[PATCH 2/2] ASoC: stm32: Add I2S driver

olivier moysan
2017-04-06T15:40:36Z

Add I2S ASoC driver for STM32.

Signed-off-by: olivier moysan <olivier.moysan@st.com>
---
sound/soc/Kconfig | 1 +
sound/soc/Makefile | 1 +
sound/soc/stm/Kconfig | 8 +
sound/soc/stm/Makefile | 2 +
sound/soc/stm/stm32_i2s.c | 1069 +++++++++++++++++++++++++++++++++++++++++++++
5 files changed, 1081 insertions(+)
create mode 100644 sound/soc/stm/Kconfig
create mode 100644 sound/soc/stm/Makefile
create mode 100644 sound/soc/stm/stm32_i2s.c

diff --git a/sound/soc/Kconfig b/sound/soc/Kconfig
index 182d92e..3836ebe 100644
--- a/sound/soc/Kconfig
+++ b/sound/soc/Kconfig
@@ -63,6 +63,7 @@ source "sound/soc/sh/Kconfig"
source "sound/soc/sirf/Kconfig"
source "sound/soc/spear/Kconfig"
source "sound/soc/sti/Kconfig"
+source "sound/soc/stm/Kconfig"
source "sound/soc/sunxi/Kconfig"
source "sound/soc/tegra/Kconfig"
source "sound/soc/txx9/Kconfig"
diff --git a/sound/soc/Makefile b/sound/soc/Makefile
index 9a30f21..5440cf7 100644
--- a/sound/soc/Makefile
+++ b/sound/soc/Makefile
@@ -43,6 +43,7 @@ obj-$(CONFIG_SND_SOC) += sh/
obj-$(CONFIG_SND_SOC) += sirf/
obj-$(CONFIG_SND_SOC) += spear/
obj-$(CONFIG_SND_SOC) += sti/
+obj-$(CONFIG_SND_SOC) += stm/
obj-$(CONFIG_SND_SOC) += sunxi/
obj-$(CONFIG_SND_SOC) += tegra/
obj-$(CONFIG_SND_SOC) += txx9/
diff --git a/sound/soc/stm/Kconfig b/sound/soc/stm/Kconfig
new file mode 100644
index 0000000..972970f
--- /dev/null
+++ b/sound/soc/stm/Kconfig
@@ -0,0 +1,8 @@
+menuconfig SND_SOC_STM32
+ tristate "STMicroelectronics STM32 SOC audio support"
+ depends on ARCH_STM32 || COMPILE_TEST
+ depends on SND_SOC
+ select SND_SOC_GENERIC_DMAENGINE_PCM
+ select REGMAP_MMIO
+ help
+ Say Y if you want to enable ASoC-support for STM32
diff --git a/sound/soc/stm/Makefile b/sound/soc/stm/Makefile
new file mode 100644
index 0000000..090836b
--- /dev/null
+++ b/sound/soc/stm/Makefile
@@ -0,0 +1,2 @@
+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..2ca9719
--- /dev/null
+++ b/sound/soc/stm/stm32_i2s.c
@@ -0,0 +1,1069 @@
+/*
+ * 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_dir {
+ I2S_DIR_TX,
+ I2S_DIR_RX,
+ I2S_DIR_FD,
+};
+
+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_DAIS_NB 3
+#define STM32_I2S_IP_NAME_LENGTH 5
+#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)
+
+#define STM32_I2S_IS_PLAYBACK(x) ((x)->dir == I2S_DIR_TX)
+#define STM32_I2S_IS_CAPTURE(x) ((x)->dir == I2S_DIR_RX)
+#define STM32_I2S_IS_FULL_DUPLEX(x) ((x)->dir == I2S_DIR_FD)
+
+/**
+ * @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
+ * @ip_name: I2S name
+ * @dais_name: playback, capture and fd DAI names
+ * @fifo_th: fifo threshold setting
+ * @mclk_rate: master clock frequency (Hz)
+ * @fmt: DAI protocol
+ * @refcount: keep count of opened streams on I2S
+ * @startcount: keep count of started streams on I2S
+ * @dir: I2S direction. tx, rx or full duplex.
+ * @ms_flg: master mode flag.
