[PATCH v2 2/2] ASoC: stm32: Add SPDIFRX support

From: olivier moysan
Date: Tue Jun 20 2017 - 05:59:22 EST

Add SPDIFRX support to STM32.

Signed-off-by: olivier moysan <olivier.moysan@xxxxxx>
---
sound/soc/stm/Kconfig | 10 +
sound/soc/stm/Makefile | 4 +
sound/soc/stm/stm32_spdifrx.c | 998 ++++++++++++++++++++++++++++++++++++++++++
3 files changed, 1012 insertions(+)
create mode 100644 sound/soc/stm/stm32_spdifrx.c

diff --git a/sound/soc/stm/Kconfig b/sound/soc/stm/Kconfig
index 23600a5..3398e6c 100644
--- a/sound/soc/stm/Kconfig
+++ b/sound/soc/stm/Kconfig
@@ -18,4 +18,14 @@ config SND_SOC_STM32_I2S
help
Say Y if you want to enable I2S for STM32

+config SND_SOC_STM32_SPDIFRX
+ tristate "STM32 S/PDIF receiver (SPDIFRX) support"
+ depends on ARCH_STM32 || COMPILE_TEST
+ depends on SND_SOC
+ select SND_SOC_GENERIC_DMAENGINE_PCM
+ select REGMAP_MMIO
+ select SND_SOC_SPDIF
+ help
+ Say Y if you want to enable S/PDIF capture for STM32
+
endmenu
diff --git a/sound/soc/stm/Makefile b/sound/soc/stm/Makefile
index 4140c67..4ed22e6 100644
--- a/sound/soc/stm/Makefile
+++ b/sound/soc/stm/Makefile
@@ -8,3 +8,7 @@ obj-$(CONFIG_SND_SOC_STM32_SAI) += snd-soc-stm32-sai.o
# I2S
snd-soc-stm32-i2s-objs := stm32_i2s.o
obj-$(CONFIG_SND_SOC_STM32_I2S) += snd-soc-stm32-i2s.o
+
+# SPDIFRX
+snd-soc-stm32-spdifrx-objs := stm32_spdifrx.o
+obj-$(CONFIG_SND_SOC_STM32_SPDIFRX) += snd-soc-stm32-spdifrx.o
diff --git a/sound/soc/stm/stm32_spdifrx.c b/sound/soc/stm/stm32_spdifrx.c
new file mode 100644
index 0000000..4e4250b
--- /dev/null
+++ b/sound/soc/stm/stm32_spdifrx.c
@@ -0,0 +1,998 @@
+/*
+ * STM32 ALSA SoC Digital Audio Interface (SPDIF-rx) driver.
+ *
+ * Copyright (C) 2017, STMicroelectronics - All Rights Reserved
+ * Author(s): Olivier Moysan <olivier.moysan@xxxxxx> 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/completion.h>
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/of_platform.h>
+#include <linux/regmap.h>
+#include <linux/reset.h>
+
+#include <sound/dmaengine_pcm.h>
+#include <sound/pcm_params.h>
+
+/* SPDIF-rx Register Map */
+#define STM32_SPDIFRX_CR 0x00
+#define STM32_SPDIFRX_IMR 0x04
+#define STM32_SPDIFRX_SR 0x08
+#define STM32_SPDIFRX_IFCR 0x0C
+#define STM32_SPDIFRX_DR 0x10
+#define STM32_SPDIFRX_CSR 0x14
+#define STM32_SPDIFRX_DIR 0x18
+
+/* Bit definition for SPDIF_CR register */
+#define SPDIFRX_CR_SPDIFEN_SHIFT 0
+#define SPDIFRX_CR_SPDIFEN_MASK GENMASK(1, SPDIFRX_CR_SPDIFEN_SHIFT)
+#define SPDIFRX_CR_SPDIFENSET(x) ((x) << SPDIFRX_CR_SPDIFEN_SHIFT)
+
+#define SPDIFRX_CR_RXDMAEN BIT(2)
+#define SPDIFRX_CR_RXSTEO BIT(3)
+
+#define SPDIFRX_CR_DRFMT_SHIFT 4
+#define SPDIFRX_CR_DRFMT_MASK GENMASK(5, SPDIFRX_CR_DRFMT_SHIFT)
+#define SPDIFRX_CR_DRFMTSET(x) ((x) << SPDIFRX_CR_DRFMT_SHIFT)
+
+#define SPDIFRX_CR_PMSK BIT(6)
+#define SPDIFRX_CR_VMSK BIT(7)
+#define SPDIFRX_CR_CUMSK BIT(8)
+#define SPDIFRX_CR_PTMSK BIT(9)
+#define SPDIFRX_CR_CBDMAEN BIT(10)
+#define SPDIFRX_CR_CHSEL_SHIFT 11
+#define SPDIFRX_CR_CHSEL BIT(SPDIFRX_CR_CHSEL_SHIFT)
+
+#define SPDIFRX_CR_NBTR_SHIFT 12
+#define SPDIFRX_CR_NBTR_MASK GENMASK(13, SPDIFRX_CR_NBTR_SHIFT)
+#define SPDIFRX_CR_NBTRSET(x) ((x) << SPDIFRX_CR_NBTR_SHIFT)
+
+#define SPDIFRX_CR_WFA BIT(14)
+
+#define SPDIFRX_CR_INSEL_SHIFT 16
+#define SPDIFRX_CR_INSEL_MASK GENMASK(18, PDIFRX_CR_INSEL_SHIFT)
+#define SPDIFRX_CR_INSELSET(x) ((x) << SPDIFRX_CR_INSEL_SHIFT)
+
+#define SPDIFRX_CR_CKSEN_SHIFT 20
+#define SPDIFRX_CR_CKSEN BIT(20)
+#define SPDIFRX_CR_CKSBKPEN BIT(21)
+
+/* Bit definition for SPDIFRX_IMR register */
+#define SPDIFRX_IMR_RXNEI BIT(0)
+#define SPDIFRX_IMR_CSRNEIE BIT(1)
