pxa_camera.c

trident tm5600的linux驱动

		bpp = 0x40;
		break;
	case SOCAM_DATAWIDTH_9:
		icd->buswidth = 9;
		dw = 3;
		bpp = 0x20;
		break;
	default:
		/* Actually it can only be 8 now,
		 * default is just to silence compiler warnings */
	case SOCAM_DATAWIDTH_8:
		icd->buswidth = 8;
		dw = 2;
		bpp = 0;
	}

	if (pcdev->platform_flags & PXA_CAMERA_PCLK_EN)
		cicr4 |= CICR4_PCLK_EN;
	if (pcdev->platform_flags & PXA_CAMERA_MCLK_EN)
		cicr4 |= CICR4_MCLK_EN;
	if (common_flags & SOCAM_PCLK_SAMPLE_FALLING)
		cicr4 |= CICR4_PCP;
	if (common_flags & SOCAM_HSYNC_ACTIVE_LOW)
		cicr4 |= CICR4_HSP;
	if (common_flags & SOCAM_VSYNC_ACTIVE_LOW)
		cicr4 |= CICR4_VSP;

	cicr0 = CICR0;
	if (cicr0 & CICR0_ENB)
		CICR0 = cicr0 & ~CICR0_ENB;

	cicr1 = CICR1_PPL_VAL(icd->width - 1) | bpp | dw;

	switch (pixfmt) {
	case V4L2_PIX_FMT_YUV422P:
		pcdev->channels = 3;
		cicr1 |= CICR1_YCBCR_F;
	case V4L2_PIX_FMT_YUYV:
		cicr1 |= CICR1_COLOR_SP_VAL(2);
		break;
	case V4L2_PIX_FMT_RGB555:
		cicr1 |= CICR1_RGB_BPP_VAL(1) | CICR1_RGBT_CONV_VAL(2) |
			CICR1_TBIT | CICR1_COLOR_SP_VAL(1);
		break;
	case V4L2_PIX_FMT_RGB565:
		cicr1 |= CICR1_COLOR_SP_VAL(1) | CICR1_RGB_BPP_VAL(2);
		break;
	}

	CICR1 = cicr1;
	CICR2 = 0;
	CICR3 = CICR3_LPF_VAL(icd->height - 1) |
		CICR3_BFW_VAL(min((unsigned short)255, icd->y_skip_top));
	CICR4 = mclk_get_divisor(pcdev) | cicr4;

	/* CIF interrupts are not used, only DMA */
	CICR0 = (pcdev->platform_flags & PXA_CAMERA_MASTER ?
		 CICR0_SIM_MP : (CICR0_SL_CAP_EN | CICR0_SIM_SP)) |
		CICR0_DMAEN | CICR0_IRQ_MASK | (cicr0 & CICR0_ENB);

	return 0;
}

static int pxa_camera_try_bus_param(struct soc_camera_device *icd, __u32 pixfmt)
{
	struct soc_camera_host *ici =
		to_soc_camera_host(icd->dev.parent);
	struct pxa_camera_dev *pcdev = ici->priv;
	unsigned long bus_flags, camera_flags;
	int ret = test_platform_param(pcdev, icd->buswidth, &bus_flags);

	if (ret < 0)
		return ret;

	camera_flags = icd->ops->query_bus_param(icd);

	return soc_camera_bus_param_compatible(camera_flags, bus_flags) ? 0 : -EINVAL;
}

static int pxa_camera_set_fmt_cap(struct soc_camera_device *icd,
				  __u32 pixfmt, struct v4l2_rect *rect)
{
	return icd->ops->set_fmt_cap(icd, pixfmt, rect);
}

static int pxa_camera_try_fmt_cap(struct soc_camera_device *icd,
				  struct v4l2_format *f)
{
	/* limit to pxa hardware capabilities */
	if (f->fmt.pix.height < 32)
		f->fmt.pix.height = 32;
	if (f->fmt.pix.height > 2048)
		f->fmt.pix.height = 2048;
	if (f->fmt.pix.width < 48)
		f->fmt.pix.width = 48;
	if (f->fmt.pix.width > 2048)
		f->fmt.pix.width = 2048;
	f->fmt.pix.width &= ~0x01;

