[deliverable/linux.git] / drivers / media / platform / soc_camera / 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/err.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 <linux/module.h>

#include <media/sh_mobile_ceu.h>
#include <media/sh_mobile_csi2.h>
#include <media/soc_camera.h>
#include <media/soc_mediabus.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;
	unsigned int			irq;
	unsigned long			mipi_flags;
	void __iomem			*base;
	struct platform_device		*pdev;
	struct sh_csi2_client_config	*client;
};

static void sh_csi2_hwinit(struct sh_csi2 *priv);

static int sh_csi2_set_fmt(struct v4l2_subdev *sd,
		struct v4l2_subdev_pad_config *cfg,
		struct v4l2_subdev_format *format)
{
	struct sh_csi2 *priv = container_of(sd, struct sh_csi2, subdev);
	struct sh_csi2_pdata *pdata = priv->pdev->dev.platform_data;
	struct v4l2_mbus_framefmt *mf = &format->format;
	u32 tmp = (priv->client->channel & 3) << 8;

	if (format->pad)
		return -EINVAL;

	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 MEDIA_BUS_FMT_UYVY8_2X8:		/* YUV422 */
		case MEDIA_BUS_FMT_YUYV8_1_5X8:		/* YUV420 */
		case MEDIA_BUS_FMT_Y8_1X8:		/* RAW8 */
		case MEDIA_BUS_FMT_SBGGR8_1X8:
		case MEDIA_BUS_FMT_SGRBG8_1X8:
			break;
		default:
			/* All MIPI CSI-2 devices must support one of primary formats */
			mf->code = MEDIA_BUS_FMT_YUYV8_2X8;
		}
		break;
	case SH_CSI2I:
		switch (mf->code) {
		case MEDIA_BUS_FMT_Y8_1X8:		/* RAW8 */
		case MEDIA_BUS_FMT_SBGGR8_1X8:
		case MEDIA_BUS_FMT_SGRBG8_1X8:
		case MEDIA_BUS_FMT_SBGGR10_1X10:	/* RAW10 */
		case MEDIA_BUS_FMT_SBGGR12_1X12:	/* RAW12 */
			break;
		default:
			/* All MIPI CSI-2 devices must support one of primary formats */
			mf->code = MEDIA_BUS_FMT_SBGGR8_1X8;
		}
		break;
	}

	if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
		cfg->try_fmt = *mf;
		return 0;
	}

	if (mf->width > 8188 || mf->width & 1)
		return -EINVAL;

	switch (mf->code) {
	case MEDIA_BUS_FMT_UYVY8_2X8:
		tmp |= 0x1e;	/* YUV422 8 bit */
		break;
	case MEDIA_BUS_FMT_YUYV8_1_5X8:
		tmp |= 0x18;	/* YUV420 8 bit */
		break;
	case MEDIA_BUS_FMT_RGB555_2X8_PADHI_BE:
		tmp |= 0x21;	/* RGB555 */
		break;
	case MEDIA_BUS_FMT_RGB565_2X8_BE:
		tmp |= 0x22;	/* RGB565 */
		break;
	case MEDIA_BUS_FMT_Y8_1X8:
	case MEDIA_BUS_FMT_SBGGR8_1X8:
	case MEDIA_BUS_FMT_SGRBG8_1X8:
		tmp |= 0x2a;	/* RAW8 */
		break;
	default:
		return -EINVAL;
	}

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

	return 0;
}

static int sh_csi2_g_mbus_config(struct v4l2_subdev *sd,
				 struct v4l2_mbus_config *cfg)
{
	struct sh_csi2 *priv = container_of(sd, struct sh_csi2, subdev);

	if (!priv->mipi_flags) {
		struct soc_camera_device *icd = v4l2_get_subdev_hostdata(sd);
		struct v4l2_subdev *client_sd = soc_camera_to_subdev(icd);
		struct sh_csi2_pdata *pdata = priv->pdev->dev.platform_data;
		unsigned long common_flags, csi2_flags;
		struct v4l2_mbus_config client_cfg = {.type = V4L2_MBUS_CSI2,};
		int ret;

