sh_mobile_ceu_camera.c 25.6 KB
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/*
 * 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 <[email protected]>
 *
 * 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/videodev2.h>
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#include <linux/pm_runtime.h>
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#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 */

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#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 */
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/* 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 soc_camera_host ici;
	struct soc_camera_device *icd;

	unsigned int irq;
	void __iomem *base;
	unsigned long video_limit;

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	/* lock used to protect videobuf */
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	spinlock_t lock;
	struct list_head capture;
	struct videobuf_buffer *active;
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	int is_interlaced;
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	struct sh_mobile_ceu_info *pdata;
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	const struct soc_camera_data_format *camera_fmt;
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};

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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;
}

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static void ceu_write(struct sh_mobile_ceu_dev *priv,
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		      unsigned long reg_offs, u32 data)
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{
	iowrite32(data, priv->base + reg_offs);
}

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static u32 ceu_read(struct sh_mobile_ceu_dev *priv, unsigned long reg_offs)
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{
	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;

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	dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %zd\n", __func__,
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		&buf->vb, buf->vb.baddr, buf->vb.bsize);

	if (in_interrupt())
		BUG();

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	videobuf_waiton(&buf->vb, 0, 0);
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	videobuf_dma_contig_free(vq, &buf->vb);
	dev_dbg(&icd->dev, "%s freed\n", __func__);
	buf->vb.state = VIDEOBUF_NEEDS_INIT;
}

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#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_CAPCR_CTNCP (1 << 16) /* continuous capture mode (if set) */


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static void sh_mobile_ceu_capture(struct sh_mobile_ceu_dev *pcdev)
{
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	struct soc_camera_device *icd = pcdev->icd;
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	dma_addr_t phys_addr_top, phys_addr_bottom;
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	/* 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_CPEIE);
	ceu_write(pcdev, CETCR, ~ceu_read(pcdev, CETCR) & CEU_CETCR_MAGIC);
	ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) | CEU_CEIER_CPEIE);
	ceu_write(pcdev, CAPCR, ceu_read(pcdev, CAPCR) & ~CEU_CAPCR_CTNCP);
	ceu_write(pcdev, CETCR, CEU_CETCR_MAGIC ^ CEU_CETCR_IGRW);
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	if (!pcdev->active)
		return;

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	phys_addr_top = videobuf_to_dma_contig(pcdev->active);
	ceu_write(pcdev, CDAYR, phys_addr_top);
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	if (pcdev->is_interlaced) {
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		phys_addr_bottom = phys_addr_top + icd->width;
		ceu_write(pcdev, CDBYR, phys_addr_bottom);
	}
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	switch (icd->current_fmt->fourcc) {
	case V4L2_PIX_FMT_NV12:
	case V4L2_PIX_FMT_NV21:
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	case V4L2_PIX_FMT_NV16:
	case V4L2_PIX_FMT_NV61:
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		phys_addr_top += icd->width * icd->height;
		ceu_write(pcdev, CDACR, phys_addr_top);
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		if (pcdev->is_interlaced) {
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			phys_addr_bottom = phys_addr_top + icd->width;
			ceu_write(pcdev, CDBCR, phys_addr_bottom);
		}
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	}
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	pcdev->active->state = VIDEOBUF_ACTIVE;
	ceu_write(pcdev, CAPSR, 0x1); /* start capture */
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}

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);

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	dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %zd\n", __func__,
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		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;
}

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/* Called under spinlock_irqsave(&pcdev->lock, ...) */
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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;

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	dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %zd\n", __func__,
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		vb, vb->baddr, vb->bsize);

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	vb->state = VIDEOBUF_QUEUED;
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	list_add_tail(&vb->queue, &pcdev->capture);

	if (!pcdev->active) {
		pcdev->active = vb;
		sh_mobile_ceu_capture(pcdev);
	}
}

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;
}

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/* Called with .video_lock held */
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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;

	if (pcdev->icd)
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		return -EBUSY;
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	dev_info(&icd->dev,
		 "SuperH Mobile CEU driver attached to camera %d\n",
		 icd->devnum);

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	clk_enable(pcdev->clk);

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	ceu_write(pcdev, CAPSR, 1 << 16); /* reset */
	while (ceu_read(pcdev, CSTSR) & 1)
		msleep(1);

	pcdev->icd = icd;
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	return 0;
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}

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/* Called with .video_lock held */
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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;
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	unsigned long flags;
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	BUG_ON(icd != pcdev->icd);

