drivers/media/platform/atmel/atmel-sama5d2-isc.c - linux/kernel/git/bpf/bpf - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  * Microchip Image Sensor Controller (ISC) driver
  *
  * Copyright (C) 2016-2019 Microchip Technology, Inc.
  *
  * Author: Songjun Wu
  * Author: Eugen Hristev <eugen.hristev@microchip.com>
  *
  *
  * Sensor-->PFE-->WB-->CFA-->CC-->GAM-->CSC-->CBC-->SUB-->RLP-->DMA
  *
  * ISC video pipeline integrates the following submodules:
  * PFE: Parallel Front End to sample the camera sensor input stream
  *  WB: Programmable white balance in the Bayer domain
  * CFA: Color filter array interpolation module
  *  CC: Programmable color correction
  * GAM: Gamma correction
  * CSC: Programmable color space conversion
  * CBC: Contrast and Brightness control
  * SUB: This module performs YCbCr444 to YCbCr420 chrominance subsampling
  * RLP: This module performs rounding, range limiting
  *      and packing of the incoming data
  */

 #include <linux/clk.h>
 #include <linux/clkdev.h>
 #include <linux/clk-provider.h>
 #include <linux/delay.h>
 #include <linux/interrupt.h>
 #include <linux/math64.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_graph.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
 #include <linux/regmap.h>
 #include <linux/videodev2.h>

 #include <media/v4l2-ctrls.h>
 #include <media/v4l2-device.h>
 #include <media/v4l2-event.h>
 #include <media/v4l2-image-sizes.h>
 #include <media/v4l2-ioctl.h>
 #include <media/v4l2-fwnode.h>
 #include <media/v4l2-subdev.h>
 #include <media/videobuf2-dma-contig.h>

 #include "atmel-isc-regs.h"
 #include "atmel-isc.h"

 #define ISC_MAX_SUPPORT_WIDTH   2592
 #define ISC_MAX_SUPPORT_HEIGHT  1944

 #define ISC_CLK_MAX_DIV		255

 static int isc_parse_dt(struct device *dev, struct isc_device *isc)
 {
 	struct device_node *np = dev->of_node;
 	struct device_node *epn = NULL, *rem;
 	struct isc_subdev_entity *subdev_entity;
 	unsigned int flags;
 	int ret;

 	INIT_LIST_HEAD(&isc->subdev_entities);

 	while (1) {
 		struct v4l2_fwnode_endpoint v4l2_epn = { .bus_type = 0 };

 		epn = of_graph_get_next_endpoint(np, epn);
 		if (!epn)
 			return 0;

 		rem = of_graph_get_remote_port_parent(epn);
 		if (!rem) {
 			dev_notice(dev, "Remote device at %pOF not found\n",
 				   epn);
 			continue;
 		}

 		ret = v4l2_fwnode_endpoint_parse(of_fwnode_handle(epn),
 						 &v4l2_epn);
 		if (ret) {
 			of_node_put(rem);
 			ret = -EINVAL;
 			dev_err(dev, "Could not parse the endpoint\n");
 			break;
 		}

 		subdev_entity = devm_kzalloc(dev, sizeof(*subdev_entity),
 					     GFP_KERNEL);
 		if (!subdev_entity) {
 			of_node_put(rem);
 			ret = -ENOMEM;
 			break;
 		}

 		/* asd will be freed by the subsystem once it's added to the
 		 * notifier list
 		 */
 		subdev_entity->asd = kzalloc(sizeof(*subdev_entity->asd),
 					     GFP_KERNEL);
 		if (!subdev_entity->asd) {
 			of_node_put(rem);
 			ret = -ENOMEM;
 			break;
 		}

 		flags = v4l2_epn.bus.parallel.flags;

 		if (flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)
 			subdev_entity->pfe_cfg0 = ISC_PFE_CFG0_HPOL_LOW;

 		if (flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)
 			subdev_entity->pfe_cfg0 |= ISC_PFE_CFG0_VPOL_LOW;

 		if (flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)
 			subdev_entity->pfe_cfg0 |= ISC_PFE_CFG0_PPOL_LOW;

 		if (v4l2_epn.bus_type == V4L2_MBUS_BT656)
 			subdev_entity->pfe_cfg0 |= ISC_PFE_CFG0_CCIR_CRC |
 					ISC_PFE_CFG0_CCIR656;

 		subdev_entity->asd->match_type = V4L2_ASYNC_MATCH_FWNODE;
 		subdev_entity->asd->match.fwnode = of_fwnode_handle(rem);
 		list_add_tail(&subdev_entity->list, &isc->subdev_entities);
 	}

 	of_node_put(epn);
 	return ret;
 }

 static int atmel_isc_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct isc_device *isc;
 	struct resource *res;
 	void __iomem *io_base;
 	struct isc_subdev_entity *subdev_entity;
 	int irq;
 	int ret;

 	isc = devm_kzalloc(dev, sizeof(*isc), GFP_KERNEL);
 	if (!isc)
 		return -ENOMEM;

 	platform_set_drvdata(pdev, isc);
 	isc->dev = dev;

