[deliverable/linux.git] / drivers / media / video / sh_mobile_csi2.c

/*
 * Driver for the SH-Mobile MIPI CSI-2 unit
 *
 * Copyright (C) 2010, Guennadi Liakhovetski <g.liakhovetski@gmx.de>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/io.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include <linux/videodev2.h>

#include <media/sh_mobile_ceu.h>
#include <media/sh_mobile_csi2.h>
#include <media/soc_camera.h>
#include <media/v4l2-common.h>
#include <media/v4l2-dev.h>
#include <media/v4l2-device.h>
#include <media/v4l2-mediabus.h>
#include <media/v4l2-subdev.h>

#define SH_CSI2_TREF	0x00
#define SH_CSI2_SRST	0x04
#define SH_CSI2_PHYCNT	0x08
#define SH_CSI2_CHKSUM	0x0C
#define SH_CSI2_VCDT	0x10

struct sh_csi2 {
	struct v4l2_subdev		subdev;
	struct list_head		list;
	unsigned int			irq;
	void __iomem			*base;
	struct platform_device		*pdev;
	struct sh_csi2_client_config	*client;
	unsigned long (*query_bus_param)(struct soc_camera_device *);
	int (*set_bus_param)(struct soc_camera_device *, unsigned long);
};

static int sh_csi2_try_fmt(struct v4l2_subdev *sd,
			   struct v4l2_mbus_framefmt *mf)
{
	struct sh_csi2 *priv = container_of(sd, struct sh_csi2, subdev);
	struct sh_csi2_pdata *pdata = priv->pdev->dev.platform_data;

	if (mf->width > 8188)
		mf->width = 8188;
	else if (mf->width & 1)
		mf->width &= ~1;

	switch (pdata->type) {
	case SH_CSI2C:
		switch (mf->code) {
		case V4L2_MBUS_FMT_UYVY8_2X8:		/* YUV422 */
		case V4L2_MBUS_FMT_YUYV8_1_5X8:		/* YUV420 */
		case V4L2_MBUS_FMT_Y8_1X8:		/* RAW8 */
		case V4L2_MBUS_FMT_SBGGR8_1X8:
		case V4L2_MBUS_FMT_SGRBG8_1X8:
			break;
		default:
			/* All MIPI CSI-2 devices must support one of primary formats */
			mf->code = V4L2_MBUS_FMT_YUYV8_2X8;
		}
		break;
	case SH_CSI2I:
		switch (mf->code) {
		case V4L2_MBUS_FMT_Y8_1X8:		/* RAW8 */
		case V4L2_MBUS_FMT_SBGGR8_1X8:
		case V4L2_MBUS_FMT_SGRBG8_1X8:
		case V4L2_MBUS_FMT_SBGGR10_1X10:	/* RAW10 */
		case V4L2_MBUS_FMT_SBGGR12_1X12:	/* RAW12 */
			break;
		default:
			/* All MIPI CSI-2 devices must support one of primary formats */
			mf->code = V4L2_MBUS_FMT_SBGGR8_1X8;
		}
		break;
	}

	return 0;
}

/*
 * We have done our best in try_fmt to try and tell the sensor, which formats
 * we support. If now the configuration is unsuitable for us we can only
 * error out.
 */
static int sh_csi2_s_fmt(struct v4l2_subdev *sd,
			 struct v4l2_mbus_framefmt *mf)
{
	struct sh_csi2 *priv = container_of(sd, struct sh_csi2, subdev);
	u32 tmp = (priv->client->channel & 3) << 8;

	dev_dbg(sd->v4l2_dev->dev, "%s(%u)\n", __func__, mf->code);
	if (mf->width > 8188 || mf->width & 1)
		return -EINVAL;

	switch (mf->code) {
	case V4L2_MBUS_FMT_UYVY8_2X8:
		tmp |= 0x1e;	/* YUV422 8 bit */
		break;
	case V4L2_MBUS_FMT_YUYV8_1_5X8:
		tmp |= 0x18;	/* YUV420 8 bit */
		break;
	case V4L2_MBUS_FMT_RGB555_2X8_PADHI_BE:
		tmp |= 0x21;	/* RGB555 */
		break;
	case V4L2_MBUS_FMT_RGB565_2X8_BE:
		tmp |= 0x22;	/* RGB565 */
		break;
	case V4L2_MBUS_FMT_Y8_1X8:
	case V4L2_MBUS_FMT_SBGGR8_1X8:
	case V4L2_MBUS_FMT_SGRBG8_1X8:
		tmp |= 0x2a;	/* RAW8 */
		break;
	default:
		return -EINVAL;
	}

