1 /*
2 * Copyright 2012 Red Hat
3 *
4 * This file is subject to the terms and conditions of the GNU General
5 * Public License version 2. See the file COPYING in the main
6 * directory of this archive for more details.
7 *
8 * Authors: Matthew Garrett
9 * Dave Airlie
10 */
11 #include <linux/module.h>
12 #include <drm/drmP.h>
13 #include <drm/drm_fb_helper.h>
14 #include <drm/drm_crtc_helper.h>
15
16 #include "cirrus_drv.h"
17
cirrus_dirty_update(struct cirrus_fbdev * afbdev,int x,int y,int width,int height)18 static void cirrus_dirty_update(struct cirrus_fbdev *afbdev,
19 int x, int y, int width, int height)
20 {
21 int i;
22 struct drm_gem_object *obj;
23 struct cirrus_bo *bo;
24 int src_offset, dst_offset;
25 int bpp = afbdev->gfb->format->cpp[0];
26 int ret = -EBUSY;
27 bool unmap = false;
28 bool store_for_later = false;
29 int x2, y2;
30 unsigned long flags;
31
32 obj = afbdev->gfb->obj[0];
33 bo = gem_to_cirrus_bo(obj);
34
35 /*
36 * try and reserve the BO, if we fail with busy
37 * then the BO is being moved and we should
38 * store up the damage until later.
39 */
40 if (drm_can_sleep())
41 ret = cirrus_bo_reserve(bo, true);
42 if (ret) {
43 if (ret != -EBUSY)
44 return;
45 store_for_later = true;
46 }
47
48 x2 = x + width - 1;
49 y2 = y + height - 1;
50 spin_lock_irqsave(&afbdev->dirty_lock, flags);
51
52 if (afbdev->y1 < y)
53 y = afbdev->y1;
54 if (afbdev->y2 > y2)
55 y2 = afbdev->y2;
56 if (afbdev->x1 < x)
57 x = afbdev->x1;
58 if (afbdev->x2 > x2)
59 x2 = afbdev->x2;
60
61 if (store_for_later) {
62 afbdev->x1 = x;
63 afbdev->x2 = x2;
64 afbdev->y1 = y;
65 afbdev->y2 = y2;
66 spin_unlock_irqrestore(&afbdev->dirty_lock, flags);
67 return;
68 }
69
70 afbdev->x1 = afbdev->y1 = INT_MAX;
71 afbdev->x2 = afbdev->y2 = 0;
72 spin_unlock_irqrestore(&afbdev->dirty_lock, flags);
73
74 if (!bo->kmap.virtual) {
75 ret = ttm_bo_kmap(&bo->bo, 0, bo->bo.num_pages, &bo->kmap);
76 if (ret) {
77 DRM_ERROR("failed to kmap fb updates\n");
78 cirrus_bo_unreserve(bo);
79 return;
80 }
81 unmap = true;
82 }
83 for (i = y; i < y + height; i++) {
84 /* assume equal stride for now */
85 src_offset = dst_offset = i * afbdev->gfb->pitches[0] + (x * bpp);
86 memcpy_toio(bo->kmap.virtual + src_offset, afbdev->sysram + src_offset, width * bpp);
87
88 }
89 if (unmap)
90 ttm_bo_kunmap(&bo->kmap);
91
92 cirrus_bo_unreserve(bo);
93 }
94
cirrus_fillrect(struct fb_info * info,const struct fb_fillrect * rect)95 static void cirrus_fillrect(struct fb_info *info,
96 const struct fb_fillrect *rect)
97 {
98 struct cirrus_fbdev *afbdev = info->par;
99 drm_fb_helper_sys_fillrect(info, rect);
100 cirrus_dirty_update(afbdev, rect->dx, rect->dy, rect->width,
101 rect->height);
102 }
103
cirrus_copyarea(struct fb_info * info,const struct fb_copyarea * area)104 static void cirrus_copyarea(struct fb_info *info,
105 const struct fb_copyarea *area)
106 {
107 struct cirrus_fbdev *afbdev = info->par;
108 drm_fb_helper_sys_copyarea(info, area);
109 cirrus_dirty_update(afbdev, area->dx, area->dy, area->width,
110 area->height);
111 }
112
