text: /*
   * V4L2 Driver for SuperH Mobile CEU interface
   *
   * Copyright (C) 2008 Magnus Damm
   *
   * Based on V4L2 Driver for PXA camera host - "pxa_camera.c",
   *
   * Copyright (C) 2006, Sascha Hauer, Pengutronix
   * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
   *
   * 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/dma-mapping.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/time.h>
  #include <linux/version.h>
  #include <linux/slab.h>
  #include <linux/device.h>
  #include <linux/platform_device.h>
  #include <linux/videodev2.h>
  #include <linux/pm_runtime.h>
  #include <linux/sched.h>
  
  #include <media/v4l2-common.h>
  #include <media/v4l2-dev.h>
  #include <media/soc_camera.h>
  #include <media/sh_mobile_ceu.h>
  #include <media/videobuf-dma-contig.h>
  #include <media/v4l2-mediabus.h>
  #include <media/soc_mediabus.h>
  
  /* register offsets for sh7722 / sh7723 */
  
  #define CAPSR  0x00 /* Capture start register */
  #define CAPCR  0x04 /* Capture control register */
  #define CAMCR  0x08 /* Capture interface control register */
  #define CMCYR  0x0c /* Capture interface cycle  register */
  #define CAMOR  0x10 /* Capture interface offset register */
  #define CAPWR  0x14 /* Capture interface width register */
  #define CAIFR  0x18 /* Capture interface input format register */
  #define CSTCR  0x20 /* Camera strobe control register (<= sh7722) */
  #define CSECR  0x24 /* Camera strobe emission count register (<= sh7722) */
  #define CRCNTR 0x28 /* CEU register control register */
  #define CRCMPR 0x2c /* CEU register forcible control register */
  #define CFLCR  0x30 /* Capture filter control register */
  #define CFSZR  0x34 /* Capture filter size clip register */
  #define CDWDR  0x38 /* Capture destination width register */
  #define CDAYR  0x3c /* Capture data address Y register */
  #define CDACR  0x40 /* Capture data address C register */
  #define CDBYR  0x44 /* Capture data bottom-field address Y register */
  #define CDBCR  0x48 /* Capture data bottom-field address C register */
  #define CBDSR  0x4c /* Capture bundle destination size register */
  #define CFWCR  0x5c /* Firewall operation control register */
  #define CLFCR  0x60 /* Capture low-pass filter control register */
  #define CDOCR  0x64 /* Capture data output control register */
  #define CDDCR  0x68 /* Capture data complexity level register */
  #define CDDAR  0x6c /* Capture data complexity level address register */
  #define CEIER  0x70 /* Capture event interrupt enable register */
  #define CETCR  0x74 /* Capture event flag clear register */
  #define CSTSR  0x7c /* Capture status register */
  #define CSRTR  0x80 /* Capture software reset register */
  #define CDSSR  0x84 /* Capture data size register */
  #define CDAYR2 0x90 /* Capture data address Y register 2 */
  #define CDACR2 0x94 /* Capture data address C register 2 */
  #define CDBYR2 0x98 /* Capture data bottom-field address Y register 2 */
  #define CDBCR2 0x9c /* Capture data bottom-field address C register 2 */
  
  #undef DEBUG_GEOMETRY
  #ifdef DEBUG_GEOMETRY
  #define dev_geo	dev_info
  #else
  #define dev_geo	dev_dbg
  #endif
  
  /* per video frame buffer */
  struct sh_mobile_ceu_buffer {
  	struct videobuf_buffer vb; /* v4l buffer must be first */
  	enum v4l2_mbus_pixelcode code;
  };
  
  struct sh_mobile_ceu_dev {
  	struct soc_camera_host ici;
  	struct soc_camera_device *icd;
  
  	unsigned int irq;
  	void __iomem *base;
  	unsigned long video_limit;
  
  	/* lock used to protect videobuf */
  	spinlock_t lock;
  	struct list_head capture;
  	struct videobuf_buffer *active;
  
  	struct sh_mobile_ceu_info *pdata;
  
  	u32 cflcr;
  
  	enum v4l2_field field;
  
  	unsigned int image_mode:1;
  	unsigned int is_16bit:1;
  };
  
  struct sh_mobile_ceu_cam {
  	/* CEU offsets within scaled by the CEU camera output */
  	unsigned int ceu_left;
  	unsigned int ceu_top;
  	/* Client output, as seen by the CEU */
  	unsigned int width;
  	unsigned int height;
  	/*
  	 * User window from S_CROP / G_CROP, produced by client cropping and
  	 * scaling, CEU scaling and CEU cropping, mapped back onto the client
  	 * input window
  	 */
  	struct v4l2_rect subrect;
  	/* Camera cropping rectangle */
  	struct v4l2_rect rect;
  	const struct soc_mbus_pixelfmt *extra_fmt;
  	enum v4l2_mbus_pixelcode code;
  };
  
  static unsigned long make_bus_param(struct sh_mobile_ceu_dev *pcdev)
  {
  	unsigned long flags;
  
  	flags = SOCAM_MASTER |
  		SOCAM_PCLK_SAMPLE_RISING |
  		SOCAM_HSYNC_ACTIVE_HIGH |
  		SOCAM_HSYNC_ACTIVE_LOW |
  		SOCAM_VSYNC_ACTIVE_HIGH |
  		SOCAM_VSYNC_ACTIVE_LOW |
  		SOCAM_DATA_ACTIVE_HIGH;
  
  	if (pcdev->pdata->flags & SH_CEU_FLAG_USE_8BIT_BUS)
  		flags |= SOCAM_DATAWIDTH_8;
  
  	if (pcdev->pdata->flags & SH_CEU_FLAG_USE_16BIT_BUS)
  		flags |= SOCAM_DATAWIDTH_16;
  
  	if (flags & SOCAM_DATAWIDTH_MASK)
  		return flags;
  
  	return 0;
  }
  
  static void ceu_write(struct sh_mobile_ceu_dev *priv,
  		      unsigned long reg_offs, u32 data)
  {
  	iowrite32(data, priv->base + reg_offs);
  }
  
  static u32 ceu_read(struct sh_mobile_ceu_dev *priv, unsigned long reg_offs)
  {
  	return ioread32(priv->base + reg_offs);
  }
  
  static int sh_mobile_ceu_soft_reset(struct sh_mobile_ceu_dev *pcdev)
  {
  	int i, success = 0;
  	struct soc_camera_device *icd = pcdev->icd;
  
  	ceu_write(pcdev, CAPSR, 1 << 16); /* reset */
  
  	/* wait CSTSR.CPTON bit */
  	for (i = 0; i < 1000; i++) {
  		if (!(ceu_read(pcdev, CSTSR) & 1)) {
  			success++;
  			break;
  		}
  		udelay(1);
  	}
  
  	/* wait CAPSR.CPKIL bit */
  	for (i = 0; i < 1000; i++) {
  		if (!(ceu_read(pcdev, CAPSR) & (1 << 16))) {
  			success++;
  			break;
  		}
  		udelay(1);
  	}
  
  
  	if (2 != success) {
  		dev_warn(&icd->dev, "soft reset time out\n");
  		return -EIO;
  	}
  
  	return 0;
  }
  
  /*
   *  Videobuf operations
   */
  static int sh_mobile_ceu_videobuf_setup(struct videobuf_queue *vq,
  					unsigned int *count,
  					unsigned int *size)
  {
  	struct soc_camera_device *icd = vq->priv_data;
  	struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
  	struct sh_mobile_ceu_dev *pcdev = ici->priv;
  	int bytes_per_line = soc_mbus_bytes_per_line(icd->user_width,
  						icd->current_fmt->host_fmt);
  
  	if (bytes_per_line < 0)
  		return bytes_per_line;
  
  	*size = bytes_per_line * icd->user_height;
  
  	if (0 == *count)
  		*count = 2;
  
  	if (pcdev->video_limit) {
  		if (PAGE_ALIGN(*size) * *count > pcdev->video_limit)
  			*count = pcdev->video_limit / PAGE_ALIGN(*size);
  	}
  
  	dev_dbg(icd->dev.parent, "count=%d, size=%d\n", *count, *size);
  
  	return 0;
  }
  
  static void free_buffer(struct videobuf_queue *vq,
  			struct sh_mobile_ceu_buffer *buf)
  {
  	struct soc_camera_device *icd = vq->priv_data;
  	struct device *dev = icd->dev.parent;
  
  	dev_dbg(dev, "%s (vb=0x%p) 0x%08lx %zd\n", __func__,
  		&buf->vb, buf->vb.baddr, buf->vb.bsize);
  
  	if (in_interrupt())
  		BUG();
  
  	videobuf_waiton(&buf->vb, 0, 0);
  	videobuf_dma_contig_free(vq, &buf->vb);
  	dev_dbg(dev, "%s freed\n", __func__);
  	buf->vb.state = VIDEOBUF_NEEDS_INIT;
  }
  
  #define CEU_CETCR_MAGIC 0x0317f313 /* acknowledge magical interrupt sources */
  #define CEU_CETCR_IGRW (1 << 4) /* prohibited register access interrupt bit */
  #define CEU_CEIER_CPEIE (1 << 0) /* one-frame capture end interrupt */
  #define CEU_CEIER_VBP   (1 << 20) /* vbp error */
  #define CEU_CAPCR_CTNCP (1 << 16) /* continuous capture mode (if set) */
  #define CEU_CEIER_MASK (CEU_CEIER_CPEIE | CEU_CEIER_VBP)
  
  
  /*
   * return value doesn't reflex the success/failure to queue the new buffer,
   * but rather the status of the previous buffer.
   */
  static int sh_mobile_ceu_capture(struct sh_mobile_ceu_dev *pcdev)
  {
  	struct soc_camera_device *icd = pcdev->icd;
  	dma_addr_t phys_addr_top, phys_addr_bottom;
  	unsigned long top1, top2;
  	unsigned long bottom1, bottom2;
  	u32 status;
  	int ret = 0;
  