	iowrite32(tmp, priv->base + SH_CSI2_VCDT);

	return 0;
}

static struct v4l2_subdev_video_ops sh_csi2_subdev_video_ops = {
	.s_mbus_fmt	= sh_csi2_s_fmt,
	.try_mbus_fmt	= sh_csi2_try_fmt,
};

static void sh_csi2_hwinit(struct sh_csi2 *priv)
{
	struct sh_csi2_pdata *pdata = priv->pdev->dev.platform_data;
	__u32 tmp = 0x10; /* Enable MIPI CSI clock lane */

	/* Reflect registers immediately */
	iowrite32(0x00000001, priv->base + SH_CSI2_TREF);
	/* reset CSI2 harware */
	iowrite32(0x00000001, priv->base + SH_CSI2_SRST);
	udelay(5);
	iowrite32(0x00000000, priv->base + SH_CSI2_SRST);

	if (priv->client->lanes & 3)
		tmp |= priv->client->lanes & 3;
	else
		/* Default - both lanes */
		tmp |= 3;

	if (priv->client->phy == SH_CSI2_PHY_MAIN)
		tmp |= 0x8000;

	iowrite32(tmp, priv->base + SH_CSI2_PHYCNT);

	tmp = 0;
	if (pdata->flags & SH_CSI2_ECC)
		tmp |= 2;
	if (pdata->flags & SH_CSI2_CRC)
		tmp |= 1;
	iowrite32(tmp, priv->base + SH_CSI2_CHKSUM);
}

static int sh_csi2_set_bus_param(struct soc_camera_device *icd,
				 unsigned long flags)
{
	return 0;
}

static unsigned long sh_csi2_query_bus_param(struct soc_camera_device *icd)
{
	struct soc_camera_link *icl = to_soc_camera_link(icd);
	const unsigned long flags = SOCAM_PCLK_SAMPLE_RISING |
		SOCAM_HSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_HIGH |
		SOCAM_MASTER | SOCAM_DATAWIDTH_8 | SOCAM_DATA_ACTIVE_HIGH;

	return soc_camera_apply_sensor_flags(icl, flags);
}

static int sh_csi2_client_connect(struct sh_csi2 *priv)
{
	struct sh_csi2_pdata *pdata = priv->pdev->dev.platform_data;
	struct v4l2_subdev *sd, *csi2_sd = &priv->subdev;
	struct soc_camera_device *icd = NULL;
	struct device *dev = v4l2_get_subdevdata(&priv->subdev);
	int i;

	v4l2_device_for_each_subdev(sd, csi2_sd->v4l2_dev)
		if (sd->grp_id) {
			icd = (struct soc_camera_device *)sd->grp_id;
			break;
		}

	if (!icd)
		return -EINVAL;

	for (i = 0; i < pdata->num_clients; i++)
		if (&pdata->clients[i].pdev->dev == icd->pdev)
			break;

	dev_dbg(dev, "%s(%p): found #%d\n", __func__, dev, i);

	if (i == pdata->num_clients)
		return -ENODEV;

	priv->client = pdata->clients + i;

	priv->set_bus_param		= icd->ops->set_bus_param;
	priv->query_bus_param		= icd->ops->query_bus_param;
	icd->ops->set_bus_param		= sh_csi2_set_bus_param;
	icd->ops->query_bus_param	= sh_csi2_query_bus_param;

	csi2_sd->grp_id = (long)icd;

	pm_runtime_get_sync(dev);

	sh_csi2_hwinit(priv);

	return 0;
}

static void sh_csi2_client_disconnect(struct sh_csi2 *priv)
{
	struct soc_camera_device *icd = (struct soc_camera_device *)priv->subdev.grp_id;

	priv->client = NULL;
	priv->subdev.grp_id = 0;