cirrus_imageblit(struct fb_info * info,const struct fb_image * image)113 static void cirrus_imageblit(struct fb_info *info,
114 const struct fb_image *image)
115 {
116 struct cirrus_fbdev *afbdev = info->par;
117 drm_fb_helper_sys_imageblit(info, image);
118 cirrus_dirty_update(afbdev, image->dx, image->dy, image->width,
119 image->height);
120 }
121
122
123 static struct fb_ops cirrusfb_ops = {
124 .owner = THIS_MODULE,
125 .fb_check_var = drm_fb_helper_check_var,
126 .fb_set_par = drm_fb_helper_set_par,
127 .fb_fillrect = cirrus_fillrect,
128 .fb_copyarea = cirrus_copyarea,
129 .fb_imageblit = cirrus_imageblit,
130 .fb_pan_display = drm_fb_helper_pan_display,
131 .fb_blank = drm_fb_helper_blank,
132 .fb_setcmap = drm_fb_helper_setcmap,
133 };
134
cirrusfb_create_object(struct cirrus_fbdev * afbdev,const struct drm_mode_fb_cmd2 * mode_cmd,struct drm_gem_object ** gobj_p)135 static int cirrusfb_create_object(struct cirrus_fbdev *afbdev,
136 const struct drm_mode_fb_cmd2 *mode_cmd,
137 struct drm_gem_object **gobj_p)
138 {
139 struct drm_device *dev = afbdev->helper.dev;
140 struct cirrus_device *cdev = dev->dev_private;
141 u32 bpp;
142 u32 size;
143 struct drm_gem_object *gobj;
144 int ret = 0;
145
146 bpp = drm_format_plane_cpp(mode_cmd->pixel_format, 0) * 8;
147
148 if (!cirrus_check_framebuffer(cdev, mode_cmd->width, mode_cmd->height,
149 bpp, mode_cmd->pitches[0]))
150 return -EINVAL;
151
152 size = mode_cmd->pitches[0] * mode_cmd->height;
153 ret = cirrus_gem_create(dev, size, true, &gobj);
154 if (ret)
155 return ret;
156
157 *gobj_p = gobj;
158 return ret;
159 }
160
cirrusfb_create(struct drm_fb_helper * helper,struct drm_fb_helper_surface_size * sizes)161 static int cirrusfb_create(struct drm_fb_helper *helper,
162 struct drm_fb_helper_surface_size *sizes)
163 {
164 struct cirrus_fbdev *gfbdev =
165 container_of(helper, struct cirrus_fbdev, helper);
166 struct cirrus_device *cdev = gfbdev->helper.dev->dev_private;
167 struct fb_info *info;
168 struct drm_framebuffer *fb;
169 struct drm_mode_fb_cmd2 mode_cmd;
170 void *sysram;
171 struct drm_gem_object *gobj = NULL;
172 struct cirrus_bo *bo = NULL;
173 int size, ret;
174
175 mode_cmd.width = sizes->surface_width;
176 mode_cmd.height = sizes->surface_height;
177 mode_cmd.pitches[0] = mode_cmd.width * ((sizes->surface_bpp + 7) / 8);
178 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
179 sizes->surface_depth);
180 size = mode_cmd.pitches[0] * mode_cmd.height;
181
182 ret = cirrusfb_create_object(gfbdev, &mode_cmd, &gobj);
183 if (ret) {
184 DRM_ERROR("failed to create fbcon backing object %d\n", ret);
185 return ret;
186 }
187
188 bo = gem_to_cirrus_bo(gobj);
189
190 sysram = vmalloc(size);
191 if (!sysram)
192 return -ENOMEM;
193
194 info = drm_fb_helper_alloc_fbi(helper);
195 if (IS_ERR(info)) {
196 ret = PTR_ERR(info);
197 goto err_vfree;
198 }
199
200 info->par = gfbdev;
201
202 fb = kzalloc(sizeof(*fb), GFP_KERNEL);
203 if (!fb) {
204 ret = -ENOMEM;
205 goto err_drm_gem_object_put_unlocked;
206 }
207
208 ret = cirrus_framebuffer_init(cdev->dev, fb, &mode_cmd, gobj);
