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-rw-r--r--sound/soc/atmel/mchp-spdifrx.c1061
1 files changed, 1061 insertions, 0 deletions
diff --git a/sound/soc/atmel/mchp-spdifrx.c b/sound/soc/atmel/mchp-spdifrx.c
new file mode 100644
index 000000000..76ce37f64
--- /dev/null
+++ b/sound/soc/atmel/mchp-spdifrx.c
@@ -0,0 +1,1061 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Driver for Microchip S/PDIF RX Controller
+//
+// Copyright (C) 2020 Microchip Technology Inc. and its subsidiaries
+//
+// Author: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
+
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/spinlock.h>
+
+#include <sound/dmaengine_pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+
+/*
+ * ---- S/PDIF Receiver Controller Register map ----
+ */
+#define SPDIFRX_CR 0x00 /* Control Register */
+#define SPDIFRX_MR 0x04 /* Mode Register */
+
+#define SPDIFRX_IER 0x10 /* Interrupt Enable Register */
+#define SPDIFRX_IDR 0x14 /* Interrupt Disable Register */
+#define SPDIFRX_IMR 0x18 /* Interrupt Mask Register */
+#define SPDIFRX_ISR 0x1c /* Interrupt Status Register */
+#define SPDIFRX_RSR 0x20 /* Status Register */
+#define SPDIFRX_RHR 0x24 /* Holding Register */
+
+#define SPDIFRX_CHSR(channel, reg) \
+ (0x30 + (channel) * 0x30 + (reg) * 4) /* Channel x Status Registers */
+
+#define SPDIFRX_CHUD(channel, reg) \
+ (0x48 + (channel) * 0x30 + (reg) * 4) /* Channel x User Data Registers */
+
+#define SPDIFRX_WPMR 0xE4 /* Write Protection Mode Register */
+#define SPDIFRX_WPSR 0xE8 /* Write Protection Status Register */
+
+#define SPDIFRX_VERSION 0xFC /* Version Register */
+
+/*
+ * ---- Control Register (Write-only) ----
+ */
+#define SPDIFRX_CR_SWRST BIT(0) /* Software Reset */
+
+/*
+ * ---- Mode Register (Read/Write) ----
+ */
+/* Receive Enable */
+#define SPDIFRX_MR_RXEN_MASK GENMASK(0, 0)
+#define SPDIFRX_MR_RXEN_DISABLE (0 << 0) /* SPDIF Receiver Disabled */
+#define SPDIFRX_MR_RXEN_ENABLE (1 << 0) /* SPDIF Receiver Enabled */
+
+/* Validity Bit Mode */
+#define SPDIFRX_MR_VBMODE_MASK GENAMSK(1, 1)
+#define SPDIFRX_MR_VBMODE_ALWAYS_LOAD \
+ (0 << 1) /* Load sample regardless of validity bit value */
+#define SPDIFRX_MR_VBMODE_DISCARD_IF_VB1 \
+ (1 << 1) /* Load sample only if validity bit is 0 */
+
+/* Data Word Endian Mode */
+#define SPDIFRX_MR_ENDIAN_MASK GENMASK(2, 2)
+#define SPDIFRX_MR_ENDIAN_LITTLE (0 << 2) /* Little Endian Mode */
+#define SPDIFRX_MR_ENDIAN_BIG (1 << 2) /* Big Endian Mode */
+
+/* Parity Bit Mode */
+#define SPDIFRX_MR_PBMODE_MASK GENMASK(3, 3)
+#define SPDIFRX_MR_PBMODE_PARCHECK (0 << 3) /* Parity Check Enabled */
+#define SPDIFRX_MR_PBMODE_NOPARCHECK (1 << 3) /* Parity Check Disabled */
+
+/* Sample Data Width */
+#define SPDIFRX_MR_DATAWIDTH_MASK GENMASK(5, 4)
+#define SPDIFRX_MR_DATAWIDTH(width) \
+ (((6 - (width) / 4) << 4) & SPDIFRX_MR_DATAWIDTH_MASK)
+
+/* Packed Data Mode in Receive Holding Register */
+#define SPDIFRX_MR_PACK_MASK GENMASK(7, 7)
+#define SPDIFRX_MR_PACK_DISABLED (0 << 7)
+#define SPDIFRX_MR_PACK_ENABLED (1 << 7)
+
+/* Start of Block Bit Mode */
+#define SPDIFRX_MR_SBMODE_MASK GENMASK(8, 8)
+#define SPDIFRX_MR_SBMODE_ALWAYS_LOAD (0 << 8)
+#define SPDIFRX_MR_SBMODE_DISCARD (1 << 8)
+
+/* Consecutive Preamble Error Threshold Automatic Restart */
+#define SPDIFRX_MR_AUTORST_MASK GENMASK(24, 24)
+#define SPDIFRX_MR_AUTORST_NOACTION (0 << 24)
+#define SPDIFRX_MR_AUTORST_UNLOCK_ON_PRE_ERR (1 << 24)
+
+/*
