[PATCH v4 2/2] ASoC: mchp-spdiftx: add driver for S/PDIF TX Controller
Codrin Ciubotariu
codrin.ciubotariu at microchip.com
Wed Sep 9 10:53:48 EDT 2020
The new SPDIF TX controller is a serial port compliant with the IEC-
60958 standard. It also supports programmable User Data and Channel
Status fields.
This IP is embedded in Microchip's sama7g5 SoC.
Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu at microchip.com>
---
Changes in v4:
- moved enable/disable of pclk clock from DAI startup/shutdown ops to
probe/remove callbacks;
- removed extra newline;
- added comment description for spinlock;
Changes in v2,v3:
- none
sound/soc/atmel/Kconfig | 12 +
sound/soc/atmel/Makefile | 2 +
sound/soc/atmel/mchp-spdiftx.c | 871 +++++++++++++++++++++++++++++++++
3 files changed, 885 insertions(+)
create mode 100644 sound/soc/atmel/mchp-spdiftx.c
diff --git a/sound/soc/atmel/Kconfig b/sound/soc/atmel/Kconfig
index 71f2d42188c4..93beb7d670a3 100644
--- a/sound/soc/atmel/Kconfig
+++ b/sound/soc/atmel/Kconfig
@@ -132,4 +132,16 @@ config SND_MCHP_SOC_I2S_MCC
and supports a Time Division Multiplexed (TDM) interface with
external multi-channel audio codecs.
+config SND_MCHP_SOC_SPDIFTX
+ tristate "Microchip ASoC driver for boards using S/PDIF TX"
+ depends on OF && (ARCH_AT91 || COMPILE_TEST)
+ select SND_SOC_GENERIC_DMAENGINE_PCM
+ select REGMAP_MMIO
+ help
+ Say Y or M if you want to add support for Microchip S/PDIF TX ASoc
+ driver on the following Microchip platforms:
+ - sama7g5
+
+ This S/PDIF TX driver is compliant with IEC-60958 standard and
+ includes programable User Data and Channel Status fields.
endif
diff --git a/sound/soc/atmel/Makefile b/sound/soc/atmel/Makefile
index c7d2989791be..3fd89a0063df 100644
--- a/sound/soc/atmel/Makefile
+++ b/sound/soc/atmel/Makefile
@@ -5,6 +5,7 @@ snd-soc-atmel-pcm-dma-objs := atmel-pcm-dma.o
snd-soc-atmel_ssc_dai-objs := atmel_ssc_dai.o
snd-soc-atmel-i2s-objs := atmel-i2s.o
snd-soc-mchp-i2s-mcc-objs := mchp-i2s-mcc.o
+snd-soc-mchp-spdiftx-objs := mchp-spdiftx.o
# pdc and dma need to both be built-in if any user of
# ssc is built-in.
@@ -17,6 +18,7 @@ endif
obj-$(CONFIG_SND_ATMEL_SOC_SSC) += snd-soc-atmel_ssc_dai.o
obj-$(CONFIG_SND_ATMEL_SOC_I2S) += snd-soc-atmel-i2s.o
obj-$(CONFIG_SND_MCHP_SOC_I2S_MCC) += snd-soc-mchp-i2s-mcc.o
+obj-$(CONFIG_SND_MCHP_SOC_SPDIFTX) += snd-soc-mchp-spdiftx.o
# AT91 Machine Support
snd-soc-sam9g20-wm8731-objs := sam9g20_wm8731.o
diff --git a/sound/soc/atmel/mchp-spdiftx.c b/sound/soc/atmel/mchp-spdiftx.c
new file mode 100644
index 000000000000..36c23eb3a5ad
--- /dev/null
+++ b/sound/soc/atmel/mchp-spdiftx.c
@@ -0,0 +1,871 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Driver for Microchip S/PDIF TX Controller
+//
+// Copyright (C) 2020 Microchip Technology Inc. and its subsidiaries
+//
+// Author: Codrin Ciubotariu <codrin.ciubotariu at microchip.com>
+
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/spinlock.h>
+
+#include <sound/asoundef.h>
+#include <sound/dmaengine_pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+
+/*
+ * ---- S/PDIF Transmitter Controller Register map ----
+ */
+#define SPDIFTX_CR 0x00 /* Control Register */