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	io_base = devm_ioremap_resource(dev, res);
 	if (IS_ERR(io_base))
 		return PTR_ERR(io_base);

 	isc->regmap = devm_regmap_init_mmio(dev, io_base, &isc_regmap_config);
 	if (IS_ERR(isc->regmap)) {
 		ret = PTR_ERR(isc->regmap);
 		dev_err(dev, "failed to init register map: %d\n", ret);
 		return ret;
 	}

 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0)
 		return irq;

 	ret = devm_request_irq(dev, irq, isc_interrupt, 0,
 			       ATMEL_ISC_NAME, isc);
 	if (ret < 0) {
 		dev_err(dev, "can't register ISR for IRQ %u (ret=%i)\n",
 			irq, ret);
 		return ret;
 	}

 	ret = isc_pipeline_init(isc);
 	if (ret)
 		return ret;

 	isc->hclock = devm_clk_get(dev, "hclock");
 	if (IS_ERR(isc->hclock)) {
 		ret = PTR_ERR(isc->hclock);
 		dev_err(dev, "failed to get hclock: %d\n", ret);
 		return ret;
 	}

 	ret = clk_prepare_enable(isc->hclock);
 	if (ret) {
 		dev_err(dev, "failed to enable hclock: %d\n", ret);
 		return ret;
 	}

 	ret = isc_clk_init(isc);
 	if (ret) {
 		dev_err(dev, "failed to init isc clock: %d\n", ret);
 		goto unprepare_hclk;
 	}

 	isc->ispck = isc->isc_clks[ISC_ISPCK].clk;

 	ret = clk_prepare_enable(isc->ispck);
 	if (ret) {
 		dev_err(dev, "failed to enable ispck: %d\n", ret);
 		goto unprepare_hclk;
 	}

 	/* ispck should be greater or equal to hclock */
 	ret = clk_set_rate(isc->ispck, clk_get_rate(isc->hclock));
 	if (ret) {
 		dev_err(dev, "failed to set ispck rate: %d\n", ret);
 		goto unprepare_clk;
 	}

 	ret = v4l2_device_register(dev, &isc->v4l2_dev);
 	if (ret) {
 		dev_err(dev, "unable to register v4l2 device.\n");
 		goto unprepare_clk;
 	}

 	ret = isc_parse_dt(dev, isc);
 	if (ret) {
 		dev_err(dev, "fail to parse device tree\n");
 		goto unregister_v4l2_device;
 	}

 	if (list_empty(&isc->subdev_entities)) {
 		dev_err(dev, "no subdev found\n");
 		ret = -ENODEV;
 		goto unregister_v4l2_device;
 	}

 	list_for_each_entry(subdev_entity, &isc->subdev_entities, list) {
 		v4l2_async_notifier_init(&subdev_entity->notifier);

 		ret = v4l2_async_notifier_add_subdev(&subdev_entity->notifier,
 						     subdev_entity->asd);
 		if (ret) {
 			fwnode_handle_put(subdev_entity->asd->match.fwnode);
 			kfree(subdev_entity->asd);
 			goto cleanup_subdev;
 		}

 		subdev_entity->notifier.ops = &isc_async_ops;

 		ret = v4l2_async_notifier_register(&isc->v4l2_dev,
 						   &subdev_entity->notifier);
 		if (ret) {
 			dev_err(dev, "fail to register async notifier\n");
 			goto cleanup_subdev;
 		}

 		if (video_is_registered(&isc->video_dev))
 			break;
 	}

 	pm_runtime_set_active(dev);
 	pm_runtime_enable(dev);
 	pm_request_idle(dev);

 	return 0;

 cleanup_subdev:
 	isc_subdev_cleanup(isc);

 unregister_v4l2_device:
 	v4l2_device_unregister(&isc->v4l2_dev);

 unprepare_clk:
 	clk_disable_unprepare(isc->ispck);
 unprepare_hclk:
 	clk_disable_unprepare(isc->hclock);

