Added missing tegra files.HEADmaster

1 files changed, 2220 insertions, 0 deletions

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..e54089802b6
--- /dev/null
+++ b/drivers/media/video/sh_mobile_ceu_camera.c
@@ -0,0 +1,2220 @@
+/*
+ * 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/completion.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/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/sh_mobile_csi2.h>
+#include <media/videobuf2-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 vb2_buffer vb; /* v4l buffer must be first */
+        struct list_head queue;
+        enum v4l2_mbus_pixelcode code;
+};
+
+struct sh_mobile_ceu_dev {
+        struct soc_camera_host ici;
+        struct soc_camera_device *icd;
+        struct platform_device *csi2_pdev;
+
+        unsigned int irq;
+        void __iomem *base;
+        unsigned long video_limit;
+
+        spinlock_t lock;                /* Protects video buffer lists */
+        struct list_head capture;
+        struct vb2_buffer *active;
+        struct vb2_alloc_ctx *alloc_ctx;
+
+        struct sh_mobile_ceu_info *pdata;
+        struct completion complete;
+
+        u32 cflcr;
+
+        enum v4l2_field field;
+        int sequence;
+
+        unsigned int image_mode:1;
+        unsigned int is_16bit:1;
+        unsigned int frozen: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 struct sh_mobile_ceu_buffer *to_ceu_vb(struct vb2_buffer *vb)
+{
+        return container_of(vb, struct sh_mobile_ceu_buffer, vb);
+}
+
+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->pdev, "soft reset time out\n");
+                return -EIO;
+        }
+
+        return 0;
+}
+
+/*
+ *  Videobuf operations
+ */
+static int sh_mobile_ceu_videobuf_setup(struct vb2_queue *vq,
+                        unsigned int *count, unsigned int *num_planes,
+                        unsigned long sizes[], void *alloc_ctxs[])
+{
+        struct soc_camera_device *icd = container_of(vq, struct soc_camera_device, vb2_vidq);
+        struct soc_camera_host *ici = to_soc_camera_host(icd->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;
+
+        *num_planes = 1;
+
+        pcdev->sequence = 0;
+        sizes[0] = bytes_per_line * icd->user_height;
+        alloc_ctxs[0] = pcdev->alloc_ctx;
+
+        if (!*count)
+                *count = 2;
+
+        if (pcdev->video_limit) {
+                if (PAGE_ALIGN(sizes[0]) * *count > pcdev->video_limit)
+                        *count = pcdev->video_limit / PAGE_ALIGN(sizes[0]);
+        }
+
+        dev_dbg(icd->parent, "count=%d, size=%lu\n", *count, sizes[0]);
+
+        return 0;
+}
+
+#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);
+        if (!pcdev->frozen)
+                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->frozen) {
+                complete(&pcdev->complete);
+                return ret;
+        }
+
+        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 = vb2_dma_contig_plane_paddr(pcdev->active, 0);
+
+        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);
+                }
+        }
+
+        ceu_write(pcdev, CAPSR, 0x1); /* start capture */
+
+        return ret;
+}
+
+static int sh_mobile_ceu_videobuf_prepare(struct vb2_buffer *vb)
+{
+        struct soc_camera_device *icd = container_of(vb->vb2_queue, struct soc_camera_device, vb2_vidq);
+        struct sh_mobile_ceu_buffer *buf;
+        int bytes_per_line = soc_mbus_bytes_per_line(icd->user_width,
+                                                icd->current_fmt->host_fmt);
+        unsigned long size;
+
+        if (bytes_per_line < 0)
+                return bytes_per_line;
+
+        buf = to_ceu_vb(vb);
+
+        dev_dbg(icd->parent, "%s (vb=0x%p) 0x%p %lu\n", __func__,
+                vb, vb2_plane_vaddr(vb, 0), vb2_get_plane_payload(vb, 0));
+
+        /* Added list head initialization on alloc */
+        WARN(!list_empty(&buf->queue), "Buffer %p on queue!\n", vb);
+
+#ifdef DEBUG
+        /*
+         * This can be useful if you want to see if we actually fill
+         * the buffer with something
+         */
+        if (vb2_plane_vaddr(vb, 0))
+                memset(vb2_plane_vaddr(vb, 0), 0xaa, vb2_get_plane_payload(vb, 0));
+#endif
+
+        BUG_ON(NULL == icd->current_fmt);
+
+        size = icd->user_height * bytes_per_line;
+
+        if (vb2_plane_size(vb, 0) < size) {
+                dev_err(icd->parent, "Buffer too small (%lu < %lu)\n",
+                        vb2_plane_size(vb, 0), size);
