/* -*- mode: c; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
/* vi: set ts=8 sw=8 sts=8: */
/*************************************************************************/ /*!
@File
@Codingstyle    LinuxKernel
@Copyright      Copyright (c) Imagination Technologies Ltd. All Rights Reserved
@License        Dual MIT/GPLv2

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*/ /**************************************************************************/

#include "drm_pdp_drv.h"

#include <linux/moduleparam.h>
#include <linux/version.h>

#include <drm/drmP.h>
#include <drm/drm_crtc.h>
#include <drm/drm_crtc_helper.h>
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 18, 0))
#include <drm/drm_gem.h>
#endif

#if (LINUX_VERSION_CODE < KERNEL_VERSION(4, 14, 0))
#define drm_gem_fb_create(...) pdp_framebuffer_create(__VA_ARGS__)
#else
#include <drm/drm_gem_framebuffer_helper.h>
#endif

#if defined(PDP_USE_ATOMIC)
#include <drm/drm_atomic_helper.h>
#endif

#include "kernel_compatibility.h"

#define PDP_WIDTH_MIN			640
#define PDP_WIDTH_MAX			1280
#define PDP_HEIGHT_MIN			480
#define PDP_HEIGHT_MAX			1024

#define ODIN_PDP_WIDTH_MAX		1920
#define ODIN_PDP_HEIGHT_MAX		1080

#define PLATO_PDP_WIDTH_MAX		1920
#define PLATO_PDP_HEIGHT_MAX	1080

static bool async_flip_enable = true;

module_param(async_flip_enable, bool, 0444);

MODULE_PARM_DESC(async_flip_enable,
		 "Enable support for 'faked' async flipping (default: Y)");

#if (LINUX_VERSION_CODE < KERNEL_VERSION(4, 14, 0))
static void pdp_framebuffer_destroy(struct drm_framebuffer *fb)
{
	struct pdp_framebuffer *pdp_fb = to_pdp_framebuffer(fb);

	DRM_DEBUG_DRIVER("[FB:%d]\n", fb->base.id);

	drm_framebuffer_cleanup(fb);

	drm_gem_object_put_unlocked(pdp_fb->obj[0]);

	kfree(pdp_fb);
}

static int pdp_framebuffer_create_handle(struct drm_framebuffer *fb,
					 struct drm_file *file,
					 unsigned int *handle)
{
	struct pdp_framebuffer *pdp_fb = to_pdp_framebuffer(fb);

	DRM_DEBUG_DRIVER("[FB:%d]\n", fb->base.id);

	return drm_gem_handle_create(file, pdp_fb->obj[0], handle);
}

static const struct drm_framebuffer_funcs pdp_framebuffer_funcs = {
	.destroy = pdp_framebuffer_destroy,
	.create_handle = pdp_framebuffer_create_handle,
	.dirty = NULL,
};

static struct drm_framebuffer *
pdp_framebuffer_create(struct drm_device *dev,
		       struct drm_file *file,
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4, 5, 0)) || \
	(defined(CHROMIUMOS_KERNEL) && (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 18, 0)))
		       const
#endif
		       struct drm_mode_fb_cmd2 *mode_cmd)
{
	struct pdp_drm_private *dev_priv = dev->dev_private;
	struct drm_gem_object *obj;
	struct pdp_framebuffer *pdp_fb;
	int err;

	obj = drm_gem_object_lookup(file, mode_cmd->handles[0]);
	if (!obj) {
		DRM_ERROR("failed to find buffer with handle %u\n",
			  mode_cmd->handles[0]);
		err = -ENOENT;
		goto err_out;
	}

	pdp_fb = kzalloc(sizeof(*pdp_fb), GFP_KERNEL);
	if (!pdp_fb) {
		err = -ENOMEM;
		goto err_obj_put;
	}

	drm_helper_mode_fill_fb_struct(dev_priv->dev, &pdp_fb->base, mode_cmd);
	pdp_fb->obj[0] = obj;

	err = drm_framebuffer_init(dev_priv->dev, &pdp_fb->base,
				   &pdp_framebuffer_funcs);
	if (err) {
		DRM_ERROR("failed to initialise framebuffer (err=%d)\n", err);
		goto err_free_fb;
	}

	DRM_DEBUG_DRIVER("[FB:%d]\n", pdp_fb->base.base.id);

	return &pdp_fb->base;

err_free_fb:
	kfree(pdp_fb);
err_obj_put:
	drm_gem_object_put_unlocked(obj);
err_out:
	return ERR_PTR(err);
}
#endif /* (LINUX_VERSION_CODE < KERNEL_VERSION(4, 14, 0)) */


/*************************************************************************
 * DRM mode config callbacks
 **************************************************************************/

static struct drm_framebuffer *
pdp_fb_create(struct drm_device *dev,
			struct drm_file *file,
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4, 5, 0)) || \
    (defined(CHROMIUMOS_KERNEL) && (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 18, 0)))
			const
#endif
			struct drm_mode_fb_cmd2 *mode_cmd)
{
	struct drm_framebuffer *fb;

	switch (mode_cmd->pixel_format) {
	case DRM_FORMAT_ARGB8888:
	case DRM_FORMAT_XRGB8888:
		break;
	default:
		DRM_ERROR("pixel format not supported (format = %u)\n",
			  mode_cmd->pixel_format);
		return ERR_PTR(-EINVAL);
	}

	if (mode_cmd->flags & DRM_MODE_FB_INTERLACED) {
		DRM_ERROR("interlaced framebuffers not supported\n");
		return ERR_PTR(-EINVAL);
	}

