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");

This patch allows to use i2s interface either as single audio path (rx or tx), or bidirectional audio path. This patch is added separately, as the driver does not follow recommended use of the interface, to support this configuration.

Signed-off-by: olivier moysan olivier.moysan@st.com --- sound/soc/stm/stm32_i2s.c | 88 +++++++++++++++++++++++++---------------------- 1 file changed, 47 insertions(+), 41 deletions(-)

diff --git a/sound/soc/stm/stm32_i2s.c b/sound/soc/stm/stm32_i2s.c index 22152a1..a8e03c5 100644 --- a/sound/soc/stm/stm32_i2s.c +++ b/sound/soc/stm/stm32_i2s.c @@ -489,7 +489,6 @@ static int stm32_i2s_configure(struct snd_soc_dai *cpu_dai, 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;

@@ -515,19 +514,13 @@ static int stm32_i2s_configure(struct snd_soc_dai *cpu_dai, }

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); + 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 { - if (playback_flg) - cfgr |= I2S_CGFR_I2SCFG_SET(I2S_I2SMOD_TX_MASTER); - else - cfgr |= I2S_CGFR_I2SCFG_SET(I2S_I2SMOD_RX_MASTER); + cfgr |= I2S_CGFR_I2SCFG_SET(I2S_I2SMOD_FD_MASTER); } cfgr_mask |= I2S_CGFR_I2SCFG_MASK;

@@ -536,9 +529,7 @@ static int stm32_i2s_configure(struct snd_soc_dai *cpu_dai, if (ret < 0) return ret;

- cfg1 = I2S_CFG1_RXDMAEN; - if (playback_flg) - cfg1 = I2S_CFG1_TXDMAEN; + cfg1 = I2S_CFG1_RXDMAEN | I2S_CFG1_TXDMAEN; cfg1_mask = cfg1;

fthlv = STM32_I2S_FIFO_SIZE * I2S_FIFO_TH_ONE_QUARTER / 4; @@ -553,32 +544,15 @@ 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; + i2s->refcount++; 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); + return regmap_update_bits(i2s->regmap, STM32_I2S_IFCR_REG, + I2S_IFCR_MASK, I2S_IFCR_MASK); }

static int stm32_i2s_hw_params(struct snd_pcm_substream *substream, @@ -605,9 +579,11 @@ static int stm32_i2s_trigger(struct snd_pcm_substream *substream, int cmd, { struct stm32_i2s_data *i2s = snd_soc_dai_get_drvdata(cpu_dai); bool playback_flg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK); - u32 cfg1_mask; + u32 cfg1_mask, ier; int ret;

+ spin_lock(&i2s->lock_fd); + switch (cmd) { case SNDRV_PCM_TRIGGER_START: case SNDRV_PCM_TRIGGER_RESUME: @@ -628,10 +604,45 @@ static int stm32_i2s_trigger(struct snd_pcm_substream *substream, int cmd, dev_err(cpu_dai->dev, "Error %d starting I2S\n", ret); return ret; } + + regmap_update_bits(i2s->regmap, STM32_I2S_IFCR_REG, + I2S_IFCR_MASK, I2S_IFCR_MASK); + + if (playback_flg) { + ier = I2S_IER_UDRIE; + } else { + ier = I2S_IER_OVRIE; + + if (i2s->refcount == 1) { + /* dummy write to trigger capture */ + ret = regmap_write(i2s->regmap, + STM32_I2S_TXDR_REG, 0); + if (ret) + return ret; + } + } + + 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: + 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); + + i2s->refcount--; + if (i2s->refcount) + break; + dev_dbg(cpu_dai->dev, "stop I2S\n");

ret = regmap_update_bits(i2s->regmap, STM32_I2S_CR1_REG, @@ -641,10 +652,7 @@ static int stm32_i2s_trigger(struct snd_pcm_substream *substream, int cmd, return ret; }

- cfg1_mask = I2S_CFG1_RXDMAEN; - if (playback_flg) - cfg1_mask = I2S_CFG1_TXDMAEN; - + cfg1_mask = I2S_CFG1_RXDMAEN | I2S_CFG1_TXDMAEN; regmap_update_bits(i2s->regmap, STM32_I2S_CFG1_REG, cfg1_mask, 0); break; @@ -652,6 +660,8 @@ static int stm32_i2s_trigger(struct snd_pcm_substream *substream, int cmd, return -EINVAL; }

+ spin_unlock(&i2s->lock_fd); + return 0; }

@@ -662,10 +672,6 @@ static void stm32_i2s_shutdown(struct snd_pcm_substream *substream,

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); }