pxa_camera.c

/*
 * V4L2 Driver for PXA camera host
 *
 * Copyright (C) 2006, Sascha Hauer, Pengutronix
 * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
 * Copyright (C) 2016, Robert Jarzmik <robert.jarzmik@free.fr>
 *
 * 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.
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/io.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/err.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/moduleparam.h>
#include <linux/of.h>
#include <linux/time.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
#include <linux/dma/pxa-dma.h>

#include <media/v4l2-async.h>
#include <media/v4l2-clk.h>
#include <media/v4l2-common.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-of.h>

#include <media/drv-intf/soc_mediabus.h>
#include <media/videobuf2-dma-sg.h>

#include <linux/videodev2.h>

#include <linux/platform_data/media/camera-pxa.h>

#define PXA_CAM_VERSION "0.0.6"
#define PXA_CAM_DRV_NAME "pxa27x-camera"

#define DEFAULT_WIDTH	640
#define DEFAULT_HEIGHT	480

/* Camera Interface */
#define CICR0		0x0000
#define CICR1		0x0004
#define CICR2		0x0008
#define CICR3		0x000C
#define CICR4		0x0010
#define CISR		0x0014
#define CIFR		0x0018
#define CITOR		0x001C
#define CIBR0		0x0028
#define CIBR1		0x0030
#define CIBR2		0x0038

#define CICR0_DMAEN	(1 << 31)	/* DMA request enable */
#define CICR0_PAR_EN	(1 << 30)	/* Parity enable */
#define CICR0_SL_CAP_EN	(1 << 29)	/* Capture enable for slave mode */
#define CICR0_ENB	(1 << 28)	/* Camera interface enable */
#define CICR0_DIS	(1 << 27)	/* Camera interface disable */
#define CICR0_SIM	(0x7 << 24)	/* Sensor interface mode mask */
#define CICR0_TOM	(1 << 9)	/* Time-out mask */
#define CICR0_RDAVM	(1 << 8)	/* Receive-data-available mask */
#define CICR0_FEM	(1 << 7)	/* FIFO-empty mask */
#define CICR0_EOLM	(1 << 6)	/* End-of-line mask */
#define CICR0_PERRM	(1 << 5)	/* Parity-error mask */
#define CICR0_QDM	(1 << 4)	/* Quick-disable mask */
#define CICR0_CDM	(1 << 3)	/* Disable-done mask */
#define CICR0_SOFM	(1 << 2)	/* Start-of-frame mask */
#define CICR0_EOFM	(1 << 1)	/* End-of-frame mask */
#define CICR0_FOM	(1 << 0)	/* FIFO-overrun mask */

#define CICR1_TBIT	(1 << 31)	/* Transparency bit */
#define CICR1_RGBT_CONV	(0x3 << 29)	/* RGBT conversion mask */
#define CICR1_PPL	(0x7ff << 15)	/* Pixels per line mask */
#define CICR1_RGB_CONV	(0x7 << 12)	/* RGB conversion mask */
#define CICR1_RGB_F	(1 << 11)	/* RGB format */
#define CICR1_YCBCR_F	(1 << 10)	/* YCbCr format */
#define CICR1_RGB_BPP	(0x7 << 7)	/* RGB bis per pixel mask */
#define CICR1_RAW_BPP	(0x3 << 5)	/* Raw bis per pixel mask */
#define CICR1_COLOR_SP	(0x3 << 3)	/* Color space mask */
#define CICR1_DW	(0x7 << 0)	/* Data width mask */

#define CICR2_BLW	(0xff << 24)	/* Beginning-of-line pixel clock
					   wait count mask */
#define CICR2_ELW	(0xff << 16)	/* End-of-line pixel clock
					   wait count mask */
#define CICR2_HSW	(0x3f << 10)	/* Horizontal sync pulse width mask */
#define CICR2_BFPW	(0x3f << 3)	/* Beginning-of-frame pixel clock
					   wait count mask */
#define CICR2_FSW	(0x7 << 0)	/* Frame stabilization
					   wait count mask */

#define CICR3_BFW	(0xff << 24)	/* Beginning-of-frame line clock
					   wait count mask */
#define CICR3_EFW	(0xff << 16)	/* End-of-frame line clock
					   wait count mask */
#define CICR3_VSW	(0x3f << 10)	/* Vertical sync pulse width mask */
#define CICR3_BFPW	(0x3f << 3)	/* Beginning-of-frame pixel clock
					   wait count mask */
#define CICR3_LPF	(0x7ff << 0)	/* Lines per frame mask */

#define CICR4_MCLK_DLY	(0x3 << 24)	/* MCLK Data Capture Delay mask */
#define CICR4_PCLK_EN	(1 << 23)	/* Pixel clock enable */
#define CICR4_PCP	(1 << 22)	/* Pixel clock polarity */
#define CICR4_HSP	(1 << 21)	/* Horizontal sync polarity */
#define CICR4_VSP	(1 << 20)	/* Vertical sync polarity */
#define CICR4_MCLK_EN	(1 << 19)	/* MCLK enable */
#define CICR4_FR_RATE	(0x7 << 8)	/* Frame rate mask */
#define CICR4_DIV	(0xff << 0)	/* Clock divisor mask */

#define CISR_FTO	(1 << 15)	/* FIFO time-out */
#define CISR_RDAV_2	(1 << 14)	/* Channel 2 receive data available */
#define CISR_RDAV_1	(1 << 13)	/* Channel 1 receive data available */
#define CISR_RDAV_0	(1 << 12)	/* Channel 0 receive data available */
#define CISR_FEMPTY_2	(1 << 11)	/* Channel 2 FIFO empty */
#define CISR_FEMPTY_1	(1 << 10)	/* Channel 1 FIFO empty */
#define CISR_FEMPTY_0	(1 << 9)	/* Channel 0 FIFO empty */
#define CISR_EOL	(1 << 8)	/* End of line */
#define CISR_PAR_ERR	(1 << 7)	/* Parity error */
#define CISR_CQD	(1 << 6)	/* Camera interface quick disable */
#define CISR_CDD	(1 << 5)	/* Camera interface disable done */
#define CISR_SOF	(1 << 4)	/* Start of frame */
#define CISR_EOF	(1 << 3)	/* End of frame */
#define CISR_IFO_2	(1 << 2)	/* FIFO overrun for Channel 2 */
#define CISR_IFO_1	(1 << 1)	/* FIFO overrun for Channel 1 */
#define CISR_IFO_0	(1 << 0)	/* FIFO overrun for Channel 0 */

#define CIFR_FLVL2	(0x7f << 23)	/* FIFO 2 level mask */
#define CIFR_FLVL1	(0x7f << 16)	/* FIFO 1 level mask */
#define CIFR_FLVL0	(0xff << 8)	/* FIFO 0 level mask */
#define CIFR_THL_0	(0x3 << 4)	/* Threshold Level for Channel 0 FIFO */
#define CIFR_RESET_F	(1 << 3)	/* Reset input FIFOs */
#define CIFR_FEN2	(1 << 2)	/* FIFO enable for channel 2 */
#define CIFR_FEN1	(1 << 1)	/* FIFO enable for channel 1 */
#define CIFR_FEN0	(1 << 0)	/* FIFO enable for channel 0 */

#define CICR0_SIM_MP	(0 << 24)
#define CICR0_SIM_SP	(1 << 24)
#define CICR0_SIM_MS	(2 << 24)
#define CICR0_SIM_EP	(3 << 24)
#define CICR0_SIM_ES	(4 << 24)

#define CICR1_DW_VAL(x)   ((x) & CICR1_DW)	    /* Data bus width */
#define CICR1_PPL_VAL(x)  (((x) << 15) & CICR1_PPL) /* Pixels per line */
#define CICR1_COLOR_SP_VAL(x)	(((x) << 3) & CICR1_COLOR_SP)	/* color space */
#define CICR1_RGB_BPP_VAL(x)	(((x) << 7) & CICR1_RGB_BPP)	/* bpp for rgb */
#define CICR1_RGBT_CONV_VAL(x)	(((x) << 29) & CICR1_RGBT_CONV)	/* rgbt conv */

#define CICR2_BLW_VAL(x)  (((x) << 24) & CICR2_BLW) /* Beginning-of-line pixel clock wait count */
#define CICR2_ELW_VAL(x)  (((x) << 16) & CICR2_ELW) /* End-of-line pixel clock wait count */
#define CICR2_HSW_VAL(x)  (((x) << 10) & CICR2_HSW) /* Horizontal sync pulse width */
#define CICR2_BFPW_VAL(x) (((x) << 3) & CICR2_BFPW) /* Beginning-of-frame pixel clock wait count */
#define CICR2_FSW_VAL(x)  (((x) << 0) & CICR2_FSW)  /* Frame stabilization wait count */

#define CICR3_BFW_VAL(x)  (((x) << 24) & CICR3_BFW) /* Beginning-of-frame line clock wait count  */
#define CICR3_EFW_VAL(x)  (((x) << 16) & CICR3_EFW) /* End-of-frame line clock wait count */
#define CICR3_VSW_VAL(x)  (((x) << 11) & CICR3_VSW) /* Vertical sync pulse width */
#define CICR3_LPF_VAL(x)  (((x) << 0) & CICR3_LPF)  /* Lines per frame */

#define CICR0_IRQ_MASK (CICR0_TOM | CICR0_RDAVM | CICR0_FEM | CICR0_EOLM | \
			CICR0_PERRM | CICR0_QDM | CICR0_CDM | CICR0_SOFM | \
			CICR0_EOFM | CICR0_FOM)

#define sensor_call(cam, o, f, args...) \
	v4l2_subdev_call(cam->sensor, o, f, ##args)

