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_framebuffer.h>
12 #include <drm/drm_prime.h>
13
14 #include "msm_drv.h"
15 #include "msm_gem.h"
16 #include "msm_kms.h"
17
18 static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma);
19
20 /*
21 * fbdev funcs, to implement legacy fbdev interface on top of drm driver
22 */
23
24 #define to_msm_fbdev(x) container_of(x, struct msm_fbdev, base)
25
26 struct msm_fbdev {
27 struct drm_fb_helper base;
28 struct drm_framebuffer *fb;
29 };
30
31 static const struct fb_ops msm_fb_ops = {
32 .owner = THIS_MODULE,
33 DRM_FB_HELPER_DEFAULT_OPS,
34
35 /* Note: to properly handle manual update displays, we wrap the
36 * basic fbdev ops which write to the framebuffer
37 */
38 .fb_read = drm_fb_helper_sys_read,
39 .fb_write = drm_fb_helper_sys_write,
40 .fb_fillrect = drm_fb_helper_sys_fillrect,
41 .fb_copyarea = drm_fb_helper_sys_copyarea,
42 .fb_imageblit = drm_fb_helper_sys_imageblit,
43 .fb_mmap = msm_fbdev_mmap,
44 };
45
msm_fbdev_mmap(struct fb_info * info,struct vm_area_struct * vma)46 static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma)
47 {
48 struct drm_fb_helper *helper = (struct drm_fb_helper *)info->par;
49 struct msm_fbdev *fbdev = to_msm_fbdev(helper);
50 struct drm_gem_object *bo = msm_framebuffer_bo(fbdev->fb, 0);
51
52 return drm_gem_prime_mmap(bo, vma);
53 }
54
msm_fbdev_create(struct drm_fb_helper * helper,struct drm_fb_helper_surface_size * sizes)55 static int msm_fbdev_create(struct drm_fb_helper *helper,
56 struct drm_fb_helper_surface_size *sizes)
57 {
58 struct msm_fbdev *fbdev = to_msm_fbdev(helper);
59 struct drm_device *dev = helper->dev;
60 struct msm_drm_private *priv = dev->dev_private;
61 struct drm_framebuffer *fb = NULL;
62 struct drm_gem_object *bo;
63 struct fb_info *fbi = NULL;
64 uint64_t paddr;
65 uint32_t format;
66 int ret, pitch;
67
68 format = drm_mode_legacy_fb_format(sizes->surface_bpp, sizes->surface_depth);
69
70 DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width,
71 sizes->surface_height, sizes->surface_bpp,
72 sizes->fb_width, sizes->fb_height);
73
74 pitch = align_pitch(sizes->surface_width, sizes->surface_bpp);
75 fb = msm_alloc_stolen_fb(dev, sizes->surface_width,
76 sizes->surface_height, pitch, format);
77
78 if (IS_ERR(fb)) {
79 DRM_DEV_ERROR(dev->dev, "failed to allocate fb\n");
80 return PTR_ERR(fb);
81 }
82
83 bo = msm_framebuffer_bo(fb, 0);
84
85 /*
86 * NOTE: if we can be guaranteed to be able to map buffer
87 * in panic (ie. lock-safe, etc) we could avoid pinning the
88 * buffer now:
89 */
90 ret = msm_gem_get_and_pin_iova(bo, priv->kms->aspace, &paddr);
91 if (ret) {
92 DRM_DEV_ERROR(dev->dev, "failed to get buffer obj iova: %d\n", ret);
93 goto fail;
94 }
95
96 fbi = drm_fb_helper_alloc_fbi(helper);
97 if (IS_ERR(fbi)) {
98 DRM_DEV_ERROR(dev->dev, "failed to allocate fb info\n");
99 ret = PTR_ERR(fbi);
100 goto fail;
101 }
102
103 DBG("fbi=%p, dev=%p", fbi, dev);
104
105 fbdev->fb = fb;
106 helper->fb = fb;
107
108 fbi->fbops = &msm_fb_ops;
109
110 drm_fb_helper_fill_info(fbi, helper, sizes);
111
112 dev->mode_config.fb_base = paddr;
113
114 fbi->screen_base = msm_gem_get_vaddr(bo);
115 if (IS_ERR(fbi->screen_base)) {
116 ret = PTR_ERR(fbi->screen_base);
117 goto fail;
118 }
119 fbi->screen_size = bo->size;
120 fbi->fix.smem_start = paddr;
121 fbi->fix.smem_len = bo->size;
122
123 DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres);
124 DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height);
125
126 return 0;
127
128 fail:
129 drm_framebuffer_remove(fb);
130 return ret;
131 }
132
133 static const struct drm_fb_helper_funcs msm_fb_helper_funcs = {
134 .fb_probe = msm_fbdev_create,
135 };
136
137 /* initialize fbdev helper */
msm_fbdev_init(struct drm_device * dev)138 struct drm_fb_helper *msm_fbdev_init(struct drm_device *dev)
139 {
140 struct msm_drm_private *priv = dev->dev_private;
141 struct msm_fbdev *fbdev = NULL;
142 struct drm_fb_helper *helper;
143 int ret;
144
145 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
146 if (!fbdev)
147 goto fail;
148
149 helper = &fbdev->base;
150
151 drm_fb_helper_prepare(dev, helper, &msm_fb_helper_funcs);
152
153 ret = drm_fb_helper_init(dev, helper);
154 if (ret) {
155 DRM_DEV_ERROR(dev->dev, "could not init fbdev: ret=%d\n", ret);
156 goto fail;
157 }
158
159 /* the fw fb could be anywhere in memory */
160 ret = drm_aperture_remove_framebuffers(false, dev->driver);
161 if (ret)
162 goto fini;
163
164 ret = drm_fb_helper_initial_config(helper, 32);
165 if (ret)
166 goto fini;
167
168 priv->fbdev = helper;
169
170 return helper;
171
172 fini:
173 drm_fb_helper_fini(helper);
174 fail:
175 kfree(fbdev);
176 return NULL;
177 }
178
msm_fbdev_free(struct drm_device * dev)179 void msm_fbdev_free(struct drm_device *dev)
180 {
181 struct msm_drm_private *priv = dev->dev_private;
182 struct drm_fb_helper *helper = priv->fbdev;
183 struct msm_fbdev *fbdev;
184
185 DBG();
186
187 drm_fb_helper_unregister_fbi(helper);
188
189 drm_fb_helper_fini(helper);
190
191 fbdev = to_msm_fbdev(priv->fbdev);
192
193 /* this will free the backing object */
194 if (fbdev->fb) {
195 struct drm_gem_object *bo =
196 msm_framebuffer_bo(fbdev->fb, 0);
197 msm_gem_put_vaddr(bo);
198 drm_framebuffer_remove(fbdev->fb);
199 }
200
201 kfree(fbdev);
202
203 priv->fbdev = NULL;
204 }
205