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Commit 26e0ca22 authored by Laurent Pinchart's avatar Laurent Pinchart Committed by Mauro Carvalho Chehab
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[media] v4l: Renesas R-Car VSP1 driver 



The VSP1 is a video processing engine that includes a blender, scalers,
filters and statistics computation. Configurable data path routing logic
allows ordering the internal blocks in a flexible way.
Due to the configurable nature of the pipeline the driver implements the
media controller API and doesn't use the V4L2 mem-to-mem framework, even
though the device usually operates in memory to memory mode.
Only the read pixel formatters, up/down scalers, write pixel formatters
and LCDC interface are supported at this stage.

Signed-off-by: default avatarLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Acked-by: default avatarSakari Ailus <sakari.ailus@iki.fi>
Signed-off-by: default avatarMauro Carvalho Chehab <m.chehab@samsung.com>
parent 84930548

drivers/media/platform/Kconfig

+10 −0
Original line number Diff line number Diff line
@@ -210,6 +210,16 @@ config VIDEO_SH_VEU 
	    Support for the Video Engine Unit (VEU) on SuperH and

	    SH-Mobile SoCs.



config VIDEO_RENESAS_VSP1

	tristate "Renesas VSP1 Video Processing Engine"

	depends on VIDEO_V4L2 && VIDEO_V4L2_SUBDEV_API

	select VIDEOBUF2_DMA_CONTIG

	---help---

	  This is a V4L2 driver for the Renesas VSP1 video processing engine.



	  To compile this driver as a module, choose M here: the module

	  will be called vsp1.



endif # V4L_MEM2MEM_DRIVERS



menuconfig V4L_TEST_DRIVERS

drivers/media/platform/Makefile

+2 −0
Original line number Diff line number Diff line
@@ -46,6 +46,8 @@ obj-$(CONFIG_VIDEO_SH_VOU) += sh_vou.o 


obj-$(CONFIG_SOC_CAMERA)		+= soc_camera/



obj-$(CONFIG_VIDEO_RENESAS_VSP1)	+= vsp1/



obj-y	+= davinci/



obj-$(CONFIG_ARCH_OMAP)	+= omap/

drivers/media/platform/vsp1/Makefile

0 → 100644
+5 −0
Original line number Diff line number Diff line 
vsp1-y					:= vsp1_drv.o vsp1_entity.o vsp1_video.o

vsp1-y					+= vsp1_rpf.o vsp1_rwpf.o vsp1_wpf.o

vsp1-y					+= vsp1_lif.o vsp1_uds.o



obj-$(CONFIG_VIDEO_RENESAS_VSP1)	+= vsp1.o

drivers/media/platform/vsp1/vsp1.h

0 → 100644
+73 −0
Original line number Diff line number Diff line 
/*

 * vsp1.h  --  R-Car VSP1 Driver

 *

 * Copyright (C) 2013 Renesas Corporation

 *

 * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)

 *

 * 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.

 */

#ifndef __VSP1_H__

#define __VSP1_H__



#include <linux/io.h>

#include <linux/list.h>

#include <linux/mutex.h>

#include <linux/platform_data/vsp1.h>



#include <media/media-device.h>

#include <media/v4l2-device.h>

#include <media/v4l2-subdev.h>



#include "vsp1_regs.h"



struct clk;

struct device;



struct vsp1_platform_data;

struct vsp1_lif;

struct vsp1_rwpf;

struct vsp1_uds;



#define VPS1_MAX_RPF		5

#define VPS1_MAX_UDS		3

#define VPS1_MAX_WPF		4



struct vsp1_device {

	struct device *dev;

	struct vsp1_platform_data *pdata;



	void __iomem *mmio;

	struct clk *clock;



	struct mutex lock;

	int ref_count;



	struct vsp1_lif *lif;

	struct vsp1_rwpf *rpf[VPS1_MAX_RPF];

	struct vsp1_uds *uds[VPS1_MAX_UDS];

	struct vsp1_rwpf *wpf[VPS1_MAX_WPF];



	struct list_head entities;



	struct v4l2_device v4l2_dev;

	struct media_device media_dev;