+#define SPDIFRX_IMR_PERRIE BIT(2)
+#define SPDIFRX_IMR_OVRIE BIT(3)
+#define SPDIFRX_IMR_SBLKIE BIT(4)
+#define SPDIFRX_IMR_SYNCDIE BIT(5)
+#define SPDIFRX_IMR_IFEIE BIT(6)
+
+#define SPDIFRX_XIMR_MASK GENMASK(6, 0)
+
+/* Bit definition for SPDIFRX_SR register */
+#define SPDIFRX_SR_RXNE BIT(0)
+#define SPDIFRX_SR_CSRNE BIT(1)
+#define SPDIFRX_SR_PERR BIT(2)
+#define SPDIFRX_SR_OVR BIT(3)
+#define SPDIFRX_SR_SBD BIT(4)
+#define SPDIFRX_SR_SYNCD BIT(5)
+#define SPDIFRX_SR_FERR BIT(6)
+#define SPDIFRX_SR_SERR BIT(7)
+#define SPDIFRX_SR_TERR BIT(8)
+
+#define SPDIFRX_SR_WIDTH5_SHIFT 16
+#define SPDIFRX_SR_WIDTH5_MASK GENMASK(30, PDIFRX_SR_WIDTH5_SHIFT)
+#define SPDIFRX_SR_WIDTH5SET(x) ((x) << SPDIFRX_SR_WIDTH5_SHIFT)
+
+/* Bit definition for SPDIFRX_IFCR register */
+#define SPDIFRX_IFCR_PERRCF BIT(2)
+#define SPDIFRX_IFCR_OVRCF BIT(3)
+#define SPDIFRX_IFCR_SBDCF BIT(4)
+#define SPDIFRX_IFCR_SYNCDCF BIT(5)
+
+#define SPDIFRX_XIFCR_MASK GENMASK(5, 2)
+
+/* Bit definition for SPDIFRX_DR register (DRFMT = 0b00) */
+#define SPDIFRX_DR0_DR_SHIFT 0
+#define SPDIFRX_DR0_DR_MASK GENMASK(23, SPDIFRX_DR0_DR_SHIFT)
+#define SPDIFRX_DR0_DRSET(x) ((x) << SPDIFRX_DR0_DR_SHIFT)
+
+#define SPDIFRX_DR0_PE BIT(24)
+
+#define SPDIFRX_DR0_V BIT(25)
+#define SPDIFRX_DR0_U BIT(26)
+#define SPDIFRX_DR0_C BIT(27)
+
+#define SPDIFRX_DR0_PT_SHIFT 28
+#define SPDIFRX_DR0_PT_MASK GENMASK(29, SPDIFRX_DR0_PT_SHIFT)
+#define SPDIFRX_DR0_PTSET(x) ((x) << SPDIFRX_DR0_PT_SHIFT)
+
+/* Bit definition for SPDIFRX_DR register (DRFMT = 0b01) */
+#define SPDIFRX_DR1_PE BIT(0)
+#define SPDIFRX_DR1_V BIT(1)
+#define SPDIFRX_DR1_U BIT(2)
+#define SPDIFRX_DR1_C BIT(3)
+
+#define SPDIFRX_DR1_PT_SHIFT 4
+#define SPDIFRX_DR1_PT_MASK GENMASK(5, SPDIFRX_DR1_PT_SHIFT)
+#define SPDIFRX_DR1_PTSET(x) ((x) << SPDIFRX_DR1_PT_SHIFT)
+
+#define SPDIFRX_DR1_DR_SHIFT 8
+#define SPDIFRX_DR1_DR_MASK GENMASK(31, SPDIFRX_DR1_DR_SHIFT)
+#define SPDIFRX_DR1_DRSET(x) ((x) << SPDIFRX_DR1_DR_SHIFT)
+
+/* Bit definition for SPDIFRX_DR register (DRFMT = 0b10) */
+#define SPDIFRX_DR1_DRNL1_SHIFT 0
+#define SPDIFRX_DR1_DRNL1_MASK GENMASK(15, SPDIFRX_DR1_DRNL1_SHIFT)
+#define SPDIFRX_DR1_DRNL1SET(x) ((x) << SPDIFRX_DR1_DRNL1_SHIFT)
+
+#define SPDIFRX_DR1_DRNL2_SHIFT 16
+#define SPDIFRX_DR1_DRNL2_MASK GENMASK(31, SPDIFRX_DR1_DRNL2_SHIFT)
+#define SPDIFRX_DR1_DRNL2SET(x) ((x) << SPDIFRX_DR1_DRNL2_SHIFT)
+
+/* Bit definition for SPDIFRX_CSR register */
+#define SPDIFRX_CSR_USR_SHIFT 0
+#define SPDIFRX_CSR_USR_MASK GENMASK(15, SPDIFRX_CSR_USR_SHIFT)
+#define SPDIFRX_CSR_USRGET(x) (((x) & SPDIFRX_CSR_USR_MASK)\
+ >> SPDIFRX_CSR_USR_SHIFT)
+
+#define SPDIFRX_CSR_CS_SHIFT 16
+#define SPDIFRX_CSR_CS_MASK GENMASK(23, SPDIFRX_CSR_CS_SHIFT)
+#define SPDIFRX_CSR_CSGET(x) (((x) & SPDIFRX_CSR_CS_MASK)\
+ >> SPDIFRX_CSR_CS_SHIFT)
+
+#define SPDIFRX_CSR_SOB BIT(24)
+
+/* Bit definition for SPDIFRX_DIR register */
+#define SPDIFRX_DIR_THI_SHIFT 0
+#define SPDIFRX_DIR_THI_MASK GENMASK(12, SPDIFRX_DIR_THI_SHIFT)
+#define SPDIFRX_DIR_THI_SET(x) ((x) << SPDIFRX_DIR_THI_SHIFT)
+
+#define SPDIFRX_DIR_TLO_SHIFT 16
+#define SPDIFRX_DIR_TLO_MASK GENMASK(28, SPDIFRX_DIR_TLO_SHIFT)
+#define SPDIFRX_DIR_TLO_SET(x) ((x) << SPDIFRX_DIR_TLO_SHIFT)
+
+#define SPDIFRX_SPDIFEN_DISABLE 0x0
+#define SPDIFRX_SPDIFEN_SYNC 0x1
+#define SPDIFRX_SPDIFEN_ENABLE 0x3
+
+#define SPDIFRX_IN1 0x1
+#define SPDIFRX_IN2 0x2
+#define SPDIFRX_IN3 0x3
+#define SPDIFRX_IN4 0x4
+#define SPDIFRX_IN5 0x5
+#define SPDIFRX_IN6 0x6
+#define SPDIFRX_IN7 0x7
+#define SPDIFRX_IN8 0x8
+
+#define SPDIFRX_NBTR_NONE 0x0
+#define SPDIFRX_NBTR_3 0x1
+#define SPDIFRX_NBTR_15 0x2
