma_params.addr = (dma_addr_t)(sai->phys_addr + STM_SAI_DR_REGX); + /* + * DMA supports 4, 8 or 16 burst sizes. Burst size 4 is the best choice, + * as it allows bytes, half-word and words transfers. (See DMA fifos + * constraints). + */ + sai->dma_params.maxburst = 4; + if (sai->pdata->conf.fifo_size < 8) + sai->dma_params.maxburst = 1; + /* Buswidth will be set by framework at runtime */ + sai->dma_params.addr_width = DMA_SLAVE_BUSWIDTH_UNDEFINED; + + if (STM_SAI_IS_PLAYBACK(sai)) + snd_soc_dai_init_dma_data(cpu_dai, &sai->dma_params, NULL); + else + snd_soc_dai_init_dma_data(cpu_dai, NULL, &sai->dma_params); + + /* Next settings are not relevant for spdif mode */ + if (STM_SAI_PROTOCOL_IS_SPDIF(sai)) + return 0; + + cr1_mask = SAI_XCR1_RX_TX; + if (STM_SAI_IS_CAPTURE(sai)) + cr1 |= SAI_XCR1_RX_TX; + + /* Configure synchronization */ + if (sai->sync == SAI_SYNC_EXTERNAL) { + /* Configure synchro client and provider */ + ret = sai->pdata->set_sync(sai->pdata, sai->np_sync_provider, + sai->synco, sai->synci); + if (ret) + return ret; + } + + cr1_mask |= SAI_XCR1_SYNCEN_MASK; + cr1 |= SAI_XCR1_SYNCEN_SET(sai->sync); + + return stm32_sai_sub_reg_up(sai, STM_SAI_CR1_REGX, cr1_mask, cr1); +} + +static const struct snd_soc_dai_ops stm32_sai_pcm_dai_ops = { + .set_sysclk = stm32_sai_set_sysclk, + .set_fmt = stm32_sai_set_dai_fmt, + .set_tdm_slot = stm32_sai_set_dai_tdm_slot, + .startup = stm32_sai_startup, + .hw_params = stm32_sai_hw_params, + .trigger = stm32_sai_trigger, + .shutdown = stm32_sai_shutdown, +}; + +static int stm32_sai_pcm_process_spdif(struct snd_pcm_substream *substream, + int channel, unsigned long hwoff, + void *buf, unsigned long bytes) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); + struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0); + struct stm32_sai_sub_data *sai = dev_get_drvdata(cpu_dai->dev); + int *ptr = (int *)(runtime->dma_area + hwoff + + channel * (runtime->dma_bytes / runtime->channels)); + ssize_t cnt = bytes_to_samples(runtime, bytes); + unsigned int frm_cnt = sai->spdif_frm_cnt; + unsigned int byte; + unsigned int mask; + + do { + *ptr = ((*ptr >> 8) & 0x00ffffff); + + /* Set channel status bit */ + byte = frm_cnt >> 3; + mask = 1 << (frm_cnt - (byte << 3)); + if (sai->iec958.status[byte] & mask) + *ptr |= 0x04000000; + ptr++; + + if (!(cnt % 2)) + frm_cnt++; + + if (frm_cnt == SAI_IEC60958_BLOCK_FRAMES) + frm_cnt = 0; + } while (--cnt); + sai->spdif_frm_cnt = frm_cnt; + + return 0; +} + +/* No support of mmap in S/PDIF mode */ +static const struct snd_pcm_hardware stm32_sai_pcm_hw_spdif = { + .info = SNDRV_PCM_INFO_INTERLEAVED, + .buffer_bytes_max = 8 * PAGE_SIZE, + .period_bytes_min = 1024, + .period_bytes_max = PAGE_SIZE, + .periods_min = 2, + .periods_max = 8, +}; + +static const struct snd_pcm_hardware stm32_sai_pcm_hw = { + .info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_MMAP, + .buffer_bytes_max = 8 * PAGE_SIZE, + .period_bytes_min = 1024, /* 5ms at 48kHz */ + .period_bytes_max = PAGE_SIZE, + .periods_min = 2, + .periods_max = 8, +}; + +static struct snd_soc_dai_driver stm32_sai_playback_dai = { + .probe = stm32_sai_dai_probe, + .pcm_new = stm32_sai_pcm_new, + .id = 1, /* avoid call to fmt_single_name() */ + .playback = { + .channels_min = 1, + .channels_max = 2, + .rate_min = 8000, + .rate_max = 192000, + .rates = SNDRV_PCM_RATE_CONTINUOUS, + /* DMA does not support 24 bits transfers */ + .formats = + SNDRV_PCM_FMTBIT_S8 | + SNDRV_PCM_FMTBIT_S16_LE | + SNDRV_PCM_FMTBIT_S32_LE, + }, + .ops = &stm32_sai_pcm_dai_ops, +}; + +static struct snd_soc_dai_driver stm32_sai_capture_dai = { + .probe = stm32_sai_dai_probe, + .id = 1, /* avoid call to fmt_single_name() */ + .capture = { + .channels_min = 1, + .channels_max = 2, + .rate_min = 8000, + .rate_max = 192000, + .rates = SNDRV_PCM_RATE_CONTINUOUS, + /* DMA does not support 24 bits transfers */ + .formats = + SNDRV_PCM_FMTBIT_S8 | + SNDRV_PCM_FMTBIT_S16_LE | + SNDRV_PCM_FMTBIT_S32_LE, + }, + .ops = &stm32_sai_pcm_dai_ops, +}; + +static const struct snd_dmaengine_pcm_config stm32_sai_pcm_config = { + .pcm_hardware = &stm32_sai_pcm_hw, + .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config, +}; + +static const struct snd_dmaengine_pcm_config stm32_sai_pcm_config_spdif = { + .pcm_hardware = &stm32_sai_pcm_hw_spdif, + .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config, + .process = stm32_sai_pcm_process_spdif, +}; + +static const struct snd_soc_component_driver stm32_component = { + .name = "stm32-sai", +}; + +static const struct of_device_id stm32_sai_sub_ids[] = { + { .compatible = "st,stm32-sai-sub-a", + .data = (void *)STM_SAI_A_ID}, + { .compatible = "st,stm32-sai-sub-b", + .data = (void *)STM_SAI_B_ID}, + {} +}; +MODULE_DEVICE_TABLE(of, stm32_sai_sub_ids); + +static int stm32_sai_sub_parse_of(struct platform_device *pdev, + struct stm32_sai_sub_data *sai) +{ + struct device_node *np = pdev->dev.of_node; + struct resource *res; + void __iomem *base; + struct of_phandle_args args; + int ret; + + if (!np) + return -ENODEV; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(base)) + return PTR_ERR(base); + + sai->phys_addr = res->start; + + sai->regmap_config = &stm32_sai_sub_regmap_config_f4; + /* Note: PDM registers not available for sub-block B */ + if (STM_SAI_HAS_PDM(sai) && STM_SAI_IS_SUB_A(sai)) + sai->regmap_config = &stm32_sai_sub_regmap_config_h7; + + /* + * Do