};



struct vsp1_device *vsp1_device_get(struct vsp1_device *vsp1);

void vsp1_device_put(struct vsp1_device *vsp1);



static inline u32 vsp1_read(struct vsp1_device *vsp1, u32 reg)

{

	return ioread32(vsp1->mmio + reg);

}



static inline void vsp1_write(struct vsp1_device *vsp1, u32 reg, u32 data)

{

	iowrite32(data, vsp1->mmio + reg);

}



#endif /* __VSP1_H__ */

drivers/media/platform/vsp1/vsp1_drv.c

0 → 100644
+492 −0
Original line number Diff line number Diff line 
/*

 * vsp1_drv.c  --  R-Car VSP1 Driver

 *

 * Copyright (C) 2013 Renesas Corporation

 *

 * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)

 *

 * 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/clk.h>

#include <linux/delay.h>

#include <linux/device.h>

#include <linux/interrupt.h>

#include <linux/module.h>

#include <linux/platform_device.h>

#include <linux/videodev2.h>



#include "vsp1.h"

#include "vsp1_lif.h"

#include "vsp1_rwpf.h"

#include "vsp1_uds.h"



/* -----------------------------------------------------------------------------

 * Interrupt Handling

 */



static irqreturn_t vsp1_irq_handler(int irq, void *data)

{

	u32 mask = VI6_WFP_IRQ_STA_DFE | VI6_WFP_IRQ_STA_FRE;

	struct vsp1_device *vsp1 = data;

	irqreturn_t ret = IRQ_NONE;

	unsigned int i;



	for (i = 0; i < VPS1_MAX_WPF; ++i) {

		struct vsp1_rwpf *wpf = vsp1->wpf[i];

		struct vsp1_pipeline *pipe;

		u32 status;



		if (wpf == NULL)

			continue;



		pipe = to_vsp1_pipeline(&wpf->entity.subdev.entity);

		status = vsp1_read(vsp1, VI6_WPF_IRQ_STA(i));

		vsp1_write(vsp1, VI6_WPF_IRQ_STA(i), ~status & mask);



		if (status & VI6_WFP_IRQ_STA_FRE) {

			vsp1_pipeline_frame_end(pipe);

			ret = IRQ_HANDLED;

		}

	}



	return ret;

}



/* -----------------------------------------------------------------------------

 * Entities

 */



/*

 * vsp1_create_links - Create links from all sources to the given sink

 *

 * This function creates media links from all valid sources to the given sink

 * pad. Links that would be invalid according to the VSP1 hardware capabilities

 * are skipped. Those include all links

 *

 * - from a UDS to a UDS (UDS entities can't be chained)

 * - from an entity to itself (no loops are allowed)

 */

static int vsp1_create_links(struct vsp1_device *vsp1, struct vsp1_entity *sink)

{

	struct media_entity *entity = &sink->subdev.entity;

	struct vsp1_entity *source;

	unsigned int pad;

	int ret;



	list_for_each_entry(source, &vsp1->entities, list_dev) {

		u32 flags;



		if (source->type == sink->type)

			continue;



		if (source->type == VSP1_ENTITY_LIF ||

		    source->type == VSP1_ENTITY_WPF)

			continue;



		flags = source->type == VSP1_ENTITY_RPF &&

			sink->type == VSP1_ENTITY_WPF &&

			source->index == sink->index

		      ? MEDIA_LNK_FL_ENABLED : 0;



		for (pad = 0; pad < entity->num_pads; ++pad) {

			if (!(entity->pads[pad].flags & MEDIA_PAD_FL_SINK))

				continue;



			ret = media_entity_create_link(&source->subdev.entity,

						       source->source_pad,

						       entity, pad, flags);

			if (ret < 0)

				return ret;

		}

	}



	return 0;

}



static void vsp1_destroy_entities(struct vsp1_device *vsp1)

{

	struct vsp1_entity *entity;

	struct vsp1_entity *next;



	list_for_each_entry_safe(entity, next, &vsp1->entities, list_dev) {

		list_del(&entity->list_dev);

		vsp1_entity_destroy(entity);

	}



	v4l2_device_unregister(&vsp1->v4l2_dev);

	media_device_unregister(&vsp1->media_dev);