		/* Check if we can support this camera */
		csi2_flags = V4L2_MBUS_CSI2_CONTINUOUS_CLOCK |
			V4L2_MBUS_CSI2_1_LANE;

		switch (pdata->type) {
		case SH_CSI2C:
			if (priv->client->lanes != 1)
				csi2_flags |= V4L2_MBUS_CSI2_2_LANE;
			break;
		case SH_CSI2I:
			switch (priv->client->lanes) {
			default:
				csi2_flags |= V4L2_MBUS_CSI2_4_LANE;
			case 3:
				csi2_flags |= V4L2_MBUS_CSI2_3_LANE;
			case 2:
				csi2_flags |= V4L2_MBUS_CSI2_2_LANE;
			}
		}

		ret = v4l2_subdev_call(client_sd, video, g_mbus_config, &client_cfg);
		if (ret == -ENOIOCTLCMD)
			common_flags = csi2_flags;
		else if (!ret)
			common_flags = soc_mbus_config_compatible(&client_cfg,
								  csi2_flags);
		else
			common_flags = 0;

		if (!common_flags)
			return -EINVAL;

		/* All good: camera MIPI configuration supported */
		priv->mipi_flags = common_flags;
	}

	if (cfg) {
		cfg->flags = V4L2_MBUS_PCLK_SAMPLE_RISING |
			V4L2_MBUS_HSYNC_ACTIVE_HIGH | V4L2_MBUS_VSYNC_ACTIVE_HIGH |
			V4L2_MBUS_MASTER | V4L2_MBUS_DATA_ACTIVE_HIGH;
		cfg->type = V4L2_MBUS_PARALLEL;
	}

	return 0;
}

static int sh_csi2_s_mbus_config(struct v4l2_subdev *sd,
				 const struct v4l2_mbus_config *cfg)
{
	struct sh_csi2 *priv = container_of(sd, struct sh_csi2, subdev);
	struct soc_camera_device *icd = v4l2_get_subdev_hostdata(sd);
	struct v4l2_subdev *client_sd = soc_camera_to_subdev(icd);
	struct v4l2_mbus_config client_cfg = {.type = V4L2_MBUS_CSI2,};
	int ret = sh_csi2_g_mbus_config(sd, NULL);

	if (ret < 0)
		return ret;

	pm_runtime_get_sync(&priv->pdev->dev);

	sh_csi2_hwinit(priv);

	client_cfg.flags = priv->mipi_flags;

	return v4l2_subdev_call(client_sd, video, s_mbus_config, &client_cfg);
}

static struct v4l2_subdev_video_ops sh_csi2_subdev_video_ops = {
	.g_mbus_config	= sh_csi2_g_mbus_config,
	.s_mbus_config	= sh_csi2_s_mbus_config,
};

static struct v4l2_subdev_pad_ops sh_csi2_subdev_pad_ops = {
	.set_fmt	= sh_csi2_set_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);

	switch (pdata->type) {
	case SH_CSI2C:
		if (priv->client->lanes == 1)
			tmp |= 1;
		else
			/* Default - both lanes */
			tmp |= 3;
		break;
	case SH_CSI2I:
		if (!priv->client->lanes || priv->client->lanes > 4)
			/* Default - all 4 lanes */
			tmp |= 0xf;
		else
			tmp |= (1 << priv->client->lanes) - 1;
	}

	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_client_connect(struct sh_csi2 *priv)
{
	struct device *dev = v4l2_get_subdevdata(&priv->subdev);
	struct sh_csi2_pdata *pdata = dev->platform_data;
	struct soc_camera_device *icd = v4l2_get_subdev_hostdata(&priv->subdev);
	int i;

	if (priv->client)
		return -EBUSY;

	for (i = 0; i < pdata->num_clients; i++)
		if ((pdata->clients[i].pdev &&
		     &pdata->clients[i].pdev->dev == icd->pdev) ||
		    (icd->control &&
		     strcmp(pdata->clients[i].name, dev_name(icd->control))))
			break;