	/* Driver is about to be unbound */
	icd->ops->set_bus_param		= priv->set_bus_param;
	icd->ops->query_bus_param	= priv->query_bus_param;
	priv->set_bus_param		= NULL;
	priv->query_bus_param		= NULL;

	pm_runtime_put(v4l2_get_subdevdata(&priv->subdev));
}

static int sh_csi2_s_power(struct v4l2_subdev *sd, int on)
{
	struct sh_csi2 *priv = container_of(sd, struct sh_csi2, subdev);

	if (on)
		return sh_csi2_client_connect(priv);

	sh_csi2_client_disconnect(priv);
	return 0;
}

static struct v4l2_subdev_core_ops sh_csi2_subdev_core_ops = {
	.s_power	= sh_csi2_s_power,
};

static struct v4l2_subdev_ops sh_csi2_subdev_ops = {
	.core	= &sh_csi2_subdev_core_ops,
	.video	= &sh_csi2_subdev_video_ops,
};

static __devinit int sh_csi2_probe(struct platform_device *pdev)
{
	struct resource *res;
	unsigned int irq;
	int ret;
	struct sh_csi2 *priv;
	/* Platform data specify the PHY, lanes, ECC, CRC */
	struct sh_csi2_pdata *pdata = pdev->dev.platform_data;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	/* Interrupt unused so far */
	irq = platform_get_irq(pdev, 0);

	if (!res || (int)irq <= 0 || !pdata) {
		dev_err(&pdev->dev, "Not enough CSI2 platform resources.\n");
		return -ENODEV;
	}

	/* TODO: Add support for CSI2I. Careful: different register layout! */
	if (pdata->type != SH_CSI2C) {
		dev_err(&pdev->dev, "Only CSI2C supported ATM.\n");
		return -EINVAL;
	}

	priv = kzalloc(sizeof(struct sh_csi2), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	priv->irq = irq;

	if (!request_mem_region(res->start, resource_size(res), pdev->name)) {
		dev_err(&pdev->dev, "CSI2 register region already claimed\n");
		ret = -EBUSY;
		goto ereqreg;
	}

	priv->base = ioremap(res->start, resource_size(res));
	if (!priv->base) {
		ret = -ENXIO;
		dev_err(&pdev->dev, "Unable to ioremap CSI2 registers.\n");
		goto eremap;
	}

	priv->pdev = pdev;
	platform_set_drvdata(pdev, priv);

	v4l2_subdev_init(&priv->subdev, &sh_csi2_subdev_ops);
	v4l2_set_subdevdata(&priv->subdev, &pdev->dev);

	snprintf(priv->subdev.name, V4L2_SUBDEV_NAME_SIZE, "%s.mipi-csi",
		 dev_name(pdata->v4l2_dev->dev));
	ret = v4l2_device_register_subdev(pdata->v4l2_dev, &priv->subdev);
	dev_dbg(&pdev->dev, "%s(%p): ret(register_subdev) = %d\n", __func__, priv, ret);
	if (ret < 0)
		goto esdreg;

	pm_runtime_enable(&pdev->dev);

	dev_dbg(&pdev->dev, "CSI2 probed.\n");

	return 0;

esdreg:
	iounmap(priv->base);
eremap:
	release_mem_region(res->start, resource_size(res));
ereqreg:
	kfree(priv);

	return ret;
}

static __devexit int sh_csi2_remove(struct platform_device *pdev)
{
	struct sh_csi2 *priv = platform_get_drvdata(pdev);
	struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	v4l2_device_unregister_subdev(&priv->subdev);
	pm_runtime_disable(&pdev->dev);
	iounmap(priv->base);
	release_mem_region(res->start, resource_size(res));
	platform_set_drvdata(pdev, NULL);
	kfree(priv);

	return 0;
}

static struct platform_driver __refdata sh_csi2_pdrv = {
	.remove	= __devexit_p(sh_csi2_remove),
	.probe	= sh_csi2_probe,
	.driver	= {
		.name	= "sh-mobile-csi2",
		.owner	= THIS_MODULE,
	},
};

static int __init sh_csi2_init(void)
{
	return platform_driver_register(&sh_csi2_pdrv);
}

static void __exit sh_csi2_exit(void)
{
	platform_driver_unregister(&sh_csi2_pdrv);
}

module_init(sh_csi2_init);
module_exit(sh_csi2_exit);