+#define SPDIFTX_MR 0x04 /* Mode Register */
+#define SPDIFTX_CDR 0x0C /* Common Data Register */
+
+#define SPDIFTX_IER 0x14 /* Interrupt Enable Register */
+#define SPDIFTX_IDR 0x18 /* Interrupt Disable Register */
+#define SPDIFTX_IMR 0x1C /* Interrupt Mask Register */
+#define SPDIFTX_ISR 0x20 /* Interrupt Status Register */
+
+#define SPDIFTX_CH1UD(reg) (0x50 + (reg) * 4) /* User Data 1 Register x */
+#define SPDIFTX_CH1S(reg) (0x80 + (reg) * 4) /* Channel Status 1 Register x */
+
+#define SPDIFTX_VERSION 0xF0
+
+/*
+ * ---- Control Register (Write-only) ----
+ */
+#define SPDIFTX_CR_SWRST BIT(0) /* Software Reset */
+#define SPDIFTX_CR_FCLR BIT(1) /* FIFO clear */
+
+/*
+ * ---- Mode Register (Read/Write) ----
+ */
+/* Transmit Enable */
+#define SPDIFTX_MR_TXEN_MASK GENMASK(0, 0)
+#define SPDIFTX_MR_TXEN_DISABLE (0 << 0)
+#define SPDIFTX_MR_TXEN_ENABLE (1 << 0)
+
+/* Multichannel Transfer */
+#define SPDIFTX_MR_MULTICH_MASK GENAMSK(1, 1)
+#define SPDIFTX_MR_MULTICH_MONO (0 << 1)
+#define SPDIFTX_MR_MULTICH_DUAL (1 << 1)
+
+/* Data Word Endian Mode */
+#define SPDIFTX_MR_ENDIAN_MASK GENMASK(2, 2)
+#define SPDIFTX_MR_ENDIAN_LITTLE (0 << 2)
+#define SPDIFTX_MR_ENDIAN_BIG (1 << 2)
+
+/* Data Justification */
+#define SPDIFTX_MR_JUSTIFY_MASK GENMASK(3, 3)
+#define SPDIFTX_MR_JUSTIFY_LSB (0 << 3)
+#define SPDIFTX_MR_JUSTIFY_MSB (1 << 3)
+
+/* Common Audio Register Transfer Mode */
+#define SPDIFTX_MR_CMODE_MASK GENMASK(5, 4)
+#define SPDIFTX_MR_CMODE_INDEX_ACCESS (0 << 4)
+#define SPDIFTX_MR_CMODE_TOGGLE_ACCESS (1 << 4)
+#define SPDIFTX_MR_CMODE_INTERLVD_ACCESS (2 << 4)
+
+/* Valid Bits per Sample */
+#define SPDIFTX_MR_VBPS_MASK GENMASK(13, 8)
+#define SPDIFTX_MR_VBPS(bps) (((bps) << 8) & SPDIFTX_MR_VBPS_MASK)
+
+/* Chunk Size */
+#define SPDIFTX_MR_CHUNK_MASK GENMASK(19, 16)
+#define SPDIFTX_MR_CHUNK(size) (((size) << 16) & SPDIFTX_MR_CHUNK_MASK)
+
+/* Validity Bits for Channels 1 and 2 */
+#define SPDIFTX_MR_VALID1 BIT(24)
+#define SPDIFTX_MR_VALID2 BIT(25)
+
+/* Disable Null Frame on underrrun */
+#define SPDIFTX_MR_DNFR_MASK GENMASK(27, 27)
+#define SPDIFTX_MR_DNFR_INVALID (0 << 27)
+#define SPDIFTX_MR_DNFR_VALID (1 << 27)
+
+/* Bytes per Sample */
+#define SPDIFTX_MR_BPS_MASK GENMASK(29, 28)
+#define SPDIFTX_MR_BPS(bytes) \
+ ((((bytes) - 1) << 28) & SPDIFTX_MR_BPS_MASK)
+
+/*
+ * ---- Interrupt Enable/Disable/Mask/Status Register (Write/Read-only) ----
+ */
+#define SPDIFTX_IR_TXRDY BIT(0)
+#define SPDIFTX_IR_TXEMPTY BIT(1)
+#define SPDIFTX_IR_TXFULL BIT(2)
+#define SPDIFTX_IR_TXCHUNK BIT(3)
+#define SPDIFTX_IR_TXUDR BIT(4)
+#define SPDIFTX_IR_TXOVR BIT(5)
+#define SPDIFTX_IR_CSRDY BIT(6)
+#define SPDIFTX_IR_UDRDY BIT(7)
+#define SPDIFTX_IR_TXRDYCH(ch) BIT((ch) + 8)
+#define SPDIFTX_IR_SECE BIT(10)
+#define SPDIFTX_IR_TXUDRCH(ch) BIT((ch) + 11)
+#define SPDIFTX_IR_BEND BIT(13)
+
+static bool mchp_spdiftx_readable_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case SPDIFTX_MR:
+ case SPDIFTX_IMR:
+ case SPDIFTX_ISR:
+ case SPDIFTX_CH1UD(0):
+ case SPDIFTX_CH1UD(1):
+ case SPDIFTX_CH1UD(2):
+ case SPDIFTX_CH1UD(3):
+ case SPDIFTX_CH1UD(4):
+ case SPDIFTX_CH1UD(5):
+ case SPDIFTX_CH1S(0):