	/* limit to sensor capabilities */
	return icd->ops->try_fmt_cap(icd, f);
}

static int pxa_camera_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 pxa_buffer *buf = container_of(icf->vb_vidq.bufs[i],
						      struct pxa_buffer, vb);
		buf->inwork = 0;
		INIT_LIST_HEAD(&buf->vb.queue);
	}

	return 0;
}

static unsigned int pxa_camera_poll(struct file *file, poll_table *pt)
{
	struct soc_camera_file *icf = file->private_data;
	struct pxa_buffer *buf;

	buf = list_entry(icf->vb_vidq.stream.next, struct pxa_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 pxa_camera_querycap(struct soc_camera_host *ici,
			       struct v4l2_capability *cap)
{
	/* cap->name is set by the firendly caller:-> */
	strlcpy(cap->card, pxa_cam_driver_description, sizeof(cap->card));
	cap->version = PXA_CAM_VERSION_CODE;
	cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;

	return 0;
}

static int pxa_camera_suspend(struct soc_camera_device *icd, pm_message_t state)
{
	struct soc_camera_host *ici =
		to_soc_camera_host(icd->dev.parent);
	struct pxa_camera_dev *pcdev = ici->priv;
	int i = 0, ret = 0;

	pcdev->save_cicr[i++] = CICR0;
	pcdev->save_cicr[i++] = CICR1;
	pcdev->save_cicr[i++] = CICR2;
	pcdev->save_cicr[i++] = CICR3;
	pcdev->save_cicr[i++] = CICR4;

	if ((pcdev->icd) && (pcdev->icd->ops->suspend))
		ret = pcdev->icd->ops->suspend(pcdev->icd, state);

	return ret;
}

static int pxa_camera_resume(struct soc_camera_device *icd)
{
	struct soc_camera_host *ici =
		to_soc_camera_host(icd->dev.parent);
	struct pxa_camera_dev *pcdev = ici->priv;
	int i = 0, ret = 0;

	DRCMR(68) = pcdev->dma_chans[0] | DRCMR_MAPVLD;
	DRCMR(69) = pcdev->dma_chans[1] | DRCMR_MAPVLD;
	DRCMR(70) = pcdev->dma_chans[2] | DRCMR_MAPVLD;

	CICR0 = pcdev->save_cicr[i++] & ~CICR0_ENB;
	CICR1 = pcdev->save_cicr[i++];
	CICR2 = pcdev->save_cicr[i++];
	CICR3 = pcdev->save_cicr[i++];
	CICR4 = pcdev->save_cicr[i++];

	if ((pcdev->icd) && (pcdev->icd->ops->resume))
		ret = pcdev->icd->ops->resume(pcdev->icd);

	/* Restart frame capture if active buffer exists */
	if (!ret && pcdev->active) {
		/* Reset the FIFOs */
		CIFR |= CIFR_RESET_F;
		/* Enable End-Of-Frame Interrupt */
		CICR0 &= ~CICR0_EOFM;
		/* Restart the Capture Interface */
		CICR0 |= CICR0_ENB;
	}

	return ret;
}

static struct soc_camera_host_ops pxa_soc_camera_host_ops = {
	.owner		= THIS_MODULE,
	.add		= pxa_camera_add_device,
	.remove		= pxa_camera_remove_device,
	.suspend	= pxa_camera_suspend,
	.resume		= pxa_camera_resume,
	.set_fmt_cap	= pxa_camera_set_fmt_cap,
	.try_fmt_cap	= pxa_camera_try_fmt_cap,
	.init_videobuf	= pxa_camera_init_videobuf,
	.reqbufs	= pxa_camera_reqbufs,
	.poll		= pxa_camera_poll,
	.querycap	= pxa_camera_querycap,
	.try_bus_param	= pxa_camera_try_bus_param,
	.set_bus_param	= pxa_camera_set_bus_param,
};

/* Should be allocated dynamically too, but we have only one. */
static struct soc_camera_host pxa_soc_camera_host = {
	.drv_name		= PXA_CAM_DRV_NAME,
	.ops			= &pxa_soc_camera_host_ops,
};

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

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	irq = platform_get_irq(pdev, 0);
	if (!res || irq < 0) {
		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;
	}

	pcdev->clk = clk_get(&pdev->dev, "CAMCLK");
	if (IS_ERR(pcdev->clk)) {
		err = PTR_ERR(pcdev->clk);
		goto exit_kfree;
	}

	dev_set_drvdata(&pdev->dev, pcdev);
	pcdev->res = res;

	pcdev->pdata = pdev->dev.platform_data;
	pcdev->platform_flags = pcdev->pdata->flags;
	if (!(pcdev->platform_flags & (PXA_CAMERA_DATAWIDTH_8 |
			PXA_CAMERA_DATAWIDTH_9 | PXA_CAMERA_DATAWIDTH_10))) {
		/* Platform hasn't set available data widths. This is bad.
		 * Warn and use a default. */
		dev_warn(&pdev->dev, "WARNING! Platform hasn't set available "
			 "data widths, using default 10 bit\n");
		pcdev->platform_flags |= PXA_CAMERA_DATAWIDTH_10;
	}
	pcdev->platform_mclk_10khz = pcdev->pdata->mclk_10khz;
	if (!pcdev->platform_mclk_10khz) {
		dev_warn(&pdev->dev,
			 "mclk_10khz == 0! Please, fix your platform data. "
			 "Using default 20MHz\n");
		pcdev->platform_mclk_10khz = 2000;
	}

