V4L/DVB (8342): sh_mobile_ceu_camera: Add SuperH Mobile CEU driver V3

This is V3 of the SuperH Mobile CEU soc_camera driver.

The CEU hardware block is configured in a transparent data fetch
mode, frames are captured from the attached camera and written to
physically contiguous memory buffers provided by the newly added
videobuf-dma-contig queue. Tested on sh7722 and sh7723 processors.

 Changes since V2:
 - remove SUPERH Kconfig dependency
 - move sh_mobile_ceu.h to include/media
 - add board callback support with enable_camera()/disable_camera()
 - add support for declare_coherent_memory
 - rework video memory limit
 - more verbose error messages

 Changes since V1:
 - fixed the CEU driver to work with the newly updated patches

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@pengutronix.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

3 files changed, 666 insertions, 0 deletions

diff --git a/drivers/media/video/Kconfig b/drivers/media/video/Kconfig
index 9a4265e5cd8..fdeaff257ca 100644
--- a/drivers/media/video/Kconfig
+++ b/drivers/media/video/Kconfig
@@ -969,4 +969,12 @@ config VIDEO_PXA27x
 	---help---
 	  This is a v4l2 driver for the PXA27x Quick Capture Interface
 
+config VIDEO_SH_MOBILE_CEU
+	tristate "SuperH Mobile CEU Interface driver"
+	depends on VIDEO_DEV
+	select SOC_CAMERA
+	select VIDEOBUF_DMA_CONTIG
+	---help---
+	  This is a v4l2 driver for the SuperH Mobile CEU Interface
+
 endif # VIDEO_CAPTURE_DRIVERS
diff --git a/drivers/media/video/Makefile b/drivers/media/video/Makefile
index 3106eaa893d..6dd51b01ef9 100644
--- a/drivers/media/video/Makefile
+++ b/drivers/media/video/Makefile
@@ -133,6 +133,7 @@ obj-$(CONFIG_VIDEO_VIVI) += vivi.o
 obj-$(CONFIG_VIDEO_CX23885) += cx23885/
 
