1 files changed, 526 insertions, 0 deletions

diff --git a/sound/soc/omap/omap-mcpdm.c b/sound/soc/omap/omap-mcpdm.c
new file mode 100644
index 000000000..b837265ac
--- /dev/null
+++ b/sound/soc/omap/omap-mcpdm.c
@@ -0,0 +1,526 @@
+/*
+ * omap-mcpdm.c  --  OMAP ALSA SoC DAI driver using McPDM port
+ *
+ * Copyright (C) 2009 - 2011 Texas Instruments
+ *
+ * Author: Misael Lopez Cruz <misael.lopez@ti.com>
+ * Contact: Jorge Eduardo Candelaria <x0107209@ti.com>
+ *          Margarita Olaya <magi.olaya@ti.com>
+ *          Peter Ujfalusi <peter.ujfalusi@ti.com>
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/slab.h>
+#include <linux/pm_runtime.h>
+#include <linux/of_device.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/dmaengine_pcm.h>
+#include <sound/omap-pcm.h>
+
+#include "omap-mcpdm.h"
+
+struct mcpdm_link_config {
+	u32 link_mask; /* channel mask for the direction */
+	u32 threshold; /* FIFO threshold */
+};
+
+struct omap_mcpdm {
+	struct device *dev;
+	unsigned long phys_base;
+	void __iomem *io_base;
+	int irq;
+
+	struct mutex mutex;
+
+	/* Playback/Capture configuration */
+	struct mcpdm_link_config config[2];
+
+	/* McPDM dn offsets for rx1, and 2 channels */
+	u32 dn_rx_offset;
+
+	/* McPDM needs to be restarted due to runtime reconfiguration */
+	bool restart;
+
+	struct snd_dmaengine_dai_dma_data dma_data[2];
+};
+
+/*
+ * Stream DMA parameters
+ */
+
+static inline void omap_mcpdm_write(struct omap_mcpdm *mcpdm, u16 reg, u32 val)
+{
+	writel_relaxed(val, mcpdm->io_base + reg);
+}
+
+static inline int omap_mcpdm_read(struct omap_mcpdm *mcpdm, u16 reg)
+{
+	return readl_relaxed(mcpdm->io_base + reg);
+}
+
+#ifdef DEBUG
+static void omap_mcpdm_reg_dump(struct omap_mcpdm *mcpdm)
+{
+	dev_dbg(mcpdm->dev, "***********************\n");
+	dev_dbg(mcpdm->dev, "IRQSTATUS_RAW:  0x%04x\n",
+			omap_mcpdm_read(mcpdm, MCPDM_REG_IRQSTATUS_RAW));
+	dev_dbg(mcpdm->dev, "IRQSTATUS:  0x%04x\n",
+			omap_mcpdm_read(mcpdm, MCPDM_REG_IRQSTATUS));
+	dev_dbg(mcpdm->dev, "IRQENABLE_SET:  0x%04x\n",
+			omap_mcpdm_read(mcpdm, MCPDM_REG_IRQENABLE_SET));
+	dev_dbg(mcpdm->dev, "IRQENABLE_CLR:  0x%04x\n",
+			omap_mcpdm_read(mcpdm, MCPDM_REG_IRQENABLE_CLR));
+	dev_dbg(mcpdm->dev, "IRQWAKE_EN: 0x%04x\n",
+			omap_mcpdm_read(mcpdm, MCPDM_REG_IRQWAKE_EN));
+	dev_dbg(mcpdm->dev, "DMAENABLE_SET: 0x%04x\n",
+			omap_mcpdm_read(mcpdm, MCPDM_REG_DMAENABLE_SET));
+	dev_dbg(mcpdm->dev, "DMAENABLE_CLR:  0x%04x\n",
+			omap_mcpdm_read(mcpdm, MCPDM_REG_DMAENABLE_CLR));
+	dev_dbg(mcpdm->dev, "DMAWAKEEN:  0x%04x\n",
+			omap_mcpdm_read(mcpdm, MCPDM_REG_DMAWAKEEN));
+	dev_dbg(mcpdm->dev, "CTRL:  0x%04x\n",
+			omap_mcpdm_read(mcpdm, MCPDM_REG_CTRL));
+	dev_dbg(mcpdm->dev, "DN_DATA:  0x%04x\n",
+			omap_mcpdm_read(mcpdm, MCPDM_REG_DN_DATA));
+	dev_dbg(mcpdm->dev, "UP_DATA: 0x%04x\n",
+			omap_mcpdm_read(mcpdm, MCPDM_REG_UP_DATA));
+	dev_dbg(mcpdm->dev, "FIFO_CTRL_DN: 0x%04x\n",
+			omap_mcpdm_read(mcpdm, MCPDM_REG_FIFO_CTRL_DN));
+	dev_dbg(mcpdm->dev, "FIFO_CTRL_UP:  0x%04x\n",
+			omap_mcpdm_read(mcpdm, MCPDM_REG_FIFO_CTRL_UP));
+	dev_dbg(mcpdm->dev, "***********************\n");
+}
+#else
+static void omap_mcpdm_reg_dump(struct omap_mcpdm *mcpdm) {}
+#endif
+
+/*
+ * Enables the transfer through the PDM interface to/from the Phoenix
+ * codec by enabling the corresponding UP or DN channels.