/*
 * Format handling
 */
/**
 * struct soc_camera_format_xlate - match between host and sensor formats
 * @code: code of a sensor provided format
 * @host_fmt: host format after host translation from code
 *
 * Host and sensor translation structure. Used in table of host and sensor
 * formats matchings in soc_camera_device. A host can override the generic list
 * generation by implementing get_formats(), and use it for format checks and
 * format setup.
 */
struct soc_camera_format_xlate {
	u32 code;
	const struct soc_mbus_pixelfmt *host_fmt;
};

/*
 * Structures
 */
enum pxa_camera_active_dma {
	DMA_Y = 0x1,
	DMA_U = 0x2,
	DMA_V = 0x4,
};

/* buffer for one video frame */
struct pxa_buffer {
	/* common v4l buffer stuff -- must be first */
	struct vb2_v4l2_buffer		vbuf;
	struct list_head		queue;
	u32	code;
	int				nb_planes;
	/* our descriptor lists for Y, U and V channels */
	struct dma_async_tx_descriptor	*descs[3];
	dma_cookie_t			cookie[3];
	struct scatterlist		*sg[3];
	int				sg_len[3];
	size_t				plane_sizes[3];
	int				inwork;
	enum pxa_camera_active_dma	active_dma;
};

struct pxa_camera_dev {
	struct v4l2_device	v4l2_dev;
	struct video_device	vdev;
	struct v4l2_async_notifier notifier;
	struct vb2_queue	vb2_vq;
	struct v4l2_subdev	*sensor;
	struct soc_camera_format_xlate *user_formats;
	const struct soc_camera_format_xlate *current_fmt;
	struct v4l2_pix_format	current_pix;

	struct v4l2_async_subdev asd;
	struct v4l2_async_subdev *asds[1];

	/*
	 * PXA27x is only supposed to handle one camera on its Quick Capture
	 * interface. If anyone ever builds hardware to enable more than
	 * one camera, they will have to modify this driver too
	 */
	struct clk		*clk;

	unsigned int		irq;
	void __iomem		*base;

	int			channels;
	struct dma_chan		*dma_chans[3];

	struct pxacamera_platform_data *pdata;
	struct resource		*res;
	unsigned long		platform_flags;
	unsigned long		ciclk;
	unsigned long		mclk;
	u32			mclk_divisor;
	struct v4l2_clk		*mclk_clk;
	u16			width_flags;	/* max 10 bits */

	struct list_head	capture;

	spinlock_t		lock;
	struct mutex		mlock;
	unsigned int		buf_sequence;

	struct pxa_buffer	*active;
	struct tasklet_struct	task_eof;

	u32			save_cicr[5];
};

struct pxa_cam {
	unsigned long flags;
};

static const char *pxa_cam_driver_description = "PXA_Camera";

/*
 * Format translation functions
 */
const struct soc_camera_format_xlate *soc_mbus_xlate_by_fourcc(
	struct soc_camera_format_xlate *user_formats, unsigned int fourcc)
{
	unsigned int i;

	for (i = 0; user_formats[i].code; i++)
		if (user_formats[i].host_fmt->fourcc == fourcc)
			return user_formats + i;
	return NULL;
}

static struct soc_camera_format_xlate *soc_mbus_build_fmts_xlate(
	struct v4l2_device *v4l2_dev, struct v4l2_subdev *subdev,
	int (*get_formats)(struct v4l2_device *, unsigned int,
			   struct soc_camera_format_xlate *xlate))
{
	unsigned int i, fmts = 0, raw_fmts = 0;
	int ret;
	struct v4l2_subdev_mbus_code_enum code = {
		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
	};
	struct soc_camera_format_xlate *user_formats;

	while (!v4l2_subdev_call(subdev, pad, enum_mbus_code, NULL, &code)) {
		raw_fmts++;
		code.index++;
	}

	/*
	 * First pass - only count formats this host-sensor
	 * configuration can provide
	 */
	for (i = 0; i < raw_fmts; i++) {
		ret = get_formats(v4l2_dev, i, NULL);
		if (ret < 0)
			return ERR_PTR(ret);
		fmts += ret;
	}

	if (!fmts)
		return ERR_PTR(-ENXIO);

	user_formats = kcalloc(fmts + 1, sizeof(*user_formats), GFP_KERNEL);
	if (!user_formats)
		return ERR_PTR(-ENOMEM);

	/* Second pass - actually fill data formats */
	fmts = 0;
	for (i = 0; i < raw_fmts; i++) {
		ret = get_formats(v4l2_dev, i, user_formats + fmts);
		if (ret < 0)
			goto egfmt;
		fmts += ret;
	}
	user_formats[fmts].code = 0;

	return user_formats;
egfmt:
	kfree(user_formats);
	return ERR_PTR(ret);
}

/*
 *  Videobuf operations
 */
static struct pxa_buffer *vb2_to_pxa_buffer(struct vb2_buffer *vb)
{
	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);

	return container_of(vbuf, struct pxa_buffer, vbuf);
}

static struct device *pcdev_to_dev(struct pxa_camera_dev *pcdev)
{
	return pcdev->v4l2_dev.dev;
}

static struct pxa_camera_dev *v4l2_dev_to_pcdev(struct v4l2_device *v4l2_dev)
{
	return container_of(v4l2_dev, struct pxa_camera_dev, v4l2_dev);
}

static void pxa_camera_dma_irq(struct pxa_camera_dev *pcdev,
			       enum pxa_camera_active_dma act_dma);

static void pxa_camera_dma_irq_y(void *data)
{
	struct pxa_camera_dev *pcdev = data;

	pxa_camera_dma_irq(pcdev, DMA_Y);
}

static void pxa_camera_dma_irq_u(void *data)
{
	struct pxa_camera_dev *pcdev = data;

	pxa_camera_dma_irq(pcdev, DMA_U);
}

static void pxa_camera_dma_irq_v(void *data)
{
	struct pxa_camera_dev *pcdev = data;

	pxa_camera_dma_irq(pcdev, DMA_V);
}

/**
 * pxa_init_dma_channel - init dma descriptors
 * @pcdev: pxa camera device
 * @vb: videobuffer2 buffer
 * @dma: dma video buffer
 * @channel: dma channel (0 => 'Y', 1 => 'U', 2 => 'V')
 * @cibr: camera Receive Buffer Register
 *
 * Prepares the pxa dma descriptors to transfer one camera channel.
 *
 * Returns 0 if success or -ENOMEM if no memory is available
 */
static int pxa_init_dma_channel(struct pxa_camera_dev *pcdev,
				struct pxa_buffer *buf, int channel,
				struct scatterlist *sg, int sglen)
{
	struct dma_chan *dma_chan = pcdev->dma_chans[channel];
	struct dma_async_tx_descriptor *tx;

	tx = dmaengine_prep_slave_sg(dma_chan, sg, sglen, DMA_DEV_TO_MEM,
				     DMA_PREP_INTERRUPT | DMA_CTRL_REUSE);
	if (!tx) {
		dev_err(pcdev_to_dev(pcdev),
			"dmaengine_prep_slave_sg failed\n");
		goto fail;
	}

	tx->callback_param = pcdev;
	switch (channel) {
	case 0:
		tx->callback = pxa_camera_dma_irq_y;
		break;
	case 1:
		tx->callback = pxa_camera_dma_irq_u;
		break;
	case 2:
		tx->callback = pxa_camera_dma_irq_v;
		break;
	}

	buf->descs[channel] = tx;
	return 0;
fail:
	dev_dbg(pcdev_to_dev(pcdev),
		"%s (vb=%p) dma_tx=%p\n",
		__func__, buf, tx);

	return -ENOMEM;
}

static void pxa_videobuf_set_actdma(struct pxa_camera_dev *pcdev,
				    struct pxa_buffer *buf)
{
	buf->active_dma = DMA_Y;
	if (buf->nb_planes == 3)
		buf->active_dma |= DMA_U | DMA_V;
}

/**
 * pxa_dma_start_channels - start DMA channel for active buffer
 * @pcdev: pxa camera device
 *
 * Initialize DMA channels to the beginning of the active video buffer, and
 * start these channels.
 */
static void pxa_dma_start_channels(struct pxa_camera_dev *pcdev)
{
	int i;
	struct pxa_buffer *active;

	active = pcdev->active;

	for (i = 0; i < pcdev->channels; i++) {
		dev_dbg(pcdev_to_dev(pcdev),
			"%s (channel=%d)\n", __func__, i);
		dma_async_issue_pending(pcdev->dma_chans[i]);
	}
}

static void pxa_dma_stop_channels(struct pxa_camera_dev *pcdev)
{
	int i;

	for (i = 0; i < pcdev->channels; i++) {
		dev_dbg(pcdev_to_dev(pcdev),
			"%s (channel=%d)\n", __func__, i);
		dmaengine_terminate_all(pcdev->dma_chans[i]);
	}
}

static void pxa_dma_add_tail_buf(struct pxa_camera_dev *pcdev,
				 struct pxa_buffer *buf)
{
	int i;

	for (i = 0; i < pcdev->channels; i++) {
		buf->cookie[i] = dmaengine_submit(buf->descs[i]);
		dev_dbg(pcdev_to_dev(pcdev),
			"%s (channel=%d) : submit vb=%p cookie=%d\n",
			__func__, i, buf, buf->descs[i]->cookie);
	}
}