+ * @format: pcm stream width (16/32 bits), used for consistency check in fd mode
+ * @rate: pcm stream rate, used for consistency check in fd mode
+ */
+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 */
+ const char *ip_name;
+ char dais_name[STM32_I2S_DAIS_NB][STM32_I2S_DAI_NAME_SIZE];
+ unsigned int fifo_th;
+ unsigned int mclk_rate;
+ unsigned int fmt;
+ int refcount;
+ int startcount;
+ int dir;
+ int ms_flg;
+ int format;
+ unsigned int rate;
+};
+
+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 IT sr=0x%08x, ier=0x%08x\n",
+ sr, ier);
+ return IRQ_NONE;
+ }
+
+ /* Clear ITs */
+ regmap_update_bits(i2s->regmap, STM32_I2S_IFCR_REG,
+ I2S_IFCR_MASK, flags);
+
+ if (flags & I2S_SR_OVR) {
+ dev_dbg(&pdev->dev, "Overrun: received value discarded\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:
+ if (STM32_I2S_IS_MASTER(i2s)) {
+ dev_err(cpu_dai->dev, "previous DAI set master mode\n");
+ return -EINVAL;
+ }
+ i2s->ms_flg = I2S_MS_SLAVE;
+
+ if (STM32_I2S_IS_FULL_DUPLEX(i2s))
+ cgfr |= I2S_CGFR_I2SCFG_SET(I2S_I2SMOD_FD_SLAVE);
+ else if (STM32_I2S_IS_PLAYBACK(i2s))
+ cgfr |= I2S_CGFR_I2SCFG_SET(I2S_I2SMOD_TX_SLAVE);
+ else
+ cgfr |= I2S_CGFR_I2SCFG_SET(I2S_I2SMOD_RX_SLAVE);
+ break;
+ case SND_SOC_DAIFMT_CBS_CFS:
+ if (STM32_I2S_IS_SLAVE(i2s)) {
+ dev_err(cpu_dai->dev, "previous DAI set slave mode\n");
+ return -EINVAL;
+ }
+ i2s->ms_flg = I2S_MS_MASTER;
+
+ if (STM32_I2S_IS_FULL_DUPLEX(i2s))
+ cgfr |= I2S_CGFR_I2SCFG_SET(I2S_I2SMOD_FD_MASTER);
+ else if (STM32_I2S_IS_PLAYBACK(i2s))
+ cgfr |= I2S_CGFR_I2SCFG_SET(I2S_I2SMOD_TX_MASTER);
+ else
+ cgfr |= I2S_CGFR_I2SCFG_SET(I2S_I2SMOD_RX_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 (i2s->refcount > 1) {
+ if (rate != i2s->rate) {
+ dev_err(cpu_dai->dev,
+ "rate not compatible with active stream");
+ return -EINVAL;
+ }
+ return 0;
+ }
+ i2s->rate = rate;
+
+ 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_channel(struct snd_soc_dai *cpu_dai,
+ struct snd_pcm_hw_params *params)
+{
+ struct stm32_i2s_data *i2s = snd_soc_dai_get_drvdata(cpu_dai);
+ int format = params_width(params);
+ u32 cfgr, cfgr_mask;
+
+ if (i2s->refcount > 1) {
+ if (format != i2s->format) {
+ dev_err(cpu_dai->dev,
+ "format not compatible with active stream");
+ return -EINVAL;
+ }
+ return 0;
+ }
+ i2s->format = format;
+
+ 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)) {
+ /* As data length is either 16 or 32 bits, fixch always set */
+ cfgr |= I2S_CGFR_FIXCH;
+ cfgr_mask |= I2S_CGFR_FIXCH;
+ }
+
+ return regmap_update_bits(i2s->regmap, STM32_I2S_CGFR_REG,
+ cfgr_mask, cfgr);
+}
+
+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);
+ i2s->refcount++;
+ spin_unlock(&i2s->lock_fd);
+
+ ret = regmap_update_bits(i2s->regmap, STM32_I2S_IFCR_REG,
+ I2S_IFCR_MASK, 0);
+ 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 format = params_width(params);
+ 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;
+ }
+
+ /*
+ * fthlv is fifo threshold expressed as sample number
+ * fthlv = fifo size * threshold_ratio / (format / 8)
+ * where threshold_ratio = fifo_th / 4
+ */
+ fthlv = STM32_I2S_FIFO_SIZE * 8 * i2s->fifo_th / (format * 4);
+
+ regmap_update_bits(i2s->regmap, STM32_I2S_CFG1_REG, I2S_CFG1_FTHVL_MASK,
+ I2S_CFG1_FTHVL_SET(fthlv - 1));
+
+ spin_lock(&i2s->lock_fd);
+
+ ret = stm32_i2s_configure_channel(cpu_dai, params);
+ if (ret < 0) {
+ spin_unlock(&i2s->lock_fd);
+ return ret;
+ }
+
+ if (STM32_I2S_IS_MASTER(i2s)) {
+ ret = stm32_i2s_configure_clock(cpu_dai, params);
+ if (ret < 0) {
+ spin_unlock(&i2s->lock_fd);
+ return ret;
+ }
+ }
+
+ spin_unlock(&i2s->lock_fd);
+
+ return 0;
+}
+
+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);
