| // 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)) { |
| dev_err(&pdev->dev, "Could not get pclk\n"); |
| return PTR_ERR(i2s->pclk); |
| } |
| |
| i2s->i2sclk = devm_clk_get(&pdev->dev, "i2sclk"); |
| if (IS_ERR(i2s->i2sclk)) { |
| dev_err(&pdev->dev, "Could not get i2sclk\n"); |
| return PTR_ERR(i2s->i2sclk); |
| } |
| |
| i2s->x8kclk = devm_clk_get(&pdev->dev, "x8k"); |
| if (IS_ERR(i2s->x8kclk)) { |
| dev_err(&pdev->dev, "missing x8k parent clock\n"); |
| return PTR_ERR(i2s->x8kclk); |
| } |
| |
| i2s->x11kclk = devm_clk_get(&pdev->dev, "x11k"); |
| if (IS_ERR(i2s->x11kclk)) { |
| dev_err(&pdev->dev, "missing x11k parent clock\n"); |
| return PTR_ERR(i2s->x11kclk); |
| } |
| |
| /* Get irqs */ |
| irq = platform_get_irq(pdev, 0); |
| if (irq < 0) { |
| if (irq != -EPROBE_DEFER) |
| dev_err(&pdev->dev, "no irq for node %s\n", pdev->name); |
| 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_exclusive(&pdev->dev, NULL); |
| if (!IS_ERR(rst)) { |
| reset_control_assert(rst); |
| udelay(2); |
| reset_control_deassert(rst); |
| } |
| |
| 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)) { |
| dev_err(&pdev->dev, "regmap init failed\n"); |
| return PTR_ERR(i2s->regmap); |
| } |
| |
| ret = devm_snd_soc_register_component(&pdev->dev, &stm32_i2s_component, |
| i2s->dai_drv, 1); |
| if (ret) |
| return ret; |
| |
| ret = devm_snd_dmaengine_pcm_register(&pdev->dev, |
| &stm32_i2s_pcm_config, 0); |
| if (ret) |
| 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) |
| return ret; |
| |
| ret = regmap_read(i2s->regmap, STM32_I2S_IPIDR_REG, &val); |
| if (ret) |
| return ret; |
| |
| if (val == I2S_IPIDR_NUMBER) { |
| ret = regmap_read(i2s->regmap, STM32_I2S_HWCFGR_REG, &val); |
| if (ret) |
| return ret; |
| |
| if (!FIELD_GET(I2S_HWCFGR_I2S_SUPPORT_MASK, val)) { |
| dev_err(&pdev->dev, |
| "Device does not support i2s mode\n"); |
| return -EPERM; |
| } |
| |
| ret = regmap_read(i2s->regmap, STM32_I2S_VERR_REG, &val); |
| |
| 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; |
| } |
| |
| 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, |
| }; |
| |
| 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"); |