[PATCH v3 7/7] media: platform: rcar_drif: Add DRIF support

[Ramesh Shanmugasundaram <ramesh.shanmugasundaram@bp.renesas.com>]

This patch adds Digital Radio Interface (DRIF) support to R-Car Gen3 SoCs.
The driver exposes each instance of DRIF as a V4L2 SDR device. A DRIF
device represents a channel and each channel can have one or two
sub-channels respectively depending on the target board.

DRIF supports only Rx functionality. It receives samples from a RF
frontend tuner chip it is interfaced with. The combination of DRIF and the
tuner device, which is registered as a sub-device, determines the receive
sample rate and format.

In order to be compliant as a V4L2 SDR device, DRIF needs to bind with
the tuner device, which can be provided by a third party vendor. DRIF acts
as a slave device and the tuner device acts as a master transmitting the
samples. The driver allows asynchronous binding of a tuner device that
is registered as a v4l2 sub-device. The driver can learn about the tuner
it is interfaced with based on port endpoint properties of the device in
device tree. The V4L2 SDR device inherits the controls exposed by the
tuner device.

The device can also be configured to use either one or both of the data
pins at runtime based on the master (tuner) configuration.

Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram@bp.renesas.com>
---
 drivers/media/platform/Kconfig     |   25 +
 drivers/media/platform/Makefile    |    1 +
 drivers/media/platform/rcar_drif.c | 1534 ++++++++++++++++++++++++++++++++++++
 3 files changed, 1560 insertions(+)
 create mode 100644 drivers/media/platform/rcar_drif.c

diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig
index 0245af0..bf40568 100644
--- a/drivers/media/platform/Kconfig
+++ b/drivers/media/platform/Kconfig
@@ -435,3 +435,28 @@ menuconfig DVB_PLATFORM_DRIVERS
 if DVB_PLATFORM_DRIVERS
 source "drivers/media/platform/sti/c8sectpfe/Kconfig"
 endif #DVB_PLATFORM_DRIVERS
+
+menuconfig SDR_PLATFORM_DRIVERS
+	bool "SDR platform devices"
+	depends on MEDIA_SDR_SUPPORT
+	default n
+	---help---
+	  Say Y here to enable support for platform-specific SDR Drivers.
+
+if SDR_PLATFORM_DRIVERS
+
+config VIDEO_RCAR_DRIF
+	tristate "Renesas Digitial Radio Interface (DRIF)"
+	depends on VIDEO_V4L2 && HAS_DMA
+	depends on ARCH_RENESAS
+	select VIDEOBUF2_VMALLOC
+	---help---
+	  Say Y if you want to enable R-Car Gen3 DRIF support. DRIF is Digital
+	  Radio Interface that interfaces with an RF front end chip. It is a
+	  receiver of digital data which uses DMA to transfer received data to
+	  a configured location for an application to use.
+
+	  To compile this driver as a module, choose M here; the module
+	  will be called rcar_drif.
+
+endif # SDR_PLATFORM_DRIVERS
diff --git a/drivers/media/platform/Makefile b/drivers/media/platform/Makefile
index 5b3cb27..1c2daaf 100644
--- a/drivers/media/platform/Makefile
+++ b/drivers/media/platform/Makefile
@@ -47,6 +47,7 @@ obj-$(CONFIG_VIDEO_SH_VOU)		+= sh_vou.o
 
 obj-$(CONFIG_SOC_CAMERA)		+= soc_camera/
 
+obj-$(CONFIG_VIDEO_RCAR_DRIF)		+= rcar_drif.o
 obj-$(CONFIG_VIDEO_RENESAS_FCP) 	+= rcar-fcp.o
 obj-$(CONFIG_VIDEO_RENESAS_FDP1)	+= rcar_fdp1.o
 obj-$(CONFIG_VIDEO_RENESAS_JPU) 	+= rcar_jpu.o
diff --git a/drivers/media/platform/rcar_drif.c b/drivers/media/platform/rcar_drif.c
new file mode 100644
index 0000000..88950e3
--- /dev/null
+++ b/drivers/media/platform/rcar_drif.c
@@ -0,0 +1,1534 @@
+/*
+ * R-Car Gen3 Digital Radio Interface (DRIF) driver
+ *
+ * Copyright (C) 2016 Renesas Electronics Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.
+ */
+
+/*
+ * The R-Car DRIF is a receive only MSIOF like controller with an
+ * external master device driving the SCK. It receives data into a FIFO,
+ * then this driver uses the SYS-DMAC engine to move the data from
+ * the device to memory.
+ *
+ * Each DRIF channel DRIFx (as per datasheet) contains two internal
+ * channels DRIFx0 & DRIFx1 within itself with each having its own resources
+ * like module clk, register set, irq and dma. These internal channels share
+ * common CLK & SYNC from master. The two data pins D0 & D1 shall be
+ * considered to represent the two internal channels. This internal split
+ * is not visible to the master device.
+ *
+ * Depending on the master device, a DRIF channel can use
+ *  (1) both internal channels (D0 & D1) to receive data in parallel (or)
+ *  (2) one internal channel (D0 or D1) to receive data
+ *
+ * The primary design goal of this controller is to act as Digitial Radio
+ * Interface that receives digital samples from a tuner device. Hence the
+ * driver exposes the device as a V4L2 SDR device. In order to qualify as
+ * a V4L2 SDR device, it should possess tuner interface as mandated by the
+ * framework. This driver expects a tuner driver (sub-device) to bind
+ * asynchronously with this device and the combined drivers shall expose
+ * a V4L2 compliant SDR device. The DRIF driver is independent of the
+ * tuner vendor.
+ *
+ * The DRIF h/w can support I2S mode and Frame start synchronization pulse mode.
+ * This driver is tested for I2S mode only because of the availability of
+ * suitable master devices. Hence, not all configurable options of DRIF h/w
+ * like lsb/msb first, syncdl, dtdl etc. are exposed via DT and I2S defaults
+ * are used. These can be exposed later if needed after testing.