 	isc_clk_cleanup(isc);

 	return ret;
 }

 static int atmel_isc_remove(struct platform_device *pdev)
 {
 	struct isc_device *isc = platform_get_drvdata(pdev);

 	pm_runtime_disable(&pdev->dev);

 	isc_subdev_cleanup(isc);

 	v4l2_device_unregister(&isc->v4l2_dev);

 	clk_disable_unprepare(isc->ispck);
 	clk_disable_unprepare(isc->hclock);

 	isc_clk_cleanup(isc);

 	return 0;
 }

 static int __maybe_unused isc_runtime_suspend(struct device *dev)
 {
 	struct isc_device *isc = dev_get_drvdata(dev);

 	clk_disable_unprepare(isc->ispck);
 	clk_disable_unprepare(isc->hclock);

 	return 0;
 }

 static int __maybe_unused isc_runtime_resume(struct device *dev)
 {
 	struct isc_device *isc = dev_get_drvdata(dev);
 	int ret;

 	ret = clk_prepare_enable(isc->hclock);
 	if (ret)
 		return ret;

 	ret = clk_prepare_enable(isc->ispck);
 	if (ret)
 		clk_disable_unprepare(isc->hclock);

 	return ret;
 }

 static const struct dev_pm_ops atmel_isc_dev_pm_ops = {
 	SET_RUNTIME_PM_OPS(isc_runtime_suspend, isc_runtime_resume, NULL)
 };

 static const struct of_device_id atmel_isc_of_match[] = {
 	{ .compatible = "atmel,sama5d2-isc" },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, atmel_isc_of_match);

 static struct platform_driver atmel_isc_driver = {
 	.probe	= atmel_isc_probe,
 	.remove	= atmel_isc_remove,
 	.driver	= {
 		.name		= ATMEL_ISC_NAME,
 		.pm		= &atmel_isc_dev_pm_ops,
 		.of_match_table = of_match_ptr(atmel_isc_of_match),
 	},
 };

 module_platform_driver(atmel_isc_driver);

 MODULE_AUTHOR("Songjun Wu");
 MODULE_DESCRIPTION("The V4L2 driver for Atmel-ISC");
 MODULE_LICENSE("GPL v2");
 MODULE_SUPPORTED_DEVICE("video");
	// SPDX-License-Identifier: GPL-2.0
	/*
	* Microchip Image Sensor Controller (ISC) driver
	*
	* Copyright (C) 2016-2019 Microchip Technology, Inc.
	*
	* Author: Songjun Wu
	* Author: Eugen Hristev <eugen.hristev@microchip.com>
	*
	*
	* Sensor-->PFE-->WB-->CFA-->CC-->GAM-->CSC-->CBC-->SUB-->RLP-->DMA
	*
	* ISC video pipeline integrates the following submodules:
	* PFE: Parallel Front End to sample the camera sensor input stream
	* WB: Programmable white balance in the Bayer domain
	* CFA: Color filter array interpolation module
	* CC: Programmable color correction
	* GAM: Gamma correction
	* CSC: Programmable color space conversion
	* CBC: Contrast and Brightness control
	* SUB: This module performs YCbCr444 to YCbCr420 chrominance subsampling
	* RLP: This module performs rounding, range limiting
	* and packing of the incoming data
	*/

	#include <linux/clk.h>
	#include <linux/clkdev.h>
	#include <linux/clk-provider.h>
	#include <linux/delay.h>
	#include <linux/interrupt.h>
	#include <linux/math64.h>
	#include <linux/module.h>
	#include <linux/of.h>
	#include <linux/of_graph.h>
	#include <linux/platform_device.h>
	#include <linux/pm_runtime.h>
	#include <linux/regmap.h>
	#include <linux/videodev2.h>

	#include <media/v4l2-ctrls.h>
	#include <media/v4l2-device.h>
	#include <media/v4l2-event.h>
	#include <media/v4l2-image-sizes.h>
	#include <media/v4l2-ioctl.h>
	#include <media/v4l2-fwnode.h>
	#include <media/v4l2-subdev.h>
	#include <media/videobuf2-dma-contig.h>

	#include "atmel-isc-regs.h"
	#include "atmel-isc.h"

	#define ISC_MAX_SUPPORT_WIDTH 2592
	#define ISC_MAX_SUPPORT_HEIGHT 1944

	#define ISC_CLK_MAX_DIV 255

	static int isc_parse_dt(struct device dev, struct isc_device isc)
	{
	struct device_node *np = dev->of_node;
	struct device_node epn = NULL, rem;
	struct isc_subdev_entity *subdev_entity;
	unsigned int flags;
	int ret;