not manage peripheral clock through regmap framework as this + * can lead to circular locking issue with sai master clock provider. + * Manage peripheral clock directly in driver instead. + */ + sai->regmap = devm_regmap_init_mmio(&pdev->dev, base, + sai->regmap_config); + if (IS_ERR(sai->regmap)) { + if (PTR_ERR(sai->regmap) != -EPROBE_DEFER) + dev_err(&pdev->dev, "Regmap init error %ld\n", + PTR_ERR(sai->regmap)); + return PTR_ERR(sai->regmap); + } + + /* Get direction property */ + if (of_property_match_string(np, "dma-names", "tx") >= 0) { + sai->dir = SNDRV_PCM_STREAM_PLAYBACK; + } else if (of_property_match_string(np, "dma-names", "rx") >= 0) { + sai->dir = SNDRV_PCM_STREAM_CAPTURE; + } else { + dev_err(&pdev->dev, "Unsupported direction\n"); + return -EINVAL; + } + + /* Get spdif iec60958 property */ + sai->spdif = false; + if (of_get_property(np, "st,iec60958", NULL)) { + if (!STM_SAI_HAS_SPDIF(sai) || + sai->dir == SNDRV_PCM_STREAM_CAPTURE) { + dev_err(&pdev->dev, "S/PDIF IEC60958 not supported\n"); + return -EINVAL; + } + stm32_sai_init_iec958_status(sai); + sai->spdif = true; + sai->master = true; + } + + /* Get synchronization property */ + args.np = NULL; + ret = of_parse_phandle_with_fixed_args(np, "st,sync", 1, 0, &args); + if (ret < 0 && ret != -ENOENT) { + dev_err(&pdev->dev, "Failed to get st,sync property\n"); + return ret; + } + + sai->sync = SAI_SYNC_NONE; + if (args.np) { + if (args.np == np) { + dev_err(&pdev->dev, "%pOFn sync own reference\n", np); + of_node_put(args.np); + return -EINVAL; + } + + sai->np_sync_provider = of_get_parent(args.np); + if (!sai->np_sync_provider) { + dev_err(&pdev->dev, "%pOFn parent node not found\n", + np); + of_node_put(args.np); + return -ENODEV; + } + + sai->sync = SAI_SYNC_INTERNAL; + if (sai->np_sync_provider != sai->pdata->pdev->dev.of_node) { + if (!STM_SAI_HAS_EXT_SYNC(sai)) { + dev_err(&pdev->dev, + "External synchro not supported\n"); + of_node_put(args.np); + return -EINVAL; + } + sai->sync = SAI_SYNC_EXTERNAL; + + sai->synci = args.args[0]; + if (sai->synci < 1 || + (sai->synci > (SAI_GCR_SYNCIN_MAX + 1))) { + dev_err(&pdev->dev, "Wrong SAI index\n"); + of_node_put(args.np); + return -EINVAL; + } + + if (of_property_match_string(args.np, "compatible", + "st,stm32-sai-sub-a") >= 0) + sai->synco = STM_SAI_SYNC_OUT_A; + + if (of_property_match_string(args.np, "compatible", + "st,stm32-sai-sub-b") >= 0) + sai->synco = STM_SAI_SYNC_OUT_B; + + if (!sai->synco) { + dev_err(&pdev->dev, "Unknown SAI sub-block\n"); + of_node_put(args.np); + return -EINVAL; + } + } + + dev_dbg(&pdev->dev, "%s synchronized with %s\n", + pdev->name, args.np->full_name); + } + + of_node_put(args.np); + sai->sai_ck = devm_clk_get(&pdev->dev, "sai_ck"); + if (IS_ERR(sai->sai_ck)) { + if (PTR_ERR(sai->sai_ck) != -EPROBE_DEFER) + dev_err(&pdev->dev, "Missing kernel clock sai_ck: %ld\n", + PTR_ERR(sai->sai_ck)); + return PTR_ERR(sai->sai_ck); + } + + ret = clk_prepare(sai->pdata->pclk); + if (ret < 0) + return ret; + + if (STM_SAI_IS_F4(sai->pdata)) + return 0; + + /* Register mclk provider if requested */ + if (of_find_property(np, "#clock-cells", NULL)) { + ret = stm32_sai_add_mclk_provider(sai); + if (ret < 0) + return ret; + } else { + sai->sai_mclk = devm_clk_get(&pdev->dev, "MCLK"); + if (IS_ERR(sai->sai_mclk)) { + if (PTR_ERR(sai->sai_mclk) != -ENOENT) + return PTR_ERR(sai->sai_mclk); + sai->sai_mclk = NULL; + } + } + + return 0; +} + +static int stm32_sai_sub_probe(struct platform_device *pdev) +{ + struct stm32_sai_sub_data *sai; + const struct of_device_id *of_id; + const struct snd_dmaengine_pcm_config *conf = &stm32_sai_pcm_config; + int ret; + + sai = devm_kzalloc(&pdev->dev, sizeof(*sai), GFP_KERNEL); + if (!sai) + return -ENOMEM; + + of_id = of_match_device(stm32_sai_sub_ids, &pdev->dev); + if (!of_id) + return -EINVAL; + sai->id = (uintptr_t)of_id->data; + + sai->pdev = pdev; + mutex_init(&sai->ctrl_lock); + spin_lock_init(&sai->irq_lock); + platform_set_drvdata(pdev, sai); + + sai->pdata = dev_get_drvdata(pdev->dev.parent); + if (!sai->pdata) { + dev_err(&pdev->dev, "Parent device data not available\n"); + return -EINVAL; + } + + ret = stm32_sai_sub_parse_of(pdev, sai); + if (ret) + return ret; + + if (STM_SAI_IS_PLAYBACK(sai)) + sai->cpu_dai_drv = stm32_sai_playback_dai; + else + sai->cpu_dai_drv = stm32_sai_capture_dai; + sai->cpu_dai_drv.name = dev_name(&pdev->dev); + + ret = devm_request_irq(&pdev->dev, sai->pdata->irq, stm32_sai_isr, + IRQF_SHARED, dev_name(&pdev->dev), sai); + if (ret) { + dev_err(&pdev->dev, "IRQ request returned %d\n", ret); + return ret; + } + + if (STM_SAI_PROTOCOL_IS_SPDIF(sai)) + conf = &stm32_sai_pcm_config_spdif; + + ret = snd_dmaengine_pcm_register(&pdev->dev, conf, 0); + if (ret) { + if (ret != -EPROBE_DEFER) + dev_err(&pdev->dev, "Could not register pcm dma\n"); + return ret; + } + + ret = snd_soc_register_component(&pdev->dev, &stm32_component, + &sai->cpu_dai_drv, 1); + if (ret) { + snd_dmaengine_pcm_unregister(&pdev->dev); + return ret; + } + + pm_runtime_enable(&pdev->dev); + + return 0; +} + +static int stm32_sai_sub_remove(struct platform_device *pdev) +{ + struct stm32_sai_sub_data *sai = dev_get_drvdata(&pdev->dev); + + clk_unprepare(sai->pdata->pclk); + snd_dmaengine_pcm_unregister(&pdev->dev); + snd_soc_unregister_component(&pdev->dev); + pm_runtime_disable(&pdev->dev); + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int