+ */
+static void omap_mcpdm_start(struct omap_mcpdm *mcpdm)
+{
+	u32 ctrl = omap_mcpdm_read(mcpdm, MCPDM_REG_CTRL);
+	u32 link_mask = mcpdm->config[0].link_mask | mcpdm->config[1].link_mask;
+
+	ctrl |= (MCPDM_SW_DN_RST | MCPDM_SW_UP_RST);
+	omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl);
+
+	ctrl |= link_mask;
+	omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl);
+
+	ctrl &= ~(MCPDM_SW_DN_RST | MCPDM_SW_UP_RST);
+	omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl);
+}
+
+/*
+ * Disables the transfer through the PDM interface to/from the Phoenix
+ * codec by disabling the corresponding UP or DN channels.
+ */
+static void omap_mcpdm_stop(struct omap_mcpdm *mcpdm)
+{
+	u32 ctrl = omap_mcpdm_read(mcpdm, MCPDM_REG_CTRL);
+	u32 link_mask = MCPDM_PDM_DN_MASK | MCPDM_PDM_UP_MASK;
+
+	ctrl |= (MCPDM_SW_DN_RST | MCPDM_SW_UP_RST);
+	omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl);
+
+	ctrl &= ~(link_mask);
+	omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl);
+
+	ctrl &= ~(MCPDM_SW_DN_RST | MCPDM_SW_UP_RST);
+	omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl);
+
+}
+
+/*
+ * Is the physical McPDM interface active.
+ */
+static inline int omap_mcpdm_active(struct omap_mcpdm *mcpdm)
+{
+	return omap_mcpdm_read(mcpdm, MCPDM_REG_CTRL) &
+					(MCPDM_PDM_DN_MASK | MCPDM_PDM_UP_MASK);
+}
+
+/*
+ * Configures McPDM uplink, and downlink for audio.
+ * This function should be called before omap_mcpdm_start.
+ */
+static void omap_mcpdm_open_streams(struct omap_mcpdm *mcpdm)
+{
+	omap_mcpdm_write(mcpdm, MCPDM_REG_IRQENABLE_SET,
+			MCPDM_DN_IRQ_EMPTY | MCPDM_DN_IRQ_FULL |
+			MCPDM_UP_IRQ_EMPTY | MCPDM_UP_IRQ_FULL);
+
+	/* Enable DN RX1/2 offset cancellation feature, if configured */
+	if (mcpdm->dn_rx_offset) {
+		u32 dn_offset = mcpdm->dn_rx_offset;
+
+		omap_mcpdm_write(mcpdm, MCPDM_REG_DN_OFFSET, dn_offset);
+		dn_offset |= (MCPDM_DN_OFST_RX1_EN | MCPDM_DN_OFST_RX2_EN);
+		omap_mcpdm_write(mcpdm, MCPDM_REG_DN_OFFSET, dn_offset);
+	}
+
+	omap_mcpdm_write(mcpdm, MCPDM_REG_FIFO_CTRL_DN,
+			 mcpdm->config[SNDRV_PCM_STREAM_PLAYBACK].threshold);
+	omap_mcpdm_write(mcpdm, MCPDM_REG_FIFO_CTRL_UP,
+			 mcpdm->config[SNDRV_PCM_STREAM_CAPTURE].threshold);
+
+	omap_mcpdm_write(mcpdm, MCPDM_REG_DMAENABLE_SET,
+			MCPDM_DMA_DN_ENABLE | MCPDM_DMA_UP_ENABLE);
+}
+
+/*
+ * Cleans McPDM uplink, and downlink configuration.
