Add I2S ASoC driver for STM32. This version of the driver supports only exclusive playback and capture interface.
Signed-off-by: olivier moysan olivier.moysan@st.com --- sound/soc/stm/Kconfig | 2 +- sound/soc/stm/Makefile | 4 + sound/soc/stm/stm32_i2s.c | 941 ++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 946 insertions(+), 1 deletion(-) create mode 100644 sound/soc/stm/stm32_i2s.c
diff --git a/sound/soc/stm/Kconfig b/sound/soc/stm/Kconfig index 972970f..a6372de 100644 --- a/sound/soc/stm/Kconfig +++ b/sound/soc/stm/Kconfig @@ -5,4 +5,4 @@ menuconfig SND_SOC_STM32 select SND_SOC_GENERIC_DMAENGINE_PCM select REGMAP_MMIO help - Say Y if you want to enable ASoC-support for STM32 + Say Y if you want to enable ASoC support for STM32 diff --git a/sound/soc/stm/Makefile b/sound/soc/stm/Makefile index e466a47..8251931 100644 --- a/sound/soc/stm/Makefile +++ b/sound/soc/stm/Makefile @@ -4,3 +4,7 @@ obj-$(CONFIG_SND_SOC_STM32) += snd-soc-stm32-sai-sub.o
snd-soc-stm32-sai-objs := stm32_sai.o obj-$(CONFIG_SND_SOC_STM32) += snd-soc-stm32-sai.o + +# I2S +snd-soc-stm32-i2s-objs := stm32_i2s.o +obj-$(CONFIG_SND_SOC_STM32) += snd-soc-stm32-i2s.o diff --git a/sound/soc/stm/stm32_i2s.c b/sound/soc/stm/stm32_i2s.c new file mode 100644 index 0000000..22152a1 --- /dev/null +++ b/sound/soc/stm/stm32_i2s.c @@ -0,0 +1,941 @@ +/* + * 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. + * + * 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/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 + +/* 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) + +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_DAI_NAME_SIZE 20 +#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) + +/** + * @regmap_conf: I2S register map configuration pointer + * @egmap: 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 + * @dais_name: DAI name + * @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 */ + char dais_name[STM32_I2S_DAI_NAME_SIZE]; + 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_update_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"); + + if (err) + snd_pcm_stop_xrun(i2s->substream); + + 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_IFCR_REG: + case STM32_I2S_TXDR_REG: + case STM32_I2S_RXDR_REG: + case STM32_I2S_CGFR_REG: + return true; + default: + return false; + } +} + +static bool stm32_i2s_volatile_reg(struct device *dev, unsigned int reg) +{ + switch (reg) { + case STM32_I2S_TXDR_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, cfg1_mask; + bool playback_flg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK); + unsigned int fthlv; + int ret; + + if ((params_channels(params) == 1) && + ((i2s->fmt & SND_SOC_DAIFMT_FORMAT_MASK) != SND_SOC_DAIFMT_DSP_A)) { + dev_err(cpu_dai->dev, "Mono mode supported only by DSP_A\n"); + return -EINVAL; + } + + switch (format) { + case 16: + cfgr = I2S_CGFR_DATLEN_SET(I2S_I2SMOD_DATLEN_16); + cfgr_mask = I2S_CGFR_DATLEN_MASK; + 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)) { + if (playback_flg) + cfgr |= I2S_CGFR_I2SCFG_SET(I2S_I2SMOD_TX_SLAVE); + else + cfgr |= I2S_CGFR_I2SCFG_SET(I2S_I2SMOD_RX_SLAVE); + + /* As data length is either 16 or 32 bits, fixch always set */ + cfgr |= I2S_CGFR_FIXCH; + cfgr_mask |= I2S_CGFR_FIXCH; + } else { + if (playback_flg) + cfgr |= I2S_CGFR_I2SCFG_SET(I2S_I2SMOD_TX_MASTER); + else + cfgr |= I2S_CGFR_I2SCFG_SET(I2S_I2SMOD_RX_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; + + cfg1 = I2S_CFG1_RXDMAEN; + if (playback_flg) + cfg1 = I2S_CFG1_TXDMAEN; + cfg1_mask = cfg1; + + fthlv = STM32_I2S_FIFO_SIZE * I2S_FIFO_TH_ONE_QUARTER / 4; + cfg1 |= I2S_CFG1_FTHVL_SET(fthlv - 1); + cfg1_mask |= I2S_CFG1_FTHVL_MASK; + + return regmap_update_bits(i2s->regmap, STM32_I2S_CFG1_REG, + cfg1_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); + int