209 if (ret)
210 goto err_kfree;
211
212 gfbdev->sysram = sysram;
213 gfbdev->size = size;
214 gfbdev->gfb = fb;
215
216 /* setup helper */
217 gfbdev->helper.fb = fb;
218
219 strcpy(info->fix.id, "cirrusdrmfb");
220
221 info->fbops = &cirrusfb_ops;
222
223 drm_fb_helper_fill_fix(info, fb->pitches[0], fb->format->depth);
224 drm_fb_helper_fill_var(info, &gfbdev->helper, sizes->fb_width,
225 sizes->fb_height);
226
227 /* setup aperture base/size for vesafb takeover */
228 info->apertures->ranges[0].base = cdev->dev->mode_config.fb_base;
229 info->apertures->ranges[0].size = cdev->mc.vram_size;
230
231 info->fix.smem_start = cdev->dev->mode_config.fb_base;
232 info->fix.smem_len = cdev->mc.vram_size;
233
234 info->screen_base = sysram;
235 info->screen_size = size;
236
237 info->fix.mmio_start = 0;
238 info->fix.mmio_len = 0;
239
240 DRM_INFO("fb mappable at 0x%lX\n", info->fix.smem_start);
241 DRM_INFO("vram aper at 0x%lX\n", (unsigned long)info->fix.smem_start);
242 DRM_INFO("size %lu\n", (unsigned long)info->fix.smem_len);
243 DRM_INFO("fb depth is %d\n", fb->format->depth);
244 DRM_INFO(" pitch is %d\n", fb->pitches[0]);
245
246 return 0;
247
248 err_kfree:
249 kfree(fb);
250 err_drm_gem_object_put_unlocked:
251 drm_gem_object_put_unlocked(gobj);
252 err_vfree:
253 vfree(sysram);
254 return ret;
255 }
256
cirrus_fbdev_destroy(struct drm_device * dev,struct cirrus_fbdev * gfbdev)257 static int cirrus_fbdev_destroy(struct drm_device *dev,
258 struct cirrus_fbdev *gfbdev)
259 {
260 struct drm_framebuffer *gfb = gfbdev->gfb;
261
262 drm_fb_helper_unregister_fbi(&gfbdev->helper);
263
264 vfree(gfbdev->sysram);
265 drm_fb_helper_fini(&gfbdev->helper);
266 if (gfb)
267 drm_framebuffer_put(gfb);
268
269 return 0;
270 }
271
272 static const struct drm_fb_helper_funcs cirrus_fb_helper_funcs = {
273 .fb_probe = cirrusfb_create,
274 };
275
cirrus_fbdev_init(struct cirrus_device * cdev)276 int cirrus_fbdev_init(struct cirrus_device *cdev)
277 {
278 struct cirrus_fbdev *gfbdev;
279 int ret;
280 int bpp_sel = 24;
281
282 /*bpp_sel = 8;*/
283 gfbdev = kzalloc(sizeof(struct cirrus_fbdev), GFP_KERNEL);
284 if (!gfbdev)
285 return -ENOMEM;
286
287 cdev->mode_info.gfbdev = gfbdev;
288 spin_lock_init(&gfbdev->dirty_lock);
289
290 drm_fb_helper_prepare(cdev->dev, &gfbdev->helper,
291 &cirrus_fb_helper_funcs);
292
293 ret = drm_fb_helper_init(cdev->dev, &gfbdev->helper,
294 CIRRUSFB_CONN_LIMIT);
295 if (ret)
296 return ret;
297
298 ret = drm_fb_helper_single_add_all_connectors(&gfbdev->helper);
299 if (ret)
300 return ret;
301
302 /* disable all the possible outputs/crtcs before entering KMS mode */
303 drm_helper_disable_unused_functions(cdev->dev);
304
305 return drm_fb_helper_initial_config(&gfbdev->helper, bpp_sel);
306 }
307
cirrus_fbdev_fini(struct cirrus_device * cdev)308 void cirrus_fbdev_fini(struct cirrus_device *cdev)
309 {
310 if (!cdev->mode_info.gfbdev)
311 return;
312
313 cirrus_fbdev_destroy(cdev->dev, cdev->mode_info.gfbdev);
314 kfree(cdev->mode_info.gfbdev);
315 cdev->mode_info.gfbdev = NULL;
316 }
317