+ * This function should be called when the stream is closed.
+ */
+static void omap_mcpdm_close_streams(struct omap_mcpdm *mcpdm)
+{
+	/* Disable irq request generation for downlink */
+	omap_mcpdm_write(mcpdm, MCPDM_REG_IRQENABLE_CLR,
+			MCPDM_DN_IRQ_EMPTY | MCPDM_DN_IRQ_FULL);
+
+	/* Disable DMA request generation for downlink */
+	omap_mcpdm_write(mcpdm, MCPDM_REG_DMAENABLE_CLR, MCPDM_DMA_DN_ENABLE);
+
+	/* Disable irq request generation for uplink */
+	omap_mcpdm_write(mcpdm, MCPDM_REG_IRQENABLE_CLR,
+			MCPDM_UP_IRQ_EMPTY | MCPDM_UP_IRQ_FULL);
+
+	/* Disable DMA request generation for uplink */
+	omap_mcpdm_write(mcpdm, MCPDM_REG_DMAENABLE_CLR, MCPDM_DMA_UP_ENABLE);
+
+	/* Disable RX1/2 offset cancellation */
+	if (mcpdm->dn_rx_offset)
+		omap_mcpdm_write(mcpdm, MCPDM_REG_DN_OFFSET, 0);
+}
+
+static irqreturn_t omap_mcpdm_irq_handler(int irq, void *dev_id)
+{
+	struct omap_mcpdm *mcpdm = dev_id;
+	int irq_status;
+
+	irq_status = omap_mcpdm_read(mcpdm, MCPDM_REG_IRQSTATUS);
+
+	/* Acknowledge irq event */
+	omap_mcpdm_write(mcpdm, MCPDM_REG_IRQSTATUS, irq_status);
+
+	if (irq_status & MCPDM_DN_IRQ_FULL)
+		dev_dbg(mcpdm->dev, "DN (playback) FIFO Full\n");
+
+	if (irq_status & MCPDM_DN_IRQ_EMPTY)
+		dev_dbg(mcpdm->dev, "DN (playback) FIFO Empty\n");
+
+	if (irq_status & MCPDM_DN_IRQ)
+		dev_dbg(mcpdm->dev, "DN (playback) write request\n");
+
+	if (irq_status & MCPDM_UP_IRQ_FULL)
+		dev_dbg(mcpdm->dev, "UP (capture) FIFO Full\n");
+
+	if (irq_status & MCPDM_UP_IRQ_EMPTY)
+		dev_dbg(mcpdm->dev, "UP (capture) FIFO Empty\n");
+
+	if (irq_status & MCPDM_UP_IRQ)
+		dev_dbg(mcpdm->dev, "UP (capture) write request\n");
+
+	return IRQ_HANDLED;
+}
+
+static int omap_mcpdm_dai_startup(struct snd_pcm_substream *substream,
+				  struct snd_soc_dai *dai)
+{
+	struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(dai);
+
+	mutex_lock(&mcpdm->mutex);
+
+	if (!dai->active) {
+		u32 ctrl = omap_mcpdm_read(mcpdm, MCPDM_REG_CTRL);
+
+		omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl | MCPDM_WD_EN);
+		omap_mcpdm_open_streams(mcpdm);
+	}
+	mutex_unlock(&mcpdm->mutex);
+
+	return 0;
+}
+
+static void omap_mcpdm_dai_shutdown(struct snd_pcm_substream *substream,
+				  struct snd_soc_dai *dai)
+{
+	struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(dai);
+
+	mutex_lock(&mcpdm->mutex);
+
+	if (!dai->active) {
+		if (omap_mcpdm_active(mcpdm)) {
+			omap_mcpdm_stop(mcpdm);
+			omap_mcpdm_close_streams(mcpdm);
+			mcpdm->config[0].link_mask = 0;
+			mcpdm->config[1].link_mask = 0;
+		}
+	}
+
+	mutex_unlock(&mcpdm->mutex);
+}
+
+static int omap_mcpdm_dai_hw_params(struct snd_pcm_substream *substream,
+				    struct snd_pcm_hw_params *params,
+				    struct snd_soc_dai *dai)
+{
+	struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(dai);
+	int stream = substream->stream;
+	struct snd_dmaengine_dai_dma_data *dma_data;
+	u32 threshold;
+	int channels;
+	int link_mask = 0;
+
+	channels = params_channels(params);