+#define SPDIFRX_NBTR_63 0x3
+
+#define SPDIFRX_DRFMT_RIGHT 0x0
+#define SPDIFRX_DRFMT_LEFT 0x1
+#define SPDIFRX_DRFMT_PACKED 0x2
+
+/* 192 CS bits in S/PDIF frame. i.e 24 CS bytes */
+#define SPDIFRX_CS_BYTES_NB 24
+#define SPDIFRX_UB_BYTES_NB 48
+
+/*
+ * CSR register is retrieved as a 32 bits word
+ * It contains 1 channel status byte and 2 user data bytes
+ * 2 S/PDIF frames are acquired to get all CS/UB bits
+ */
+#define SPDIFRX_CSR_BUF_LENGTH (SPDIFRX_CS_BYTES_NB * 4 * 2)
+
+/**
+ * struct stm32_spdifrx_data - private data of SPDIFRX
+ * @pdev: device data pointer
+ * @base: mmio register base virtual address
+ * @regmap: SPDIFRX register map pointer
+ * @regmap_conf: SPDIFRX register map configuration pointer
+ * @cs_completion: channel status retrieving completion
+ * @kclk: kernel clock feeding the SPDIFRX clock generator
+ * @dma_params: dma configuration data for rx channel
+ * @substream: PCM substream data pointer
+ * @dmab: dma buffer info pointer
+ * @ctrl_chan: dma channel for S/PDIF control bits
+ * @desc:dma async transaction descriptor
+ * @slave_config: dma slave channel runtime config pointer
+ * @phys_addr: SPDIFRX registers physical base address
+ * @lock: synchronization enabling lock
+ * @cs: channel status buffer
+ * @ub: user data buffer
+ * @irq: SPDIFRX interrupt line
+ * @refcount: keep count of opened DMA channels
+ */
+struct stm32_spdifrx_data {
+ struct platform_device *pdev;
+ void __iomem *base;
+ struct regmap *regmap;
+ const struct regmap_config *regmap_conf;
+ struct completion cs_completion;
+ struct clk *kclk;
+ struct snd_dmaengine_dai_dma_data dma_params;
+ struct snd_pcm_substream *substream;
+ struct snd_dma_buffer *dmab;
+ struct dma_chan *ctrl_chan;
+ struct dma_async_tx_descriptor *desc;
+ struct dma_slave_config slave_config;
+ dma_addr_t phys_addr;
+ spinlock_t lock; /* Sync enabling lock */
+ unsigned char cs[SPDIFRX_CS_BYTES_NB];
+ unsigned char ub[SPDIFRX_UB_BYTES_NB];
+ int irq;
+ int refcount;
+};
+
+static void stm32_spdifrx_dma_complete(void *data)
+{
+ struct stm32_spdifrx_data *spdifrx = (struct stm32_spdifrx_data *)data;
+ struct platform_device *pdev = spdifrx->pdev;
+ u32 *p_start = (u32 *)spdifrx->dmab->area;
+ u32 *p_end = p_start + (2 * SPDIFRX_CS_BYTES_NB) - 1;
+ u32 *ptr = p_start;
+ u16 *ub_ptr = (short *)spdifrx->ub;
+ int i = 0;
+
+ regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR,
+ SPDIFRX_CR_CBDMAEN,
+ (unsigned int)~SPDIFRX_CR_CBDMAEN);
+
+ if (!spdifrx->dmab->area)
+ return;
+
+ while (ptr <= p_end) {
+ if (*ptr & SPDIFRX_CSR_SOB)
+ break;
+ ptr++;
+ }
+
+ if (ptr > p_end) {
+ dev_err(&pdev->dev, "Start of S/PDIF block not found\n");
+ return;
+ }
+
+ while (i < SPDIFRX_CS_BYTES_NB) {
+ spdifrx->cs[i] = (unsigned char)SPDIFRX_CSR_CSGET(*ptr);
+ *ub_ptr++ = SPDIFRX_CSR_USRGET(*ptr++);
+ if (ptr > p_end) {
+ dev_err(&pdev->dev, "Failed to get channel status\n");
+ return;
+ }
+ i++;
+ }
+
+ complete(&spdifrx->cs_completion);
+}
+
+static int stm32_spdifrx_dma_ctrl_start(struct stm32_spdifrx_data *spdifrx)
+{
+ dma_cookie_t cookie;
+ int err;
+
+ spdifrx->desc = dmaengine_prep_slave_single(spdifrx->ctrl_chan,
+ spdifrx->dmab->addr,
+ SPDIFRX_CSR_BUF_LENGTH,
+ DMA_DEV_TO_MEM,
+ DMA_CTRL_ACK);
+ if (!spdifrx->desc)
+ return -EINVAL;
+
+ spdifrx->desc->callback = stm32_spdifrx_dma_complete;
+ spdifrx->desc->callback_param = spdifrx;
+ cookie = dmaengine_submit(spdifrx->desc);
+ err = dma_submit_error(cookie);
+ if (err)
+ return -EINVAL;
+
+ dma_async_issue_pending(spdifrx->ctrl_chan);
+
+ return 0;
+}
+
+static void stm32_spdifrx_dma_ctrl_stop(struct stm32_spdifrx_data *spdifrx)