MODULE_DESCRIPTION("SH-Mobile MIPI CSI-2 driver");
MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:sh-mobile-csi2");
Commit	Line	Data
077e2c10 GL	1	/*
	2	* Driver for the SH-Mobile MIPI CSI-2 unit
	3	*
	4	* Copyright (C) 2010, Guennadi Liakhovetski <g.liakhovetski@gmx.de>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*/
	10
	11	#include <linux/delay.h>
	12	#include <linux/i2c.h>
	13	#include <linux/io.h>
	14	#include <linux/platform_device.h>
	15	#include <linux/pm_runtime.h>
	16	#include <linux/slab.h>
	17	#include <linux/videodev2.h>
	18
6b526fed	19	#include <media/sh_mobile_ceu.h>
077e2c10 GL	20	#include <media/sh_mobile_csi2.h>
	21	#include <media/soc_camera.h>
	22	#include <media/v4l2-common.h>
	23	#include <media/v4l2-dev.h>
	24	#include <media/v4l2-device.h>
	25	#include <media/v4l2-mediabus.h>
	26	#include <media/v4l2-subdev.h>
	27
	28	#define SH_CSI2_TREF 0x00
	29	#define SH_CSI2_SRST 0x04
	30	#define SH_CSI2_PHYCNT 0x08
	31	#define SH_CSI2_CHKSUM 0x0C
	32	#define SH_CSI2_VCDT 0x10
	33
	34	struct sh_csi2 {
	35	struct v4l2_subdev subdev;
	36	struct list_head list;
077e2c10 GL	37	unsigned int irq;
	38	void __iomem *base;
	39	struct platform_device *pdev;
	40	struct sh_csi2_client_config *client;
cb743930 GL	41	unsigned long (query_bus_param)(struct soc_camera_device );
cb743930 GL	42	int (set_bus_param)(struct soc_camera_device , unsigned long);
077e2c10 GL	43	};
	44
	45	static int sh_csi2_try_fmt(struct v4l2_subdev *sd,
	46	struct v4l2_mbus_framefmt *mf)
	47	{
	48	struct sh_csi2 *priv = container_of(sd, struct sh_csi2, subdev);
	49	struct sh_csi2_pdata *pdata = priv->pdev->dev.platform_data;
	50
	51	if (mf->width > 8188)
	52	mf->width = 8188;
	53	else if (mf->width & 1)
	54	mf->width &= ~1;
	55
	56	switch (pdata->type) {
	57	case SH_CSI2C:
	58	switch (mf->code) {
	59	case V4L2_MBUS_FMT_UYVY8_2X8: /* YUV422 */
	60	case V4L2_MBUS_FMT_YUYV8_1_5X8: /* YUV420 */
07670433	61	case V4L2_MBUS_FMT_Y8_1X8: /* RAW8 */
077e2c10 GL	62	case V4L2_MBUS_FMT_SBGGR8_1X8:
	63	case V4L2_MBUS_FMT_SGRBG8_1X8:
	64	break;
	65	default:
	66	/* All MIPI CSI-2 devices must support one of primary formats */
	67	mf->code = V4L2_MBUS_FMT_YUYV8_2X8;
	68	}
	69	break;
	70	case SH_CSI2I:
	71	switch (mf->code) {
07670433	72	case V4L2_MBUS_FMT_Y8_1X8: /* RAW8 */
077e2c10 GL	73	case V4L2_MBUS_FMT_SBGGR8_1X8:
	74	case V4L2_MBUS_FMT_SGRBG8_1X8:
	75	case V4L2_MBUS_FMT_SBGGR10_1X10: /* RAW10 */
	76	case V4L2_MBUS_FMT_SBGGR12_1X12: /* RAW12 */
	77	break;
	78	default:
	79	/* All MIPI CSI-2 devices must support one of primary formats */
	80	mf->code = V4L2_MBUS_FMT_SBGGR8_1X8;
	81	}
	82	break;
	83	}
	84
	85	return 0;
	86	}
	87
	88	/*
	89	* We have done our best in try_fmt to try and tell the sensor, which formats
	90	* we support. If now the configuration is unsuitable for us we can only
	91	* error out.
	92	*/