/**
 * pxa_camera_start_capture - start video capturing
 * @pcdev: camera device
 *
 * Launch capturing. DMA channels should not be active yet. They should get
 * activated at the end of frame interrupt, to capture only whole frames, and
 * never begin the capture of a partial frame.
 */
static void pxa_camera_start_capture(struct pxa_camera_dev *pcdev)
{
	unsigned long cicr0;

	dev_dbg(pcdev_to_dev(pcdev), "%s\n", __func__);
	__raw_writel(__raw_readl(pcdev->base + CISR), pcdev->base + CISR);
	/* Enable End-Of-Frame Interrupt */
	cicr0 = __raw_readl(pcdev->base + CICR0) | CICR0_ENB;
	cicr0 &= ~CICR0_EOFM;
	__raw_writel(cicr0, pcdev->base + CICR0);
}

static void pxa_camera_stop_capture(struct pxa_camera_dev *pcdev)
{
	unsigned long cicr0;

	pxa_dma_stop_channels(pcdev);

	cicr0 = __raw_readl(pcdev->base + CICR0) & ~CICR0_ENB;
	__raw_writel(cicr0, pcdev->base + CICR0);

	pcdev->active = NULL;
	dev_dbg(pcdev_to_dev(pcdev), "%s\n", __func__);
}

static void pxa_camera_wakeup(struct pxa_camera_dev *pcdev,
			      struct pxa_buffer *buf,
			      enum vb2_buffer_state state)
{
	struct vb2_buffer *vb = &buf->vbuf.vb2_buf;
	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);

	/* _init is used to debug races, see comment in pxa_camera_reqbufs() */
	list_del_init(&buf->queue);
	vb->timestamp = ktime_get_ns();
	vbuf->sequence = pcdev->buf_sequence++;
	vbuf->field = V4L2_FIELD_NONE;
	vb2_buffer_done(vb, VB2_BUF_STATE_DONE);
	dev_dbg(pcdev_to_dev(pcdev), "%s dequeud buffer (buf=0x%p)\n",
		__func__, buf);

	if (list_empty(&pcdev->capture)) {
		pxa_camera_stop_capture(pcdev);
		return;
	}

	pcdev->active = list_entry(pcdev->capture.next,
				   struct pxa_buffer, queue);
}

/**
 * pxa_camera_check_link_miss - check missed DMA linking
 * @pcdev: camera device
 *
 * The DMA chaining is done with DMA running. This means a tiny temporal window
 * remains, where a buffer is queued on the chain, while the chain is already
 * stopped. This means the tailed buffer would never be transferred by DMA.
 * This function restarts the capture for this corner case, where :
 *  - DADR() == DADDR_STOP
 *  - a videobuffer is queued on the pcdev->capture list
 *
 * Please check the "DMA hot chaining timeslice issue" in
 *   Documentation/video4linux/pxa_camera.txt
 *
 * Context: should only be called within the dma irq handler
 */
static void pxa_camera_check_link_miss(struct pxa_camera_dev *pcdev,
				       dma_cookie_t last_submitted,
				       dma_cookie_t last_issued)
{
	bool is_dma_stopped = last_submitted != last_issued;

	dev_dbg(pcdev_to_dev(pcdev),
		"%s : top queued buffer=%p, is_dma_stopped=%d\n",
		__func__, pcdev->active, is_dma_stopped);

	if (pcdev->active && is_dma_stopped)
		pxa_camera_start_capture(pcdev);
}

static void pxa_camera_dma_irq(struct pxa_camera_dev *pcdev,
			       enum pxa_camera_active_dma act_dma)
{
	struct pxa_buffer *buf, *last_buf;
	unsigned long flags;
	u32 camera_status, overrun;
	int chan;
	enum dma_status last_status;
	dma_cookie_t last_issued;

	spin_lock_irqsave(&pcdev->lock, flags);

	camera_status = __raw_readl(pcdev->base + CISR);
	dev_dbg(pcdev_to_dev(pcdev), "camera dma irq, cisr=0x%x dma=%d\n",
		camera_status, act_dma);
	overrun = CISR_IFO_0;
	if (pcdev->channels == 3)
		overrun |= CISR_IFO_1 | CISR_IFO_2;

	/*
	 * pcdev->active should not be NULL in DMA irq handler.
	 *
	 * But there is one corner case : if capture was stopped due to an
	 * overrun of channel 1, and at that same channel 2 was completed.
	 *
	 * When handling the overrun in DMA irq for channel 1, we'll stop the
	 * capture and restart it (and thus set pcdev->active to NULL). But the
	 * DMA irq handler will already be pending for channel 2. So on entering
	 * the DMA irq handler for channel 2 there will be no active buffer, yet
	 * that is normal.
	 */
	if (!pcdev->active)
		goto out;

	buf = pcdev->active;
	WARN_ON(buf->inwork || list_empty(&buf->queue));

	/*
	 * It's normal if the last frame creates an overrun, as there
	 * are no more DMA descriptors to fetch from QCI fifos
	 */
	switch (act_dma) {
	case DMA_U:
		chan = 1;
		break;
	case DMA_V:
		chan = 2;
		break;
	default:
		chan = 0;
		break;
	}
	last_buf = list_entry(pcdev->capture.prev,
			      struct pxa_buffer, queue);
	last_status = dma_async_is_tx_complete(pcdev->dma_chans[chan],
					       last_buf->cookie[chan],
					       NULL, &last_issued);
	if (camera_status & overrun &&
	    last_status != DMA_COMPLETE) {
		dev_dbg(pcdev_to_dev(pcdev), "FIFO overrun! CISR: %x\n",
			camera_status);
		pxa_camera_stop_capture(pcdev);
		list_for_each_entry(buf, &pcdev->capture, queue)
			pxa_dma_add_tail_buf(pcdev, buf);
		pxa_camera_start_capture(pcdev);
		goto out;
	}
	buf->active_dma &= ~act_dma;
	if (!buf->active_dma) {
		pxa_camera_wakeup(pcdev, buf, VB2_BUF_STATE_DONE);
		pxa_camera_check_link_miss(pcdev, last_buf->cookie[chan],
					   last_issued);
	}

out:
	spin_unlock_irqrestore(&pcdev->lock, flags);
}

static u32 mclk_get_divisor(struct platform_device *pdev,
			    struct pxa_camera_dev *pcdev)
{
	unsigned long mclk = pcdev->mclk;
	u32 div;
	unsigned long lcdclk;

	lcdclk = clk_get_rate(pcdev->clk);
	pcdev->ciclk = lcdclk;

	/* mclk <= ciclk / 4 (27.4.2) */
	if (mclk > lcdclk / 4) {
		mclk = lcdclk / 4;
		dev_warn(pcdev_to_dev(pcdev),
			 "Limiting master clock to %lu\n", mclk);
	}

	/* We verify mclk != 0, so if anyone breaks it, here comes their Oops */
	div = (lcdclk + 2 * mclk - 1) / (2 * mclk) - 1;

	/* If we're not supplying MCLK, leave it at 0 */
	if (pcdev->platform_flags & PXA_CAMERA_MCLK_EN)
		pcdev->mclk = lcdclk / (2 * (div + 1));

	dev_dbg(pcdev_to_dev(pcdev), "LCD clock %luHz, target freq %luHz, divisor %u\n",
		lcdclk, mclk, div);

	return div;
}

static void recalculate_fifo_timeout(struct pxa_camera_dev *pcdev,
				     unsigned long pclk)
{
	/* We want a timeout > 1 pixel time, not ">=" */
	u32 ciclk_per_pixel = pcdev->ciclk / pclk + 1;

	__raw_writel(ciclk_per_pixel, pcdev->base + CITOR);
}

static void pxa_camera_activate(struct pxa_camera_dev *pcdev)
{
	u32 cicr4 = 0;

	/* disable all interrupts */
	__raw_writel(0x3ff, pcdev->base + CICR0);

	if (pcdev->platform_flags & PXA_CAMERA_PCLK_EN)
		cicr4 |= CICR4_PCLK_EN;
	if (pcdev->platform_flags & PXA_CAMERA_MCLK_EN)
		cicr4 |= CICR4_MCLK_EN;
	if (pcdev->platform_flags & PXA_CAMERA_PCP)
		cicr4 |= CICR4_PCP;
	if (pcdev->platform_flags & PXA_CAMERA_HSP)
		cicr4 |= CICR4_HSP;
	if (pcdev->platform_flags & PXA_CAMERA_VSP)
		cicr4 |= CICR4_VSP;

	__raw_writel(pcdev->mclk_divisor | cicr4, pcdev->base + CICR4);

	if (pcdev->platform_flags & PXA_CAMERA_MCLK_EN)
		/* Initialise the timeout under the assumption pclk = mclk */
		recalculate_fifo_timeout(pcdev, pcdev->mclk);
	else
		/* "Safe default" - 13MHz */
		recalculate_fifo_timeout(pcdev, 13000000);

	clk_prepare_enable(pcdev->clk);
}

static void pxa_camera_deactivate(struct pxa_camera_dev *pcdev)
{
	clk_disable_unprepare(pcdev->clk);
}

static void pxa_camera_eof(unsigned long arg)
{
	struct pxa_camera_dev *pcdev = (struct pxa_camera_dev *)arg;
	unsigned long cifr;
	struct pxa_buffer *buf;

	dev_dbg(pcdev_to_dev(pcdev),
		"Camera interrupt status 0x%x\n",
		__raw_readl(pcdev->base + CISR));

	/* Reset the FIFOs */
	cifr = __raw_readl(pcdev->base + CIFR) | CIFR_RESET_F;
	__raw_writel(cifr, pcdev->base + CIFR);

	pcdev->active = list_first_entry(&pcdev->capture,
					 struct pxa_buffer, queue);
	buf = pcdev->active;
	pxa_videobuf_set_actdma(pcdev, buf);

	pxa_dma_start_channels(pcdev);
}

static irqreturn_t pxa_camera_irq(int irq, void *data)
{
	struct pxa_camera_dev *pcdev = data;
	unsigned long status, cicr0;

	status = __raw_readl(pcdev->base + CISR);
	dev_dbg(pcdev_to_dev(pcdev),
		"Camera interrupt status 0x%lx\n", status);

	if (!status)
		return IRQ_NONE;