+ case SPDIFTX_CH1S(1):
+ case SPDIFTX_CH1S(2):
+ case SPDIFTX_CH1S(3):
+ case SPDIFTX_CH1S(4):
+ case SPDIFTX_CH1S(5):
+ return true;
+ default:
+ return false;
+ }
+}
+
+static bool mchp_spdiftx_writeable_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case SPDIFTX_CR:
+ case SPDIFTX_MR:
+ case SPDIFTX_CDR:
+ case SPDIFTX_IER:
+ case SPDIFTX_IDR:
+ case SPDIFTX_CH1UD(0):
+ case SPDIFTX_CH1UD(1):
+ case SPDIFTX_CH1UD(2):
+ case SPDIFTX_CH1UD(3):
+ case SPDIFTX_CH1UD(4):
+ case SPDIFTX_CH1UD(5):
+ case SPDIFTX_CH1S(0):
+ case SPDIFTX_CH1S(1):
+ case SPDIFTX_CH1S(2):
+ case SPDIFTX_CH1S(3):
+ case SPDIFTX_CH1S(4):
+ case SPDIFTX_CH1S(5):
+ return true;
+ default:
+ return false;
+ }
+}
+
+static bool mchp_spdiftx_precious_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case SPDIFTX_CDR:
+ case SPDIFTX_ISR:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static const struct regmap_config mchp_spdiftx_regmap_config = {
+ .reg_bits = 32,
+ .reg_stride = 4,
+ .val_bits = 32,
+ .max_register = SPDIFTX_VERSION,
+ .readable_reg = mchp_spdiftx_readable_reg,
+ .writeable_reg = mchp_spdiftx_writeable_reg,
+ .precious_reg = mchp_spdiftx_precious_reg,
+};
+
+#define SPDIFTX_GCLK_RATIO 128
+
+#define SPDIFTX_CS_BITS 192
+#define SPDIFTX_UD_BITS 192
+
+struct mchp_spdiftx_mixer_control {
+ unsigned char ch_stat[SPDIFTX_CS_BITS / 8];
+ unsigned char user_data[SPDIFTX_UD_BITS / 8];
+ spinlock_t lock; /* exclusive access to control data */
+};
+
+struct mchp_spdiftx_dev {
+ struct mchp_spdiftx_mixer_control control;
+ struct snd_dmaengine_dai_dma_data playback;
+ struct device *dev;
+ struct regmap *regmap;
+ struct clk *pclk;
+ struct clk *gclk;
+ unsigned int fmt;
+ const struct mchp_i2s_caps *caps;
+ int gclk_enabled:1;
+};
+
+static inline int mchp_spdiftx_is_running(struct mchp_spdiftx_dev *dev)
+{
+ u32 mr;
+
+ regmap_read(dev->regmap, SPDIFTX_MR, &mr);
+ return !!(mr & SPDIFTX_MR_TXEN_ENABLE);
+}
+
+static void mchp_spdiftx_channel_status_write(struct mchp_spdiftx_dev *dev)
+{
+ struct mchp_spdiftx_mixer_control *ctrl = &dev->control;
+ u32 val;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(ctrl->ch_stat) / 4; i++) {
+ val = (ctrl->ch_stat[(i * 4) + 0] << 0) |
+ (ctrl->ch_stat[(i * 4) + 1] << 8) |
+ (ctrl->ch_stat[(i * 4) + 2] << 16) |
+ (ctrl->ch_stat[(i * 4) + 3] << 24);
+
+ regmap_write(dev->regmap, SPDIFTX_CH1S(i), val);
+ }
+}
+
+static void mchp_spdiftx_user_data_write(struct mchp_spdiftx_dev *dev)
+{
+ struct mchp_spdiftx_mixer_control *ctrl = &dev->control;
+ u32 val;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(ctrl->user_data) / 4; i++) {
+ val = (ctrl->user_data[(i * 4) + 0] << 0) |
+ (ctrl->user_data[(i * 4) + 1] << 8) |
+ (ctrl->user_data[(i * 4) + 2] << 16) |
+ (ctrl->user_data[(i * 4) + 3] << 24);
+
+ regmap_write(dev->regmap, SPDIFTX_CH1UD(i), val);
+ }
+}
+
+static irqreturn_t mchp_spdiftx_interrupt(int irq, void *dev_id)
+{
+ struct mchp_spdiftx_dev *dev = dev_id;
+ struct mchp_spdiftx_mixer_control *ctrl = &dev->control;
+ u32 sr, imr, pending, idr = 0;
+
+ regmap_read(dev->regmap, SPDIFTX_ISR, &sr);
+ regmap_read(dev->regmap, SPDIFTX_IMR, &imr);
+ pending = sr & imr;
+
+ if (!pending)
