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Lars-Peter Clausen2e3b3c42012-07-02 16:37:47 +02001/*
2 * drm kms/fb cma (contiguous memory allocator) helper functions
3 *
4 * Copyright (C) 2012 Analog Device Inc.
5 * Author: Lars-Peter Clausen <lars@metafoo.de>
6 *
7 * Based on udl_fbdev.c
8 * Copyright (C) 2012 Red Hat
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version 2
13 * of the License, or (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 */
19
20#include <drm/drmP.h>
21#include <drm/drm_crtc.h>
22#include <drm/drm_fb_helper.h>
23#include <drm/drm_crtc_helper.h>
24#include <drm/drm_gem_cma_helper.h>
25#include <drm/drm_fb_cma_helper.h>
26#include <linux/module.h>
27
28struct drm_fb_cma {
29 struct drm_framebuffer fb;
30 struct drm_gem_cma_object *obj[4];
31};
32
33struct drm_fbdev_cma {
34 struct drm_fb_helper fb_helper;
35 struct drm_fb_cma *fb;
36};
37
38static inline struct drm_fbdev_cma *to_fbdev_cma(struct drm_fb_helper *helper)
39{
40 return container_of(helper, struct drm_fbdev_cma, fb_helper);
41}
42
43static inline struct drm_fb_cma *to_fb_cma(struct drm_framebuffer *fb)
44{
45 return container_of(fb, struct drm_fb_cma, fb);
46}
47
48static void drm_fb_cma_destroy(struct drm_framebuffer *fb)
49{
50 struct drm_fb_cma *fb_cma = to_fb_cma(fb);
51 int i;
52
53 for (i = 0; i < 4; i++) {
54 if (fb_cma->obj[i])
55 drm_gem_object_unreference_unlocked(&fb_cma->obj[i]->base);
56 }
57
58 drm_framebuffer_cleanup(fb);
59 kfree(fb_cma);
60}
61
62static int drm_fb_cma_create_handle(struct drm_framebuffer *fb,
63 struct drm_file *file_priv, unsigned int *handle)
64{
65 struct drm_fb_cma *fb_cma = to_fb_cma(fb);
66
67 return drm_gem_handle_create(file_priv,
68 &fb_cma->obj[0]->base, handle);
69}
70
71static struct drm_framebuffer_funcs drm_fb_cma_funcs = {
72 .destroy = drm_fb_cma_destroy,
73 .create_handle = drm_fb_cma_create_handle,
74};
75
76static struct drm_fb_cma *drm_fb_cma_alloc(struct drm_device *dev,
77 struct drm_mode_fb_cmd2 *mode_cmd, struct drm_gem_cma_object **obj,
78 unsigned int num_planes)
79{
80 struct drm_fb_cma *fb_cma;
81 int ret;
82 int i;
83
84 fb_cma = kzalloc(sizeof(*fb_cma), GFP_KERNEL);
85 if (!fb_cma)
86 return ERR_PTR(-ENOMEM);
87
88 ret = drm_framebuffer_init(dev, &fb_cma->fb, &drm_fb_cma_funcs);
89 if (ret) {
90 dev_err(dev->dev, "Failed to initalize framebuffer: %d\n", ret);
91 kfree(fb_cma);
92 return ERR_PTR(ret);
93 }
94
95 drm_helper_mode_fill_fb_struct(&fb_cma->fb, mode_cmd);
96
97 for (i = 0; i < num_planes; i++)
98 fb_cma->obj[i] = obj[i];
99
100 return fb_cma;
101}
102
103/**
104 * drm_fb_cma_create() - (struct drm_mode_config_funcs *)->fb_create callback function
105 *
106 * If your hardware has special alignment or pitch requirements these should be
107 * checked before calling this function.
