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c8afe684 RC |
1 | /* |
2 | * Copyright (C) 2013 Red Hat | |
3 | * Author: Rob Clark <robdclark@gmail.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms of the GNU General Public License version 2 as published by | |
7 | * the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License along with | |
15 | * this program. If not, see <http://www.gnu.org/licenses/>. | |
16 | */ | |
17 | ||
18 | #include "msm_drv.h" | |
19 | ||
20 | #include "drm_crtc.h" | |
21 | #include "drm_fb_helper.h" | |
22 | ||
23 | /* | |
24 | * fbdev funcs, to implement legacy fbdev interface on top of drm driver | |
25 | */ | |
26 | ||
27 | #define to_msm_fbdev(x) container_of(x, struct msm_fbdev, base) | |
28 | ||
29 | struct msm_fbdev { | |
30 | struct drm_fb_helper base; | |
31 | struct drm_framebuffer *fb; | |
32 | struct drm_gem_object *bo; | |
33 | }; | |
34 | ||
35 | static struct fb_ops msm_fb_ops = { | |
36 | .owner = THIS_MODULE, | |
37 | ||
38 | /* Note: to properly handle manual update displays, we wrap the | |
39 | * basic fbdev ops which write to the framebuffer | |
40 | */ | |
41 | .fb_read = fb_sys_read, | |
42 | .fb_write = fb_sys_write, | |
43 | .fb_fillrect = sys_fillrect, | |
44 | .fb_copyarea = sys_copyarea, | |
45 | .fb_imageblit = sys_imageblit, | |
46 | ||
47 | .fb_check_var = drm_fb_helper_check_var, | |
48 | .fb_set_par = drm_fb_helper_set_par, | |
49 | .fb_pan_display = drm_fb_helper_pan_display, | |
50 | .fb_blank = drm_fb_helper_blank, | |
51 | .fb_setcmap = drm_fb_helper_setcmap, | |
52 | }; | |
53 | ||
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 drm_framebuffer *fb = NULL; | |
60 | struct fb_info *fbi = NULL; | |
61 | struct drm_mode_fb_cmd2 mode_cmd = {0}; | |
2557e2d7 | 62 | uint32_t paddr; |
c8afe684 RC |
63 | int ret, size; |
64 | ||
c8afe684 | 65 | sizes->surface_bpp = 32; |
96673ecb | 66 | sizes->surface_depth = 24; |
c8afe684 RC |
67 | |
68 | DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width, | |
69 | sizes->surface_height, sizes->surface_bpp, | |
70 | sizes->fb_width, sizes->fb_height); | |
71 | ||
72 | mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, | |
73 | sizes->surface_depth); | |
74 | ||
75 | mode_cmd.width = sizes->surface_width; | |
76 | mode_cmd.height = sizes->surface_height; | |
77 | ||
78 | mode_cmd.pitches[0] = align_pitch( | |
79 | mode_cmd.width, sizes->surface_bpp); | |
80 | ||
81 | /* allocate backing bo */ | |
82 | size = mode_cmd.pitches[0] * mode_cmd.height; | |
83 | DBG("allocating %d bytes for fb %d", size, dev->primary->index); | |
84 | mutex_lock(&dev->struct_mutex); | |
85 | fbdev->bo = msm_gem_new(dev, size, MSM_BO_SCANOUT | MSM_BO_WC); | |
86 | mutex_unlock(&dev->struct_mutex); | |
87 | if (IS_ERR(fbdev->bo)) { | |
88 | ret = PTR_ERR(fbdev->bo); | |
89 | fbdev->bo = NULL; | |
90 | dev_err(dev->dev, "failed to allocate buffer object: %d\n", ret); | |
91 | goto fail; | |
92 | } | |
93 | ||
94 | fb = msm_framebuffer_init(dev, &mode_cmd, &fbdev->bo); | |
95 | if (IS_ERR(fb)) { | |
96 | dev_err(dev->dev, "failed to allocate fb\n"); | |
97 | /* note: if fb creation failed, we can't rely on fb destroy | |
98 | * to unref the bo: | |
99 | */ | |
100 | drm_gem_object_unreference(fbdev->bo); | |
101 | ret = PTR_ERR(fb); | |
102 | goto fail; | |
103 | } | |
104 | ||
105 | mutex_lock(&dev->struct_mutex); | |
106 | ||
107 | /* TODO implement our own fb_mmap so we don't need this: */ | |
108 | msm_gem_get_iova_locked(fbdev->bo, 0, &paddr); | |
109 | ||
110 | fbi = framebuffer_alloc(0, dev->dev); | |
111 | if (!fbi) { | |
112 | dev_err(dev->dev, "failed to allocate fb info\n"); | |
113 | ret = -ENOMEM; | |
114 | goto fail_unlock; | |
115 | } | |
116 | ||
117 | DBG("fbi=%p, dev=%p", fbi, dev); | |
118 | ||
119 | fbdev->fb = fb; | |
120 | helper->fb = fb; | |
121 | helper->fbdev = fbi; | |
122 | ||
123 | fbi->par = helper; | |