  	/*
  	 * The hardware is _very_ picky about this sequence. Especially
  	 * the CEU_CETCR_MAGIC value. It seems like we need to acknowledge
  	 * several not-so-well documented interrupt sources in CETCR.
  	 */
  	ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) & ~CEU_CEIER_MASK);
  	status = ceu_read(pcdev, CETCR);
  	ceu_write(pcdev, CETCR, ~status & CEU_CETCR_MAGIC);
  	ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) | CEU_CEIER_MASK);
  	ceu_write(pcdev, CAPCR, ceu_read(pcdev, CAPCR) & ~CEU_CAPCR_CTNCP);
  	ceu_write(pcdev, CETCR, CEU_CETCR_MAGIC ^ CEU_CETCR_IGRW);
  
  	/*
  	 * When a VBP interrupt occurs, a capture end interrupt does not occur
  	 * and the image of that frame is not captured correctly. So, soft reset
  	 * is needed here.
  	 */
  	if (status & CEU_CEIER_VBP) {
  		sh_mobile_ceu_soft_reset(pcdev);
  		ret = -EIO;
  	}
  
  	if (!pcdev->active)
  		return ret;
  
  	if (V4L2_FIELD_INTERLACED_BT == pcdev->field) {
  		top1	= CDBYR;
  		top2	= CDBCR;
  		bottom1	= CDAYR;
  		bottom2	= CDACR;
  	} else {
  		top1	= CDAYR;
  		top2	= CDACR;
  		bottom1	= CDBYR;
  		bottom2	= CDBCR;
  	}
  
  	phys_addr_top = videobuf_to_dma_contig(pcdev->active);
  	ceu_write(pcdev, top1, phys_addr_top);
  	if (V4L2_FIELD_NONE != pcdev->field) {
  		phys_addr_bottom = phys_addr_top + icd->user_width;
  		ceu_write(pcdev, bottom1, phys_addr_bottom);
  	}
  
  	switch (icd->current_fmt->host_fmt->fourcc) {
  	case V4L2_PIX_FMT_NV12:
  	case V4L2_PIX_FMT_NV21:
  	case V4L2_PIX_FMT_NV16:
  	case V4L2_PIX_FMT_NV61:
  		phys_addr_top += icd->user_width *
  			icd->user_height;
  		ceu_write(pcdev, top2, phys_addr_top);
  		if (V4L2_FIELD_NONE != pcdev->field) {
  			phys_addr_bottom = phys_addr_top + icd->user_width;
  			ceu_write(pcdev, bottom2, phys_addr_bottom);
  		}
  	}
  
  	pcdev->active->state = VIDEOBUF_ACTIVE;
  	ceu_write(pcdev, CAPSR, 0x1); /* start capture */
  
  	return ret;
  }
  
  static int sh_mobile_ceu_videobuf_prepare(struct videobuf_queue *vq,
  					  struct videobuf_buffer *vb,
  					  enum v4l2_field field)
  {
  	struct soc_camera_device *icd = vq->priv_data;
  	struct sh_mobile_ceu_buffer *buf;
  	int bytes_per_line = soc_mbus_bytes_per_line(icd->user_width,
  						icd->current_fmt->host_fmt);
  	int ret;
  
  	if (bytes_per_line < 0)
  		return bytes_per_line;
  
  	buf = container_of(vb, struct sh_mobile_ceu_buffer, vb);
  
  	dev_dbg(icd->dev.parent, "%s (vb=0x%p) 0x%08lx %zd\n", __func__,
  		vb, vb->baddr, vb->bsize);
  
  	/* Added list head initialization on alloc */
  	WARN_ON(!list_empty(&vb->queue));
  
  #ifdef DEBUG
  	/*
  	 * This can be useful if you want to see if we actually fill
  	 * the buffer with something
  	 */
  	memset((void *)vb->baddr, 0xaa, vb->bsize);
  #endif
  
  	BUG_ON(NULL == icd->current_fmt);
  
  	if (buf->code	!= icd->current_fmt->code ||
  	    vb->width	!= icd->user_width ||
  	    vb->height	!= icd->user_height ||
  	    vb->field	!= field) {
  		buf->code	= icd->current_fmt->code;
  		vb->width	= icd->user_width;
  		vb->height	= icd->user_height;
  		vb->field	= field;
  		vb->state	= VIDEOBUF_NEEDS_INIT;
  	}
  
  	vb->size = vb->height * bytes_per_line;
  	if (0 != vb->baddr && vb->bsize < vb->size) {
  		ret = -EINVAL;
  		goto out;
  	}
  
  	if (vb->state == VIDEOBUF_NEEDS_INIT) {
  		ret = videobuf_iolock(vq, vb, NULL);
  		if (ret)
  			goto fail;
  		vb->state = VIDEOBUF_PREPARED;
  	}
  
  	return 0;
  fail:
  	free_buffer(vq, buf);
  out:
  	return ret;
  }
  
  /* Called under spinlock_irqsave(&pcdev->lock, ...) */
  static void sh_mobile_ceu_videobuf_queue(struct videobuf_queue *vq,
  					 struct videobuf_buffer *vb)
  {
  	struct soc_camera_device *icd = vq->priv_data;
  	struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
  	struct sh_mobile_ceu_dev *pcdev = ici->priv;
  
  	dev_dbg(icd->dev.parent, "%s (vb=0x%p) 0x%08lx %zd\n", __func__,
  		vb, vb->baddr, vb->bsize);
  
  	vb->state = VIDEOBUF_QUEUED;
  	list_add_tail(&vb->queue, &pcdev->capture);
  
  	if (!pcdev->active) {
  		/*
  		 * Because there were no active buffer at this moment,
  		 * we are not interested in the return value of
  		 * sh_mobile_ceu_capture here.
  		 */
  		pcdev->active = vb;
  		sh_mobile_ceu_capture(pcdev);
  	}
  }
  
  static void sh_mobile_ceu_videobuf_release(struct videobuf_queue *vq,
  					   struct videobuf_buffer *vb)
  {
  	struct soc_camera_device *icd = vq->priv_data;
  	struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
  	struct sh_mobile_ceu_dev *pcdev = ici->priv;
  	unsigned long flags;
  
  	spin_lock_irqsave(&pcdev->lock, flags);
  
  	if (pcdev->active == vb) {
  		/* disable capture (release DMA buffer), reset */
  		ceu_write(pcdev, CAPSR, 1 << 16);
  		pcdev->active = NULL;
  	}
  
  	if ((vb->state == VIDEOBUF_ACTIVE || vb->state == VIDEOBUF_QUEUED) &&
  	    !list_empty(&vb->queue)) {
  		vb->state = VIDEOBUF_ERROR;
  		list_del_init(&vb->queue);
  	}
  
  	spin_unlock_irqrestore(&pcdev->lock, flags);
  
  	free_buffer(vq, container_of(vb, struct sh_mobile_ceu_buffer, vb));
  }
  
  static struct videobuf_queue_ops sh_mobile_ceu_videobuf_ops = {
  	.buf_setup      = sh_mobile_ceu_videobuf_setup,
  	.buf_prepare    = sh_mobile_ceu_videobuf_prepare,
  	.buf_queue      = sh_mobile_ceu_videobuf_queue,
  	.buf_release    = sh_mobile_ceu_videobuf_release,
  };
  
  static irqreturn_t sh_mobile_ceu_irq(int irq, void *data)
  {
  	struct sh_mobile_ceu_dev *pcdev = data;
  	struct videobuf_buffer *vb;
  	unsigned long flags;
  
  	spin_lock_irqsave(&pcdev->lock, flags);
  
  	vb = pcdev->active;
  	if (!vb)
  		/* Stale interrupt from a released buffer */
  		goto out;
  
  	list_del_init(&vb->queue);
  
  	if (!list_empty(&pcdev->capture))
  		pcdev->active = list_entry(pcdev->capture.next,
  					   struct videobuf_buffer, queue);
  	else
  		pcdev->active = NULL;
  
  	vb->state = (sh_mobile_ceu_capture(pcdev) < 0) ?
  		VIDEOBUF_ERROR : VIDEOBUF_DONE;
  	do_gettimeofday(&vb->ts);
  	vb->field_count++;
  	wake_up(&vb->done);
  
  out:
  	spin_unlock_irqrestore(&pcdev->lock, flags);
  
  	return IRQ_HANDLED;
  }
  
  /* Called with .video_lock held */
  static int sh_mobile_ceu_add_device(struct soc_camera_device *icd)
  {
  	struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
  	struct sh_mobile_ceu_dev *pcdev = ici->priv;
  	int ret;
  
  	if (pcdev->icd)
  		return -EBUSY;
  
  	dev_info(icd->dev.parent,
  		 "SuperH Mobile CEU driver attached to camera %d\n",
  		 icd->devnum);
  
  	pm_runtime_get_sync(ici->v4l2_dev.dev);
  
  	ret = sh_mobile_ceu_soft_reset(pcdev);
  	if (!ret)
  		pcdev->icd = icd;
  
  	return ret;
  }
  
  /* Called with .video_lock held */
  static void sh_mobile_ceu_remove_device(struct soc_camera_device *icd)
  {
  	struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
  	struct sh_mobile_ceu_dev *pcdev = ici->priv;
  	unsigned long flags;
  
  	BUG_ON(icd != pcdev->icd);
  
  	/* disable capture, disable interrupts */
  	ceu_write(pcdev, CEIER, 0);
  	sh_mobile_ceu_soft_reset(pcdev);
  
