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
17 static 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
25 struct msm_fbdev {
26 struct drm_fb_helper base;
27 struct drm_framebuffer *fb;
28 };
29
30 static 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
msm_fbdev_mmap(struct fb_info * info,struct vm_area_struct * vma)45 static 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
msm_fbdev_create(struct drm_fb_helper * helper,struct drm_fb_helper_surface_size * sizes)54 static 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 mutex_lock(&dev->struct_mutex);
85
86 /*
87 * NOTE: if we can be guaranteed to be able to map buffer
88 * in panic (ie. lock-safe, etc) we could avoid pinning the
89 * buffer now:
90 */
91 ret = msm_gem_get_and_pin_iova(bo, priv->kms->aspace, &paddr);
92 if (ret) {
93 DRM_DEV_ERROR(dev->dev, "failed to get buffer obj iova: %d\n", ret);
94 goto fail_unlock;
95 }
96
97 fbi = drm_fb_helper_alloc_fbi(helper);
98 if (IS_ERR(fbi)) {
99 DRM_DEV_ERROR(dev->dev, "failed to allocate fb info\n");
100 ret = PTR_ERR(fbi);
101 goto fail_unlock;
102 }
103
104 DBG("fbi=%p, dev=%p", fbi, dev);
105
106 fbdev->fb = fb;
107 helper->fb = fb;
108
109 fbi->fbops = &msm_fb_ops;
110
111 drm_fb_helper_fill_info(fbi, helper, sizes);
112
113 dev->mode_config.fb_base = paddr;
114
115 fbi->screen_base = msm_gem_get_vaddr(bo);
116 if (IS_ERR(fbi->screen_base)) {
117 ret = PTR_ERR(fbi->screen_base);
118 goto fail_unlock;
119 }
120 fbi->screen_size = bo->size;
121 fbi->fix.smem_start = paddr;
122 fbi->fix.smem_len = bo->size;
123
124 DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres);
125 DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height);
126
127 mutex_unlock(&dev->struct_mutex);
128
129 return 0;
130
131 fail_unlock:
132 mutex_unlock(&dev->struct_mutex);
133 drm_framebuffer_remove(fb);
134 return ret;
135 }
136
137 static const struct drm_fb_helper_funcs msm_fb_helper_funcs = {
138 .fb_probe = msm_fbdev_create,
139 };
140
141 /* initialize fbdev helper */
msm_fbdev_init(struct drm_device * dev)142 struct drm_fb_helper *msm_fbdev_init(struct drm_device *dev)
143 {
144 struct msm_drm_private *priv = dev->dev_private;
145 struct msm_fbdev *fbdev = NULL;
146 struct drm_fb_helper *helper;
147 int ret;
148
149 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
150 if (!fbdev)
151 goto fail;
152
153 helper = &fbdev->base;
154
155 drm_fb_helper_prepare(dev, helper, &msm_fb_helper_funcs);
156
157 ret = drm_fb_helper_init(dev, helper);
158 if (ret) {
159 DRM_DEV_ERROR(dev->dev, "could not init fbdev: ret=%d\n", ret);
160 goto fail;
161 }
162
163 /* the fw fb could be anywhere in memory */
164 ret = drm_aperture_remove_framebuffers(false, dev->driver);
165 if (ret)
166 goto fini;
167
168 ret = drm_fb_helper_initial_config(helper, 32);
169 if (ret)
170 goto fini;
171
172 priv->fbdev = helper;
173
174 return helper;
175
176 fini:
177 drm_fb_helper_fini(helper);
178 fail:
179 kfree(fbdev);
180 return NULL;
181 }
182
msm_fbdev_free(struct drm_device * dev)183 void msm_fbdev_free(struct drm_device *dev)
184 {
185 struct msm_drm_private *priv = dev->dev_private;
186 struct drm_fb_helper *helper = priv->fbdev;
187 struct msm_fbdev *fbdev;
188
189 DBG();
190
191 drm_fb_helper_unregister_fbi(helper);
192
193 drm_fb_helper_fini(helper);
194
195 fbdev = to_msm_fbdev(priv->fbdev);
196
197 /* this will free the backing object */
198 if (fbdev->fb) {
199 struct drm_gem_object *bo =
200 msm_framebuffer_bo(fbdev->fb, 0);
201 msm_gem_put_vaddr(bo);
202 drm_framebuffer_remove(fbdev->fb);
203 }
204
205 kfree(fbdev);
206
207 priv->fbdev = NULL;
208 }
209