+	switch (channels) {
+	case 5:
+		if (stream == SNDRV_PCM_STREAM_CAPTURE)
+			/* up to 3 channels for capture */
+			return -EINVAL;
+		link_mask |= 1 << 4;
+	case 4:
+		if (stream == SNDRV_PCM_STREAM_CAPTURE)
+			/* up to 3 channels for capture */
+			return -EINVAL;
+		link_mask |= 1 << 3;
+	case 3:
+		link_mask |= 1 << 2;
+	case 2:
+		link_mask |= 1 << 1;
+	case 1:
+		link_mask |= 1 << 0;
+		break;
+	default:
+		/* unsupported number of channels */
+		return -EINVAL;
+	}
+
+	dma_data = snd_soc_dai_get_dma_data(dai, substream);
+
+	threshold = mcpdm->config[stream].threshold;
+	/* Configure McPDM channels, and DMA packet size */
+	if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
+		link_mask <<= 3;
+
+		/* If capture is not running assume a stereo stream to come */
+		if (!mcpdm->config[!stream].link_mask)
+			mcpdm->config[!stream].link_mask = 0x3;
+
+		dma_data->maxburst =
+				(MCPDM_DN_THRES_MAX - threshold) * channels;
+	} else {
+		/* If playback is not running assume a stereo stream to come */
+		if (!mcpdm->config[!stream].link_mask)
+			mcpdm->config[!stream].link_mask = (0x3 << 3);
+
+		dma_data->maxburst = threshold * channels;
+	}
+
+	/* Check if we need to restart McPDM with this stream */
+	if (mcpdm->config[stream].link_mask &&
+	    mcpdm->config[stream].link_mask != link_mask)
+		mcpdm->restart = true;
+
+	mcpdm->config[stream].link_mask = link_mask;
+
+	return 0;
+}
+
+static int omap_mcpdm_prepare(struct snd_pcm_substream *substream,
+				  struct snd_soc_dai *dai)
+{
+	struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(dai);
+
+	if (!omap_mcpdm_active(mcpdm)) {
+		omap_mcpdm_start(mcpdm);
+		omap_mcpdm_reg_dump(mcpdm);
+	} else if (mcpdm->restart) {
+		omap_mcpdm_stop(mcpdm);
+		omap_mcpdm_start(mcpdm);
+		mcpdm->restart = false;
+		omap_mcpdm_reg_dump(mcpdm);
+	}
+
+	return 0;
+}
+
+static const struct snd_soc_dai_ops omap_mcpdm_dai_ops = {
+	.startup	= omap_mcpdm_dai_startup,
+	.shutdown	= omap_mcpdm_dai_shutdown,
+	.hw_params	= omap_mcpdm_dai_hw_params,
+	.prepare	= omap_mcpdm_prepare,
+};
+
+static int omap_mcpdm_probe(struct snd_soc_dai *dai)
+{
+	struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(dai);
+	int ret;
+
+	pm_runtime_enable(mcpdm->dev);
+
+	/* Disable lines while request is ongoing */
+	pm_runtime_get_sync(mcpdm->dev);
+	omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, 0x00);
+
+	ret = devm_request_irq(mcpdm->dev, mcpdm->irq, omap_mcpdm_irq_handler,
+				0, "McPDM", (void *)mcpdm);
+
+	pm_runtime_put_sync(mcpdm->dev);
+
+	if (ret) {
+		dev_err(mcpdm->dev, "Request for IRQ failed\n");
+		pm_runtime_disable(mcpdm->dev);
+	}
+
+	/* Configure McPDM threshold values */
+	mcpdm->config[SNDRV_PCM_STREAM_PLAYBACK].threshold = 2;
+	mcpdm->config[SNDRV_PCM_STREAM_CAPTURE].threshold =
+							MCPDM_UP_THRES_MAX - 3;
+
+	snd_soc_dai_init_dma_data(dai,
+				  &mcpdm->dma_data[SNDRV_PCM_STREAM_PLAYBACK],
+				  &mcpdm->dma_data[SNDRV_PCM_STREAM_CAPTURE]);