+ * ---- Interrupt Enable/Disable/Mask/Status Register (Write/Read-only) ----
+ */
+#define SPDIFRX_IR_RXRDY BIT(0)
+#define SPDIFRX_IR_LOCKED BIT(1)
+#define SPDIFRX_IR_LOSS BIT(2)
+#define SPDIFRX_IR_BLOCKEND BIT(3)
+#define SPDIFRX_IR_SFE BIT(4)
+#define SPDIFRX_IR_PAR_ERR BIT(5)
+#define SPDIFRX_IR_OVERRUN BIT(6)
+#define SPDIFRX_IR_RXFULL BIT(7)
+#define SPDIFRX_IR_CSC(ch) BIT((ch) + 8)
+#define SPDIFRX_IR_SECE BIT(10)
+#define SPDIFRX_IR_BLOCKST BIT(11)
+#define SPDIFRX_IR_NRZ_ERR BIT(12)
+#define SPDIFRX_IR_PRE_ERR BIT(13)
+#define SPDIFRX_IR_CP_ERR BIT(14)
+
+/*
+ * ---- Receiver Status Register (Read/Write) ----
+ */
+/* Enable Status */
+#define SPDIFRX_RSR_ULOCK BIT(0)
+#define SPDIFRX_RSR_BADF BIT(1)
+#define SPDIFRX_RSR_LOWF BIT(2)
+#define SPDIFRX_RSR_NOSIGNAL BIT(3)
+#define SPDIFRX_RSR_IFS_MASK GENMASK(27, 16)
+#define SPDIFRX_RSR_IFS(reg) \
+ (((reg) & SPDIFRX_RSR_IFS_MASK) >> 16)
+
+/*
+ * ---- Version Register (Read-only) ----
+ */
+#define SPDIFRX_VERSION_MASK GENMASK(11, 0)
+#define SPDIFRX_VERSION_MFN_MASK GENMASK(18, 16)
+#define SPDIFRX_VERSION_MFN(reg) (((reg) & SPDIFRX_VERSION_MFN_MASK) >> 16)
+
+static bool mchp_spdifrx_readable_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case SPDIFRX_MR:
+ case SPDIFRX_IMR:
+ case SPDIFRX_ISR:
+ case SPDIFRX_RSR:
+ case SPDIFRX_CHSR(0, 0):
+ case SPDIFRX_CHSR(0, 1):
+ case SPDIFRX_CHSR(0, 2):
+ case SPDIFRX_CHSR(0, 3):
+ case SPDIFRX_CHSR(0, 4):
+ case SPDIFRX_CHSR(0, 5):
+ case SPDIFRX_CHUD(0, 0):
+ case SPDIFRX_CHUD(0, 1):
+ case SPDIFRX_CHUD(0, 2):
+ case SPDIFRX_CHUD(0, 3):
+ case SPDIFRX_CHUD(0, 4):
+ case SPDIFRX_CHUD(0, 5):
+ case SPDIFRX_CHSR(1, 0):
+ case SPDIFRX_CHSR(1, 1):
+ case SPDIFRX_CHSR(1, 2):
+ case SPDIFRX_CHSR(1, 3):
+ case SPDIFRX_CHSR(1, 4):
+ case SPDIFRX_CHSR(1, 5):
+ case SPDIFRX_CHUD(1, 0):
+ case SPDIFRX_CHUD(1, 1):
+ case SPDIFRX_CHUD(1, 2):
+ case SPDIFRX_CHUD(1, 3):
+ case SPDIFRX_CHUD(1, 4):
+ case SPDIFRX_CHUD(1, 5):
+ case SPDIFRX_WPMR:
+ case SPDIFRX_WPSR:
+ case SPDIFRX_VERSION:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static bool mchp_spdifrx_writeable_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case SPDIFRX_CR:
+ case SPDIFRX_MR:
+ case SPDIFRX_IER:
+ case SPDIFRX_IDR:
+ case SPDIFRX_WPMR:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static bool mchp_spdifrx_precious_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case SPDIFRX_ISR:
+ case SPDIFRX_RHR:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static const struct regmap_config mchp_spdifrx_regmap_config = {
+ .reg_bits = 32,
+ .reg_stride = 4,
+ .val_bits = 32,
+ .max_register = SPDIFRX_VERSION,
+ .readable_reg = mchp_spdifrx_readable_reg,
+ .writeable_reg = mchp_spdifrx_writeable_reg,
+ .precious_reg = mchp_spdifrx_precious_reg,
+};
+
+#define SPDIFRX_GCLK_RATIO_MIN (12 * 64)
+
+#define SPDIFRX_CS_BITS 192
+#define SPDIFRX_UD_BITS 192
+
+#define SPDIFRX_CHANNELS 2
+
+struct mchp_spdifrx_ch_stat {
+ unsigned char data[SPDIFRX_CS_BITS / 8];
+ struct completion done;
+};
+
+struct mchp_spdifrx_user_data {
+ unsigned char data[SPDIFRX_UD_BITS / 8];
+ struct completion done;
+};
+
+struct mchp_spdifrx_mixer_control {
+ struct mchp_spdifrx_ch_stat ch_stat[SPDIFRX_CHANNELS];
+ struct mchp_spdifrx_user_data user_data[SPDIFRX_CHANNELS];
+ bool ulock;
+ bool badf;
+ bool signal;
+};
+
+struct mchp_spdifrx_dev {
+ struct snd_dmaengine_dai_dma_data capture;
+ struct mchp_spdifrx_mixer_control control;
+ struct mutex mlock;