+ return IRQ_NONE;
+
+ if (pending & SPDIFTX_IR_TXUDR) {
+ dev_warn(dev->dev, "underflow detected\n");
+ idr |= SPDIFTX_IR_TXUDR;
+ }
+
+ if (pending & SPDIFTX_IR_TXOVR) {
+ dev_warn(dev->dev, "overflow detected\n");
+ idr |= SPDIFTX_IR_TXOVR;
+ }
+
+ if (pending & SPDIFTX_IR_UDRDY) {
+ spin_lock(&ctrl->lock);
+ mchp_spdiftx_user_data_write(dev);
+ spin_unlock(&ctrl->lock);
+ idr |= SPDIFTX_IR_UDRDY;
+ }
+
+ if (pending & SPDIFTX_IR_CSRDY) {
+ spin_lock(&ctrl->lock);
+ mchp_spdiftx_channel_status_write(dev);
+ spin_unlock(&ctrl->lock);
+ idr |= SPDIFTX_IR_CSRDY;
+ }
+
+ regmap_write(dev->regmap, SPDIFTX_IDR, idr);
+
+ return IRQ_HANDLED;
+}
+
+static int mchp_spdiftx_dai_startup(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *dai)
+{
+ struct mchp_spdiftx_dev *dev = snd_soc_dai_get_drvdata(dai);
+
+ /* Software reset the IP */
+ regmap_write(dev->regmap, SPDIFTX_CR,
+ SPDIFTX_CR_SWRST | SPDIFTX_CR_FCLR);
+
+ return 0;
+}
+
+static void mchp_spdiftx_dai_shutdown(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *dai)
+{
+ struct mchp_spdiftx_dev *dev = snd_soc_dai_get_drvdata(dai);
+
+ /* Disable interrupts */
+ regmap_write(dev->regmap, SPDIFTX_IDR, 0xffffffff);
+}
+
+static int mchp_spdiftx_trigger(struct snd_pcm_substream *substream, int cmd,
+ struct snd_soc_dai *dai)
+{
+ struct mchp_spdiftx_dev *dev = snd_soc_dai_get_drvdata(dai);
+ struct mchp_spdiftx_mixer_control *ctrl = &dev->control;
+ u32 mr;
+ int running;
+ int ret;
+
+ /* do not start/stop while channel status or user data is updated */
+ spin_lock(&ctrl->lock);
+ regmap_read(dev->regmap, SPDIFTX_MR, &mr);
+ running = !!(mr & SPDIFTX_MR_TXEN_ENABLE);
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ case SNDRV_PCM_TRIGGER_RESUME:
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ if (!running) {
+ mr &= ~SPDIFTX_MR_TXEN_MASK;
+ mr |= SPDIFTX_MR_TXEN_ENABLE;
+ }
+ break;
+ case SNDRV_PCM_TRIGGER_STOP:
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ if (running) {
+ mr &= ~SPDIFTX_MR_TXEN_MASK;
+ mr |= SPDIFTX_MR_TXEN_DISABLE;
+ }
+ break;
+ default:
+ spin_unlock(&ctrl->lock);
+ return -EINVAL;
+ }
+
+ ret = regmap_write(dev->regmap, SPDIFTX_MR, mr);
+ spin_unlock(&ctrl->lock);
+ if (ret) {
+ dev_err(dev->dev, "unable to disable TX: %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int mchp_spdiftx_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params,
+ struct snd_soc_dai *dai)
+{
+ unsigned long flags;
+ struct mchp_spdiftx_dev *dev = snd_soc_dai_get_drvdata(dai);
+ struct mchp_spdiftx_mixer_control *ctrl = &dev->control;
+ u32 mr;
+ unsigned int bps = params_physical_width(params) / 8;
+ int ret;
+
+ dev_dbg(dev->dev, "%s() rate=%u format=%#x width=%u channels=%u\n",
+ __func__, params_rate(params), params_format(params),
+ params_width(params), params_channels(params));
+
+ if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
+ dev_err(dev->dev, "Capture is not supported\n");
+ return -EINVAL;
+ }
+
+ regmap_read(dev->regmap, SPDIFTX_MR, &mr);
+
+ if (mr & SPDIFTX_MR_TXEN_ENABLE) {
+ dev_err(dev->dev, "PCM already running\n");
+ return -EBUSY;
+ }
+
+ /* Defaults: Toggle mode, justify to LSB, chunksize 1 */