+                return -ENOBUFS;
+        }
+
+        vb2_set_plane_payload(vb, 0, size);
+
+        return 0;
+}
+
+static void sh_mobile_ceu_videobuf_queue(struct vb2_buffer *vb)
+{
+        struct soc_camera_device *icd = container_of(vb->vb2_queue, struct soc_camera_device, vb2_vidq);
+        struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
+        struct sh_mobile_ceu_dev *pcdev = ici->priv;
+        struct sh_mobile_ceu_buffer *buf = to_ceu_vb(vb);
+
+        dev_dbg(icd->parent, "%s (vb=0x%p) 0x%p %lu\n", __func__,
+                vb, vb2_plane_vaddr(vb, 0), vb2_get_plane_payload(vb, 0));
+
+        spin_lock_irq(&pcdev->lock);
+        list_add_tail(&buf->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);
+        }
+        spin_unlock_irq(&pcdev->lock);
+}
+
+static void sh_mobile_ceu_videobuf_release(struct vb2_buffer *vb)
+{
+        struct soc_camera_device *icd = container_of(vb->vb2_queue, struct soc_camera_device, vb2_vidq);
+        struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
+        struct sh_mobile_ceu_buffer *buf = to_ceu_vb(vb);
+        struct sh_mobile_ceu_dev *pcdev = ici->priv;
+
+        spin_lock_irq(&pcdev->lock);
+
+        if (pcdev->active == vb) {
+                /* disable capture (release DMA buffer), reset */
+                ceu_write(pcdev, CAPSR, 1 << 16);
+                pcdev->active = NULL;
+        }
+
+        /*
+         * Doesn't hurt also if the list is empty, but it hurts, if queuing the
+         * buffer failed, and .buf_init() hasn't been called
+         */
+        if (buf->queue.next)
+                list_del_init(&buf->queue);
+
+        spin_unlock_irq(&pcdev->lock);
+}
+
+static int sh_mobile_ceu_videobuf_init(struct vb2_buffer *vb)
+{
+        /* This is for locking debugging only */
+        INIT_LIST_HEAD(&to_ceu_vb(vb)->queue);
+        return 0;
+}
+
+static int sh_mobile_ceu_stop_streaming(struct vb2_queue *q)
+{
+        struct soc_camera_device *icd = container_of(q, struct soc_camera_device, vb2_vidq);
+        struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
+        struct sh_mobile_ceu_dev *pcdev = ici->priv;
+        struct list_head *buf_head, *tmp;
+
+        spin_lock_irq(&pcdev->lock);
+
+        pcdev->active = NULL;
+
+        list_for_each_safe(buf_head, tmp, &pcdev->capture)
+                list_del_init(buf_head);
+
+        spin_unlock_irq(&pcdev->lock);
+
+        return sh_mobile_ceu_soft_reset(pcdev);
+}
+
+static struct vb2_ops sh_mobile_ceu_videobuf_ops = {
+        .queue_setup    = sh_mobile_ceu_videobuf_setup,
+        .buf_prepare    = sh_mobile_ceu_videobuf_prepare,
+        .buf_queue      = sh_mobile_ceu_videobuf_queue,
+        .buf_cleanup    = sh_mobile_ceu_videobuf_release,
+        .buf_init       = sh_mobile_ceu_videobuf_init,
+        .wait_prepare   = soc_camera_unlock,
+        .wait_finish    = soc_camera_lock,
+        .stop_streaming = sh_mobile_ceu_stop_streaming,
+};
+
+static irqreturn_t sh_mobile_ceu_irq(int irq, void *data)
+{
+        struct sh_mobile_ceu_dev *pcdev = data;
+        struct vb2_buffer *vb;
+        int ret;
+
+        spin_lock(&pcdev->lock);
+
+        vb = pcdev->active;
+        if (!vb)
+                /* Stale interrupt from a released buffer */
+                goto out;
+
+        list_del_init(&to_ceu_vb(vb)->queue);
+
+        if (!list_empty(&pcdev->capture))
+                pcdev->active = &list_entry(pcdev->capture.next,
+                                            struct sh_mobile_ceu_buffer, queue)->vb;
+        else
+                pcdev->active = NULL;
+
+        ret = sh_mobile_ceu_capture(pcdev);
+        do_gettimeofday(&vb->v4l2_buf.timestamp);
+        if (!ret) {
+                vb->v4l2_buf.field = pcdev->field;
+                vb->v4l2_buf.sequence = pcdev->sequence++;
+        }
+        vb2_buffer_done(vb, ret < 0 ? VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
+
+out:
+        spin_unlock(&pcdev->lock);
+
+        return IRQ_HANDLED;
+}
+
+static struct v4l2_subdev *find_csi2(struct sh_mobile_ceu_dev *pcdev)
+{
+        struct v4l2_subdev *sd;
+
+        if (!pcdev->csi2_pdev)
+                return NULL;
+
+        v4l2_device_for_each_subdev(sd, &pcdev->ici.v4l2_dev)
+                if (&pcdev->csi2_pdev->dev == v4l2_get_subdevdata(sd))
+                        return sd;
+
+        return NULL;
+}
+
+/* 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->parent);
+        struct sh_mobile_ceu_dev *pcdev = ici->priv;
+        struct v4l2_subdev *csi2_sd;