+ */
+#include <linux/bitops.h>
+#include <linux/clk.h>
+#include <linux/dma-mapping.h>
+#include <linux/dmaengine.h>
+#include <linux/ioctl.h>
+#include <linux/iopoll.h>
+#include <linux/module.h>
+#include <linux/of_graph.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/sched.h>
+#include <media/v4l2-async.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-event.h>
+#include <media/v4l2-fh.h>
+#include <media/v4l2-ioctl.h>
+#include <media/videobuf2-v4l2.h>
+#include <media/videobuf2-vmalloc.h>
+
+/* DRIF register offsets */
+#define RCAR_DRIF_SITMDR1			0x00
+#define RCAR_DRIF_SITMDR2			0x04
+#define RCAR_DRIF_SITMDR3			0x08
+#define RCAR_DRIF_SIRMDR1			0x10
+#define RCAR_DRIF_SIRMDR2			0x14
+#define RCAR_DRIF_SIRMDR3			0x18
+#define RCAR_DRIF_SICTR				0x28
+#define RCAR_DRIF_SIFCTR			0x30
+#define RCAR_DRIF_SISTR				0x40
+#define RCAR_DRIF_SIIER				0x44
+#define RCAR_DRIF_SIRFDR			0x60
+
+#define RCAR_DRIF_RFOVF			BIT(3)	/* Receive FIFO overflow */
+#define RCAR_DRIF_RFUDF			BIT(4)	/* Receive FIFO underflow */
+#define RCAR_DRIF_RFSERR		BIT(5)	/* Receive frame sync error */
+#define RCAR_DRIF_REOF			BIT(7)	/* Frame reception end */
+#define RCAR_DRIF_RDREQ			BIT(12) /* Receive data xfer req */
+#define RCAR_DRIF_RFFUL			BIT(13)	/* Receive FIFO full */
+
+/* SIRMDR1 */
+#define RCAR_DRIF_SIRMDR1_SYNCMD_FRAME		(0 << 28)
+#define RCAR_DRIF_SIRMDR1_SYNCMD_LR		(3 << 28)
+
+#define RCAR_DRIF_SIRMDR1_SYNCAC_POL_HIGH	(0 << 25)
+#define RCAR_DRIF_SIRMDR1_SYNCAC_POL_LOW	(1 << 25)
+
+#define RCAR_DRIF_SIRMDR1_MSB_FIRST		(0 << 24)
+#define RCAR_DRIF_SIRMDR1_LSB_FIRST		(1 << 24)
+
+#define RCAR_DRIF_SIRMDR1_DTDL_0		(0 << 20)
+#define RCAR_DRIF_SIRMDR1_DTDL_1		(1 << 20)
+#define RCAR_DRIF_SIRMDR1_DTDL_2		(2 << 20)
+#define RCAR_DRIF_SIRMDR1_DTDL_0PT5		(5 << 20)
+#define RCAR_DRIF_SIRMDR1_DTDL_1PT5		(6 << 20)
+
+#define RCAR_DRIF_SIRMDR1_SYNCDL_0		(0 << 20)
+#define RCAR_DRIF_SIRMDR1_SYNCDL_1		(1 << 20)
+#define RCAR_DRIF_SIRMDR1_SYNCDL_2		(2 << 20)
+#define RCAR_DRIF_SIRMDR1_SYNCDL_3		(3 << 20)
+#define RCAR_DRIF_SIRMDR1_SYNCDL_0PT5		(5 << 20)
+#define RCAR_DRIF_SIRMDR1_SYNCDL_1PT5		(6 << 20)
+
+#define RCAR_DRIF_MDR_GRPCNT(n)			(((n) - 1) << 30)
+#define RCAR_DRIF_MDR_BITLEN(n)			(((n) - 1) << 24)
+#define RCAR_DRIF_MDR_WDCNT(n)			(((n) - 1) << 16)
+
+/* Hidden Transmit register that controls CLK & SYNC */
+#define RCAR_DRIF_SITMDR1_PCON			BIT(30)
+
+#define RCAR_DRIF_SICTR_RX_RISING_EDGE		BIT(26)
+#define RCAR_DRIF_SICTR_RX_EN			BIT(8)
+#define RCAR_DRIF_SICTR_RESET			BIT(0)
+
+/* Constants */
+#define RCAR_DRIF_MAX_NUM_HWBUFS		32
+#define RCAR_DRIF_MAX_DEVS			4
+#define RCAR_DRIF_DEFAULT_NUM_HWBUFS		16
+#define RCAR_DRIF_DEFAULT_HWBUF_SIZE		(4 * PAGE_SIZE)
+#define RCAR_DRIF_MAX_CHANNEL			2
+#define RCAR_SDR_BUFFER_SIZE			SZ_64K
+
+/* Internal buffer status flags */
+#define RCAR_DRIF_BUF_DONE			BIT(0)	/* DMA completed */
+#define RCAR_DRIF_BUF_OVERFLOW			BIT(1)	/* Overflow detected */
+
+#define to_rcar_drif_buf_pair(sdr, ch_num, idx)	(sdr->ch[!(ch_num)]->buf[idx])
+
+#define for_each_rcar_drif_channel(ch, ch_mask)			\
+	for_each_set_bit(ch, ch_mask, RCAR_DRIF_MAX_CHANNEL)
+
+static const unsigned int num_hwbufs = 32;
+
+/* Debug */
+static unsigned int debug;
+module_param(debug, uint, 0644);
+MODULE_PARM_DESC(debug, "activate debug info");
+
+#define rdrif_dbg(level, sdr, fmt, arg...)				\
+	v4l2_dbg(level, debug, &sdr->v4l2_dev, fmt, ## arg)
+
+#define rdrif_err(sdr, fmt, arg...)					\
+	dev_err(sdr->v4l2_dev.dev, fmt, ## arg)
+
+/* Stream formats */
+struct rcar_drif_format {
+	u32	pixelformat;
+	u32	buffersize;
+	u32	wdlen;
+	u32	num_ch;
+};
+
+/* Format descriptions for capture */
+static const struct rcar_drif_format formats[] = {
+	{
+		.pixelformat	= V4L2_SDR_FMT_PCU16BE,
+		.buffersize	= RCAR_SDR_BUFFER_SIZE,
+		.wdlen		= 16,
+		.num_ch	= 2,
+	},
+	{
+		.pixelformat	= V4L2_SDR_FMT_PCU18BE,
+		.buffersize	= RCAR_SDR_BUFFER_SIZE,
+		.wdlen		= 18,
+		.num_ch	= 2,
+	},
+	{
+		.pixelformat	= V4L2_SDR_FMT_PCU20BE,
+		.buffersize	= RCAR_SDR_BUFFER_SIZE,
+		.wdlen		= 20,
+		.num_ch	= 2,
+	},
+};
+
+static const unsigned int NUM_FORMATS = ARRAY_SIZE(formats);
+
+/* Buffer for a received frame from one or both internal channels */
+struct rcar_drif_frame_buf {
+	/* Common v4l buffer stuff -- must be first */
+	struct vb2_v4l2_buffer vb;
+	struct list_head list;
+};
+
+struct rcar_drif_async_subdev {
+	struct v4l2_subdev *sd;
+	struct v4l2_async_subdev asd;
+};
+
+/* DMA buffer */
+struct rcar_drif_hwbuf {
+	void *addr;			/* CPU-side address */
+	unsigned int status;		/* Buffer status flags */
+};
+
+/* Internal channel */
+struct rcar_drif {
+	struct rcar_drif_sdr *sdr;	/* Group device */
+	struct platform_device *pdev;	/* Channel's pdev */
+	void __iomem *base;		/* Base register address */
+	resource_size_t start;		/* I/O resource offset */
+	struct dma_chan *dmach;		/* Reserved DMA channel */
+	struct clk *clkp;		/* Module clock */
+	struct rcar_drif_hwbuf *buf[RCAR_DRIF_MAX_NUM_HWBUFS]; /* H/W bufs */
+	dma_addr_t dma_handle;		/* Handle for all bufs */
+	unsigned int num;		/* Channel number */
+	bool acting_sdr;		/* Channel acting as SDR device */
+};
+
+/* DRIF V4L2 SDR */
+struct rcar_drif_sdr {
+	struct device *dev;		/* Platform device */
+	struct video_device *vdev;	/* V4L2 SDR device */
+	struct v4l2_device v4l2_dev;	/* V4L2 device */
+
+	/* Videobuf2 queue and queued buffers list */
+	struct vb2_queue vb_queue;
+	struct list_head queued_bufs;
+	spinlock_t queued_bufs_lock;	/* Protects queued_bufs */
+
+	struct mutex v4l2_mutex;	/* To serialize ioctls */
+	struct mutex vb_queue_mutex;	/* To serialize streaming ioctls */
+	struct v4l2_ctrl_handler ctrl_hdl;	/* SDR control handler */
+	struct v4l2_async_notifier notifier;	/* For subdev (tuner) */
+
+	/* Current V4L2 SDR format array index */
+	unsigned int fmt_idx;
+
+	/* Device tree SYNC properties */