+ mr = SPDIFTX_MR_CMODE_TOGGLE_ACCESS | SPDIFTX_MR_JUSTIFY_LSB;
+ dev->playback.maxburst = 1;
+ switch (params_channels(params)) {
+ case 1:
+ mr |= SPDIFTX_MR_MULTICH_MONO;
+ break;
+ case 2:
+ mr |= SPDIFTX_MR_MULTICH_DUAL;
+ if (bps > 2)
+ dev->playback.maxburst = 2;
+ break;
+ default:
+ dev_err(dev->dev, "unsupported number of channels: %d\n",
+ params_channels(params));
+ return -EINVAL;
+ }
+ mr |= SPDIFTX_MR_CHUNK(dev->playback.maxburst);
+
+ switch (params_format(params)) {
+ case SNDRV_PCM_FORMAT_S8:
+ mr |= SPDIFTX_MR_VBPS(8);
+ break;
+ case SNDRV_PCM_FORMAT_S16_BE:
+ mr |= SPDIFTX_MR_ENDIAN_BIG;
+ fallthrough;
+ case SNDRV_PCM_FORMAT_S16_LE:
+ mr |= SPDIFTX_MR_VBPS(16);
+ break;
+ case SNDRV_PCM_FORMAT_S18_3BE:
+ mr |= SPDIFTX_MR_ENDIAN_BIG;
+ fallthrough;
+ case SNDRV_PCM_FORMAT_S18_3LE:
+ mr |= SPDIFTX_MR_VBPS(18);
+ break;
+ case SNDRV_PCM_FORMAT_S20_3BE:
+ mr |= SPDIFTX_MR_ENDIAN_BIG;
+ fallthrough;
+ case SNDRV_PCM_FORMAT_S20_3LE:
+ mr |= SPDIFTX_MR_VBPS(20);
+ break;
+ case SNDRV_PCM_FORMAT_S24_3BE:
+ mr |= SPDIFTX_MR_ENDIAN_BIG;
+ fallthrough;
+ case SNDRV_PCM_FORMAT_S24_3LE:
+ mr |= SPDIFTX_MR_VBPS(24);
+ break;
+ case SNDRV_PCM_FORMAT_S24_BE:
+ mr |= SPDIFTX_MR_ENDIAN_BIG;
+ fallthrough;
+ case SNDRV_PCM_FORMAT_S24_LE:
+ mr |= SPDIFTX_MR_VBPS(24);
+ break;
+ case SNDRV_PCM_FORMAT_S32_BE:
+ mr |= SPDIFTX_MR_ENDIAN_BIG;
+ fallthrough;
+ case SNDRV_PCM_FORMAT_S32_LE:
+ mr |= SPDIFTX_MR_VBPS(32);
+ break;
+ default:
+ dev_err(dev->dev, "unsupported PCM format: %d\n",
+ params_format(params));
+ return -EINVAL;
+ }
+
+ mr |= SPDIFTX_MR_BPS(bps);
+
+ spin_lock_irqsave(&ctrl->lock, flags);
+ ctrl->ch_stat[3] &= ~IEC958_AES3_CON_FS;
+ switch (params_rate(params)) {
+ case 22050:
+ ctrl->ch_stat[3] |= IEC958_AES3_CON_FS_22050;
+ break;
+ case 24000:
+ ctrl->ch_stat[3] |= IEC958_AES3_CON_FS_24000;
+ break;
+ case 32000:
+ ctrl->ch_stat[3] |= IEC958_AES3_CON_FS_32000;
+ break;
+ case 44100:
+ ctrl->ch_stat[3] |= IEC958_AES3_CON_FS_44100;
+ break;
+ case 48000:
+ ctrl->ch_stat[3] |= IEC958_AES3_CON_FS_48000;
+ break;
+ case 88200:
+ ctrl->ch_stat[3] |= IEC958_AES3_CON_FS_88200;
+ break;
+ case 96000:
+ ctrl->ch_stat[3] |= IEC958_AES3_CON_FS_96000;
+ break;
+ case 176400:
+ ctrl->ch_stat[3] |= IEC958_AES3_CON_FS_176400;
+ break;
+ case 192000:
+ ctrl->ch_stat[3] |= IEC958_AES3_CON_FS_192000;
+ break;
+ case 8000:
+ case 11025:
+ case 16000:
+ case 64000:
+ ctrl->ch_stat[3] |= IEC958_AES3_CON_FS_NOTID;
+ break;
+ default:
+ dev_err(dev->dev, "unsupported sample frequency: %u\n",
+ params_rate(params));
+ spin_unlock_irqrestore(&ctrl->lock, flags);
+ return -EINVAL;
+ }
+ mchp_spdiftx_channel_status_write(dev);
+ spin_unlock_irqrestore(&ctrl->lock, flags);
+ mr |= SPDIFTX_MR_VALID1 | SPDIFTX_MR_VALID2;
+
+ if (dev->gclk_enabled) {
+ clk_disable_unprepare(dev->gclk);
+ dev->gclk_enabled = 0;
+ }
+ ret = clk_set_rate(dev->gclk, params_rate(params) *
+ SPDIFTX_GCLK_RATIO);
+ if (ret) {
+ dev_err(dev->dev,
+ "unable to change gclk rate to: rate %u * ratio %u\n",
+ params_rate(params), SPDIFTX_GCLK_RATIO);
+ return ret;
+ }
+ ret = clk_prepare_enable(dev->gclk);
+ if (ret) {
+ dev_err(dev->dev, "unable to enable gclk: %d\n", ret);