+        int ret;
+
+        if (pcdev->icd)
+                return -EBUSY;
+
+        dev_info(icd->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);
+
+        csi2_sd = find_csi2(pcdev);
+
+        ret = v4l2_subdev_call(csi2_sd, core, s_power, 1);
+        if (ret != -ENODEV && ret != -ENOIOCTLCMD && ret < 0) {
+                pm_runtime_put_sync(ici->v4l2_dev.dev);
+        } else {
+                pcdev->icd = icd;
+                ret = 0;
+        }
+
+        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->parent);
+        struct sh_mobile_ceu_dev *pcdev = ici->priv;
+        struct v4l2_subdev *csi2_sd = find_csi2(pcdev);
+
+        BUG_ON(icd != pcdev->icd);
+
+        v4l2_subdev_call(csi2_sd, core, s_power, 0);
+        /* disable capture, disable interrupts */
+        ceu_write(pcdev, CEIER, 0);
+        sh_mobile_ceu_soft_reset(pcdev);
+
+        /* make sure active buffer is canceled */
+        spin_lock_irq(&pcdev->lock);
+        if (pcdev->active) {
+                list_del_init(&to_ceu_vb(pcdev->active)->queue);
+                vb2_buffer_done(pcdev->active, VB2_BUF_STATE_ERROR);
+                pcdev->active = NULL;
+        }
+        spin_unlock_irq(&pcdev->lock);
+
+        pm_runtime_put_sync(ici->v4l2_dev.dev);
+
+        dev_info(icd->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->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->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) {
+                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->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);
+}
+
+/* Capture is not running, no interrupts, no locking needed */
+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->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)
+                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->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->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->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->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_warn(dev, "unsupported format code #%u: %d\n", idx, code);
+                return 0;
+        }
+
+        if (!pcdev->pdata->csi2) {
+                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;
+
+                /* FIXME: subwindow is lost between close / open */
+
+                /* 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, (long)icd, 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->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, (long)icd, 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, (long)icd, 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->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_ceu_camera.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 device *dev = icd->parent;
+        struct soc_camera_host *ici = to_soc_camera_host(dev);
+        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 v4l2_mbus_framefmt mf;
+        unsigned int scale_cam_h, scale_cam_v, scale_ceu_h, scale_ceu_v,
+                out_width, out_height;
+        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;
+
+        /* 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 (interm_width < icd->user_width) {
+                u32 new_scale_h;
+
+                new_scale_h = calc_generic_scale(rect->width, icd->user_width);
+
+                mf.width = scale_down(cam_rect->width, new_scale_h);
+        }
+
+        if (interm_height < icd->user_height) {
+                u32 new_scale_v;
+
+                new_scale_v = calc_generic_scale(rect->height, icd->user_height);
+
+                mf.height = scale_down(cam_rect->height, new_scale_v);
+        }
+
+        if (interm_width < icd->user_width || interm_height < icd->user_height) {
+                ret = v4l2_device_call_until_err(sd->v4l2_dev, (int)icd, video,
+                                                 s_mbus_fmt, &mf);
+                if (ret < 0)
+                        return ret;
+
+                dev_geo(dev, "New camera output %ux%u\n", mf.width, mf.height);
+                scale_cam_h     = calc_generic_scale(cam_rect->width, mf.width);
+                scale_cam_v     = calc_generic_scale(cam_rect->height, mf.height);
+                interm_width    = scale_down(rect->width, scale_cam_h);
+                interm_height   = scale_down(rect->height, scale_cam_v);
+        }
+
+        /* Cache camera output window */
+        cam->width      = mf.width;
+        cam->height     = mf.height;