+ struct device *dev;
+ struct regmap *regmap;
+ struct clk *pclk;
+ struct clk *gclk;
+ unsigned int fmt;
+ unsigned int trigger_enabled;
+ unsigned int gclk_enabled:1;
+};
+
+static void mchp_spdifrx_channel_status_read(struct mchp_spdifrx_dev *dev,
+ int channel)
+{
+ struct mchp_spdifrx_mixer_control *ctrl = &dev->control;
+ u8 *ch_stat = &ctrl->ch_stat[channel].data[0];
+ u32 val;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(ctrl->ch_stat[channel].data) / 4; i++) {
+ regmap_read(dev->regmap, SPDIFRX_CHSR(channel, i), &val);
+ *ch_stat++ = val & 0xFF;
+ *ch_stat++ = (val >> 8) & 0xFF;
+ *ch_stat++ = (val >> 16) & 0xFF;
+ *ch_stat++ = (val >> 24) & 0xFF;
+ }
+}
+
+static void mchp_spdifrx_channel_user_data_read(struct mchp_spdifrx_dev *dev,
+ int channel)
+{
+ struct mchp_spdifrx_mixer_control *ctrl = &dev->control;
+ u8 *user_data = &ctrl->user_data[channel].data[0];
+ u32 val;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(ctrl->user_data[channel].data) / 4; i++) {
+ regmap_read(dev->regmap, SPDIFRX_CHUD(channel, i), &val);
+ *user_data++ = val & 0xFF;
+ *user_data++ = (val >> 8) & 0xFF;
+ *user_data++ = (val >> 16) & 0xFF;
+ *user_data++ = (val >> 24) & 0xFF;
+ }
+}
+
+static irqreturn_t mchp_spdif_interrupt(int irq, void *dev_id)
+{
+ struct mchp_spdifrx_dev *dev = dev_id;
+ struct mchp_spdifrx_mixer_control *ctrl = &dev->control;
+ u32 sr, imr, pending;
+ irqreturn_t ret = IRQ_NONE;
+ int ch;
+
+ regmap_read(dev->regmap, SPDIFRX_ISR, &sr);
+ regmap_read(dev->regmap, SPDIFRX_IMR, &imr);
+ pending = sr & imr;
+ dev_dbg(dev->dev, "ISR: %#x, IMR: %#x, pending: %#x\n", sr, imr,
+ pending);
+
+ if (!pending)
+ return IRQ_NONE;
+
+ if (pending & SPDIFRX_IR_BLOCKEND) {
+ for (ch = 0; ch < SPDIFRX_CHANNELS; ch++) {
+ mchp_spdifrx_channel_user_data_read(dev, ch);
+ complete(&ctrl->user_data[ch].done);
+ }
+ regmap_write(dev->regmap, SPDIFRX_IDR, SPDIFRX_IR_BLOCKEND);
+ ret = IRQ_HANDLED;
+ }
+
+ for (ch = 0; ch < SPDIFRX_CHANNELS; ch++) {
+ if (pending & SPDIFRX_IR_CSC(ch)) {
+ mchp_spdifrx_channel_status_read(dev, ch);
+ complete(&ctrl->ch_stat[ch].done);
+ regmap_write(dev->regmap, SPDIFRX_IDR, SPDIFRX_IR_CSC(ch));
+ ret = IRQ_HANDLED;
+ }
+ }
+
+ if (pending & SPDIFRX_IR_OVERRUN) {
+ dev_warn(dev->dev, "Overrun detected\n");
+ ret = IRQ_HANDLED;
+ }
+
+ return ret;
+}
+
+static int mchp_spdifrx_trigger(struct snd_pcm_substream *substream, int cmd,
+ struct snd_soc_dai *dai)
+{
+ struct mchp_spdifrx_dev *dev = snd_soc_dai_get_drvdata(dai);
+ int ret = 0;
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ case SNDRV_PCM_TRIGGER_RESUME:
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ mutex_lock(&dev->mlock);
+ /* Enable overrun interrupts */
+ regmap_write(dev->regmap, SPDIFRX_IER, SPDIFRX_IR_OVERRUN);
+
+ /* Enable receiver. */
+ regmap_update_bits(dev->regmap, SPDIFRX_MR, SPDIFRX_MR_RXEN_MASK,
+ SPDIFRX_MR_RXEN_ENABLE);
+ dev->trigger_enabled = true;
+ mutex_unlock(&dev->mlock);
+ break;
+ case SNDRV_PCM_TRIGGER_STOP:
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ mutex_lock(&dev->mlock);
+ /* Disable overrun interrupts */
+ regmap_write(dev->regmap, SPDIFRX_IDR, SPDIFRX_IR_OVERRUN);
+
+ /* Disable receiver. */
+ regmap_update_bits(dev->regmap, SPDIFRX_MR, SPDIFRX_MR_RXEN_MASK,
+ SPDIFRX_MR_RXEN_DISABLE);
+ dev->trigger_enabled = false;
+ mutex_unlock(&dev->mlock);
+ break;
+ default:
+ ret = -EINVAL;
+ }
+
+ return ret;
+}
+