}



static int vsp1_create_entities(struct vsp1_device *vsp1)

{

	struct media_device *mdev = &vsp1->media_dev;

	struct v4l2_device *vdev = &vsp1->v4l2_dev;

	struct vsp1_entity *entity;

	unsigned int i;

	int ret;



	mdev->dev = vsp1->dev;

	strlcpy(mdev->model, "VSP1", sizeof(mdev->model));

	ret = media_device_register(mdev);

	if (ret < 0) {

		dev_err(vsp1->dev, "media device registration failed (%d)\n",

			ret);

		return ret;

	}



	vdev->mdev = mdev;

	ret = v4l2_device_register(vsp1->dev, vdev);

	if (ret < 0) {

		dev_err(vsp1->dev, "V4L2 device registration failed (%d)\n",

			ret);

		goto done;

	}



	/* Instantiate all the entities. */

	if (vsp1->pdata->features & VSP1_HAS_LIF) {

		vsp1->lif = vsp1_lif_create(vsp1);

		if (IS_ERR(vsp1->lif)) {

			ret = PTR_ERR(vsp1->lif);

			goto done;

		}



		list_add_tail(&vsp1->lif->entity.list_dev, &vsp1->entities);

	}



	for (i = 0; i < vsp1->pdata->rpf_count; ++i) {

		struct vsp1_rwpf *rpf;



		rpf = vsp1_rpf_create(vsp1, i);

		if (IS_ERR(rpf)) {

			ret = PTR_ERR(rpf);

			goto done;

		}



		vsp1->rpf[i] = rpf;

		list_add_tail(&rpf->entity.list_dev, &vsp1->entities);

	}



	for (i = 0; i < vsp1->pdata->uds_count; ++i) {

		struct vsp1_uds *uds;



		uds = vsp1_uds_create(vsp1, i);

		if (IS_ERR(uds)) {

			ret = PTR_ERR(uds);

			goto done;

		}



		vsp1->uds[i] = uds;

		list_add_tail(&uds->entity.list_dev, &vsp1->entities);

	}



	for (i = 0; i < vsp1->pdata->wpf_count; ++i) {

		struct vsp1_rwpf *wpf;



		wpf = vsp1_wpf_create(vsp1, i);

		if (IS_ERR(wpf)) {

			ret = PTR_ERR(wpf);

			goto done;

		}



		vsp1->wpf[i] = wpf;

		list_add_tail(&wpf->entity.list_dev, &vsp1->entities);

	}



	/* Create links. */

	list_for_each_entry(entity, &vsp1->entities, list_dev) {

		if (entity->type == VSP1_ENTITY_LIF ||

		    entity->type == VSP1_ENTITY_RPF)

			continue;



		ret = vsp1_create_links(vsp1, entity);

		if (ret < 0)

			goto done;

	}



	if (vsp1->pdata->features & VSP1_HAS_LIF) {

		ret = media_entity_create_link(

			&vsp1->wpf[0]->entity.subdev.entity, RWPF_PAD_SOURCE,

			&vsp1->lif->entity.subdev.entity, LIF_PAD_SINK, 0);

		if (ret < 0)

			return ret;

	}



	/* Register all subdevs. */

	list_for_each_entry(entity, &vsp1->entities, list_dev) {

		ret = v4l2_device_register_subdev(&vsp1->v4l2_dev,

						  &entity->subdev);

		if (ret < 0)

			goto done;

	}



	ret = v4l2_device_register_subdev_nodes(&vsp1->v4l2_dev);



done:

	if (ret < 0)

		vsp1_destroy_entities(vsp1);



	return ret;

}



static int vsp1_device_init(struct vsp1_device *vsp1)

{

	unsigned int i;

	u32 status;



	/* Reset any channel that might be running. */

	status = vsp1_read(vsp1, VI6_STATUS);



	for (i = 0; i < VPS1_MAX_WPF; ++i) {

		unsigned int timeout;



		if (!(status & VI6_STATUS_SYS_ACT(i)))

			continue;



		vsp1_write(vsp1, VI6_SRESET, VI6_SRESET_SRTS(i));

		for (timeout = 10; timeout > 0; --timeout) {

			status = vsp1_read(vsp1, VI6_STATUS);

			if (!(status & VI6_STATUS_SYS_ACT(i)))

				break;



			usleep_range(1000, 2000);

