/* * STM32 ALSA SoC Digital Audio Interface (SAI) driver. * * Copyright (C) 2016, STMicroelectronics - All Rights Reserved * Author(s): Olivier Moysan 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 #include #include #include #include #include #include #include #include #include "stm32_sai.h" #define SAI_FREE_PROTOCOL 0x0 #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") /** * 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 * @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 * @fmt: SAI block format. relevant only for custom protocols. set at init * @sync: SAI block synchronization mode. (none, internal or external) * @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. */ 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 clk *sai_ck; dma_addr_t phys_addr; unsigned int mclk_rate; unsigned int id; int dir; bool master; int fmt; int sync; int fs_length; int slots; int slot_width; int slot_mask; int data_size; }; 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 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_stream_lock(sai->substream); snd_pcm_stop(sai->substream, SNDRV_PCM_STATE_XRUN); snd_pcm_stream_unlock(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; 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); cr1_mask = SAI_XCR1_PRTCFG_MASK; 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; } cr1_mask |= SAI_XCR1_SLAVE; /* do not generate master by default */ cr1 |= SAI_XCR1_NODIV; cr1_mask |= SAI_XCR1_NODIV; 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; 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)); /* 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 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; if (!sai->mclk_rate) { dev_err(cpu_dai->dev, "Mclk rate is null\n"); return -EINVAL; } if (!(params_rate(params) % 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 (sai->mclk_rate) { mclk_ratio = sai->mclk_rate / params_rate(params); if (mclk_ratio != 256) { if (mclk_ratio == 512) { mask = SAI_XCR1_OSR; cr1 = SAI_XCR1_OSR; } else { 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. NOMCK=1 */ 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); 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"); 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_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); cr1_mask = SAI_XCR1_RX_TX; if (STM_SAI_IS_CAPTURE(sai)) cr1 |= SAI_XCR1_RX_TX; 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 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, .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_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; 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; } 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; sai->cpu_dai_drv->name = dev_name(&pdev->dev); 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; } 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; 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; 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; ret = devm_snd_dmaengine_pcm_register(&pdev->dev, &stm32_sai_pcm_config, 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 "); MODULE_ALIAS("platform:st,stm32-sai-sub"); MODULE_LICENSE("GPL v2");