/*
 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
 * Authors:
 *	Inki Dae <inki.dae@samsung.com>
 *	Joonyoung Shim <jy0922.shim@samsung.com>
 *	Seung-Woo Kim <sw0312.kim@samsung.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 <drm/drmP.h>
#include <drm/drm_crtc_helper.h>

#include <linux/anon_inodes.h>

#include <drm/exynos_drm.h>

#include "exynos_drm_drv.h"
#include "exynos_drm_crtc.h"
#include "exynos_drm_encoder.h"
#include "exynos_drm_fbdev.h"
#include "exynos_drm_fb.h"
#include "exynos_drm_gem.h"
#include "exynos_drm_plane.h"
#include "exynos_drm_vidi.h"
#include "exynos_drm_dmabuf.h"
#include "exynos_drm_g2d.h"
#include "exynos_drm_ipp.h"
#include "exynos_drm_iommu.h"

#define DRIVER_NAME	"exynos"
#define DRIVER_DESC	"Samsung SoC DRM"
#define DRIVER_DATE	"20110530"
#define DRIVER_MAJOR	1
#define DRIVER_MINOR	0

#define VBLANK_OFF_DELAY	50000

/* platform device pointer for eynos drm device. */
static struct platform_device *exynos_drm_pdev;

static int exynos_drm_load(struct drm_device *dev, unsigned long flags)
{
	struct exynos_drm_private *private;
	int ret;
	int nr;

	private = kzalloc(sizeof(struct exynos_drm_private), GFP_KERNEL);
	if (!private)
		return -ENOMEM;

	INIT_LIST_HEAD(&private->pageflip_event_list);
	dev->dev_private = (void *)private;

	/*
	 * create mapping to manage iommu table and set a pointer to iommu
	 * mapping structure to iommu_mapping of private data.
	 * also this iommu_mapping can be used to check if iommu is supported
	 * or not.
	 */
	ret = drm_create_iommu_mapping(dev);
	if (ret < 0) {
		DRM_ERROR("failed to create iommu mapping.\n");
		goto err_crtc;
	}

	drm_mode_config_init(dev);

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

	exynos_drm_mode_config_init(dev);

	/*
	 * EXYNOS4 is enough to have two CRTCs and each crtc would be used
	 * without dependency of hardware.
	 */
	for (nr = 0; nr < MAX_CRTC; nr++) {
		ret = exynos_drm_crtc_create(dev, nr);
		if (ret)
			goto err_release_iommu_mapping;
	}

	for (nr = 0; nr < MAX_PLANE; nr++) {
		struct drm_plane *plane;
		unsigned int possible_crtcs = (1 << MAX_CRTC) - 1;

		plane = exynos_plane_init(dev, possible_crtcs, false);
		if (!plane)
			goto err_release_iommu_mapping;
	}

	ret = drm_vblank_init(dev, MAX_CRTC);
	if (ret)
		goto err_release_iommu_mapping;

	/*
	 * probe sub drivers such as display controller and hdmi driver,
	 * that were registered at probe() of platform driver
	 * to the sub driver and create encoder and connector for them.
	 */
	ret = exynos_drm_device_register(dev);
	if (ret)
		goto err_vblank;

	/* setup possible_clones. */
	exynos_drm_encoder_setup(dev);

	/*
	 * create and configure fb helper and also exynos specific
	 * fbdev object.
	 */
	ret = exynos_drm_fbdev_init(dev);
	if (ret) {
		DRM_ERROR("failed to initialize drm fbdev\n");
		goto err_drm_device;
	}

	drm_vblank_offdelay = VBLANK_OFF_DELAY;

	platform_set_drvdata(dev->platformdev, dev);

	return 0;

err_drm_device:
	exynos_drm_device_unregister(dev);
err_vblank:
	drm_vblank_cleanup(dev);
err_release_iommu_mapping:
	drm_release_iommu_mapping(dev);
err_crtc:
	drm_mode_config_cleanup(dev);
	kfree(private);

	return ret;
}

static int exynos_drm_unload(struct drm_device *dev)
{
	exynos_drm_fbdev_fini(dev);
	exynos_drm_device_unregister(dev);
	drm_vblank_cleanup(dev);
	drm_kms_helper_poll_fini(dev);
	drm_mode_config_cleanup(dev);

	drm_release_iommu_mapping(dev);
	kfree(dev->dev_private);

	dev->dev_private = NULL;

	return 0;
}

static const struct file_operations exynos_drm_gem_fops = {
	.mmap = exynos_drm_gem_mmap_buffer,
};

