// SPDX-License-Identifier: GPL-2.0-only/* * Copyright (C) 2012-2013 Avionic Design GmbH * Copyright (C) 2012 NVIDIA CORPORATION.  All rights reserved. * * Based on the KMS/FB DMA helpers *   Copyright (C) 2012 Analog Devices Inc. */ #include <linux/console.h>#include <linux/fb.h>#include <linux/vmalloc.h> #include <drm/drm_drv.h>#include <drm/drm_crtc_helper.h>#include <drm/drm_fb_helper.h>#include <drm/drm_fourcc.h>#include <drm/drm_framebuffer.h>#include <drm/drm_gem_framebuffer_helper.h>#include <drm/drm_modeset_helper.h> #include "drm.h"#include "gem.h" static int tegra_fb_mmap(struct fb_info *info, struct vm_area_struct *vma){	struct drm_fb_helper *helper = info->par;	struct tegra_bo *bo;	int err; 	bo = tegra_fb_get_plane(helper->fb, 0); 	err = drm_gem_mmap_obj(&bo->gem, bo->gem.size, vma);	if (err < 0)		return err; 	return __tegra_gem_mmap(&bo->gem, vma);} static void tegra_fbdev_fb_destroy(struct fb_info *info){	struct drm_fb_helper *helper = info->par;	struct drm_framebuffer *fb = helper->fb;	struct tegra_bo *bo = tegra_fb_get_plane(fb, 0); 	drm_fb_helper_fini(helper); 	/* Undo the special mapping we made in fbdev probe. */	if (bo->pages) {		vunmap(bo->vaddr);		bo->vaddr = NULL;	}	drm_framebuffer_remove(fb); 	drm_client_release(&helper->client);	drm_fb_helper_unprepare(helper);	kfree(helper);} static const struct fb_ops tegra_fb_ops = {	.owner = THIS_MODULE,	__FB_DEFAULT_DMAMEM_OPS_RDWR,	DRM_FB_HELPER_DEFAULT_OPS,	__FB_DEFAULT_DMAMEM_OPS_DRAW,	.fb_mmap = tegra_fb_mmap,	.fb_destroy = tegra_fbdev_fb_destroy,}; static int tegra_fbdev_probe(struct drm_fb_helper *helper,			     struct drm_fb_helper_surface_size *sizes){	struct tegra_drm *tegra = helper->dev->dev_private;	struct drm_device *drm = helper->dev;	struct drm_mode_fb_cmd2 cmd = { 0 };	unsigned int bytes_per_pixel;	struct drm_framebuffer *fb;	unsigned long offset;	struct fb_info *info;	struct tegra_bo *bo;	size_t size;	int err; 	bytes_per_pixel = DIV_ROUND_UP(sizes->surface_bpp, 8); 	cmd.width = sizes->surface_width;	cmd.height = sizes->surface_height;	cmd.pitches[0] = round_up(sizes->surface_width * bytes_per_pixel,				  tegra->pitch_align); 	cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,						     sizes->surface_depth); 	size = cmd.pitches[0] * cmd.height; 	bo = tegra_bo_create(drm, size, 0);	if (IS_ERR(bo))		return PTR_ERR(bo); 	info = drm_fb_helper_alloc_info(helper);	if (IS_ERR(info)) {		dev_err(drm->dev, "failed to allocate framebuffer info\n");		drm_gem_object_put(&bo->gem);		return PTR_ERR(info);	} 	fb = tegra_fb_alloc(drm, &cmd, &bo, 1);	if (IS_ERR(fb)) {		err = PTR_ERR(fb);		dev_err(drm->dev, "failed to allocate DRM framebuffer: %d\n",			err);		drm_gem_object_put(&bo->gem);		return PTR_ERR(fb);	} 	helper->fb = fb;	helper->info = info; 	info->fbops = &tegra_fb_ops; 	drm_fb_helper_fill_info(info, helper, sizes); 	offset = info->var.xoffset * bytes_per_pixel +		 info->var.yoffset * fb->pitches[0]; 	if (bo->pages) {		bo->vaddr = vmap(bo->pages, bo->num_pages, VM_MAP,				 pgprot_writecombine(PAGE_KERNEL));		if (!bo->vaddr) {			dev_err(drm->dev, "failed to vmap() framebuffer\n");			err = -ENOMEM;			goto destroy;		}	} 	info->flags |= FBINFO_VIRTFB;	info->screen_buffer = bo->vaddr + offset;	info->screen_size = size;	info->fix.smem_start = (unsigned long)(bo->iova + offset);	info->fix.smem_len = size; 	return 0; destroy:	drm_framebuffer_remove(fb);	return err;} static const struct drm_fb_helper_funcs tegra_fb_helper_funcs = {	.fb_probe = tegra_fbdev_probe,}; /* * struct drm_client */ static void tegra_fbdev_client_unregister(struct drm_client_dev *client){	struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client); 	if (fb_helper->info) {		drm_fb_helper_unregister_info(fb_helper);	} else {		drm_client_release(&fb_helper->client);		drm_fb_helper_unprepare(fb_helper);		kfree(fb_helper);	}} static int tegra_fbdev_client_restore(struct drm_client_dev *client){	drm_fb_helper_lastclose(client->dev); 	return 0;} static int tegra_fbdev_client_hotplug(struct drm_client_dev *client){	struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);	struct drm_device *dev = client->dev;	int ret; 	if (dev->fb_helper)		return drm_fb_helper_hotplug_event(dev->fb_helper); 	ret = drm_fb_helper_init(dev, fb_helper);	if (ret)		goto err_drm_err; 	if (!drm_drv_uses_atomic_modeset(dev))		drm_helper_disable_unused_functions(dev); 	ret = drm_fb_helper_initial_config(fb_helper);	if (ret)		goto err_drm_fb_helper_fini; 	return 0; err_drm_fb_helper_fini:	drm_fb_helper_fini(fb_helper);err_drm_err:	drm_err(dev, "Failed to setup fbdev emulation (ret=%d)\n", ret);	return ret;} static const struct drm_client_funcs tegra_fbdev_client_funcs = {	.owner		= THIS_MODULE,	.unregister	= tegra_fbdev_client_unregister,	.restore	= tegra_fbdev_client_restore,	.hotplug	= tegra_fbdev_client_hotplug,}; void tegra_fbdev_setup(struct drm_device *dev){	struct drm_fb_helper *helper;	int ret; 	drm_WARN(dev, !dev->registered, "Device has not been registered.\n");	drm_WARN(dev, dev->fb_helper, "fb_helper is already set!\n"); 	helper = kzalloc(sizeof(*helper), GFP_KERNEL);	if (!helper)		return;	drm_fb_helper_prepare(dev, helper, 32, &tegra_fb_helper_funcs); 	ret = drm_client_init(dev, &helper->client, "fbdev", &tegra_fbdev_client_funcs);	if (ret)		goto err_drm_client_init; 	drm_client_register(&helper->client); 	return; err_drm_client_init:	drm_fb_helper_unprepare(helper);	kfree(helper);}