+static int mchp_spdifrx_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params,
+ struct snd_soc_dai *dai)
+{
+ struct mchp_spdifrx_dev *dev = snd_soc_dai_get_drvdata(dai);
+ u32 mr = 0;
+ 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_PLAYBACK) {
+ dev_err(dev->dev, "Playback is not supported\n");
+ return -EINVAL;
+ }
+
+ if (params_channels(params) != SPDIFRX_CHANNELS) {
+ dev_err(dev->dev, "unsupported number of channels: %d\n",
+ params_channels(params));
+ return -EINVAL;
+ }
+
+ switch (params_format(params)) {
+ case SNDRV_PCM_FORMAT_S16_BE:
+ case SNDRV_PCM_FORMAT_S20_3BE:
+ case SNDRV_PCM_FORMAT_S24_3BE:
+ case SNDRV_PCM_FORMAT_S24_BE:
+ mr |= SPDIFRX_MR_ENDIAN_BIG;
+ fallthrough;
+ case SNDRV_PCM_FORMAT_S16_LE:
+ case SNDRV_PCM_FORMAT_S20_3LE:
+ case SNDRV_PCM_FORMAT_S24_3LE:
+ case SNDRV_PCM_FORMAT_S24_LE:
+ mr |= SPDIFRX_MR_DATAWIDTH(params_width(params));
+ break;
+ default:
+ dev_err(dev->dev, "unsupported PCM format: %d\n",
+ params_format(params));
+ return -EINVAL;
+ }
+
+ mutex_lock(&dev->mlock);
+ if (dev->trigger_enabled) {
+ dev_err(dev->dev, "PCM already running\n");
+ ret = -EBUSY;
+ goto unlock;
+ }
+
+ if (dev->gclk_enabled) {
+ clk_disable_unprepare(dev->gclk);
+ dev->gclk_enabled = 0;
+ }
+ ret = clk_set_min_rate(dev->gclk, params_rate(params) *
+ SPDIFRX_GCLK_RATIO_MIN + 1);
+ if (ret) {
+ dev_err(dev->dev,
+ "unable to set gclk min rate: rate %u * ratio %u + 1\n",
+ params_rate(params), SPDIFRX_GCLK_RATIO_MIN);
+ goto unlock;
+ }
+ ret = clk_prepare_enable(dev->gclk);
+ if (ret) {
+ dev_err(dev->dev, "unable to enable gclk: %d\n", ret);
+ goto unlock;
+ }
+ dev->gclk_enabled = 1;
+
+ dev_dbg(dev->dev, "GCLK range min set to %d\n",
+ params_rate(params) * SPDIFRX_GCLK_RATIO_MIN + 1);
+
+ ret = regmap_write(dev->regmap, SPDIFRX_MR, mr);
+
+unlock:
+ mutex_unlock(&dev->mlock);
+
+ return ret;
+}
+
+static int mchp_spdifrx_hw_free(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *dai)
+{
+ struct mchp_spdifrx_dev *dev = snd_soc_dai_get_drvdata(dai);
+
+ mutex_lock(&dev->mlock);
+ if (dev->gclk_enabled) {
+ clk_disable_unprepare(dev->gclk);
+ dev->gclk_enabled = 0;
+ }
+ mutex_unlock(&dev->mlock);
+ return 0;
+}
+
+static const struct snd_soc_dai_ops mchp_spdifrx_dai_ops = {
+ .trigger = mchp_spdifrx_trigger,
+ .hw_params = mchp_spdifrx_hw_params,
+ .hw_free = mchp_spdifrx_hw_free,
+};
+
+#define MCHP_SPDIF_RATES SNDRV_PCM_RATE_8000_192000
+
+#define MCHP_SPDIF_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | \
+ SNDRV_PCM_FMTBIT_U16_BE | \
+ 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 \
+ )
+
+static int mchp_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 mchp_spdifrx_cs_get(struct mchp_spdifrx_dev *dev,
+ int channel,
+ struct snd_ctl_elem_value *uvalue)
+{
+ struct mchp_spdifrx_mixer_control *ctrl = &dev->control;
+ struct mchp_spdifrx_ch_stat *ch_stat = &ctrl->ch_stat[channel];
+ int ret = 0;
+
+ mutex_lock(&dev->mlock);
+
+ /*
+ * We may reach this point with both clocks enabled but the receiver
+ * still disabled. To void waiting for completion and return with
+ * timeout check the dev->trigger_enabled.
+ *
+ * To retrieve data:
+ * - if the receiver is enabled CSC IRQ will update the data in software
+ * caches (ch_stat->data)
+ * - otherwise we just update it here the software caches with latest
+ * available information and return it; in this case we don't need
+ * spin locking as the IRQ is disabled and will not be raised from
+ * anywhere else.