+{
+ dmaengine_terminate_async(spdifrx->ctrl_chan);
+}
+
+static int stm32_spdifrx_start_sync(struct stm32_spdifrx_data *spdifrx)
+{
+ int cr, cr_mask, imr, ret;
+
+ /* Enable IRQs */
+ imr = SPDIFRX_IMR_IFEIE | SPDIFRX_IMR_SYNCDIE | SPDIFRX_IMR_PERRIE;
+ ret = regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_IMR, imr, imr);
+ if (ret)
+ return ret;
+
+ spin_lock(&spdifrx->lock);
+
+ spdifrx->refcount++;
+
+ regmap_read(spdifrx->regmap, STM32_SPDIFRX_CR, &cr);
+
+ if (!(cr & SPDIFRX_CR_SPDIFEN_MASK)) {
+ /*
+ * Start sync if SPDIFRX is still in idle state.
+ * SPDIFRX reception enabled when sync done
+ */
+ dev_dbg(&spdifrx->pdev->dev, "start synchronization\n");
+
+ /*
+ * SPDIFRX configuration:
+ * Wait for activity before starting sync process. This avoid
+ * to issue sync errors when spdif signal is missing on input.
+ * Preamble, CS, user, validity and parity error bits not copied
+ * to DR register.
+ */
+ cr = SPDIFRX_CR_WFA | SPDIFRX_CR_PMSK | SPDIFRX_CR_VMSK |
+ SPDIFRX_CR_CUMSK | SPDIFRX_CR_PTMSK | SPDIFRX_CR_RXSTEO;
+ cr_mask = cr;
+
+ cr |= SPDIFRX_CR_SPDIFENSET(SPDIFRX_SPDIFEN_SYNC);
+ cr_mask |= SPDIFRX_CR_SPDIFEN_MASK;
+ ret = regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR,
+ cr_mask, cr);
+ if (ret < 0)
+ dev_err(&spdifrx->pdev->dev,
+ "Failed to start synchronization\n");
+ }
+
+ spin_unlock(&spdifrx->lock);
+
+ return ret;
+}
+
+static void stm32_spdifrx_stop(struct stm32_spdifrx_data *spdifrx)
+{
+ int cr, cr_mask, reg;
+
+ spin_lock(&spdifrx->lock);
+
+ if (--spdifrx->refcount) {
+ spin_unlock(&spdifrx->lock);
+ return;
+ }
+
+ cr = SPDIFRX_CR_SPDIFENSET(SPDIFRX_SPDIFEN_DISABLE);
+ cr_mask = SPDIFRX_CR_SPDIFEN_MASK | SPDIFRX_CR_RXDMAEN;
+
+ regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR, cr_mask, cr);
+
+ regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_IMR,
+ SPDIFRX_XIMR_MASK, 0);
+
+ regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_IFCR,
+ SPDIFRX_XIFCR_MASK, SPDIFRX_XIFCR_MASK);
+
+ /* dummy read to clear CSRNE and RXNE in status register */
+ regmap_read(spdifrx->regmap, STM32_SPDIFRX_DR, &reg);
+ regmap_read(spdifrx->regmap, STM32_SPDIFRX_CSR, &reg);
+
+ spin_unlock(&spdifrx->lock);
+}
+
+static int stm32_spdifrx_dma_ctrl_register(struct device *dev,
+ struct stm32_spdifrx_data *spdifrx)
+{
+ int ret;
+
+ spdifrx->dmab = devm_kzalloc(dev, sizeof(struct snd_dma_buffer),
+ GFP_KERNEL);
+ if (!spdifrx->dmab)
+ return -ENOMEM;
+
+ spdifrx->dmab->dev.type = SNDRV_DMA_TYPE_DEV_IRAM;
+ spdifrx->dmab->dev.dev = dev;
+ ret = snd_dma_alloc_pages(spdifrx->dmab->dev.type, dev,
+ SPDIFRX_CSR_BUF_LENGTH, spdifrx->dmab);
+ if (ret < 0) {
+ dev_err(dev, "snd_dma_alloc_pages returned error %d\n", ret);
+ return ret;
+ }
+
+ spdifrx->ctrl_chan = dma_request_chan(dev, "rx-ctrl");
+ if (!spdifrx->ctrl_chan) {
+ dev_err(dev, "dma_request_slave_channel failed\n");
+ return -EINVAL;
+ }
+
+ spdifrx->slave_config.direction = DMA_DEV_TO_MEM;
+ spdifrx->slave_config.src_addr = (dma_addr_t)(spdifrx->phys_addr +
+ STM32_SPDIFRX_CSR);
+ spdifrx->slave_config.dst_addr = spdifrx->dmab->addr;
+ spdifrx->slave_config.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+ spdifrx->slave_config.src_maxburst = 1;
+
+ ret = dmaengine_slave_config(spdifrx->ctrl_chan,
+ &spdifrx->slave_config);
+ if (ret < 0) {
+ dev_err(dev, "dmaengine_slave_config returned error %d\n", ret);
+ dma_release_channel(spdifrx->ctrl_chan);
+ spdifrx->ctrl_chan = NULL;
+ }
+
+ return ret;
+};
+
+static const char * const spdifrx_enum_input[] = {
+ "in0", "in1", "in2", "in3"
+};
+
+/* By default CS bits are retrieved from channel A */
