1 /* exynos_drm_fbdev.c
2 *
3 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
4 * Authors:
5 * Inki Dae <inki.dae@samsung.com>
6 * Joonyoung Shim <jy0922.shim@samsung.com>
7 * Seung-Woo Kim <sw0312.kim@samsung.com>
8 *
9 * Permission is hereby granted, free of charge, to any person obtaining a
10 * copy of this software and associated documentation files (the "Software"),
11 * to deal in the Software without restriction, including without limitation
12 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
13 * and/or sell copies of the Software, and to permit persons to whom the
14 * Software is furnished to do so, subject to the following conditions:
15 *
16 * The above copyright notice and this permission notice (including the next
17 * paragraph) shall be included in all copies or substantial portions of the
18 * Software.
19 *
20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
21 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
23 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
24 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
25 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
26 * OTHER DEALINGS IN THE SOFTWARE.
27 */
28
29 #include "drmP.h"
30 #include "drm_crtc.h"
31 #include "drm_fb_helper.h"
32 #include "drm_crtc_helper.h"
33
34 #include "exynos_drm_drv.h"
35 #include "exynos_drm_fb.h"
36 #include "exynos_drm_gem.h"
37
38 #define MAX_CONNECTOR 4
39 #define PREFERRED_BPP 32
40
41 #define to_exynos_fbdev(x) container_of(x, struct exynos_drm_fbdev,\
42 drm_fb_helper)
43
44 struct exynos_drm_fbdev {
45 struct drm_fb_helper drm_fb_helper;
46 struct exynos_drm_gem_obj *exynos_gem_obj;
47 };
48
49 static struct fb_ops exynos_drm_fb_ops = {
50 .owner = THIS_MODULE,
51 .fb_fillrect = cfb_fillrect,
52 .fb_copyarea = cfb_copyarea,
53 .fb_imageblit = cfb_imageblit,
54 .fb_check_var = drm_fb_helper_check_var,
55 .fb_set_par = drm_fb_helper_set_par,
56 .fb_blank = drm_fb_helper_blank,
57 .fb_pan_display = drm_fb_helper_pan_display,
58 .fb_setcmap = drm_fb_helper_setcmap,
59 };
60
exynos_drm_fbdev_update(struct drm_fb_helper * helper,struct drm_framebuffer * fb)61 static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
62 struct drm_framebuffer *fb)
63 {
64 struct fb_info *fbi = helper->fbdev;
65 struct drm_device *dev = helper->dev;
66 struct exynos_drm_gem_buf *buffer;
67 unsigned int size = fb->width * fb->height * (fb->bits_per_pixel >> 3);
68 unsigned long offset;
69
70 DRM_DEBUG_KMS("%s\n", __FILE__);
71
72 drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
73 drm_fb_helper_fill_var(fbi, helper, fb->width, fb->height);
74
75 /* RGB formats use only one buffer */
76 buffer = exynos_drm_fb_buffer(fb, 0);
77 if (!buffer) {
78 DRM_LOG_KMS("buffer is null.\n");
79 return -EFAULT;
80 }
81
82 offset = fbi->var.xoffset * (fb->bits_per_pixel >> 3);
83 offset += fbi->var.yoffset * fb->pitches[0];
84
85 dev->mode_config.fb_base = (resource_size_t)buffer->dma_addr;
86 fbi->screen_base = buffer->kvaddr + offset;
87 fbi->fix.smem_start = (unsigned long)(buffer->dma_addr + offset);
88 fbi->screen_size = size;
89 fbi->fix.smem_len = size;
90
91 return 0;
92 }
93
exynos_drm_fbdev_create(struct drm_fb_helper * helper,struct drm_fb_helper_surface_size * sizes)94 static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
95 struct drm_fb_helper_surface_size *sizes)
96 {
97 struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
98 struct exynos_drm_gem_obj *exynos_gem_obj;
99 struct drm_device *dev = helper->dev;
100 struct fb_info *fbi;
101 struct drm_mode_fb_cmd2 mode_cmd = { 0 };
102 struct platform_device *pdev = dev->platformdev;
103 unsigned long size;
104 int ret;
105
106 DRM_DEBUG_KMS("%s\n", __FILE__);
107
108 DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n",
109 sizes->surface_width, sizes->surface_height,
110 sizes->surface_bpp);
111
112 mode_cmd.width = sizes->surface_width;
113 mode_cmd.height = sizes->surface_height;