static int exynos_drm_open(struct drm_device *dev, struct drm_file *file)
{
	struct drm_exynos_file_private *file_priv;
	struct file *anon_filp;
	int ret;

	file_priv = kzalloc(sizeof(*file_priv), GFP_KERNEL);
	if (!file_priv)
		return -ENOMEM;

	file->driver_priv = file_priv;

	ret = exynos_drm_subdrv_open(dev, file);
	if (ret)
		goto out;

	anon_filp = anon_inode_getfile("exynos_gem", &exynos_drm_gem_fops,
					NULL, 0);
	if (IS_ERR(anon_filp)) {
		ret = PTR_ERR(anon_filp);
		goto out;
	}

	anon_filp->f_mode = FMODE_READ | FMODE_WRITE;
	file_priv->anon_filp = anon_filp;

	return ret;
out:
	kfree(file_priv);
	file->driver_priv = NULL;
	return ret;
}

static void exynos_drm_preclose(struct drm_device *dev,
					struct drm_file *file)
{
	exynos_drm_subdrv_close(dev, file);
}

static void exynos_drm_postclose(struct drm_device *dev, struct drm_file *file)
{
	struct exynos_drm_private *private = dev->dev_private;
	struct drm_exynos_file_private *file_priv;
	struct drm_pending_vblank_event *v, *vt;
	struct drm_pending_event *e, *et;
	unsigned long flags;

	if (!file->driver_priv)
		return;

	/* Release all events not unhandled by page flip handler. */
	spin_lock_irqsave(&dev->event_lock, flags);
	list_for_each_entry_safe(v, vt, &private->pageflip_event_list,
			base.link) {
		if (v->base.file_priv == file) {
			list_del(&v->base.link);
			drm_vblank_put(dev, v->pipe);
			v->base.destroy(&v->base);
		}
	}

	/* Release all events handled by page flip handler but not freed. */
	list_for_each_entry_safe(e, et, &file->event_list, link) {
		list_del(&e->link);
		e->destroy(e);
	}
	spin_unlock_irqrestore(&dev->event_lock, flags);

	file_priv = file->driver_priv;
	if (file_priv->anon_filp)
		fput(file_priv->anon_filp);

	kfree(file->driver_priv);
	file->driver_priv = NULL;
}

static void exynos_drm_lastclose(struct drm_device *dev)
{
	exynos_drm_fbdev_restore_mode(dev);
}

static const struct vm_operations_struct exynos_drm_gem_vm_ops = {
	.fault = exynos_drm_gem_fault,
	.open = drm_gem_vm_open,
	.close = drm_gem_vm_close,
};

static const struct drm_ioctl_desc exynos_ioctls[] = {
	DRM_IOCTL_DEF_DRV(EXYNOS_GEM_CREATE, exynos_drm_gem_create_ioctl,
			DRM_UNLOCKED | DRM_AUTH),
	DRM_IOCTL_DEF_DRV(EXYNOS_GEM_MAP_OFFSET,
			exynos_drm_gem_map_offset_ioctl, DRM_UNLOCKED |
			DRM_AUTH),
	DRM_IOCTL_DEF_DRV(EXYNOS_GEM_MMAP,
			exynos_drm_gem_mmap_ioctl, DRM_UNLOCKED | DRM_AUTH),
	DRM_IOCTL_DEF_DRV(EXYNOS_GEM_GET,
			exynos_drm_gem_get_ioctl, DRM_UNLOCKED),
	DRM_IOCTL_DEF_DRV(EXYNOS_VIDI_CONNECTION,
			vidi_connection_ioctl, DRM_UNLOCKED | DRM_AUTH),
	DRM_IOCTL_DEF_DRV(EXYNOS_G2D_GET_VER,
			exynos_g2d_get_ver_ioctl, DRM_UNLOCKED | DRM_AUTH),
	DRM_IOCTL_DEF_DRV(EXYNOS_G2D_SET_CMDLIST,
			exynos_g2d_set_cmdlist_ioctl, DRM_UNLOCKED | DRM_AUTH),
	DRM_IOCTL_DEF_DRV(EXYNOS_G2D_EXEC,
			exynos_g2d_exec_ioctl, DRM_UNLOCKED | DRM_AUTH),
	DRM_IOCTL_DEF_DRV(EXYNOS_IPP_GET_PROPERTY,
			exynos_drm_ipp_get_property, DRM_UNLOCKED | DRM_AUTH),
	DRM_IOCTL_DEF_DRV(EXYNOS_IPP_SET_PROPERTY,
			exynos_drm_ipp_set_property, DRM_UNLOCKED | DRM_AUTH),
	DRM_IOCTL_DEF_DRV(EXYNOS_IPP_QUEUE_BUF,
			exynos_drm_ipp_queue_buf, DRM_UNLOCKED | DRM_AUTH),
	DRM_IOCTL_DEF_DRV(EXYNOS_IPP_CMD_CTRL,
			exynos_drm_ipp_cmd_ctrl, DRM_UNLOCKED | DRM_AUTH),
};

