// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2020 Unisoc Inc.
 */

#include <linux/component.h>
#include <linux/dma-mapping.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of_graph.h>
#include <linux/platform_device.h>

#include <drm/drm_atomic_helper.h>
#include <drm/drm_drv.h>
#include <drm/drm_gem_dma_helper.h>
#include <drm/drm_gem_framebuffer_helper.h>
#include <drm/drm_of.h>
#include <drm/drm_probe_helper.h>
#include <drm/drm_vblank.h>

#include "sprd_drm.h"

#define DRIVER_NAME	"sprd"
#define DRIVER_DESC	"Spreadtrum SoCs' DRM Driver"
#define DRIVER_DATE	"20200201"
#define DRIVER_MAJOR	1
#define DRIVER_MINOR	0

static const struct drm_mode_config_helper_funcs sprd_drm_mode_config_helper = {
	.atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,
};

static const struct drm_mode_config_funcs sprd_drm_mode_config_funcs = {
	.fb_create = drm_gem_fb_create,
	.atomic_check = drm_atomic_helper_check,
	.atomic_commit = drm_atomic_helper_commit,
};

static void sprd_drm_mode_config_init(struct drm_device *drm)
{
	drm->mode_config.min_width = 0;
	drm->mode_config.min_height = 0;
	drm->mode_config.max_width = 8192;
	drm->mode_config.max_height = 8192;

	drm->mode_config.funcs = &sprd_drm_mode_config_funcs;
	drm->mode_config.helper_private = &sprd_drm_mode_config_helper;
}

DEFINE_DRM_GEM_DMA_FOPS(sprd_drm_fops);

static struct drm_driver sprd_drm_drv = {
	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
	.fops			= &sprd_drm_fops,

	/* GEM Operations */
	DRM_GEM_DMA_DRIVER_OPS,

	.name			= DRIVER_NAME,
	.desc			= DRIVER_DESC,
	.date			= DRIVER_DATE,
	.major			= DRIVER_MAJOR,
	.minor			= DRIVER_MINOR,
};

static int sprd_drm_bind(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct drm_device *drm;
	struct sprd_drm *sprd;
	int ret;

	sprd = devm_drm_dev_alloc(dev, &sprd_drm_drv, struct sprd_drm, drm);
	if (IS_ERR(sprd))
		return PTR_ERR(sprd);

	drm = &sprd->drm;
	platform_set_drvdata(pdev, drm);

	ret = drmm_mode_config_init(drm);
	if (ret)
		return ret;

	sprd_drm_mode_config_init(drm);

	/* bind and init sub drivers */
	ret = component_bind_all(drm->dev, drm);
	if (ret) {
		drm_err(drm, "failed to bind all component.\n");
		return ret;
	}

	/* vblank init */
	ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
	if (ret) {
		drm_err(drm, "failed to initialize vblank.\n");
		goto err_unbind_all;
	}

	/* reset all the states of crtc/plane/encoder/connector */
	drm_mode_config_reset(drm);

	/* init kms poll for handling hpd */
	drm_kms_helper_poll_init(drm);

	ret = drm_dev_register(drm, 0);
	if (ret < 0)
		goto err_kms_helper_poll_fini;

	return 0;

err_kms_helper_poll_fini:
	drm_kms_helper_poll_fini(drm);
err_unbind_all:
	component_unbind_all(drm->dev, drm);
	return ret;
}

static void sprd_drm_unbind(struct device *dev)
{
	struct drm_device *drm = dev_get_drvdata(dev);

	drm_dev_unregister(drm);

	drm_kms_helper_poll_fini(drm);

	component_unbind_all(drm->dev, drm);
}

static const struct component_master_ops drm_component_ops = {
	.bind = sprd_drm_bind,
	.unbind = sprd_drm_unbind,
};

static int sprd_drm_probe(struct platform_device *pdev)
{
	return drm_of_component_probe(&pdev->dev, component_compare_of, &drm_component_ops);
}

static void sprd_drm_remove(struct platform_device *pdev)
{
	component_master_del(&pdev->dev, &drm_component_ops);
}

static void sprd_drm_shutdown(struct platform_device *pdev)
{
	struct drm_device *drm = platform_get_drvdata(pdev);

	if (!drm) {
		dev_warn(&pdev->dev, "drm device is not available, no shutdown\n");
		return;
	}

	drm_atomic_helper_shutdown(drm);
}

static const struct of_device_id drm_match_table[] = {
	{ .compatible = "sprd,display-subsystem", },
	{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, drm_match_table);

static struct platform_driver sprd_drm_driver = {
	.probe = sprd_drm_probe,
	.remove_new = sprd_drm_remove,
	.shutdown = sprd_drm_shutdown,
	.driver = {
		.name = "sprd-drm-drv",
		.of_match_table = drm_match_table,
	},
};

static struct platform_driver *sprd_drm_drivers[]  = {
	&sprd_drm_driver,
	&sprd_dpu_driver,
	&sprd_dsi_driver,
};

static int __init sprd_drm_init(void)
{
	if (drm_firmware_drivers_only())
		return -ENODEV;

	return platform_register_drivers(sprd_drm_drivers,
					ARRAY_SIZE(sprd_drm_drivers));
}

static void __exit sprd_drm_exit(void)
{
	platform_unregister_drivers(sprd_drm_drivers,
				    ARRAY_SIZE(sprd_drm_drivers));
}

module_init(sprd_drm_init);
module_exit(sprd_drm_exit);

MODULE_AUTHOR("Leon He <leon.he@unisoc.com>");
MODULE_AUTHOR("Kevin Tang <kevin.tang@unisoc.com>");
MODULE_DESCRIPTION("Unisoc DRM KMS Master Driver");
MODULE_LICENSE("GPL v2");