  	/* make sure active buffer is canceled */
  	spin_lock_irqsave(&pcdev->lock, flags);
  	if (pcdev->active) {
  		list_del(&pcdev->active->queue);
  		pcdev->active->state = VIDEOBUF_ERROR;
  		wake_up_all(&pcdev->active->done);
  		pcdev->active = NULL;
  	}
  	spin_unlock_irqrestore(&pcdev->lock, flags);
  
  	pm_runtime_put_sync(ici->v4l2_dev.dev);
  
  	dev_info(icd->dev.parent,
  		 "SuperH Mobile CEU driver detached from camera %d\n",
  		 icd->devnum);
  
  	pcdev->icd = NULL;
  }
  
  /*
   * See chapter 29.4.12 "Capture Filter Control Register (CFLCR)"
   * in SH7722 Hardware Manual
   */
  static unsigned int size_dst(unsigned int src, unsigned int scale)
  {
  	unsigned int mant_pre = scale >> 12;
  	if (!src || !scale)
  		return src;
  	return ((mant_pre + 2 * (src - 1)) / (2 * mant_pre) - 1) *
  		mant_pre * 4096 / scale + 1;
  }
  
  static u16 calc_scale(unsigned int src, unsigned int *dst)
  {
  	u16 scale;
  
  	if (src == *dst)
  		return 0;
  
  	scale = (src * 4096 / *dst) & ~7;
  
  	while (scale > 4096 && size_dst(src, scale) < *dst)
  		scale -= 8;
  
  	*dst = size_dst(src, scale);
  
  	return scale;
  }
  
  /* rect is guaranteed to not exceed the scaled camera rectangle */
  static void sh_mobile_ceu_set_rect(struct soc_camera_device *icd)
  {
  	struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
  	struct sh_mobile_ceu_cam *cam = icd->host_priv;
  	struct sh_mobile_ceu_dev *pcdev = ici->priv;
  	unsigned int height, width, cdwdr_width, in_width, in_height;
  	unsigned int left_offset, top_offset;
  	u32 camor;
  
  	dev_geo(icd->dev.parent, "Crop %ux%u@%u:%u\n",
  		icd->user_width, icd->user_height, cam->ceu_left, cam->ceu_top);
  
  	left_offset	= cam->ceu_left;
  	top_offset	= cam->ceu_top;
  
  	/* CEU cropping (CFSZR) is applied _after_ the scaling filter (CFLCR) */
  	if (pcdev->image_mode) {
  		in_width = cam->width;
  		if (!pcdev->is_16bit) {
  			in_width *= 2;
  			left_offset *= 2;
  		}
  		width = icd->user_width;
  		cdwdr_width = icd->user_width;
  	} else {
  		int bytes_per_line = soc_mbus_bytes_per_line(icd->user_width,
  						icd->current_fmt->host_fmt);
  		unsigned int w_factor;
  
  		width = icd->user_width;
  
  		switch (icd->current_fmt->host_fmt->packing) {
  		case SOC_MBUS_PACKING_2X8_PADHI:
  			w_factor = 2;
  			break;
  		default:
  			w_factor = 1;
  		}
  
  		in_width = cam->width * w_factor;
  		left_offset = left_offset * w_factor;
  
  		if (bytes_per_line < 0)
  			cdwdr_width = icd->user_width;
  		else
  			cdwdr_width = bytes_per_line;
  	}
  
  	height = icd->user_height;
  	in_height = cam->height;
  	if (V4L2_FIELD_NONE != pcdev->field) {
  		height /= 2;
  		in_height /= 2;
  		top_offset /= 2;
  		cdwdr_width *= 2;
  	}
  
  	/* CSI2 special configuration */
  	if (pcdev->pdata->csi2_dev) {
  		in_width = ((in_width - 2) * 2);
  		left_offset *= 2;
  	}
  
  	/* Set CAMOR, CAPWR, CFSZR, take care of CDWDR */
  	camor = left_offset | (top_offset << 16);
  
  	dev_geo(icd->dev.parent,
  		"CAMOR 0x%x, CAPWR 0x%x, CFSZR 0x%x, CDWDR 0x%x\n", camor,
  		(in_height << 16) | in_width, (height << 16) | width,
  		cdwdr_width);
  
  	ceu_write(pcdev, CAMOR, camor);
  	ceu_write(pcdev, CAPWR, (in_height << 16) | in_width);
  	ceu_write(pcdev, CFSZR, (height << 16) | width);
  	ceu_write(pcdev, CDWDR, cdwdr_width);
  }
  
  static u32 capture_save_reset(struct sh_mobile_ceu_dev *pcdev)
  {
  	u32 capsr = ceu_read(pcdev, CAPSR);
  	ceu_write(pcdev, CAPSR, 1 << 16); /* reset, stop capture */
  	return capsr;
  }
  
  static void capture_restore(struct sh_mobile_ceu_dev *pcdev, u32 capsr)
  {
  	unsigned long timeout = jiffies + 10 * HZ;
  
  	/*
  	 * Wait until the end of the current frame. It can take a long time,
  	 * but if it has been aborted by a CAPSR reset, it shoule exit sooner.
  	 */
  	while ((ceu_read(pcdev, CSTSR) & 1) && time_before(jiffies, timeout))
  		msleep(1);
  
  	if (time_after(jiffies, timeout)) {
  		dev_err(pcdev->ici.v4l2_dev.dev,
  			"Timeout waiting for frame end! Interface problem?\n");
  		return;
  	}
  
  	/* Wait until reset clears, this shall not hang... */
  	while (ceu_read(pcdev, CAPSR) & (1 << 16))
  		udelay(10);
  
  	/* Anything to restore? */
  	if (capsr & ~(1 << 16))
  		ceu_write(pcdev, CAPSR, capsr);
  }
  
  static int sh_mobile_ceu_set_bus_param(struct soc_camera_device *icd,
  				       __u32 pixfmt)
  {
  	struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
  	struct sh_mobile_ceu_dev *pcdev = ici->priv;
  	int ret;
  	unsigned long camera_flags, common_flags, value;
  	int yuv_lineskip;
  	struct sh_mobile_ceu_cam *cam = icd->host_priv;
  	u32 capsr = capture_save_reset(pcdev);
  
  	camera_flags = icd->ops->query_bus_param(icd);
  	common_flags = soc_camera_bus_param_compatible(camera_flags,
  						       make_bus_param(pcdev));
  	if (!common_flags)
  		return -EINVAL;
  
  	/* Make choises, based on platform preferences */
  	if ((common_flags & SOCAM_HSYNC_ACTIVE_HIGH) &&
  	    (common_flags & SOCAM_HSYNC_ACTIVE_LOW)) {
  		if (pcdev->pdata->flags & SH_CEU_FLAG_HSYNC_LOW)
  			common_flags &= ~SOCAM_HSYNC_ACTIVE_HIGH;
  		else
  			common_flags &= ~SOCAM_HSYNC_ACTIVE_LOW;
  	}
  
  	if ((common_flags & SOCAM_VSYNC_ACTIVE_HIGH) &&
  	    (common_flags & SOCAM_VSYNC_ACTIVE_LOW)) {
  		if (pcdev->pdata->flags & SH_CEU_FLAG_VSYNC_LOW)
  			common_flags &= ~SOCAM_VSYNC_ACTIVE_HIGH;
  		else
  			common_flags &= ~SOCAM_VSYNC_ACTIVE_LOW;
  	}
  
  	ret = icd->ops->set_bus_param(icd, common_flags);
  	if (ret < 0)
  		return ret;
  
  	switch (common_flags & SOCAM_DATAWIDTH_MASK) {
  	case SOCAM_DATAWIDTH_8:
  		pcdev->is_16bit = 0;
  		break;
  	case SOCAM_DATAWIDTH_16:
  		pcdev->is_16bit = 1;
  		break;
  	default:
  		return -EINVAL;
  	}
  
  	ceu_write(pcdev, CRCNTR, 0);
  	ceu_write(pcdev, CRCMPR, 0);
  
  	value = 0x00000010; /* data fetch by default */
  	yuv_lineskip = 0;
  
  	switch (icd->current_fmt->host_fmt->fourcc) {
  	case V4L2_PIX_FMT_NV12:
  	case V4L2_PIX_FMT_NV21:
  		yuv_lineskip = 1; /* skip for NV12/21, no skip for NV16/61 */
  		/* fall-through */
  	case V4L2_PIX_FMT_NV16:
  	case V4L2_PIX_FMT_NV61:
  		switch (cam->code) {
  		case V4L2_MBUS_FMT_UYVY8_2X8:
  			value = 0x00000000; /* Cb0, Y0, Cr0, Y1 */
  			break;
  		case V4L2_MBUS_FMT_VYUY8_2X8:
  			value = 0x00000100; /* Cr0, Y0, Cb0, Y1 */
  			break;
  		case V4L2_MBUS_FMT_YUYV8_2X8:
  			value = 0x00000200; /* Y0, Cb0, Y1, Cr0 */
  			break;
  		case V4L2_MBUS_FMT_YVYU8_2X8:
  			value = 0x00000300; /* Y0, Cr0, Y1, Cb0 */
  			break;
  		default:
  			BUG();
  		}
  	}
  
  	if (icd->current_fmt->host_fmt->fourcc == V4L2_PIX_FMT_NV21 ||
  	    icd->current_fmt->host_fmt->fourcc == V4L2_PIX_FMT_NV61)
  		value ^= 0x00000100; /* swap U, V to change from NV1x->NVx1 */
  
  	value |= common_flags & SOCAM_VSYNC_ACTIVE_LOW ? 1 << 1 : 0;
  	value |= common_flags & SOCAM_HSYNC_ACTIVE_LOW ? 1 << 0 : 0;
  	value |= pcdev->is_16bit ? 1 << 12 : 0;
  
