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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}; | |
62 | dma_addr_t paddr; | |
63 | int ret, size; | |
64 | ||
65 | /* only doing ARGB32 since this is what is needed to alpha-blend | |
66 | * with video overlays: | |
67 | */ | |
68 | sizes->surface_bpp = 32; | |
69 | sizes->surface_depth = 32; | |
70 | ||
71 | DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width, | |
72 | sizes->surface_height, sizes->surface_bpp, | |
73 | sizes->fb_width, sizes->fb_height); | |
74 | ||
75 | mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp, | |
76 | sizes->surface_depth); | |
77 | ||
78 | mode_cmd.width = sizes->surface_width; | |
79 | mode_cmd.height = sizes->surface_height; | |
80 | ||
81 | mode_cmd.pitches[0] = align_pitch( | |
82 | mode_cmd.width, sizes->surface_bpp); | |
83 | ||
84 | /* allocate backing bo */ | |
85 | size = mode_cmd.pitches[0] * mode_cmd.height; | |
86 | DBG("allocating %d bytes for fb %d", size, dev->primary->index); | |
87 | mutex_lock(&dev->struct_mutex); | |
88 | fbdev->bo = msm_gem_new(dev, size, MSM_BO_SCANOUT | MSM_BO_WC); | |
89 | mutex_unlock(&dev->struct_mutex); | |
90 | if (IS_ERR(fbdev->bo)) { | |
91 | ret = PTR_ERR(fbdev->bo); | |
92 | fbdev->bo = NULL; | |
93 | dev_err(dev->dev, "failed to allocate buffer object: %d\n", ret); | |
94 | goto fail; | |
95 | } | |
96 | ||
97 | fb = msm_framebuffer_init(dev, &mode_cmd, &fbdev->bo); | |
98 | if (IS_ERR(fb)) { | |
99 | dev_err(dev->dev, "failed to allocate fb\n"); | |
100 | /* note: if fb creation failed, we can't rely on fb destroy | |
101 | * to unref the bo: | |
102 | */ | |
103 | drm_gem_object_unreference(fbdev->bo); | |
104 | ret = PTR_ERR(fb); | |
105 | goto fail; | |
106 | } | |
107 | ||
108 | mutex_lock(&dev->struct_mutex); | |
109 | ||
110 | /* TODO implement our own fb_mmap so we don't need this: */ | |
111 | msm_gem_get_iova_locked(fbdev->bo, 0, &paddr); | |
112 | ||
113 | fbi = framebuffer_alloc(0, dev->dev); | |
114 | if (!fbi) { | |
115 | dev_err(dev->dev, "failed to allocate fb info\n"); | |
116 | ret = -ENOMEM; | |
117 | goto fail_unlock; | |
118 | } | |
119 | ||
120 | DBG("fbi=%p, dev=%p", fbi, dev); | |
121 | ||
122 | fbdev->fb = fb; | |
123 | helper->fb = fb; | |
124 | helper->fbdev = fbi; | |
125 | ||
126 | fbi->par = helper; | |
127 | fbi->flags = FBINFO_DEFAULT; | |
128 | fbi->fbops = &msm_fb_ops; | |
129 | ||
130 | strcpy(fbi->fix.id, "msm"); | |
131 | ||
132 | ret = fb_alloc_cmap(&fbi->cmap, 256, 0); | |
133 | if (ret) { | |
134 | ret = -ENOMEM; | |
135 | goto fail_unlock; | |
136 | } | |
137 | ||
138 | drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth); | |
139 | drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height); | |
140 | ||
141 | dev->mode_config.fb_base = paddr; | |
142 | ||
143 | fbi->screen_base = msm_gem_vaddr_locked(fbdev->bo); | |
144 | fbi->screen_size = fbdev->bo->size; | |
145 | fbi->fix.smem_start = paddr; | |
146 | fbi->fix.smem_len = fbdev->bo->size; | |
147 | ||
148 | DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres); | |