+	u32 mdr1;
+
+	/* Internals */
+	struct rcar_drif *ch[RCAR_DRIF_MAX_CHANNEL]; /* DRIFx0,1 */
+	unsigned long hw_ch_mask;	/* Enabled channels per DT */
+	unsigned long cur_ch_mask;	/* Used channels for an SDR FMT */
+	u32 num_hw_ch;			/* Num of DT enabled channels */
+	u32 num_cur_ch;			/* Num of used channels */
+	u32 hwbuf_size;			/* Each DMA buffer size */
+	u32 produced;			/* Buffers produced by sdr dev */
+};
+
+/* Allocate buffer context */
+static int rcar_drif_alloc_bufctxt(struct rcar_drif_sdr *sdr)
+{
+	struct rcar_drif_hwbuf *bufctx;
+	unsigned int i, idx;
+
+	for_each_rcar_drif_channel(i, &sdr->cur_ch_mask) {
+		bufctx = kcalloc(num_hwbufs, sizeof(*bufctx), GFP_KERNEL);
+		if (!bufctx)
+			return -ENOMEM;
+
+		for (idx = 0; idx < num_hwbufs; idx++)
+			sdr->ch[i]->buf[idx] = bufctx + idx;
+	}
+	return 0;
+}
+
+/* Release buffer context */
+static void rcar_drif_release_bufctxt(struct rcar_drif_sdr *sdr)
+{
+	unsigned int i;
+
+	for_each_rcar_drif_channel(i, &sdr->cur_ch_mask) {
+		kfree(sdr->ch[i]->buf[0]);
+		sdr->ch[i]->buf[0] = NULL;
+	}
+}
+
+/* Release DMA channel */
+static void rcar_drif_release_dmachannel(struct rcar_drif_sdr *sdr)
+{
+	unsigned int i;
+
+	for_each_rcar_drif_channel(i, &sdr->cur_ch_mask)
+		if (sdr->ch[i]->dmach) {
+			dma_release_channel(sdr->ch[i]->dmach);
+			sdr->ch[i]->dmach = NULL;
+		}
+}
+
+/* Allocate DMA channel */
+static int rcar_drif_alloc_dmachannel(struct rcar_drif_sdr *sdr)
+{
+	struct dma_slave_config dma_cfg;
+	unsigned int i;
+	int ret = -ENODEV;
+
+	for_each_rcar_drif_channel(i, &sdr->cur_ch_mask) {
+		struct rcar_drif *ch = sdr->ch[i];
+
+		ch->dmach = dma_request_slave_channel(&ch->pdev->dev, "rx");
+		if (!ch->dmach) {
+			rdrif_err(sdr, "ch%u: dma channel req failed\n", i);
+			goto dmach_error;
+		}
+
+		/* Configure slave */
+		memset(&dma_cfg, 0, sizeof(dma_cfg));
+		dma_cfg.src_addr = (phys_addr_t)(ch->start + RCAR_DRIF_SIRFDR);
+		dma_cfg.dst_addr = 0;
+		dma_cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+		ret = dmaengine_slave_config(ch->dmach, &dma_cfg);
+		if (ret) {
+			rdrif_err(sdr, "ch%u: dma slave config failed\n", i);
+			goto dmach_error;
+		}
+	}
+	return 0;
+
+dmach_error:
+	rcar_drif_release_dmachannel(sdr);
+	return ret;
+}
+
+/* Release queued vb2 buffers */
+static void rcar_drif_release_queued_bufs(struct rcar_drif_sdr *sdr,
+					  enum vb2_buffer_state state)
+{
+	struct rcar_drif_frame_buf *fbuf, *tmp;
+	unsigned long flags;
+
+	spin_lock_irqsave(&sdr->queued_bufs_lock, flags);
+	list_for_each_entry_safe(fbuf, tmp, &sdr->queued_bufs, list) {
+		list_del(&fbuf->list);
+		vb2_buffer_done(&fbuf->vb.vb2_buf, state);
+	}
+	spin_unlock_irqrestore(&sdr->queued_bufs_lock, flags);
+}
+
+/* Set MDR defaults */
+static inline void rcar_drif_set_mdr1(struct rcar_drif_sdr *sdr)
+{
+	unsigned int i;
+
+	/* Set defaults for enabled internal channels */
+	for_each_rcar_drif_channel(i, &sdr->cur_ch_mask) {
+		/* Refer MSIOF section in manual for this register setting */
+		writel(RCAR_DRIF_SITMDR1_PCON,
+		       sdr->ch[i]->base + RCAR_DRIF_SITMDR1);
+
+		/* Setup MDR1 value */
+		writel(sdr->mdr1, sdr->ch[i]->base + RCAR_DRIF_SIRMDR1);
+
+		rdrif_dbg(2, sdr, "ch%u: mdr1 = 0x%08x",
+			  i, readl(sdr->ch[i]->base + RCAR_DRIF_SIRMDR1));
+	}
+}
+
+/* Extract bitlen and wdcnt from given word length */
+static int rcar_drif_convert_wdlen(struct rcar_drif_sdr *sdr,
+				   u32 wdlen, u32 *bitlen, u32 *wdcnt)
+{
+	unsigned int i, nr_wds;
+
+	/* FIFO register size is 32 bits */
+	for (i = 0; i < 32; i++) {
+		nr_wds = wdlen % (32 - i);
+		if (nr_wds == 0) {
+			*bitlen = 32 - i;
+			*wdcnt = wdlen / *bitlen;
+			break;
+		}
+	}
+
+	/* Sanity check range */
+	if (i == 32 || !(*bitlen >= 8 && *bitlen <= 32) ||
+	    !(*wdcnt >= 1 && *wdcnt <= 64)) {
+		rdrif_err(sdr, "invalid wdlen %u configured\n", wdlen);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+/* Set DRIF receive format */
+static int rcar_drif_set_format(struct rcar_drif_sdr *sdr)
+{
+	u32 bitlen, wdcnt, wdlen;
+	unsigned int i;
+	int ret = -EINVAL;
+
+	wdlen = formats[sdr->fmt_idx].wdlen;
+	rdrif_dbg(2, sdr, "setfmt: idx %u, wdlen %u, num_ch %u\n",
+		  sdr->fmt_idx, wdlen, formats[sdr->fmt_idx].num_ch);
+
+	/* Sanity check */
+	if (formats[sdr->fmt_idx].num_ch > sdr->num_cur_ch) {
+		rdrif_err(sdr, "fmt idx %u current ch %u mismatch\n",
+			  sdr->fmt_idx, sdr->num_cur_ch);
+		return ret;
+	}
+
+	/* Get bitlen & wdcnt from wdlen */
+	ret = rcar_drif_convert_wdlen(sdr, wdlen, &bitlen, &wdcnt);
+	if (ret)
+		return ret;
+
+	/* Setup group, bitlen & wdcnt */
+	for_each_rcar_drif_channel(i, &sdr->cur_ch_mask) {
+		u32 mdr;
+
+		/* Two groups */
+		mdr = RCAR_DRIF_MDR_GRPCNT(2) | RCAR_DRIF_MDR_BITLEN(bitlen) |
+		       RCAR_DRIF_MDR_WDCNT(wdcnt);
+		writel(mdr, sdr->ch[i]->base + RCAR_DRIF_SIRMDR2);
+
+		mdr = RCAR_DRIF_MDR_BITLEN(bitlen) | RCAR_DRIF_MDR_WDCNT(wdcnt);
+		writel(mdr, sdr->ch[i]->base + RCAR_DRIF_SIRMDR3);
+
+		rdrif_dbg(2, sdr, "ch%u: new mdr[2,3] = 0x%08x, 0x%08x\n",
+			  i, readl(sdr->ch[i]->base + RCAR_DRIF_SIRMDR2),
+			  readl(sdr->ch[i]->base + RCAR_DRIF_SIRMDR3));
+	}
+	return ret;
+}
+
+/* Release DMA buffers */
+static void rcar_drif_release_buf(struct rcar_drif_sdr *sdr)
+{
+	unsigned int i;
+
+	for_each_rcar_drif_channel(i, &sdr->cur_ch_mask) {
+		struct rcar_drif *ch = sdr->ch[i];
+
+		/* First entry contains the dma buf ptr */
+		if (ch->buf[0] && ch->buf[0]->addr) {
+			dma_free_coherent(&ch->pdev->dev,
+					  sdr->hwbuf_size * num_hwbufs,
+					  ch->buf[0]->addr, ch->dma_handle);
+			ch->buf[0]->addr = NULL;
+		}
+	}
+}
+
+/* Request DMA buffers */
+static int rcar_drif_request_buf(struct rcar_drif_sdr *sdr)
+{
+	int ret = -ENOMEM;
+	unsigned int i, j;
+	void *addr;
+
+	for_each_rcar_drif_channel(i, &sdr->cur_ch_mask) {
+		struct rcar_drif *ch = sdr->ch[i];
+