  	/* CSI2 mode */
  	if (pcdev->pdata->csi2_dev)
  		value |= 3 << 12;
  
  	ceu_write(pcdev, CAMCR, value);
  
  	ceu_write(pcdev, CAPCR, 0x00300000);
  
  	switch (pcdev->field) {
  	case V4L2_FIELD_INTERLACED_TB:
  		value = 0x101;
  		break;
  	case V4L2_FIELD_INTERLACED_BT:
  		value = 0x102;
  		break;
  	default:
  		value = 0;
  		break;
  	}
  	ceu_write(pcdev, CAIFR, value);
  
  	sh_mobile_ceu_set_rect(icd);
  	mdelay(1);
  
  	dev_geo(icd->dev.parent, "CFLCR 0x%x\n", pcdev->cflcr);
  	ceu_write(pcdev, CFLCR, pcdev->cflcr);
  
  	/*
  	 * A few words about byte order (observed in Big Endian mode)
  	 *
  	 * In data fetch mode bytes are received in chunks of 8 bytes.
  	 * D0, D1, D2, D3, D4, D5, D6, D7 (D0 received first)
  	 *
  	 * The data is however by default written to memory in reverse order:
  	 * D7, D6, D5, D4, D3, D2, D1, D0 (D7 written to lowest byte)
  	 *
  	 * The lowest three bits of CDOCR allows us to do swapping,
  	 * using 7 we swap the data bytes to match the incoming order:
  	 * D0, D1, D2, D3, D4, D5, D6, D7
  	 */
  	value = 0x00000017;
  	if (yuv_lineskip)
  		value &= ~0x00000010; /* convert 4:2:2 -> 4:2:0 */
  
  	ceu_write(pcdev, CDOCR, value);
  	ceu_write(pcdev, CFWCR, 0); /* keep "datafetch firewall" disabled */
  
  	dev_dbg(icd->dev.parent, "S_FMT successful for %c%c%c%c %ux%u\n",
  		pixfmt & 0xff, (pixfmt >> 8) & 0xff,
  		(pixfmt >> 16) & 0xff, (pixfmt >> 24) & 0xff,
  		icd->user_width, icd->user_height);
  
  	capture_restore(pcdev, capsr);
  
  	/* not in bundle mode: skip CBDSR, CDAYR2, CDACR2, CDBYR2, CDBCR2 */
  	return 0;
  }
  
  static int sh_mobile_ceu_try_bus_param(struct soc_camera_device *icd,
  				       unsigned char buswidth)
  {
  	struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
  	struct sh_mobile_ceu_dev *pcdev = ici->priv;
  	unsigned long camera_flags, common_flags;
  
  	camera_flags = icd->ops->query_bus_param(icd);
  	common_flags = soc_camera_bus_param_compatible(camera_flags,
  						       make_bus_param(pcdev));
  	if (!common_flags || buswidth > 16 ||
  	    (buswidth > 8 && !(common_flags & SOCAM_DATAWIDTH_16)))
  		return -EINVAL;
  
  	return 0;
  }
  
  static const struct soc_mbus_pixelfmt sh_mobile_ceu_formats[] = {
  	{
  		.fourcc			= V4L2_PIX_FMT_NV12,
  		.name			= "NV12",
  		.bits_per_sample	= 12,
  		.packing		= SOC_MBUS_PACKING_NONE,
  		.order			= SOC_MBUS_ORDER_LE,
  	}, {
  		.fourcc			= V4L2_PIX_FMT_NV21,
  		.name			= "NV21",
  		.bits_per_sample	= 12,
  		.packing		= SOC_MBUS_PACKING_NONE,
  		.order			= SOC_MBUS_ORDER_LE,
  	}, {
  		.fourcc			= V4L2_PIX_FMT_NV16,
  		.name			= "NV16",
  		.bits_per_sample	= 16,
  		.packing		= SOC_MBUS_PACKING_NONE,
  		.order			= SOC_MBUS_ORDER_LE,
  	}, {
  		.fourcc			= V4L2_PIX_FMT_NV61,
  		.name			= "NV61",
  		.bits_per_sample	= 16,
  		.packing		= SOC_MBUS_PACKING_NONE,
  		.order			= SOC_MBUS_ORDER_LE,
  	},
  };
  
  /* This will be corrected as we get more formats */
  static bool sh_mobile_ceu_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 client_g_rect(struct v4l2_subdev *sd, struct v4l2_rect *rect);
  
  static int sh_mobile_ceu_get_formats(struct soc_camera_device *icd, unsigned int idx,
  				     struct soc_camera_format_xlate *xlate)
  {
  	struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
  	struct device *dev = icd->dev.parent;
  	struct soc_camera_host *ici = to_soc_camera_host(dev);
  	struct sh_mobile_ceu_dev *pcdev = ici->priv;
  	int ret, k, n;
  	int formats = 0;
  	struct sh_mobile_ceu_cam *cam;
  	enum v4l2_mbus_pixelcode code;
  	const struct soc_mbus_pixelfmt *fmt;
  
  	ret = v4l2_subdev_call(sd, video, enum_mbus_fmt, idx, &code);
  	if (ret < 0)
  		/* No more formats */
  		return 0;
  
  	fmt = soc_mbus_get_fmtdesc(code);
  	if (!fmt) {
  		dev_err(dev, "Invalid format code #%u: %d\n", idx, code);
  		return -EINVAL;
  	}
  
  	if (!pcdev->pdata->csi2_dev) {
  		ret = sh_mobile_ceu_try_bus_param(icd, fmt->bits_per_sample);
  		if (ret < 0)
  			return 0;
  	}
  
  	if (!icd->host_priv) {
  		struct v4l2_mbus_framefmt mf;
  		struct v4l2_rect rect;
  		int shift = 0;
  
  
  		/* Cache current client geometry */
  		ret = client_g_rect(sd, &rect);
  		if (ret < 0)
  			return ret;
  
  		/* First time */
  		ret = v4l2_subdev_call(sd, video, g_mbus_fmt, &mf);
  		if (ret < 0)
  			return ret;
  
  		while ((mf.width > 2560 || mf.height > 1920) && shift < 4) {
  			/* Try 2560x1920, 1280x960, 640x480, 320x240 */
  			mf.width	= 2560 >> shift;
  			mf.height	= 1920 >> shift;
  			ret = v4l2_device_call_until_err(sd->v4l2_dev, 0, video,
  							 s_mbus_fmt, &mf);
  			if (ret < 0)
  				return ret;
  			shift++;
  		}
  
  		if (shift == 4) {
  			dev_err(dev, "Failed to configure the client below %ux%x\n",
  				mf.width, mf.height);
  			return -EIO;
  		}
  
  		dev_geo(dev, "camera fmt %ux%u\n", mf.width, mf.height);
  
  		cam = kzalloc(sizeof(*cam), GFP_KERNEL);
  		if (!cam)
  			return -ENOMEM;
  
  		/* We are called with current camera crop, initialise subrect with it */
  		cam->rect	= rect;
  		cam->subrect	= rect;
  
  		cam->width	= mf.width;
  		cam->height	= mf.height;
  
  		cam->width	= mf.width;
  		cam->height	= mf.height;
  
  		icd->host_priv = cam;
  	} else {
  		cam = icd->host_priv;
  	}
  
  	/* Beginning of a pass */
  	if (!idx)
  		cam->extra_fmt = NULL;
  
  	switch (code) {
  	case V4L2_MBUS_FMT_UYVY8_2X8:
  	case V4L2_MBUS_FMT_VYUY8_2X8:
  	case V4L2_MBUS_FMT_YUYV8_2X8:
  	case V4L2_MBUS_FMT_YVYU8_2X8:
  		if (cam->extra_fmt)
  			break;
  
  		/*
  		 * Our case is simple so far: for any of the above four camera
  		 * formats we add all our four synthesized NV* formats, so,
  		 * just marking the device with a single flag suffices. If
  		 * the format generation rules are more complex, you would have
  		 * to actually hang your already added / counted formats onto
  		 * the host_priv pointer and check whether the format you're
  		 * going to add now is already there.
  		 */
  		cam->extra_fmt = sh_mobile_ceu_formats;
  
  		n = ARRAY_SIZE(sh_mobile_ceu_formats);
  		formats += n;
  		for (k = 0; xlate && k < n; k++) {
  			xlate->host_fmt	= &sh_mobile_ceu_formats[k];
  			xlate->code	= code;
  			xlate++;
  			dev_dbg(dev, "Providing format %s using code %d\n",
  				sh_mobile_ceu_formats[k].name, code);
  		}
  		break;
  	default:
  		if (!sh_mobile_ceu_packing_supported(fmt))
  			return 0;
  	}
  
  	/* Generic pass-through */
  	formats++;
  	if (xlate) {
  		xlate->host_fmt	= fmt;
  		xlate->code	= code;
  		xlate++;
  		dev_dbg(dev, "Providing format %s in pass-through mode\n",
  			fmt->name);
  	}
  
  	return formats;
  }
  
  static void sh_mobile_ceu_put_formats(struct soc_camera_device *icd)
  {
  	kfree(icd->host_priv);
  	icd->host_priv = NULL;
  }
  
  /* Check if any dimension of r1 is smaller than respective one of r2 */
  static bool is_smaller(struct v4l2_rect *r1, struct v4l2_rect *r2)
  {
  	return r1->width < r2->width || r1->height < r2->height;
  }
  
  /* Check if r1 fails to cover r2 */
  static bool is_inside(struct v4l2_rect *r1, struct v4l2_rect *r2)
  {
  	return r1->left > r2->left || r1->top > r2->top ||
  		r1->left + r1->width < r2->left + r2->width ||
  		r1->top + r1->height < r2->top + r2->height;
  }
  
  static unsigned int scale_down(unsigned int size, unsigned int scale)
  {
  	return (size * 4096 + scale / 2) / scale;
  }
  
  static unsigned int calc_generic_scale(unsigned int input, unsigned int output)
  {
  	return (input * 4096 + output / 2) / output;
  }
  