+ */
+
+ if (dev->trigger_enabled) {
+ reinit_completion(&ch_stat->done);
+ regmap_write(dev->regmap, SPDIFRX_IER, SPDIFRX_IR_CSC(channel));
+ /* Check for new data available */
+ ret = wait_for_completion_interruptible_timeout(&ch_stat->done,
+ msecs_to_jiffies(100));
+ /* Valid stream might not be present */
+ if (ret <= 0) {
+ dev_dbg(dev->dev, "channel status for channel %d timeout\n",
+ channel);
+ regmap_write(dev->regmap, SPDIFRX_IDR, SPDIFRX_IR_CSC(channel));
+ ret = ret ? : -ETIMEDOUT;
+ goto unlock;
+ } else {
+ ret = 0;
+ }
+ } else {
+ /* Update software cache with latest channel status. */
+ mchp_spdifrx_channel_status_read(dev, channel);
+ }
+
+ memcpy(uvalue->value.iec958.status, ch_stat->data,
+ sizeof(ch_stat->data));
+
+unlock:
+ mutex_unlock(&dev->mlock);
+ return ret;
+}
+
+static int mchp_spdifrx_cs1_get(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *uvalue)
+{
+ struct snd_soc_dai *dai = snd_kcontrol_chip(kcontrol);
+ struct mchp_spdifrx_dev *dev = snd_soc_dai_get_drvdata(dai);
+
+ return mchp_spdifrx_cs_get(dev, 0, uvalue);
+}
+
+static int mchp_spdifrx_cs2_get(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *uvalue)
+{
+ struct snd_soc_dai *dai = snd_kcontrol_chip(kcontrol);
+ struct mchp_spdifrx_dev *dev = snd_soc_dai_get_drvdata(dai);
+
+ return mchp_spdifrx_cs_get(dev, 1, uvalue);
+}
+
+static int mchp_spdifrx_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_spdifrx_subcode_ch_get(struct mchp_spdifrx_dev *dev,
+ int channel,
+ struct snd_ctl_elem_value *uvalue)
+{
+ struct mchp_spdifrx_mixer_control *ctrl = &dev->control;
+ struct mchp_spdifrx_user_data *user_data = &ctrl->user_data[channel];
+ int ret = 0;
+
+ mutex_lock(&dev->mlock);
+
+ /*
+ * We may reach this point with both clocks enabled but the receiver
+ * still disabled. To void waiting for completion to just timeout we
+ * check here the dev->trigger_enabled flag.
+ *
+ * To retrieve data:
+ * - if the receiver is enabled we need to wait for blockend IRQ to read
+ * data to and update it for us in software caches
+ * - otherwise reading the SPDIFRX_CHUD() registers is enough.
+ */
+
+ if (dev->trigger_enabled) {
+ reinit_completion(&user_data->done);
+ regmap_write(dev->regmap, SPDIFRX_IER, SPDIFRX_IR_BLOCKEND);
+ ret = wait_for_completion_interruptible_timeout(&user_data->done,
+ msecs_to_jiffies(100));
+ /* Valid stream might not be present. */
+ if (ret <= 0) {
+ dev_dbg(dev->dev, "user data for channel %d timeout\n",
+ channel);
+ regmap_write(dev->regmap, SPDIFRX_IDR, SPDIFRX_IR_BLOCKEND);
+ ret = ret ? : -ETIMEDOUT;
+ goto unlock;
+ } else {
+ ret = 0;
+ }
+ } else {
+ /* Update software cache with last available data. */
+ mchp_spdifrx_channel_user_data_read(dev, channel);
+ }
+
+ memcpy(uvalue->value.iec958.subcode, user_data->data,
+ sizeof(user_data->data));
+
+unlock:
+ mutex_unlock(&dev->mlock);
+ return ret;
+}
+
+static int mchp_spdifrx_subcode_ch1_get(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *uvalue)
+{
+ struct snd_soc_dai *dai = snd_kcontrol_chip(kcontrol);
+ struct mchp_spdifrx_dev *dev = snd_soc_dai_get_drvdata(dai);
+
+ return mchp_spdifrx_subcode_ch_get(dev, 0, uvalue);
+}
+
+static int mchp_spdifrx_subcode_ch2_get(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *uvalue)
+{
+ struct snd_soc_dai *dai = snd_kcontrol_chip(kcontrol);
+ struct mchp_spdifrx_dev *dev = snd_soc_dai_get_drvdata(dai);
+
+ return mchp_spdifrx_subcode_ch_get(dev, 1, uvalue);
+}
+
+static int mchp_spdifrx_boolean_info(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_info *uinfo)
+{
+ uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
+ uinfo->count = 1;
+ uinfo->value.integer.min = 0;
+ uinfo->value.integer.max = 1;
+
+ return 0;
+}
+
+static int mchp_spdifrx_ulock_get(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *uvalue)
+{
+ struct snd_soc_dai *dai = snd_kcontrol_chip(kcontrol);
+ struct mchp_spdifrx_dev *dev = snd_soc_dai_get_drvdata(dai);
+ struct mchp_spdifrx_mixer_control *ctrl = &dev->control;
+ u32 val;
+ bool ulock_old = ctrl->ulock;
+
+ mutex_lock(&dev->mlock);
+
+ /*
+ * The RSR.ULOCK has wrong value if both pclk and gclk are enabled
+ * and the receiver is disabled. Thus we take into account the
+ * dev->trigger_enabled here to return a real status.