+		/* Allocate DMA buffers */
+		addr = dma_alloc_coherent(&ch->pdev->dev,
+					  sdr->hwbuf_size * num_hwbufs,
+					  &ch->dma_handle, GFP_KERNEL);
+		if (!addr) {
+			rdrif_err(sdr,
+			"ch%u: dma alloc failed. num_hwbufs %u size %u\n",
+			i, num_hwbufs, sdr->hwbuf_size);
+			goto alloc_error;
+		}
+
+		/* Split the chunk and populate bufctxt */
+		for (j = 0; j < num_hwbufs; j++) {
+			ch->buf[j]->addr = addr + (j * sdr->hwbuf_size);
+			ch->buf[j]->status = 0;
+		}
+	}
+
+	return 0;
+
+alloc_error:
+	return ret;
+}
+
+/* Setup vb_queue minimum buffer requirements */
+static int rcar_drif_queue_setup(struct vb2_queue *vq,
+			unsigned int *num_buffers, unsigned int *num_planes,
+			unsigned int sizes[], struct device *alloc_devs[])
+{
+	struct rcar_drif_sdr *sdr = vb2_get_drv_priv(vq);
+
+	/* Need at least 16 buffers */
+	if (vq->num_buffers + *num_buffers < 16)
+		*num_buffers = 16 - vq->num_buffers;
+
+	*num_planes = 1;
+	sizes[0] = PAGE_ALIGN(formats[sdr->fmt_idx].buffersize);
+
+	rdrif_dbg(2, sdr, "num_bufs %d sizes[0] %d\n", *num_buffers, sizes[0]);
+	return 0;
+}
+
+/* Enqueue buffer */
+static void rcar_drif_buf_queue(struct vb2_buffer *vb)
+{
+	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
+	struct rcar_drif_sdr *sdr = vb2_get_drv_priv(vb->vb2_queue);
+	struct rcar_drif_frame_buf *fbuf =
+			container_of(vbuf, struct rcar_drif_frame_buf, vb);
+	unsigned long flags;
+
+	rdrif_dbg(2, sdr, "buf_queue idx %u\n", vb->index);
+	spin_lock_irqsave(&sdr->queued_bufs_lock, flags);
+	list_add_tail(&fbuf->list, &sdr->queued_bufs);
+	spin_unlock_irqrestore(&sdr->queued_bufs_lock, flags);
+}
+
+/* Get a frame buf from list */
+static struct rcar_drif_frame_buf *
+rcar_drif_get_fbuf(struct rcar_drif_sdr *sdr)
+{
+	struct rcar_drif_frame_buf *fbuf;
+	unsigned long flags;
+
+	spin_lock_irqsave(&sdr->queued_bufs_lock, flags);
+	fbuf = list_first_entry_or_null(&sdr->queued_bufs, struct
+					rcar_drif_frame_buf, list);
+	if (!fbuf) {
+		/*
+		 * App is late in enqueing buffers. Samples lost & there will
+		 * be a gap in sequence number when app recovers
+		 */
+		rdrif_dbg(1, sdr, "\napp late: prod %u\n", sdr->produced);
+		sdr->produced++; /* Increment the produced count anyway */
+		spin_unlock_irqrestore(&sdr->queued_bufs_lock, flags);
+		return NULL;
+	}
+	list_del(&fbuf->list);
+	spin_unlock_irqrestore(&sdr->queued_bufs_lock, flags);
+
+	return fbuf;
+}
+
+static inline bool rcar_drif_buf_pairs_done(struct rcar_drif_hwbuf *buf1,
+					    struct rcar_drif_hwbuf *buf2)
+{
+	return (buf1->status & buf2->status & RCAR_DRIF_BUF_DONE);
+}
+
+/* Channel DMA complete */
+static void rcar_drif_channel_complete(struct rcar_drif *ch, u32 idx)
+{
+	u32 str;
+
+	ch->buf[idx]->status |= RCAR_DRIF_BUF_DONE;
+
+	/* Check for DRIF errors */
+	str = readl(ch->base + RCAR_DRIF_SISTR);
+	if (unlikely(str & RCAR_DRIF_RFOVF)) {
+		/* Writing the same clears it */
+		writel(str, ch->base + RCAR_DRIF_SISTR);
+
+		/* Overflow: some samples are lost */
+		ch->buf[idx]->status |= RCAR_DRIF_BUF_OVERFLOW;
+	}
+}
+
+/* Deliver buffer to user */
+static void rcar_drif_deliver_buf(struct rcar_drif *ch)
+{
+	struct rcar_drif_sdr *sdr = ch->sdr;
+	u32 idx = sdr->produced % num_hwbufs;
+	struct rcar_drif_frame_buf *fbuf;
+	bool overflow = false;
+
+	rcar_drif_channel_complete(ch, idx);
+
+	if (sdr->num_cur_ch == RCAR_DRIF_MAX_CHANNEL) {
+		struct rcar_drif_hwbuf *bufi, *bufq;
+
+		if (ch->num) {
+			bufi = to_rcar_drif_buf_pair(sdr, ch->num, idx);
+			bufq = ch->buf[idx];
+		} else {
+			bufi = ch->buf[idx];
+			bufq = to_rcar_drif_buf_pair(sdr, ch->num, idx);
+		}
+
+		/* Check if both DMA buffers are done */
+		if (!rcar_drif_buf_pairs_done(bufi, bufq))
+			return;
+
+		/* Clear buf done status */
+		bufi->status &= ~RCAR_DRIF_BUF_DONE;
+		bufq->status &= ~RCAR_DRIF_BUF_DONE;
+
+		/* Get fbuf */
+		fbuf = rcar_drif_get_fbuf(sdr);
+		if (!fbuf)
+			return;
+
+		memcpy(vb2_plane_vaddr(&fbuf->vb.vb2_buf, 0),
+		       bufi->addr, sdr->hwbuf_size);
+		memcpy(vb2_plane_vaddr(&fbuf->vb.vb2_buf, 0) + sdr->hwbuf_size,
+		       bufq->addr, sdr->hwbuf_size);
+
+		if ((bufi->status | bufq->status) & RCAR_DRIF_BUF_OVERFLOW) {
+			overflow = true;
+			/* Clear the flag in status */
+			bufi->status &= ~RCAR_DRIF_BUF_OVERFLOW;
+			bufq->status &= ~RCAR_DRIF_BUF_OVERFLOW;
+		}
+	} else {
+		struct rcar_drif_hwbuf *bufiq;
+
+		/* Get fbuf */
+		fbuf = rcar_drif_get_fbuf(sdr);
+		if (!fbuf)
+			return;
+
+		bufiq = ch->buf[idx];
+
+		memcpy(vb2_plane_vaddr(&fbuf->vb.vb2_buf, 0),
+		       bufiq->addr, sdr->hwbuf_size);
+
+		if (bufiq->status & RCAR_DRIF_BUF_OVERFLOW) {
+			overflow = true;
+			/* Clear the flag in status */
+			bufiq->status &= ~RCAR_DRIF_BUF_OVERFLOW;
+		}
+	}
+
+	rdrif_dbg(2, sdr, "ch%u: prod %u\n", ch->num, sdr->produced);
+
+	fbuf->vb.field = V4L2_FIELD_NONE;
+	fbuf->vb.sequence = sdr->produced++;
+	fbuf->vb.vb2_buf.timestamp = ktime_get_ns();
+	vb2_set_plane_payload(&fbuf->vb.vb2_buf, 0,
+			      formats[sdr->fmt_idx].buffersize);
+
+	/* Set error state on overflow */
+	if (overflow)
+		vb2_buffer_done(&fbuf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
+	else
+		vb2_buffer_done(&fbuf->vb.vb2_buf, VB2_BUF_STATE_DONE);
+}
+
+/* DMA callback for each stage */
+static void rcar_drif_dma_complete(void *dma_async_param)
+{
+	struct rcar_drif *ch = dma_async_param;
+	struct rcar_drif_sdr *sdr = ch->sdr;
+
+	mutex_lock(&sdr->vb_queue_mutex);
+
+	/* DMA can be terminated while the callback was waiting on lock */
+	if (!vb2_is_streaming(&sdr->vb_queue))
+		goto stopped;
+
+	rcar_drif_deliver_buf(ch);
+stopped:
+	mutex_unlock(&sdr->vb_queue_mutex);
+}
+
+static int rcar_drif_qbuf(struct rcar_drif *ch)
+{
+	struct rcar_drif_sdr *sdr = ch->sdr;
+	dma_addr_t addr = ch->dma_handle;
+	struct dma_async_tx_descriptor *rxd;
+	dma_cookie_t cookie;
+	int ret = -EIO;
+
