Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
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linux
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2013 Red Hat
4 * Author: Rob Clark <robdclark@gmail.com>
5 */
6
7#include <drm/drm_aperture.h>
8#include <drm/drm_crtc.h>
9#include <drm/drm_fb_helper.h>
10#include <drm/drm_fourcc.h>
11#include <drm/drm_prime.h>
12
13#include "msm_drv.h"
14#include "msm_gem.h"
15#include "msm_kms.h"
16
17static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma);
18
19/*
20 * fbdev funcs, to implement legacy fbdev interface on top of drm driver
21 */
22
23#define to_msm_fbdev(x) container_of(x, struct msm_fbdev, base)
24
25struct msm_fbdev {
26 struct drm_fb_helper base;
27 struct drm_framebuffer *fb;
28};
29
30static const struct fb_ops msm_fb_ops = {
31 .owner = THIS_MODULE,
32 DRM_FB_HELPER_DEFAULT_OPS,
33
34 /* Note: to properly handle manual update displays, we wrap the
35 * basic fbdev ops which write to the framebuffer
36 */
37 .fb_read = drm_fb_helper_sys_read,
38 .fb_write = drm_fb_helper_sys_write,
39 .fb_fillrect = drm_fb_helper_sys_fillrect,
40 .fb_copyarea = drm_fb_helper_sys_copyarea,
41 .fb_imageblit = drm_fb_helper_sys_imageblit,
42 .fb_mmap = msm_fbdev_mmap,
43};
44
45static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma)
46{
47 struct drm_fb_helper *helper = (struct drm_fb_helper *)info->par;
48 struct msm_fbdev *fbdev = to_msm_fbdev(helper);
49 struct drm_gem_object *bo = msm_framebuffer_bo(fbdev->fb, 0);
50
51 return drm_gem_prime_mmap(bo, vma);
52}
53
54static int msm_fbdev_create(struct drm_fb_helper *helper,
55 struct drm_fb_helper_surface_size *sizes)
56{
57 struct msm_fbdev *fbdev = to_msm_fbdev(helper);
58 struct drm_device *dev = helper->dev;
59 struct msm_drm_private *priv = dev->dev_private;
60 struct drm_framebuffer *fb = NULL;
61 struct drm_gem_object *bo;
62 struct fb_info *fbi = NULL;
63 uint64_t paddr;
64 uint32_t format;
65 int ret, pitch;
66
67 format = drm_mode_legacy_fb_format(sizes->surface_bpp, sizes->surface_depth);
68
69 DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width,
70 sizes->surface_height, sizes->surface_bpp,
71 sizes->fb_width, sizes->fb_height);
72
73 pitch = align_pitch(sizes->surface_width, sizes->surface_bpp);
74 fb = msm_alloc_stolen_fb(dev, sizes->surface_width,
75 sizes->surface_height, pitch, format);
76
77 if (IS_ERR(fb)) {
78 DRM_DEV_ERROR(dev->dev, "failed to allocate fb\n");
79 return PTR_ERR(fb);
80 }
81
82 bo = msm_framebuffer_bo(fb, 0);
83
84 /*
85 * NOTE: if we can be guaranteed to be able to map buffer
86 * in panic (ie. lock-safe, etc) we could avoid pinning the
87 * buffer now:
88 */
89 ret = msm_gem_get_and_pin_iova(bo, priv->kms->aspace, &paddr);
90 if (ret) {
91 DRM_DEV_ERROR(dev->dev, "failed to get buffer obj iova: %d\n", ret);
92 goto fail;
93 }
94
95 fbi = drm_fb_helper_alloc_fbi(helper);
96 if (IS_ERR(fbi)) {
97 DRM_DEV_ERROR(dev->dev, "failed to allocate fb info\n");
98 ret = PTR_ERR(fbi);
99 goto fail;
100 }
101
102 DBG("fbi=%p, dev=%p", fbi, dev);
103
104 fbdev->fb = fb;
105 helper->fb = fb;
106
107 fbi->fbops = &msm_fb_ops;
108
109 drm_fb_helper_fill_info(fbi, helper, sizes);
110
111 dev->mode_config.fb_base = paddr;
112
113 fbi->screen_base = msm_gem_get_vaddr(bo);
114 if (IS_ERR(fbi->screen_base)) {
115 ret = PTR_ERR(fbi->screen_base);
116 goto fail;
117 }
118 fbi->screen_size = bo->size;
119 fbi->fix.smem_start = paddr;
120 fbi->fix.smem_len = bo->size;
121
122 DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres);
123 DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height);
124
125 return 0;
126
127fail:
128 drm_framebuffer_remove(fb);
129 return ret;
130}
131
132static const struct drm_fb_helper_funcs msm_fb_helper_funcs = {
133 .fb_probe = msm_fbdev_create,
134};
135
136/* initialize fbdev helper */
137struct drm_fb_helper *msm_fbdev_init(struct drm_device *dev)
138{
139 struct msm_drm_private *priv = dev->dev_private;
140 struct msm_fbdev *fbdev = NULL;
141 struct drm_fb_helper *helper;
142 int ret;
143
144 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
145 if (!fbdev)
146 goto fail;
147
148 helper = &fbdev->base;
149
150 drm_fb_helper_prepare(dev, helper, &msm_fb_helper_funcs);
151
152 ret = drm_fb_helper_init(dev, helper);
153 if (ret) {
154 DRM_DEV_ERROR(dev->dev, "could not init fbdev: ret=%d\n", ret);
155 goto fail;
156 }
157
158 /* the fw fb could be anywhere in memory */
159 ret = drm_aperture_remove_framebuffers(false, dev->driver);
160 if (ret)
161 goto fini;
162
163 ret = drm_fb_helper_initial_config(helper, 32);
164 if (ret)
165 goto fini;
166
167 priv->fbdev = helper;
168
169 return helper;
170
171fini:
172 drm_fb_helper_fini(helper);
173fail:
174 kfree(fbdev);
175 return NULL;
176}
177
178void msm_fbdev_free(struct drm_device *dev)
179{
180 struct msm_drm_private *priv = dev->dev_private;
181 struct drm_fb_helper *helper = priv->fbdev;
182 struct msm_fbdev *fbdev;
183
184 DBG();
185
186 drm_fb_helper_unregister_fbi(helper);
187
188 drm_fb_helper_fini(helper);
189
190 fbdev = to_msm_fbdev(priv->fbdev);
191
192 /* this will free the backing object */
193 if (fbdev->fb) {
194 struct drm_gem_object *bo =
195 msm_framebuffer_bo(fbdev->fb, 0);
196 msm_gem_put_vaddr(bo);
197 drm_framebuffer_remove(fbdev->fb);
198 }
199
200 kfree(fbdev);
201
202 priv->fbdev = NULL;
203}