 obj-$(CONFIG_VIDEO_PXA27x)	+= pxa_camera.o
+obj-$(CONFIG_VIDEO_SH_MOBILE_CEU)	+= sh_mobile_ceu_camera.o
 obj-$(CONFIG_SOC_CAMERA)	+= soc_camera.o
 obj-$(CONFIG_SOC_CAMERA_MT9M001)	+= mt9m001.o
 obj-$(CONFIG_SOC_CAMERA_MT9V022)	+= mt9v022.o
diff --git a/drivers/media/video/sh_mobile_ceu_camera.c b/drivers/media/video/sh_mobile_ceu_camera.c
new file mode 100644
index 00000000000..6560ff49698
--- /dev/null
+++ b/drivers/media/video/sh_mobile_ceu_camera.c
@@ -0,0 +1,657 @@
+/*
+ * 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/device.h>
+#include <linux/platform_device.h>
+#include <linux/mutex.h>
+#include <linux/videodev2.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>
+
+/* register offsets for sh7722 / sh7723 */
+
+#define CAPSR  0x00
+#define CAPCR  0x04
+#define CAMCR  0x08
+#define CMCYR  0x0c
+#define CAMOR  0x10
+#define CAPWR  0x14
+#define CAIFR  0x18
+#define CSTCR  0x20 /* not on sh7723 */
+#define CSECR  0x24 /* not on sh7723 */
+#define CRCNTR 0x28
+#define CRCMPR 0x2c
+#define CFLCR  0x30
+#define CFSZR  0x34
+#define CDWDR  0x38
+#define CDAYR  0x3c
+#define CDACR  0x40
+#define CDBYR  0x44
+#define CDBCR  0x48
+#define CBDSR  0x4c
+#define CFWCR  0x5c
+#define CLFCR  0x60
+#define CDOCR  0x64
+#define CDDCR  0x68
+#define CDDAR  0x6c
+#define CEIER  0x70
+#define CETCR  0x74
+#define CSTSR  0x7c
+#define CSRTR  0x80
+#define CDSSR  0x84
+#define CDAYR2 0x90
+#define CDACR2 0x94
+#define CDBYR2 0x98
+#define CDBCR2 0x9c
+
+static DEFINE_MUTEX(camera_lock);
+
+/* per video frame buffer */
+struct sh_mobile_ceu_buffer {
+	struct videobuf_buffer vb; /* v4l buffer must be first */
+	const struct soc_camera_data_format *fmt;
+};
+
+struct sh_mobile_ceu_dev {
+	struct device *dev;
+	struct soc_camera_host ici;
+	struct soc_camera_device *icd;
+
+	unsigned int irq;
+	void __iomem *base;
+	unsigned long video_limit;
+
+	spinlock_t lock;
+	struct list_head capture;
+	struct videobuf_buffer *active;
+
+	struct sh_mobile_ceu_info *pdata;
+};
+
+static void ceu_write(struct sh_mobile_ceu_dev *priv,
+		      unsigned long reg_offs, unsigned long data)
+{
+	iowrite32(data, priv->base + reg_offs);
+}
+
+static unsigned long ceu_read(struct sh_mobile_ceu_dev *priv,
+			      unsigned long reg_offs)
+{
+	return ioread32(priv->base + reg_offs);
+}
+
+/*
+ *  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_pixel = (icd->current_fmt->depth + 7) >> 3;
+
+	*size = PAGE_ALIGN(icd->width * icd->height * bytes_per_pixel);
+
+	if (0 == *count)
+		*count = 2;
+
+	if (pcdev->video_limit) {
+		while (*size * *count > pcdev->video_limit)
+			(*count)--;
+	}
+
+	dev_dbg(&icd->dev, "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;
+
+	dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
+		&buf->vb, buf->vb.baddr, buf->vb.bsize);
+
+	if (in_interrupt())
+		BUG();
+
+	videobuf_dma_contig_free(vq, &buf->vb);
+	dev_dbg(&icd->dev, "%s freed\n", __func__);
+	buf->vb.state = VIDEOBUF_NEEDS_INIT;
+}
+
+static void sh_mobile_ceu_capture(struct sh_mobile_ceu_dev *pcdev)
+{
+	ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) & ~1);
+	ceu_write(pcdev, CETCR, ~ceu_read(pcdev, CETCR) & 0x0317f313);
+	ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) | 1);
+
+	ceu_write(pcdev, CAPCR, ceu_read(pcdev, CAPCR) & ~0x10000);
+
+	ceu_write(pcdev, CETCR, 0x0317f313 ^ 0x10);
+
+	if (pcdev->active) {
+		ceu_write(pcdev, CDAYR, videobuf_to_dma_contig(pcdev->active));
+		ceu_write(pcdev, CAPSR, 0x1); /* start capture */
+	}
+}
+
+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 ret;
+
+	buf = container_of(vb, struct sh_mobile_ceu_buffer, vb);
+
+	dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %d\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->fmt	!= icd->current_fmt ||
+	    vb->width	!= icd->width ||
+	    vb->height	!= icd->height ||
+	    vb->field	!= field) {