+ */
+ if (dev->trigger_enabled) {
+ regmap_read(dev->regmap, SPDIFRX_RSR, &val);
+ ctrl->ulock = !(val & SPDIFRX_RSR_ULOCK);
+ } else {
+ ctrl->ulock = 0;
+ }
+
+ uvalue->value.integer.value[0] = ctrl->ulock;
+
+ mutex_unlock(&dev->mlock);
+
+ return ulock_old != ctrl->ulock;
+}
+
+static int mchp_spdifrx_badf_get(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *uvalue)
+{
+ struct snd_soc_dai *dai = snd_kcontrol_chip(kcontrol);
+ struct mchp_spdifrx_dev *dev = snd_soc_dai_get_drvdata(dai);
+ struct mchp_spdifrx_mixer_control *ctrl = &dev->control;
+ u32 val;
+ bool badf_old = ctrl->badf;
+
+ mutex_lock(&dev->mlock);
+
+ /*
+ * The RSR.ULOCK has wrong value if both pclk and gclk are enabled
+ * and the receiver is disabled. Thus we take into account the
+ * dev->trigger_enabled here to return a real status.
+ */
+ if (dev->trigger_enabled) {
+ regmap_read(dev->regmap, SPDIFRX_RSR, &val);
+ ctrl->badf = !!(val & SPDIFRX_RSR_BADF);
+ } else {
+ ctrl->badf = 0;
+ }
+
+ mutex_unlock(&dev->mlock);
+
+ uvalue->value.integer.value[0] = ctrl->badf;
+
+ return badf_old != ctrl->badf;
+}
+
+static int mchp_spdifrx_signal_get(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *uvalue)
+{
+ struct snd_soc_dai *dai = snd_kcontrol_chip(kcontrol);
+ struct mchp_spdifrx_dev *dev = snd_soc_dai_get_drvdata(dai);
+ struct mchp_spdifrx_mixer_control *ctrl = &dev->control;
+ u32 val = ~0U, loops = 10;
+ int ret;
+ bool signal_old = ctrl->signal;
+
+ mutex_lock(&dev->mlock);
+
+ /*
+ * To get the signal we need to have receiver enabled. This
+ * could be enabled also from trigger() function thus we need to
+ * take care of not disabling the receiver when it runs.
+ */
+ if (!dev->trigger_enabled) {
+ ret = clk_prepare_enable(dev->gclk);
+ if (ret)
+ goto unlock;
+
+ regmap_update_bits(dev->regmap, SPDIFRX_MR, SPDIFRX_MR_RXEN_MASK,
+ SPDIFRX_MR_RXEN_ENABLE);
+
+ /* Wait for RSR.ULOCK bit. */
+ while (--loops) {
+ regmap_read(dev->regmap, SPDIFRX_RSR, &val);
+ if (!(val & SPDIFRX_RSR_ULOCK))
+ break;
+ usleep_range(100, 150);
+ }
+
+ regmap_update_bits(dev->regmap, SPDIFRX_MR, SPDIFRX_MR_RXEN_MASK,
+ SPDIFRX_MR_RXEN_DISABLE);
+
+ clk_disable_unprepare(dev->gclk);
+ } else {
+ regmap_read(dev->regmap, SPDIFRX_RSR, &val);
+ }
+
+unlock:
+ mutex_unlock(&dev->mlock);
+
+ if (!(val & SPDIFRX_RSR_ULOCK))
+ ctrl->signal = !(val & SPDIFRX_RSR_NOSIGNAL);
+ else
+ ctrl->signal = 0;
+ uvalue->value.integer.value[0] = ctrl->signal;
+
+ return signal_old != ctrl->signal;
+}
+
+static int mchp_spdifrx_rate_info(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_info *uinfo)
+{
+ uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
+ uinfo->count = 1;
+ uinfo->value.integer.min = 0;
+ uinfo->value.integer.max = 192000;
+
+ return 0;
+}
+
+static int mchp_spdifrx_rate_get(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol)
+{
+ struct snd_soc_dai *dai = snd_kcontrol_chip(kcontrol);
+ struct mchp_spdifrx_dev *dev = snd_soc_dai_get_drvdata(dai);
+ u32 val;
+ int rate;
+
+ mutex_lock(&dev->mlock);
+
+ /*
+ * The RSR.ULOCK has wrong value if both pclk and gclk are enabled
+ * and the receiver is disabled. Thus we take into account the
+ * dev->trigger_enabled here to return a real status.