stm32_sai_sub_suspend(struct device *dev) +{ + struct stm32_sai_sub_data *sai = dev_get_drvdata(dev); + int ret; + + ret = clk_enable(sai->pdata->pclk); + if (ret < 0) + return ret; + + regcache_cache_only(sai->regmap, true); + regcache_mark_dirty(sai->regmap); + + clk_disable(sai->pdata->pclk); + + return 0; +} + +static int stm32_sai_sub_resume(struct device *dev) +{ + struct stm32_sai_sub_data *sai = dev_get_drvdata(dev); + int ret; + + ret = clk_enable(sai->pdata->pclk); + if (ret < 0) + return ret; + + regcache_cache_only(sai->regmap, false); + ret = regcache_sync(sai->regmap); + + clk_disable(sai->pdata->pclk); + + return ret; +} +#endif /* CONFIG_PM_SLEEP */ + +static const struct dev_pm_ops stm32_sai_sub_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(stm32_sai_sub_suspend, stm32_sai_sub_resume) +}; + +static struct platform_driver stm32_sai_sub_driver = { + .driver = { + .name = "st,stm32-sai-sub", + .of_match_table = stm32_sai_sub_ids, + .pm = &stm32_sai_sub_pm_ops, + }, + .probe = stm32_sai_sub_probe, + .remove = stm32_sai_sub_remove, +}; + +module_platform_driver(stm32_sai_sub_driver); + +MODULE_DESCRIPTION("STM32 Soc SAI sub-block Interface"); +MODULE_AUTHOR("Olivier Moysan <olivier.moysan@st.com>"); +MODULE_ALIAS("platform:st,stm32-sai-sub"); +MODULE_LICENSE("GPL v2"); diff --git a/sound/soc/stm/stm32_spdifrx.c b/sound/soc/stm/stm32_spdifrx.c new file mode 100644 index 000000000..1bfa3b2ba --- /dev/null +++ b/sound/soc/stm/stm32_spdifrx.c @@ -0,0 +1,1099 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * STM32 ALSA SoC Digital Audio Interface (SPDIF-rx) driver. + * + * Copyright (C) 2017, STMicroelectronics - All Rights Reserved + * Author(s): Olivier Moysan <olivier.moysan@st.com> for STMicroelectronics. + */ + +#include <linux/bitfield.h> +#include <linux/clk.h> +#include <linux/completion.h> +#include <linux/delay.h> +#include <linux/module.h> +#include <linux/of_platform.h> +#include <linux/regmap.h> +#include <linux/reset.h> + +#include <sound/dmaengine_pcm.h> +#include <sound/pcm_params.h> + +/* SPDIF-rx Register Map */ +#define STM32_SPDIFRX_CR 0x00 +#define STM32_SPDIFRX_IMR 0x04 +#define STM32_SPDIFRX_SR 0x08 +#define STM32_SPDIFRX_IFCR 0x0C +#define STM32_SPDIFRX_DR 0x10 +#define STM32_SPDIFRX_CSR 0x14 +#define STM32_SPDIFRX_DIR 0x18 +#define STM32_SPDIFRX_VERR 0x3F4 +#define STM32_SPDIFRX_IDR 0x3F8 +#define STM32_SPDIFRX_SIDR 0x3FC + +/* Bit definition for SPDIF_CR register */ +#define SPDIFRX_CR_SPDIFEN_SHIFT 0 +#define SPDIFRX_CR_SPDIFEN_MASK GENMASK(1, SPDIFRX_CR_SPDIFEN_SHIFT) +#define SPDIFRX_CR_SPDIFENSET(x) ((x) << SPDIFRX_CR_SPDIFEN_SHIFT) + +#define SPDIFRX_CR_RXDMAEN BIT(2) +#define SPDIFRX_CR_RXSTEO BIT(3) + +#define SPDIFRX_CR_DRFMT_SHIFT 4 +#define SPDIFRX_CR_DRFMT_MASK GENMASK(5, SPDIFRX_CR_DRFMT_SHIFT) +#define SPDIFRX_CR_DRFMTSET(x) ((x) << SPDIFRX_CR_DRFMT_SHIFT) + +#define SPDIFRX_CR_PMSK BIT(6) +#define SPDIFRX_CR_VMSK BIT(7) +#define SPDIFRX_CR_CUMSK BIT(8) +#define SPDIFRX_CR_PTMSK BIT(9) +#define SPDIFRX_CR_CBDMAEN BIT(10) +#define SPDIFRX_CR_CHSEL_SHIFT 11 +#define SPDIFRX_CR_CHSEL BIT(SPDIFRX_CR_CHSEL_SHIFT) + +#define SPDIFRX_CR_NBTR_SHIFT 12 +#define SPDIFRX_CR_NBTR_MASK GENMASK(13, SPDIFRX_CR_NBTR_SHIFT) +#define SPDIFRX_CR_NBTRSET(x) ((x) << SPDIFRX_CR_NBTR_SHIFT) + +#define SPDIFRX_CR_WFA BIT(14) + +#define SPDIFRX_CR_INSEL_SHIFT 16 +#define SPDIFRX_CR_INSEL_MASK GENMASK(18, PDIFRX_CR_INSEL_SHIFT) +#define SPDIFRX_CR_INSELSET(x) ((x) << SPDIFRX_CR_INSEL_SHIFT) + +#define SPDIFRX_CR_CKSEN_SHIFT 20 +#define SPDIFRX_CR_CKSEN BIT(20) +#define SPDIFRX_CR_CKSBKPEN BIT(21) + +/* Bit definition for SPDIFRX_IMR register */ +#define SPDIFRX_IMR_RXNEI BIT(0) +#define SPDIFRX_IMR_CSRNEIE BIT(1) +#define SPDIFRX_IMR_PERRIE BIT(2) +#define SPDIFRX_IMR_OVRIE BIT(3) +#define SPDIFRX_IMR_SBLKIE BIT(4) +#define SPDIFRX_IMR_SYNCDIE BIT(5) +#define SPDIFRX_IMR_IFEIE BIT(6) + +#define SPDIFRX_XIMR_MASK GENMASK(6, 0) + +/* Bit definition for SPDIFRX_SR register */ +#define SPDIFRX_SR_RXNE BIT(0) +#define SPDIFRX_SR_CSRNE BIT(1) +#define SPDIFRX_SR_PERR BIT(2) +#define SPDIFRX_SR_OVR BIT(3) +#define SPDIFRX_SR_SBD BIT(4) +#define SPDIFRX_SR_SYNCD BIT(5) +#define SPDIFRX_SR_FERR BIT(6) +#define SPDIFRX_SR_SERR BIT(7) +#define SPDIFRX_SR_TERR BIT(8) + +#define SPDIFRX_SR_WIDTH5_SHIFT 16 +#define SPDIFRX_SR_WIDTH5_MASK GENMASK(30, PDIFRX_SR_WIDTH5_SHIFT) +#define SPDIFRX_SR_WIDTH5SET(x) ((x) << SPDIFRX_SR_WIDTH5_SHIFT) + +/* Bit definition for SPDIFRX_IFCR register */ +#define SPDIFRX_IFCR_PERRCF BIT(2) +#define SPDIFRX_IFCR_OVRCF BIT(3) +#define SPDIFRX_IFCR_SBDCF BIT(4) +#define SPDIFRX_IFCR_SYNCDCF BIT(5) + +#define SPDIFRX_XIFCR_MASK GENMASK(5, 2) + +/* Bit definition for SPDIFRX_DR register (DRFMT = 0b00) */ +#define SPDIFRX_DR0_DR_SHIFT 0 +#define SPDIFRX_DR0_DR_MASK GENMASK(23, SPDIFRX_DR0_DR_SHIFT) +#define SPDIFRX_DR0_DRSET(x) ((x) << SPDIFRX_DR0_DR_SHIFT) + +#define SPDIFRX_DR0_PE BIT(24) + +#define SPDIFRX_DR0_V BIT(25) +#define SPDIFRX_DR0_U BIT(26) +#define SPDIFRX_DR0_C BIT(27) + +#define SPDIFRX_DR0_PT_SHIFT 28 +#define SPDIFRX_DR0_PT_MASK GENMASK(29, SPDIFRX_DR0_PT_SHIFT) +#define SPDIFRX_DR0_PTSET(x) ((x) << SPDIFRX_DR0_PT_SHIFT) + +/* Bit definition for SPDIFRX_DR register (DRFMT = 0b01) */ +#define SPDIFRX_DR1_PE BIT(0) +#define SPDIFRX_DR1_V BIT(1) +#define SPDIFRX_DR1_U BIT(2) +#define SPDIFRX_DR1_C BIT(3) + +#define