	/* disable capture, disable interrupts */
	ceu_write(pcdev, CEIER, 0);
	ceu_write(pcdev, CAPSR, 1 << 16); /* reset */
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	/* make sure active buffer is canceled */
	spin_lock_irqsave(&pcdev->lock, flags);
	if (pcdev->active) {
		list_del(&pcdev->active->queue);
		pcdev->active->state = VIDEOBUF_ERROR;
		wake_up_all(&pcdev->active->done);
		pcdev->active = NULL;
	}
	spin_unlock_irqrestore(&pcdev->lock, flags);

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	clk_disable(pcdev->clk);

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	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;
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	int ret, buswidth, width, height, cfszr_width, cdwdr_width;
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	unsigned long camera_flags, common_flags, value;
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	int yuv_mode, yuv_lineskip;
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	camera_flags = icd->ops->query_bus_param(icd);
	common_flags = soc_camera_bus_param_compatible(camera_flags,
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						       make_bus_param(pcdev));
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	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);

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	value = 0x00000010; /* data fetch by default */
	yuv_mode = yuv_lineskip = 0;

	switch (icd->current_fmt->fourcc) {
	case V4L2_PIX_FMT_NV12:
	case V4L2_PIX_FMT_NV21:
		yuv_lineskip = 1; /* skip for NV12/21, no skip for NV16/61 */
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		/* fall-through */
	case V4L2_PIX_FMT_NV16:
	case V4L2_PIX_FMT_NV61:
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		yuv_mode = 1;
		switch (pcdev->camera_fmt->fourcc) {
		case V4L2_PIX_FMT_UYVY:
			value = 0x00000000; /* Cb0, Y0, Cr0, Y1 */
			break;
		case V4L2_PIX_FMT_VYUY:
			value = 0x00000100; /* Cr0, Y0, Cb0, Y1 */
			break;
		case V4L2_PIX_FMT_YUYV:
			value = 0x00000200; /* Y0, Cb0, Y1, Cr0 */
			break;
		case V4L2_PIX_FMT_YVYU:
			value = 0x00000300; /* Y0, Cr0, Y1, Cb0 */
			break;
		default:
			BUG();
		}
	}

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	if (icd->current_fmt->fourcc == V4L2_PIX_FMT_NV21 ||
	    icd->current_fmt->fourcc == V4L2_PIX_FMT_NV61)
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		value ^= 0x00000100; /* swap U, V to change from NV1x->NVx1 */
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	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;
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	ceu_write(pcdev, CAMCR, value);

	ceu_write(pcdev, CAPCR, 0x00300000);
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	ceu_write(pcdev, CAIFR, pcdev->is_interlaced ? 0x101 : 0);
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	mdelay(1);

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	if (yuv_mode) {
		width = icd->width * 2;
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		width = buswidth == 16 ? width / 2 : width;
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		cfszr_width = cdwdr_width = icd->width;
	} else {
		width = icd->width * ((icd->current_fmt->depth + 7) >> 3);
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		width = buswidth == 16 ? width / 2 : width;
		cfszr_width = buswidth == 8 ? width / 2 : width;
		cdwdr_width = buswidth == 16 ? width * 2 : width;
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	}
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	height = icd->height;
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	if (pcdev->is_interlaced) {
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		height /= 2;
		cdwdr_width *= 2;
	}

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	ceu_write(pcdev, CAMOR, 0);
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	ceu_write(pcdev, CAPWR, (height << 16) | width);
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	ceu_write(pcdev, CFLCR, 0); /* no scaling */
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	ceu_write(pcdev, CFSZR, (height << 16) | cfszr_width);
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	ceu_write(pcdev, CLFCR, 0); /* no lowpass filter */
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	/* 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,
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	 * using 7 we swap the data bytes to match the incoming order:
	 * D0, D1, D2, D3, D4, D5, D6, D7
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	 */
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	value = 0x00000017;
	if (yuv_lineskip)
		value &= ~0x00000010; /* convert 4:2:2 -> 4:2:0 */

	ceu_write(pcdev, CDOCR, value);
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	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 */
	return 0;
}

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static int sh_mobile_ceu_try_bus_param(struct soc_camera_device *icd)
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{
	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,
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						       make_bus_param(pcdev));
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	if (!common_flags)
		return -EINVAL;

	return 0;
}

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static const struct soc_camera_data_format sh_mobile_ceu_formats[] = {
	{
		.name		= "NV12",
		.depth		= 12,
		.fourcc		= V4L2_PIX_FMT_NV12,
		.colorspace	= V4L2_COLORSPACE_JPEG,
	},
	{
		.name		= "NV21",
		.depth		= 12,
		.fourcc		= V4L2_PIX_FMT_NV21,
		.colorspace	= V4L2_COLORSPACE_JPEG,
	},
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	{
		.name		= "NV16",
		.depth		= 16,
		.fourcc		= V4L2_PIX_FMT_NV16,
		.colorspace	= V4L2_COLORSPACE_JPEG,
	},
	{
		.name		= "NV61",
		.depth		= 16,
		.fourcc		= V4L2_PIX_FMT_NV61,
		.colorspace	= V4L2_COLORSPACE_JPEG,
	},
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};