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

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

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

	return 0;
}

static void sh_csi2_client_disconnect(struct sh_csi2 *priv)
{
	if (!priv->client)
		return;

	priv->client = 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,
	.pad	= &sh_csi2_subdev_pad_ops,
};

static 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;

	if (!pdata)
		return -EINVAL;

	priv = devm_kzalloc(&pdev->dev, sizeof(struct sh_csi2), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

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

	if (!res || (int)irq <= 0) {
		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->irq = irq;

	priv->base = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(priv->base))
		return PTR_ERR(priv->base);

	priv->pdev = pdev;
	priv->subdev.owner = THIS_MODULE;
	priv->subdev.dev = &pdev->dev;
	platform_set_drvdata(pdev, &priv->subdev);

	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(&pdev->dev));

	ret = v4l2_async_register_subdev(&priv->subdev);
	if (ret < 0)
		return ret;

	pm_runtime_enable(&pdev->dev);

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

	return 0;
}

static int sh_csi2_remove(struct platform_device *pdev)
{
	struct v4l2_subdev *subdev = platform_get_drvdata(pdev);
	struct sh_csi2 *priv = container_of(subdev, struct sh_csi2, subdev);

	v4l2_async_unregister_subdev(&priv->subdev);
	pm_runtime_disable(&pdev->dev);

	return 0;
}

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

module_platform_driver(sh_csi2_pdrv);