SPDIFRX_DR1_PT_SHIFT 4 +#define SPDIFRX_DR1_PT_MASK GENMASK(5, SPDIFRX_DR1_PT_SHIFT) +#define SPDIFRX_DR1_PTSET(x) ((x) << SPDIFRX_DR1_PT_SHIFT) + +#define SPDIFRX_DR1_DR_SHIFT 8 +#define SPDIFRX_DR1_DR_MASK GENMASK(31, SPDIFRX_DR1_DR_SHIFT) +#define SPDIFRX_DR1_DRSET(x) ((x) << SPDIFRX_DR1_DR_SHIFT) + +/* Bit definition for SPDIFRX_DR register (DRFMT = 0b10) */ +#define SPDIFRX_DR1_DRNL1_SHIFT 0 +#define SPDIFRX_DR1_DRNL1_MASK GENMASK(15, SPDIFRX_DR1_DRNL1_SHIFT) +#define SPDIFRX_DR1_DRNL1SET(x) ((x) << SPDIFRX_DR1_DRNL1_SHIFT) + +#define SPDIFRX_DR1_DRNL2_SHIFT 16 +#define SPDIFRX_DR1_DRNL2_MASK GENMASK(31, SPDIFRX_DR1_DRNL2_SHIFT) +#define SPDIFRX_DR1_DRNL2SET(x) ((x) << SPDIFRX_DR1_DRNL2_SHIFT) + +/* Bit definition for SPDIFRX_CSR register */ +#define SPDIFRX_CSR_USR_SHIFT 0 +#define SPDIFRX_CSR_USR_MASK GENMASK(15, SPDIFRX_CSR_USR_SHIFT) +#define SPDIFRX_CSR_USRGET(x) (((x) & SPDIFRX_CSR_USR_MASK)\ + >> SPDIFRX_CSR_USR_SHIFT) + +#define SPDIFRX_CSR_CS_SHIFT 16 +#define SPDIFRX_CSR_CS_MASK GENMASK(23, SPDIFRX_CSR_CS_SHIFT) +#define SPDIFRX_CSR_CSGET(x) (((x) & SPDIFRX_CSR_CS_MASK)\ + >> SPDIFRX_CSR_CS_SHIFT) + +#define SPDIFRX_CSR_SOB BIT(24) + +/* Bit definition for SPDIFRX_DIR register */ +#define SPDIFRX_DIR_THI_SHIFT 0 +#define SPDIFRX_DIR_THI_MASK GENMASK(12, SPDIFRX_DIR_THI_SHIFT) +#define SPDIFRX_DIR_THI_SET(x) ((x) << SPDIFRX_DIR_THI_SHIFT) + +#define SPDIFRX_DIR_TLO_SHIFT 16 +#define SPDIFRX_DIR_TLO_MASK GENMASK(28, SPDIFRX_DIR_TLO_SHIFT) +#define SPDIFRX_DIR_TLO_SET(x) ((x) << SPDIFRX_DIR_TLO_SHIFT) + +#define SPDIFRX_SPDIFEN_DISABLE 0x0 +#define SPDIFRX_SPDIFEN_SYNC 0x1 +#define SPDIFRX_SPDIFEN_ENABLE 0x3 + +/* Bit definition for SPDIFRX_VERR register */ +#define SPDIFRX_VERR_MIN_MASK GENMASK(3, 0) +#define SPDIFRX_VERR_MAJ_MASK GENMASK(7, 4) + +/* Bit definition for SPDIFRX_IDR register */ +#define SPDIFRX_IDR_ID_MASK GENMASK(31, 0) + +/* Bit definition for SPDIFRX_SIDR register */ +#define SPDIFRX_SIDR_SID_MASK GENMASK(31, 0) + +#define SPDIFRX_IPIDR_NUMBER 0x00130041 + +#define SPDIFRX_IN1 0x1 +#define SPDIFRX_IN2 0x2 +#define SPDIFRX_IN3 0x3 +#define SPDIFRX_IN4 0x4 +#define SPDIFRX_IN5 0x5 +#define SPDIFRX_IN6 0x6 +#define SPDIFRX_IN7 0x7 +#define SPDIFRX_IN8 0x8 + +#define SPDIFRX_NBTR_NONE 0x0 +#define SPDIFRX_NBTR_3 0x1 +#define SPDIFRX_NBTR_15 0x2 +#define SPDIFRX_NBTR_63 0x3 + +#define SPDIFRX_DRFMT_RIGHT 0x0 +#define SPDIFRX_DRFMT_LEFT 0x1 +#define SPDIFRX_DRFMT_PACKED 0x2 + +/* 192 CS bits in S/PDIF frame. i.e 24 CS bytes */ +#define SPDIFRX_CS_BYTES_NB 24 +#define SPDIFRX_UB_BYTES_NB 48 + +/* + * CSR register is retrieved as a 32 bits word + * It contains 1 channel status byte and 2 user data bytes + * 2 S/PDIF frames are acquired to get all CS/UB bits + */ +#define SPDIFRX_CSR_BUF_LENGTH (SPDIFRX_CS_BYTES_NB * 4 * 2) + +/** + * struct stm32_spdifrx_data - private data of SPDIFRX + * @pdev: device data pointer + * @base: mmio register base virtual address + * @regmap: SPDIFRX register map pointer + * @regmap_conf: SPDIFRX register map configuration pointer + * @cs_completion: channel status retrieving completion + * @kclk: kernel clock feeding the SPDIFRX clock generator + * @dma_params: dma configuration data for rx channel + * @substream: PCM substream data pointer + * @dmab: dma buffer info pointer + * @ctrl_chan: dma channel for S/PDIF control bits + * @desc:dma async transaction descriptor + * @slave_config: dma slave channel runtime config pointer + * @phys_addr: SPDIFRX registers physical base address + * @lock: synchronization enabling lock + * @irq_lock: prevent race condition with IRQ on stream state + * @cs: channel status buffer + * @ub: user data buffer + * @irq: SPDIFRX interrupt line + * @refcount: keep count of opened DMA channels + */ +struct stm32_spdifrx_data { + struct platform_device *pdev; + void __iomem *base; + struct regmap *regmap; + const struct regmap_config *regmap_conf; + struct completion cs_completion; + struct clk *kclk; + struct snd_dmaengine_dai_dma_data dma_params; + struct snd_pcm_substream *substream; + struct snd_dma_buffer *dmab; + struct dma_chan *ctrl_chan; + struct dma_async_tx_descriptor *desc; + struct dma_slave_config slave_config; + dma_addr_t phys_addr; + spinlock_t lock; /* Sync enabling lock */ + spinlock_t irq_lock; /* Prevent race condition on stream state */ + unsigned char cs[SPDIFRX_CS_BYTES_NB]; + unsigned char ub[SPDIFRX_UB_BYTES_NB]; + int irq; + int refcount; +}; + +static void stm32_spdifrx_dma_complete(void *data) +{ + struct stm32_spdifrx_data *spdifrx = (struct stm32_spdifrx_data *)data; + struct platform_device *pdev = spdifrx->pdev; + u32 *p_start = (u32 *)spdifrx->dmab->area; + u32 *p_end = p_start + (2 * SPDIFRX_CS_BYTES_NB) - 1; + u32 *ptr = p_start; + u16 *ub_ptr = (short *)spdifrx->ub; + int i = 0; + + regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR, + SPDIFRX_CR_CBDMAEN, + (unsigned int)~SPDIFRX_CR_CBDMAEN); + + if (!spdifrx->dmab->area) + return; + + while (ptr <= p_end) { + if (*ptr & SPDIFRX_CSR_SOB) + break; + ptr++; + } + + if (ptr > p_end) { + dev_err(&pdev->dev, "Start of S/PDIF block not found\n"); + return; + } + + while (i < SPDIFRX_CS_BYTES_NB) { + spdifrx->cs[i] = (unsigned char)SPDIFRX_CSR_CSGET(*ptr); + *ub_ptr++ = SPDIFRX_CSR_USRGET(*ptr++); + if (ptr > p_end) { + dev_err(&pdev->dev, "Failed to get channel status\n"); + return; + } + i++; + } + + complete(&spdifrx->cs_completion); +} + +static