	INIT_LIST_HEAD(&isc->subdev_entities);

	while (1) {
	struct v4l2_fwnode_endpoint v4l2_epn = { .bus_type = 0 };

	epn = of_graph_get_next_endpoint(np, epn);
	if (!epn)
	return 0;

	rem = of_graph_get_remote_port_parent(epn);
	if (!rem) {
	dev_notice(dev, "Remote device at %pOF not found\n",
	epn);
	continue;
	}

	ret = v4l2_fwnode_endpoint_parse(of_fwnode_handle(epn),
	&v4l2_epn);
	if (ret) {
	of_node_put(rem);
	ret = -EINVAL;
	dev_err(dev, "Could not parse the endpoint\n");
	break;
	}

	subdev_entity = devm_kzalloc(dev, sizeof(*subdev_entity),
	GFP_KERNEL);
	if (!subdev_entity) {
	of_node_put(rem);
	ret = -ENOMEM;
	break;
	}

	/* asd will be freed by the subsystem once it's added to the
	* notifier list
	*/
	subdev_entity->asd = kzalloc(sizeof(*subdev_entity->asd),
	GFP_KERNEL);
	if (!subdev_entity->asd) {
	of_node_put(rem);
	ret = -ENOMEM;
	break;
	}

	flags = v4l2_epn.bus.parallel.flags;

	if (flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)
	subdev_entity->pfe_cfg0 = ISC_PFE_CFG0_HPOL_LOW;

	if (flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)
	subdev_entity->pfe_cfg0 \|= ISC_PFE_CFG0_VPOL_LOW;

	if (flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)
	subdev_entity->pfe_cfg0 \|= ISC_PFE_CFG0_PPOL_LOW;

	if (v4l2_epn.bus_type == V4L2_MBUS_BT656)
	subdev_entity->pfe_cfg0 \|= ISC_PFE_CFG0_CCIR_CRC \|
	ISC_PFE_CFG0_CCIR656;

	subdev_entity->asd->match_type = V4L2_ASYNC_MATCH_FWNODE;
	subdev_entity->asd->match.fwnode = of_fwnode_handle(rem);
	list_add_tail(&subdev_entity->list, &isc->subdev_entities);
	}

	of_node_put(epn);
	return ret;
	}

	static int atmel_isc_probe(struct platform_device *pdev)
	{
	struct device *dev = &pdev->dev;
	struct isc_device *isc;
	struct resource *res;
	void __iomem *io_base;
	struct isc_subdev_entity *subdev_entity;
	int irq;
	int ret;

	isc = devm_kzalloc(dev, sizeof(*isc), GFP_KERNEL);
	if (!isc)
	return -ENOMEM;

	platform_set_drvdata(pdev, isc);
	isc->dev = dev;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	io_base = devm_ioremap_resource(dev, res);
	if (IS_ERR(io_base))
	return PTR_ERR(io_base);

	isc->regmap = devm_regmap_init_mmio(dev, io_base, &isc_regmap_config);
	if (IS_ERR(isc->regmap)) {
	ret = PTR_ERR(isc->regmap);
	dev_err(dev, "failed to init register map: %d\n", ret);
	return ret;
	}

	irq = platform_get_irq(pdev, 0);
	if (irq < 0)
	return irq;

	ret = devm_request_irq(dev, irq, isc_interrupt, 0,
	ATMEL_ISC_NAME, isc);
	if (ret < 0) {
	dev_err(dev, "can't register ISR for IRQ %u (ret=%i)\n",
	irq, ret);
	return ret;
	}

	ret = isc_pipeline_init(isc);
	if (ret)
	return ret;

	isc->hclock = devm_clk_get(dev, "hclock");
	if (IS_ERR(isc->hclock)) {
	ret = PTR_ERR(isc->hclock);
	dev_err(dev, "failed to get hclock: %d\n", ret);
	return ret;
	}

	ret = clk_prepare_enable(isc->hclock);
	if (ret) {
	dev_err(dev, "failed to enable hclock: %d\n", ret);
	return ret;
	}

	ret = isc_clk_init(isc);
	if (ret) {
	dev_err(dev, "failed to init isc clock: %d\n", ret);
	goto unprepare_hclk;
	}

	isc->ispck = isc->isc_clks[ISC_ISPCK].clk;

	ret = clk_prepare_enable(isc->ispck);
	if (ret) {
	dev_err(dev, "failed to enable ispck: %d\n", ret);
	goto unprepare_hclk;
	}