+static const char * const spdifrx_enum_cs_channel[] = {
+ "A", "B"
+};
+
+static SOC_ENUM_SINGLE_DECL(ctrl_enum_input,
+ STM32_SPDIFRX_CR, SPDIFRX_CR_INSEL_SHIFT,
+ spdifrx_enum_input);
+
+static SOC_ENUM_SINGLE_DECL(ctrl_enum_cs_channel,
+ STM32_SPDIFRX_CR, SPDIFRX_CR_CHSEL_SHIFT,
+ spdifrx_enum_cs_channel);
+
+static int stm32_spdifrx_info(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_info *uinfo)
+{
+ uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
+ uinfo->count = 1;
+
+ return 0;
+}
+
+static int stm32_spdifrx_ub_info(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_info *uinfo)
+{
+ uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
+ uinfo->count = 1;
+
+ return 0;
+}
+
+static int stm32_spdifrx_get_ctrl_data(struct stm32_spdifrx_data *spdifrx)
+{
+ int ret = 0;
+
+ memset(spdifrx->cs, 0, SPDIFRX_CS_BYTES_NB);
+ memset(spdifrx->ub, 0, SPDIFRX_UB_BYTES_NB);
+
+ ret = stm32_spdifrx_dma_ctrl_start(spdifrx);
+ if (ret < 0)
+ return ret;
+
+ ret = clk_prepare_enable(spdifrx->kclk);
+ if (ret) {
+ dev_err(&spdifrx->pdev->dev, "Enable kclk failed: %d\n", ret);
+ return ret;
+ }
+
+ ret = regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR,
+ SPDIFRX_CR_CBDMAEN, SPDIFRX_CR_CBDMAEN);
+ if (ret < 0)
+ goto end;
+
+ ret = stm32_spdifrx_start_sync(spdifrx);
+ if (ret < 0)
+ goto end;
+
+ if (wait_for_completion_interruptible_timeout(&spdifrx->cs_completion,
+ msecs_to_jiffies(100))
+ <= 0) {
+ dev_err(&spdifrx->pdev->dev, "Failed to get control data\n");
+ ret = -EAGAIN;
+ }
+
+ stm32_spdifrx_stop(spdifrx);
+ stm32_spdifrx_dma_ctrl_stop(spdifrx);
+
+end:
+ clk_disable_unprepare(spdifrx->kclk);
+
+ return ret;
+}
+
+static int stm32_spdifrx_capture_get(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol)
+{
+ struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
+ struct stm32_spdifrx_data *spdifrx = snd_soc_dai_get_drvdata(cpu_dai);
+
+ stm32_spdifrx_get_ctrl_data(spdifrx);
+
+ ucontrol->value.iec958.status[0] = spdifrx->cs[0];
+ ucontrol->value.iec958.status[1] = spdifrx->cs[1];
+ ucontrol->value.iec958.status[2] = spdifrx->cs[2];
+ ucontrol->value.iec958.status[3] = spdifrx->cs[3];
+ ucontrol->value.iec958.status[4] = spdifrx->cs[4];
+
+ return 0;
+}
+
+static int stm32_spdif_user_bits_get(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol)
+{
+ struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
+ struct stm32_spdifrx_data *spdifrx = snd_soc_dai_get_drvdata(cpu_dai);
+
+ stm32_spdifrx_get_ctrl_data(spdifrx);
+
+ ucontrol->value.iec958.status[0] = spdifrx->ub[0];
+ ucontrol->value.iec958.status[1] = spdifrx->ub[1];
+ ucontrol->value.iec958.status[2] = spdifrx->ub[2];
+ ucontrol->value.iec958.status[3] = spdifrx->ub[3];
+ ucontrol->value.iec958.status[4] = spdifrx->ub[4];
+
+ return 0;
+}
+
+static struct snd_kcontrol_new stm32_spdifrx_iec_ctrls[] = {
+ /* Channel status control */
+ {
+ .iface = SNDRV_CTL_ELEM_IFACE_PCM,
+ .name = SNDRV_CTL_NAME_IEC958("", CAPTURE, DEFAULT),
+ .access = SNDRV_CTL_ELEM_ACCESS_READ |
+ SNDRV_CTL_ELEM_ACCESS_VOLATILE,
+ .info = stm32_spdifrx_info,
+ .get = stm32_spdifrx_capture_get,
+ },
+ /* User bits control */
+ {
+ .iface = SNDRV_CTL_ELEM_IFACE_PCM,
+ .name = "IEC958 User Bit Capture Default",
+ .access = SNDRV_CTL_ELEM_ACCESS_READ |
+ SNDRV_CTL_ELEM_ACCESS_VOLATILE,
+ .info = stm32_spdifrx_ub_info,
+ .get = stm32_spdif_user_bits_get,
+ },
+};
+
+static struct snd_kcontrol_new stm32_spdifrx_ctrls[] = {
+ SOC_ENUM("SPDIFRX input", ctrl_enum_input),
+ SOC_ENUM("SPDIFRX CS channel", ctrl_enum_cs_channel),
+};
+