int stm32_spdifrx_dma_ctrl_start(struct stm32_spdifrx_data *spdifrx) +{ + dma_cookie_t cookie; + int err; + + spdifrx->desc = dmaengine_prep_slave_single(spdifrx->ctrl_chan, + spdifrx->dmab->addr, + SPDIFRX_CSR_BUF_LENGTH, + DMA_DEV_TO_MEM, + DMA_CTRL_ACK); + if (!spdifrx->desc) + return -EINVAL; + + spdifrx->desc->callback = stm32_spdifrx_dma_complete; + spdifrx->desc->callback_param = spdifrx; + cookie = dmaengine_submit(spdifrx->desc); + err = dma_submit_error(cookie); + if (err) + return -EINVAL; + + dma_async_issue_pending(spdifrx->ctrl_chan); + + return 0; +} + +static void stm32_spdifrx_dma_ctrl_stop(struct stm32_spdifrx_data *spdifrx) +{ + dmaengine_terminate_async(spdifrx->ctrl_chan); +} + +static int stm32_spdifrx_start_sync(struct stm32_spdifrx_data *spdifrx) +{ + int cr, cr_mask, imr, ret; + unsigned long flags; + + /* Enable IRQs */ + imr = SPDIFRX_IMR_IFEIE | SPDIFRX_IMR_SYNCDIE | SPDIFRX_IMR_PERRIE; + ret = regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_IMR, imr, imr); + if (ret) + return ret; + + spin_lock_irqsave(&spdifrx->lock, flags); + + spdifrx->refcount++; + + regmap_read(spdifrx->regmap, STM32_SPDIFRX_CR, &cr); + + if (!(cr & SPDIFRX_CR_SPDIFEN_MASK)) { + /* + * Start sync if SPDIFRX is still in idle state. + * SPDIFRX reception enabled when sync done + */ + dev_dbg(&spdifrx->pdev->dev, "start synchronization\n"); + + /* + * SPDIFRX configuration: + * Wait for activity before starting sync process. This avoid + * to issue sync errors when spdif signal is missing on input. + * Preamble, CS, user, validity and parity error bits not copied + * to DR register. + */ + cr = SPDIFRX_CR_WFA | SPDIFRX_CR_PMSK | SPDIFRX_CR_VMSK | + SPDIFRX_CR_CUMSK | SPDIFRX_CR_PTMSK | SPDIFRX_CR_RXSTEO; + cr_mask = cr; + + cr |= SPDIFRX_CR_NBTRSET(SPDIFRX_NBTR_63); + cr_mask |= SPDIFRX_CR_NBTR_MASK; + cr |= SPDIFRX_CR_SPDIFENSET(SPDIFRX_SPDIFEN_SYNC); + cr_mask |= SPDIFRX_CR_SPDIFEN_MASK; + ret = regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR, + cr_mask, cr); + if (ret < 0) + dev_err(&spdifrx->pdev->dev, + "Failed to start synchronization\n"); + } + + spin_unlock_irqrestore(&spdifrx->lock, flags); + + return ret; +} + +static void stm32_spdifrx_stop(struct stm32_spdifrx_data *spdifrx) +{ + int cr, cr_mask, reg; + unsigned long flags; + + spin_lock_irqsave(&spdifrx->lock, flags); + + if (--spdifrx->refcount) { + spin_unlock_irqrestore(&spdifrx->lock, flags); + return; + } + + cr = SPDIFRX_CR_SPDIFENSET(SPDIFRX_SPDIFEN_DISABLE); + cr_mask = SPDIFRX_CR_SPDIFEN_MASK | SPDIFRX_CR_RXDMAEN; + + regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR, cr_mask, cr); + + regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_IMR, + SPDIFRX_XIMR_MASK, 0); + + regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_IFCR, + SPDIFRX_XIFCR_MASK, SPDIFRX_XIFCR_MASK); + + /* dummy read to clear CSRNE and RXNE in status register */ + regmap_read(spdifrx->regmap, STM32_SPDIFRX_DR, ®); + regmap_read(spdifrx->regmap, STM32_SPDIFRX_CSR, ®); + + spin_unlock_irqrestore(&spdifrx->lock, flags); +} + +static int stm32_spdifrx_dma_ctrl_register(struct device *dev, + struct stm32_spdifrx_data *spdifrx) +{ + int ret; + + spdifrx->ctrl_chan = dma_request_chan(dev, "rx-ctrl"); + if (IS_ERR(spdifrx->ctrl_chan)) { + if (PTR_ERR(spdifrx->ctrl_chan) != -EPROBE_DEFER) + dev_err(dev, "dma_request_slave_channel error %ld\n", + PTR_ERR(spdifrx->ctrl_chan)); + return PTR_ERR(spdifrx->ctrl_chan); + } + + spdifrx->dmab = devm_kzalloc(dev, sizeof(struct snd_dma_buffer), + GFP_KERNEL); + if (!spdifrx->dmab) + return -ENOMEM; + + spdifrx->dmab->dev.type = SNDRV_DMA_TYPE_DEV_IRAM; + spdifrx->dmab->dev.dev = dev; + ret = snd_dma_alloc_pages(spdifrx->dmab->dev.type, dev, + SPDIFRX_CSR_BUF_LENGTH, spdifrx->dmab); + if (ret < 0) { + dev_err(dev, "snd_dma_alloc_pages returned error %d\n", ret); + return ret; + } + + spdifrx->slave_config.direction = DMA_DEV_TO_MEM; + spdifrx->slave_config.src_addr = (dma_addr_t)(spdifrx->phys_addr + + STM32_SPDIFRX_CSR); + spdifrx->slave_config.dst_addr = spdifrx->dmab->addr; + spdifrx->slave_config.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; + spdifrx->slave_config.src_maxburst = 1; + + ret = dmaengine_slave_config(spdifrx->ctrl_chan, + &spdifrx->slave_config); + if (ret < 0) { + dev_err(dev, "dmaengine_slave_config returned error %d\n", ret); + spdifrx->ctrl_chan = NULL; + } + + return ret; +}; + +static const char * const spdifrx_enum_input[] = { + "in0", "in1", "in2", "in3" +}; + +/* By default CS bits are retrieved from channel A */ +static const char * const spdifrx_enum_cs_channel[] = { + "A", "B" +}; + +static SOC_ENUM_SINGLE_DECL(ctrl_enum_input, + STM32_SPDIFRX_CR, SPDIFRX_CR_INSEL_SHIFT, + spdifrx_enum_input); + +static SOC_ENUM_SINGLE_DECL(ctrl_enum_cs_channel, + STM32_SPDIFRX_CR, SPDIFRX_CR_CHSEL_SHIFT, + spdifrx_enum_cs_channel); + +static int stm32_spdifrx_info(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_info *uinfo) +{ + uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958; + uinfo->count = 1; + + return 0; +} + +static int stm32_spdifrx_ub_info(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_info *uinfo) +{ + uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958; + uinfo->count = 1; + + return 0; +} + +static int stm32_spdifrx_get_ctrl_data(struct stm32_spdifrx_data *spdifrx) +{ + int ret = 0; + + memset(spdifrx->cs, 