1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2012-2013 Avionic Design GmbH
4 * Copyright (C) 2012 NVIDIA CORPORATION. All rights reserved.
5 *
6 * Based on the KMS/FB DMA helpers
7 * Copyright (C) 2012 Analog Devices Inc.
8 */
9
10#include <linux/console.h>
11#include <linux/fb.h>
12#include <linux/vmalloc.h>
13
14#include <drm/drm_drv.h>
15#include <drm/drm_crtc_helper.h>
16#include <drm/drm_fb_helper.h>
17#include <drm/drm_fourcc.h>
18#include <drm/drm_framebuffer.h>
19#include <drm/drm_gem_framebuffer_helper.h>
20#include <drm/drm_modeset_helper.h>
21
22#include "drm.h"
23#include "gem.h"
24
25static int tegra_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
26{
27 struct drm_fb_helper *helper = info->par;
28 struct tegra_bo *bo;
29 int err;
30
31 bo = tegra_fb_get_plane(framebuffer: helper->fb, index: 0);
32
33 err = drm_gem_mmap_obj(obj: &bo->gem, obj_size: bo->gem.size, vma);
34 if (err < 0)
35 return err;
36
37 return __tegra_gem_mmap(gem: &bo->gem, vma);
38}
39
40static void tegra_fbdev_fb_destroy(struct fb_info *info)
41{
42 struct drm_fb_helper *helper = info->par;
43 struct drm_framebuffer *fb = helper->fb;
44 struct tegra_bo *bo = tegra_fb_get_plane(framebuffer: fb, index: 0);
45
46 drm_fb_helper_fini(helper);
47
48 /* Undo the special mapping we made in fbdev probe. */
49 if (bo->pages) {
50 vunmap(addr: bo->vaddr);
51 bo->vaddr = NULL;
52 }
53 drm_framebuffer_remove(fb);
54
55 drm_client_release(client: &helper->client);
56}
57
58static const struct fb_ops tegra_fb_ops = {
59 .owner = THIS_MODULE,
60 __FB_DEFAULT_DMAMEM_OPS_RDWR,
61 DRM_FB_HELPER_DEFAULT_OPS,
62 __FB_DEFAULT_DMAMEM_OPS_DRAW,
63 .fb_mmap = tegra_fb_mmap,
64 .fb_destroy = tegra_fbdev_fb_destroy,
65};
66
67static const struct drm_fb_helper_funcs tegra_fbdev_helper_funcs = {
68};
69
70int tegra_fbdev_driver_fbdev_probe(struct drm_fb_helper *helper,
71 struct drm_fb_helper_surface_size *sizes)
72{
73 struct tegra_drm *tegra = helper->dev->dev_private;
74 struct drm_device *drm = helper->dev;
75 struct drm_mode_fb_cmd2 cmd = { 0 };
76 struct fb_info *info = helper->info;
77 unsigned int bytes_per_pixel;
78 struct drm_framebuffer *fb;
79 unsigned long offset;
80 struct tegra_bo *bo;
81 size_t size;
82 int err;
83
84 bytes_per_pixel = DIV_ROUND_UP(sizes->surface_bpp, 8);
85
86 cmd.width = sizes->surface_width;
87 cmd.height = sizes->surface_height;
88 cmd.pitches[0] = round_up(sizes->surface_width * bytes_per_pixel,
89 tegra->pitch_align);
90
91 cmd.pixel_format = drm_mode_legacy_fb_format(bpp: sizes->surface_bpp,
92 depth: sizes->surface_depth);
93
94 size = cmd.pitches[0] * cmd.height;
95
96 bo = tegra_bo_create(drm, size, flags: 0);
97 if (IS_ERR(ptr: bo))
98 return PTR_ERR(ptr: bo);
99
100 fb = tegra_fb_alloc(drm,
101 info: drm_get_format_info(dev: drm, pixel_format: cmd.pixel_format, modifier: cmd.modifier[0]),
102 mode_cmd: &cmd, planes: &bo, num_planes: 1);
103 if (IS_ERR(ptr: fb)) {
104 err = PTR_ERR(ptr: fb);
105 dev_err(drm->dev, "failed to allocate DRM framebuffer: %d\n",
106 err);
107 drm_gem_object_put(obj: &bo->gem);
108 return PTR_ERR(ptr: fb);
109 }
110
111 helper->funcs = &tegra_fbdev_helper_funcs;
112 helper->fb = fb;
113 helper->info = info;
114
115 info->fbops = &tegra_fb_ops;
116
117 drm_fb_helper_fill_info(info, fb_helper: helper, sizes);
118
119 offset = info->var.xoffset * bytes_per_pixel +
120 info->var.yoffset * fb->pitches[0];
121
122 if (bo->pages) {
123 bo->vaddr = vmap(pages: bo->pages, count: bo->num_pages, VM_MAP,
124 pgprot_writecombine(PAGE_KERNEL));
125 if (!bo->vaddr) {
126 dev_err(drm->dev, "failed to vmap() framebuffer\n");
127 err = -ENOMEM;
128 goto destroy;
129 }
130 }
131
132 info->flags |= FBINFO_VIRTFB;
133 info->screen_buffer = bo->vaddr + offset;
134 info->screen_size = size;
135 info->fix.smem_start = (unsigned long)(bo->iova + offset);
136 info->fix.smem_len = size;
137
138 return 0;
139
140destroy:
141 drm_framebuffer_remove(fb);
142 return err;
143}
144

source code of linux/drivers/gpu/drm/tegra/fbdev.c