  /* Get and store current client crop */
  static int client_g_rect(struct v4l2_subdev *sd, struct v4l2_rect *rect)
  {
  	struct v4l2_crop crop;
  	struct v4l2_cropcap cap;
  	int ret;
  
  	crop.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
  
  	ret = v4l2_subdev_call(sd, video, g_crop, &crop);
  	if (!ret) {
  		*rect = crop.c;
  		return ret;
  	}
  
  	/* Camera driver doesn't support .g_crop(), assume default rectangle */
  	cap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
  
  	ret = v4l2_subdev_call(sd, video, cropcap, &cap);
  	if (!ret)
  		*rect = cap.defrect;
  
  	return ret;
  }
  
  /* Client crop has changed, update our sub-rectangle to remain within the area */
  static void update_subrect(struct sh_mobile_ceu_cam *cam)
  {
  	struct v4l2_rect *rect = &cam->rect, *subrect = &cam->subrect;
  
  	if (rect->width < subrect->width)
  		subrect->width = rect->width;
  
  	if (rect->height < subrect->height)
  		subrect->height = rect->height;
  
  	if (rect->left > subrect->left)
  		subrect->left = rect->left;
  	else if (rect->left + rect->width >
  		 subrect->left + subrect->width)
  		subrect->left = rect->left + rect->width -
  			subrect->width;
  
  	if (rect->top > subrect->top)
  		subrect->top = rect->top;
  	else if (rect->top + rect->height >
  		 subrect->top + subrect->height)
  		subrect->top = rect->top + rect->height -
  			subrect->height;
  }
  
  /*
   * The common for both scaling and cropping iterative approach is:
   * 1. try if the client can produce exactly what requested by the user
   * 2. if (1) failed, try to double the client image until we get one big enough
   * 3. if (2) failed, try to request the maximum image
   */
  static int client_s_crop(struct soc_camera_device *icd, struct v4l2_crop *crop,
  			 struct v4l2_crop *cam_crop)
  {
  	struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
  	struct v4l2_rect *rect = &crop->c, *cam_rect = &cam_crop->c;
  	struct device *dev = sd->v4l2_dev->dev;
  	struct sh_mobile_ceu_cam *cam = icd->host_priv;
  	struct v4l2_cropcap cap;
  	int ret;
  	unsigned int width, height;
  
  	v4l2_subdev_call(sd, video, s_crop, crop);
  	ret = client_g_rect(sd, cam_rect);
  	if (ret < 0)
  		return ret;
  
  	/*
  	 * Now cam_crop contains the current camera input rectangle, and it must
  	 * be within camera cropcap bounds
  	 */
  	if (!memcmp(rect, cam_rect, sizeof(*rect))) {
  		/* Even if camera S_CROP failed, but camera rectangle matches */
  		dev_dbg(dev, "Camera S_CROP successful for %dx%d@%d:%d\n",
  			rect->width, rect->height, rect->left, rect->top);
  		cam->rect = *cam_rect;
  		return 0;
  	}
  
  	/* Try to fix cropping, that camera hasn't managed to set */
  	dev_geo(dev, "Fix camera S_CROP for %dx%d@%d:%d to %dx%d@%d:%d\n",
  		cam_rect->width, cam_rect->height,
  		cam_rect->left, cam_rect->top,
  		rect->width, rect->height, rect->left, rect->top);
  
  	/* We need sensor maximum rectangle */
  	ret = v4l2_subdev_call(sd, video, cropcap, &cap);
  	if (ret < 0)
  		return ret;
  
  	/* Put user requested rectangle within sensor bounds */
  	soc_camera_limit_side(&rect->left, &rect->width, cap.bounds.left, 2,
  			      cap.bounds.width);
  	soc_camera_limit_side(&rect->top, &rect->height, cap.bounds.top, 4,
  			      cap.bounds.height);
  
  	/*
  	 * Popular special case - some cameras can only handle fixed sizes like
  	 * QVGA, VGA,... Take care to avoid infinite loop.
  	 */
  	width = max(cam_rect->width, 2);
  	height = max(cam_rect->height, 2);
  
  	/*
  	 * Loop as long as sensor is not covering the requested rectangle and
  	 * is still within its bounds
  	 */
  	while (!ret && (is_smaller(cam_rect, rect) ||
  			is_inside(cam_rect, rect)) &&
  	       (cap.bounds.width > width || cap.bounds.height > height)) {
  
  		width *= 2;
  		height *= 2;
  
  		cam_rect->width = width;
  		cam_rect->height = height;
  
  		/*
  		 * We do not know what capabilities the camera has to set up
  		 * left and top borders. We could try to be smarter in iterating
  		 * them, e.g., if camera current left is to the right of the
  		 * target left, set it to the middle point between the current
  		 * left and minimum left. But that would add too much
  		 * complexity: we would have to iterate each border separately.
  		 * Instead we just drop to the left and top bounds.
  		 */
  		if (cam_rect->left > rect->left)
  			cam_rect->left = cap.bounds.left;
  
  		if (cam_rect->left + cam_rect->width < rect->left + rect->width)
  			cam_rect->width = rect->left + rect->width -
  				cam_rect->left;
  
  		if (cam_rect->top > rect->top)
  			cam_rect->top = cap.bounds.top;
  
  		if (cam_rect->top + cam_rect->height < rect->top + rect->height)
  			cam_rect->height = rect->top + rect->height -
  				cam_rect->top;
  
  		v4l2_subdev_call(sd, video, s_crop, cam_crop);
  		ret = client_g_rect(sd, cam_rect);
  		dev_geo(dev, "Camera S_CROP %d for %dx%d@%d:%d\n", ret,
  			cam_rect->width, cam_rect->height,
  			cam_rect->left, cam_rect->top);
  	}
  
  	/* S_CROP must not modify the rectangle */
  	if (is_smaller(cam_rect, rect) || is_inside(cam_rect, rect)) {
  		/*
  		 * The camera failed to configure a suitable cropping,
  		 * we cannot use the current rectangle, set to max
  		 */
  		*cam_rect = cap.bounds;
  		v4l2_subdev_call(sd, video, s_crop, cam_crop);
  		ret = client_g_rect(sd, cam_rect);
  		dev_geo(dev, "Camera S_CROP %d for max %dx%d@%d:%d\n", ret,
  			cam_rect->width, cam_rect->height,
  			cam_rect->left, cam_rect->top);
  	}
  
  	if (!ret) {
  		cam->rect = *cam_rect;
  		update_subrect(cam);
  	}
  
  	return ret;
  }
  
  /* Iterative s_mbus_fmt, also updates cached client crop on success */
  static int client_s_fmt(struct soc_camera_device *icd,
  			struct v4l2_mbus_framefmt *mf, bool ceu_can_scale)
  {
  	struct sh_mobile_ceu_cam *cam = icd->host_priv;
  	struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
  	struct device *dev = icd->dev.parent;
  	unsigned int width = mf->width, height = mf->height, tmp_w, tmp_h;
  	unsigned int max_width, max_height;
  	struct v4l2_cropcap cap;
  	int ret;
  
  	ret = v4l2_device_call_until_err(sd->v4l2_dev, 0, video,
  					 s_mbus_fmt, mf);
  	if (ret < 0)
  		return ret;
  
  	dev_geo(dev, "camera scaled to %ux%u\n", mf->width, mf->height);
  
  	if ((width == mf->width && height == mf->height) || !ceu_can_scale)
  		goto update_cache;
  
  	cap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
  
  	ret = v4l2_subdev_call(sd, video, cropcap, &cap);
  	if (ret < 0)
  		return ret;
  
  	max_width = min(cap.bounds.width, 2560);
  	max_height = min(cap.bounds.height, 1920);
  
  	/* Camera set a format, but geometry is not precise, try to improve */
  	tmp_w = mf->width;
  	tmp_h = mf->height;
  
  	/* width <= max_width && height <= max_height - guaranteed by try_fmt */
  	while ((width > tmp_w || height > tmp_h) &&
  	       tmp_w < max_width && tmp_h < max_height) {
  		tmp_w = min(2 * tmp_w, max_width);
  		tmp_h = min(2 * tmp_h, max_height);
  		mf->width = tmp_w;
  		mf->height = tmp_h;
  		ret = v4l2_device_call_until_err(sd->v4l2_dev, 0, video,
  						 s_mbus_fmt, mf);
  		dev_geo(dev, "Camera scaled to %ux%u\n",
  			mf->width, mf->height);
  		if (ret < 0) {
  			/* This shouldn't happen */
  			dev_err(dev, "Client failed to set format: %d\n", ret);
  			return ret;
  		}
  	}
  
  update_cache:
  	/* Update cache */
  	ret = client_g_rect(sd, &cam->rect);
  	if (ret < 0)
  		return ret;
  
  	update_subrect(cam);
  
  	return 0;
  }
  
  /**
   * @width	- on output: user width, mapped back to input
   * @height	- on output: user height, mapped back to input
   * @mf		- in- / output camera output window
   */
  static int client_scale(struct soc_camera_device *icd,
  			struct v4l2_mbus_framefmt *mf,
  			unsigned int *width, unsigned int *height,
  			bool ceu_can_scale)
  {
  	struct sh_mobile_ceu_cam *cam = icd->host_priv;
  	struct device *dev = icd->dev.parent;
  	struct v4l2_mbus_framefmt mf_tmp = *mf;
  	unsigned int scale_h, scale_v;
  	int ret;
  