+ return ret;
+ }
+ dev->gclk_enabled = 1;
+ dev_dbg(dev->dev, "%s(): GCLK set to %d\n", __func__,
+ params_rate(params) * SPDIFTX_GCLK_RATIO);
+
+ /* Enable interrupts */
+ regmap_write(dev->regmap, SPDIFTX_IER,
+ SPDIFTX_IR_TXUDR | SPDIFTX_IR_TXOVR);
+
+ regmap_write(dev->regmap, SPDIFTX_MR, mr);
+
+ return 0;
+}
+
+static int mchp_spdiftx_hw_free(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *dai)
+{
+ struct mchp_spdiftx_dev *dev = snd_soc_dai_get_drvdata(dai);
+
+ regmap_write(dev->regmap, SPDIFTX_IDR,
+ SPDIFTX_IR_TXUDR | SPDIFTX_IR_TXOVR);
+ if (dev->gclk_enabled) {
+ clk_disable_unprepare(dev->gclk);
+ dev->gclk_enabled = 0;
+ }
+
+ return regmap_write(dev->regmap, SPDIFTX_CR,
+ SPDIFTX_CR_SWRST | SPDIFTX_CR_FCLR);
+}
+
+static const struct snd_soc_dai_ops mchp_spdiftx_dai_ops = {
+ .startup = mchp_spdiftx_dai_startup,
+ .shutdown = mchp_spdiftx_dai_shutdown,
+ .trigger = mchp_spdiftx_trigger,
+ .hw_params = mchp_spdiftx_hw_params,
+ .hw_free = mchp_spdiftx_hw_free,
+};
+
+#define MCHP_SPDIFTX_RATES SNDRV_PCM_RATE_8000_192000
+
+#define MCHP_SPDIFTX_FORMATS (SNDRV_PCM_FMTBIT_S8 | \
+ SNDRV_PCM_FMTBIT_S16_LE | \
+ SNDRV_PCM_FMTBIT_U16_BE | \
+ SNDRV_PCM_FMTBIT_S18_3LE | \
+ SNDRV_PCM_FMTBIT_S18_3BE | \
+ SNDRV_PCM_FMTBIT_S20_3LE | \
+ SNDRV_PCM_FMTBIT_S20_3BE | \
+ SNDRV_PCM_FMTBIT_S24_3LE | \
+ SNDRV_PCM_FMTBIT_S24_3BE | \
+ SNDRV_PCM_FMTBIT_S24_LE | \
+ SNDRV_PCM_FMTBIT_S24_BE | \
+ SNDRV_PCM_FMTBIT_S32_LE | \
+ SNDRV_PCM_FMTBIT_S32_BE \
+ )
+
+static int mchp_spdiftx_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 mchp_spdiftx_cs_get(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *uvalue)
+{
+ unsigned long flags;
+ struct snd_soc_dai *dai = snd_kcontrol_chip(kcontrol);
+ struct mchp_spdiftx_dev *dev = snd_soc_dai_get_drvdata(dai);
+ struct mchp_spdiftx_mixer_control *ctrl = &dev->control;
+
+ spin_lock_irqsave(&ctrl->lock, flags);
+ memcpy(uvalue->value.iec958.status, ctrl->ch_stat,
+ sizeof(ctrl->ch_stat));
+ spin_unlock_irqrestore(&ctrl->lock, flags);
+
+ return 0;
+}
+
+static int mchp_spdiftx_cs_put(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *uvalue)
+{
+ unsigned long flags;
+ struct snd_soc_dai *dai = snd_kcontrol_chip(kcontrol);
+ struct mchp_spdiftx_dev *dev = snd_soc_dai_get_drvdata(dai);
+ struct mchp_spdiftx_mixer_control *ctrl = &dev->control;
+ int changed = 0;
+ int i;
+
+ spin_lock_irqsave(&ctrl->lock, flags);
+ for (i = 0; i < ARRAY_SIZE(ctrl->ch_stat); i++) {
+ if (ctrl->ch_stat[i] != uvalue->value.iec958.status[i])
+ changed = 1;
+ ctrl->ch_stat[i] = uvalue->value.iec958.status[i];
+ }
+
+ if (changed) {
+ /* don't enable IP while we copy the channel status */
+ if (mchp_spdiftx_is_running(dev)) {
+ /*
+ * if SPDIF is running, wait for interrupt to write
+ * channel status
+ */
+ regmap_write(dev->regmap, SPDIFTX_IER,
+ SPDIFTX_IR_CSRDY);
+ } else {
+ mchp_spdiftx_channel_status_write(dev);
+ }
+ }
+ spin_unlock_irqrestore(&ctrl->lock, flags);
+
+ return changed;
+}
+
+static int mchp_spdiftx_cs_mask(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *uvalue)
+{
+ memset(uvalue->value.iec958.status, 0xff,
+ sizeof(uvalue->value.iec958.status));
