sh_mobile_ceu_camera.c 25.5 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;
	int ret = -EBUSY;

	if (pcdev->icd)
		goto err;

	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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	ret = icd->ops->init(icd);
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	if (ret) {
		clk_disable(pcdev->clk);
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		goto err;
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	}
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	ceu_write(pcdev, CAPSR, 1 << 16); /* reset */
	while (ceu_read(pcdev, CSTSR) & 1)
		msleep(1);

	pcdev->icd = icd;
err:
	return ret;
}

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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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	icd->ops->release(icd);

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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:
596 597 598 599 600 601 602 603 604 605 606 607 608 609
		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;

610 611 612 613 614 615 616
		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++;
617
			dev_dbg(ici->dev, "Providing format %s using %s\n",
618 619 620
				sh_mobile_ceu_formats[k].name,
				icd->formats[idx].name);
		}
621
	default:
622
add_single_format:
623 624 625 626 627 628 629
		/* 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++;
630
			dev_dbg(ici->dev,
631 632 633 634 635 636 637 638
				"Providing format %s in pass-through mode\n",
				icd->formats[idx].name);
		}
	}

	return formats;
}

639 640 641 642 643 644
static int sh_mobile_ceu_set_crop(struct soc_camera_device *icd,
				  struct v4l2_rect *rect)
{
	return icd->ops->set_crop(icd, rect);
}

645
static int sh_mobile_ceu_set_fmt(struct soc_camera_device *icd,
646
				 struct v4l2_format *f)
647
{
648
	struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
649
	struct sh_mobile_ceu_dev *pcdev = ici->priv;
650
	__u32 pixfmt = f->fmt.pix.pixelformat;
651
	const struct soc_camera_format_xlate *xlate;
652
	struct v4l2_format cam_f = *f;
653 654
	int ret;

655 656
	xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
	if (!xlate) {
657
		dev_warn(ici->dev, "Format %x not found\n", pixfmt);
658
		return -EINVAL;
659 660
	}

661 662
	cam_f.fmt.pix.pixelformat = xlate->cam_fmt->fourcc;
	ret = icd->ops->set_fmt(icd, &cam_f);
663

664
	if (!ret) {
665 666
		icd->buswidth = xlate->buswidth;
		icd->current_fmt = xlate->host_fmt;
667
		pcdev->camera_fmt = xlate->cam_fmt;
668
	}
669 670

	return ret;
671 672
}

673 674
static int sh_mobile_ceu_try_fmt(struct soc_camera_device *icd,
				 struct v4l2_format *f)
675
{
676
	struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
677
	struct sh_mobile_ceu_dev *pcdev = ici->priv;
678 679
	const struct soc_camera_format_xlate *xlate;
	__u32 pixfmt = f->fmt.pix.pixelformat;
680
	int ret;
681

682 683
	xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
	if (!xlate) {
684
		dev_warn(ici->dev, "Format %x not found\n", pixfmt);
685
		return -EINVAL;
686
	}
687

688 689
	/* FIXME: calculate using depth and bus width */

690 691
	v4l_bound_align_image(&f->fmt.pix.width, 2, 2560, 1,
			      &f->fmt.pix.height, 4, 1920, 2, 0);
692

693
	f->fmt.pix.bytesperline = f->fmt.pix.width *
694
		DIV_ROUND_UP(xlate->host_fmt->depth, 8);
695 696
	f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline;

697
	/* limit to sensor capabilities */
698 699 700 701 702 703
	ret = icd->ops->try_fmt(icd, f);
	if (ret < 0)
		return ret;

	switch (f->fmt.pix.field) {
	case V4L2_FIELD_INTERLACED:
704
		pcdev->is_interlaced = 1;
705 706 707 708 709
		break;
	case V4L2_FIELD_ANY:
		f->fmt.pix.field = V4L2_FIELD_NONE;
		/* fall-through */
	case V4L2_FIELD_NONE:
710
		pcdev->is_interlaced = 0;
711 712 713 714 715 716 717
		break;
	default:
		ret = -EINVAL;
		break;
	}