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>
2e2d612d	12	#include <linux/err.h>
077e2c10 GL	13	#include <linux/i2c.h>
	14	#include <linux/io.h>
	15	#include <linux/platform_device.h>
	16	#include <linux/pm_runtime.h>
	17	#include <linux/slab.h>
	18	#include <linux/videodev2.h>
7a707b89	19	#include <linux/module.h>
077e2c10	20
6b526fed	21	#include <media/sh_mobile_ceu.h>
077e2c10 GL	22	#include <media/sh_mobile_csi2.h>
077e2c10 GL	23	#include <media/soc_camera.h>
f836c628	24	#include <media/soc_mediabus.h>
077e2c10 GL	25	#include <media/v4l2-common.h>
	26	#include <media/v4l2-dev.h>
	27	#include <media/v4l2-device.h>
	28	#include <media/v4l2-mediabus.h>
	29	#include <media/v4l2-subdev.h>
	30
	31	#define SH_CSI2_TREF 0x00
	32	#define SH_CSI2_SRST 0x04
	33	#define SH_CSI2_PHYCNT 0x08
	34	#define SH_CSI2_CHKSUM 0x0C
	35	#define SH_CSI2_VCDT 0x10
	36
	37	struct sh_csi2 {
	38	struct v4l2_subdev subdev;
077e2c10	39	unsigned int irq;
022e52cf	40	unsigned long mipi_flags;
077e2c10 GL	41	void __iomem *base;
	42	struct platform_device *pdev;
	43	struct sh_csi2_client_config *client;
	44	};
	45
676d2d4f GL	46	static void sh_csi2_hwinit(struct sh_csi2 *priv);
676d2d4f GL	47
717fd5b4 HV	48	static int sh_csi2_set_fmt(struct v4l2_subdev *sd,
	49	struct v4l2_subdev_pad_config *cfg,
	50	struct v4l2_subdev_format *format)
077e2c10 GL	51	{
	52	struct sh_csi2 *priv = container_of(sd, struct sh_csi2, subdev);
	53	struct sh_csi2_pdata *pdata = priv->pdev->dev.platform_data;
717fd5b4 HV	54	struct v4l2_mbus_framefmt *mf = &format->format;
	55	u32 tmp = (priv->client->channel & 3) << 8;
	56
	57	if (format->pad)
	58	return -EINVAL;
077e2c10 GL	59
	60	if (mf->width > 8188)
	61	mf->width = 8188;
	62	else if (mf->width & 1)
	63	mf->width &= ~1;
	64
	65	switch (pdata->type) {
	66	case SH_CSI2C:
	67	switch (mf->code) {
27ffaeb0 BB	68	case MEDIA_BUS_FMT_UYVY8_2X8: /* YUV422 */
	69	case MEDIA_BUS_FMT_YUYV8_1_5X8: /* YUV420 */
	70	case MEDIA_BUS_FMT_Y8_1X8: /* RAW8 */
	71	case MEDIA_BUS_FMT_SBGGR8_1X8:
	72	case MEDIA_BUS_FMT_SGRBG8_1X8:
077e2c10 GL	73	break;
	74	default:
	75	/* All MIPI CSI-2 devices must support one of primary formats */
27ffaeb0	76	mf->code = MEDIA_BUS_FMT_YUYV8_2X8;
077e2c10 GL	77	}
	78	break;
	79	case SH_CSI2I:
	80	switch (mf->code) {
27ffaeb0 BB	81	case MEDIA_BUS_FMT_Y8_1X8: /* RAW8 */
	82	case MEDIA_BUS_FMT_SBGGR8_1X8:
	83	case MEDIA_BUS_FMT_SGRBG8_1X8:
	84	case MEDIA_BUS_FMT_SBGGR10_1X10: /* RAW10 */
	85	case MEDIA_BUS_FMT_SBGGR12_1X12: /* RAW12 */
077e2c10 GL	86	break;
	87	default:
	88	/* All MIPI CSI-2 devices must support one of primary formats */
27ffaeb0	89	mf->code = MEDIA_BUS_FMT_SBGGR8_1X8;
077e2c10 GL	90	}
	91	break;
	92	}
	93
717fd5b4 HV	94	if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
	95	cfg->try_fmt = *mf;
	96	return 0;
	97	}
077e2c10	98
077e2c10 GL	99	if (mf->width > 8188 \|\| mf->width & 1)
	100	return -EINVAL;
	101
	102	switch (mf->code) {
27ffaeb0	103	case MEDIA_BUS_FMT_UYVY8_2X8:
077e2c10 GL	104	tmp \|= 0x1e; /* YUV422 8 bit */
077e2c10 GL	105	break;
27ffaeb0	106	case MEDIA_BUS_FMT_YUYV8_1_5X8:
077e2c10 GL	107	tmp \|= 0x18; /* YUV420 8 bit */
077e2c10 GL	108	break;
27ffaeb0	109	case MEDIA_BUS_FMT_RGB555_2X8_PADHI_BE:
077e2c10 GL	110	tmp \|= 0x21; /* RGB555 */
077e2c10 GL	111	break;
27ffaeb0	112	case MEDIA_BUS_FMT_RGB565_2X8_BE:
077e2c10 GL	113	tmp \|= 0x22; /* RGB565 */
077e2c10 GL	114	break;
27ffaeb0 BB	115	case MEDIA_BUS_FMT_Y8_1X8:
	116	case MEDIA_BUS_FMT_SBGGR8_1X8:
	117	case MEDIA_BUS_FMT_SGRBG8_1X8:
077e2c10 GL	118	tmp \|= 0x2a; /* RAW8 */
	119	break;
	120	default:
	121	return -EINVAL;
	122	}
	123
	124	iowrite32(tmp, priv->base + SH_CSI2_VCDT);
	125
	126	return 0;
	127	}
	128
022e52cf GL	129	static int sh_csi2_g_mbus_config(struct v4l2_subdev *sd,
	130	struct v4l2_mbus_config *cfg)
	131	{
676d2d4f GL	132	struct sh_csi2 *priv = container_of(sd, struct sh_csi2, subdev);
	133
	134	if (!priv->mipi_flags) {
	135	struct soc_camera_device *icd = v4l2_get_subdev_hostdata(sd);
	136	struct v4l2_subdev *client_sd = soc_camera_to_subdev(icd);
	137	struct sh_csi2_pdata *pdata = priv->pdev->dev.platform_data;
	138	unsigned long common_flags, csi2_flags;
	139	struct v4l2_mbus_config client_cfg = {.type = V4L2_MBUS_CSI2,};
	140	int ret;
	141
	142	/* Check if we can support this camera */
	143	csi2_flags = V4L2_MBUS_CSI2_CONTINUOUS_CLOCK \|
	144	V4L2_MBUS_CSI2_1_LANE;
	145
	146	switch (pdata->type) {
	147	case SH_CSI2C:
	148	if (priv->client->lanes != 1)
	149	csi2_flags \|= V4L2_MBUS_CSI2_2_LANE;
	150	break;
	151	case SH_CSI2I:
	152	switch (priv->client->lanes) {
	153	default:
	154	csi2_flags \|= V4L2_MBUS_CSI2_4_LANE;
	155	case 3:
	156	csi2_flags \|= V4L2_MBUS_CSI2_3_LANE;
	157	case 2:
	158	csi2_flags \|= V4L2_MBUS_CSI2_2_LANE;
	159	}
	160	}
	161
	162	ret = v4l2_subdev_call(client_sd, video, g_mbus_config, &client_cfg);
	163	if (ret == -ENOIOCTLCMD)
	164	common_flags = csi2_flags;
	165	else if (!ret)
	166	common_flags = soc_mbus_config_compatible(&client_cfg,
	167	csi2_flags);
	168	else
	169	common_flags = 0;
	170
	171	if (!common_flags)
	172	return -EINVAL;
	173
	174	/* All good: camera MIPI configuration supported */
	175	priv->mipi_flags = common_flags;
	176	}
	177
	178	if (cfg) {
	179	cfg->flags = V4L2_MBUS_PCLK_SAMPLE_RISING \|
	180	V4L2_MBUS_HSYNC_ACTIVE_HIGH \| V4L2_MBUS_VSYNC_ACTIVE_HIGH \|
	181	V4L2_MBUS_MASTER \| V4L2_MBUS_DATA_ACTIVE_HIGH;
	182	cfg->type = V4L2_MBUS_PARALLEL;
	183	}
022e52cf GL	184
	185	return 0;
	186	}
	187
	188	static int sh_csi2_s_mbus_config(struct v4l2_subdev *sd,
	189	const struct v4l2_mbus_config *cfg)
	190	{
	191	struct sh_csi2 *priv = container_of(sd, struct sh_csi2, subdev);
4c0b036d	192	struct soc_camera_device *icd = v4l2_get_subdev_hostdata(sd);
022e52cf	193	struct v4l2_subdev *client_sd = soc_camera_to_subdev(icd);
676d2d4f GL	194	struct v4l2_mbus_config client_cfg = {.type = V4L2_MBUS_CSI2,};
	195	int ret = sh_csi2_g_mbus_config(sd, NULL);
	196
	197	if (ret < 0)
	198	return ret;
	199
	200	pm_runtime_get_sync(&priv->pdev->dev);
	201
	202	sh_csi2_hwinit(priv);
	203
	204	client_cfg.flags = priv->mipi_flags;
022e52cf GL	205
	206	return v4l2_subdev_call(client_sd, video, s_mbus_config, &client_cfg);