+
+ return 0;
+}
+
+static int mchp_spdiftx_subcode_get(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *uvalue)
+{
+ struct snd_soc_dai *dai = snd_kcontrol_chip(kcontrol);
+ struct mchp_spdiftx_dev *dev = snd_soc_dai_get_drvdata(dai);
+ struct mchp_spdiftx_mixer_control *ctrl = &dev->control;
+ unsigned long flags;
+
+ spin_lock_irqsave(&ctrl->lock, flags);
+ memcpy(uvalue->value.iec958.subcode, ctrl->user_data,
+ sizeof(ctrl->user_data));
+ spin_unlock_irqrestore(&ctrl->lock, flags);
+
+ return 0;
+}
+
+static int mchp_spdiftx_subcode_put(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *uvalue)
+{
+ unsigned long flags;
+ struct snd_soc_dai *dai = snd_kcontrol_chip(kcontrol);
+ struct mchp_spdiftx_dev *dev = snd_soc_dai_get_drvdata(dai);
+ struct mchp_spdiftx_mixer_control *ctrl = &dev->control;
+ int changed = 0;
+ int i;
+
+ spin_lock_irqsave(&ctrl->lock, flags);
+ for (i = 0; i < ARRAY_SIZE(ctrl->user_data); i++) {
+ if (ctrl->user_data[i] != uvalue->value.iec958.subcode[i])
+ changed = 1;
+
+ ctrl->user_data[i] = uvalue->value.iec958.subcode[i];
+ }
+ if (changed) {
+ if (mchp_spdiftx_is_running(dev)) {
+ /*
+ * if SPDIF is running, wait for interrupt to write
+ * user data
+ */
+ regmap_write(dev->regmap, SPDIFTX_IER,
+ SPDIFTX_IR_UDRDY);
+ } else {
+ mchp_spdiftx_user_data_write(dev);
+ }
+ }
+ spin_unlock_irqrestore(&ctrl->lock, flags);
+
+ return changed;
+}
+
+static struct snd_kcontrol_new mchp_spdiftx_ctrls[] = {
+ /* Channel status controller */
+ {
+ .iface = SNDRV_CTL_ELEM_IFACE_PCM,
+ .name = SNDRV_CTL_NAME_IEC958("", PLAYBACK, DEFAULT),
+ .access = SNDRV_CTL_ELEM_ACCESS_READWRITE |
+ SNDRV_CTL_ELEM_ACCESS_VOLATILE,
+ .info = mchp_spdiftx_info,
+ .get = mchp_spdiftx_cs_get,
+ .put = mchp_spdiftx_cs_put,
+ },
+ {
+ .iface = SNDRV_CTL_ELEM_IFACE_PCM,
+ .name = SNDRV_CTL_NAME_IEC958("", PLAYBACK, MASK),
+ .access = SNDRV_CTL_ELEM_ACCESS_READ,
+ SNDRV_CTL_ELEM_ACCESS_VOLATILE,
+ .info = mchp_spdiftx_info,
+ .get = mchp_spdiftx_cs_mask,
+ },
+ /* User bits controller */
+ {
+ .iface = SNDRV_CTL_ELEM_IFACE_PCM,
+ .name = "IEC958 Subcode Playback Default",
+ .access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
+ .info = mchp_spdiftx_info,
+ .get = mchp_spdiftx_subcode_get,
+ .put = mchp_spdiftx_subcode_put,
+ },
+};
+
+static int mchp_spdiftx_dai_probe(struct snd_soc_dai *dai)
+{
+ struct mchp_spdiftx_dev *dev = snd_soc_dai_get_drvdata(dai);
+ int ret;
+
+ snd_soc_dai_init_dma_data(dai, &dev->playback, NULL);
+
+ ret = clk_prepare_enable(dev->pclk);
+ if (ret) {
+ dev_err(dev->dev,
+ "failed to enable the peripheral clock: %d\n", ret);
+ return ret;
+ }
+
+ /* Add controls */
+ snd_soc_add_dai_controls(dai, mchp_spdiftx_ctrls,
+ ARRAY_SIZE(mchp_spdiftx_ctrls));
+
+ return 0;
+}
+
+static int mchp_spdiftx_dai_remove(struct snd_soc_dai *dai)
+{
+ struct mchp_spdiftx_dev *dev = snd_soc_dai_get_drvdata(dai);
+
+ clk_disable_unprepare(dev->pclk);
+
+ return 0;
+}
+
+static struct snd_soc_dai_driver mchp_spdiftx_dai = {
+ .name = "mchp-spdiftx",
+ .probe = mchp_spdiftx_dai_probe,
+ .remove = mchp_spdiftx_dai_remove,
+ .playback = {
+ .stream_name = "S/PDIF TX Playback",