+static int stm32_spdifrx_dai_register_ctrls(struct snd_soc_dai *cpu_dai)
+{
+ int ret;
+
+ ret = snd_soc_add_dai_controls(cpu_dai, stm32_spdifrx_iec_ctrls,
+ ARRAY_SIZE(stm32_spdifrx_iec_ctrls));
+ if (ret < 0)
+ return ret;
+
+ return snd_soc_add_component_controls(cpu_dai->component,
+ stm32_spdifrx_ctrls,
+ ARRAY_SIZE(stm32_spdifrx_ctrls));
+}
+
+static int stm32_spdifrx_dai_probe(struct snd_soc_dai *cpu_dai)
+{
+ struct stm32_spdifrx_data *spdifrx = dev_get_drvdata(cpu_dai->dev);
+
+ spdifrx->dma_params.addr = (dma_addr_t)(spdifrx->phys_addr +
+ STM32_SPDIFRX_DR);
+ spdifrx->dma_params.maxburst = 1;
+
+ snd_soc_dai_init_dma_data(cpu_dai, NULL, &spdifrx->dma_params);
+
+ return stm32_spdifrx_dai_register_ctrls(cpu_dai);
+}
+
+static bool stm32_spdifrx_readable_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case STM32_SPDIFRX_CR:
+ case STM32_SPDIFRX_IMR:
+ case STM32_SPDIFRX_SR:
+ case STM32_SPDIFRX_IFCR:
+ case STM32_SPDIFRX_DR:
+ case STM32_SPDIFRX_CSR:
+ case STM32_SPDIFRX_DIR:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static bool stm32_spdifrx_volatile_reg(struct device *dev, unsigned int reg)
+{
+ if (reg == STM32_SPDIFRX_DR)
+ return true;
+
+ return false;
+}
+
+static bool stm32_spdifrx_writeable_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case STM32_SPDIFRX_CR:
+ case STM32_SPDIFRX_IMR:
+ case STM32_SPDIFRX_IFCR:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static const struct regmap_config stm32_h7_spdifrx_regmap_conf = {
+ .reg_bits = 32,
+ .reg_stride = 4,
+ .val_bits = 32,
+ .max_register = STM32_SPDIFRX_DIR,
+ .readable_reg = stm32_spdifrx_readable_reg,
+ .volatile_reg = stm32_spdifrx_volatile_reg,
+ .writeable_reg = stm32_spdifrx_writeable_reg,
+ .fast_io = true,
+};
+
+static irqreturn_t stm32_spdifrx_isr(int irq, void *devid)
+{
+ struct stm32_spdifrx_data *spdifrx = (struct stm32_spdifrx_data *)devid;
+ struct snd_pcm_substream *substream = spdifrx->substream;
+ struct platform_device *pdev = spdifrx->pdev;
+ unsigned int cr, mask, sr, imr;
+ unsigned int flags;
+ int err = 0, err_xrun = 0;
+
+ regmap_read(spdifrx->regmap, STM32_SPDIFRX_SR, &sr);
+ regmap_read(spdifrx->regmap, STM32_SPDIFRX_IMR, &imr);
+
+ mask = imr & SPDIFRX_XIMR_MASK;
+ /* SERR, TERR, FERR IRQs are generated if IFEIE is set */
+ if (mask & SPDIFRX_IMR_IFEIE)
+ mask |= (SPDIFRX_IMR_IFEIE << 1) | (SPDIFRX_IMR_IFEIE << 2);
+
+ flags = sr & mask;
+ if (!flags) {
+ dev_err(&pdev->dev, "Unexpected IRQ. rflags=%#x, imr=%#x\n",
+ sr, imr);
+ return IRQ_NONE;
+ }
+
+ /* Clear IRQs */
+ regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_IFCR,
+ SPDIFRX_XIFCR_MASK, flags);
+
+ if (flags & SPDIFRX_SR_PERR) {
+ dev_dbg(&pdev->dev, "Parity error\n");
+ err_xrun = 1;
+ }
+
+ if (flags & SPDIFRX_SR_OVR) {
+ dev_dbg(&pdev->dev, "Overrun error\n");
+ err_xrun = 1;
+ }
+
+ if (flags & SPDIFRX_SR_SBD)
+ dev_dbg(&pdev->dev, "Synchronization block detected\n");
+
+ if (flags & SPDIFRX_SR_SYNCD) {
+ dev_dbg(&pdev->dev, "Synchronization done\n");
+
+ /* Enable spdifrx */
+ cr = SPDIFRX_CR_SPDIFENSET(SPDIFRX_SPDIFEN_ENABLE);
+ regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR,
+ SPDIFRX_CR_SPDIFEN_MASK, cr);
+ }
+
+ if (flags & SPDIFRX_SR_FERR) {
+ dev_dbg(&pdev->dev, "Frame error\n");
+ err = 1;
+ }
+
+ if (flags & SPDIFRX_SR_SERR) {
+ dev_dbg(&pdev->dev, "Synchronization error\n");
+ err = 1;
+ }
+
+ if (flags & SPDIFRX_SR_TERR) {
+ dev_dbg(&pdev->dev, "Timeout error\n");
+ err = 1;
+ }
+
+ if (err) {
+ /* SPDIFRX in STATE_STOP. Disable SPDIFRX to clear errors */
+ cr = SPDIFRX_CR_SPDIFENSET(SPDIFRX_SPDIFEN_DISABLE);
+ regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR,
+ SPDIFRX_CR_SPDIFEN_MASK, cr);
+
+ if (substream)
+ snd_pcm_stop(substream, SNDRV_PCM_STATE_DISCONNECTED);
+
+ return IRQ_HANDLED;
+ }
+
+ if (err_xrun && substream)
+ snd_pcm_stop_xrun(substream);
+
+ return IRQ_HANDLED;
+}
+
+static int stm32_spdifrx_startup(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *cpu_dai)
+{
+ struct stm32_spdifrx_data *spdifrx = snd_soc_dai_get_drvdata(cpu_dai);
+ int ret;
+
+ spdifrx->substream = substream;
+
+ ret = clk_prepare_enable(spdifrx->kclk);
+ if (ret)
+ dev_err(&spdifrx->pdev->dev, "Enable kclk failed: %d\n", ret);
+
+ return ret;
+}
+
+static int stm32_spdifrx_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params,
+ struct snd_soc_dai *cpu_dai)
+{
+ struct stm32_spdifrx_data *spdifrx = snd_soc_dai_get_drvdata(cpu_dai);
+ int data_size = params_width(params);
+ int fmt;
+
+ switch (data_size) {
+ case 16:
+ fmt = SPDIFRX_DRFMT_PACKED;
+ spdifrx->dma_params.addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
+ break;
+ case 32:
+ fmt = SPDIFRX_DRFMT_LEFT;
+ spdifrx->dma_params.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+ break;
+ default:
+ dev_err(&spdifrx->pdev->dev, "Unexpected data format\n");
+ return -EINVAL;
+ }
+
+ snd_soc_dai_init_dma_data(cpu_dai, NULL, &spdifrx->dma_params);
+
+ return regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR,
+ SPDIFRX_CR_DRFMT_MASK,
+ SPDIFRX_CR_DRFMTSET(fmt));
+}
+
+static int stm32_spdifrx_trigger(struct snd_pcm_substream *substream, int cmd,
+ struct snd_soc_dai *cpu_dai)
+{
+ struct stm32_spdifrx_data *spdifrx = snd_soc_dai_get_drvdata(cpu_dai);
+ int ret = 0;
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ case SNDRV_PCM_TRIGGER_RESUME:
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_IMR,
+ SPDIFRX_IMR_OVRIE, SPDIFRX_IMR_OVRIE);
+
+ regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR,
+ SPDIFRX_CR_RXDMAEN, SPDIFRX_CR_RXDMAEN);
+
+ ret = stm32_spdifrx_start_sync(spdifrx);
+ break;
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ case SNDRV_PCM_TRIGGER_STOP:
+ stm32_spdifrx_stop(spdifrx);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return ret;
+}
+
+static void stm32_spdifrx_shutdown(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *cpu_dai)
+{
+ struct stm32_spdifrx_data *spdifrx = snd_soc_dai_get_drvdata(cpu_dai);
+
+ spdifrx->substream = NULL;
+ clk_disable_unprepare(spdifrx->kclk);
+}
+
+static const struct snd_soc_dai_ops stm32_spdifrx_pcm_dai_ops = {
+ .startup = stm32_spdifrx_startup,
+ .hw_params = stm32_spdifrx_hw_params,
+ .trigger = stm32_spdifrx_trigger,
+ .shutdown = stm32_spdifrx_shutdown,
+};
+
+static struct snd_soc_dai_driver stm32_spdifrx_dai[] = {
+ {
+ .name = "spdifrx-capture-cpu-dai",
+ .probe = stm32_spdifrx_dai_probe,
+ .capture = {
+ .stream_name = "CPU-Capture",
+ .channels_min = 1,
+ .channels_max = 2,
+ .rates = SNDRV_PCM_RATE_8000_192000,
+ .formats = SNDRV_PCM_FMTBIT_S32_LE |
+ SNDRV_PCM_FMTBIT_S16_LE,
+ },
+ .ops = &stm32_spdifrx_pcm_dai_ops,
+ }
+};
+
+static const struct snd_pcm_hardware stm32_spdifrx_pcm_hw = {
+ .info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_MMAP,
+ .buffer_bytes_max = 8 * PAGE_SIZE,
+ .period_bytes_max = 2048, /* MDMA constraint */
+ .periods_min = 2,
+ .periods_max = 8,
+};
+
+static const struct snd_soc_component_driver stm32_spdifrx_component = {
+ .name = "stm32-spdifrx",
+};
+
+static const struct snd_dmaengine_pcm_config stm32_spdifrx_pcm_config = {
+ .pcm_hardware = &stm32_spdifrx_pcm_hw,
+ .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
+};
+
