/*
 * Copyright © 2007 David Airlie
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 *
 * Authors:
 *     David Airlie
 */
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/pm_runtime.h>

#include <drm/drmP.h>
#include <drm/drm_crtc.h>
#include <drm/drm_crtc_helper.h>
#include <drm/amdgpu_drm.h>
#include "amdgpu.h"
#include "cikd.h"
#include "amdgpu_gem.h"

#include <drm/drm_fb_helper.h>

#include <linux/vga_switcheroo.h>

#include "amdgpu_display.h"

/* object hierarchy -
   this contains a helper + a amdgpu fb
   the helper contains a pointer to amdgpu framebuffer baseclass.
*/

static int
amdgpufb_open(struct fb_info *info, int user)
{
	struct amdgpu_fbdev *rfbdev = info->par;
	struct amdgpu_device *adev = rfbdev->adev;
	int ret = pm_runtime_get_sync(adev->ddev->dev);
	if (ret < 0 && ret != -EACCES) {
		pm_runtime_mark_last_busy(adev->ddev->dev);
		pm_runtime_put_autosuspend(adev->ddev->dev);
		return ret;
	}
	return 0;
}

static int
amdgpufb_release(struct fb_info *info, int user)
{
	struct amdgpu_fbdev *rfbdev = info->par;
	struct amdgpu_device *adev = rfbdev->adev;

	pm_runtime_mark_last_busy(adev->ddev->dev);
	pm_runtime_put_autosuspend(adev->ddev->dev);
	return 0;
}

static struct fb_ops amdgpufb_ops = {
	.owner = THIS_MODULE,
#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 10, 0)
	.fb_check_var	= drm_fb_helper_check_var,
	.fb_set_par	= drm_fb_helper_set_par,
	.fb_setcmap	= drm_fb_helper_setcmap,
	.fb_blank	= drm_fb_helper_blank,
	.fb_pan_display	= drm_fb_helper_pan_display,
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 36)
	.fb_debug_enter = drm_fb_helper_debug_enter,
	.fb_debug_leave = drm_fb_helper_debug_leave,
#endif
#else
	DRM_FB_HELPER_DEFAULT_OPS,
#endif
	.fb_open = amdgpufb_open,
	.fb_release = amdgpufb_release,
	.fb_fillrect = kcl_drm_fb_helper_cfb_fillrect,
	.fb_copyarea = kcl_drm_fb_helper_cfb_copyarea,
	.fb_imageblit = kcl_drm_fb_helper_cfb_imageblit,
};


int amdgpu_align_pitch(struct amdgpu_device *adev, int width, int cpp, bool tiled)
{
	int aligned = width;
	int pitch_mask = 0;

	switch (cpp) {
	case 1:
		pitch_mask = 255;
		break;
	case 2:
		pitch_mask = 127;
		break;
	case 3:
	case 4:
		pitch_mask = 63;
		break;
	}

	aligned += pitch_mask;
	aligned &= ~pitch_mask;
	return aligned * cpp;
}

static void amdgpufb_destroy_pinned_object(struct drm_gem_object *gobj)
{
	struct amdgpu_bo *abo = gem_to_amdgpu_bo(gobj);
	int ret;

	ret = amdgpu_bo_reserve(abo, true);
	if (likely(ret == 0)) {
		amdgpu_bo_kunmap(abo);
		amdgpu_bo_unpin(abo);
		amdgpu_bo_unreserve(abo);
	}
	kcl_drm_gem_object_put_unlocked(gobj);
}

static int amdgpufb_create_pinned_object(struct amdgpu_fbdev *rfbdev,
					 struct drm_mode_fb_cmd2 *mode_cmd,
					 struct drm_gem_object **gobj_p)
{
	struct amdgpu_device *adev = rfbdev->adev;
	struct drm_gem_object *gobj = NULL;
	struct amdgpu_bo *abo = NULL;
	bool fb_tiled = false; /* useful for testing */
	u32 tiling_flags = 0, domain;
	int ret;
	int aligned_size, size;
	int height = mode_cmd->height;
	u32 cpp;
	u64 flags = AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED |
			       AMDGPU_GEM_CREATE_VRAM_CONTIGUOUS     |
			       AMDGPU_GEM_CREATE_VRAM_CLEARED 	     |
			       AMDGPU_GEM_CREATE_CPU_GTT_USWC;

	cpp = drm_format_plane_cpp(mode_cmd->pixel_format, 0);