114 mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
115 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
116 sizes->surface_depth);
117
118 mutex_lock(&dev->struct_mutex);
119
120 fbi = framebuffer_alloc(0, &pdev->dev);
121 if (!fbi) {
122 DRM_ERROR("failed to allocate fb info.\n");
123 ret = -ENOMEM;
124 goto out;
125 }
126
127 size = mode_cmd.pitches[0] * mode_cmd.height;
128 exynos_gem_obj = exynos_drm_gem_create(dev, size);
129 if (IS_ERR(exynos_gem_obj)) {
130 ret = PTR_ERR(exynos_gem_obj);
131 goto out;
132 }
133
134 exynos_fbdev->exynos_gem_obj = exynos_gem_obj;
135
136 helper->fb = exynos_drm_framebuffer_init(dev, &mode_cmd,
137 &exynos_gem_obj->base);
138 if (IS_ERR_OR_NULL(helper->fb)) {
139 DRM_ERROR("failed to create drm framebuffer.\n");
140 ret = PTR_ERR(helper->fb);
141 goto out;
142 }
143
144 helper->fbdev = fbi;
145
146 fbi->par = helper;
147 fbi->flags = FBINFO_FLAG_DEFAULT;
148 fbi->fbops = &exynos_drm_fb_ops;
149
150 ret = fb_alloc_cmap(&fbi->cmap, 256, 0);
151 if (ret) {
152 DRM_ERROR("failed to allocate cmap.\n");
153 goto out;
154 }
155
156 ret = exynos_drm_fbdev_update(helper, helper->fb);
157 if (ret < 0) {
158 fb_dealloc_cmap(&fbi->cmap);
159 goto out;
160 }
161
162 /*
163 * if failed, all resources allocated above would be released by
164 * drm_mode_config_cleanup() when drm_load() had been called prior
165 * to any specific driver such as fimd or hdmi driver.
166 */
167 out:
168 mutex_unlock(&dev->struct_mutex);
169 return ret;
170 }
171
exynos_drm_fbdev_probe(struct drm_fb_helper * helper,struct drm_fb_helper_surface_size * sizes)172 static int exynos_drm_fbdev_probe(struct drm_fb_helper *helper,
173 struct drm_fb_helper_surface_size *sizes)
174 {
175 int ret = 0;
176
177 DRM_DEBUG_KMS("%s\n", __FILE__);
178
179 /*
180 * with !helper->fb, it means that this funcion is called first time
181 * and after that, the helper->fb would be used as clone mode.
182 */
183 if (!helper->fb) {
184 ret = exynos_drm_fbdev_create(helper, sizes);
185 if (ret < 0) {
186 DRM_ERROR("failed to create fbdev.\n");
187 return ret;
188 }
189
190 /*
191 * fb_helper expects a value more than 1 if succeed
192 * because register_framebuffer() should be called.
193 */
194 ret = 1;
195 }
196
197 return ret;
198 }
199
200 static struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
201 .fb_probe = exynos_drm_fbdev_probe,
202 };
203
exynos_drm_fbdev_init(struct drm_device * dev)204 int exynos_drm_fbdev_init(struct drm_device *dev)
205 {
206 struct exynos_drm_fbdev *fbdev;
207 struct exynos_drm_private *private = dev->dev_private;
208 struct drm_fb_helper *helper;
209 unsigned int num_crtc;
210 int ret;
211
212 DRM_DEBUG_KMS("%s\n", __FILE__);
213
214 if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector)
215 return 0;
216
217 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
218 if (!fbdev) {
219 DRM_ERROR("failed to allocate drm fbdev.\n");
220 return -ENOMEM;
221 }
222
223 private->fb_helper = helper = &fbdev->drm_fb_helper;
224 helper->funcs = &exynos_drm_fb_helper_funcs;
225
226 num_crtc = dev->mode_config.num_crtc;
227
228 ret = drm_fb_helper_init(dev, helper, num_crtc, MAX_CONNECTOR);
229 if (ret < 0) {
230 DRM_ERROR("failed to initialize drm fb helper.\n");
231 goto err_init;
232 }
233
234 ret = drm_fb_helper_single_add_all_connectors(helper);
235 if (ret < 0) {
236 DRM_ERROR("failed to register drm_fb_helper_connector.\n");
237 goto err_setup;
238
239 }
240
241 ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
242 if (ret < 0) {
243 DRM_ERROR("failed to set up hw configuration.\n");
244 goto err_setup;
245 }
246
247 return 0;
248
249 err_setup:
250 drm_fb_helper_fini(helper);
251
252 err_init:
253 private->fb_helper = NULL;
254 kfree(fbdev);
255
256 return ret;
257 }
258
exynos_drm_fbdev_destroy(struct drm_device * dev,struct drm_fb_helper * fb_helper)259 static void exynos_drm_fbdev_destroy(struct drm_device *dev,