+
+        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);
+
+        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_cam_h) & ~1;
+        cam->ceu_top     = scale_down(rect->top - cam_rect->top, scale_cam_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. The CE bit can be cleared by the hardware */
+        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->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 device *dev = icd->parent;
+        struct soc_camera_host *ici = to_soc_camera_host(dev);
+        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;
+        __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->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->parent, "Format %x not found\n", pixfmt);
+                return -EINVAL;
+        }
+
+        /* FIXME: calculate using depth and bus width */
+
+        v4l_bound_align_image(&pix->width, 2, 2560, 1,
+                              &pix->height, 4, 1920, 2, 0);
+
+        width = pix->width;
+        height = pix->height;
+
+        /* 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, (long)icd, 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:
+                /* FIXME: check against rect_max after converting soc-camera */
+                /* 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, (long)icd, video,
+                                                         try_mbus_fmt, &mf);
+                        if (ret < 0) {
+                                /* Shouldn't actually happen... */
+                                dev_err(icd->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->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_set_livecrop(struct soc_camera_device *icd,
+                                      struct v4l2_crop *a)
+{
+        struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
+        struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
+        struct sh_mobile_ceu_dev *pcdev = ici->priv;
+        u32 out_width = icd->user_width, out_height = icd->user_height;
+        int ret;
+
+        /* Freeze queue */
+        pcdev->frozen = 1;
+        /* Wait for frame */
+        ret = wait_for_completion_interruptible(&pcdev->complete);
+        /* Stop the client */
+        ret = v4l2_subdev_call(sd, video, s_stream, 0);
+        if (ret < 0)
+                dev_warn(icd->parent,
+                         "Client failed to stop the stream: %d\n", ret);
+        else
+                /* Do the crop, if it fails, there's nothing more we can do */
+                sh_mobile_ceu_set_crop(icd, a);
+
+        dev_geo(icd->parent, "Output after crop: %ux%u\n", icd->user_width, icd->user_height);
+
+        if (icd->user_width != out_width || icd->user_height != out_height) {
+                struct v4l2_format f = {
+                        .type   = V4L2_BUF_TYPE_VIDEO_CAPTURE,
+                        .fmt.pix        = {
+                                .width          = out_width,
+                                .height         = out_height,
+                                .pixelformat    = icd->current_fmt->host_fmt->fourcc,
+                                .field          = pcdev->field,
+                                .colorspace     = icd->colorspace,
+                        },
+                };
+                ret = sh_mobile_ceu_set_fmt(icd, &f);
+                if (!ret && (out_width != f.fmt.pix.width ||
+                             out_height != f.fmt.pix.height))
+                        ret = -EINVAL;
+                if (!ret) {
+                        icd->user_width         = out_width;
+                        icd->user_height        = out_height;
+                        ret = sh_mobile_ceu_set_bus_param(icd,
+                                        icd->current_fmt->host_fmt->fourcc);
+                }
+        }
+
+        /* Thaw the queue */
+        pcdev->frozen = 0;
+        spin_lock_irq(&pcdev->lock);
+        sh_mobile_ceu_capture(pcdev);
+        spin_unlock_irq(&pcdev->lock);
+        /* Start the client */
+        ret = v4l2_subdev_call(sd, video, s_stream, 1);
+        return ret;
+}
+
+static unsigned int sh_mobile_ceu_poll(struct file *file, poll_table *pt)
+{
+        struct soc_camera_device *icd = file->private_data;
+
+        return vb2_poll(&icd->vb2_vidq, file, pt);
+}
+
+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->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
+        return 0;
+}
+