	93	static int sh_csi2_s_fmt(struct v4l2_subdev *sd,
	94	struct v4l2_mbus_framefmt *mf)
	95	{
	96	struct sh_csi2 *priv = container_of(sd, struct sh_csi2, subdev);
	97	u32 tmp = (priv->client->channel & 3) << 8;
	98
	99	dev_dbg(sd->v4l2_dev->dev, "%s(%u)\n", __func__, mf->code);
	100	if (mf->width > 8188 \|\| mf->width & 1)
	101	return -EINVAL;
	102
	103	switch (mf->code) {
	104	case V4L2_MBUS_FMT_UYVY8_2X8:
	105	tmp \|= 0x1e; /* YUV422 8 bit */
	106	break;
	107	case V4L2_MBUS_FMT_YUYV8_1_5X8:
	108	tmp \|= 0x18; /* YUV420 8 bit */
	109	break;
	110	case V4L2_MBUS_FMT_RGB555_2X8_PADHI_BE:
	111	tmp \|= 0x21; /* RGB555 */
	112	break;
	113	case V4L2_MBUS_FMT_RGB565_2X8_BE:
	114	tmp \|= 0x22; /* RGB565 */
	115	break;
07670433	116	case V4L2_MBUS_FMT_Y8_1X8:
077e2c10 GL	117	case V4L2_MBUS_FMT_SBGGR8_1X8:
	118	case V4L2_MBUS_FMT_SGRBG8_1X8:
	119	tmp \|= 0x2a; /* RAW8 */
	120	break;
	121	default:
	122	return -EINVAL;
	123	}
	124
	125	iowrite32(tmp, priv->base + SH_CSI2_VCDT);
	126
	127	return 0;
	128	}
	129
	130	static struct v4l2_subdev_video_ops sh_csi2_subdev_video_ops = {
	131	.s_mbus_fmt = sh_csi2_s_fmt,
	132	.try_mbus_fmt = sh_csi2_try_fmt,
	133	};
	134
077e2c10 GL	135	static void sh_csi2_hwinit(struct sh_csi2 *priv)
	136	{
	137	struct sh_csi2_pdata *pdata = priv->pdev->dev.platform_data;
	138	__u32 tmp = 0x10; /* Enable MIPI CSI clock lane */
	139
	140	/* Reflect registers immediately */
	141	iowrite32(0x00000001, priv->base + SH_CSI2_TREF);
	142	/* reset CSI2 harware */
	143	iowrite32(0x00000001, priv->base + SH_CSI2_SRST);
	144	udelay(5);
	145	iowrite32(0x00000000, priv->base + SH_CSI2_SRST);
	146
	147	if (priv->client->lanes & 3)
	148	tmp \|= priv->client->lanes & 3;
	149	else
	150	/* Default - both lanes */
	151	tmp \|= 3;
	152
	153	if (priv->client->phy == SH_CSI2_PHY_MAIN)
	154	tmp \|= 0x8000;
	155
	156	iowrite32(tmp, priv->base + SH_CSI2_PHYCNT);
	157
	158	tmp = 0;
	159	if (pdata->flags & SH_CSI2_ECC)
	160	tmp \|= 2;
	161	if (pdata->flags & SH_CSI2_CRC)
	162	tmp \|= 1;
	163	iowrite32(tmp, priv->base + SH_CSI2_CHKSUM);
	164	}
	165
	166	static int sh_csi2_set_bus_param(struct soc_camera_device *icd,
	167	unsigned long flags)
	168	{
	169	return 0;
	170	}
	171
	172	static unsigned long sh_csi2_query_bus_param(struct soc_camera_device *icd)
	173	{
	174	struct soc_camera_link *icl = to_soc_camera_link(icd);
	175	const unsigned long flags = SOCAM_PCLK_SAMPLE_RISING \|
	176	SOCAM_HSYNC_ACTIVE_HIGH \| SOCAM_VSYNC_ACTIVE_HIGH \|
	177	SOCAM_MASTER \| SOCAM_DATAWIDTH_8 \| SOCAM_DATA_ACTIVE_HIGH;
	178
	179	return soc_camera_apply_sensor_flags(icl, flags);
	180	}
	181
6b526fed	182	static int sh_csi2_client_connect(struct sh_csi2 *priv)
077e2c10	183	{
077e2c10	184	struct sh_csi2_pdata *pdata = priv->pdev->dev.platform_data;
6b526fed GL	185	struct v4l2_subdev sd, csi2_sd = &priv->subdev;