	__raw_writel(status, pcdev->base + CISR);

	if (status & CISR_EOF) {
		cicr0 = __raw_readl(pcdev->base + CICR0) | CICR0_EOFM;
		__raw_writel(cicr0, pcdev->base + CICR0);
		tasklet_schedule(&pcdev->task_eof);
	}

	return IRQ_HANDLED;
}

static int test_platform_param(struct pxa_camera_dev *pcdev,
			       unsigned char buswidth, unsigned long *flags)
{
	/*
	 * Platform specified synchronization and pixel clock polarities are
	 * only a recommendation and are only used during probing. The PXA270
	 * quick capture interface supports both.
	 */
	*flags = (pcdev->platform_flags & PXA_CAMERA_MASTER ?
		  V4L2_MBUS_MASTER : V4L2_MBUS_SLAVE) |
		V4L2_MBUS_HSYNC_ACTIVE_HIGH |
		V4L2_MBUS_HSYNC_ACTIVE_LOW |
		V4L2_MBUS_VSYNC_ACTIVE_HIGH |
		V4L2_MBUS_VSYNC_ACTIVE_LOW |
		V4L2_MBUS_DATA_ACTIVE_HIGH |
		V4L2_MBUS_PCLK_SAMPLE_RISING |
		V4L2_MBUS_PCLK_SAMPLE_FALLING;

	/* If requested data width is supported by the platform, use it */
	if ((1 << (buswidth - 1)) & pcdev->width_flags)
		return 0;

	return -EINVAL;
}

static void pxa_camera_setup_cicr(struct pxa_camera_dev *pcdev,
				  unsigned long flags, __u32 pixfmt)
{
	unsigned long dw, bpp;
	u32 cicr0, cicr1, cicr2, cicr3, cicr4 = 0, y_skip_top;
	int ret = sensor_call(pcdev, sensor, g_skip_top_lines, &y_skip_top);

	if (ret < 0)
		y_skip_top = 0;

	/*
	 * Datawidth is now guaranteed to be equal to one of the three values.
	 * We fix bit-per-pixel equal to data-width...
	 */
	switch (pcdev->current_fmt->host_fmt->bits_per_sample) {
	case 10:
		dw = 4;
		bpp = 0x40;
		break;
	case 9:
		dw = 3;
		bpp = 0x20;
		break;
	default:
		/*
		 * Actually it can only be 8 now,
		 * default is just to silence compiler warnings
		 */
	case 8:
		dw = 2;
		bpp = 0;
	}

	if (pcdev->platform_flags & PXA_CAMERA_PCLK_EN)
		cicr4 |= CICR4_PCLK_EN;
	if (pcdev->platform_flags & PXA_CAMERA_MCLK_EN)
		cicr4 |= CICR4_MCLK_EN;
	if (flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)
		cicr4 |= CICR4_PCP;
	if (flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)
		cicr4 |= CICR4_HSP;
	if (flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)
		cicr4 |= CICR4_VSP;

	cicr0 = __raw_readl(pcdev->base + CICR0);
	if (cicr0 & CICR0_ENB)
		__raw_writel(cicr0 & ~CICR0_ENB, pcdev->base + CICR0);

	cicr1 = CICR1_PPL_VAL(pcdev->current_pix.width - 1) | bpp | dw;

	switch (pixfmt) {
	case V4L2_PIX_FMT_YUV422P:
		pcdev->channels = 3;
		cicr1 |= CICR1_YCBCR_F;
		/*
		 * Normally, pxa bus wants as input UYVY format. We allow all
		 * reorderings of the YUV422 format, as no processing is done,
		 * and the YUV stream is just passed through without any
		 * transformation. Note that UYVY is the only format that
		 * should be used if pxa framebuffer Overlay2 is used.
		 */
	case V4L2_PIX_FMT_UYVY:
	case V4L2_PIX_FMT_VYUY:
	case V4L2_PIX_FMT_YUYV:
	case V4L2_PIX_FMT_YVYU:
		cicr1 |= CICR1_COLOR_SP_VAL(2);
		break;
	case V4L2_PIX_FMT_RGB555:
		cicr1 |= CICR1_RGB_BPP_VAL(1) | CICR1_RGBT_CONV_VAL(2) |
			CICR1_TBIT | CICR1_COLOR_SP_VAL(1);
		break;
	case V4L2_PIX_FMT_RGB565:
		cicr1 |= CICR1_COLOR_SP_VAL(1) | CICR1_RGB_BPP_VAL(2);
		break;
	}

	cicr2 = 0;
	cicr3 = CICR3_LPF_VAL(pcdev->current_pix.height - 1) |
		CICR3_BFW_VAL(min((u32)255, y_skip_top));
	cicr4 |= pcdev->mclk_divisor;

	__raw_writel(cicr1, pcdev->base + CICR1);
	__raw_writel(cicr2, pcdev->base + CICR2);
	__raw_writel(cicr3, pcdev->base + CICR3);
	__raw_writel(cicr4, pcdev->base + CICR4);

	/* CIF interrupts are not used, only DMA */
	cicr0 = (cicr0 & CICR0_ENB) | (pcdev->platform_flags & PXA_CAMERA_MASTER ?
		CICR0_SIM_MP : (CICR0_SL_CAP_EN | CICR0_SIM_SP));
	cicr0 |= CICR0_DMAEN | CICR0_IRQ_MASK;
	__raw_writel(cicr0, pcdev->base + CICR0);
}

/*
 * Videobuf2 section
 */
static void pxa_buffer_cleanup(struct pxa_buffer *buf)
{
	int i;

	for (i = 0; i < 3 && buf->descs[i]; i++) {
		dmaengine_desc_free(buf->descs[i]);
		kfree(buf->sg[i]);
		buf->descs[i] = NULL;
		buf->sg[i] = NULL;
		buf->sg_len[i] = 0;
		buf->plane_sizes[i] = 0;
	}
	buf->nb_planes = 0;
}

static int pxa_buffer_init(struct pxa_camera_dev *pcdev,
			   struct pxa_buffer *buf)
{
	struct vb2_buffer *vb = &buf->vbuf.vb2_buf;
	struct sg_table *sgt = vb2_dma_sg_plane_desc(vb, 0);
	int nb_channels = pcdev->channels;
	int i, ret = 0;
	unsigned long size = vb2_plane_size(vb, 0);

	switch (nb_channels) {
	case 1:
		buf->plane_sizes[0] = size;
		break;
	case 3:
		buf->plane_sizes[0] = size / 2;
		buf->plane_sizes[1] = size / 4;
		buf->plane_sizes[2] = size / 4;
		break;
	default:
		return -EINVAL;
	};
	buf->nb_planes = nb_channels;

	ret = sg_split(sgt->sgl, sgt->nents, 0, nb_channels,
		       buf->plane_sizes, buf->sg, buf->sg_len, GFP_KERNEL);
	if (ret < 0) {
		dev_err(pcdev_to_dev(pcdev),
			"sg_split failed: %d\n", ret);
		return ret;
	}
	for (i = 0; i < nb_channels; i++) {
		ret = pxa_init_dma_channel(pcdev, buf, i,
					   buf->sg[i], buf->sg_len[i]);
		if (ret) {
			pxa_buffer_cleanup(buf);
			return ret;
		}
	}
	INIT_LIST_HEAD(&buf->queue);

	return ret;
}

static void pxac_vb2_cleanup(struct vb2_buffer *vb)
{
	struct pxa_buffer *buf = vb2_to_pxa_buffer(vb);
	struct pxa_camera_dev *pcdev = vb2_get_drv_priv(vb->vb2_queue);

	dev_dbg(pcdev_to_dev(pcdev),
		 "%s(vb=%p)\n", __func__, vb);
	pxa_buffer_cleanup(buf);
}

static void pxac_vb2_queue(struct vb2_buffer *vb)
{
	struct pxa_buffer *buf = vb2_to_pxa_buffer(vb);
	struct pxa_camera_dev *pcdev = vb2_get_drv_priv(vb->vb2_queue);

	dev_dbg(pcdev_to_dev(pcdev),
		 "%s(vb=%p) nb_channels=%d size=%lu active=%p\n",
		__func__, vb, pcdev->channels, vb2_get_plane_payload(vb, 0),
		pcdev->active);

	list_add_tail(&buf->queue, &pcdev->capture);

	pxa_dma_add_tail_buf(pcdev, buf);
}

/*
 * Please check the DMA prepared buffer structure in :
 *   Documentation/video4linux/pxa_camera.txt
 * Please check also in pxa_camera_check_link_miss() to understand why DMA chain
 * modification while DMA chain is running will work anyway.
 */
static int pxac_vb2_prepare(struct vb2_buffer *vb)
{
	struct pxa_camera_dev *pcdev = vb2_get_drv_priv(vb->vb2_queue);
	struct pxa_buffer *buf = vb2_to_pxa_buffer(vb);
	int ret = 0;

	switch (pcdev->channels) {
	case 1:
	case 3:
		vb2_set_plane_payload(vb, 0, pcdev->current_pix.sizeimage);
		break;
	default:
		return -EINVAL;
	}

	dev_dbg(pcdev_to_dev(pcdev),
		 "%s (vb=%p) nb_channels=%d size=%lu\n",
		__func__, vb, pcdev->channels, vb2_get_plane_payload(vb, 0));

	WARN_ON(!pcdev->current_fmt);

#ifdef DEBUG
	/*
	 * This can be useful if you want to see if we actually fill
	 * the buffer with something
	 */
	for (i = 0; i < vb->num_planes; i++)
		memset((void *)vb2_plane_vaddr(vb, i),
		       0xaa, vb2_get_plane_payload(vb, i));
#endif