+ int ret;
+ bool stream_is_playback = false;
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ stream_is_playback = true;
+
+ /* This lock protects both start flag and SPE bit accesses */
+ spin_lock(&i2s->lock_fd);
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ case SNDRV_PCM_TRIGGER_RESUME:
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ if (stream_is_playback) {
+ ret = regmap_update_bits(i2s->regmap,
+ STM32_I2S_CFG1_REG,
+ I2S_CFG1_TXDMAEN,
+ I2S_CFG1_TXDMAEN);
+ } else {
+ ret = regmap_update_bits(i2s->regmap,
+ STM32_I2S_CFG1_REG,
+ I2S_CFG1_RXDMAEN,
+ I2S_CFG1_RXDMAEN);
+ }
+ if (ret < 0)
+ goto err_trigger;
+
+ i2s->startcount++;
+ if (STM32_I2S_IS_FULL_DUPLEX(i2s) && (i2s->startcount < 2)) {
+ dev_dbg(cpu_dai->dev,
+ "Full duplex device waiting for %s stream",
+ stream_is_playback ? "capture" : "playback");
+ spin_unlock(&i2s->lock_fd);
+ return 0;
+ }
+
+ /* 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);
+ goto err_trigger;
+ }
+
+ 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);
+ goto err_trigger;
+ }
+ 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);
+ goto err_trigger;
+ }
+ i2s->startcount = 0;
+
+ if (stream_is_playback) {
+ ret = regmap_update_bits(i2s->regmap,
+ STM32_I2S_CFG1_REG,
+ I2S_CFG1_TXDMAEN, 0);
+ } else {
+ ret = regmap_update_bits(i2s->regmap,
+ STM32_I2S_CFG1_REG,
+ I2S_CFG1_RXDMAEN, 0);
+ }
+ if (ret < 0)
+ goto err_trigger;
+
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ spin_unlock(&i2s->lock_fd);
+ return 0;
+
+err_trigger:
+ spin_unlock(&i2s->lock_fd);
+ return ret;
+}
+
+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);
+ if (i2s->refcount > 0)
+ i2s->refcount--;
+ 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;
+
+ i2s->dir = cpu_dai->id;
+ switch (i2s->dir) {
+ case I2S_DIR_TX:
+ i2s->fifo_th = I2S_FIFO_TH_FULL;
+ snd_soc_dai_init_dma_data(cpu_dai, dma_data_tx, NULL);
+ break;
+ case I2S_DIR_RX:
+ i2s->fifo_th = I2S_FIFO_TH_HALF;
+ snd_soc_dai_init_dma_data(cpu_dai, NULL, dma_data_rx);
+ break;
+ case I2S_DIR_FD:
+ i2s->fifo_th = I2S_FIFO_TH_NONE;
+ snd_soc_dai_init_dma_data(cpu_dai, dma_data_tx, dma_data_rx);
+ break;
+ }
+
+ 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;
+ int i;
+
+ dai_ptr = devm_kzalloc(&pdev->dev, STM32_I2S_DAIS_NB *
+ sizeof(struct snd_soc_dai_driver), GFP_KERNEL);
+ if (!dai_ptr)
+ return -ENOMEM;
+
+ i2s->dai_drv = dai_ptr;
+ for (i = 0; i < STM32_I2S_DAIS_NB; i++) {
+ dai_ptr->probe = stm32_i2s_dai_probe;
+ dai_ptr->ops = &stm32_i2s_pcm_dai_ops;
+ if (i == 0) {
+ snprintf(i2s->dais_name[i], STM32_I2S_DAI_NAME_SIZE,
+ "%s-playback", i2s->ip_name);
+ dai_ptr->id = I2S_DIR_TX;
+ stm32_i2s_dai_init(&dai_ptr->playback, "CPU-Playback");
+ }
+ if (i == 1) {
+ snprintf(i2s->dais_name[i], STM32_I2S_DAI_NAME_SIZE,
+ "%s-capture", i2s->ip_name);
+ dai_ptr->id = I2S_DIR_RX;
+ stm32_i2s_dai_init(&dai_ptr->capture, "CPU-Capture");
+ }
+ if (i == 2) {
+ snprintf(i2s->dais_name[i], STM32_I2S_DAI_NAME_SIZE,
+ "%s-full-duplex", i2s->ip_name);
+ dai_ptr->id = I2S_DIR_FD;
+ stm32_i2s_dai_init(&dai_ptr->playback,
+ "CPU-FD-Playback");
+ stm32_i2s_dai_init(&dai_ptr->capture,
+ "CPU-FD-Capture");
+ }
+ dai_ptr->name = i2s->dais_name[i];
+ 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;
+
+ i2s->pdev = pdev;
+ i2s->ms_flg = I2S_MS_NOT_SET;
+ i2s->ip_name = strstr(dev_name(&pdev->dev), ".") + 1;
+ spin_lock_init(&i2s->lock_fd);
+ platform_set_drvdata(pdev, i2s);
+
+ ret = stm32_i2s_parse_dt(pdev, i2s);
+ if (ret)
+ return ret;
+
+ 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, STM32_I2S_DAIS_NB);
+ 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");
--
1.9.1