0, SPDIFRX_CS_BYTES_NB); + memset(spdifrx->ub, 0, SPDIFRX_UB_BYTES_NB); + + ret = stm32_spdifrx_dma_ctrl_start(spdifrx); + if (ret < 0) + return ret; + + ret = clk_prepare_enable(spdifrx->kclk); + if (ret) { + dev_err(&spdifrx->pdev->dev, "Enable kclk failed: %d\n", ret); + return ret; + } + + ret = regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR, + SPDIFRX_CR_CBDMAEN, SPDIFRX_CR_CBDMAEN); + if (ret < 0) + goto end; + + ret = stm32_spdifrx_start_sync(spdifrx); + if (ret < 0) + goto end; + + if (wait_for_completion_interruptible_timeout(&spdifrx->cs_completion, + msecs_to_jiffies(100)) + <= 0) { + dev_dbg(&spdifrx->pdev->dev, "Failed to get control data\n"); + ret = -EAGAIN; + } + + stm32_spdifrx_stop(spdifrx); + stm32_spdifrx_dma_ctrl_stop(spdifrx); + +end: + clk_disable_unprepare(spdifrx->kclk); + + return ret; +} + +static int stm32_spdifrx_capture_get(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_value *ucontrol) +{ + struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol); + struct stm32_spdifrx_data *spdifrx = snd_soc_dai_get_drvdata(cpu_dai); + + stm32_spdifrx_get_ctrl_data(spdifrx); + + ucontrol->value.iec958.status[0] = spdifrx->cs[0]; + ucontrol->value.iec958.status[1] = spdifrx->cs[1]; + ucontrol->value.iec958.status[2] = spdifrx->cs[2]; + ucontrol->value.iec958.status[3] = spdifrx->cs[3]; + ucontrol->value.iec958.status[4] = spdifrx->cs[4]; + + return 0; +} + +static int stm32_spdif_user_bits_get(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_value *ucontrol) +{ + struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol); + struct stm32_spdifrx_data *spdifrx = snd_soc_dai_get_drvdata(cpu_dai); + + stm32_spdifrx_get_ctrl_data(spdifrx); + + ucontrol->value.iec958.status[0] = spdifrx->ub[0]; + ucontrol->value.iec958.status[1] = spdifrx->ub[1]; + ucontrol->value.iec958.status[2] = spdifrx->ub[2]; + ucontrol->value.iec958.status[3] = spdifrx->ub[3]; + ucontrol->value.iec958.status[4] = spdifrx->ub[4]; + + return 0; +} + +static struct snd_kcontrol_new stm32_spdifrx_iec_ctrls[] = { + /* Channel status control */ + { + .iface = SNDRV_CTL_ELEM_IFACE_PCM, + .name = SNDRV_CTL_NAME_IEC958("", CAPTURE, DEFAULT), + .access = SNDRV_CTL_ELEM_ACCESS_READ | + SNDRV_CTL_ELEM_ACCESS_VOLATILE, + .info = stm32_spdifrx_info, + .get = stm32_spdifrx_capture_get, + }, + /* User bits control */ + { + .iface = SNDRV_CTL_ELEM_IFACE_PCM, + .name = "IEC958 User Bit Capture Default", + .access = SNDRV_CTL_ELEM_ACCESS_READ | + SNDRV_CTL_ELEM_ACCESS_VOLATILE, + .info = stm32_spdifrx_ub_info, + .get = stm32_spdif_user_bits_get, + }, +}; + +static struct snd_kcontrol_new stm32_spdifrx_ctrls[] = { + SOC_ENUM("SPDIFRX input", ctrl_enum_input), + SOC_ENUM("SPDIFRX CS channel", ctrl_enum_cs_channel), +}; + +static int stm32_spdifrx_dai_register_ctrls(struct snd_soc_dai *cpu_dai) +{ + int ret; + + ret = snd_soc_add_dai_controls(cpu_dai, stm32_spdifrx_iec_ctrls, + ARRAY_SIZE(stm32_spdifrx_iec_ctrls)); + if (ret < 0) + return ret; + + return snd_soc_add_component_controls(cpu_dai->component, + stm32_spdifrx_ctrls, + ARRAY_SIZE(stm32_spdifrx_ctrls)); +} + +static int stm32_spdifrx_dai_probe(struct snd_soc_dai *cpu_dai) +{ + struct stm32_spdifrx_data *spdifrx = dev_get_drvdata(cpu_dai->dev); + + spdifrx->dma_params.addr = (dma_addr_t)(spdifrx->phys_addr + + STM32_SPDIFRX_DR); + spdifrx->dma_params.maxburst = 1; + + snd_soc_dai_init_dma_data(cpu_dai, NULL, &spdifrx->dma_params); + + return stm32_spdifrx_dai_register_ctrls(cpu_dai); +} + +static bool stm32_spdifrx_readable_reg(struct device *dev, unsigned int reg) +{ + switch (reg) { + case STM32_SPDIFRX_CR: + case STM32_SPDIFRX_IMR: + case STM32_SPDIFRX_SR: + case STM32_SPDIFRX_IFCR: + case STM32_SPDIFRX_DR: + case STM32_SPDIFRX_CSR: + case STM32_SPDIFRX_DIR: + case STM32_SPDIFRX_VERR: + case STM32_SPDIFRX_IDR: + case STM32_SPDIFRX_SIDR: + return true; + default: + return false; + } +} + +static bool stm32_spdifrx_volatile_reg(struct device *dev, unsigned int reg) +{ + switch (reg) { + case STM32_SPDIFRX_DR: + case STM32_SPDIFRX_CSR: + case STM32_SPDIFRX_SR: + case STM32_SPDIFRX_DIR: + return true; + default: + return false; + } +} + +static bool stm32_spdifrx_writeable_reg(struct device *dev, unsigned int reg) +{ + switch (reg) { + case STM32_SPDIFRX_CR: + case STM32_SPDIFRX_IMR: + case STM32_SPDIFRX_IFCR: + return true; + default: + return false; + } +} + +static const struct regmap_config stm32_h7_spdifrx_regmap_conf = { + .reg_bits = 32, + .reg_stride = 4, + .val_bits = 32, + .max_register = STM32_SPDIFRX_SIDR, + .readable_reg = stm32_spdifrx_readable_reg, + .volatile_reg = stm32_spdifrx_volatile_reg, + .writeable_reg = stm32_spdifrx_writeable_reg, + .num_reg_defaults_raw = STM32_SPDIFRX_SIDR / sizeof(u32) + 1, + .fast_io = true, + .cache_type = REGCACHE_FLAT, +}; + +static irqreturn_t stm32_spdifrx_isr(int irq, void *devid) +{ + struct stm32_spdifrx_data *spdifrx = (struct stm32_spdifrx_data *)devid; + struct platform_device *pdev = spdifrx->pdev; + unsigned int cr, mask, sr, imr; + unsigned int flags, sync_state; + int err = 0, err_xrun = 0; + + regmap_read(spdifrx->regmap, STM32_SPDIFRX_SR, &sr); + regmap_read(spdifrx->regmap, STM32_SPDIFRX_IMR, &imr); + + mask = imr & SPDIFRX_XIMR_MASK; + /* SERR, TERR, FERR IRQs are generated if IFEIE is set */ + if (mask & SPDIFRX_IMR_IFEIE) + mask |= (SPDIFRX_IMR_IFEIE << 1) | (SPDIFRX_IMR_IFEIE << 2); + + flags = sr & mask; + if (!flags) { + dev_err(&pdev->dev, "Unexpected IRQ. rflags=%#x, imr=%#x\n", + sr, imr); + return IRQ_NONE; + } + + /* Clear IRQs */ + regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_IFCR, + SPDIFRX_XIFCR_MASK, flags); + + if (flags & SPDIFRX_SR_PERR) { + dev_dbg(&pdev->dev, "Parity error\n"); + err_xrun = 1; + } + + if (flags & SPDIFRX_SR_OVR) { + dev_dbg(&pdev->dev, "Overrun error\n"); + err_xrun = 1; + } + + if (flags & SPDIFRX_SR_SBD) + dev_dbg(&pdev->dev, "Synchronization block detected\n"); + + if (flags & SPDIFRX_SR_SYNCD) { + dev_dbg(&pdev->dev, "Synchronization done\n"); + + /* Enable spdifrx */ + cr = SPDIFRX_CR_SPDIFENSET(SPDIFRX_SPDIFEN_ENABLE); + regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR, + SPDIFRX_CR_SPDIFEN_MASK, cr); + } + + if (flags & SPDIFRX_SR_FERR) { + dev_dbg(&pdev->dev, "Frame error\n"); + err = 1; + } + + if (flags & SPDIFRX_SR_SERR) { + dev_dbg(&pdev->dev, "Synchronization error\n"); + err = 1; + } + + if (flags & SPDIFRX_SR_TERR) { + dev_dbg(&pdev->dev, "Timeout error\n"); + err = 1; + } + + if (err) { + regmap_read(spdifrx->regmap, STM32_SPDIFRX_CR, &cr); + sync_state = FIELD_GET(SPDIFRX_CR_SPDIFEN_MASK, cr) && + SPDIFRX_SPDIFEN_SYNC; + + /* SPDIFRX is in STATE_STOP. Disable SPDIFRX to clear errors */ + cr = SPDIFRX_CR_SPDIFENSET(SPDIFRX_SPDIFEN_DISABLE); + regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR, + SPDIFRX_CR_SPDIFEN_MASK, cr); + + /* If SPDIFRX was in STATE_SYNC, retry synchro */ + if (sync_state) { + cr = SPDIFRX_CR_SPDIFENSET(SPDIFRX_SPDIFEN_SYNC); + regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR, + SPDIFRX_CR_SPDIFEN_MASK, cr); + return IRQ_HANDLED; + } + + spin_lock(&spdifrx->irq_lock); + if (spdifrx->substream) + snd_pcm_stop(spdifrx->substream, + SNDRV_PCM_STATE_DISCONNECTED); + spin_unlock(&spdifrx->irq_lock); + + return IRQ_HANDLED; + } + + spin_lock(&spdifrx->irq_lock); + if (err_xrun && spdifrx->substream) + snd_pcm_stop_xrun(spdifrx->substream); + spin_unlock(&spdifrx->irq_lock); + + return IRQ_HANDLED; +} + +static int stm32_spdifrx_startup(struct snd_pcm_substream *substream, + struct snd_soc_dai *cpu_dai) +{ + struct stm32_spdifrx_data *spdifrx = snd_soc_dai_get_drvdata(cpu_dai); + unsigned long flags; + int ret; + + spin_lock_irqsave(&spdifrx->irq_lock, flags); + spdifrx->substream = substream; + spin_unlock_irqrestore(&spdifrx->irq_lock, flags); + + ret = clk_prepare_enable(spdifrx->kclk); + if (ret) + dev_err(&spdifrx->pdev->dev, "Enable kclk failed: %d\n", ret); + + return ret; +} + +static int stm32_spdifrx_hw_params(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params, + struct snd_soc_dai *cpu_dai) +{ + struct stm32_spdifrx_data *spdifrx = snd_soc_dai_get_drvdata(cpu_dai); + int data_size = params_width(params); + int fmt; + + switch (data_size) { + case 16: + fmt = SPDIFRX_DRFMT_PACKED; + break; + case 32: + fmt = SPDIFRX_DRFMT_LEFT; + break; + default: + dev_err(&spdifrx->pdev->dev, "Unexpected data format\n"); + return -EINVAL; + } + + /* + * Set buswidth to 4 bytes for all data formats. + * Packed format: transfer 2 x 2 bytes samples + * Left format: transfer 1 x 3 bytes samples + 1 dummy byte + */ + spdifrx->dma_params.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; + snd_soc_dai_init_dma_data(cpu_dai, NULL, &spdifrx->dma_params); + + return regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR, + SPDIFRX_CR_DRFMT_MASK, + SPDIFRX_CR_DRFMTSET(fmt)); +} + +static int stm32_spdifrx_trigger(struct snd_pcm_substream *substream, int cmd, + struct snd_soc_dai *cpu_dai) +{ + struct stm32_spdifrx_data *spdifrx = snd_soc_dai_get_drvdata(cpu_dai); + int ret = 0; + + switch (cmd) { + case SNDRV_PCM_TRIGGER_START: + case SNDRV_PCM_TRIGGER_RESUME: + case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: + regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_IMR, + SPDIFRX_IMR_OVRIE, SPDIFRX_IMR_OVRIE); + + regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR, + SPDIFRX_CR_RXDMAEN, SPDIFRX_CR_RXDMAEN); + + ret = stm32_spdifrx_start_sync(spdifrx); + break; + case SNDRV_PCM_TRIGGER_SUSPEND: + case SNDRV_PCM_TRIGGER_PAUSE_PUSH: + case SNDRV_PCM_TRIGGER_STOP: + stm32_spdifrx_stop(spdifrx); + break; + default: + return -EINVAL; + } + + return ret; +} + +static void stm32_spdifrx_shutdown(struct snd_pcm_substream *substream, + struct snd_soc_dai *cpu_dai) +{ + struct stm32_spdifrx_data *spdifrx = snd_soc_dai_get_drvdata(cpu_dai); + unsigned long flags; + + spin_lock_irqsave(&spdifrx->irq_lock, flags); + spdifrx->substream = NULL; + spin_unlock_irqrestore(&spdifrx->irq_lock, flags); + + clk_disable_unprepare(spdifrx->kclk); +} + +static const struct snd_soc_dai_ops stm32_spdifrx_pcm_dai_ops = { + .startup = stm32_spdifrx_startup, + .hw_params = stm32_spdifrx_hw_params, + .trigger = stm32_spdifrx_trigger, + .shutdown = stm32_spdifrx_shutdown, +}; + +static struct snd_soc_dai_driver stm32_spdifrx_dai[] = { + { + .probe = stm32_spdifrx_dai_probe, + .capture = { + .stream_name = "CPU-Capture", + .channels_min = 1, + .channels_max = 2, + .rates = SNDRV_PCM_RATE_8000_192000, + .formats = SNDRV_PCM_FMTBIT_S32_LE | + SNDRV_PCM_FMTBIT_S16_LE, + }, + .ops = &stm32_spdifrx_pcm_dai_ops, + } +}; + +static const struct snd_pcm_hardware stm32_spdifrx_pcm_hw = { + .info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_MMAP, + .buffer_bytes_max = 8 * PAGE_SIZE, + .period_bytes_min = 1024, + .period_bytes_max = 4 * PAGE_SIZE, + .periods_min = 2, + .periods_max = 8, +}; + +static const struct snd_soc_component_driver stm32_spdifrx_component = { + .name = "stm32-spdifrx", +}; + +static const struct snd_dmaengine_pcm_config stm32_spdifrx_pcm_config = { + .pcm_hardware = &stm32_spdifrx_pcm_hw, + .