		}



		if (!timeout) {

			dev_err(vsp1->dev, "failed to reset wpf.%u\n", i);

			return -ETIMEDOUT;

		}

	}



	vsp1_write(vsp1, VI6_CLK_DCSWT, (8 << VI6_CLK_DCSWT_CSTPW_SHIFT) |

		   (8 << VI6_CLK_DCSWT_CSTRW_SHIFT));



	for (i = 0; i < VPS1_MAX_RPF; ++i)

		vsp1_write(vsp1, VI6_DPR_RPF_ROUTE(i), VI6_DPR_NODE_UNUSED);



	for (i = 0; i < VPS1_MAX_UDS; ++i)

		vsp1_write(vsp1, VI6_DPR_UDS_ROUTE(i), VI6_DPR_NODE_UNUSED);



	vsp1_write(vsp1, VI6_DPR_SRU_ROUTE, VI6_DPR_NODE_UNUSED);

	vsp1_write(vsp1, VI6_DPR_LUT_ROUTE, VI6_DPR_NODE_UNUSED);

	vsp1_write(vsp1, VI6_DPR_CLU_ROUTE, VI6_DPR_NODE_UNUSED);

	vsp1_write(vsp1, VI6_DPR_HST_ROUTE, VI6_DPR_NODE_UNUSED);

	vsp1_write(vsp1, VI6_DPR_HSI_ROUTE, VI6_DPR_NODE_UNUSED);

	vsp1_write(vsp1, VI6_DPR_BRU_ROUTE, VI6_DPR_NODE_UNUSED);



	vsp1_write(vsp1, VI6_DPR_HGO_SMPPT, (7 << VI6_DPR_SMPPT_TGW_SHIFT) |

		   (VI6_DPR_NODE_UNUSED << VI6_DPR_SMPPT_PT_SHIFT));

	vsp1_write(vsp1, VI6_DPR_HGT_SMPPT, (7 << VI6_DPR_SMPPT_TGW_SHIFT) |

		   (VI6_DPR_NODE_UNUSED << VI6_DPR_SMPPT_PT_SHIFT));



	return 0;

}



/*

 * vsp1_device_get - Acquire the VSP1 device

 *

 * Increment the VSP1 reference count and initialize the device if the first

 * reference is taken.

 *

 * Return a pointer to the VSP1 device or NULL if an error occured.

 */

struct vsp1_device *vsp1_device_get(struct vsp1_device *vsp1)

{

	struct vsp1_device *__vsp1 = vsp1;

	int ret;



	mutex_lock(&vsp1->lock);

	if (vsp1->ref_count > 0)

		goto done;



	ret = clk_prepare_enable(vsp1->clock);

	if (ret < 0) {

		__vsp1 = NULL;

		goto done;

	}



	ret = vsp1_device_init(vsp1);

	if (ret < 0) {

		clk_disable_unprepare(vsp1->clock);

		__vsp1 = NULL;

		goto done;

	}



done:

	if (__vsp1)

		vsp1->ref_count++;



	mutex_unlock(&vsp1->lock);

	return __vsp1;

}



/*

 * vsp1_device_put - Release the VSP1 device

 *

 * Decrement the VSP1 reference count and cleanup the device if the last

 * reference is released.

 */

void vsp1_device_put(struct vsp1_device *vsp1)

{

	mutex_lock(&vsp1->lock);



	if (--vsp1->ref_count == 0)

		clk_disable_unprepare(vsp1->clock);



	mutex_unlock(&vsp1->lock);

}



/* -----------------------------------------------------------------------------

 * Power Management

 */



#ifdef CONFIG_PM_SLEEP

static int vsp1_pm_suspend(struct device *dev)

{

	struct vsp1_device *vsp1 = dev_get_drvdata(dev);



	WARN_ON(mutex_is_locked(&vsp1->lock));



	if (vsp1->ref_count == 0)

		return 0;



	clk_disable_unprepare(vsp1->clock);

	return 0;

