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Date:   Thu, 11 May 2017 11:45:03 +0200
From:   olivier moysan <olivier.moysan@...com>
To:     <lgirdwood@...il.com>, <broonie@...nel.org>, <perex@...ex.cz>,
        <tiwai@...e.com>, <mcoquelin.stm32@...il.com>,
        <alexandre.torgue@...com>, <alsa-devel@...a-project.org>,
        <robh@...nel.org>, <mark.rutland@....com>,
        <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <kernel@...inux.com>,
        <linux-kernel@...r.kernel.org>, <olivier.moysan@...com>
CC:     <arnaud.pouliquen@...com>, <benjamin.gaignard@...com>
Subject: [PATCH v3 2/3] ASoC: stm32: Add I2S driver

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@...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@...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@...com>");
+MODULE_ALIAS("platform:stm32-i2s");
+MODULE_LICENSE("GPL v2");
-- 
1.9.1

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