+ .channels_min = 1,
+ .channels_max = 2,
+ .rates = MCHP_SPDIFTX_RATES,
+ .formats = MCHP_SPDIFTX_FORMATS,
+ },
+ .ops = &mchp_spdiftx_dai_ops,
+};
+
+static const struct snd_soc_component_driver mchp_spdiftx_component = {
+ .name = "mchp-spdiftx",
+};
+
+static const struct of_device_id mchp_spdiftx_dt_ids[] = {
+ {
+ .compatible = "microchip,sama7g5-spdiftx",
+ },
+ { /* sentinel */ }
+};
+
+MODULE_DEVICE_TABLE(of, mchp_spdiftx_dt_ids);
+static int mchp_spdiftx_probe(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ const struct of_device_id *match;
+ struct mchp_spdiftx_dev *dev;
+ struct resource *mem;
+ struct regmap *regmap;
+ void __iomem *base;
+ struct mchp_spdiftx_mixer_control *ctrl;
+ int irq;
+ int err;
+
+ /* Get memory for driver data. */
+ dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
+ if (!dev)
+ return -ENOMEM;
+
+ /* Get hardware capabilities. */
+ match = of_match_node(mchp_spdiftx_dt_ids, np);
+ if (match)
+ dev->caps = match->data;
+
+ /* Map I/O registers. */
+ base = devm_platform_get_and_ioremap_resource(pdev, 0, &mem);
+ if (IS_ERR(base))
+ return PTR_ERR(base);
+
+ regmap = devm_regmap_init_mmio(&pdev->dev, base,
+ &mchp_spdiftx_regmap_config);
+ if (IS_ERR(regmap))
+ return PTR_ERR(regmap);
+
+ /* Request IRQ */
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0)
+ return irq;
+
+ err = devm_request_irq(&pdev->dev, irq, mchp_spdiftx_interrupt, 0,
+ dev_name(&pdev->dev), dev);
+ if (err)
+ return err;
+
+ /* Get the peripheral clock */
+ dev->pclk = devm_clk_get(&pdev->dev, "pclk");
+ if (IS_ERR(dev->pclk)) {
+ err = PTR_ERR(dev->pclk);
+ dev_err(&pdev->dev,
+ "failed to get the peripheral clock: %d\n", err);
+ return err;
+ }
+
+ /* Get the generic clock */
+ dev->gclk = devm_clk_get(&pdev->dev, "gclk");
+ if (IS_ERR(dev->gclk)) {
+ err = PTR_ERR(dev->gclk);
+ dev_err(&pdev->dev,
+ "failed to get the PMC generic clock: %d\n", err);
+ return err;
+ }
+
+ ctrl = &dev->control;
+ spin_lock_init(&ctrl->lock);
+
+ /* Init channel status */
+ ctrl->ch_stat[0] = IEC958_AES0_CON_NOT_COPYRIGHT |
+ IEC958_AES0_CON_EMPHASIS_NONE;
+
+ dev->dev = &pdev->dev;
+ dev->regmap = regmap;
+ platform_set_drvdata(pdev, dev);
+
+ dev->playback.addr = (dma_addr_t)mem->start + SPDIFTX_CDR;
+ dev->playback.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+
+ err = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
+ if (err) {
+ dev_err(&pdev->dev, "failed to register PMC: %d\n", err);
+ return err;
+ }
+
+ err = devm_snd_soc_register_component(&pdev->dev,
+ &mchp_spdiftx_component,
+ &mchp_spdiftx_dai, 1);
+ if (err) {
+ dev_err(&pdev->dev, "failed to register component: %d\n", err);
+ return err;
+ }
+
+ return 0;
+}
+
+static struct platform_driver mchp_spdiftx_driver = {
+ .probe = mchp_spdiftx_probe,
+ .driver = {
+ .name = "mchp_spdiftx",
+ .of_match_table = of_match_ptr(mchp_spdiftx_dt_ids),
+ },
+};
+
+module_platform_driver(mchp_spdiftx_driver);
+
+MODULE_AUTHOR("Codrin Ciubotariu <codrin.ciubotariu at microchip.com>");
+MODULE_DESCRIPTION("Microchip S/PDIF TX Controller Driver");
+MODULE_LICENSE("GPL v2");
--
2.25.1
More information about the linux-arm-kernel
mailing list