}



static int vsp1_pm_resume(struct device *dev)

{

	struct vsp1_device *vsp1 = dev_get_drvdata(dev);



	WARN_ON(mutex_is_locked(&vsp1->lock));



	if (vsp1->ref_count)

		return 0;



	return clk_prepare_enable(vsp1->clock);

}

#endif



static const struct dev_pm_ops vsp1_pm_ops = {

	SET_SYSTEM_SLEEP_PM_OPS(vsp1_pm_suspend, vsp1_pm_resume)

};



/* -----------------------------------------------------------------------------

 * Platform Driver

 */



static struct vsp1_platform_data *

vsp1_get_platform_data(struct platform_device *pdev)

{

	struct vsp1_platform_data *pdata = pdev->dev.platform_data;



	if (pdata == NULL) {

		dev_err(&pdev->dev, "missing platform data\n");

		return NULL;

	}



	if (pdata->rpf_count <= 0 || pdata->rpf_count > VPS1_MAX_RPF) {

		dev_err(&pdev->dev, "invalid number of RPF (%u)\n",

			pdata->rpf_count);

		return NULL;

	}



	if (pdata->uds_count <= 0 || pdata->uds_count > VPS1_MAX_UDS) {

		dev_err(&pdev->dev, "invalid number of UDS (%u)\n",

			pdata->uds_count);

		return NULL;

	}



	if (pdata->wpf_count <= 0 || pdata->wpf_count > VPS1_MAX_WPF) {

		dev_err(&pdev->dev, "invalid number of WPF (%u)\n",

			pdata->wpf_count);

		return NULL;

	}



	return pdata;

}



static int vsp1_probe(struct platform_device *pdev)

{

	struct vsp1_device *vsp1;

	struct resource *irq;

	struct resource *io;

	int ret;



	vsp1 = devm_kzalloc(&pdev->dev, sizeof(*vsp1), GFP_KERNEL);

	if (vsp1 == NULL)

		return -ENOMEM;



	vsp1->dev = &pdev->dev;

	mutex_init(&vsp1->lock);

	INIT_LIST_HEAD(&vsp1->entities);



	vsp1->pdata = vsp1_get_platform_data(pdev);

	if (vsp1->pdata == NULL)

		return -ENODEV;



	/* I/O, IRQ and clock resources */

	io = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	vsp1->mmio = devm_ioremap_resource(&pdev->dev, io);

	if (IS_ERR((void *)vsp1->mmio))

		return PTR_ERR((void *)vsp1->mmio);



	vsp1->clock = devm_clk_get(&pdev->dev, NULL);

	if (IS_ERR(vsp1->clock)) {

		dev_err(&pdev->dev, "failed to get clock\n");

		return PTR_ERR(vsp1->clock);

	}



	irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);

	if (!irq) {

		dev_err(&pdev->dev, "missing IRQ\n");

		return -EINVAL;

	}



	ret = devm_request_irq(&pdev->dev, irq->start, vsp1_irq_handler,

			      IRQF_SHARED, dev_name(&pdev->dev), vsp1);

	if (ret < 0) {

		dev_err(&pdev->dev, "failed to request IRQ\n");

		return ret;

	}



	/* Instanciate entities */

	ret = vsp1_create_entities(vsp1);

	if (ret < 0) {

		dev_err(&pdev->dev, "failed to create entities\n");

		return ret;

	}



	platform_set_drvdata(pdev, vsp1);



	return 0;

}



static int vsp1_remove(struct platform_device *pdev)

{

	struct vsp1_device *vsp1 = platform_get_drvdata(pdev);



	vsp1_destroy_entities(vsp1);



	return 0;

}



static struct platform_driver vsp1_platform_driver = {

	.probe		= vsp1_probe,

	.remove		= vsp1_remove,

	.driver		= {

		.owner	= THIS_MODULE,

		.name	= "vsp1",

		.pm	= &vsp1_pm_ops,

	},

};



module_platform_driver(vsp1_platform_driver);



MODULE_ALIAS("vsp1");

MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");

MODULE_DESCRIPTION("Renesas VSP1 Driver");

MODULE_LICENSE("GPL");