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config, +}; + +static const struct of_device_id stm32_spdifrx_ids[] = { + { + .compatible = "st,stm32h7-spdifrx", + .data = &stm32_h7_spdifrx_regmap_conf + }, + {} +}; + +static int stm32_spdifrx_parse_of(struct platform_device *pdev, + struct stm32_spdifrx_data *spdifrx) +{ + struct device_node *np = pdev->dev.of_node; + const struct of_device_id *of_id; + struct resource *res; + + if (!np) + return -ENODEV; + + of_id = of_match_device(stm32_spdifrx_ids, &pdev->dev); + if (of_id) + spdifrx->regmap_conf = + (const struct regmap_config *)of_id->data; + else + return -EINVAL; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + spdifrx->base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(spdifrx->base)) + return PTR_ERR(spdifrx->base); + + spdifrx->phys_addr = res->start; + + spdifrx->kclk = devm_clk_get(&pdev->dev, "kclk"); + if (IS_ERR(spdifrx->kclk)) { + if (PTR_ERR(spdifrx->kclk) != -EPROBE_DEFER) + dev_err(&pdev->dev, "Could not get kclk: %ld\n", + PTR_ERR(spdifrx->kclk)); + return PTR_ERR(spdifrx->kclk); + } + + spdifrx->irq = platform_get_irq(pdev, 0); + if (spdifrx->irq < 0) + return spdifrx->irq; + + return 0; +} + +static int stm32_spdifrx_remove(struct platform_device *pdev) +{ + struct stm32_spdifrx_data *spdifrx = platform_get_drvdata(pdev); + + if (spdifrx->ctrl_chan) + dma_release_channel(spdifrx->ctrl_chan); + + if (spdifrx->dmab) + snd_dma_free_pages(spdifrx->dmab); + + snd_dmaengine_pcm_unregister(&pdev->dev); + snd_soc_unregister_component(&pdev->dev); + + return 0; +} + +static int stm32_spdifrx_probe(struct platform_device *pdev) +{ + struct stm32_spdifrx_data *spdifrx; + struct reset_control *rst; + const struct snd_dmaengine_pcm_config *pcm_config = NULL; + u32 ver, idr; + int ret; + + spdifrx = devm_kzalloc(&pdev->dev, sizeof(*spdifrx), GFP_KERNEL); + if (!spdifrx) + return -ENOMEM; + + spdifrx->pdev = pdev; + init_completion(&spdifrx->cs_completion); + spin_lock_init(&spdifrx->lock); + spin_lock_init(&spdifrx->irq_lock); + + platform_set_drvdata(pdev, spdifrx); + + ret = stm32_spdifrx_parse_of(pdev, spdifrx); + if (ret) + return ret; + + spdifrx->regmap = devm_regmap_init_mmio_clk(&pdev->dev, "kclk", + spdifrx->base, + spdifrx->regmap_conf); + if (IS_ERR(spdifrx->regmap)) { + if (PTR_ERR(spdifrx->regmap) != -EPROBE_DEFER) + dev_err(&pdev->dev, "Regmap init error %ld\n", + PTR_ERR(spdifrx->regmap)); + return PTR_ERR(spdifrx->regmap); + } + + ret = devm_request_irq(&pdev->dev, spdifrx->irq, stm32_spdifrx_isr, 0, + dev_name(&pdev->dev), spdifrx); + if (ret) { + dev_err(&pdev->dev, "IRQ request returned %d\n", ret); + return ret; + } + + rst = devm_reset_control_get_optional_exclusive(&pdev->dev, NULL); + if (IS_ERR(rst)) { + if (PTR_ERR(rst) != -EPROBE_DEFER) + dev_err(&pdev->dev, "Reset controller error %ld\n", + PTR_ERR(rst)); + return PTR_ERR(rst); + } + reset_control_assert(rst); + udelay(2); + reset_control_deassert(rst); + + pcm_config = &stm32_spdifrx_pcm_config; + ret = snd_dmaengine_pcm_register(&pdev->dev, pcm_config, 0); + if (ret) { + if (ret != -EPROBE_DEFER) + dev_err(&pdev->dev, "PCM DMA register error %d\n", ret); + return ret; + } + + ret = snd_soc_register_component(&pdev->dev, + &stm32_spdifrx_component, + stm32_spdifrx_dai, + ARRAY_SIZE(stm32_spdifrx_dai)); + if (ret) { + snd_dmaengine_pcm_unregister(&pdev->dev); + return ret; + } + + ret = stm32_spdifrx_dma_ctrl_register(&pdev->dev, spdifrx); + if (ret) + goto error; + + ret = regmap_read(spdifrx->regmap, STM32_SPDIFRX_IDR, &idr); + if (ret) + goto error; + + if (idr == SPDIFRX_IPIDR_NUMBER) { + ret = regmap_read(spdifrx->regmap, STM32_SPDIFRX_VERR, &ver); + if (ret) + goto error; + + dev_dbg(&pdev->dev, "SPDIFRX version: %lu.%lu registered\n", + FIELD_GET(SPDIFRX_VERR_MAJ_MASK, ver), + FIELD_GET(SPDIFRX_VERR_MIN_MASK, ver)); + } + + return ret; + +error: + stm32_spdifrx_remove(pdev); + + return ret; +} + +MODULE_DEVICE_TABLE(of, stm32_spdifrx_ids); + +#ifdef CONFIG_PM_SLEEP +static int stm32_spdifrx_suspend(struct device *dev) +{ + struct stm32_spdifrx_data *spdifrx = dev_get_drvdata(dev); + + regcache_cache_only(spdifrx->regmap, true); + regcache_mark_dirty(spdifrx->regmap); + + return 0; +} + +static int stm32_spdifrx_resume(struct device *dev) +{ + struct stm32_spdifrx_data *spdifrx = dev_get_drvdata(dev); + + regcache_cache_only(spdifrx->regmap, false); + + return regcache_sync(spdifrx->regmap); +} +#endif /* CONFIG_PM_SLEEP */ + +static const struct dev_pm_ops stm32_spdifrx_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(stm32_spdifrx_suspend, stm32_spdifrx_resume) +}; + +static struct platform_driver stm32_spdifrx_driver = { + .driver = { + .name = "st,stm32-spdifrx", + .of_match_table = stm32_spdifrx_ids, + .pm = &stm32_spdifrx_pm_ops, + }, + .probe = stm32_spdifrx_probe, + .remove = stm32_spdifrx_remove, +}; + +module_platform_driver(stm32_spdifrx_driver); + +MODULE_DESCRIPTION("STM32 Soc spdifrx Interface"); +MODULE_AUTHOR("Olivier Moysan, <olivier.moysan@st.com>"); +MODULE_ALIAS("platform:stm32-spdifrx"); +MODULE_LICENSE("GPL v2"); |