  	/*
  	 * 5. Apply iterative camera S_FMT for camera user window (also updates
  	 *    client crop cache and the imaginary sub-rectangle).
  	 */
  	ret = client_s_fmt(icd, &mf_tmp, ceu_can_scale);
  	if (ret < 0)
  		return ret;
  
  	dev_geo(dev, "5: camera scaled to %ux%u\n",
  		mf_tmp.width, mf_tmp.height);
  
  	/* 6. Retrieve camera output window (g_fmt) */
  
  	/* unneeded - it is already in "mf_tmp" */
  
  	/* 7. Calculate new client scales. */
  	scale_h = calc_generic_scale(cam->rect.width, mf_tmp.width);
  	scale_v = calc_generic_scale(cam->rect.height, mf_tmp.height);
  
  	mf->width	= mf_tmp.width;
  	mf->height	= mf_tmp.height;
  	mf->colorspace	= mf_tmp.colorspace;
  
  	/*
  	 * 8. Calculate new CEU crop - apply camera scales to previously
  	 *    updated "effective" crop.
  	 */
  	*width = scale_down(cam->subrect.width, scale_h);
  	*height = scale_down(cam->subrect.height, scale_v);
  
  	dev_geo(dev, "8: new client sub-window %ux%u\n", *width, *height);
  
  	return 0;
  }
  
  /*
   * CEU can scale and crop, but we don't want to waste bandwidth and kill the
   * framerate by always requesting the maximum image from the client. See
   * Documentation/video4linux/sh_mobile_camera_ceu.txt for a description of
   * scaling and cropping algorithms and for the meaning of referenced here steps.
   */
  static int sh_mobile_ceu_set_crop(struct soc_camera_device *icd,
  				  struct v4l2_crop *a)
  {
  	struct v4l2_rect *rect = &a->c;
  	struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
  	struct sh_mobile_ceu_dev *pcdev = ici->priv;
  	struct v4l2_crop cam_crop;
  	struct sh_mobile_ceu_cam *cam = icd->host_priv;
  	struct v4l2_rect *cam_rect = &cam_crop.c;
  	struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
  	struct device *dev = icd->dev.parent;
  	struct v4l2_mbus_framefmt mf;
  	unsigned int scale_cam_h, scale_cam_v, scale_ceu_h, scale_ceu_v,
  		out_width, out_height, scale_h, scale_v;
  	int interm_width, interm_height;
  	u32 capsr, cflcr;
  	int ret;
  
  	dev_geo(dev, "S_CROP(%ux%u@%u:%u)\n", rect->width, rect->height,
  		rect->left, rect->top);
  
  	/* During camera cropping its output window can change too, stop CEU */
  	capsr = capture_save_reset(pcdev);
  	dev_dbg(dev, "CAPSR 0x%x, CFLCR 0x%x\n", capsr, pcdev->cflcr);
  
  	/* 1. - 2. Apply iterative camera S_CROP for new input window. */
  	ret = client_s_crop(icd, a, &cam_crop);
  	if (ret < 0)
  		return ret;
  
  	dev_geo(dev, "1-2: camera cropped to %ux%u@%u:%u\n",
  		cam_rect->width, cam_rect->height,
  		cam_rect->left, cam_rect->top);
  
  	/* On success cam_crop contains current camera crop */
  
  	/* 3. Retrieve camera output window */
  	ret = v4l2_subdev_call(sd, video, g_mbus_fmt, &mf);
  	if (ret < 0)
  		return ret;
  
  	if (mf.width > 2560 || mf.height > 1920)
  		return -EINVAL;
  
  	/* Cache camera output window */
  	cam->width	= mf.width;
  	cam->height	= mf.height;
  
  	/* 4. Calculate camera scales */
  	scale_cam_h	= calc_generic_scale(cam_rect->width, mf.width);
  	scale_cam_v	= calc_generic_scale(cam_rect->height, mf.height);
  
  	/* Calculate intermediate window */
  	interm_width	= scale_down(rect->width, scale_cam_h);
  	interm_height	= scale_down(rect->height, scale_cam_v);
  
  	if (pcdev->image_mode) {
  		out_width	= min(interm_width, icd->user_width);
  		out_height	= min(interm_height, icd->user_height);
  	} else {
  		out_width	= interm_width;
  		out_height	= interm_height;
  	}
  
  	/*
  	 * 5. Calculate CEU scales from camera scales from results of (5) and
  	 *    the user window
  	 */
  	scale_ceu_h	= calc_scale(interm_width, &out_width);
  	scale_ceu_v	= calc_scale(interm_height, &out_height);
  
  	/* Calculate camera scales */
  	scale_h		= calc_generic_scale(cam_rect->width, out_width);
  	scale_v		= calc_generic_scale(cam_rect->height, out_height);
  
  	dev_geo(dev, "5: CEU scales %u:%u\n", scale_ceu_h, scale_ceu_v);
  
  	/* Apply CEU scales. */
  	cflcr = scale_ceu_h | (scale_ceu_v << 16);
  	if (cflcr != pcdev->cflcr) {
  		pcdev->cflcr = cflcr;
  		ceu_write(pcdev, CFLCR, cflcr);
  	}
  
  	icd->user_width	 = out_width;
  	icd->user_height = out_height;
  	cam->ceu_left	 = scale_down(rect->left - cam_rect->left, scale_h) & ~1;
  	cam->ceu_top	 = scale_down(rect->top - cam_rect->top, scale_v) & ~1;
  
  	/* 6. Use CEU cropping to crop to the new window. */
  	sh_mobile_ceu_set_rect(icd);
  
  	cam->subrect = *rect;
  
  	dev_geo(dev, "6: CEU cropped to %ux%u@%u:%u\n",
  		icd->user_width, icd->user_height,
  		cam->ceu_left, cam->ceu_top);
  
  	/* Restore capture */
  	if (pcdev->active)
  		capsr |= 1;
  	capture_restore(pcdev, capsr);
  
  	/* Even if only camera cropping succeeded */
  	return ret;
  }
  
  static int sh_mobile_ceu_get_crop(struct soc_camera_device *icd,
  				  struct v4l2_crop *a)
  {
  	struct sh_mobile_ceu_cam *cam = icd->host_priv;
  
  	a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
  	a->c = cam->subrect;
  
  	return 0;
  }
  
  /*
   * Calculate real client output window by applying new scales to the current
   * client crop. New scales are calculated from the requested output format and
   * CEU crop, mapped backed onto the client input (subrect).
   */
  static void calculate_client_output(struct soc_camera_device *icd,
  		struct v4l2_pix_format *pix, struct v4l2_mbus_framefmt *mf)
  {
  	struct sh_mobile_ceu_cam *cam = icd->host_priv;
  	struct device *dev = icd->dev.parent;
  	struct v4l2_rect *cam_subrect = &cam->subrect;
  	unsigned int scale_v, scale_h;
  
  	if (cam_subrect->width == cam->rect.width &&
  	    cam_subrect->height == cam->rect.height) {
  		/* No sub-cropping */
  		mf->width	= pix->width;
  		mf->height	= pix->height;
  		return;
  	}
  
  	/* 1.-2. Current camera scales and subwin - cached. */
  
  	dev_geo(dev, "2: subwin %ux%u@%u:%u\n",
  		cam_subrect->width, cam_subrect->height,
  		cam_subrect->left, cam_subrect->top);
  
  	/*
  	 * 3. Calculate new combined scales from input sub-window to requested
  	 *    user window.
  	 */
  
  	/*
  	 * TODO: CEU cannot scale images larger than VGA to smaller than SubQCIF
  	 * (128x96) or larger than VGA
  	 */
  	scale_h = calc_generic_scale(cam_subrect->width, pix->width);
  	scale_v = calc_generic_scale(cam_subrect->height, pix->height);
  
  	dev_geo(dev, "3: scales %u:%u\n", scale_h, scale_v);
  
  	/*
  	 * 4. Calculate client output window by applying combined scales to real
  	 *    input window.
  	 */
  	mf->width	= scale_down(cam->rect.width, scale_h);
  	mf->height	= scale_down(cam->rect.height, scale_v);
  }
  
  /* Similar to set_crop multistage iterative algorithm */
  static int sh_mobile_ceu_set_fmt(struct soc_camera_device *icd,
  				 struct v4l2_format *f)
  {
  	struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
  	struct sh_mobile_ceu_dev *pcdev = ici->priv;
  	struct sh_mobile_ceu_cam *cam = icd->host_priv;
  	struct v4l2_pix_format *pix = &f->fmt.pix;
  	struct v4l2_mbus_framefmt mf;
  	struct device *dev = icd->dev.parent;
  	__u32 pixfmt = pix->pixelformat;
  	const struct soc_camera_format_xlate *xlate;
  	/* Keep Compiler Happy */
  	unsigned int ceu_sub_width = 0, ceu_sub_height = 0;
  	u16 scale_v, scale_h;
  	int ret;
  	bool image_mode;
  	enum v4l2_field field;
  
  	dev_geo(dev, "S_FMT(pix=0x%x, %ux%u)\n", pixfmt, pix->width, pix->height);
  
  	switch (pix->field) {
  	default:
  		pix->field = V4L2_FIELD_NONE;
  		/* fall-through */
  	case V4L2_FIELD_INTERLACED_TB:
  	case V4L2_FIELD_INTERLACED_BT:
  	case V4L2_FIELD_NONE:
  		field = pix->field;
  		break;
  	case V4L2_FIELD_INTERLACED:
  		field = V4L2_FIELD_INTERLACED_TB;
  		break;
  	}
  
  	xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
  	if (!xlate) {
  		dev_warn(dev, "Format %x not found\n", pixfmt);
  		return -EINVAL;
  	}
  