+
+	return ret;
+}
+
+static int omap_mcpdm_remove(struct snd_soc_dai *dai)
+{
+	struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(dai);
+
+	pm_runtime_disable(mcpdm->dev);
+
+	return 0;
+}
+
+#define OMAP_MCPDM_RATES	(SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
+#define OMAP_MCPDM_FORMATS	SNDRV_PCM_FMTBIT_S32_LE
+
+static struct snd_soc_dai_driver omap_mcpdm_dai = {
+	.probe = omap_mcpdm_probe,
+	.remove = omap_mcpdm_remove,
+	.probe_order = SND_SOC_COMP_ORDER_LATE,
+	.remove_order = SND_SOC_COMP_ORDER_EARLY,
+	.playback = {
+		.channels_min = 1,
+		.channels_max = 5,
+		.rates = OMAP_MCPDM_RATES,
+		.formats = OMAP_MCPDM_FORMATS,
+		.sig_bits = 24,
+	},
+	.capture = {
+		.channels_min = 1,
+		.channels_max = 3,
+		.rates = OMAP_MCPDM_RATES,
+		.formats = OMAP_MCPDM_FORMATS,
+		.sig_bits = 24,
+	},
+	.ops = &omap_mcpdm_dai_ops,
+};
+
+static const struct snd_soc_component_driver omap_mcpdm_component = {
+	.name		= "omap-mcpdm",
+};
+
+void omap_mcpdm_configure_dn_offsets(struct snd_soc_pcm_runtime *rtd,
+				    u8 rx1, u8 rx2)
+{
+	struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(rtd->cpu_dai);
+
+	mcpdm->dn_rx_offset = MCPDM_DNOFST_RX1(rx1) | MCPDM_DNOFST_RX2(rx2);
+}
+EXPORT_SYMBOL_GPL(omap_mcpdm_configure_dn_offsets);
+
+static int asoc_mcpdm_probe(struct platform_device *pdev)
+{
+	struct omap_mcpdm *mcpdm;
+	struct resource *res;
+	int ret;
+
+	mcpdm = devm_kzalloc(&pdev->dev, sizeof(struct omap_mcpdm), GFP_KERNEL);
+	if (!mcpdm)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, mcpdm);
+
+	mutex_init(&mcpdm->mutex);
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dma");
+	if (res == NULL)
+		return -ENOMEM;
+
+	mcpdm->dma_data[0].addr = res->start + MCPDM_REG_DN_DATA;
+	mcpdm->dma_data[1].addr = res->start + MCPDM_REG_UP_DATA;
+
+	mcpdm->dma_data[0].filter_data = "dn_link";
+	mcpdm->dma_data[1].filter_data = "up_link";
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mpu");
+	mcpdm->io_base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(mcpdm->io_base))
+		return PTR_ERR(mcpdm->io_base);
+
+	mcpdm->irq = platform_get_irq(pdev, 0);
+	if (mcpdm->irq < 0)
+		return mcpdm->irq;
+
+	mcpdm->dev = &pdev->dev;
+
+	ret =  devm_snd_soc_register_component(&pdev->dev,
+					       &omap_mcpdm_component,
+					       &omap_mcpdm_dai, 1);
+	if (ret)
+		return ret;
+
+	return omap_pcm_platform_register(&pdev->dev);
+}
+
+static const struct of_device_id omap_mcpdm_of_match[] = {
+	{ .compatible = "ti,omap4-mcpdm", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, omap_mcpdm_of_match);
+
+static struct platform_driver asoc_mcpdm_driver = {
+	.driver = {
+		.name	= "omap-mcpdm",
+		.of_match_table = omap_mcpdm_of_match,
+	},
+
+	.probe	= asoc_mcpdm_probe,
+};
+
+module_platform_driver(asoc_mcpdm_driver);
+
+MODULE_ALIAS("platform:omap-mcpdm");
+MODULE_AUTHOR("Misael Lopez Cruz <misael.lopez@ti.com>");
+MODULE_DESCRIPTION("OMAP PDM SoC Interface");
+MODULE_LICENSE("GPL");