static const struct file_operations exynos_drm_driver_fops = {
	.owner		= THIS_MODULE,
	.open		= drm_open,
	.mmap		= exynos_drm_gem_mmap,
	.poll		= drm_poll,
	.read		= drm_read,
	.unlocked_ioctl	= drm_ioctl,
#ifdef CONFIG_COMPAT
	.compat_ioctl = drm_compat_ioctl,
#endif
	.release	= drm_release,
};

static struct drm_driver exynos_drm_driver = {
	.driver_features	= DRIVER_HAVE_IRQ | DRIVER_MODESET |
					DRIVER_GEM | DRIVER_PRIME,
	.load			= exynos_drm_load,
	.unload			= exynos_drm_unload,
	.open			= exynos_drm_open,
	.preclose		= exynos_drm_preclose,
	.lastclose		= exynos_drm_lastclose,
	.postclose		= exynos_drm_postclose,
	.get_vblank_counter	= drm_vblank_count,
	.enable_vblank		= exynos_drm_crtc_enable_vblank,
	.disable_vblank		= exynos_drm_crtc_disable_vblank,
	.gem_free_object	= exynos_drm_gem_free_object,
	.gem_vm_ops		= &exynos_drm_gem_vm_ops,
	.dumb_create		= exynos_drm_gem_dumb_create,
	.dumb_map_offset	= exynos_drm_gem_dumb_map_offset,
	.dumb_destroy		= drm_gem_dumb_destroy,
	.prime_handle_to_fd	= drm_gem_prime_handle_to_fd,
	.prime_fd_to_handle	= drm_gem_prime_fd_to_handle,
	.gem_prime_export	= exynos_dmabuf_prime_export,
	.gem_prime_import	= exynos_dmabuf_prime_import,
	.ioctls			= exynos_ioctls,
	.num_ioctls		= ARRAY_SIZE(exynos_ioctls),
	.fops			= &exynos_drm_driver_fops,
	.name	= DRIVER_NAME,
	.desc	= DRIVER_DESC,
	.date	= DRIVER_DATE,
	.major	= DRIVER_MAJOR,
	.minor	= DRIVER_MINOR,
};

static int exynos_drm_platform_probe(struct platform_device *pdev)
{
	int ret;

	ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
	if (ret)
		return ret;

	return drm_platform_init(&exynos_drm_driver, pdev);
}

static int exynos_drm_platform_remove(struct platform_device *pdev)
{
	drm_put_dev(platform_get_drvdata(pdev));

	return 0;
}

static struct platform_driver exynos_drm_platform_driver = {
	.probe		= exynos_drm_platform_probe,
	.remove		= exynos_drm_platform_remove,
	.driver		= {
		.owner	= THIS_MODULE,
		.name	= "exynos-drm",
	},
};

static int __init exynos_drm_init(void)
{
	int ret;

#ifdef CONFIG_DRM_EXYNOS_FIMD
	ret = platform_driver_register(&fimd_driver);
	if (ret < 0)
		goto out_fimd;
#endif

#ifdef CONFIG_DRM_EXYNOS_HDMI
	ret = platform_driver_register(&hdmi_driver);
	if (ret < 0)
		goto out_hdmi;
	ret = platform_driver_register(&mixer_driver);
	if (ret < 0)
		goto out_mixer;
	ret = platform_driver_register(&exynos_drm_common_hdmi_driver);
	if (ret < 0)
		goto out_common_hdmi;

	ret = exynos_platform_device_hdmi_register();
	if (ret < 0)
		goto out_common_hdmi_dev;
#endif

#ifdef CONFIG_DRM_EXYNOS_VIDI
	ret = platform_driver_register(&vidi_driver);
	if (ret < 0)
		goto out_vidi;
#endif

#ifdef CONFIG_DRM_EXYNOS_G2D
	ret = platform_driver_register(&g2d_driver);
	if (ret < 0)
		goto out_g2d;
#endif