#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4, 1, 0))
	if (mode_cmd->modifier[0] != DRM_FORMAT_MOD_NONE) {
		DRM_ERROR("format modifier 0x%llx is not supported\n",
			  mode_cmd->modifier[0]);
		return ERR_PTR(-EINVAL);
	}
#endif

	fb = drm_gem_fb_create(dev, file, mode_cmd);
	if (IS_ERR(fb))
		goto out;

	DRM_DEBUG_DRIVER("[FB:%d]\n", fb->base.id);

out:
	return fb;
}

static const struct drm_mode_config_funcs pdp_mode_config_funcs = {
	.fb_create = pdp_fb_create,
	.output_poll_changed = NULL,
#if defined(PDP_USE_ATOMIC)
	.atomic_check = drm_atomic_helper_check,
	.atomic_commit = drm_atomic_helper_commit,
#endif
};


int pdp_modeset_early_init(struct pdp_drm_private *dev_priv)
{
	struct drm_device *dev = dev_priv->dev;
	int err;

	drm_mode_config_init(dev);

	dev->mode_config.funcs = &pdp_mode_config_funcs;
	dev->mode_config.min_width = PDP_WIDTH_MIN;
	dev->mode_config.min_height = PDP_HEIGHT_MIN;

	switch (dev_priv->version) {
	case PDP_VERSION_APOLLO:
		dev->mode_config.max_width = PDP_WIDTH_MAX;
		dev->mode_config.max_height = PDP_HEIGHT_MAX;
		break;
	case PDP_VERSION_ODIN:
		dev->mode_config.max_width = ODIN_PDP_WIDTH_MAX;
		dev->mode_config.max_height = ODIN_PDP_HEIGHT_MAX;
		break;
	case PDP_VERSION_PLATO:
		dev->mode_config.max_width = PLATO_PDP_WIDTH_MAX;
		dev->mode_config.max_height = PLATO_PDP_HEIGHT_MAX;
		break;
	default:
		BUG();
	}

	DRM_INFO("max_width is %d\n",
		dev->mode_config.max_width);
	DRM_INFO("max_height is %d\n",
		dev->mode_config.max_height);

	dev->mode_config.fb_base = 0;
	dev->mode_config.async_page_flip = async_flip_enable;

	DRM_INFO("%s async flip support is %s\n",
		 dev->driver->name, async_flip_enable ? "enabled" : "disabled");

#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4, 1, 0))
	dev->mode_config.allow_fb_modifiers = true;
#endif

	dev_priv->plane = pdp_plane_create(dev, DRM_PLANE_TYPE_PRIMARY);
	if (IS_ERR(dev_priv->plane)) {
		DRM_ERROR("failed to create a primary plane\n");
		err = PTR_ERR(dev_priv->plane);
		goto err_config_cleanup;
	}

	dev_priv->crtc = pdp_crtc_create(dev, 0, dev_priv->plane);
	if (IS_ERR(dev_priv->crtc)) {
		DRM_ERROR("failed to create a CRTC\n");
		err = PTR_ERR(dev_priv->crtc);
		goto err_config_cleanup;
	}

	switch (dev_priv->version) {
	case PDP_VERSION_APOLLO:
	case PDP_VERSION_ODIN:
		dev_priv->connector = pdp_dvi_connector_create(dev);
		if (IS_ERR(dev_priv->connector)) {
			DRM_ERROR("failed to create a connector\n");
			err = PTR_ERR(dev_priv->connector);
			goto err_config_cleanup;
		}

		dev_priv->encoder = pdp_tmds_encoder_create(dev);
		if (IS_ERR(dev_priv->encoder)) {
			DRM_ERROR("failed to create an encoder\n");
			err = PTR_ERR(dev_priv->encoder);
			goto err_config_cleanup;
		}

		err = drm_mode_connector_attach_encoder(dev_priv->connector,
							dev_priv->encoder);
		if (err) {
			DRM_ERROR("failed to attach [ENCODER:%d:%s] to [CONNECTOR:%d:%s] (err=%d)\n",
				  dev_priv->encoder->base.id,
				  dev_priv->encoder->name,
				  dev_priv->connector->base.id,
				  dev_priv->connector->name,
				  err);
			goto err_config_cleanup;
		}
		break;
	case PDP_VERSION_PLATO:
		// PLATO connectors are created in HDMI component driver
		break;
	default:
		BUG();
	}

	DRM_DEBUG_DRIVER("initialised\n");

	return 0;

err_config_cleanup:
	drm_mode_config_cleanup(dev);

	return err;
}

int pdp_modeset_late_init(struct pdp_drm_private *dev_priv)
{
	struct drm_device *ddev = dev_priv->dev;

	drm_mode_config_reset(ddev);

#if (LINUX_VERSION_CODE < KERNEL_VERSION(4, 8, 0))
	if (dev_priv->connector != NULL) {
		int err;

		err = drm_connector_register(dev_priv->connector);
		if (err) {
			DRM_ERROR("[CONNECTOR:%d:%s] failed to register (err=%d)\n",
				  dev_priv->connector->base.id,
				  dev_priv->connector->name,
				  err);
			return err;
		}
	}
#endif
	return 0;
}

void pdp_modeset_early_cleanup(struct pdp_drm_private *dev_priv)
{
#if (LINUX_VERSION_CODE < KERNEL_VERSION(4, 8, 0))
	if (dev_priv->connector != NULL)
		drm_connector_unregister(dev_priv->connector);
#endif
}

void pdp_modeset_late_cleanup(struct pdp_drm_private *dev_priv)
{
	drm_mode_config_cleanup(dev_priv->dev);

	DRM_DEBUG_DRIVER("cleaned up\n");
}