+	/* Setup cyclic DMA with given buffers */
+	rxd = dmaengine_prep_dma_cyclic(ch->dmach, addr,
+					sdr->hwbuf_size * num_hwbufs,
+					sdr->hwbuf_size, DMA_DEV_TO_MEM,
+					DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+	if (!rxd) {
+		rdrif_err(sdr, "ch%u: prep dma cyclic failed\n", ch->num);
+		return ret;
+	}
+
+	/* Submit descriptor */
+	rxd->callback = rcar_drif_dma_complete;
+	rxd->callback_param = ch;
+	cookie = dmaengine_submit(rxd);
+	if (dma_submit_error(cookie)) {
+		rdrif_err(sdr, "ch%u: dma submit failed\n", ch->num);
+		return ret;
+	}
+
+	dma_async_issue_pending(ch->dmach);
+	return 0;
+}
+
+/* Enable reception */
+static int rcar_drif_enable_rx(struct rcar_drif_sdr *sdr)
+{
+	unsigned int i;
+	u32 ctr;
+	int ret;
+
+	/*
+	 * When both internal channels are enabled, they can be synchronized
+	 * only by the master
+	 */
+
+	/* Enable receive */
+	for_each_rcar_drif_channel(i, &sdr->cur_ch_mask) {
+		ctr = readl(sdr->ch[i]->base + RCAR_DRIF_SICTR);
+		ctr |= (RCAR_DRIF_SICTR_RX_RISING_EDGE |
+			 RCAR_DRIF_SICTR_RX_EN);
+		writel(ctr, sdr->ch[i]->base + RCAR_DRIF_SICTR);
+	}
+
+	/* Check receive enabled */
+	for_each_rcar_drif_channel(i, &sdr->cur_ch_mask) {
+		ret = readl_poll_timeout(sdr->ch[i]->base + RCAR_DRIF_SICTR,
+					 ctr, ctr & RCAR_DRIF_SICTR_RX_EN,
+					 2, 500000);
+		if (ret) {
+			rdrif_err(sdr, "ch%u: rx en failed. ctr 0x%08x\n",
+				  i, readl(sdr->ch[i]->base + RCAR_DRIF_SICTR));
+			break;
+		}
+	}
+	return ret;
+}
+
+/* Disable reception */
+static void rcar_drif_disable_rx(struct rcar_drif_sdr *sdr)
+{
+	unsigned int i;
+	u32 ctr;
+	int ret;
+
+	/* Disable receive */
+	for_each_rcar_drif_channel(i, &sdr->cur_ch_mask) {
+		ctr = readl(sdr->ch[i]->base + RCAR_DRIF_SICTR);
+		ctr &= ~RCAR_DRIF_SICTR_RX_EN;
+		writel(ctr, sdr->ch[i]->base + RCAR_DRIF_SICTR);
+	}
+
+	/* Check receive disabled */
+	for_each_rcar_drif_channel(i, &sdr->cur_ch_mask) {
+		ret = readl_poll_timeout(sdr->ch[i]->base + RCAR_DRIF_SICTR,
+					 ctr, !(ctr & RCAR_DRIF_SICTR_RX_EN),
+					 2, 500000);
+		if (ret)
+			dev_warn(&sdr->vdev->dev,
+			"ch%u: failed to disable rx. ctr 0x%08x\n",
+			i, readl(sdr->ch[i]->base + RCAR_DRIF_SICTR));
+	}
+}
+
+/* Start channel */
+static int rcar_drif_start_channel(struct rcar_drif *ch)
+{
+	struct rcar_drif_sdr *sdr = ch->sdr;
+	u32 ctr, str;
+	int ret;
+
+	/* Reset receive */
+	writel(RCAR_DRIF_SICTR_RESET, ch->base + RCAR_DRIF_SICTR);
+	ret = readl_poll_timeout(ch->base + RCAR_DRIF_SICTR,
+					 ctr, !(ctr & RCAR_DRIF_SICTR_RESET),
+					 2, 500000);
+	if (ret) {
+		rdrif_err(sdr, "ch%u: failed to reset rx. ctr 0x%08x\n",
+			  ch->num, readl(ch->base + RCAR_DRIF_SICTR));
+		return ret;
+	}
+
+	/* Queue buffers for DMA */
+	ret = rcar_drif_qbuf(ch);
+	if (ret)
+		return ret;
+
+	/* Clear status register flags */
+	str = RCAR_DRIF_RFFUL | RCAR_DRIF_REOF | RCAR_DRIF_RFSERR |
+		RCAR_DRIF_RFUDF | RCAR_DRIF_RFOVF;
+	writel(str, ch->base + RCAR_DRIF_SISTR);
+
+	/* Enable DMA receive interrupt */
+	writel(0x00009000, ch->base + RCAR_DRIF_SIIER);
+
+	return ret;
+}
+
+/* Start receive operation */
+static int rcar_drif_start(struct rcar_drif_sdr *sdr)
+{
+	unsigned int i;
+	int ret;
+
+	for_each_rcar_drif_channel(i, &sdr->cur_ch_mask) {
+		ret = rcar_drif_start_channel(sdr->ch[i]);
+		if (ret)
+			goto start_error;
+	}
+
+	sdr->produced = 0;
+	ret = rcar_drif_enable_rx(sdr);
+start_error:
+	return ret;
+}
+
+/* Stop channel */
+static void rcar_drif_stop_channel(struct rcar_drif *ch)
+{
+	struct rcar_drif_sdr *sdr = ch->sdr;
+	int ret, retries = 3;
+
+	/* Disable DMA receive interrupt */
+	writel(0x00000000, ch->base + RCAR_DRIF_SIIER);
+
+	do {
+		/* Terminate all DMA transfers */
+		ret = dmaengine_terminate_sync(ch->dmach);
+		if (!ret)
+			break;
+		rdrif_dbg(2, sdr, "stop retry\n");
+	} while (--retries);
+
+	WARN_ON(!retries);
+}
+
+/* Stop receive operation */
+static void rcar_drif_stop(struct rcar_drif_sdr *sdr)
+{
+	unsigned int i;
+
+	/* Disable Rx */
+	rcar_drif_disable_rx(sdr);
+
+	for_each_rcar_drif_channel(i, &sdr->cur_ch_mask)
+		rcar_drif_stop_channel(sdr->ch[i]);
+}
+
+/* Start streaming */
+static int rcar_drif_start_streaming(struct vb2_queue *vq, unsigned int count)
+{
+	struct rcar_drif_sdr *sdr = vb2_get_drv_priv(vq);
+	unsigned int i, j;
+	int ret;
+
+	mutex_lock(&sdr->v4l2_mutex);
+
+	for_each_rcar_drif_channel(i, &sdr->cur_ch_mask) {
+		ret = clk_prepare_enable(sdr->ch[i]->clkp);
+		if (ret)
+			goto start_error;
+	}
+
+	/* Set default MDRx settings */
+	rcar_drif_set_mdr1(sdr);
+
+	/* Set new format */
+	ret = rcar_drif_set_format(sdr);
+	if (ret)
+		goto start_error;
+
+	if (sdr->num_cur_ch == RCAR_DRIF_MAX_CHANNEL)
+		sdr->hwbuf_size =
+		formats[sdr->fmt_idx].buffersize / RCAR_DRIF_MAX_CHANNEL;
+	else
+		sdr->hwbuf_size = formats[sdr->fmt_idx].buffersize;
+
+	rdrif_dbg(1, sdr, "num_hwbufs %u, hwbuf_size %u\n",
+		num_hwbufs, sdr->hwbuf_size);
+
+	/* Alloc DMA channel */
+	ret = rcar_drif_alloc_dmachannel(sdr);
+	if (ret)
+		goto start_error;
+
+	/* Alloc buf context */
+	ret = rcar_drif_alloc_bufctxt(sdr);
+	if (ret)
+		goto start_error;
+
+	/* Request buffers */
+	ret = rcar_drif_request_buf(sdr);
+	if (ret)
+		goto start_error;
+
+	/* Start Rx */
+	ret = rcar_drif_start(sdr);
+	if (ret)
+		goto start_error;
+
+	mutex_unlock(&sdr->v4l2_mutex);
+	rdrif_dbg(1, sdr, "started\n");
+	return ret;
+
+start_error:
+	rcar_drif_release_queued_bufs(sdr, VB2_BUF_STATE_QUEUED);
+	rcar_drif_release_buf(sdr);
+	rcar_drif_release_bufctxt(sdr);
+	rcar_drif_release_dmachannel(sdr);
+	for (j = 0; j < i; j++)
+		clk_disable_unprepare(sdr->ch[j]->clkp);
+
+	mutex_unlock(&sdr->v4l2_mutex);
+	return ret;
+}
+
+/* Stop streaming */
+static void rcar_drif_stop_streaming(struct vb2_queue *vq)
+{
+	struct rcar_drif_sdr *sdr = vb2_get_drv_priv(vq);
+	unsigned int i;
+
+	mutex_lock(&sdr->v4l2_mutex);
+