	/* ispck should be greater or equal to hclock */
	ret = clk_set_rate(isc->ispck, clk_get_rate(isc->hclock));
	if (ret) {
	dev_err(dev, "failed to set ispck rate: %d\n", ret);
	goto unprepare_clk;
	}

	ret = v4l2_device_register(dev, &isc->v4l2_dev);
	if (ret) {
	dev_err(dev, "unable to register v4l2 device.\n");
	goto unprepare_clk;
	}

	ret = isc_parse_dt(dev, isc);
	if (ret) {
	dev_err(dev, "fail to parse device tree\n");
	goto unregister_v4l2_device;
	}

	if (list_empty(&isc->subdev_entities)) {
	dev_err(dev, "no subdev found\n");
	ret = -ENODEV;
	goto unregister_v4l2_device;
	}

	list_for_each_entry(subdev_entity, &isc->subdev_entities, list) {
	v4l2_async_notifier_init(&subdev_entity->notifier);

	ret = v4l2_async_notifier_add_subdev(&subdev_entity->notifier,
	subdev_entity->asd);
	if (ret) {
	fwnode_handle_put(subdev_entity->asd->match.fwnode);
	kfree(subdev_entity->asd);
	goto cleanup_subdev;
	}

	subdev_entity->notifier.ops = &isc_async_ops;

	ret = v4l2_async_notifier_register(&isc->v4l2_dev,
	&subdev_entity->notifier);
	if (ret) {
	dev_err(dev, "fail to register async notifier\n");
	goto cleanup_subdev;
	}

	if (video_is_registered(&isc->video_dev))
	break;
	}

	pm_runtime_set_active(dev);
	pm_runtime_enable(dev);
	pm_request_idle(dev);

	return 0;

	cleanup_subdev:
	isc_subdev_cleanup(isc);

	unregister_v4l2_device:
	v4l2_device_unregister(&isc->v4l2_dev);

	unprepare_clk:
	clk_disable_unprepare(isc->ispck);
	unprepare_hclk:
	clk_disable_unprepare(isc->hclock);

	isc_clk_cleanup(isc);

	return ret;
	}

	static int atmel_isc_remove(struct platform_device *pdev)
	{
	struct isc_device *isc = platform_get_drvdata(pdev);

	pm_runtime_disable(&pdev->dev);

	isc_subdev_cleanup(isc);

	v4l2_device_unregister(&isc->v4l2_dev);

	clk_disable_unprepare(isc->ispck);
	clk_disable_unprepare(isc->hclock);

	isc_clk_cleanup(isc);

	return 0;
	}

	static int __maybe_unused isc_runtime_suspend(struct device *dev)
	{
	struct isc_device *isc = dev_get_drvdata(dev);

	clk_disable_unprepare(isc->ispck);
	clk_disable_unprepare(isc->hclock);

	return 0;
	}

	static int __maybe_unused isc_runtime_resume(struct device *dev)
	{
	struct isc_device *isc = dev_get_drvdata(dev);
	int ret;

	ret = clk_prepare_enable(isc->hclock);
	if (ret)
	return ret;

	ret = clk_prepare_enable(isc->ispck);
	if (ret)
	clk_disable_unprepare(isc->hclock);

	return ret;
	}

	static const struct dev_pm_ops atmel_isc_dev_pm_ops = {
	SET_RUNTIME_PM_OPS(isc_runtime_suspend, isc_runtime_resume, NULL)
	};

	static const struct of_device_id atmel_isc_of_match[] = {
	{ .compatible = "atmel,sama5d2-isc" },
	{ }
	};
	MODULE_DEVICE_TABLE(of, atmel_isc_of_match);

	static struct platform_driver atmel_isc_driver = {
	.probe = atmel_isc_probe,
	.remove = atmel_isc_remove,
	.driver = {
	.name = ATMEL_ISC_NAME,
	.pm = &atmel_isc_dev_pm_ops,
	.of_match_table = of_match_ptr(atmel_isc_of_match),
	},
	};

	module_platform_driver(atmel_isc_driver);

	MODULE_AUTHOR("Songjun Wu");
	MODULE_DESCRIPTION("The V4L2 driver for Atmel-ISC");
	MODULE_LICENSE("GPL v2");
	MODULE_SUPPORTED_DEVICE("video");