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static int sh_mobile_ceu_get_formats(struct soc_camera_device *icd, int idx,
				     struct soc_camera_format_xlate *xlate)
{
	struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
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	int ret, k, n;
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	int formats = 0;

	ret = sh_mobile_ceu_try_bus_param(icd);
	if (ret < 0)
		return 0;

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	/* Beginning of a pass */
	if (!idx)
		icd->host_priv = NULL;

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	switch (icd->formats[idx].fourcc) {
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	case V4L2_PIX_FMT_UYVY:
	case V4L2_PIX_FMT_VYUY:
	case V4L2_PIX_FMT_YUYV:
	case V4L2_PIX_FMT_YVYU:
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		if (icd->host_priv)
			goto add_single_format;

		/*
		 * 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.
		 */
		icd->host_priv = (void *)sh_mobile_ceu_formats;

601 602 603 604 605 606 607
		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->cam_fmt = icd->formats + idx;
			xlate->buswidth = icd->formats[idx].depth;
			xlate++;
608
			dev_dbg(ici->v4l2_dev.dev, "Providing format %s using %s\n",
609 610 611
				sh_mobile_ceu_formats[k].name,
				icd->formats[idx].name);
		}
612
	default:
613
add_single_format:
614 615 616 617 618 619 620
		/* Generic pass-through */
		formats++;
		if (xlate) {
			xlate->host_fmt = icd->formats + idx;
			xlate->cam_fmt = icd->formats + idx;
			xlate->buswidth = icd->formats[idx].depth;
			xlate++;
621
			dev_dbg(ici->v4l2_dev.dev,
622 623 624 625 626 627 628 629
				"Providing format %s in pass-through mode\n",
				icd->formats[idx].name);
		}
	}

	return formats;
}

630 631 632 633 634 635
static int sh_mobile_ceu_set_crop(struct soc_camera_device *icd,
				  struct v4l2_rect *rect)
{
	return icd->ops->set_crop(icd, rect);
}

636
static int sh_mobile_ceu_set_fmt(struct soc_camera_device *icd,
637
				 struct v4l2_format *f)
638
{
639
	struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
640
	struct sh_mobile_ceu_dev *pcdev = ici->priv;
641
	__u32 pixfmt = f->fmt.pix.pixelformat;
642
	const struct soc_camera_format_xlate *xlate;
643 644
	int ret;

645 646
	xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
	if (!xlate) {
647
		dev_warn(ici->v4l2_dev.dev, "Format %x not found\n", pixfmt);
648
		return -EINVAL;
649 650
	}

651 652 653
	f->fmt.pix.pixelformat = xlate->cam_fmt->fourcc;
	ret = v4l2_device_call_until_err(&ici->v4l2_dev, (__u32)icd, video, s_fmt, f);
	f->fmt.pix.pixelformat = pixfmt;
654
	if (!ret) {
655 656
		icd->buswidth = xlate->buswidth;
		icd->current_fmt = xlate->host_fmt;
657
		pcdev->camera_fmt = xlate->cam_fmt;
658
	}
659 660

	return ret;
661 662
}

663 664
static int sh_mobile_ceu_try_fmt(struct soc_camera_device *icd,
				 struct v4l2_format *f)
665
{
666
	struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
667
	struct sh_mobile_ceu_dev *pcdev = ici->priv;
668 669
	const struct soc_camera_format_xlate *xlate;
	__u32 pixfmt = f->fmt.pix.pixelformat;
670
	int ret;
671

672 673
	xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
	if (!xlate) {
674
		dev_warn(ici->v4l2_dev.dev, "Format %x not found\n", pixfmt);
675
		return -EINVAL;
676
	}
677

678 679
	/* FIXME: calculate using depth and bus width */

680 681
	v4l_bound_align_image(&f->fmt.pix.width, 2, 2560, 1,
			      &f->fmt.pix.height, 4, 1920, 2, 0);
682

683
	f->fmt.pix.bytesperline = f->fmt.pix.width *
684
		DIV_ROUND_UP(xlate->host_fmt->depth, 8);
685 686
	f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline;

687 688
	f->fmt.pix.pixelformat = xlate->cam_fmt->fourcc;