	207	}
	208
077e2c10	209	static struct v4l2_subdev_video_ops sh_csi2_subdev_video_ops = {
022e52cf GL	210	.g_mbus_config = sh_csi2_g_mbus_config,
022e52cf GL	211	.s_mbus_config = sh_csi2_s_mbus_config,
077e2c10 GL	212	};
077e2c10 GL	213
717fd5b4 HV	214	static struct v4l2_subdev_pad_ops sh_csi2_subdev_pad_ops = {
	215	.set_fmt = sh_csi2_set_fmt,
	216	};
	217
077e2c10 GL	218	static void sh_csi2_hwinit(struct sh_csi2 *priv)
	219	{
	220	struct sh_csi2_pdata *pdata = priv->pdev->dev.platform_data;
	221	__u32 tmp = 0x10; /* Enable MIPI CSI clock lane */
	222
	223	/* Reflect registers immediately */
	224	iowrite32(0x00000001, priv->base + SH_CSI2_TREF);
	225	/* reset CSI2 harware */
	226	iowrite32(0x00000001, priv->base + SH_CSI2_SRST);
	227	udelay(5);
	228	iowrite32(0x00000000, priv->base + SH_CSI2_SRST);
	229
f836c628 GL	230	switch (pdata->type) {
	231	case SH_CSI2C:
	232	if (priv->client->lanes == 1)
	233	tmp \|= 1;
	234	else
	235	/* Default - both lanes */
	236	tmp \|= 3;
	237	break;
	238	case SH_CSI2I:
	239	if (!priv->client->lanes \|\| priv->client->lanes > 4)
	240	/* Default - all 4 lanes */
	241	tmp \|= 0xf;
	242	else
	243	tmp \|= (1 << priv->client->lanes) - 1;
	244	}
077e2c10 GL	245
	246	if (priv->client->phy == SH_CSI2_PHY_MAIN)
	247	tmp \|= 0x8000;
	248
	249	iowrite32(tmp, priv->base + SH_CSI2_PHYCNT);
	250
	251	tmp = 0;
	252	if (pdata->flags & SH_CSI2_ECC)
	253	tmp \|= 2;
	254	if (pdata->flags & SH_CSI2_CRC)
	255	tmp \|= 1;
	256	iowrite32(tmp, priv->base + SH_CSI2_CHKSUM);
	257	}
	258
6b526fed	259	static int sh_csi2_client_connect(struct sh_csi2 *priv)
077e2c10	260	{
6b526fed	261	struct device *dev = v4l2_get_subdevdata(&priv->subdev);
676d2d4f GL	262	struct sh_csi2_pdata *pdata = dev->platform_data;
	263	struct soc_camera_device *icd = v4l2_get_subdev_hostdata(&priv->subdev);
	264	int i;
6b526fed	265
2fbdc9bd GL	266	if (priv->client)
	267	return -EBUSY;
	268
077e2c10	269	for (i = 0; i < pdata->num_clients; i++)
676d2d4f GL	270	if ((pdata->clients[i].pdev &&
	271	&pdata->clients[i].pdev->dev == icd->pdev) \|\|
	272	(icd->control &&
	273	strcmp(pdata->clients[i].name, dev_name(icd->control))))
077e2c10 GL	274	break;
077e2c10 GL	275
6b526fed	276	dev_dbg(dev, "%s(%p): found #%d\n", __func__, dev, i);
077e2c10 GL	277
077e2c10 GL	278	if (i == pdata->num_clients)
6b526fed	279	return -ENODEV;
077e2c10	280
6b526fed	281	priv->client = pdata->clients + i;
077e2c10	282
6b526fed GL	283	return 0;
6b526fed GL	284	}
077e2c10	285
6b526fed GL	286	static void sh_csi2_client_disconnect(struct sh_csi2 *priv)
6b526fed GL	287	{
2fbdc9bd GL	288	if (!priv->client)
	289	return;
	290
6b526fed	291	priv->client = NULL;
077e2c10	292
6b526fed	293	pm_runtime_put(v4l2_get_subdevdata(&priv->subdev));
077e2c10 GL	294	}
077e2c10 GL	295
6b526fed GL	296	static int sh_csi2_s_power(struct v4l2_subdev *sd, int on)
	297	{
	298	struct sh_csi2 *priv = container_of(sd, struct sh_csi2, subdev);
	299
	300	if (on)
	301	return sh_csi2_client_connect(priv);
	302
	303	sh_csi2_client_disconnect(priv);
	304	return 0;
	305	}
	306