	/* need to align pitch with crtc limits */
	mode_cmd->pitches[0] = amdgpu_align_pitch(adev, mode_cmd->width, cpp,
						  fb_tiled);
	domain = amdgpu_display_supported_domains(adev, flags);
	height = ALIGN(mode_cmd->height, 8);
	size = mode_cmd->pitches[0] * height;
	aligned_size = ALIGN(size, PAGE_SIZE);
	ret = amdgpu_gem_object_create(adev, aligned_size, 0, domain, flags,
				       ttm_bo_type_kernel, NULL, &gobj);
	if (ret) {
		pr_err("failed to allocate framebuffer (%d)\n", aligned_size);
		return -ENOMEM;
	}
	abo = gem_to_amdgpu_bo(gobj);

	if (fb_tiled)
		tiling_flags = AMDGPU_TILING_SET(ARRAY_MODE, GRPH_ARRAY_2D_TILED_THIN1);

	ret = amdgpu_bo_reserve(abo, false);
	if (unlikely(ret != 0))
		goto out_unref;

	if (tiling_flags) {
		ret = amdgpu_bo_set_tiling_flags(abo,
						 tiling_flags);
		if (ret)
			dev_err(adev->dev, "FB failed to set tiling flags\n");
	}

	ret = amdgpu_bo_pin(abo, domain);
	if (ret) {
		amdgpu_bo_unreserve(abo);
		goto out_unref;
	}

	ret = amdgpu_ttm_alloc_gart(&abo->tbo);
	if (ret) {
		amdgpu_bo_unreserve(abo);
		dev_err(adev->dev, "%p bind failed\n", abo);
		goto out_unref;
	}

	ret = amdgpu_bo_kmap(abo, NULL);
	amdgpu_bo_unreserve(abo);
	if (ret) {
		goto out_unref;
	}

	*gobj_p = gobj;
	return 0;
out_unref:
	amdgpufb_destroy_pinned_object(gobj);
	*gobj_p = NULL;
	return ret;
}

static int amdgpufb_create(struct drm_fb_helper *helper,
			   struct drm_fb_helper_surface_size *sizes)
{
	struct amdgpu_fbdev *rfbdev = (struct amdgpu_fbdev *)helper;
	struct amdgpu_device *adev = rfbdev->adev;
	struct fb_info *info;
	struct drm_framebuffer *fb = NULL;
	struct drm_mode_fb_cmd2 mode_cmd;
	struct drm_gem_object *gobj = NULL;
	struct amdgpu_bo *abo = NULL;
	int ret;
	unsigned long tmp;

	mode_cmd.width = sizes->surface_width;
	mode_cmd.height = sizes->surface_height;

	if (sizes->surface_bpp == 24)
		sizes->surface_bpp = 32;

	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
							  sizes->surface_depth);

	ret = amdgpufb_create_pinned_object(rfbdev, &mode_cmd, &gobj);
	if (ret) {
		DRM_ERROR("failed to create fbcon object %d\n", ret);
		return ret;
	}

	abo = gem_to_amdgpu_bo(gobj);

	/* okay we have an object now allocate the framebuffer */
	info = kcl_drm_fb_helper_alloc_fbi(helper);
	if (IS_ERR(info)) {
		ret = PTR_ERR(info);
		goto out;
	}

	info->par = rfbdev;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 10, 0)
	info->skip_vt_switch = true;
#endif

	ret = amdgpu_display_framebuffer_init(adev->ddev, &rfbdev->rfb,
					      &mode_cmd, gobj);
	if (ret) {
		DRM_ERROR("failed to initialize framebuffer %d\n", ret);
		goto out;
	}

	fb = &rfbdev->rfb.base;

	/* setup helper */
	rfbdev->helper.fb = fb;

	strcpy(info->fix.id, "amdgpudrmfb");

#if DRM_VERSION_CODE < DRM_VERSION(4, 11, 0)
	drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
#else
	drm_fb_helper_fill_fix(info, fb->pitches[0], fb->format->depth);
#endif

	info->fbops = &amdgpufb_ops;

	tmp = amdgpu_bo_gpu_offset(abo) - adev->gmc.vram_start;
	info->fix.smem_start = adev->gmc.aper_base + tmp;
	info->fix.smem_len = amdgpu_bo_size(abo);
	info->screen_base = amdgpu_bo_kptr(abo);
	info->screen_size = amdgpu_bo_size(abo);

	drm_fb_helper_fill_var(info, &rfbdev->helper, sizes->fb_width, sizes->fb_height);

	/* setup aperture base/size for vesafb takeover */
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 35)
	info->aperture_base = adev->ddev->mode_config.fb_base;
	info->aperture_size = adev->gmc.aper_size;
#else
	info->apertures->ranges[0].base = adev->ddev->mode_config.fb_base;
	info->apertures->ranges[0].size = adev->gmc.aper_size;
#endif

	/* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */

	if (info->screen_base == NULL) {
		ret = -ENOSPC;
		goto out;
	}

	DRM_INFO("fb mappable at 0x%lX\n",  info->fix.smem_start);
	DRM_INFO("vram apper at 0x%lX\n",  (unsigned long)adev->gmc.aper_base);
	DRM_INFO("size %lu\n", (unsigned long)amdgpu_bo_size(abo));
#if DRM_VERSION_CODE < DRM_VERSION(4, 11, 0)
	DRM_INFO("fb depth is %d\n", fb->depth);
#else
	DRM_INFO("fb depth is %d\n", fb->format->depth);
#endif
	DRM_INFO("   pitch is %d\n", fb->pitches[0]);

	vga_switcheroo_client_fb_set(adev->ddev->pdev, info);
	return 0;

out:
	if (abo) {

	}
	if (fb && ret) {
		kcl_drm_gem_object_put_unlocked(gobj);
		drm_framebuffer_unregister_private(fb);
		drm_framebuffer_cleanup(fb);
		kfree(fb);
	}
	return ret;
}