689
	/* limit to sensor capabilities */
690 691
	ret = v4l2_device_call_until_err(&ici->v4l2_dev, (__u32)icd, video, try_fmt, f);
	f->fmt.pix.pixelformat = pixfmt;
692 693 694 695 696
	if (ret < 0)
		return ret;

	switch (f->fmt.pix.field) {
	case V4L2_FIELD_INTERLACED:
697
		pcdev->is_interlaced = 1;
698 699 700 701 702
		break;
	case V4L2_FIELD_ANY:
		f->fmt.pix.field = V4L2_FIELD_NONE;
		/* fall-through */
	case V4L2_FIELD_NONE:
703
		pcdev->is_interlaced = 0;
704 705 706 707 708 709 710
		break;
	default:
		ret = -EINVAL;
		break;
	}

	return ret;
711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766
}

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,
767
				       ici->v4l2_dev.dev, &pcdev->lock,
768
				       V4L2_BUF_TYPE_VIDEO_CAPTURE,
769 770
				       pcdev->is_interlaced ?
				       V4L2_FIELD_INTERLACED : V4L2_FIELD_NONE,
771 772 773 774 775 776 777 778
				       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,
779
	.get_formats	= sh_mobile_ceu_get_formats,
780
	.set_crop	= sh_mobile_ceu_set_crop,
781 782
	.set_fmt	= sh_mobile_ceu_set_fmt,
	.try_fmt	= sh_mobile_ceu_try_fmt,
783 784 785 786 787 788 789
	.reqbufs	= sh_mobile_ceu_reqbufs,
	.poll		= sh_mobile_ceu_poll,
	.querycap	= sh_mobile_ceu_querycap,
	.set_bus_param	= sh_mobile_ceu_set_bus_param,
	.init_videobuf	= sh_mobile_ceu_init_videobuf,
};

790
static int __devinit sh_mobile_ceu_probe(struct platform_device *pdev)
791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822
{
	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;
	}

	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;
	}

823
	base = ioremap_nocache(res->start, resource_size(res));
824 825 826 827 828 829 830 831 832 833 834 835 836 837
	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,
838
						  resource_size(res),
839 840 841 842 843 844 845 846
						  DMA_MEMORY_MAP |
						  DMA_MEMORY_EXCLUSIVE);
		if (!err) {
			dev_err(&pdev->dev, "Unable to declare CEU memory.\n");
			err = -ENXIO;
			goto exit_iounmap;
		}

847
		pcdev->video_limit = resource_size(res);
848 849 850 851
	}

	/* request irq */
	err = request_irq(pcdev->irq, sh_mobile_ceu_irq, IRQF_DISABLED,
852
			  dev_name(&pdev->dev), pcdev);
853 854 855 856 857
	if (err) {
		dev_err(&pdev->dev, "Unable to register CEU interrupt.\n");
		goto exit_release_mem;
	}

858 859 860
	pm_suspend_ignore_children(&pdev->dev, true);
	pm_runtime_enable(&pdev->dev);
	pm_runtime_resume(&pdev->dev);
861

862
	pcdev->ici.priv = pcdev;
863
	pcdev->ici.v4l2_dev.dev = &pdev->dev;
864
	pcdev->ici.nr = pdev->id;
865 866
	pcdev->ici.drv_name = dev_name(&pdev->dev);
	pcdev->ici.ops = &sh_mobile_ceu_host_ops;
867 868 869

	err = soc_camera_host_register(&pcdev->ici);
	if (err)
870
		goto exit_free_irq;
871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886

	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;
}

887
static int __devexit sh_mobile_ceu_remove(struct platform_device *pdev)
888
{
889 890 891
	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);
892

893
	soc_camera_host_unregister(soc_host);
894 895 896 897 898 899 900 901
	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;
}

902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918
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 struct dev_pm_ops sh_mobile_ceu_dev_pm_ops = {
	.runtime_suspend = sh_mobile_ceu_runtime_nop,
	.runtime_resume = sh_mobile_ceu_runtime_nop,
};

919 920 921
static struct platform_driver sh_mobile_ceu_driver = {
	.driver 	= {
		.name	= "sh_mobile_ceu",
922
		.pm	= &sh_mobile_ceu_dev_pm_ops,
923 924
	},
	.probe		= sh_mobile_ceu_probe,
925
	.remove		= __exit_p(sh_mobile_ceu_remove),
926 927 928 929 930 931 932 933 934
};

static int __init sh_mobile_ceu_init(void)
{
	return platform_driver_register(&sh_mobile_ceu_driver);
}

static void __exit sh_mobile_ceu_exit(void)
{
935
	platform_driver_unregister(&sh_mobile_ceu_driver);
936 937 938 939 940 941 942 943
}

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");
944
MODULE_ALIAS("platform:sh_mobile_ceu");