	/*
	 * I think, in buf_prepare you only have to protect global data,
	 * the actual buffer is yours
	 */
	buf->inwork = 0;
	pxa_videobuf_set_actdma(pcdev, buf);

	return ret;
}

static int pxac_vb2_init(struct vb2_buffer *vb)
{
	struct pxa_camera_dev *pcdev = vb2_get_drv_priv(vb->vb2_queue);
	struct pxa_buffer *buf = vb2_to_pxa_buffer(vb);

	dev_dbg(pcdev_to_dev(pcdev),
		 "%s(nb_channels=%d)\n",
		__func__, pcdev->channels);

	return pxa_buffer_init(pcdev, buf);
}

static int pxac_vb2_queue_setup(struct vb2_queue *vq,
				unsigned int *nbufs,
				unsigned int *num_planes, unsigned int sizes[],
				struct device *alloc_devs[])
{
	struct pxa_camera_dev *pcdev = vb2_get_drv_priv(vq);
	int size = pcdev->current_pix.sizeimage;

	dev_dbg(pcdev_to_dev(pcdev),
		 "%s(vq=%p nbufs=%d num_planes=%d size=%d)\n",
		__func__, vq, *nbufs, *num_planes, size);
	/*
	 * Called from VIDIOC_REQBUFS or in compatibility mode For YUV422P
	 * format, even if there are 3 planes Y, U and V, we reply there is only
	 * one plane, containing Y, U and V data, one after the other.
	 */
	if (*num_planes)
		return sizes[0] < size ? -EINVAL : 0;

	*num_planes = 1;
	switch (pcdev->channels) {
	case 1:
	case 3:
		sizes[0] = size;
		break;
	default:
		return -EINVAL;
	}

	if (!*nbufs)
		*nbufs = 1;

	return 0;
}

static int pxac_vb2_start_streaming(struct vb2_queue *vq, unsigned int count)
{
	struct pxa_camera_dev *pcdev = vb2_get_drv_priv(vq);

	dev_dbg(pcdev_to_dev(pcdev), "%s(count=%d) active=%p\n",
		__func__, count, pcdev->active);

	pcdev->buf_sequence = 0;
	if (!pcdev->active)
		pxa_camera_start_capture(pcdev);

	return 0;
}

static void pxac_vb2_stop_streaming(struct vb2_queue *vq)
{
	struct pxa_camera_dev *pcdev = vb2_get_drv_priv(vq);
	struct pxa_buffer *buf, *tmp;

	dev_dbg(pcdev_to_dev(pcdev), "%s active=%p\n",
		__func__, pcdev->active);
	pxa_camera_stop_capture(pcdev);

	list_for_each_entry_safe(buf, tmp, &pcdev->capture, queue)
		pxa_camera_wakeup(pcdev, buf, VB2_BUF_STATE_ERROR);
}

static struct vb2_ops pxac_vb2_ops = {
	.queue_setup		= pxac_vb2_queue_setup,
	.buf_init		= pxac_vb2_init,
	.buf_prepare		= pxac_vb2_prepare,
	.buf_queue		= pxac_vb2_queue,
	.buf_cleanup		= pxac_vb2_cleanup,
	.start_streaming	= pxac_vb2_start_streaming,
	.stop_streaming		= pxac_vb2_stop_streaming,
	.wait_prepare		= vb2_ops_wait_prepare,
	.wait_finish		= vb2_ops_wait_finish,
};

static int pxa_camera_init_videobuf2(struct pxa_camera_dev *pcdev)
{
	int ret;
	struct vb2_queue *vq = &pcdev->vb2_vq;

	memset(vq, 0, sizeof(*vq));
	vq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
	vq->io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
	vq->drv_priv = pcdev;
	vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
	vq->buf_struct_size = sizeof(struct pxa_buffer);
	vq->dev = pcdev->v4l2_dev.dev;

	vq->ops = &pxac_vb2_ops;
	vq->mem_ops = &vb2_dma_sg_memops;
	vq->lock = &pcdev->mlock;

	ret = vb2_queue_init(vq);
	dev_dbg(pcdev_to_dev(pcdev),
		 "vb2_queue_init(vq=%p): %d\n", vq, ret);

	return ret;
}

/*
 * Video ioctls section
 */
static int pxa_camera_set_bus_param(struct pxa_camera_dev *pcdev)
{
	struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,};
	u32 pixfmt = pcdev->current_fmt->host_fmt->fourcc;
	unsigned long bus_flags, common_flags;
	int ret;

	ret = test_platform_param(pcdev,
				  pcdev->current_fmt->host_fmt->bits_per_sample,
				  &bus_flags);
	if (ret < 0)
		return ret;

	ret = sensor_call(pcdev, video, g_mbus_config, &cfg);
	if (!ret) {
		common_flags = soc_mbus_config_compatible(&cfg,
							  bus_flags);
		if (!common_flags) {
			dev_warn(pcdev_to_dev(pcdev),
				 "Flags incompatible: camera 0x%x, host 0x%lx\n",
				 cfg.flags, bus_flags);
			return -EINVAL;
		}
	} else if (ret != -ENOIOCTLCMD) {
		return ret;
	} else {
		common_flags = bus_flags;
	}

	pcdev->channels = 1;

	/* Make choises, based on platform preferences */
	if ((common_flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH) &&
	    (common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)) {
		if (pcdev->platform_flags & PXA_CAMERA_HSP)
			common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_HIGH;
		else
			common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_LOW;
	}

	if ((common_flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH) &&
	    (common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)) {
		if (pcdev->platform_flags & PXA_CAMERA_VSP)
			common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_HIGH;
		else
			common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_LOW;
	}

	if ((common_flags & V4L2_MBUS_PCLK_SAMPLE_RISING) &&
	    (common_flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)) {
		if (pcdev->platform_flags & PXA_CAMERA_PCP)
			common_flags &= ~V4L2_MBUS_PCLK_SAMPLE_RISING;
		else
			common_flags &= ~V4L2_MBUS_PCLK_SAMPLE_FALLING;
	}

	cfg.flags = common_flags;
	ret = sensor_call(pcdev, video, s_mbus_config, &cfg);
	if (ret < 0 && ret != -ENOIOCTLCMD) {
		dev_dbg(pcdev_to_dev(pcdev),
			"camera s_mbus_config(0x%lx) returned %d\n",
			common_flags, ret);
		return ret;
	}

	pxa_camera_setup_cicr(pcdev, common_flags, pixfmt);

	return 0;
}

static int pxa_camera_try_bus_param(struct pxa_camera_dev *pcdev,
				    unsigned char buswidth)
{
	struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,};
	unsigned long bus_flags, common_flags;
	int ret = test_platform_param(pcdev, buswidth, &bus_flags);

	if (ret < 0)
		return ret;

	ret = sensor_call(pcdev, video, g_mbus_config, &cfg);
	if (!ret) {
		common_flags = soc_mbus_config_compatible(&cfg,
							  bus_flags);
		if (!common_flags) {
			dev_warn(pcdev_to_dev(pcdev),
				 "Flags incompatible: camera 0x%x, host 0x%lx\n",
				 cfg.flags, bus_flags);
			return -EINVAL;
		}
	} else if (ret == -ENOIOCTLCMD) {
		ret = 0;
	}

	return ret;
}

static const struct soc_mbus_pixelfmt pxa_camera_formats[] = {
	{
		.fourcc			= V4L2_PIX_FMT_YUV422P,
		.name			= "Planar YUV422 16 bit",
		.bits_per_sample	= 8,
		.packing		= SOC_MBUS_PACKING_2X8_PADHI,
		.order			= SOC_MBUS_ORDER_LE,
		.layout			= SOC_MBUS_LAYOUT_PLANAR_2Y_U_V,
	},
};

/* This will be corrected as we get more formats */
static bool pxa_camera_packing_supported(const struct soc_mbus_pixelfmt *fmt)
{
	return	fmt->packing == SOC_MBUS_PACKING_NONE ||
		(fmt->bits_per_sample == 8 &&
		 fmt->packing == SOC_MBUS_PACKING_2X8_PADHI) ||
		(fmt->bits_per_sample > 8 &&
		 fmt->packing == SOC_MBUS_PACKING_EXTEND16);
}

static int pxa_camera_get_formats(struct v4l2_device *v4l2_dev,
				  unsigned int idx,
				  struct soc_camera_format_xlate *xlate)
{
	struct pxa_camera_dev *pcdev = v4l2_dev_to_pcdev(v4l2_dev);
	int formats = 0, ret;
	struct v4l2_subdev_mbus_code_enum code = {
		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
		.index = idx,
	};
	const struct soc_mbus_pixelfmt *fmt;

	ret = sensor_call(pcdev, pad, enum_mbus_code, NULL, &code);
	if (ret < 0)
		/* No more formats */
		return 0;

	fmt = soc_mbus_get_fmtdesc(code.code);
	if (!fmt) {
		dev_err(pcdev_to_dev(pcdev),
			"Invalid format code #%u: %d\n", idx, code.code);
		return 0;
	}

	/* This also checks support for the requested bits-per-sample */
	ret = pxa_camera_try_bus_param(pcdev, fmt->bits_per_sample);
	if (ret < 0)
		return 0;

	switch (code.code) {
	case MEDIA_BUS_FMT_UYVY8_2X8:
		formats++;
		if (xlate) {
			xlate->host_fmt	= &pxa_camera_formats[0];
			xlate->code	= code.code;
			xlate++;
			dev_dbg(pcdev_to_dev(pcdev),
				"Providing format %s using code %d\n",
				pxa_camera_formats[0].name, code.code);
		}
	case MEDIA_BUS_FMT_VYUY8_2X8:
	case MEDIA_BUS_FMT_YUYV8_2X8:
	case MEDIA_BUS_FMT_YVYU8_2X8:
	case MEDIA_BUS_FMT_RGB565_2X8_LE:
	case MEDIA_BUS_FMT_RGB555_2X8_PADHI_LE:
		if (xlate)
			dev_dbg(pcdev_to_dev(pcdev),
				"Providing format %s packed\n",
				fmt->name);
		break;
	default:
		if (!pxa_camera_packing_supported(fmt))
			return 0;
		if (xlate)
			dev_dbg(pcdev_to_dev(pcdev),
				"Providing format %s in pass-through mode\n",
				fmt->name);
	}