#ifdef CONFIG_DRM_EXYNOS_FIMC
	ret = platform_driver_register(&fimc_driver);
	if (ret < 0)
		goto out_fimc;
#endif

#ifdef CONFIG_DRM_EXYNOS_ROTATOR
	ret = platform_driver_register(&rotator_driver);
	if (ret < 0)
		goto out_rotator;
#endif

#ifdef CONFIG_DRM_EXYNOS_GSC
	ret = platform_driver_register(&gsc_driver);
	if (ret < 0)
		goto out_gsc;
#endif

#ifdef CONFIG_DRM_EXYNOS_IPP
	ret = platform_driver_register(&ipp_driver);
	if (ret < 0)
		goto out_ipp;

	ret = exynos_platform_device_ipp_register();
	if (ret < 0)
		goto out_ipp_dev;
#endif

	ret = platform_driver_register(&exynos_drm_platform_driver);
	if (ret < 0)
		goto out_drm;

	exynos_drm_pdev = platform_device_register_simple("exynos-drm", -1,
				NULL, 0);
	if (IS_ERR(exynos_drm_pdev)) {
		ret = PTR_ERR(exynos_drm_pdev);
		goto out;
	}

	return 0;

out:
	platform_driver_unregister(&exynos_drm_platform_driver);

out_drm:
#ifdef CONFIG_DRM_EXYNOS_IPP
	exynos_platform_device_ipp_unregister();
out_ipp_dev:
	platform_driver_unregister(&ipp_driver);
out_ipp:
#endif

#ifdef CONFIG_DRM_EXYNOS_GSC
	platform_driver_unregister(&gsc_driver);
out_gsc:
#endif

#ifdef CONFIG_DRM_EXYNOS_ROTATOR
	platform_driver_unregister(&rotator_driver);
out_rotator:
#endif

#ifdef CONFIG_DRM_EXYNOS_FIMC
	platform_driver_unregister(&fimc_driver);
out_fimc:
#endif

#ifdef CONFIG_DRM_EXYNOS_G2D
	platform_driver_unregister(&g2d_driver);
out_g2d:
#endif

#ifdef CONFIG_DRM_EXYNOS_VIDI
	platform_driver_unregister(&vidi_driver);
out_vidi:
#endif

#ifdef CONFIG_DRM_EXYNOS_HDMI
	exynos_platform_device_hdmi_unregister();
out_common_hdmi_dev:
	platform_driver_unregister(&exynos_drm_common_hdmi_driver);
out_common_hdmi:
	platform_driver_unregister(&mixer_driver);
out_mixer:
	platform_driver_unregister(&hdmi_driver);
out_hdmi:
#endif

#ifdef CONFIG_DRM_EXYNOS_FIMD
	platform_driver_unregister(&fimd_driver);
out_fimd:
#endif
	return ret;
}

static void __exit exynos_drm_exit(void)
{
	platform_device_unregister(exynos_drm_pdev);

	platform_driver_unregister(&exynos_drm_platform_driver);

#ifdef CONFIG_DRM_EXYNOS_IPP
	exynos_platform_device_ipp_unregister();
	platform_driver_unregister(&ipp_driver);
#endif

#ifdef CONFIG_DRM_EXYNOS_GSC
	platform_driver_unregister(&gsc_driver);
#endif

#ifdef CONFIG_DRM_EXYNOS_ROTATOR
	platform_driver_unregister(&rotator_driver);
#endif

#ifdef CONFIG_DRM_EXYNOS_FIMC
	platform_driver_unregister(&fimc_driver);
#endif

#ifdef CONFIG_DRM_EXYNOS_G2D
	platform_driver_unregister(&g2d_driver);
#endif

#ifdef CONFIG_DRM_EXYNOS_HDMI
	exynos_platform_device_hdmi_unregister();
	platform_driver_unregister(&exynos_drm_common_hdmi_driver);
	platform_driver_unregister(&mixer_driver);
	platform_driver_unregister(&hdmi_driver);
#endif

#ifdef CONFIG_DRM_EXYNOS_VIDI
	platform_driver_unregister(&vidi_driver);
#endif

#ifdef CONFIG_DRM_EXYNOS_FIMD
	platform_driver_unregister(&fimd_driver);
#endif
}

module_init(exynos_drm_init);
module_exit(exynos_drm_exit);

MODULE_AUTHOR("Inki Dae <inki.dae@samsung.com>");
MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
MODULE_AUTHOR("Seung-Woo Kim <sw0312.kim@samsung.com>");
MODULE_DESCRIPTION("Samsung SoC DRM Driver");
MODULE_LICENSE("GPL");