260 struct drm_fb_helper *fb_helper)
261 {
262 struct drm_framebuffer *fb;
263
264 /* release drm framebuffer and real buffer */
265 if (fb_helper->fb && fb_helper->fb->funcs) {
266 fb = fb_helper->fb;
267 if (fb && fb->funcs->destroy)
268 fb->funcs->destroy(fb);
269 }
270
271 /* release linux framebuffer */
272 if (fb_helper->fbdev) {
273 struct fb_info *info;
274 int ret;
275
276 info = fb_helper->fbdev;
277 ret = unregister_framebuffer(info);
278 if (ret < 0)
279 DRM_DEBUG_KMS("failed unregister_framebuffer()\n");
280
281 if (info->cmap.len)
282 fb_dealloc_cmap(&info->cmap);
283
284 framebuffer_release(info);
285 }
286
287 drm_fb_helper_fini(fb_helper);
288 }
289
exynos_drm_fbdev_fini(struct drm_device * dev)290 void exynos_drm_fbdev_fini(struct drm_device *dev)
291 {
292 struct exynos_drm_private *private = dev->dev_private;
293 struct exynos_drm_fbdev *fbdev;
294
295 if (!private || !private->fb_helper)
296 return;
297
298 fbdev = to_exynos_fbdev(private->fb_helper);
299
300 if (fbdev->exynos_gem_obj)
301 exynos_drm_gem_destroy(fbdev->exynos_gem_obj);
302
303 exynos_drm_fbdev_destroy(dev, private->fb_helper);
304 kfree(fbdev);
305 private->fb_helper = NULL;
306 }
307
exynos_drm_fbdev_restore_mode(struct drm_device * dev)308 void exynos_drm_fbdev_restore_mode(struct drm_device *dev)
309 {
310 struct exynos_drm_private *private = dev->dev_private;
311
312 if (!private || !private->fb_helper)
313 return;
314
315 drm_fb_helper_restore_fbdev_mode(private->fb_helper);
316 }
317
exynos_drm_fbdev_reinit(struct drm_device * dev)318 int exynos_drm_fbdev_reinit(struct drm_device *dev)
319 {
320 struct exynos_drm_private *private = dev->dev_private;
321 struct drm_fb_helper *fb_helper;
322 int ret;
323
324 if (!private)
325 return -EINVAL;
326
327 /*
328 * if all sub drivers were unloaded then num_connector is 0
329 * so at this time, the framebuffers also should be destroyed.
330 */
331 if (!dev->mode_config.num_connector) {
332 exynos_drm_fbdev_fini(dev);
333 return 0;
334 }
335
336 fb_helper = private->fb_helper;
337
338 if (fb_helper) {
339 struct list_head temp_list;
340
341 INIT_LIST_HEAD(&temp_list);
342
343 /*
344 * fb_helper is reintialized but kernel fb is reused
345 * so kernel_fb_list need to be backuped and restored
346 */
347 if (!list_empty(&fb_helper->kernel_fb_list))
348 list_replace_init(&fb_helper->kernel_fb_list,
349 &temp_list);
350
351 drm_fb_helper_fini(fb_helper);
352
353 ret = drm_fb_helper_init(dev, fb_helper,
354 dev->mode_config.num_crtc, MAX_CONNECTOR);
355 if (ret < 0) {
356 DRM_ERROR("failed to initialize drm fb helper\n");
357 return ret;
358 }
359
360 if (!list_empty(&temp_list))
361 list_replace(&temp_list, &fb_helper->kernel_fb_list);
362
363 ret = drm_fb_helper_single_add_all_connectors(fb_helper);
364 if (ret < 0) {
365 DRM_ERROR("failed to add fb helper to connectors\n");
366 goto err;
367 }
368
369 ret = drm_fb_helper_initial_config(fb_helper, PREFERRED_BPP);
370 if (ret < 0) {
371 DRM_ERROR("failed to set up hw configuration.\n");
372 goto err;
373 }
374 } else {
375 /*
376 * if drm_load() failed whem drm load() was called prior
377 * to specific drivers, fb_helper must be NULL and so
378 * this fuction should be called again to re-initialize and
379 * re-configure the fb helper. it means that this function
380 * has been called by the specific drivers.
381 */
382 ret = exynos_drm_fbdev_init(dev);
383 }
384
385 return ret;
386
387 err:
388 /*
389 * if drm_load() failed when drm load() was called prior
390 * to specific drivers, the fb_helper must be NULL and so check it.
391 */
392 if (fb_helper)
393 drm_fb_helper_fini(fb_helper);
394
395 return ret;
396 }
397
398 MODULE_AUTHOR("Inki Dae <inki.dae@samsung.com>");
399 MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
400 MODULE_AUTHOR("Seung-Woo Kim <sw0312.kim@samsung.com>");
401 MODULE_DESCRIPTION("Samsung SoC DRM FBDEV Driver");
402 MODULE_LICENSE("GPL");
403