	186	struct soc_camera_device *icd = NULL;
	187	struct device *dev = v4l2_get_subdevdata(&priv->subdev);
	188	int i;
	189
	190	v4l2_device_for_each_subdev(sd, csi2_sd->v4l2_dev)
	191	if (sd->grp_id) {
	192	icd = (struct soc_camera_device *)sd->grp_id;
	193	break;
	194	}
	195
	196	if (!icd)
	197	return -EINVAL;
077e2c10 GL	198
	199	for (i = 0; i < pdata->num_clients; i++)
	200	if (&pdata->clients[i].pdev->dev == icd->pdev)
	201	break;
	202
6b526fed	203	dev_dbg(dev, "%s(%p): found #%d\n", __func__, dev, i);
077e2c10 GL	204
077e2c10 GL	205	if (i == pdata->num_clients)
6b526fed	206	return -ENODEV;
077e2c10	207
6b526fed	208	priv->client = pdata->clients + i;
077e2c10	209
6b526fed GL	210	priv->set_bus_param = icd->ops->set_bus_param;
	211	priv->query_bus_param = icd->ops->query_bus_param;
	212	icd->ops->set_bus_param = sh_csi2_set_bus_param;
	213	icd->ops->query_bus_param = sh_csi2_query_bus_param;
077e2c10	214
6b526fed	215	csi2_sd->grp_id = (long)icd;
077e2c10	216
6b526fed	217	pm_runtime_get_sync(dev);
077e2c10	218
6b526fed	219	sh_csi2_hwinit(priv);
077e2c10	220
6b526fed GL	221	return 0;
6b526fed GL	222	}
077e2c10	223
6b526fed GL	224	static void sh_csi2_client_disconnect(struct sh_csi2 *priv)
	225	{
	226	struct soc_camera_device icd = (struct soc_camera_device )priv->subdev.grp_id;
077e2c10	227
6b526fed GL	228	priv->client = NULL;
6b526fed GL	229	priv->subdev.grp_id = 0;
077e2c10	230
6b526fed GL	231	/* Driver is about to be unbound */
	232	icd->ops->set_bus_param = priv->set_bus_param;
	233	icd->ops->query_bus_param = priv->query_bus_param;
	234	priv->set_bus_param = NULL;
	235	priv->query_bus_param = NULL;
	236
	237	pm_runtime_put(v4l2_get_subdevdata(&priv->subdev));
077e2c10 GL	238	}
077e2c10 GL	239
6b526fed GL	240	static int sh_csi2_s_power(struct v4l2_subdev *sd, int on)
	241	{
	242	struct sh_csi2 *priv = container_of(sd, struct sh_csi2, subdev);
	243
	244	if (on)
	245	return sh_csi2_client_connect(priv);
	246
	247	sh_csi2_client_disconnect(priv);
	248	return 0;
	249	}
	250
	251	static struct v4l2_subdev_core_ops sh_csi2_subdev_core_ops = {
	252	.s_power = sh_csi2_s_power,
	253	};
	254
	255	static struct v4l2_subdev_ops sh_csi2_subdev_ops = {
	256	.core = &sh_csi2_subdev_core_ops,
	257	.video = &sh_csi2_subdev_video_ops,
	258	};
	259
077e2c10 GL	260	static __devinit int sh_csi2_probe(struct platform_device *pdev)
	261	{
	262	struct resource *res;
	263	unsigned int irq;
	264	int ret;
	265	struct sh_csi2 *priv;
	266	/* Platform data specify the PHY, lanes, ECC, CRC */
	267	struct sh_csi2_pdata *pdata = pdev->dev.platform_data;
	268
	269	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	270	/* Interrupt unused so far */
	271	irq = platform_get_irq(pdev, 0);
	272
	273	if (!res \|\| (int)irq <= 0 \|\| !pdata) {
	274	dev_err(&pdev->dev, "Not enough CSI2 platform resources.\n");
	275	return -ENODEV;
	276	}