ret, ier; + + i2s->substream = substream; + + spin_lock(&i2s->lock_fd); + if (i2s->refcount) { + dev_err(cpu_dai->dev, "%s stream already started\n", + (substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? + "Capture" : "Playback")); + spin_unlock(&i2s->lock_fd); + return -EBUSY; + } + i2s->refcount = 1; + spin_unlock(&i2s->lock_fd); + + ret = regmap_update_bits(i2s->regmap, STM32_I2S_IFCR_REG, + I2S_IFCR_MASK, I2S_IFCR_MASK); + if (ret < 0) + return ret; + + /* Enable ITs */ + ier = I2S_IER_OVRIE | I2S_IER_UDRIE; + if (STM32_I2S_IS_SLAVE(i2s)) + ier |= I2S_IER_TIFREIE; + + return regmap_update_bits(i2s->regmap, STM32_I2S_IER_REG, ier, ier); +} + +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; + 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\n"); + + 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_update_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; + } + break; + case SNDRV_PCM_TRIGGER_STOP: + case SNDRV_PCM_TRIGGER_SUSPEND: + case SNDRV_PCM_TRIGGER_PAUSE_PUSH: + dev_dbg(cpu_dai->dev, "stop I2S\n"); + + 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); + return ret; + } + + cfg1_mask = I2S_CFG1_RXDMAEN; + if (playback_flg) + cfg1_mask = 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); + + i2s->substream = NULL; + + spin_lock(&i2s->lock_fd); + i2s->refcount = 0; + spin_unlock(&i2s->lock_fd); + + regmap_update_bits(i2s->regmap, STM32_I2S_CGFR_REG, + I2S_CGFR_MCKOE, (unsigned int)~I2S_CGFR_MCKOE); +} + +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_CGFR_REG, + .readable_reg = stm32_i2s_readable_reg, + .volatile_reg = stm32_i2s_volatile_reg, + .writeable_reg = stm32_i2s_writeable_reg, + .fast_io = true, +}; + +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_max = 2048, + .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; + + snprintf(i2s->dais_name, STM32_I2S_DAI_NAME_SIZE, + "%s", dev_name(&pdev->dev)); + + dai_ptr->probe = stm32_i2s_dai_probe; + dai_ptr->ops = &stm32_i2s_pcm_dai_ops; + dai_ptr->name = i2s->dais_name; + 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) { + dev_err(&pdev->dev, "no irq for node %s\n", pdev->name); + return -ENOENT; + } + + 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(&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; + 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); + platform_set_drvdata(pdev, i2s); + + ret = stm32_i2s_dais_init(pdev, i2s); + if (ret) + return ret; + + i2s->regmap = devm_regmap_init_mmio(&pdev->dev, i2s->base, + i2s->regmap_conf); + if (IS_ERR(i2s->regmap)) { + dev_err(&pdev->dev, "regmap init failed\n"); + return PTR_ERR(i2s->regmap); + } + + ret = clk_prepare_enable(i2s->pclk); + if (ret) { + dev_err(&pdev->dev, "Enable pclk failed: %d\n", ret); + return ret; + } + + ret = clk_prepare_enable(i2s->i2sclk); + if (ret) { + dev_err(&pdev->dev, "Enable i2sclk failed: %d\n", ret); + goto err_pclk_disable; + } + + ret = devm_snd_soc_register_component(&pdev->dev, &stm32_i2s_component, + i2s->dai_drv, 1); + if (ret) + goto err_clocks_disable; + + ret = devm_snd_dmaengine_pcm_register(&pdev->dev, + &stm32_i2s_pcm_config, 0); + if (ret) + goto err_clocks_disable; + + /* 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 err_clocks_disable; + + return ret; + +err_clocks_disable: + clk_disable_unprepare(i2s->i2sclk); +err_pclk_disable: + clk_disable_unprepare(i2s->pclk); + + return ret; +} + +static int stm32_i2s_remove(struct platform_device *pdev) +{ + struct stm32_i2s_data *i2s = platform_get_drvdata(pdev); + + clk_disable_unprepare(i2s->i2sclk); + clk_disable_unprepare(i2s->pclk); + + return 0; +} + +MODULE_DEVICE_TABLE(of, stm32_i2s_ids); + +static struct platform_driver stm32_i2s_driver = { + .driver = { + .name = "st,stm32-i2s", + .of_match_table = stm32_i2s_ids, + }, + .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");