#if DRM_VERSION_CODE < DRM_VERSION(4, 16, 0)
void amdgpu_fb_output_poll_changed(struct amdgpu_device *adev)
{
	if (adev->mode_info.rfbdev)
		drm_fb_helper_hotplug_event(&adev->mode_info.rfbdev->helper);
}

void amdgpu_fbdev_restore_mode(struct amdgpu_device *adev)
{
	struct amdgpu_fbdev *afbdev;
	struct drm_fb_helper *fb_helper;
	int ret;

	if (!adev)
		return;

	afbdev = adev->mode_info.rfbdev;

	if (!afbdev)
		return;

	fb_helper = &afbdev->helper;

	ret = drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper);
	if (ret)
		DRM_DEBUG("failed to restore crtc mode\n");
}
#endif
static int amdgpu_fbdev_destroy(struct drm_device *dev, struct amdgpu_fbdev *rfbdev)
{
	struct amdgpu_framebuffer *rfb = &rfbdev->rfb;
	struct drm_gem_object * obj = NULL;
	kcl_drm_fb_helper_unregister_fbi(&rfbdev->helper);
	obj = kcl_drm_fb_get_gem_obj(&rfb->base, 0);

	if (obj) {
		amdgpufb_destroy_pinned_object(obj);
		kcl_drm_fb_set_gem_obj(&rfb->base, 0, NULL);
		drm_framebuffer_unregister_private(&rfb->base);
		drm_framebuffer_cleanup(&rfb->base);
	}
	drm_fb_helper_fini(&rfbdev->helper);

	return 0;
}

static const struct drm_fb_helper_funcs amdgpu_fb_helper_funcs = {
	.fb_probe = amdgpufb_create,
};

int amdgpu_fbdev_init(struct amdgpu_device *adev)
{
	struct amdgpu_fbdev *rfbdev;
	int bpp_sel = 32;
	int ret;

	/* don't init fbdev on hw without DCE */
	if (!adev->mode_info.mode_config_initialized)
		return 0;

	/* don't init fbdev if there are no connectors */
	if (list_empty(&adev->ddev->mode_config.connector_list))
		return 0;

	/* select 8 bpp console on low vram cards */
	if (adev->gmc.real_vram_size <= (32*1024*1024))
		bpp_sel = 8;

	rfbdev = kzalloc(sizeof(struct amdgpu_fbdev), GFP_KERNEL);
	if (!rfbdev)
		return -ENOMEM;

	rfbdev->adev = adev;
	adev->mode_info.rfbdev = rfbdev;

	drm_fb_helper_prepare(adev->ddev, &rfbdev->helper,
			&amdgpu_fb_helper_funcs);

	ret = drm_fb_helper_init(adev->ddev, &rfbdev->helper,
#if DRM_VERSION_CODE < DRM_VERSION(4, 11, 0)
				 adev->mode_info.num_crtc,
#endif
				 AMDGPUFB_CONN_LIMIT);
	if (ret) {
		kfree(rfbdev);
		return ret;
	}

	drm_fb_helper_single_add_all_connectors(&rfbdev->helper);

	/* disable all the possible outputs/crtcs before entering KMS mode */
	if (!amdgpu_device_has_dc_support(adev))
		drm_helper_disable_unused_functions(adev->ddev);

	drm_fb_helper_initial_config(&rfbdev->helper, bpp_sel);
	return 0;
}

void amdgpu_fbdev_fini(struct amdgpu_device *adev)
{
	if (!adev->mode_info.rfbdev)
		return;

	amdgpu_fbdev_destroy(adev->ddev, adev->mode_info.rfbdev);
	kfree(adev->mode_info.rfbdev);
	adev->mode_info.rfbdev = NULL;
}

void amdgpu_fbdev_set_suspend_unlocked(struct amdgpu_device *adev, int state)
{
	if (adev->mode_info.rfbdev)
		kcl_drm_fb_helper_set_suspend_unlocked(&adev->mode_info.rfbdev->helper,
			state);
}

int amdgpu_fbdev_total_size(struct amdgpu_device *adev)
{
	struct amdgpu_bo *robj;
	int size = 0;

	if (!adev->mode_info.rfbdev)
		return 0;

	robj = gem_to_amdgpu_bo(kcl_drm_fb_get_gem_obj(&adev->mode_info.rfbdev->rfb.base, 0));
	size += amdgpu_bo_size(robj);
	return size;
}

bool amdgpu_fbdev_robj_is_fb(struct amdgpu_device *adev, struct amdgpu_bo *robj)
{
	if (!adev->mode_info.rfbdev)
		return false;
	if (robj == gem_to_amdgpu_bo(kcl_drm_fb_get_gem_obj(&adev->mode_info.rfbdev->rfb.base, 0)))
		return true;
	return false;
}