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V4L/DVB: V4L2: soc-camera: add a MIPI CSI-2 driver for SH-Mobile plat…
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…forms

Some SH-Mobile SoCs implement a MIPI CSI-2 controller, that can interface to
several video clients and send data to the CEU or to the Image Signal
Processor.  This patch implements a v4l2-subdevice driver for CSI-2 to be used
within the soc-camera framework, implementing the second subdevice in addition
to the actual video clients.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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Guennadi Liakhovetski authored and Mauro Carvalho Chehab committed Aug 2, 2010
1 parent 52d268a commit 077e2c1
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6 changes: 6 additions & 0 deletions drivers/media/video/Kconfig
Original file line number Diff line number Diff line change
Expand Up @@ -876,6 +876,12 @@ config VIDEO_PXA27x
---help---
This is a v4l2 driver for the PXA27x Quick Capture Interface

config VIDEO_SH_MOBILE_CSI2
tristate "SuperH Mobile MIPI CSI-2 Interface driver"
depends on VIDEO_DEV && SOC_CAMERA && HAVE_CLK
---help---
This is a v4l2 driver for the SuperH MIPI CSI-2 Interface

config VIDEO_SH_MOBILE_CEU
tristate "SuperH Mobile CEU Interface driver"
depends on VIDEO_DEV && SOC_CAMERA && HAS_DMA && HAVE_CLK
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1 change: 1 addition & 0 deletions drivers/media/video/Makefile
Original file line number Diff line number Diff line change
Expand Up @@ -160,6 +160,7 @@ obj-$(CONFIG_SOC_CAMERA_PLATFORM) += soc_camera_platform.o
obj-$(CONFIG_VIDEO_MX1) += mx1_camera.o
obj-$(CONFIG_VIDEO_MX3) += mx3_camera.o
obj-$(CONFIG_VIDEO_PXA27x) += pxa_camera.o
obj-$(CONFIG_VIDEO_SH_MOBILE_CSI2) += sh_mobile_csi2.o
obj-$(CONFIG_VIDEO_SH_MOBILE_CEU) += sh_mobile_ceu_camera.o

obj-$(CONFIG_ARCH_DAVINCI) += davinci/
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354 changes: 354 additions & 0 deletions drivers/media/video/sh_mobile_csi2.c
Original file line number Diff line number Diff line change
@@ -0,0 +1,354 @@
/*
* 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_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;
struct notifier_block notifier;
unsigned int irq;
void __iomem *base;
struct platform_device *pdev;
struct sh_csi2_client_config *client;
};

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_GREY8_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_GREY8_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_GREY8_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 struct v4l2_subdev_core_ops sh_csi2_subdev_core_ops;

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

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_notify(struct notifier_block *nb,
unsigned long action, void *data)
{
struct device *dev = data;
struct soc_camera_device *icd = to_soc_camera_dev(dev);
struct v4l2_device *v4l2_dev = dev_get_drvdata(dev->parent);
struct sh_csi2 *priv =
container_of(nb, struct sh_csi2, notifier);
struct sh_csi2_pdata *pdata = priv->pdev->dev.platform_data;
int ret, i;

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

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

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

switch (action) {
case BUS_NOTIFY_BOUND_DRIVER:
snprintf(priv->subdev.name, V4L2_SUBDEV_NAME_SIZE, "%s%s",
dev_name(v4l2_dev->dev), ".mipi-csi");
ret = v4l2_device_register_subdev(v4l2_dev, &priv->subdev);
dev_dbg(dev, "%s(%p): ret(register_subdev) = %d\n", __func__, priv, ret);
if (ret < 0)
return NOTIFY_DONE;

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

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

pm_runtime_get_sync(v4l2_get_subdevdata(&priv->subdev));

sh_csi2_hwinit(priv);
break;
case BUS_NOTIFY_UNBIND_DRIVER:
priv->client = NULL;

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

v4l2_device_unregister_subdev(&priv->subdev);

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

return NOTIFY_OK;
}

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;
priv->notifier.notifier_call = sh_csi2_notify;

/* We MUST attach after the MIPI sensor */
ret = bus_register_notifier(&soc_camera_bus_type, &priv->notifier);
if (ret < 0) {
dev_err(&pdev->dev, "CSI2 cannot register notifier\n");
goto ernotify;
}

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;

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

platform_set_drvdata(pdev, priv);

pm_runtime_enable(&pdev->dev);

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

return 0;

eremap:
release_mem_region(res->start, resource_size(res));
ereqreg:
bus_unregister_notifier(&soc_camera_bus_type, &priv->notifier);
ernotify:
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);

bus_unregister_notifier(&soc_camera_bus_type, &priv->notifier);
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),
.driver = {
.name = "sh-mobile-csi2",
.owner = THIS_MODULE,
},
};

static int __init sh_csi2_init(void)
{
return platform_driver_probe(&sh_csi2_pdrv, sh_csi2_probe);
}

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");
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