+		buf->fmt	= icd->current_fmt;
+		vb->width	= icd->width;
+		vb->height	= icd->height;
+		vb->field	= field;
+		vb->state	= VIDEOBUF_NEEDS_INIT;
+	}
+
+	vb->size = vb->width * vb->height * ((buf->fmt->depth + 7) >> 3);
+	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;
+}
+
+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;
+	unsigned long flags;
+
+	dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
+		vb, vb->baddr, vb->bsize);
+
+	vb->state = VIDEOBUF_ACTIVE;
+	spin_lock_irqsave(&pcdev->lock, flags);
+	list_add_tail(&vb->queue, &pcdev->capture);
+
+	if (!pcdev->active) {
+		pcdev->active = vb;
+		sh_mobile_ceu_capture(pcdev);
+	}
+
+	spin_unlock_irqrestore(&pcdev->lock, flags);
+}
+
+static void sh_mobile_ceu_videobuf_release(struct videobuf_queue *vq,
+					   struct videobuf_buffer *vb)
+{
+	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;
+	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;
+
+	sh_mobile_ceu_capture(pcdev);
+
+	vb->state = VIDEOBUF_DONE;
+	do_gettimeofday(&vb->ts);
+	vb->field_count++;
+	wake_up(&vb->done);
+	spin_unlock_irqrestore(&pcdev->lock, flags);
+
+	return IRQ_HANDLED;
+}
+
+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 = -EBUSY;
+
+	mutex_lock(&camera_lock);
+
+	if (pcdev->icd)
+		goto err;
+
+	dev_info(&icd->dev,
+		 "SuperH Mobile CEU driver attached to camera %d\n",
+		 icd->devnum);
+
+	if (pcdev->pdata->enable_camera)
+		pcdev->pdata->enable_camera();
+
+	ret = icd->ops->init(icd);
+	if (ret)
+		goto err;
+
+	ceu_write(pcdev, CAPSR, 1 << 16); /* reset */
+	while (ceu_read(pcdev, CSTSR) & 1)
+		msleep(1);
+
+	pcdev->icd = icd;
+err:
+	mutex_unlock(&camera_lock);
+
+	return ret;
+}
+
+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;
+
+	BUG_ON(icd != pcdev->icd);
+
+	/* disable capture, disable interrupts */
+	ceu_write(pcdev, CEIER, 0);
+	ceu_write(pcdev, CAPSR, 1 << 16); /* reset */
+	icd->ops->release(icd);
+	if (pcdev->pdata->disable_camera)
+		pcdev->pdata->disable_camera();
+
+	dev_info(&icd->dev,
+		 "SuperH Mobile CEU driver detached from camera %d\n",
+		 icd->devnum);
+
+	pcdev->icd = NULL;
+}
+
+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, buswidth, width, cfszr_width, cdwdr_width;
+	unsigned long camera_flags, common_flags, value;
+
+	camera_flags = icd->ops->query_bus_param(icd);
+	common_flags = soc_camera_bus_param_compatible(camera_flags,
+						       pcdev->pdata->flags);
+	if (!common_flags)
+		return -EINVAL;
+
+	ret = icd->ops->set_bus_param(icd, common_flags);
+	if (ret < 0)
+		return ret;
+
+	switch (common_flags & SOCAM_DATAWIDTH_MASK) {
+	case SOCAM_DATAWIDTH_8:
+		buswidth = 8;
+		break;
+	case SOCAM_DATAWIDTH_16:
+		buswidth = 16;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	ceu_write(pcdev, CRCNTR, 0);
+	ceu_write(pcdev, CRCMPR, 0);
+
+	value = 0x00000010;
+	value |= (common_flags & SOCAM_VSYNC_ACTIVE_LOW) ? (1 << 1) : 0;
+	value |= (common_flags & SOCAM_HSYNC_ACTIVE_LOW) ? (1 << 0) : 0;
+	value |= (buswidth == 16) ? (1 << 12) : 0;
+	ceu_write(pcdev, CAMCR, value);
+
+	ceu_write(pcdev, CAPCR, 0x00300000);
+	ceu_write(pcdev, CAIFR, 0);
+
+	mdelay(1);
+
+	width = icd->width * (icd->current_fmt->depth / 8);
+	width = (buswidth == 16) ? width / 2 : width;
+	cfszr_width = (buswidth == 8) ? width / 2 : width;
+	cdwdr_width = (buswidth == 16) ? width * 2 : width;
+
+	ceu_write(pcdev, CAMOR, 0);
+	ceu_write(pcdev, CAPWR, (icd->height << 16) | width);
+	ceu_write(pcdev, CFLCR, 0); /* data fetch mode - no scaling */
+	ceu_write(pcdev, CFSZR, (icd->height << 16) | cfszr_width);
+	ceu_write(pcdev, CLFCR, 0); /* data fetch mode - no lowpass filter */
+	ceu_write(pcdev, CDOCR, 0x00000016);
+
+	ceu_write(pcdev, CDWDR, cdwdr_width);
+	ceu_write(pcdev, CFWCR, 0); /* keep "datafetch firewall" disabled */
+
+	/* not in bundle mode: skip CBDSR, CDAYR2, CDACR2, CDBYR2, CDBCR2 */
