sh_mobile_ceu_camera.c

trident tm5600的linux驱动

/*
 * 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 <[e-mail]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/io.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/moduleparam.h>
#include <linux/time.h>
#include <linux/version.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/mutex.h>
#include <linux/videodev2.h>

#include <media/v4l2-common.h>
#include <media/v4l2-dev.h>
#include <media/soc_camera.h>
#include <media/sh_mobile_ceu.h>
#include <media/videobuf-dma-contig.h>

/* register offsets for sh7722 / sh7723 */

#define CAPSR  0x00 /* 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 */

static DEFINE_MUTEX(camera_lock);

/* per video frame buffer */
struct sh_mobile_ceu_buffer {
	struct videobuf_buffer vb; /* v4l buffer must be first */
	const struct soc_camera_data_format *fmt;
};

struct sh_mobile_ceu_dev {
	struct device *dev;
	struct soc_camera_host ici;
	struct soc_camera_device *icd;

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

	/* lock used to protect videobuf */
	spinlock_t lock;
	struct list_head capture;
	struct videobuf_buffer *active;

	struct sh_mobile_ceu_info *pdata;
};

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

static unsigned long ceu_read(struct sh_mobile_ceu_dev *priv,
			      unsigned long reg_offs)
{
	return ioread32(priv->base + reg_offs);
}

/*
 *  Videobuf operations
 */
static int sh_mobile_ceu_videobuf_setup(struct videobuf_queue *vq,
					unsigned int *count,
					unsigned int *size)
{
	struct soc_camera_device *icd = vq->priv_data;
	struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
	struct sh_mobile_ceu_dev *pcdev = ici->priv;
	int bytes_per_pixel = (icd->current_fmt->depth + 7) >> 3;

	*size = PAGE_ALIGN(icd->width * icd->height * bytes_per_pixel);

	if (0 == *count)
		*count = 2;

	if (pcdev->video_limit) {
		while (*size * *count > pcdev->video_limit)
			(*count)--;
	}

	dev_dbg(&icd->dev, "count=%d, size=%d\n", *count, *size);

	return 0;
}

static void free_buffer(struct videobuf_queue *vq,
			struct sh_mobile_ceu_buffer *buf)
{
	struct soc_camera_device *icd = vq->priv_data;

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

	if (in_interrupt())
		BUG();

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

static void sh_mobile_ceu_capture(struct sh_mobile_ceu_dev *pcdev)
{
	ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) & ~1);
	ceu_write(pcdev, CETCR, ~ceu_read(pcdev, CETCR) & 0x0317f313);
	ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) | 1);

	ceu_write(pcdev, CAPCR, ceu_read(pcdev, CAPCR) & ~0x10000);

	ceu_write(pcdev, CETCR, 0x0317f313 ^ 0x10);

	if (pcdev->active) {
		pcdev->active->state = VIDEOBUF_ACTIVE;
		ceu_write(pcdev, CDAYR, videobuf_to_dma_contig(pcdev->active));
		ceu_write(pcdev, CAPSR, 0x1); /* start capture */
	}
}

static int sh_mobile_ceu_videobuf_prepare(struct videobuf_queue *vq,
					  struct videobuf_buffer *vb,
					  enum v4l2_field field)
{
	struct soc_camera_device *icd = vq->priv_data;
	struct sh_mobile_ceu_buffer *buf;
	int ret;

	buf = container_of(vb, struct sh_mobile_ceu_buffer, vb);

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

	/* Added list head initialization on alloc */
	WARN_ON(!list_empty(&vb->queue));

#ifdef DEBUG
	/* This can be useful if you want to see if we actually fill
	 * the buffer with something */
	memset((void *)vb->baddr, 0xaa, vb->bsize);
#endif

	BUG_ON(NULL == icd->current_fmt);

	if (buf->fmt	!= icd->current_fmt ||
	    vb->width	!= icd->width ||
	    vb->height	!= icd->height ||
	    vb->field	!= field) {
		buf->fmt	= icd->current_fmt;
		vb->width	= icd->width;
		vb->height	= icd->height;
		vb->field	= field;
		vb->state	= VIDEOBUF_NEEDS_INIT;
	}

	vb->size = vb->width * vb->height * ((buf->fmt->depth + 7) >> 3);
	if (0 != vb->baddr && vb->bsize < vb->size) {
		ret = -EINVAL;
		goto out;
	}

	if (vb->state == VIDEOBUF_NEEDS_INIT) {
		ret = videobuf_iolock(vq, vb, NULL);
		if (ret)
			goto fail;
		vb->state = VIDEOBUF_PREPARED;
	}

	return 0;
fail:
	free_buffer(vq, buf);
out:
	return ret;
}

static void sh_mobile_ceu_videobuf_queue(struct videobuf_queue *vq,
					 struct videobuf_buffer *vb)
{
	struct soc_camera_device *icd = vq->priv_data;
	struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
	struct sh_mobile_ceu_dev *pcdev = ici->priv;
	unsigned long flags;

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

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

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

	spin_unlock_irqrestore(&pcdev->lock, flags);
}

static void sh_mobile_ceu_videobuf_release(struct videobuf_queue *vq,
					   struct videobuf_buffer *vb)
{
	free_buffer(vq, container_of(vb, struct sh_mobile_ceu_buffer, vb));
}

static struct videobuf_queue_ops sh_mobile_ceu_videobuf_ops = {
	.buf_setup      = sh_mobile_ceu_videobuf_setup,
	.buf_prepare    = sh_mobile_ceu_videobuf_prepare,
	.buf_queue      = sh_mobile_ceu_videobuf_queue,
	.buf_release    = sh_mobile_ceu_videobuf_release,
};

static irqreturn_t sh_mobile_ceu_irq(int irq, void *data)
{
	struct sh_mobile_ceu_dev *pcdev = data;
	struct videobuf_buffer *vb;
	unsigned long flags;

	spin_lock_irqsave(&pcdev->lock, flags);

	vb = pcdev->active;
	list_del_init(&vb->queue);

	if (!list_empty(&pcdev->capture))
		pcdev->active = list_entry(pcdev->capture.next,
					   struct videobuf_buffer, queue);
	else
		pcdev->active = NULL;

	sh_mobile_ceu_capture(pcdev);

	vb->state = VIDEOBUF_DONE;
	do_gettimeofday(&vb->ts);
	vb->field_count++;
	wake_up(&vb->done);
	spin_unlock_irqrestore(&pcdev->lock, flags);

	return IRQ_HANDLED;
}

static int sh_mobile_ceu_add_device(struct soc_camera_device *icd)
{
	struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
	struct sh_mobile_ceu_dev *pcdev = ici->priv;
	int ret = -EBUSY;

	mutex_lock(&camera_lock);

	if (pcdev->icd)
		goto err;

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

	ret = icd->ops->init(icd);
	if (ret)
		goto err;

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

	pcdev->icd = icd;
err:
	mutex_unlock(&camera_lock);

	return ret;
}

static void sh_mobile_ceu_remove_device(struct soc_camera_device *icd)
{
	struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
	struct sh_mobile_ceu_dev *pcdev = ici->priv;
	unsigned long flags;

	BUG_ON(icd != pcdev->icd);

	/* disable capture, disable interrupts */
	ceu_write(pcdev, CEIER, 0);
	ceu_write(pcdev, CAPSR, 1 << 16); /* reset */

	/* 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);