	277
	278	/* TODO: Add support for CSI2I. Careful: different register layout! */
	279	if (pdata->type != SH_CSI2C) {
	280	dev_err(&pdev->dev, "Only CSI2C supported ATM.\n");
	281	return -EINVAL;
	282	}
	283
	284	priv = kzalloc(sizeof(struct sh_csi2), GFP_KERNEL);
	285	if (!priv)
	286	return -ENOMEM;
	287
	288	priv->irq = irq;
077e2c10 GL	289
	290	if (!request_mem_region(res->start, resource_size(res), pdev->name)) {
	291	dev_err(&pdev->dev, "CSI2 register region already claimed\n");
	292	ret = -EBUSY;
	293	goto ereqreg;
	294	}
	295
	296	priv->base = ioremap(res->start, resource_size(res));
	297	if (!priv->base) {
	298	ret = -ENXIO;
	299	dev_err(&pdev->dev, "Unable to ioremap CSI2 registers.\n");
	300	goto eremap;
	301	}
	302
	303	priv->pdev = pdev;
6b526fed	304	platform_set_drvdata(pdev, priv);
077e2c10 GL	305
	306	v4l2_subdev_init(&priv->subdev, &sh_csi2_subdev_ops);
	307	v4l2_set_subdevdata(&priv->subdev, &pdev->dev);
	308
6b526fed GL	309	snprintf(priv->subdev.name, V4L2_SUBDEV_NAME_SIZE, "%s.mipi-csi",
	310	dev_name(pdata->v4l2_dev->dev));
	311	ret = v4l2_device_register_subdev(pdata->v4l2_dev, &priv->subdev);
	312	dev_dbg(&pdev->dev, "%s(%p): ret(register_subdev) = %d\n", __func__, priv, ret);
	313	if (ret < 0)
	314	goto esdreg;
077e2c10 GL	315
	316	pm_runtime_enable(&pdev->dev);
	317
	318	dev_dbg(&pdev->dev, "CSI2 probed.\n");
	319
	320	return 0;
	321
6b526fed GL	322	esdreg:
6b526fed GL	323	iounmap(priv->base);
077e2c10 GL	324	eremap:
	325	release_mem_region(res->start, resource_size(res));
	326	ereqreg:
077e2c10 GL	327	kfree(priv);
	328
	329	return ret;
	330	}
	331
	332	static __devexit int sh_csi2_remove(struct platform_device *pdev)
	333	{
	334	struct sh_csi2 *priv = platform_get_drvdata(pdev);
	335	struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	336
6b526fed	337	v4l2_device_unregister_subdev(&priv->subdev);
077e2c10 GL	338	pm_runtime_disable(&pdev->dev);
	339	iounmap(priv->base);
	340	release_mem_region(res->start, resource_size(res));
	341	platform_set_drvdata(pdev, NULL);
	342	kfree(priv);
	343
	344	return 0;
	345	}
	346
	347	static struct platform_driver __refdata sh_csi2_pdrv = {
6b526fed GL	348	.remove = __devexit_p(sh_csi2_remove),
	349	.probe = sh_csi2_probe,
	350	.driver = {
077e2c10 GL	351	.name = "sh-mobile-csi2",
	352	.owner = THIS_MODULE,
	353	},
	354	};
	355
	356	static int __init sh_csi2_init(void)
	357	{
6b526fed	358	return platform_driver_register(&sh_csi2_pdrv);
077e2c10 GL	359	}
	360
	361	static void __exit sh_csi2_exit(void)
	362	{
	363	platform_driver_unregister(&sh_csi2_pdrv);
	364	}
	365
	366	module_init(sh_csi2_init);
	367	module_exit(sh_csi2_exit);
	368
	369	MODULE_DESCRIPTION("SH-Mobile MIPI CSI-2 driver");
	370	MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
	371	MODULE_LICENSE("GPL v2");
	372	MODULE_ALIAS("platform:sh-mobile-csi2");