	return ret;
718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773
}

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,
774
				       ici->dev, &pcdev->lock,
775
				       V4L2_BUF_TYPE_VIDEO_CAPTURE,
776 777
				       pcdev->is_interlaced ?
				       V4L2_FIELD_INTERLACED : V4L2_FIELD_NONE,
778 779 780 781 782 783 784 785
				       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,
786
	.get_formats	= sh_mobile_ceu_get_formats,
787
	.set_crop	= sh_mobile_ceu_set_crop,
788 789
	.set_fmt	= sh_mobile_ceu_set_fmt,
	.try_fmt	= sh_mobile_ceu_try_fmt,
790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829
	.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,
};

static int sh_mobile_ceu_probe(struct platform_device *pdev)
{
	struct sh_mobile_ceu_dev *pcdev;
	struct resource *res;
	void __iomem *base;
	unsigned int irq;
	int err = 0;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	irq = platform_get_irq(pdev, 0);
	if (!res || !irq) {
		dev_err(&pdev->dev, "Not enough CEU platform resources.\n");
		err = -ENODEV;
		goto exit;
	}

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

	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;
	}

830
	base = ioremap_nocache(res->start, resource_size(res));
831 832 833 834 835 836 837 838 839 840 841 842 843 844
	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,
845
						  resource_size(res),
846 847 848 849 850 851 852 853
						  DMA_MEMORY_MAP |
						  DMA_MEMORY_EXCLUSIVE);
		if (!err) {
			dev_err(&pdev->dev, "Unable to declare CEU memory.\n");
			err = -ENXIO;
			goto exit_iounmap;
		}

854
		pcdev->video_limit = resource_size(res);
855 856 857 858
	}

	/* request irq */
	err = request_irq(pcdev->irq, sh_mobile_ceu_irq, IRQF_DISABLED,
859
			  dev_name(&pdev->dev), pcdev);
860 861 862 863 864
	if (err) {
		dev_err(&pdev->dev, "Unable to register CEU interrupt.\n");
		goto exit_release_mem;
	}

865 866 867
	pm_suspend_ignore_children(&pdev->dev, true);
	pm_runtime_enable(&pdev->dev);
	pm_runtime_resume(&pdev->dev);
868

869
	pcdev->ici.priv = pcdev;
870
	pcdev->ici.dev = &pdev->dev;
871
	pcdev->ici.nr = pdev->id;
872 873
	pcdev->ici.drv_name = dev_name(&pdev->dev);
	pcdev->ici.ops = &sh_mobile_ceu_host_ops;
874 875 876

	err = soc_camera_host_register(&pcdev->ici);
	if (err)
877
		goto exit_free_irq;
878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895

	return 0;

exit_free_irq:
	free_irq(pcdev->irq, pcdev);
exit_release_mem:
	if (platform_get_resource(pdev, IORESOURCE_MEM, 1))
		dma_release_declared_memory(&pdev->dev);
exit_iounmap:
	iounmap(base);
exit_kfree:
	kfree(pcdev);
exit:
	return err;
}

static int sh_mobile_ceu_remove(struct platform_device *pdev)
{
896 897 898
	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);
899

900
	soc_camera_host_unregister(soc_host);
901 902 903 904 905 906 907 908
	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;
}

909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925
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,
};

926 927 928
static struct platform_driver sh_mobile_ceu_driver = {
	.driver 	= {
		.name	= "sh_mobile_ceu",
929
		.pm	= &sh_mobile_ceu_dev_pm_ops,
930 931 932 933 934 935 936 937 938 939 940 941
	},
	.probe		= sh_mobile_ceu_probe,
	.remove		= sh_mobile_ceu_remove,
};

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

static void __exit sh_mobile_ceu_exit(void)
{
942
	platform_driver_unregister(&sh_mobile_ceu_driver);
943 944 945 946 947 948 949 950
}

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");
951
MODULE_ALIAS("platform:sh_mobile_ceu");