+ */
+ if (dev->trigger_enabled) {
+ regmap_read(dev->regmap, SPDIFRX_RSR, &val);
+ /* If the receiver is not locked, ISF data is invalid. */
+ if (val & SPDIFRX_RSR_ULOCK || !(val & SPDIFRX_RSR_IFS_MASK)) {
+ ucontrol->value.integer.value[0] = 0;
+ goto unlock;
+ }
+ } else {
+ /* Reveicer is not locked, IFS data is invalid. */
+ ucontrol->value.integer.value[0] = 0;
+ goto unlock;
+ }
+
+ rate = clk_get_rate(dev->gclk);
+
+ ucontrol->value.integer.value[0] = rate / (32 * SPDIFRX_RSR_IFS(val));
+
+unlock:
+ mutex_unlock(&dev->mlock);
+ return 0;
+}
+
+static struct snd_kcontrol_new mchp_spdifrx_ctrls[] = {
+ /* Channel status controller */
+ {
+ .iface = SNDRV_CTL_ELEM_IFACE_PCM,
+ .name = SNDRV_CTL_NAME_IEC958("", CAPTURE, DEFAULT)
+ " Channel 1",
+ .access = SNDRV_CTL_ELEM_ACCESS_READ |
+ SNDRV_CTL_ELEM_ACCESS_VOLATILE,
+ .info = mchp_spdifrx_info,
+ .get = mchp_spdifrx_cs1_get,
+ },
+ {
+ .iface = SNDRV_CTL_ELEM_IFACE_PCM,
+ .name = SNDRV_CTL_NAME_IEC958("", CAPTURE, DEFAULT)
+ " Channel 2",
+ .access = SNDRV_CTL_ELEM_ACCESS_READ |
+ SNDRV_CTL_ELEM_ACCESS_VOLATILE,
+ .info = mchp_spdifrx_info,
+ .get = mchp_spdifrx_cs2_get,
+ },
+ {
+ .iface = SNDRV_CTL_ELEM_IFACE_PCM,
+ .name = SNDRV_CTL_NAME_IEC958("", CAPTURE, MASK),
+ .access = SNDRV_CTL_ELEM_ACCESS_READ,
+ .info = mchp_spdifrx_info,
+ .get = mchp_spdifrx_cs_mask,
+ },
+ /* User bits controller */
+ {
+ .iface = SNDRV_CTL_ELEM_IFACE_PCM,
+ .name = "IEC958 Subcode Capture Default Channel 1",
+ .access = SNDRV_CTL_ELEM_ACCESS_READ |
+ SNDRV_CTL_ELEM_ACCESS_VOLATILE,
+ .info = mchp_spdifrx_info,
+ .get = mchp_spdifrx_subcode_ch1_get,
+ },
+ {
+ .iface = SNDRV_CTL_ELEM_IFACE_PCM,
+ .name = "IEC958 Subcode Capture Default Channel 2",
+ .access = SNDRV_CTL_ELEM_ACCESS_READ |
+ SNDRV_CTL_ELEM_ACCESS_VOLATILE,
+ .info = mchp_spdifrx_info,
+ .get = mchp_spdifrx_subcode_ch2_get,
+ },
+ /* Lock status */
+ {
+ .iface = SNDRV_CTL_ELEM_IFACE_PCM,
+ .name = SNDRV_CTL_NAME_IEC958("", CAPTURE, NONE) "Unlocked",
+ .access = SNDRV_CTL_ELEM_ACCESS_READ |
+ SNDRV_CTL_ELEM_ACCESS_VOLATILE,
+ .info = mchp_spdifrx_boolean_info,
+ .get = mchp_spdifrx_ulock_get,
+ },
+ /* Bad format */
+ {
+ .iface = SNDRV_CTL_ELEM_IFACE_PCM,
+ .name = SNDRV_CTL_NAME_IEC958("", CAPTURE, NONE)"Bad Format",
+ .access = SNDRV_CTL_ELEM_ACCESS_READ |
+ SNDRV_CTL_ELEM_ACCESS_VOLATILE,
+ .info = mchp_spdifrx_boolean_info,
+ .get = mchp_spdifrx_badf_get,
+ },
+ /* Signal */
+ {
+ .iface = SNDRV_CTL_ELEM_IFACE_PCM,
+ .name = SNDRV_CTL_NAME_IEC958("", CAPTURE, NONE) "Signal",
+ .access = SNDRV_CTL_ELEM_ACCESS_READ |
+ SNDRV_CTL_ELEM_ACCESS_VOLATILE,
+ .info = mchp_spdifrx_boolean_info,
+ .get = mchp_spdifrx_signal_get,
+ },
+ /* Sampling rate */
+ {
+ .iface = SNDRV_CTL_ELEM_IFACE_PCM,
+ .name = SNDRV_CTL_NAME_IEC958("", CAPTURE, NONE) "Rate",
+ .access = SNDRV_CTL_ELEM_ACCESS_READ |
+ SNDRV_CTL_ELEM_ACCESS_VOLATILE,
+ .info = mchp_spdifrx_rate_info,
+ .get = mchp_spdifrx_rate_get,
+ },
+};
+
+static int mchp_spdifrx_dai_probe(struct snd_soc_dai *dai)
+{
+ struct mchp_spdifrx_dev *dev = snd_soc_dai_get_drvdata(dai);
+ struct mchp_spdifrx_mixer_control *ctrl = &dev->control;
+ int ch;
+ int err;
+
+ err = clk_prepare_enable(dev->pclk);
+ if (err) {
+ dev_err(dev->dev,
+ "failed to enable the peripheral clock: %d\n", err);
+ return err;
+ }
+
+ snd_soc_dai_init_dma_data(dai, NULL, &dev->capture);
+
+ /* Software reset the IP */
+ regmap_write(dev->regmap, SPDIFRX_CR, SPDIFRX_CR_SWRST);
+
+ /* Default configuration */
+ regmap_write(dev->regmap, SPDIFRX_MR,