149 | DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height); | |
150 | ||
151 | mutex_unlock(&dev->struct_mutex); | |
152 | ||
153 | return 0; | |
154 | ||
155 | fail_unlock: | |
156 | mutex_unlock(&dev->struct_mutex); | |
157 | fail: | |
158 | ||
159 | if (ret) { | |
160 | if (fbi) | |
161 | framebuffer_release(fbi); | |
162 | if (fb) { | |
163 | drm_framebuffer_unregister_private(fb); | |
164 | drm_framebuffer_remove(fb); | |
165 | } | |
166 | } | |
167 | ||
168 | return ret; | |
169 | } | |
170 | ||
171 | static void msm_crtc_fb_gamma_set(struct drm_crtc *crtc, | |
172 | u16 red, u16 green, u16 blue, int regno) | |
173 | { | |
174 | DBG("fbdev: set gamma"); | |
175 | } | |
176 | ||
177 | static void msm_crtc_fb_gamma_get(struct drm_crtc *crtc, | |
178 | u16 *red, u16 *green, u16 *blue, int regno) | |
179 | { | |
180 | DBG("fbdev: get gamma"); | |
181 | } | |
182 | ||
183 | static struct drm_fb_helper_funcs msm_fb_helper_funcs = { | |
184 | .gamma_set = msm_crtc_fb_gamma_set, | |
185 | .gamma_get = msm_crtc_fb_gamma_get, | |
186 | .fb_probe = msm_fbdev_create, | |
187 | }; | |
188 | ||
189 | /* initialize fbdev helper */ | |
190 | struct drm_fb_helper *msm_fbdev_init(struct drm_device *dev) | |
191 | { | |
192 | struct msm_drm_private *priv = dev->dev_private; | |
193 | struct msm_fbdev *fbdev = NULL; | |
194 | struct drm_fb_helper *helper; | |
195 | int ret = 0; | |
196 | ||
197 | fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL); | |
198 | if (!fbdev) | |
199 | goto fail; | |
200 | ||
201 | helper = &fbdev->base; | |
202 | ||
203 | helper->funcs = &msm_fb_helper_funcs; | |
204 | ||
205 | ret = drm_fb_helper_init(dev, helper, | |
206 | priv->num_crtcs, priv->num_connectors); | |
207 | if (ret) { | |
208 | dev_err(dev->dev, "could not init fbdev: ret=%d\n", ret); | |
209 | goto fail; | |
210 | } | |
211 | ||
212 | drm_fb_helper_single_add_all_connectors(helper); | |
213 | ||
214 | /* disable all the possible outputs/crtcs before entering KMS mode */ | |
215 | drm_helper_disable_unused_functions(dev); | |
216 | ||
217 | drm_fb_helper_initial_config(helper, 32); | |
218 | ||
219 | priv->fbdev = helper; | |
220 | ||
221 | return helper; | |
222 | ||
223 | fail: | |
224 | kfree(fbdev); | |
225 | return NULL; | |
226 | } | |
227 | ||
228 | void msm_fbdev_free(struct drm_device *dev) | |
229 | { | |
230 | struct msm_drm_private *priv = dev->dev_private; | |
231 | struct drm_fb_helper *helper = priv->fbdev; | |
232 | struct msm_fbdev *fbdev; | |
233 | struct fb_info *fbi; | |
234 | ||
235 | DBG(); | |
236 | ||
237 | fbi = helper->fbdev; | |
238 | ||
239 | /* only cleanup framebuffer if it is present */ | |
240 | if (fbi) { | |
241 | unregister_framebuffer(fbi); | |
242 | framebuffer_release(fbi); | |
243 | } | |
244 | ||
245 | drm_fb_helper_fini(helper); | |
246 | ||
247 | fbdev = to_msm_fbdev(priv->fbdev); | |
248 | ||
249 | /* this will free the backing object */ | |
250 | if (fbdev->fb) { | |
251 | drm_framebuffer_unregister_private(fbdev->fb); | |
252 | drm_framebuffer_remove(fbdev->fb); | |
253 | } | |
254 | ||
255 | kfree(fbdev); | |
256 | ||
257 | priv->fbdev = NULL; | |
258 | } |