	INIT_LIST_HEAD(&pcdev->capture);
	spin_lock_init(&pcdev->lock);

	/*
	 * Request the regions.
	 */
	if (!request_mem_region(res->start, res->end - res->start + 1,
				PXA_CAM_DRV_NAME)) {
		err = -EBUSY;
		goto exit_clk;
	}

	base = ioremap(res->start, res->end - res->start + 1);
	if (!base) {
		err = -ENOMEM;
		goto exit_release;
	}
	pcdev->irq = irq;
	pcdev->base = base;
	pcdev->dev = &pdev->dev;

	/* request dma */
	err = pxa_request_dma("CI_Y", DMA_PRIO_HIGH,
			      pxa_camera_dma_irq_y, pcdev);
	if (err < 0) {
		dev_err(pcdev->dev, "Can't request DMA for Y\n");
		goto exit_iounmap;
	}
	pcdev->dma_chans[0] = err;
	dev_dbg(pcdev->dev, "got DMA channel %d\n", pcdev->dma_chans[0]);

	err = pxa_request_dma("CI_U", DMA_PRIO_HIGH,
			      pxa_camera_dma_irq_u, pcdev);
	if (err < 0) {
		dev_err(pcdev->dev, "Can't request DMA for U\n");
		goto exit_free_dma_y;
	}
	pcdev->dma_chans[1] = err;
	dev_dbg(pcdev->dev, "got DMA channel (U) %d\n", pcdev->dma_chans[1]);

	err = pxa_request_dma("CI_V", DMA_PRIO_HIGH,
			      pxa_camera_dma_irq_v, pcdev);
	if (err < 0) {
		dev_err(pcdev->dev, "Can't request DMA for V\n");
		goto exit_free_dma_u;
	}
	pcdev->dma_chans[2] = err;
	dev_dbg(pcdev->dev, "got DMA channel (V) %d\n", pcdev->dma_chans[2]);

	DRCMR(68) = pcdev->dma_chans[0] | DRCMR_MAPVLD;
	DRCMR(69) = pcdev->dma_chans[1] | DRCMR_MAPVLD;
	DRCMR(70) = pcdev->dma_chans[2] | DRCMR_MAPVLD;

	/* request irq */
	err = request_irq(pcdev->irq, pxa_camera_irq, 0, PXA_CAM_DRV_NAME,
			  pcdev);
	if (err) {
		dev_err(pcdev->dev, "Camera interrupt register failed \n");
		goto exit_free_dma;
	}

	pxa_soc_camera_host.priv	= pcdev;
	pxa_soc_camera_host.dev.parent	= &pdev->dev;
	pxa_soc_camera_host.nr		= pdev->id;
	err = soc_camera_host_register(&pxa_soc_camera_host);
	if (err)
		goto exit_free_irq;

	return 0;

exit_free_irq:
	free_irq(pcdev->irq, pcdev);
exit_free_dma:
	pxa_free_dma(pcdev->dma_chans[2]);
exit_free_dma_u:
	pxa_free_dma(pcdev->dma_chans[1]);
exit_free_dma_y:
	pxa_free_dma(pcdev->dma_chans[0]);
exit_iounmap:
	iounmap(base);
exit_release:
	release_mem_region(res->start, res->end - res->start + 1);
exit_clk:
	clk_put(pcdev->clk);
exit_kfree:
	kfree(pcdev);
exit:
	return err;
}

static int __devexit pxa_camera_remove(struct platform_device *pdev)
{
	struct pxa_camera_dev *pcdev = platform_get_drvdata(pdev);
	struct resource *res;

	clk_put(pcdev->clk);

	pxa_free_dma(pcdev->dma_chans[0]);
	pxa_free_dma(pcdev->dma_chans[1]);
	pxa_free_dma(pcdev->dma_chans[2]);
	free_irq(pcdev->irq, pcdev);

	soc_camera_host_unregister(&pxa_soc_camera_host);

	iounmap(pcdev->base);

	res = pcdev->res;
	release_mem_region(res->start, res->end - res->start + 1);

	kfree(pcdev);

	dev_info(&pdev->dev, "PXA Camera driver unloaded\n");

	return 0;
}

static struct platform_driver pxa_camera_driver = {
	.driver 	= {
		.name	= PXA_CAM_DRV_NAME,
	},
	.probe		= pxa_camera_probe,
	.remove		= __exit_p(pxa_camera_remove),
};


static int __devinit pxa_camera_init(void)
{
	return platform_driver_register(&pxa_camera_driver);
}

static void __exit pxa_camera_exit(void)
{
	platform_driver_unregister(&pxa_camera_driver);
}

module_init(pxa_camera_init);
module_exit(pxa_camera_exit);

MODULE_DESCRIPTION("PXA27x SoC Camera Host driver");
MODULE_AUTHOR("Guennadi Liakhovetski <[e-mail]>");
MODULE_LICENSE("GPL");