+	/* Stop hardware streaming */
+	rcar_drif_stop(sdr);
+
+	/* Return all queued buffers to vb2 */
+	rcar_drif_release_queued_bufs(sdr, VB2_BUF_STATE_ERROR);
+
+	/* Release buf & buf context */
+	rcar_drif_release_buf(sdr);
+	rcar_drif_release_bufctxt(sdr);
+
+	/* Release DMA channel resources */
+	rcar_drif_release_dmachannel(sdr);
+
+	for_each_rcar_drif_channel(i, &sdr->cur_ch_mask)
+		clk_disable_unprepare(sdr->ch[i]->clkp);
+
+	mutex_unlock(&sdr->v4l2_mutex);
+	rdrif_dbg(1, sdr, "stopped: prod %u\n", sdr->produced);
+}
+
+/* Vb2 ops */
+static struct vb2_ops rcar_drif_vb2_ops = {
+	.queue_setup            = rcar_drif_queue_setup,
+	.buf_queue              = rcar_drif_buf_queue,
+	.start_streaming        = rcar_drif_start_streaming,
+	.stop_streaming         = rcar_drif_stop_streaming,
+	.wait_prepare		= vb2_ops_wait_prepare,
+	.wait_finish		= vb2_ops_wait_finish,
+};
+
+static int rcar_drif_querycap(struct file *file, void *fh,
+			      struct v4l2_capability *cap)
+{
+	struct rcar_drif_sdr *sdr = video_drvdata(file);
+
+	strlcpy(cap->driver, KBUILD_MODNAME, sizeof(cap->driver));
+	strlcpy(cap->card, sdr->vdev->name, sizeof(cap->card));
+	snprintf(cap->bus_info, sizeof(cap->bus_info), "platform:%s",
+		 sdr->vdev->name);
+	return 0;
+}
+
+static int rcar_drif_set_default_format(struct rcar_drif_sdr *sdr)
+{
+	unsigned int i;
+
+	for (i = 0; i < NUM_FORMATS; i++) {
+		/* Matching fmt based on required channels is set as default */
+		if (sdr->num_hw_ch == formats[i].num_ch) {
+			sdr->fmt_idx = i;
+			sdr->cur_ch_mask = sdr->hw_ch_mask;
+			sdr->num_cur_ch = sdr->num_hw_ch;
+			dev_dbg(sdr->dev, "default fmt[%u]: mask %lu num %u\n",
+				i, sdr->cur_ch_mask, sdr->num_cur_ch);
+			return 0;
+		}
+	}
+	return -EINVAL;
+}
+
+static int rcar_drif_enum_fmt_sdr_cap(struct file *file, void *priv,
+				      struct v4l2_fmtdesc *f)
+{
+	if (f->index >= NUM_FORMATS)
+		return -EINVAL;
+
+	f->pixelformat = formats[f->index].pixelformat;
+	return 0;
+}
+
+static int rcar_drif_g_fmt_sdr_cap(struct file *file, void *priv,
+				   struct v4l2_format *f)
+{
+	struct rcar_drif_sdr *sdr = video_drvdata(file);
+
+	f->fmt.sdr.pixelformat = formats[sdr->fmt_idx].pixelformat;
+	f->fmt.sdr.buffersize = formats[sdr->fmt_idx].buffersize;
+	memset(f->fmt.sdr.reserved, 0, sizeof(f->fmt.sdr.reserved));
+	return 0;
+}
+
+static int rcar_drif_s_fmt_sdr_cap(struct file *file, void *priv,
+				   struct v4l2_format *f)
+{
+	struct rcar_drif_sdr *sdr = video_drvdata(file);
+	struct vb2_queue *q = &sdr->vb_queue;
+	unsigned int i;
+
+	if (vb2_is_busy(q))
+		return -EBUSY;
+
+	memset(f->fmt.sdr.reserved, 0, sizeof(f->fmt.sdr.reserved));
+	for (i = 0; i < NUM_FORMATS; i++) {
+		if (formats[i].pixelformat == f->fmt.sdr.pixelformat) {
+			sdr->fmt_idx  = i;
+			f->fmt.sdr.buffersize = formats[i].buffersize;
+
+			/*
+			 * If a format demands one channel only out of two
+			 * enabled channels, pick the 0th channel.
+			 */
+			if (formats[i].num_ch < sdr->num_hw_ch) {
+				sdr->cur_ch_mask = BIT(0);
+				sdr->num_cur_ch = formats[i].num_ch;
+			} else {
+				sdr->cur_ch_mask = sdr->hw_ch_mask;
+				sdr->num_cur_ch = sdr->num_hw_ch;
+			}
+
+			rdrif_dbg(1, sdr, "cur: idx %u mask %lu num %u\n",
+				  i, sdr->cur_ch_mask, sdr->num_cur_ch);
+			return 0;
+		}
+	}
+
+	if (rcar_drif_set_default_format(sdr)) {
+		rdrif_err(sdr, "cannot set default format\n");
+		return -EINVAL;
+	}
+
+	f->fmt.sdr.pixelformat = formats[sdr->fmt_idx].pixelformat;
+	f->fmt.sdr.buffersize = formats[sdr->fmt_idx].buffersize;
+	return 0;
+}
+
+static int rcar_drif_try_fmt_sdr_cap(struct file *file, void *priv,
+				     struct v4l2_format *f)
+{
+	struct rcar_drif_sdr *sdr = video_drvdata(file);
+	unsigned int i;
+
+	memset(f->fmt.sdr.reserved, 0, sizeof(f->fmt.sdr.reserved));
+	for (i = 0; i < NUM_FORMATS; i++) {
+		if (formats[i].pixelformat == f->fmt.sdr.pixelformat) {
+			f->fmt.sdr.buffersize = formats[i].buffersize;
+			return 0;
+		}
+	}
+
+	f->fmt.sdr.pixelformat = formats[sdr->fmt_idx].pixelformat;
+	f->fmt.sdr.buffersize = formats[sdr->fmt_idx].buffersize;
+	return 0;
+}
+
+/* Tuner subdev ioctls */
+static int rcar_drif_enum_freq_bands(struct file *file, void *priv,
+				     struct v4l2_frequency_band *band)
+{
+	struct rcar_drif_sdr *sdr = video_drvdata(file);
+	struct v4l2_subdev *sd;
+	int ret = 0;
+
+	v4l2_device_for_each_subdev(sd, &sdr->v4l2_dev) {
+		ret = v4l2_subdev_call(sd, tuner, enum_freq_bands, band);
+		if (ret)
+			break;
+	}
+	return ret;
+}
+
+static int rcar_drif_g_frequency(struct file *file, void *priv,
+				 struct v4l2_frequency *f)
+{
+	struct rcar_drif_sdr *sdr = video_drvdata(file);
+	struct v4l2_subdev *sd;
+	int ret = 0;
+
+	v4l2_device_for_each_subdev(sd, &sdr->v4l2_dev) {
+		ret = v4l2_subdev_call(sd, tuner, g_frequency, f);
+		if (ret)
+			break;
+	}
+	return ret;
+}
+
+static int rcar_drif_s_frequency(struct file *file, void *priv,
+				 const struct v4l2_frequency *f)
+{
+	struct rcar_drif_sdr *sdr = video_drvdata(file);
+	struct v4l2_subdev *sd;
+	int ret = 0;
+
+	v4l2_device_for_each_subdev(sd, &sdr->v4l2_dev) {
+		ret = v4l2_subdev_call(sd, tuner, s_frequency, f);
+		if (ret)
+			break;
+	}
+	return ret;
+}
+
+static int rcar_drif_g_tuner(struct file *file, void *priv,
+			     struct v4l2_tuner *vt)
+{
+	struct rcar_drif_sdr *sdr = video_drvdata(file);
+	struct v4l2_subdev *sd;
+	int ret = 0;
+
+	v4l2_device_for_each_subdev(sd, &sdr->v4l2_dev) {
+		ret = v4l2_subdev_call(sd, tuner, g_tuner, vt);
+		if (ret)
+			break;
+	}
+	return ret;
+}
+
+static int rcar_drif_s_tuner(struct file *file, void *priv,
+			     const struct v4l2_tuner *vt)
+{
+	struct rcar_drif_sdr *sdr = video_drvdata(file);
+	struct v4l2_subdev *sd;
+	int ret = 0;
+
+	v4l2_device_for_each_subdev(sd, &sdr->v4l2_dev) {
+		ret = v4l2_subdev_call(sd, tuner, s_tuner, vt);
+		if (ret)
+			break;
+	}
+	return ret;