+ SPDIFRX_MR_VBMODE_DISCARD_IF_VB1 |
+ SPDIFRX_MR_SBMODE_DISCARD |
+ SPDIFRX_MR_AUTORST_NOACTION |
+ SPDIFRX_MR_PACK_DISABLED);
+
+ for (ch = 0; ch < SPDIFRX_CHANNELS; ch++) {
+ init_completion(&ctrl->ch_stat[ch].done);
+ init_completion(&ctrl->user_data[ch].done);
+ }
+
+ /* Add controls */
+ snd_soc_add_dai_controls(dai, mchp_spdifrx_ctrls,
+ ARRAY_SIZE(mchp_spdifrx_ctrls));
+
+ return 0;
+}
+
+static int mchp_spdifrx_dai_remove(struct snd_soc_dai *dai)
+{
+ struct mchp_spdifrx_dev *dev = snd_soc_dai_get_drvdata(dai);
+
+ /* Disable interrupts */
+ regmap_write(dev->regmap, SPDIFRX_IDR, GENMASK(14, 0));
+
+ clk_disable_unprepare(dev->pclk);
+
+ return 0;
+}
+
+static struct snd_soc_dai_driver mchp_spdifrx_dai = {
+ .name = "mchp-spdifrx",
+ .probe = mchp_spdifrx_dai_probe,
+ .remove = mchp_spdifrx_dai_remove,
+ .capture = {
+ .stream_name = "S/PDIF Capture",
+ .channels_min = SPDIFRX_CHANNELS,
+ .channels_max = SPDIFRX_CHANNELS,
+ .rates = MCHP_SPDIF_RATES,
+ .formats = MCHP_SPDIF_FORMATS,
+ },
+ .ops = &mchp_spdifrx_dai_ops,
+};
+
+static const struct snd_soc_component_driver mchp_spdifrx_component = {
+ .name = "mchp-spdifrx",
+ .legacy_dai_naming = 1,
+};
+
+static const struct of_device_id mchp_spdifrx_dt_ids[] = {
+ {
+ .compatible = "microchip,sama7g5-spdifrx",
+ },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, mchp_spdifrx_dt_ids);
+
+static int mchp_spdifrx_probe(struct platform_device *pdev)
+{
+ struct mchp_spdifrx_dev *dev;
+ struct resource *mem;
+ struct regmap *regmap;
+ void __iomem *base;
+ int irq;
+ int err;
+ u32 vers;
+
+ /* Get memory for driver data. */
+ dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
+ if (!dev)
+ return -ENOMEM;
+
+ /* 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_spdifrx_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_spdif_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 generated 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 generated clock: %d\n", err);
+ return err;
+ }
+
+ /*
+ * Signal control need a valid rate on gclk. hw_params() configures
+ * it propertly but requesting signal before any hw_params() has been
+ * called lead to invalid value returned for signal. Thus, configure
+ * gclk at a valid rate, here, in initialization, to simplify the
+ * control path.
+ */
+ clk_set_min_rate(dev->gclk, 48000 * SPDIFRX_GCLK_RATIO_MIN + 1);
+
+ mutex_init(&dev->mlock);
+
+ dev->dev = &pdev->dev;
+ dev->regmap = regmap;
+ platform_set_drvdata(pdev, dev);
+
+ dev->capture.addr = (dma_addr_t)mem->start + SPDIFRX_RHR;
+ dev->capture.maxburst = 1;
+
+ err = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
+ if (err) {
+ dev_err(&pdev->dev, "failed to register PCM: %d\n", err);
+ return err;
+ }
+
+ err = devm_snd_soc_register_component(&pdev->dev,
+ &mchp_spdifrx_component,
+ &mchp_spdifrx_dai, 1);
+ if (err) {
+ dev_err(&pdev->dev, "fail to register dai\n");
+ return err;
+ }
+
+ regmap_read(regmap, SPDIFRX_VERSION, &vers);
+ dev_info(&pdev->dev, "hw version: %#lx\n", vers & SPDIFRX_VERSION_MASK);
+
+ return 0;
+}
+
+static struct platform_driver mchp_spdifrx_driver = {
+ .probe = mchp_spdifrx_probe,
+ .driver = {
+ .name = "mchp_spdifrx",
+ .of_match_table = of_match_ptr(mchp_spdifrx_dt_ids),
+ },
+};
+
+module_platform_driver(mchp_spdifrx_driver);
+
+MODULE_AUTHOR("Codrin Ciubotariu <codrin.ciubotariu@microchip.com>");
+MODULE_DESCRIPTION("Microchip S/PDIF RX Controller Driver");
+MODULE_LICENSE("GPL v2");
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-30 21:34:58 +0000