+static const struct of_device_id stm32_spdifrx_ids[] = {
+ {
+ .compatible = "st,stm32h7-spdifrx",
+ .data = &stm32_h7_spdifrx_regmap_conf
+ },
+ {}
+};
+
+static int stm_spdifrx_parse_of(struct platform_device *pdev,
+ struct stm32_spdifrx_data *spdifrx)
+{
+ struct device_node *np = pdev->dev.of_node;
+ const struct of_device_id *of_id;
+ struct resource *res;
+
+ if (!np)
+ return -ENODEV;
+
+ of_id = of_match_device(stm32_spdifrx_ids, &pdev->dev);
+ if (of_id)
+ spdifrx->regmap_conf =
+ (const struct regmap_config *)of_id->data;
+ else
+ return -EINVAL;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ spdifrx->base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(spdifrx->base))
+ return PTR_ERR(spdifrx->base);
+
+ spdifrx->phys_addr = res->start;
+
+ spdifrx->kclk = devm_clk_get(&pdev->dev, "kclk");
+ if (IS_ERR(spdifrx->kclk)) {
+ dev_err(&pdev->dev, "Could not get kclk\n");
+ return PTR_ERR(spdifrx->kclk);
+ }
+
+ spdifrx->irq = platform_get_irq(pdev, 0);
+ if (spdifrx->irq < 0) {
+ dev_err(&pdev->dev, "No irq for node %s\n", pdev->name);
+ return spdifrx->irq;
+ }
+
+ return 0;
+}
+
+static int stm32_spdifrx_probe(struct platform_device *pdev)
+{
+ struct stm32_spdifrx_data *spdifrx;
+ struct reset_control *rst;
+ const struct snd_dmaengine_pcm_config *pcm_config = NULL;
+ int ret;
+
+ spdifrx = devm_kzalloc(&pdev->dev, sizeof(*spdifrx), GFP_KERNEL);
+ if (!spdifrx)
+ return -ENOMEM;
+
+ spdifrx->pdev = pdev;
+ init_completion(&spdifrx->cs_completion);
+ spin_lock_init(&spdifrx->lock);
+
+ platform_set_drvdata(pdev, spdifrx);
+
+ ret = stm_spdifrx_parse_of(pdev, spdifrx);
+ if (ret)
+ return ret;
+
+ spdifrx->regmap = devm_regmap_init_mmio_clk(&pdev->dev, "kclk",
+ spdifrx->base,
+ spdifrx->regmap_conf);
+ if (IS_ERR(spdifrx->regmap)) {
+ dev_err(&pdev->dev, "Regmap init failed\n");
+ return PTR_ERR(spdifrx->regmap);
+ }
+
+ ret = devm_request_irq(&pdev->dev, spdifrx->irq, stm32_spdifrx_isr, 0,
+ dev_name(&pdev->dev), spdifrx);
+ if (ret) {
+ dev_err(&pdev->dev, "IRQ request returned %d\n", ret);
+ return ret;
+ }
+
+ rst = devm_reset_control_get(&pdev->dev, NULL);
+ if (!IS_ERR(rst)) {
+ reset_control_assert(rst);
+ udelay(2);
+ reset_control_deassert(rst);
+ }
+
+ ret = devm_snd_soc_register_component(&pdev->dev,
+ &stm32_spdifrx_component,
+ stm32_spdifrx_dai,
+ ARRAY_SIZE(stm32_spdifrx_dai));
+ if (ret)
+ return ret;
+
+ ret = stm32_spdifrx_dma_ctrl_register(&pdev->dev, spdifrx);
+ if (ret)
+ goto error;
+
+ pcm_config = &stm32_spdifrx_pcm_config;
+ ret = devm_snd_dmaengine_pcm_register(&pdev->dev, pcm_config, 0);
+ if (ret) {
+ dev_err(&pdev->dev, "PCM DMA register returned %d\n", ret);
+ goto error;
+ }
+
+ return 0;
+
+error:
+ if (spdifrx->ctrl_chan)
+ dma_release_channel(spdifrx->ctrl_chan);
+ if (spdifrx->dmab)
+ snd_dma_free_pages(spdifrx->dmab);
+
+ return ret;
+}
+
+static int stm32_spdifrx_remove(struct platform_device *pdev)
+{
+ struct stm32_spdifrx_data *spdifrx = platform_get_drvdata(pdev);
+
+ if (spdifrx->ctrl_chan)
+ dma_release_channel(spdifrx->ctrl_chan);
+
+ if (spdifrx->dmab)
+ snd_dma_free_pages(spdifrx->dmab);
+
+ return 0;
+}
+
+MODULE_DEVICE_TABLE(of, stm32_spdifrx_ids);
+
+static struct platform_driver stm32_spdifrx_driver = {
+ .driver = {
+ .name = "st,stm32-spdifrx",
+ .of_match_table = stm32_spdifrx_ids,
+ },
+ .probe = stm32_spdifrx_probe,
+ .remove = stm32_spdifrx_remove,
+};
+
+module_platform_driver(stm32_spdifrx_driver);
+
+MODULE_DESCRIPTION("STM32 Soc spdifrx Interface");
+MODULE_AUTHOR("Olivier Moysan, <olivier.moysan@xxxxxx>");
+MODULE_ALIAS("platform:stm32-spdifrx");
+MODULE_LICENSE("GPL v2");
--
1.9.1