+}
+
+static const struct v4l2_ioctl_ops rcar_drif_ioctl_ops = {
+	.vidioc_querycap          = rcar_drif_querycap,
+
+	.vidioc_enum_fmt_sdr_cap  = rcar_drif_enum_fmt_sdr_cap,
+	.vidioc_g_fmt_sdr_cap     = rcar_drif_g_fmt_sdr_cap,
+	.vidioc_s_fmt_sdr_cap     = rcar_drif_s_fmt_sdr_cap,
+	.vidioc_try_fmt_sdr_cap   = rcar_drif_try_fmt_sdr_cap,
+
+	.vidioc_reqbufs           = vb2_ioctl_reqbufs,
+	.vidioc_create_bufs       = vb2_ioctl_create_bufs,
+	.vidioc_prepare_buf       = vb2_ioctl_prepare_buf,
+	.vidioc_querybuf          = vb2_ioctl_querybuf,
+	.vidioc_qbuf              = vb2_ioctl_qbuf,
+	.vidioc_dqbuf             = vb2_ioctl_dqbuf,
+
+	.vidioc_streamon          = vb2_ioctl_streamon,
+	.vidioc_streamoff         = vb2_ioctl_streamoff,
+
+	.vidioc_s_frequency       = rcar_drif_s_frequency,
+	.vidioc_g_frequency       = rcar_drif_g_frequency,
+	.vidioc_s_tuner		  = rcar_drif_s_tuner,
+	.vidioc_g_tuner		  = rcar_drif_g_tuner,
+	.vidioc_enum_freq_bands   = rcar_drif_enum_freq_bands,
+	.vidioc_subscribe_event   = v4l2_ctrl_subscribe_event,
+	.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
+	.vidioc_log_status        = v4l2_ctrl_log_status,
+};
+
+static const struct v4l2_file_operations rcar_drif_fops = {
+	.owner                    = THIS_MODULE,
+	.open                     = v4l2_fh_open,
+	.release                  = vb2_fop_release,
+	.read                     = vb2_fop_read,
+	.poll                     = vb2_fop_poll,
+	.mmap                     = vb2_fop_mmap,
+	.unlocked_ioctl           = video_ioctl2,
+};
+
+static int rcar_drif_notify_bound(struct v4l2_async_notifier *notifier,
+				   struct v4l2_subdev *subdev,
+				   struct v4l2_async_subdev *asd)
+{
+	struct rcar_drif_sdr *sdr =
+		container_of(notifier, struct rcar_drif_sdr, notifier);
+
+	/* Nothing to do at this point */
+	rdrif_dbg(2, sdr, "bound asd: %s\n", asd->match.of.node->name);
+	return 0;
+}
+
+/* Sub-device registered notification callback */
+static int rcar_drif_notify_complete(struct v4l2_async_notifier *notifier)
+{
+	struct rcar_drif_sdr *sdr =
+		container_of(notifier, struct rcar_drif_sdr, notifier);
+	struct v4l2_subdev *sd;
+	int ret;
+
+	sdr->v4l2_dev.ctrl_handler = &sdr->ctrl_hdl;
+
+	ret = v4l2_device_register_subdev_nodes(&sdr->v4l2_dev);
+	if (ret) {
+		rdrif_err(sdr, "failed register subdev nodes ret %d\n", ret);
+		return ret;
+	}
+
+	v4l2_device_for_each_subdev(sd, &sdr->v4l2_dev) {
+		ret = v4l2_ctrl_add_handler(sdr->v4l2_dev.ctrl_handler,
+					    sd->ctrl_handler, NULL);
+		if (ret) {
+			rdrif_err(sdr, "failed ctrl add hdlr ret %d\n", ret);
+			return ret;
+		}
+	}
+	rdrif_dbg(2, sdr, "notify complete\n");
+	return 0;
+}
+
+/* Read endpoint properties */
+static void rcar_drif_get_ep_properties(struct rcar_drif_sdr *sdr,
+					struct device_node *np)
+{
+	u32 val;
+
+	/* Set the I2S defaults for SIRMDR1*/
+	sdr->mdr1 = RCAR_DRIF_SIRMDR1_SYNCMD_LR | RCAR_DRIF_SIRMDR1_MSB_FIRST |
+		RCAR_DRIF_SIRMDR1_DTDL_1 | RCAR_DRIF_SIRMDR1_SYNCDL_0;
+
+	/* Parse sync polarity from endpoint */
+	if (!of_property_read_u32(np, "renesas,sync-active", &val))
+		sdr->mdr1 |= val ? RCAR_DRIF_SIRMDR1_SYNCAC_POL_HIGH :
+			RCAR_DRIF_SIRMDR1_SYNCAC_POL_LOW;
+	else
+		sdr->mdr1 |= RCAR_DRIF_SIRMDR1_SYNCAC_POL_HIGH; /* default */
+
+	dev_dbg(sdr->dev, "mdr1 0x%08x\n", sdr->mdr1);
+}
+
+/* Parse sub-devs (tuner) to find a matching device */
+static int rcar_drif_parse_subdevs(struct rcar_drif_sdr *sdr,
+				   struct device *dev)
+{
+	struct v4l2_async_notifier *notifier = &sdr->notifier;
+	struct rcar_drif_async_subdev *rsd;
+	struct device_node *node;
+
+	notifier->subdevs = devm_kzalloc(dev, sizeof(*notifier->subdevs),
+					 GFP_KERNEL);
+	if (!notifier->subdevs)
+		return -ENOMEM;
+
+	node = of_graph_get_next_endpoint(dev->of_node, NULL);
+	if (!node)
+		return 0;
+
+	rsd = devm_kzalloc(dev, sizeof(*rsd), GFP_KERNEL);
+	if (!rsd) {
+		of_node_put(node);
+		return -ENOMEM;
+	}
+
+	notifier->subdevs[notifier->num_subdevs] = &rsd->asd;
+	rsd->asd.match.of.node = of_graph_get_remote_port_parent(node);
+	of_node_put(node);
+	if (!rsd->asd.match.of.node) {
+		dev_warn(dev, "bad remote port parent\n");
+		return -EINVAL;
+	}
+
+	rsd->asd.match_type = V4L2_ASYNC_MATCH_OF;
+	notifier->num_subdevs++;
+
+	/* Get the endpoint properties */
+	rcar_drif_get_ep_properties(sdr, node);
+	return 0;
+}
+
+/* Check if the given device is the primary bond */
+static bool rcar_drif_primary_bond(struct platform_device *pdev)
+{
+	if (of_find_property(pdev->dev.of_node, "renesas,primary-bond", NULL))
+		return true;
+
+	return false;
+}
+
+/* Get the bonded platform dev if enabled */
+static struct platform_device *rcar_drif_enabled_bond(struct platform_device *p)
+{
+	struct device_node *np;
+
+	np = of_parse_phandle(p->dev.of_node, "renesas,bonding", 0);
+	if (np && of_device_is_available(np))
+		return of_find_device_by_node(np);
+
+	return NULL;
+}
+
+/* Proble internal channel */
+static int rcar_drif_channel_probe(struct platform_device *pdev)
+{
+	struct rcar_drif *ch;
+	struct resource	*res;
+	void __iomem *base;
+	struct clk *clkp;
+	int ret;
+
+	/* Peripheral clock */
+	clkp = devm_clk_get(&pdev->dev, "fck");
+	if (IS_ERR(clkp)) {
+		ret = PTR_ERR(clkp);
+		dev_err(&pdev->dev, "clk get failed (%d)\n", ret);
+		return ret;
+	}
+
+	/* Register map */
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(base)) {
+		ret = PTR_ERR(base);
+		dev_err(&pdev->dev, "ioremap failed (%d)\n", ret);
+		return ret;
+	}
+
+	/* Reserve memory for enabled channel */
+	ch = devm_kzalloc(&pdev->dev, sizeof(*ch), GFP_KERNEL);
+	if (!ch) {
+		ret = PTR_ERR(ch);
+		dev_err(&pdev->dev, "failed alloc channel\n");
+		return ret;
+	}
+	ch->pdev = pdev;
+	ch->clkp = clkp;
+	ch->base = base;
+	ch->start = res->start;
+	platform_set_drvdata(pdev, ch);
+	return 0;
+}
+
+static int rcar_drif_probe(struct platform_device *pdev)