	/* Generic pass-through */
	formats++;
	if (xlate) {
		xlate->host_fmt	= fmt;
		xlate->code	= code.code;
		xlate++;
	}

	return formats;
}

static int pxa_camera_build_formats(struct pxa_camera_dev *pcdev)
{
	struct soc_camera_format_xlate *xlate;

	xlate = soc_mbus_build_fmts_xlate(&pcdev->v4l2_dev, pcdev->sensor,
					  pxa_camera_get_formats);
	if (IS_ERR(xlate))
		return PTR_ERR(xlate);

	pcdev->user_formats = xlate;
	return 0;
}

static void pxa_camera_destroy_formats(struct pxa_camera_dev *pcdev)
{
	kfree(pcdev->user_formats);
}

static int pxa_camera_check_frame(u32 width, u32 height)
{
	/* limit to pxa hardware capabilities */
	return height < 32 || height > 2048 || width < 48 || width > 2048 ||
		(width & 0x01);
}

#ifdef CONFIG_VIDEO_ADV_DEBUG
static int pxac_vidioc_g_register(struct file *file, void *priv,
				  struct v4l2_dbg_register *reg)
{
	struct pxa_camera_dev *pcdev = video_drvdata(file);

	if (reg->reg > CIBR2)
		return -ERANGE;

	reg->val = __raw_readl(pcdev->base + reg->reg);
	reg->size = sizeof(__u32);
	return 0;
}

static int pxac_vidioc_s_register(struct file *file, void *priv,
				  const struct v4l2_dbg_register *reg)
{
	struct pxa_camera_dev *pcdev = video_drvdata(file);

	if (reg->reg > CIBR2)
		return -ERANGE;
	if (reg->size != sizeof(__u32))
		return -EINVAL;
	__raw_writel(reg->val, pcdev->base + reg->reg);
	return 0;
}
#endif

static int pxac_vidioc_enum_fmt_vid_cap(struct file *filp, void  *priv,
					struct v4l2_fmtdesc *f)
{
	struct pxa_camera_dev *pcdev = video_drvdata(filp);
	const struct soc_mbus_pixelfmt *format;
	unsigned int idx;

	for (idx = 0; pcdev->user_formats[idx].code; idx++);
	if (f->index >= idx)
		return -EINVAL;

	format = pcdev->user_formats[f->index].host_fmt;
	f->pixelformat = format->fourcc;
	return 0;
}

static int pxac_vidioc_g_fmt_vid_cap(struct file *filp, void *priv,
				    struct v4l2_format *f)
{
	struct pxa_camera_dev *pcdev = video_drvdata(filp);
	struct v4l2_pix_format *pix = &f->fmt.pix;

	pix->width		= pcdev->current_pix.width;
	pix->height		= pcdev->current_pix.height;
	pix->bytesperline	= pcdev->current_pix.bytesperline;
	pix->sizeimage		= pcdev->current_pix.sizeimage;
	pix->field		= pcdev->current_pix.field;
	pix->pixelformat	= pcdev->current_fmt->host_fmt->fourcc;
	pix->colorspace		= pcdev->current_pix.colorspace;
	dev_dbg(pcdev_to_dev(pcdev), "current_fmt->fourcc: 0x%08x\n",
		pcdev->current_fmt->host_fmt->fourcc);
	return 0;
}

static int pxac_vidioc_try_fmt_vid_cap(struct file *filp, void *priv,
				      struct v4l2_format *f)
{
	struct pxa_camera_dev *pcdev = video_drvdata(filp);
	const struct soc_camera_format_xlate *xlate;
	struct v4l2_pix_format *pix = &f->fmt.pix;
	struct v4l2_subdev_pad_config pad_cfg;
	struct v4l2_subdev_format format = {
		.which = V4L2_SUBDEV_FORMAT_TRY,
	};
	struct v4l2_mbus_framefmt *mf = &format.format;
	__u32 pixfmt = pix->pixelformat;
	int ret;

	xlate = soc_mbus_xlate_by_fourcc(pcdev->user_formats, pixfmt);
	if (!xlate) {
		dev_warn(pcdev_to_dev(pcdev), "Format %x not found\n", pixfmt);
		return -EINVAL;
	}

	/*
	 * Limit to pxa hardware capabilities.  YUV422P planar format requires
	 * images size to be a multiple of 16 bytes.  If not, zeros will be
	 * inserted between Y and U planes, and U and V planes, which violates
	 * the YUV422P standard.
	 */
	v4l_bound_align_image(&pix->width, 48, 2048, 1,
			      &pix->height, 32, 2048, 0,
			      pixfmt == V4L2_PIX_FMT_YUV422P ? 4 : 0);

	v4l2_fill_mbus_format(mf, pix, xlate->code);
	ret = sensor_call(pcdev, pad, set_fmt, &pad_cfg, &format);
	if (ret < 0)
		return ret;

	v4l2_fill_pix_format(pix, mf);

	/* Only progressive video supported so far */
	switch (mf->field) {
	case V4L2_FIELD_ANY:
	case V4L2_FIELD_NONE:
		pix->field = V4L2_FIELD_NONE;
		break;
	default:
		/* TODO: support interlaced at least in pass-through mode */
		dev_err(pcdev_to_dev(pcdev), "Field type %d unsupported.\n",
			mf->field);
		return -EINVAL;
	}

	ret = soc_mbus_bytes_per_line(pix->width, xlate->host_fmt);
	if (ret < 0)
		return ret;

	pix->bytesperline = ret;
	ret = soc_mbus_image_size(xlate->host_fmt, pix->bytesperline,
				  pix->height);
	if (ret < 0)
		return ret;

	pix->sizeimage = ret;
	return 0;
}

static int pxac_vidioc_s_fmt_vid_cap(struct file *filp, void *priv,
				    struct v4l2_format *f)
{
	struct pxa_camera_dev *pcdev = video_drvdata(filp);
	const struct soc_camera_format_xlate *xlate;
	struct v4l2_pix_format *pix = &f->fmt.pix;
	struct v4l2_subdev_format format = {
		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
	};
	unsigned long flags;
	int ret, is_busy;

	dev_dbg(pcdev_to_dev(pcdev),
		"s_fmt_vid_cap(pix=%dx%d:%x)\n",
		pix->width, pix->height, pix->pixelformat);

	spin_lock_irqsave(&pcdev->lock, flags);
	is_busy = pcdev->active || vb2_is_busy(&pcdev->vb2_vq);
	spin_unlock_irqrestore(&pcdev->lock, flags);

	if (is_busy)
		return -EBUSY;

	ret = pxac_vidioc_try_fmt_vid_cap(filp, priv, f);
	if (ret)
		return ret;

	xlate = soc_mbus_xlate_by_fourcc(pcdev->user_formats,
					 pix->pixelformat);
	v4l2_fill_mbus_format(&format.format, pix, xlate->code);
	ret = sensor_call(pcdev, pad, set_fmt, NULL, &format);
	if (ret < 0) {
		dev_warn(pcdev_to_dev(pcdev),
			 "Failed to configure for format %x\n",
			 pix->pixelformat);
	} else if (pxa_camera_check_frame(pix->width, pix->height)) {
		dev_warn(pcdev_to_dev(pcdev),
			 "Camera driver produced an unsupported frame %dx%d\n",
			 pix->width, pix->height);
		return -EINVAL;
	}

	pcdev->current_fmt = xlate;
	pcdev->current_pix = *pix;

	ret = pxa_camera_set_bus_param(pcdev);
	return ret;
}

static int pxac_vidioc_querycap(struct file *file, void *priv,
				struct v4l2_capability *cap)
{
	strlcpy(cap->bus_info, "platform:pxa-camera", sizeof(cap->bus_info));
	strlcpy(cap->driver, PXA_CAM_DRV_NAME, sizeof(cap->driver));
	strlcpy(cap->card, pxa_cam_driver_description, sizeof(cap->card));
	cap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
	cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;

	return 0;
}

static int pxac_vidioc_enum_input(struct file *file, void *priv,
				  struct v4l2_input *i)
{
	if (i->index > 0)
		return -EINVAL;

	i->type = V4L2_INPUT_TYPE_CAMERA;
	strlcpy(i->name, "Camera", sizeof(i->name));

	return 0;
}

static int pxac_vidioc_g_input(struct file *file, void *priv, unsigned int *i)
{
	*i = 0;

	return 0;
}

static int pxac_vidioc_s_input(struct file *file, void *priv, unsigned int i)
{
	if (i > 0)
		return -EINVAL;

	return 0;
}

static int pxac_fops_camera_open(struct file *filp)
{
	struct pxa_camera_dev *pcdev = video_drvdata(filp);
	int ret;

	mutex_lock(&pcdev->mlock);
	ret = v4l2_fh_open(filp);
	if (ret < 0)
		goto out;

	ret = sensor_call(pcdev, core, s_power, 1);
	if (ret)
		v4l2_fh_release(filp);
out:
	mutex_unlock(&pcdev->mlock);
	return ret;
}

static int pxac_fops_camera_release(struct file *filp)
{
	struct pxa_camera_dev *pcdev = video_drvdata(filp);
	int ret;

	ret = vb2_fop_release(filp);
	if (ret < 0)
		return ret;

	mutex_lock(&pcdev->mlock);
	ret = sensor_call(pcdev, core, s_power, 0);
	mutex_unlock(&pcdev->mlock);

	return ret;
}

static const struct v4l2_file_operations pxa_camera_fops = {
	.owner		= THIS_MODULE,
	.open		= pxac_fops_camera_open,
	.release	= pxac_fops_camera_release,
	.read		= vb2_fop_read,
	.poll		= vb2_fop_poll,
	.mmap		= vb2_fop_mmap,
	.unlocked_ioctl = video_ioctl2,
};

static const struct v4l2_ioctl_ops pxa_camera_ioctl_ops = {
	.vidioc_querycap		= pxac_vidioc_querycap,

