diff options
Diffstat (limited to 'sound/soc/stm/stm32_sai_sub.c')
| -rw-r--r-- | sound/soc/stm/stm32_sai_sub.c | 1301 |
1 files changed, 1301 insertions, 0 deletions
diff --git a/sound/soc/stm/stm32_sai_sub.c b/sound/soc/stm/stm32_sai_sub.c new file mode 100644 index 000000000..6c2e69e32 --- /dev/null +++ b/sound/soc/stm/stm32_sai_sub.c @@ -0,0 +1,1301 @@ +/* + * 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. + * + * License terms: GPL V2.0. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published by + * the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more + * details. + */ + +#include <linux/clk.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of_irq.h> +#include <linux/of_platform.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_FIFO_SIZE 8 +#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) +#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 + +/** + * 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 + * @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 + */ +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; + 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 */ +}; + +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: + 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_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 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, +}; + +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, +}; + +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, +}; + +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; + + regmap_read(sai->regmap, STM_SAI_IMR_REGX, &imr); + regmap_read(sai->regmap, STM_SAI_SR_REGX, &sr); + + flags = sr & imr; + if (!flags) + return IRQ_NONE; + + regmap_update_bits(sai->regmap, 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; + } + + if (status != SNDRV_PCM_STATE_RUNNING) + snd_pcm_stop_xrun(sai->substream); + + 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->master) { + ret = regmap_update_bits(sai->regmap, STM_SAI_CR1_REGX, + SAI_XCR1_NODIV, + (unsigned int)~SAI_XCR1_NODIV); + if (ret < 0) + return ret; + + sai->mclk_rate = freq; + dev_dbg(cpu_dai->dev, "SAI MCLK frequency is %uHz\n", 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; + + regmap_update_bits(sai->regmap, 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; + + regmap_update_bits(sai->regmap, 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 = regmap_update_bits(sai->regmap, 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; + + sai->substream = substream; + + 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 */ + + regmap_update_bits(sai->regmap, STM_SAI_CLRFR_REGX, + SAI_XCLRFR_MASK, SAI_XCLRFR_MASK); + + imr = SAI_XIMR_OVRUDRIE; + if (STM_SAI_IS_CAPTURE(sai)) { + regmap_read(sai->regmap, 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; + + regmap_update_bits(sai->regmap, 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. + */ + regmap_update_bits(sai->regmap, 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"); + return -EINVAL; + } + + cr1_mask |= SAI_XCR1_MONO; + if ((sai->slots == 2) && (params_channels(params) == 1)) + cr1 |= SAI_XCR1_MONO; + + ret = regmap_update_bits(sai->regmap, 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; + + regmap_read(sai->regmap, 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*/ + regmap_update_bits(sai->regmap, 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; + regmap_update_bits(sai->regmap, + 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); + + regmap_update_bits(sai->regmap, 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; + + regmap_update_bits(sai->regmap, 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 cr1, mask, div = 0; + int sai_clk_rate, mclk_ratio, den, ret; + int version = sai->pdata->conf->version; + unsigned int rate = params_rate(params); + + if (!sai->mclk_rate) { + dev_err(cpu_dai->dev, "Mclk rate is null\n"); + return -EINVAL; + } + + if (!