+	/* in data fetch mode: no need for CDACR, CDBYR, CDBCR */
+
+	return 0;
+}
+
+static int sh_mobile_ceu_try_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;
+	unsigned long camera_flags, common_flags;
+
+	camera_flags = icd->ops->query_bus_param(icd);
+	common_flags = soc_camera_bus_param_compatible(camera_flags,
+						       pcdev->pdata->flags);
+	if (!common_flags)
+		return -EINVAL;
+
+	return 0;
+}
+
+static int sh_mobile_ceu_set_fmt_cap(struct soc_camera_device *icd,
+				     __u32 pixfmt, struct v4l2_rect *rect)
+{
+	return icd->ops->set_fmt_cap(icd, pixfmt, rect);
+}
+
+static int sh_mobile_ceu_try_fmt_cap(struct soc_camera_device *icd,
+				     struct v4l2_format *f)
+{
+	/* FIXME: calculate using depth and bus width */
+
+	if (f->fmt.pix.height < 4)
+		f->fmt.pix.height = 4;
+	if (f->fmt.pix.height > 1920)
+		f->fmt.pix.height = 1920;
+	if (f->fmt.pix.width < 2)
+		f->fmt.pix.width = 2;
+	if (f->fmt.pix.width > 2560)
+		f->fmt.pix.width = 2560;
+	f->fmt.pix.width &= ~0x01;
+	f->fmt.pix.height &= ~0x03;
+
+	/* limit to sensor capabilities */
+	return icd->ops->try_fmt_cap(icd, f);
+}
+
+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,
+				       &ici->dev, &pcdev->lock,
+				       V4L2_BUF_TYPE_VIDEO_CAPTURE,
+				       V4L2_FIELD_NONE,
+				       sizeof(struct sh_mobile_ceu_buffer),
+				       icd);
+}
+
+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,
+	.set_fmt_cap	= sh_mobile_ceu_set_fmt_cap,
+	.try_fmt_cap	= sh_mobile_ceu_try_fmt_cap,
+	.reqbufs	= sh_mobile_ceu_reqbufs,
+	.poll		= sh_mobile_ceu_poll,
+	.querycap	= sh_mobile_ceu_querycap,
+	.try_bus_param	= sh_mobile_ceu_try_bus_param,
+	.set_bus_param	= sh_mobile_ceu_set_bus_param,
+	.init_videobuf	= sh_mobile_ceu_init_videobuf,
+};
+
+static int 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;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	irq = platform_get_irq(pdev, 0);
+	if (!res || !irq) {
+		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;
+	}
+
+	platform_set_drvdata(pdev, pcdev);
+	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, res->end - res->start + 1);
+	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 */
+	pcdev->dev = &pdev->dev;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	if (res) {
+		err = dma_declare_coherent_memory(&pdev->dev, res->start,
+						  res->start,
+						  (res->end - res->start) + 1,
+						  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 = (res->end - res->start) + 1;
+	}
+
+	/* request irq */
+	err = request_irq(pcdev->irq, sh_mobile_ceu_irq, IRQF_DISABLED,
+			  pdev->dev.bus_id, pcdev);
+	if (err) {
+		dev_err(&pdev->dev, "Unable to register CEU interrupt.\n");
+		goto exit_release_mem;
+	}
+
+	pcdev->ici.priv = pcdev;
+	pcdev->ici.dev.parent = &pdev->dev;
+	pcdev->ici.nr = pdev->id;
+	pcdev->ici.drv_name = pdev->dev.bus_id,
+	pcdev->ici.ops = &sh_mobile_ceu_host_ops,
+
+	err = soc_camera_host_register(&pcdev->ici);
+	if (err)
+		goto exit_free_irq;
+
+	return 0;
+
+exit_free_irq:
+	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 sh_mobile_ceu_remove(struct platform_device *pdev)
+{
+	struct sh_mobile_ceu_dev *pcdev = platform_get_drvdata(pdev);
+
+	soc_camera_host_unregister(&pcdev->ici);
+	free_irq(pcdev->irq, pcdev);
+	if (platform_get_resource(pdev, IORESOURCE_MEM, 1))
+		dma_release_declared_memory(&pdev->dev);
+	iounmap(pcdev->base);
+	kfree(pcdev);
+	return 0;
+}
+
+static struct platform_driver sh_mobile_ceu_driver = {
+	.driver 	= {
+		.name	= "sh_mobile_ceu",
+	},
+	.probe		= sh_mobile_ceu_probe,
+	.remove		= sh_mobile_ceu_remove,
+};
+
+static int __init sh_mobile_ceu_init(void)
+{
+	return platform_driver_register(&sh_mobile_ceu_driver);
+}
+
+static void __exit sh_mobile_ceu_exit(void)
+{
+	return 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");