	.vidioc_enum_input		= pxac_vidioc_enum_input,
	.vidioc_g_input			= pxac_vidioc_g_input,
	.vidioc_s_input			= pxac_vidioc_s_input,

	.vidioc_enum_fmt_vid_cap	= pxac_vidioc_enum_fmt_vid_cap,
	.vidioc_g_fmt_vid_cap		= pxac_vidioc_g_fmt_vid_cap,
	.vidioc_s_fmt_vid_cap		= pxac_vidioc_s_fmt_vid_cap,
	.vidioc_try_fmt_vid_cap		= pxac_vidioc_try_fmt_vid_cap,

	.vidioc_reqbufs			= vb2_ioctl_reqbufs,
	.vidioc_create_bufs		= vb2_ioctl_create_bufs,
	.vidioc_querybuf		= vb2_ioctl_querybuf,
	.vidioc_qbuf			= vb2_ioctl_qbuf,
	.vidioc_dqbuf			= vb2_ioctl_dqbuf,
	.vidioc_expbuf			= vb2_ioctl_expbuf,
	.vidioc_streamon		= vb2_ioctl_streamon,
	.vidioc_streamoff		= vb2_ioctl_streamoff,
#ifdef CONFIG_VIDEO_ADV_DEBUG
	.vidioc_g_register		= pxac_vidioc_g_register,
	.vidioc_s_register		= pxac_vidioc_s_register,
#endif
};

static struct v4l2_clk_ops pxa_camera_mclk_ops = {
};

static const struct video_device pxa_camera_videodev_template = {
	.name = "pxa-camera",
	.minor = -1,
	.fops = &pxa_camera_fops,
	.ioctl_ops = &pxa_camera_ioctl_ops,
	.release = video_device_release_empty,
	.device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING,
};

static int pxa_camera_sensor_bound(struct v4l2_async_notifier *notifier,
		     struct v4l2_subdev *subdev,
		     struct v4l2_async_subdev *asd)
{
	int err;
	struct v4l2_device *v4l2_dev = notifier->v4l2_dev;
	struct pxa_camera_dev *pcdev = v4l2_dev_to_pcdev(v4l2_dev);
	struct video_device *vdev = &pcdev->vdev;
	struct v4l2_pix_format *pix = &pcdev->current_pix;
	struct v4l2_subdev_format format = {
		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
	};
	struct v4l2_mbus_framefmt *mf = &format.format;

	dev_info(pcdev_to_dev(pcdev), "%s(): trying to bind a device\n",
		 __func__);
	mutex_lock(&pcdev->mlock);
	*vdev = pxa_camera_videodev_template;
	vdev->v4l2_dev = v4l2_dev;
	vdev->lock = &pcdev->mlock;
	pcdev->sensor = subdev;
	pcdev->vdev.queue = &pcdev->vb2_vq;
	pcdev->vdev.v4l2_dev = &pcdev->v4l2_dev;
	pcdev->vdev.ctrl_handler = subdev->ctrl_handler;
	video_set_drvdata(&pcdev->vdev, pcdev);

	err = pxa_camera_build_formats(pcdev);
	if (err) {
		dev_err(pcdev_to_dev(pcdev), "building formats failed: %d\n",
			err);
		goto out;
	}

	pcdev->current_fmt = pcdev->user_formats;
	pix->field = V4L2_FIELD_NONE;
	pix->width = DEFAULT_WIDTH;
	pix->height = DEFAULT_HEIGHT;
	pix->bytesperline =
		soc_mbus_bytes_per_line(pix->width,
					pcdev->current_fmt->host_fmt);
	pix->sizeimage =
		soc_mbus_image_size(pcdev->current_fmt->host_fmt,
				    pix->bytesperline, pix->height);
	pix->pixelformat = pcdev->current_fmt->host_fmt->fourcc;
	v4l2_fill_mbus_format(mf, pix, pcdev->current_fmt->code);
	err = sensor_call(pcdev, pad, set_fmt, NULL, &format);
	if (err)
		goto out;

	v4l2_fill_pix_format(pix, mf);
	pr_info("%s(): colorspace=0x%x pixfmt=0x%x\n",
		__func__, pix->colorspace, pix->pixelformat);

	err = pxa_camera_init_videobuf2(pcdev);
	if (err)
		goto out;

	err = video_register_device(&pcdev->vdev, VFL_TYPE_GRABBER, -1);
	if (err) {
		v4l2_err(v4l2_dev, "register video device failed: %d\n", err);
		pcdev->sensor = NULL;
	} else {
		dev_info(pcdev_to_dev(pcdev),
			 "PXA Camera driver attached to camera %s\n",
			 subdev->name);
	}
out:
	mutex_unlock(&pcdev->mlock);
	return err;
}

static void pxa_camera_sensor_unbind(struct v4l2_async_notifier *notifier,
		     struct v4l2_subdev *subdev,
		     struct v4l2_async_subdev *asd)
{
	struct pxa_camera_dev *pcdev = v4l2_dev_to_pcdev(notifier->v4l2_dev);

	mutex_lock(&pcdev->mlock);
	dev_info(pcdev_to_dev(pcdev),
		 "PXA Camera driver detached from camera %s\n",
		 subdev->name);

	/* disable capture, disable interrupts */
	__raw_writel(0x3ff, pcdev->base + CICR0);

	/* Stop DMA engine */
	pxa_dma_stop_channels(pcdev);

	pxa_camera_destroy_formats(pcdev);
	video_unregister_device(&pcdev->vdev);
	pcdev->sensor = NULL;

	mutex_unlock(&pcdev->mlock);
}

/*
 * Driver probe, remove, suspend and resume operations
 */
static int pxa_camera_suspend(struct device *dev)
{
	struct pxa_camera_dev *pcdev = dev_get_drvdata(dev);
	int i = 0, ret = 0;

	pcdev->save_cicr[i++] = __raw_readl(pcdev->base + CICR0);
	pcdev->save_cicr[i++] = __raw_readl(pcdev->base + CICR1);
	pcdev->save_cicr[i++] = __raw_readl(pcdev->base + CICR2);
	pcdev->save_cicr[i++] = __raw_readl(pcdev->base + CICR3);
	pcdev->save_cicr[i++] = __raw_readl(pcdev->base + CICR4);

	if (pcdev->sensor) {
		ret = sensor_call(pcdev, core, s_power, 0);
		if (ret == -ENOIOCTLCMD)
			ret = 0;
	}

	return ret;
}

static int pxa_camera_resume(struct device *dev)
{
	struct pxa_camera_dev *pcdev = dev_get_drvdata(dev);
	int i = 0, ret = 0;

	__raw_writel(pcdev->save_cicr[i++] & ~CICR0_ENB, pcdev->base + CICR0);
	__raw_writel(pcdev->save_cicr[i++], pcdev->base + CICR1);
	__raw_writel(pcdev->save_cicr[i++], pcdev->base + CICR2);
	__raw_writel(pcdev->save_cicr[i++], pcdev->base + CICR3);
	__raw_writel(pcdev->save_cicr[i++], pcdev->base + CICR4);

	if (pcdev->sensor) {
		ret = sensor_call(pcdev, core, s_power, 1);
		if (ret == -ENOIOCTLCMD)
			ret = 0;
	}

	/* Restart frame capture if active buffer exists */
	if (!ret && pcdev->active)
		pxa_camera_start_capture(pcdev);

	return ret;
}

static int pxa_camera_pdata_from_dt(struct device *dev,
				    struct pxa_camera_dev *pcdev,
				    struct v4l2_async_subdev *asd)
{
	u32 mclk_rate;
	struct device_node *remote, *np = dev->of_node;
	struct v4l2_of_endpoint ep;
	int err = of_property_read_u32(np, "clock-frequency",
				       &mclk_rate);
	if (!err) {
		pcdev->platform_flags |= PXA_CAMERA_MCLK_EN;
		pcdev->mclk = mclk_rate;
	}

	np = of_graph_get_next_endpoint(np, NULL);
	if (!np) {
		dev_err(dev, "could not find endpoint\n");
		return -EINVAL;
	}

	err = v4l2_of_parse_endpoint(np, &ep);
	if (err) {
		dev_err(dev, "could not parse endpoint\n");
		goto out;
	}

	switch (ep.bus.parallel.bus_width) {
	case 4:
		pcdev->platform_flags |= PXA_CAMERA_DATAWIDTH_4;
		break;
	case 5:
		pcdev->platform_flags |= PXA_CAMERA_DATAWIDTH_5;
		break;
	case 8:
		pcdev->platform_flags |= PXA_CAMERA_DATAWIDTH_8;
		break;
	case 9:
		pcdev->platform_flags |= PXA_CAMERA_DATAWIDTH_9;
		break;
	case 10:
		pcdev->platform_flags |= PXA_CAMERA_DATAWIDTH_10;
		break;
	default:
		break;
	}