  	/* 1.-4. Calculate client output geometry */
  	calculate_client_output(icd, &f->fmt.pix, &mf);
  	mf.field	= pix->field;
  	mf.colorspace	= pix->colorspace;
  	mf.code		= xlate->code;
  
  	switch (pixfmt) {
  	case V4L2_PIX_FMT_NV12:
  	case V4L2_PIX_FMT_NV21:
  	case V4L2_PIX_FMT_NV16:
  	case V4L2_PIX_FMT_NV61:
  		image_mode = true;
  		break;
  	default:
  		image_mode = false;
  	}
  
  	dev_geo(dev, "4: request camera output %ux%u\n", mf.width, mf.height);
  
  	/* 5. - 9. */
  	ret = client_scale(icd, &mf, &ceu_sub_width, &ceu_sub_height,
  			   image_mode && V4L2_FIELD_NONE == field);
  
  	dev_geo(dev, "5-9: client scale return %d\n", ret);
  
  	/* Done with the camera. Now see if we can improve the result */
  
  	dev_geo(dev, "fmt %ux%u, requested %ux%u\n",
  		mf.width, mf.height, pix->width, pix->height);
  	if (ret < 0)
  		return ret;
  
  	if (mf.code != xlate->code)
  		return -EINVAL;
  
  	/* 9. Prepare CEU crop */
  	cam->width = mf.width;
  	cam->height = mf.height;
  
  	/* 10. Use CEU scaling to scale to the requested user window. */
  
  	/* We cannot scale up */
  	if (pix->width > ceu_sub_width)
  		ceu_sub_width = pix->width;
  
  	if (pix->height > ceu_sub_height)
  		ceu_sub_height = pix->height;
  
  	pix->colorspace = mf.colorspace;
  
  	if (image_mode) {
  		/* Scale pix->{width x height} down to width x height */
  		scale_h		= calc_scale(ceu_sub_width, &pix->width);
  		scale_v		= calc_scale(ceu_sub_height, &pix->height);
  	} else {
  		pix->width	= ceu_sub_width;
  		pix->height	= ceu_sub_height;
  		scale_h		= 0;
  		scale_v		= 0;
  	}
  
  	pcdev->cflcr = scale_h | (scale_v << 16);
  
  	/*
  	 * We have calculated CFLCR, the actual configuration will be performed
  	 * in sh_mobile_ceu_set_bus_param()
  	 */
  
  	dev_geo(dev, "10: W: %u : 0x%x = %u, H: %u : 0x%x = %u\n",
  		ceu_sub_width, scale_h, pix->width,
  		ceu_sub_height, scale_v, pix->height);
  
  	cam->code		= xlate->code;
  	icd->current_fmt	= xlate;
  
  	pcdev->field = field;
  	pcdev->image_mode = image_mode;
  
  	return 0;
  }
  
  static int sh_mobile_ceu_try_fmt(struct soc_camera_device *icd,
  				 struct v4l2_format *f)
  {
  	const struct soc_camera_format_xlate *xlate;
  	struct v4l2_pix_format *pix = &f->fmt.pix;
  	struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
  	struct v4l2_mbus_framefmt mf;
  	__u32 pixfmt = pix->pixelformat;
  	int width, height;
  	int ret;
  
  	dev_geo(icd->dev.parent, "TRY_FMT(pix=0x%x, %ux%u)\n",
  		 pixfmt, pix->width, pix->height);
  
  	xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
  	if (!xlate) {
  		dev_warn(icd->dev.parent, "Format %x not found\n", pixfmt);
  		return -EINVAL;
  	}
  
  
  	v4l_bound_align_image(&pix->width, 2, 2560, 1,
  			      &pix->height, 4, 1920, 2, 0);
  
  	width = pix->width;
  	height = pix->height;
  
  	pix->bytesperline = soc_mbus_bytes_per_line(width, xlate->host_fmt);
  	if ((int)pix->bytesperline < 0)
  		return pix->bytesperline;
  	pix->sizeimage = height * pix->bytesperline;
  
  	/* limit to sensor capabilities */
  	mf.width	= pix->width;
  	mf.height	= pix->height;
  	mf.field	= pix->field;
  	mf.code		= xlate->code;
  	mf.colorspace	= pix->colorspace;
  
  	ret = v4l2_device_call_until_err(sd->v4l2_dev, 0, video, try_mbus_fmt, &mf);
  	if (ret < 0)
  		return ret;
  
  	pix->width	= mf.width;
  	pix->height	= mf.height;
  	pix->field	= mf.field;
  	pix->colorspace	= mf.colorspace;
  
  	switch (pixfmt) {
  	case V4L2_PIX_FMT_NV12:
  	case V4L2_PIX_FMT_NV21:
  	case V4L2_PIX_FMT_NV16:
  	case V4L2_PIX_FMT_NV61:
  		/* We can scale precisely, need a bigger image from camera */
  		if (pix->width < width || pix->height < height) {
  			/*
  			 * We presume, the sensor behaves sanely, i.e., if
  			 * requested a bigger rectangle, it will not return a
  			 * smaller one.
  			 */
  			mf.width = 2560;
  			mf.height = 1920;
  			ret = v4l2_device_call_until_err(sd->v4l2_dev, 0, video,
  							 try_mbus_fmt, &mf);
  			if (ret < 0) {
  				/* Shouldn't actually happen... */
  				dev_err(icd->dev.parent,
  					"FIXME: client try_fmt() = %d\n", ret);
  				return ret;
  			}
  		}
  		/* We will scale exactly */
  		if (mf.width > width)
  			pix->width = width;
  		if (mf.height > height)
  			pix->height = height;
  	}
  
  	dev_geo(icd->dev.parent, "%s(): return %d, fmt 0x%x, %ux%u\n",
  		__func__, ret, pix->pixelformat, pix->width, pix->height);
  
  	return ret;
  }
  
  static int sh_mobile_ceu_reqbufs(struct soc_camera_file *icf,
  				 struct v4l2_requestbuffers *p)
  {
  	int i;
  
  	/*
  	 * This is for locking debugging only. I removed spinlocks and now I
  	 * check whether .prepare is ever called on a linked buffer, or whether
  	 * a dma IRQ can occur for an in-work or unlinked buffer. Until now
  	 * it hadn't triggered
  	 */
  	for (i = 0; i < p->count; i++) {
  		struct sh_mobile_ceu_buffer *buf;
  
  		buf = container_of(icf->vb_vidq.bufs[i],
  				   struct sh_mobile_ceu_buffer, vb);
  		INIT_LIST_HEAD(&buf->vb.queue);
  	}
  
  	return 0;
  }
  
  static unsigned int sh_mobile_ceu_poll(struct file *file, poll_table *pt)
  {
  	struct soc_camera_file *icf = file->private_data;
  	struct sh_mobile_ceu_buffer *buf;
  
  	buf = list_entry(icf->vb_vidq.stream.next,
  			 struct sh_mobile_ceu_buffer, vb.stream);
  
  	poll_wait(file, &buf->vb.done, pt);
  
  	if (buf->vb.state == VIDEOBUF_DONE ||
  	    buf->vb.state == VIDEOBUF_ERROR)
  		return POLLIN|POLLRDNORM;
  
  	return 0;
  }
  
  static int sh_mobile_ceu_querycap(struct soc_camera_host *ici,
  				  struct v4l2_capability *cap)
  {
  	strlcpy(cap->card, "SuperH_Mobile_CEU", sizeof(cap->card));
  	cap->version = KERNEL_VERSION(0, 0, 5);
  	cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
  	return 0;
  }
  
  static void sh_mobile_ceu_init_videobuf(struct videobuf_queue *q,
  					struct soc_camera_device *icd)
  {
  	struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
  	struct sh_mobile_ceu_dev *pcdev = ici->priv;
  
  	videobuf_queue_dma_contig_init(q,
  				       &sh_mobile_ceu_videobuf_ops,
  				       icd->dev.parent, &pcdev->lock,
  				       V4L2_BUF_TYPE_VIDEO_CAPTURE,
  				       pcdev->field,
  				       sizeof(struct sh_mobile_ceu_buffer),
  				       icd);
  }
  
  static int sh_mobile_ceu_get_parm(struct soc_camera_device *icd,
  				  struct v4l2_streamparm *parm)
  {
  	struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
  
  	return v4l2_subdev_call(sd, video, g_parm, parm);
  }
  
  static int sh_mobile_ceu_set_parm(struct soc_camera_device *icd,
  				  struct v4l2_streamparm *parm)
  {
  	struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
  
  	return v4l2_subdev_call(sd, video, s_parm, parm);
  }
  
  static int sh_mobile_ceu_get_ctrl(struct soc_camera_device *icd,
  				  struct v4l2_control *ctrl)
  {
  	struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
  	struct sh_mobile_ceu_dev *pcdev = ici->priv;
  	u32 val;
  
  	switch (ctrl->id) {
  	case V4L2_CID_SHARPNESS:
  		val = ceu_read(pcdev, CLFCR);
  		ctrl->value = val ^ 1;
  		return 0;
  	}
  	return -ENOIOCTLCMD;
  }
  
  static int sh_mobile_ceu_set_ctrl(struct soc_camera_device *icd,
  				  struct v4l2_control *ctrl)
  {
  	struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
  	struct sh_mobile_ceu_dev *pcdev = ici->priv;
  
  	switch (ctrl->id) {
  	case V4L2_CID_SHARPNESS:
  		switch (icd->current_fmt->host_fmt->fourcc) {
  		case V4L2_PIX_FMT_NV12:
  		case V4L2_PIX_FMT_NV21:
  		case V4L2_PIX_FMT_NV16:
  		case V4L2_PIX_FMT_NV61:
  			ceu_write(pcdev, CLFCR, !ctrl->value);
  			return 0;
  		}
  		return -EINVAL;
  	}
  	return -ENOIOCTLCMD;
  }
  