+{
+	struct rcar_drif *ch, *b_ch = NULL;
+	struct platform_device *b_pdev;
+	struct rcar_drif_sdr *sdr;
+	int ret;
+
+	/* Probe internal channel */
+	ret = rcar_drif_channel_probe(pdev);
+	if (ret)
+		return ret;
+
+	/* Check if both channels of the bond are enabled */
+	b_pdev = rcar_drif_enabled_bond(pdev);
+	if (b_pdev) {
+		/* Check if current channel acting as primary-bond */
+		if (!rcar_drif_primary_bond(pdev)) {
+			dev_notice(&pdev->dev, "probed\n");
+			return 0;
+		}
+
+		/* Check if the other device is probed */
+		b_ch = platform_get_drvdata(b_pdev);
+		if (!b_ch) {
+			dev_info(&pdev->dev, "defer probe\n");
+			return -EPROBE_DEFER;
+		}
+		/* Set the other channel number */
+		b_ch->num = 1;
+	}
+
+	/* Channel acting as SDR instance */
+	ch = platform_get_drvdata(pdev);
+	ch->acting_sdr = true;
+
+	/* Reserve memory for SDR structure */
+	sdr = devm_kzalloc(&pdev->dev, sizeof(*sdr), GFP_KERNEL);
+	if (!sdr) {
+		ret = PTR_ERR(sdr);
+		dev_err(&pdev->dev, "failed alloc drif context\n");
+		return ret;
+	}
+	sdr->dev = &pdev->dev;
+	sdr->hw_ch_mask = BIT(ch->num);
+
+	/* Establish links between SDR and channel(s) */
+	ch->sdr = sdr;
+	sdr->ch[ch->num] = ch;
+	if (b_ch) {
+		sdr->ch[b_ch->num] = b_ch;
+		b_ch->sdr = sdr;
+		sdr->hw_ch_mask |= BIT(b_ch->num);
+	}
+	sdr->num_hw_ch = hweight_long(sdr->hw_ch_mask);
+
+	/* Validate any supported format for enabled channels */
+	ret = rcar_drif_set_default_format(sdr);
+	if (ret) {
+		dev_err(sdr->dev, "failed to set default format\n");
+		return ret;
+	}
+
+	/* Set defaults */
+	sdr->hwbuf_size = RCAR_DRIF_DEFAULT_HWBUF_SIZE;
+
+	mutex_init(&sdr->v4l2_mutex);
+	mutex_init(&sdr->vb_queue_mutex);
+	spin_lock_init(&sdr->queued_bufs_lock);
+	INIT_LIST_HEAD(&sdr->queued_bufs);
+
+	/* Init videobuf2 queue structure */
+	sdr->vb_queue.type = V4L2_BUF_TYPE_SDR_CAPTURE;
+	sdr->vb_queue.io_modes = VB2_READ | VB2_MMAP | VB2_DMABUF;
+	sdr->vb_queue.drv_priv = sdr;
+	sdr->vb_queue.buf_struct_size = sizeof(struct rcar_drif_frame_buf);
+	sdr->vb_queue.ops = &rcar_drif_vb2_ops;
+	sdr->vb_queue.mem_ops = &vb2_vmalloc_memops;
+	sdr->vb_queue.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
+
+	/* Init videobuf2 queue */
+	ret = vb2_queue_init(&sdr->vb_queue);
+	if (ret) {
+		dev_err(sdr->dev, "could not initialize vb2 queue\n");
+		return ret;
+	}
+
+	/* Register the v4l2_device */
+	ret = v4l2_device_register(&pdev->dev, &sdr->v4l2_dev);
+	if (ret) {
+		dev_err(sdr->dev, "failed v4l2_device_register (%d)\n", ret);
+		return ret;
+	}
+
+	/*
+	 * Parse subdevs after v4l2_device_register because if the subdev
+	 * is already probed, bound and complete will be called immediately
+	 */
+	ret = rcar_drif_parse_subdevs(sdr, &pdev->dev);
+	if (ret)
+		goto err_unreg_v4l2;
+
+	sdr->notifier.bound = rcar_drif_notify_bound;
+	sdr->notifier.complete = rcar_drif_notify_complete;
+
+	v4l2_ctrl_handler_init(&sdr->ctrl_hdl, 10);
+
+	/* Register notifier */
+	ret = v4l2_async_notifier_register(&sdr->v4l2_dev, &sdr->notifier);
+	if (ret < 0) {
+		dev_err(sdr->dev, "notifier registration failed (%d)\n", ret);
+		goto err_free_ctrls;
+	}
+
+	/* Init video_device structure */
+	sdr->vdev = video_device_alloc();
+	if (!sdr->vdev) {
+		ret = -ENOMEM;
+		goto err_unreg_notif;
+	}
+	snprintf(sdr->vdev->name, sizeof(sdr->vdev->name), "R-Car DRIF");
+	sdr->vdev->fops = &rcar_drif_fops;
+	sdr->vdev->ioctl_ops = &rcar_drif_ioctl_ops;
+	sdr->vdev->release = video_device_release;
+	sdr->vdev->lock = &sdr->v4l2_mutex;
+	sdr->vdev->queue = &sdr->vb_queue;
+	sdr->vdev->queue->lock = &sdr->vb_queue_mutex;
+	sdr->vdev->ctrl_handler = &sdr->ctrl_hdl;
+	sdr->vdev->v4l2_dev = &sdr->v4l2_dev;
+	sdr->vdev->device_caps = V4L2_CAP_SDR_CAPTURE | V4L2_CAP_TUNER |
+		V4L2_CAP_STREAMING | V4L2_CAP_READWRITE;
+	video_set_drvdata(sdr->vdev, sdr);
+
+	/* Register V4L2 SDR device */
+	ret = video_register_device(sdr->vdev, VFL_TYPE_SDR, -1);
+	if (ret) {
+		dev_err(sdr->dev, "failed video_register_device (%d)\n", ret);
+		goto err_unreg_notif;
+	}
+
+	dev_notice(sdr->dev, "probed\n");
+	return 0;
+
+err_unreg_notif:
+	video_device_release(sdr->vdev);
+	v4l2_async_notifier_unregister(&sdr->notifier);
+err_free_ctrls:
+	v4l2_ctrl_handler_free(&sdr->ctrl_hdl);
+err_unreg_v4l2:
+	v4l2_device_unregister(&sdr->v4l2_dev);
+	return ret;
+}
+
+static int rcar_drif_remove(struct platform_device *pdev)
+{
+	struct rcar_drif *ch = platform_get_drvdata(pdev);
+	struct rcar_drif_sdr *sdr = ch->sdr;
+
+	if (!ch->acting_sdr) {
+		/* Nothing to do */
+		dev_notice(&pdev->dev, "removed\n");
+		return 0;
+	}
+
+	/* SDR instance */
+	v4l2_ctrl_handler_free(sdr->vdev->ctrl_handler);
+	v4l2_async_notifier_unregister(&sdr->notifier);
+	v4l2_device_unregister(&sdr->v4l2_dev);
+	video_unregister_device(sdr->vdev);
+	dev_notice(&pdev->dev, "removed\n");
+	return 0;
+}
+
+static int __maybe_unused rcar_drif_suspend(struct device *dev)
+{
+	return 0;
+}
+
+static int __maybe_unused rcar_drif_resume(struct device *dev)
+{
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(rcar_drif_pm_ops, rcar_drif_suspend,
+			 rcar_drif_resume);
+
+static const struct of_device_id rcar_drif_of_table[] = {
+	{ .compatible = "renesas,rcar-gen3-drif" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, rcar_drif_of_table);
+
+#define RCAR_DRIF_DRV_NAME "rcar_drif"
+static struct platform_driver rcar_drif_driver = {
+	.driver = {
+		.name = RCAR_DRIF_DRV_NAME,
+		.of_match_table = of_match_ptr(rcar_drif_of_table),
+		.pm = &rcar_drif_pm_ops,
+		},
+	.probe = rcar_drif_probe,
+	.remove = rcar_drif_remove,
+};
+
+module_platform_driver(rcar_drif_driver);
+
+MODULE_DESCRIPTION("Renesas R-Car Gen3 DRIF driver");
+MODULE_ALIAS("platform:" RCAR_DRIF_DRV_NAME);
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Ramesh Shanmugasundaram <ramesh.shanmugasundaram@bp.renesas.com>");
-- 
1.9.1