+static int sh_mobile_ceu_init_videobuf(struct vb2_queue *q,
+                                       struct soc_camera_device *icd)
+{
+        q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+        q->io_modes = VB2_MMAP | VB2_USERPTR;
+        q->drv_priv = icd;
+        q->ops = &sh_mobile_ceu_videobuf_ops;
+        q->mem_ops = &vb2_dma_contig_memops;
+        q->buf_struct_size = sizeof(struct sh_mobile_ceu_buffer);
+
+        return vb2_queue_init(q);
+}
+
+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->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->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_livecrop   = sh_mobile_ceu_set_livecrop,
+        .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,
+        .poll           = sh_mobile_ceu_poll,
+        .querycap       = sh_mobile_ceu_querycap,
+        .set_bus_param  = sh_mobile_ceu_set_bus_param,
+        .init_videobuf2 = 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 sh_mobile_ceu_companion *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);
+        init_completion(&pcdev->complete);
+
+        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;
+
+        pcdev->alloc_ctx = vb2_dma_contig_init_ctx(&pdev->dev);
+        if (IS_ERR(pcdev->alloc_ctx)) {
+                err = PTR_ERR(pcdev->alloc_ctx);
+                goto exit_free_clk;
+        }
+
+        err = soc_camera_host_register(&pcdev->ici);
+        if (err)
+                goto exit_free_ctx;
+
+        /* CSI2 interfacing */
+        csi2 = pcdev->pdata->csi2;
+        if (csi2) {
+                struct platform_device *csi2_pdev =
+                        platform_device_alloc("sh-mobile-csi2", csi2->id);
+                struct sh_csi2_pdata *csi2_pdata = csi2->platform_data;
+
+                if (!csi2_pdev) {
+                        err = -ENOMEM;
+                        goto exit_host_unregister;
+                }
+
+                pcdev->csi2_pdev                = csi2_pdev;
+
+                err = platform_device_add_data(csi2_pdev, csi2_pdata, sizeof(*csi2_pdata));
+                if (err < 0)
+                        goto exit_pdev_put;
+
+                csi2_pdata                      = csi2_pdev->dev.platform_data;
+                csi2_pdata->v4l2_dev            = &pcdev->ici.v4l2_dev;
+
+                csi2_pdev->resource             = csi2->resource;
+                csi2_pdev->num_resources        = csi2->num_resources;
+
+                err = platform_device_add(csi2_pdev);
+                if (err < 0)
+                        goto exit_pdev_put;
+
+                wait.dev = &csi2_pdev->dev;
+
+                err = bus_register_notifier(&platform_bus_type, &wait.notifier);
+                if (err < 0)
+                        goto exit_pdev_unregister;
+
+                /*
+                 * From this point the driver module will not unload, until
+                 * we complete the completion.
+                 */
+
+                if (!csi2_pdev->dev.driver) {
+                        complete(&wait.completion);
+                        /* Either too late, or probing failed */
+                        bus_unregister_notifier(&platform_bus_type, &wait.notifier);
+                        err = -ENXIO;
+                        goto exit_pdev_unregister;
+                }
+
+                /*
+                 * 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_pdev->dev.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_pdev_unregister;
+                }
+        }
+
+        return 0;
+
+exit_pdev_unregister:
+        platform_device_del(pcdev->csi2_pdev);
+exit_pdev_put:
+        pcdev->csi2_pdev->resource = NULL;
+        platform_device_put(pcdev->csi2_pdev);
+exit_host_unregister:
+        soc_camera_host_unregister(&pcdev->ici);
+exit_free_ctx:
+        vb2_dma_contig_cleanup_ctx(pcdev->alloc_ctx);
+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 platform_device *csi2_pdev = pcdev->csi2_pdev;
+
+        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);
+        vb2_dma_contig_cleanup_ctx(pcdev->alloc_ctx);
+        if (csi2_pdev && csi2_pdev->dev.driver) {
+                struct module *csi2_drv = csi2_pdev->dev.driver->owner;
+                platform_device_del(csi2_pdev);
+                csi2_pdev->resource = NULL;
+                platform_device_put(csi2_pdev);
+                module_put(csi2_drv);
+        }
+        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_VERSION("0.0.6");
+MODULE_ALIAS("platform:sh_mobile_ceu");