	if (ep.bus.parallel.flags & V4L2_MBUS_MASTER)
		pcdev->platform_flags |= PXA_CAMERA_MASTER;
	if (ep.bus.parallel.flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH)
		pcdev->platform_flags |= PXA_CAMERA_HSP;
	if (ep.bus.parallel.flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH)
		pcdev->platform_flags |= PXA_CAMERA_VSP;
	if (ep.bus.parallel.flags & V4L2_MBUS_PCLK_SAMPLE_RISING)
		pcdev->platform_flags |= PXA_CAMERA_PCLK_EN | PXA_CAMERA_PCP;
	if (ep.bus.parallel.flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)
		pcdev->platform_flags |= PXA_CAMERA_PCLK_EN;

	asd->match_type = V4L2_ASYNC_MATCH_OF;
	remote = of_graph_get_remote_port(np);
	if (remote) {
		asd->match.of.node = remote;
		of_node_put(remote);
	} else {
		dev_notice(dev, "no remote for %s\n", of_node_full_name(np));
	}

out:
	of_node_put(np);

	return err;
}

static int pxa_camera_probe(struct platform_device *pdev)
{
	struct pxa_camera_dev *pcdev;
	struct resource *res;
	void __iomem *base;
	struct dma_slave_config config = {
		.src_addr_width = 0,
		.src_maxburst = 8,
		.direction = DMA_DEV_TO_MEM,
	};
	dma_cap_mask_t mask;
	struct pxad_param params;
	char clk_name[V4L2_CLK_NAME_SIZE];
	int irq;
	int err = 0, i;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	irq = platform_get_irq(pdev, 0);
	if (!res || irq < 0)
		return -ENODEV;

	pcdev = devm_kzalloc(&pdev->dev, sizeof(*pcdev), GFP_KERNEL);
	if (!pcdev) {
		dev_err(&pdev->dev, "Could not allocate pcdev\n");
		return -ENOMEM;
	}

	pcdev->clk = devm_clk_get(&pdev->dev, NULL);
	if (IS_ERR(pcdev->clk))
		return PTR_ERR(pcdev->clk);

	pcdev->res = res;

	pcdev->pdata = pdev->dev.platform_data;
	if (&pdev->dev.of_node && !pcdev->pdata) {
		err = pxa_camera_pdata_from_dt(&pdev->dev, pcdev, &pcdev->asd);
	} else {
		pcdev->platform_flags = pcdev->pdata->flags;
		pcdev->mclk = pcdev->pdata->mclk_10khz * 10000;
		pcdev->asd.match_type = V4L2_ASYNC_MATCH_I2C;
		pcdev->asd.match.i2c.adapter_id =
			pcdev->pdata->sensor_i2c_adapter_id;
		pcdev->asd.match.i2c.address = pcdev->pdata->sensor_i2c_address;
	}
	if (err < 0)
		return err;

	if (!(pcdev->platform_flags & (PXA_CAMERA_DATAWIDTH_8 |
			PXA_CAMERA_DATAWIDTH_9 | PXA_CAMERA_DATAWIDTH_10))) {
		/*
		 * Platform hasn't set available data widths. This is bad.
		 * Warn and use a default.
		 */
		dev_warn(&pdev->dev, "WARNING! Platform hasn't set available "
			 "data widths, using default 10 bit\n");
		pcdev->platform_flags |= PXA_CAMERA_DATAWIDTH_10;
	}
	if (pcdev->platform_flags & PXA_CAMERA_DATAWIDTH_8)
		pcdev->width_flags = 1 << 7;
	if (pcdev->platform_flags & PXA_CAMERA_DATAWIDTH_9)
		pcdev->width_flags |= 1 << 8;
	if (pcdev->platform_flags & PXA_CAMERA_DATAWIDTH_10)
		pcdev->width_flags |= 1 << 9;
	if (!pcdev->mclk) {
		dev_warn(&pdev->dev,
			 "mclk == 0! Please, fix your platform data. "
			 "Using default 20MHz\n");
		pcdev->mclk = 20000000;
	}

	pcdev->mclk_divisor = mclk_get_divisor(pdev, pcdev);

	INIT_LIST_HEAD(&pcdev->capture);
	spin_lock_init(&pcdev->lock);
	mutex_init(&pcdev->mlock);

	/*
	 * Request the regions.
	 */
	base = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(base))
		return PTR_ERR(base);

	pcdev->irq = irq;
	pcdev->base = base;

	/* request dma */
	dma_cap_zero(mask);
	dma_cap_set(DMA_SLAVE, mask);
	dma_cap_set(DMA_PRIVATE, mask);

	params.prio = 0;
	params.drcmr = 68;
	pcdev->dma_chans[0] =
		dma_request_slave_channel_compat(mask, pxad_filter_fn,
						 &params, &pdev->dev, "CI_Y");
	if (!pcdev->dma_chans[0]) {
		dev_err(&pdev->dev, "Can't request DMA for Y\n");
		return -ENODEV;
	}

	params.drcmr = 69;
	pcdev->dma_chans[1] =
		dma_request_slave_channel_compat(mask, pxad_filter_fn,
						 &params, &pdev->dev, "CI_U");
	if (!pcdev->dma_chans[1]) {
		dev_err(&pdev->dev, "Can't request DMA for Y\n");
		goto exit_free_dma_y;
	}

	params.drcmr = 70;
	pcdev->dma_chans[2] =
		dma_request_slave_channel_compat(mask, pxad_filter_fn,
						 &params, &pdev->dev, "CI_V");
	if (!pcdev->dma_chans[2]) {
		dev_err(&pdev->dev, "Can't request DMA for V\n");
		goto exit_free_dma_u;
	}

	for (i = 0; i < 3; i++) {
		config.src_addr = pcdev->res->start + CIBR0 + i * 8;
		err = dmaengine_slave_config(pcdev->dma_chans[i], &config);
		if (err < 0) {
			dev_err(&pdev->dev, "dma slave config failed: %d\n",
				err);
			goto exit_free_dma;
		}
	}

	/* request irq */
	err = devm_request_irq(&pdev->dev, pcdev->irq, pxa_camera_irq, 0,
			       PXA_CAM_DRV_NAME, pcdev);
	if (err) {
		dev_err(&pdev->dev, "Camera interrupt register failed\n");
		goto exit_free_dma;
	}

	tasklet_init(&pcdev->task_eof, pxa_camera_eof, (unsigned long)pcdev);

	pxa_camera_activate(pcdev);

	dev_set_drvdata(&pdev->dev, pcdev);
	err = v4l2_device_register(&pdev->dev, &pcdev->v4l2_dev);
	if (err)
		goto exit_free_dma;

	pcdev->asds[0] = &pcdev->asd;
	pcdev->notifier.subdevs = pcdev->asds;
	pcdev->notifier.num_subdevs = 1;
	pcdev->notifier.bound = pxa_camera_sensor_bound;
	pcdev->notifier.unbind = pxa_camera_sensor_unbind;

	if (!of_have_populated_dt())
		pcdev->asd.match_type = V4L2_ASYNC_MATCH_I2C;

	err = pxa_camera_init_videobuf2(pcdev);
	if (err)
		goto exit_free_v4l2dev;

	if (pcdev->mclk) {
		v4l2_clk_name_i2c(clk_name, sizeof(clk_name),
				  pcdev->asd.match.i2c.adapter_id,
				  pcdev->asd.match.i2c.address);

		pcdev->mclk_clk = v4l2_clk_register(&pxa_camera_mclk_ops,
						    clk_name, NULL);
		if (IS_ERR(pcdev->mclk_clk))
			return PTR_ERR(pcdev->mclk_clk);
	}

	err = v4l2_async_notifier_register(&pcdev->v4l2_dev, &pcdev->notifier);
	if (err)
		goto exit_free_clk;

	return 0;
exit_free_clk:
	v4l2_clk_unregister(pcdev->mclk_clk);
exit_free_v4l2dev:
	v4l2_device_unregister(&pcdev->v4l2_dev);
exit_free_dma:
	dma_release_channel(pcdev->dma_chans[2]);
exit_free_dma_u:
	dma_release_channel(pcdev->dma_chans[1]);
exit_free_dma_y:
	dma_release_channel(pcdev->dma_chans[0]);
	return err;
}

static int pxa_camera_remove(struct platform_device *pdev)
{
	struct pxa_camera_dev *pcdev = dev_get_drvdata(&pdev->dev);

	pxa_camera_deactivate(pcdev);
	dma_release_channel(pcdev->dma_chans[0]);
	dma_release_channel(pcdev->dma_chans[1]);
	dma_release_channel(pcdev->dma_chans[2]);

	v4l2_clk_unregister(pcdev->mclk_clk);
	v4l2_device_unregister(&pcdev->v4l2_dev);

	dev_info(&pdev->dev, "PXA Camera driver unloaded\n");

	return 0;
}

static const struct dev_pm_ops pxa_camera_pm = {
	.suspend	= pxa_camera_suspend,
	.resume		= pxa_camera_resume,
};

static const struct of_device_id pxa_camera_of_match[] = {
	{ .compatible = "marvell,pxa270-qci", },
	{},
};
MODULE_DEVICE_TABLE(of, pxa_camera_of_match);

static struct platform_driver pxa_camera_driver = {
	.driver		= {
		.name	= PXA_CAM_DRV_NAME,
		.pm	= &pxa_camera_pm,
		.of_match_table = of_match_ptr(pxa_camera_of_match),
	},
	.probe		= pxa_camera_probe,
	.remove		= pxa_camera_remove,
};

module_platform_driver(pxa_camera_driver);

MODULE_DESCRIPTION("PXA27x SoC Camera Host driver");
MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
MODULE_LICENSE("GPL");
MODULE_VERSION(PXA_CAM_VERSION);
MODULE_ALIAS("platform:" PXA_CAM_DRV_NAME);