  static const struct v4l2_queryctrl sh_mobile_ceu_controls[] = {
  	{
  		.id		= V4L2_CID_SHARPNESS,
  		.type		= V4L2_CTRL_TYPE_BOOLEAN,
  		.name		= "Low-pass filter",
  		.minimum	= 0,
  		.maximum	= 1,
  		.step		= 1,
  		.default_value	= 0,
  	},
  };
  
  static struct soc_camera_host_ops sh_mobile_ceu_host_ops = {
  	.owner		= THIS_MODULE,
  	.add		= sh_mobile_ceu_add_device,
  	.remove		= sh_mobile_ceu_remove_device,
  	.get_formats	= sh_mobile_ceu_get_formats,
  	.put_formats	= sh_mobile_ceu_put_formats,
  	.get_crop	= sh_mobile_ceu_get_crop,
  	.set_crop	= sh_mobile_ceu_set_crop,
  	.set_fmt	= sh_mobile_ceu_set_fmt,
  	.try_fmt	= sh_mobile_ceu_try_fmt,
  	.set_ctrl	= sh_mobile_ceu_set_ctrl,
  	.get_ctrl	= sh_mobile_ceu_get_ctrl,
  	.set_parm	= sh_mobile_ceu_set_parm,
  	.get_parm	= sh_mobile_ceu_get_parm,
  	.reqbufs	= sh_mobile_ceu_reqbufs,
  	.poll		= sh_mobile_ceu_poll,
  	.querycap	= sh_mobile_ceu_querycap,
  	.set_bus_param	= sh_mobile_ceu_set_bus_param,
  	.init_videobuf	= sh_mobile_ceu_init_videobuf,
  	.controls	= sh_mobile_ceu_controls,
  	.num_controls	= ARRAY_SIZE(sh_mobile_ceu_controls),
  };
  
  struct bus_wait {
  	struct notifier_block	notifier;
  	struct completion	completion;
  	struct device		*dev;
  };
  
  static int bus_notify(struct notifier_block *nb,
  		      unsigned long action, void *data)
  {
  	struct device *dev = data;
  	struct bus_wait *wait = container_of(nb, struct bus_wait, notifier);
  
  	if (wait->dev != dev)
  		return NOTIFY_DONE;
  
  	switch (action) {
  	case BUS_NOTIFY_UNBOUND_DRIVER:
  		/* Protect from module unloading */
  		wait_for_completion(&wait->completion);
  		return NOTIFY_OK;
  	}
  	return NOTIFY_DONE;
  }
  
  static int __devinit sh_mobile_ceu_probe(struct platform_device *pdev)
  {
  	struct sh_mobile_ceu_dev *pcdev;
  	struct resource *res;
  	void __iomem *base;
  	unsigned int irq;
  	int err = 0;
  	struct bus_wait wait = {
  		.completion = COMPLETION_INITIALIZER_ONSTACK(wait.completion),
  		.notifier.notifier_call = bus_notify,
  	};
  	struct device *csi2;
  
  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  	irq = platform_get_irq(pdev, 0);
  	if (!res || (int)irq <= 0) {
  		dev_err(&pdev->dev, "Not enough CEU platform resources.\n");
  		err = -ENODEV;
  		goto exit;
  	}
  
  	pcdev = kzalloc(sizeof(*pcdev), GFP_KERNEL);
  	if (!pcdev) {
  		dev_err(&pdev->dev, "Could not allocate pcdev\n");
  		err = -ENOMEM;
  		goto exit;
  	}
  
  	INIT_LIST_HEAD(&pcdev->capture);
  	spin_lock_init(&pcdev->lock);
  
  	pcdev->pdata = pdev->dev.platform_data;
  	if (!pcdev->pdata) {
  		err = -EINVAL;
  		dev_err(&pdev->dev, "CEU platform data not set.\n");
  		goto exit_kfree;
  	}
  
  	base = ioremap_nocache(res->start, resource_size(res));
  	if (!base) {
  		err = -ENXIO;
  		dev_err(&pdev->dev, "Unable to ioremap CEU registers.\n");
  		goto exit_kfree;
  	}
  
  	pcdev->irq = irq;
  	pcdev->base = base;
  	pcdev->video_limit = 0; /* only enabled if second resource exists */
  
  	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
  	if (res) {
  		err = dma_declare_coherent_memory(&pdev->dev, res->start,
  						  res->start,
  						  resource_size(res),
  						  DMA_MEMORY_MAP |
  						  DMA_MEMORY_EXCLUSIVE);
  		if (!err) {
  			dev_err(&pdev->dev, "Unable to declare CEU memory.\n");
  			err = -ENXIO;
  			goto exit_iounmap;
  		}
  
  		pcdev->video_limit = resource_size(res);
  	}
  
  	/* request irq */
  	err = request_irq(pcdev->irq, sh_mobile_ceu_irq, IRQF_DISABLED,
  			  dev_name(&pdev->dev), pcdev);
  	if (err) {
  		dev_err(&pdev->dev, "Unable to register CEU interrupt.\n");
  		goto exit_release_mem;
  	}
  
  	pm_suspend_ignore_children(&pdev->dev, true);
  	pm_runtime_enable(&pdev->dev);
  	pm_runtime_resume(&pdev->dev);
  
  	pcdev->ici.priv = pcdev;
  	pcdev->ici.v4l2_dev.dev = &pdev->dev;
  	pcdev->ici.nr = pdev->id;
  	pcdev->ici.drv_name = dev_name(&pdev->dev);
  	pcdev->ici.ops = &sh_mobile_ceu_host_ops;
  
  	/* CSI2 interfacing */
  	csi2 = pcdev->pdata->csi2_dev;
  	if (csi2) {
  		wait.dev = csi2;
  
  		err = bus_register_notifier(&platform_bus_type, &wait.notifier);
  		if (err < 0)
  			goto exit_free_clk;
  
  		/*
  		 * From this point the driver module will not unload, until
  		 * we complete the completion.
  		 */
  
  		if (!csi2->driver || !csi2->driver->owner) {
  			complete(&wait.completion);
  			/* Either too late, or probing failed */
  			bus_unregister_notifier(&platform_bus_type, &wait.notifier);
  			err = -ENXIO;
  			goto exit_free_clk;
  		}
  
  		/*
  		 * The module is still loaded, in the worst case it is hanging
  		 * in device release on our completion. So, _now_ dereferencing
  		 * the "owner" is safe!
  		 */
  
  		err = try_module_get(csi2->driver->owner);
  
  		/* Let notifier complete, if it has been locked */
  		complete(&wait.completion);
  		bus_unregister_notifier(&platform_bus_type, &wait.notifier);
  		if (!err) {
  			err = -ENODEV;
  			goto exit_free_clk;
  		}
  	}
  
  	err = soc_camera_host_register(&pcdev->ici);
  	if (err)
  		goto exit_module_put;
  
  	return 0;
  
  exit_module_put:
  	if (csi2 && csi2->driver)
  		module_put(csi2->driver->owner);
  exit_free_clk:
  	pm_runtime_disable(&pdev->dev);
  	free_irq(pcdev->irq, pcdev);
  exit_release_mem:
  	if (platform_get_resource(pdev, IORESOURCE_MEM, 1))
  		dma_release_declared_memory(&pdev->dev);
  exit_iounmap:
  	iounmap(base);
  exit_kfree:
  	kfree(pcdev);
  exit:
  	return err;
  }
  
  static int __devexit sh_mobile_ceu_remove(struct platform_device *pdev)
  {
  	struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev);
  	struct sh_mobile_ceu_dev *pcdev = container_of(soc_host,
  					struct sh_mobile_ceu_dev, ici);
  	struct device *csi2 = pcdev->pdata->csi2_dev;
  
  	soc_camera_host_unregister(soc_host);
  	pm_runtime_disable(&pdev->dev);
  	free_irq(pcdev->irq, pcdev);
  	if (platform_get_resource(pdev, IORESOURCE_MEM, 1))
  		dma_release_declared_memory(&pdev->dev);
  	iounmap(pcdev->base);
  	if (csi2 && csi2->driver)
  		module_put(csi2->driver->owner);
  	kfree(pcdev);
  
  	return 0;
  }
  
  static int sh_mobile_ceu_runtime_nop(struct device *dev)
  {
  	/* Runtime PM callback shared between ->runtime_suspend()
  	 * and ->runtime_resume(). Simply returns success.
  	 *
  	 * This driver re-initializes all registers after
  	 * pm_runtime_get_sync() anyway so there is no need
  	 * to save and restore registers here.
  	 */
  	return 0;
  }
  
  static const struct dev_pm_ops sh_mobile_ceu_dev_pm_ops = {
  	.runtime_suspend = sh_mobile_ceu_runtime_nop,
  	.runtime_resume = sh_mobile_ceu_runtime_nop,
  };
  
  static struct platform_driver sh_mobile_ceu_driver = {
  	.driver 	= {
  		.name	= "sh_mobile_ceu",
  		.pm	= &sh_mobile_ceu_dev_pm_ops,
  	},
  	.probe		= sh_mobile_ceu_probe,
  	.remove		= __devexit_p(sh_mobile_ceu_remove),
  };
  
  static int __init sh_mobile_ceu_init(void)
  {
  	/* Whatever return code */
  	request_module("sh_mobile_csi2");
  	return platform_driver_register(&sh_mobile_ceu_driver);
  }
  
  static void __exit sh_mobile_ceu_exit(void)
  {
  	platform_driver_unregister(&sh_mobile_ceu_driver);
  }
  
  module_init(sh_mobile_ceu_init);
  module_exit(sh_mobile_ceu_exit);
  
  MODULE_DESCRIPTION("SuperH Mobile CEU driver");
  MODULE_AUTHOR("Magnus Damm");
  MODULE_LICENSE("GPL");
  MODULE_ALIAS("platform:sh_mobile_ceu");
  