	307	static struct v4l2_subdev_core_ops sh_csi2_subdev_core_ops = {
	308	.s_power = sh_csi2_s_power,
	309	};
	310
	311	static struct v4l2_subdev_ops sh_csi2_subdev_ops = {
	312	.core = &sh_csi2_subdev_core_ops,
	313	.video = &sh_csi2_subdev_video_ops,
717fd5b4	314	.pad = &sh_csi2_subdev_pad_ops,
6b526fed GL	315	};
6b526fed GL	316
4c62e976	317	static int sh_csi2_probe(struct platform_device *pdev)
077e2c10 GL	318	{
	319	struct resource *res;
	320	unsigned int irq;
	321	int ret;
	322	struct sh_csi2 *priv;
	323	/* Platform data specify the PHY, lanes, ECC, CRC */
	324	struct sh_csi2_pdata *pdata = pdev->dev.platform_data;
	325
676d2d4f GL	326	if (!pdata)
	327	return -EINVAL;
	328
	329	priv = devm_kzalloc(&pdev->dev, sizeof(struct sh_csi2), GFP_KERNEL);
	330	if (!priv)
	331	return -ENOMEM;
	332
077e2c10 GL	333	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	334	/* Interrupt unused so far */
	335	irq = platform_get_irq(pdev, 0);
	336
676d2d4f	337	if (!res \|\| (int)irq <= 0) {
077e2c10 GL	338	dev_err(&pdev->dev, "Not enough CSI2 platform resources.\n");
	339	return -ENODEV;
	340	}
	341
	342	/* TODO: Add support for CSI2I. Careful: different register layout! */
	343	if (pdata->type != SH_CSI2C) {
	344	dev_err(&pdev->dev, "Only CSI2C supported ATM.\n");
	345	return -EINVAL;
	346	}
	347
077e2c10	348	priv->irq = irq;
077e2c10	349
2e2d612d SK	350	priv->base = devm_ioremap_resource(&pdev->dev, res);
	351	if (IS_ERR(priv->base))
	352	return PTR_ERR(priv->base);
077e2c10 GL	353
077e2c10 GL	354	priv->pdev = pdev;
676d2d4f GL	355	priv->subdev.owner = THIS_MODULE;
	356	priv->subdev.dev = &pdev->dev;
	357	platform_set_drvdata(pdev, &priv->subdev);
077e2c10 GL	358
	359	v4l2_subdev_init(&priv->subdev, &sh_csi2_subdev_ops);
	360	v4l2_set_subdevdata(&priv->subdev, &pdev->dev);
	361
6b526fed	362	snprintf(priv->subdev.name, V4L2_SUBDEV_NAME_SIZE, "%s.mipi-csi",
676d2d4f GL	363	dev_name(&pdev->dev));
	364
	365	ret = v4l2_async_register_subdev(&priv->subdev);
6b526fed	366	if (ret < 0)
721110b3	367	return ret;
077e2c10 GL	368
	369	pm_runtime_enable(&pdev->dev);
	370
	371	dev_dbg(&pdev->dev, "CSI2 probed.\n");
	372
	373	return 0;
077e2c10 GL	374	}
077e2c10 GL	375
4c62e976	376	static int sh_csi2_remove(struct platform_device *pdev)
077e2c10	377	{
676d2d4f GL	378	struct v4l2_subdev *subdev = platform_get_drvdata(pdev);
676d2d4f GL	379	struct sh_csi2 *priv = container_of(subdev, struct sh_csi2, subdev);
077e2c10	380
676d2d4f	381	v4l2_async_unregister_subdev(&priv->subdev);
077e2c10	382	pm_runtime_disable(&pdev->dev);
077e2c10 GL	383
	384	return 0;
	385	}
	386
	387	static struct platform_driver __refdata sh_csi2_pdrv = {
4c62e976	388	.remove = sh_csi2_remove,
6b526fed GL	389	.probe = sh_csi2_probe,
6b526fed GL	390	.driver = {
077e2c10	391	.name = "sh-mobile-csi2",
077e2c10 GL	392	},
	393	};
	394
1d6629b1	395	module_platform_driver(sh_csi2_pdrv);
077e2c10 GL	396
	397	MODULE_DESCRIPTION("SH-Mobile MIPI CSI-2 driver");
	398	MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
	399	MODULE_LICENSE("GPL v2");
	400	MODULE_ALIAS("platform:sh-mobile-csi2");