(rate % 11025)) + clk_set_parent(sai->sai_ck, sai->pdata->clk_x11k); + else + clk_set_parent(sai->sai_ck, sai->pdata->clk_x8k); + sai_clk_rate = clk_get_rate(sai->sai_ck); + + if (STM_SAI_IS_F4(sai->pdata)) { + /* + * mclk_rate = 256 * fs + * MCKDIV = 0 if sai_ck < 3/2 * mclk_rate + * MCKDIV = sai_ck / (2 * mclk_rate) otherwise + */ + if (2 * sai_clk_rate >= 3 * sai->mclk_rate) + div = DIV_ROUND_CLOSEST(sai_clk_rate, + 2 * sai->mclk_rate); + } 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 = DIV_ROUND_CLOSEST(sai_clk_rate, + (params_rate(params) * 128)); + } else { + if (sai->mclk_rate) { + mclk_ratio = sai->mclk_rate / rate; + if (mclk_ratio == 512) { + mask = SAI_XCR1_OSR; + cr1 = SAI_XCR1_OSR; + } else if (mclk_ratio != 256) { + dev_err(cpu_dai->dev, + "Wrong mclk ratio %d\n", + mclk_ratio); + return -EINVAL; + } + div = DIV_ROUND_CLOSEST(sai_clk_rate, + sai->mclk_rate); + } else { + /* mclk-fs not set, master clock not active */ + den = sai->fs_length * params_rate(params); + div = DIV_ROUND_CLOSEST(sai_clk_rate, den); + } + } + } + + if (div > SAI_XCR1_MCKDIV_MAX(version)) { + dev_err(cpu_dai->dev, "Divider %d out of range\n", div); + return -EINVAL; + } + dev_dbg(cpu_dai->dev, "SAI clock %d, divider %d\n", sai_clk_rate, div); + + mask = SAI_XCR1_MCKDIV_MASK(SAI_XCR1_MCKDIV_WIDTH(version)); + cr1 = SAI_XCR1_MCKDIV_SET(div); + ret = regmap_update_bits(sai->regmap, STM_SAI_CR1_REGX, mask, cr1); + if (ret < 0) { + dev_err(cpu_dai->dev, "Failed to update CR1 register\n"); + return ret; + } + + return 0; +} + +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"); + + regmap_update_bits(sai->regmap, STM_SAI_CR1_REGX, + SAI_XCR1_DMAEN, SAI_XCR1_DMAEN); + + /* Enable SAI */ + ret = regmap_update_bits(sai->regmap, 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"); + + regmap_update_bits(sai->regmap, STM_SAI_IMR_REGX, + SAI_XIMR_MASK, 0); + + regmap_update_bits(sai->regmap, STM_SAI_CR1_REGX, + SAI_XCR1_SAIEN, + (unsigned int)~SAI_XCR1_SAIEN); + + ret = regmap_update_bits(sai->regmap, 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); + + regmap_update_bits(sai->regmap, STM_SAI_IMR_REGX, SAI_XIMR_MASK, 0); + + regmap_update_bits(sai->regmap, STM_SAI_CR1_REGX, SAI_XCR1_NODIV, + SAI_XCR1_NODIV); + + clk_disable_unprepare(sai->sai_ck); + sai->substream = NULL; +} + +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; + + 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; + /* 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 */ + sai->pdata->set_sync(sai->pdata, sai->np_sync_provider, + sai->synco, sai->synci); + } + + cr1_mask |= SAI_XCR1_SYNCEN_MASK; + cr1 |= SAI_XCR1_SYNCEN_SET(sai->sync); + + return regmap_update_bits(sai->regmap, 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 = substream->private_data; + struct snd_soc_dai *cpu_dai = rtd->cpu_dai; + 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 H7 sub-block B */ + if (STM_SAI_IS_H7(sai->pdata) && STM_SAI_IS_SUB_A(sai)) + sai->regmap_config = &stm32_sai_sub_regmap_config_h7; + + sai->regmap = devm_regmap_init_mmio_clk(&pdev->dev, "sai_ck", + base, sai->regmap_config); + if (IS_ERR(sai->regmap)) { + dev_err(&pdev->dev, "Failed to initialize MMIO\n"); + 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, "%s sync own reference\n", + np->name); + 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, "%s parent node not found\n", + np->name); + 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)) { + dev_err(&pdev->dev, "Missing kernel clock sai_ck\n"); + return PTR_ERR(sai->sai_ck); + } + + return 0; +} + +static int stm32_sai_sub_dais_init(struct platform_device *pdev, + struct stm32_sai_sub_data *sai) +{ + sai->cpu_dai_drv = devm_kzalloc(&pdev->dev, + sizeof(struct snd_soc_dai_driver), + GFP_KERNEL); + if (!sai->cpu_dai_drv) + return -ENOMEM; + + if (STM_SAI_IS_PLAYBACK(sai)) { + memcpy(sai->cpu_dai_drv, &stm32_sai_playback_dai, + sizeof(stm32_sai_playback_dai)); + sai->cpu_dai_drv->playback.stream_name = sai->cpu_dai_drv->name; + } else { + memcpy(sai->cpu_dai_drv, &stm32_sai_capture_dai, + sizeof(stm32_sai_capture_dai)); + sai->cpu_dai_drv->capture.stream_name = sai->cpu_dai_drv->name; + } + sai->cpu_dai_drv->name = dev_name(&pdev->dev); + + 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); + 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; + + ret = stm32_sai_sub_dais_init(pdev, sai); + if (ret) + return ret; + + 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; + } + + ret = devm_snd_soc_register_component(&pdev->dev, &stm32_component, + sai->cpu_dai_drv, 1); + if (ret) + return ret; + + if (STM_SAI_PROTOCOL_IS_SPDIF(sai)) + conf = &stm32_sai_pcm_config_spdif; + + ret = devm_snd_dmaengine_pcm_register(&pdev->dev, conf, 0); + if (ret) { + dev_err(&pdev->dev, "Could not register pcm dma\n"); + return ret; + } + + return 0; +} + +static struct platform_driver stm32_sai_sub_driver = { + .driver = { + .name = "st,stm32-sai-sub", + .of_match_table = stm32_sai_sub_ids, + }, + .probe = stm32_sai_sub_probe, +}; + +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"); |