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_crtc.h>
8 #include <drm/drm_fb_helper.h>
9 #include <drm/drm_fourcc.h>
10
11 #include "msm_drv.h"
12 #include "msm_kms.h"
13
14 extern int msm_gem_mmap_obj(struct drm_gem_object *obj,
15 struct vm_area_struct *vma);
16 static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma);
17
18 /*
19 * fbdev funcs, to implement legacy fbdev interface on top of drm driver
20 */
21
22 #define to_msm_fbdev(x) container_of(x, struct msm_fbdev, base)
23
24 struct msm_fbdev {
25 struct drm_fb_helper base;
26 struct drm_framebuffer *fb;
27 };
28
29 static const struct fb_ops msm_fb_ops = {
30 .owner = THIS_MODULE,
31 DRM_FB_HELPER_DEFAULT_OPS,
32
33 /* Note: to properly handle manual update displays, we wrap the
34 * basic fbdev ops which write to the framebuffer
35 */
36 .fb_read = drm_fb_helper_sys_read,
37 .fb_write = drm_fb_helper_sys_write,
38 .fb_fillrect = drm_fb_helper_sys_fillrect,
39 .fb_copyarea = drm_fb_helper_sys_copyarea,
40 .fb_imageblit = drm_fb_helper_sys_imageblit,
41 .fb_mmap = msm_fbdev_mmap,
42 };
43
msm_fbdev_mmap(struct fb_info * info,struct vm_area_struct * vma)44 static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma)
45 {
46 struct drm_fb_helper *helper = (struct drm_fb_helper *)info->par;
47 struct msm_fbdev *fbdev = to_msm_fbdev(helper);
48 struct drm_gem_object *bo = msm_framebuffer_bo(fbdev->fb, 0);
49 int ret = 0;
50
51 ret = drm_gem_mmap_obj(bo, bo->size, vma);
52 if (ret) {
53 pr_err("%s:drm_gem_mmap_obj fail\n", __func__);
54 return ret;
55 }
56
57 return msm_gem_mmap_obj(bo, vma);
58 }
59
msm_fbdev_create(struct drm_fb_helper * helper,struct drm_fb_helper_surface_size * sizes)60 static int msm_fbdev_create(struct drm_fb_helper *helper,
61 struct drm_fb_helper_surface_size *sizes)
62 {
63 struct msm_fbdev *fbdev = to_msm_fbdev(helper);
64 struct drm_device *dev = helper->dev;
65 struct msm_drm_private *priv = dev->dev_private;
66 struct drm_framebuffer *fb = NULL;
67 struct drm_gem_object *bo;
68 struct fb_info *fbi = NULL;
69 uint64_t paddr;
70 uint32_t format;
71 int ret, pitch;
72
73 format = drm_mode_legacy_fb_format(sizes->surface_bpp, sizes->surface_depth);
74
75 DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width,
76 sizes->surface_height, sizes->surface_bpp,
77 sizes->fb_width, sizes->fb_height);
78
79 pitch = align_pitch(sizes->surface_width, sizes->surface_bpp);
80 fb = msm_alloc_stolen_fb(dev, sizes->surface_width,
81 sizes->surface_height, pitch, format);
82
83 if (IS_ERR(fb)) {
84 DRM_DEV_ERROR(dev->dev, "failed to allocate fb\n");
85 return PTR_ERR(fb);
86 }
87
88 bo = msm_framebuffer_bo(fb, 0);
89
90 mutex_lock(&dev->struct_mutex);
91
92 /*
93 * NOTE: if we can be guaranteed to be able to map buffer
94 * in panic (ie. lock-safe, etc) we could avoid pinning the
95 * buffer now:
96 */
97 ret = msm_gem_get_and_pin_iova(bo, priv->kms->aspace, &paddr);
98 if (ret) {
99 DRM_DEV_ERROR(dev->dev, "failed to get buffer obj iova: %d\n", ret);
100 goto fail_unlock;
101 }
102
103 fbi = drm_fb_helper_alloc_fbi(helper);
104 if (IS_ERR(fbi)) {
105 DRM_DEV_ERROR(dev->dev, "failed to allocate fb info\n");
106 ret = PTR_ERR(fbi);
107 goto fail_unlock;
108 }
109
110 DBG("fbi=%p, dev=%p", fbi, dev);
111
112 fbdev->fb = fb;
113 helper->fb = fb;
114
115 fbi->fbops = &msm_fb_ops;
116
117 drm_fb_helper_fill_info(fbi, helper, sizes);
118
119 dev->mode_config.fb_base = paddr;
120
121 fbi->screen_base = msm_gem_get_vaddr(bo);
122 if (IS_ERR(fbi->screen_base)) {
123 ret = PTR_ERR(fbi->screen_base);
124 goto fail_unlock;
125 }
126 fbi->screen_size = bo->size;
127 fbi->fix.smem_start = paddr;
128 fbi->fix.smem_len = bo->size;
129
130 DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres);
131 DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height);
132
133 mutex_unlock(&dev->struct_mutex);
134
135 return 0;
136
137 fail_unlock:
138 mutex_unlock(&dev->struct_mutex);
139 drm_framebuffer_remove(fb);
140 return ret;
141 }
142
143 static const struct drm_fb_helper_funcs msm_fb_helper_funcs = {
144 .fb_probe = msm_fbdev_create,
145 };
146
147 /* initialize fbdev helper */
msm_fbdev_init(struct drm_device * dev)148 struct drm_fb_helper *msm_fbdev_init(struct drm_device *dev)
149 {
150 struct msm_drm_private *priv = dev->dev_private;
151 struct msm_fbdev *fbdev = NULL;
152 struct drm_fb_helper *helper;
153 int ret;
154
155 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
156 if (!fbdev)
157 goto fail;
158
159 helper = &fbdev->base;
160
161 drm_fb_helper_prepare(dev, helper, &msm_fb_helper_funcs);
162
163 ret = drm_fb_helper_init(dev, helper);
164 if (ret) {
165 DRM_DEV_ERROR(dev->dev, "could not init fbdev: ret=%d\n", ret);
166 goto fail;
167 }
168
169 /* the fw fb could be anywhere in memory */
170 drm_fb_helper_remove_conflicting_framebuffers(NULL, "msm", false);
171
172 ret = drm_fb_helper_initial_config(helper, 32);
173 if (ret)
174 goto fini;
175
176 priv->fbdev = helper;
177
178 return helper;
179
180 fini:
181 drm_fb_helper_fini(helper);
182 fail:
183 kfree(fbdev);
184 return NULL;
185 }
186
msm_fbdev_free(struct drm_device * dev)187 void msm_fbdev_free(struct drm_device *dev)
188 {
189 struct msm_drm_private *priv = dev->dev_private;
190 struct drm_fb_helper *helper = priv->fbdev;
191 struct msm_fbdev *fbdev;
192
193 DBG();
194
195 drm_fb_helper_unregister_fbi(helper);
196
197 drm_fb_helper_fini(helper);
198
199 fbdev = to_msm_fbdev(priv->fbdev);
200
201 /* this will free the backing object */
202 if (fbdev->fb) {
203 struct drm_gem_object *bo =
204 msm_framebuffer_bo(fbdev->fb, 0);
205 msm_gem_put_vaddr(bo);
206 drm_framebuffer_remove(fbdev->fb);
207 }
208
209 kfree(fbdev);
210
211 priv->fbdev = NULL;
212 }
213