124 | fbi->flags = FBINFO_DEFAULT; | |
125 | fbi->fbops = &msm_fb_ops; | |
126 | ||
127 | strcpy(fbi->fix.id, "msm"); | |
128 | ||
129 | ret = fb_alloc_cmap(&fbi->cmap, 256, 0); | |
130 | if (ret) { | |
131 | ret = -ENOMEM; | |
132 | goto fail_unlock; | |
133 | } | |
134 | ||
135 | drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth); | |
136 | drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height); | |
137 | ||
138 | dev->mode_config.fb_base = paddr; | |
139 | ||
140 | fbi->screen_base = msm_gem_vaddr_locked(fbdev->bo); | |
141 | fbi->screen_size = fbdev->bo->size; | |
142 | fbi->fix.smem_start = paddr; | |
143 | fbi->fix.smem_len = fbdev->bo->size; | |
144 | ||
145 | DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres); | |
146 | DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height); | |
147 | ||
148 | mutex_unlock(&dev->struct_mutex); | |
149 | ||
150 | return 0; | |
151 | ||
152 | fail_unlock: | |
153 | mutex_unlock(&dev->struct_mutex); | |
154 | fail: | |
155 | ||
156 | if (ret) { | |
157 | if (fbi) | |
158 | framebuffer_release(fbi); | |
159 | if (fb) { | |
160 | drm_framebuffer_unregister_private(fb); | |
161 | drm_framebuffer_remove(fb); | |
162 | } | |
163 | } | |
164 | ||
165 | return ret; | |
166 | } | |
167 | ||
168 | static void msm_crtc_fb_gamma_set(struct drm_crtc *crtc, | |
169 | u16 red, u16 green, u16 blue, int regno) | |
170 | { | |
171 | DBG("fbdev: set gamma"); | |
172 | } | |
173 | ||
174 | static void msm_crtc_fb_gamma_get(struct drm_crtc *crtc, | |
175 | u16 *red, u16 *green, u16 *blue, int regno) | |
176 | { | |
177 | DBG("fbdev: get gamma"); | |
178 | } | |
179 | ||
180 | static struct drm_fb_helper_funcs msm_fb_helper_funcs = { | |
181 | .gamma_set = msm_crtc_fb_gamma_set, | |
182 | .gamma_get = msm_crtc_fb_gamma_get, | |
183 | .fb_probe = msm_fbdev_create, | |
184 | }; | |
185 | ||
186 | /* initialize fbdev helper */ | |
187 | struct drm_fb_helper *msm_fbdev_init(struct drm_device *dev) | |
188 | { | |
189 | struct msm_drm_private *priv = dev->dev_private; | |
190 | struct msm_fbdev *fbdev = NULL; | |
191 | struct drm_fb_helper *helper; | |
192 | int ret = 0; | |
193 | ||
194 | fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL); | |
195 | if (!fbdev) | |
196 | goto fail; | |
197 | ||
198 | helper = &fbdev->base; | |
199 | ||
200 | helper->funcs = &msm_fb_helper_funcs; | |
201 | ||
202 | ret = drm_fb_helper_init(dev, helper, | |
203 | priv->num_crtcs, priv->num_connectors); | |
204 | if (ret) { | |
205 | dev_err(dev->dev, "could not init fbdev: ret=%d\n", ret); | |
206 | goto fail; | |
207 | } | |
208 | ||
209 | drm_fb_helper_single_add_all_connectors(helper); | |
210 | ||
211 | /* disable all the possible outputs/crtcs before entering KMS mode */ | |
212 | drm_helper_disable_unused_functions(dev); | |
213 | ||
214 | drm_fb_helper_initial_config(helper, 32); | |
215 | ||
216 | priv->fbdev = helper; | |
217 | ||
218 | return helper; | |
219 | ||
220 | fail: | |
221 | kfree(fbdev); | |
222 | return NULL; | |
223 | } | |
224 | ||
225 | void msm_fbdev_free(struct drm_device *dev) | |
226 | { | |
227 | struct msm_drm_private *priv = dev->dev_private; | |
228 | struct drm_fb_helper *helper = priv->fbdev; | |
229 | struct msm_fbdev *fbdev; | |
230 | struct fb_info *fbi; | |
231 | ||
232 | DBG(); | |
233 | ||
234 | fbi = helper->fbdev; | |
235 | ||
236 | /* only cleanup framebuffer if it is present */ | |
237 | if (fbi) { | |
238 | unregister_framebuffer(fbi); | |
239 | framebuffer_release(fbi); | |
240 | } | |
241 | ||
242 | drm_fb_helper_fini(helper); | |
243 | ||
244 | fbdev = to_msm_fbdev(priv->fbdev); | |
245 | ||
246 | /* this will free the backing object */ | |
247 | if (fbdev->fb) { | |
248 | drm_framebuffer_unregister_private(fbdev->fb); | |
249 | drm_framebuffer_remove(fbdev->fb); | |
250 | } | |
251 | ||
252 | kfree(fbdev); | |
253 | ||
254 | priv->fbdev = NULL; | |
255 | } |