108 */
109struct drm_framebuffer *drm_fb_cma_create(struct drm_device *dev,
110 struct drm_file *file_priv, struct drm_mode_fb_cmd2 *mode_cmd)
111{
112 struct drm_fb_cma *fb_cma;
113 struct drm_gem_cma_object *objs[4];
114 struct drm_gem_object *obj;
115 unsigned int hsub;
116 unsigned int vsub;
117 int ret;
118 int i;
119
120 hsub = drm_format_horz_chroma_subsampling(mode_cmd->pixel_format);
121 vsub = drm_format_vert_chroma_subsampling(mode_cmd->pixel_format);
122
123 for (i = 0; i < drm_format_num_planes(mode_cmd->pixel_format); i++) {
124 unsigned int width = mode_cmd->width / (i ? hsub : 1);
125 unsigned int height = mode_cmd->height / (i ? vsub : 1);
126 unsigned int min_size;
127
128 obj = drm_gem_object_lookup(dev, file_priv, mode_cmd->handles[i]);
129 if (!obj) {
130 dev_err(dev->dev, "Failed to lookup GEM object\n");
131 ret = -ENXIO;
132 goto err_gem_object_unreference;
133 }
134
135 min_size = (height - 1) * mode_cmd->pitches[i]
136 + width * drm_format_plane_cpp(mode_cmd->pixel_format, i)
137 + mode_cmd->offsets[i];
138
139 if (obj->size < min_size) {
140 drm_gem_object_unreference_unlocked(obj);
141 ret = -EINVAL;
142 goto err_gem_object_unreference;
143 }
144 objs[i] = to_drm_gem_cma_obj(obj);
145 }
146
147 fb_cma = drm_fb_cma_alloc(dev, mode_cmd, objs, i);
148 if (IS_ERR(fb_cma)) {
149 ret = PTR_ERR(fb_cma);
150 goto err_gem_object_unreference;
151 }
152
153 return &fb_cma->fb;
154
155err_gem_object_unreference:
156 for (i--; i >= 0; i--)
157 drm_gem_object_unreference_unlocked(&objs[i]->base);
158 return ERR_PTR(ret);
159}
160EXPORT_SYMBOL_GPL(drm_fb_cma_create);
161
162/**
163 * drm_fb_cma_get_gem_obj() - Get CMA GEM object for framebuffer
164 * @fb: The framebuffer
165 * @plane: Which plane
166 *
167 * Return the CMA GEM object for given framebuffer.
168 *
169 * This function will usually be called from the CRTC callback functions.
170 */
171struct drm_gem_cma_object *drm_fb_cma_get_gem_obj(struct drm_framebuffer *fb,
172 unsigned int plane)
173{
174 struct drm_fb_cma *fb_cma = to_fb_cma(fb);
175
176 if (plane >= 4)
177 return NULL;
178
179 return fb_cma->obj[plane];
180}
181EXPORT_SYMBOL_GPL(drm_fb_cma_get_gem_obj);
182
183static struct fb_ops drm_fbdev_cma_ops = {
184 .owner = THIS_MODULE,
185 .fb_fillrect = sys_fillrect,
186 .fb_copyarea = sys_copyarea,
187 .fb_imageblit = sys_imageblit,
188 .fb_check_var = drm_fb_helper_check_var,
189 .fb_set_par = drm_fb_helper_set_par,
190 .fb_blank = drm_fb_helper_blank,
191 .fb_pan_display = drm_fb_helper_pan_display,
192 .fb_setcmap = drm_fb_helper_setcmap,
193};
194
195static int drm_fbdev_cma_create(struct drm_fb_helper *helper,
196 struct drm_fb_helper_surface_size *sizes)
197{
198 struct drm_fbdev_cma *fbdev_cma = to_fbdev_cma(helper);
199 struct drm_mode_fb_cmd2 mode_cmd = { 0 };
200 struct drm_device *dev = helper->dev;
201 struct drm_gem_cma_object *obj;
202 struct drm_framebuffer *fb;
203 unsigned int bytes_per_pixel;
204 unsigned long offset;
205 struct fb_info *fbi;
206 size_t size;
207 int ret;
208
Thierry Redinge0d78d02012-10-20 10:32:46 +0000209 DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d)\n",
Lars-Peter Clausen2e3b3c42012-07-02 16:37:47 +0200210 sizes->surface_width, sizes->surface_height,
211 sizes->surface_bpp);
212
213 bytes_per_pixel = DIV_ROUND_UP(sizes->surface_bpp, 8);
214
215 mode_cmd.width = sizes->surface_width;
216 mode_cmd.height = sizes->surface_height;
217 mode_cmd.pitches[0] = sizes->surface_width * bytes_per_pixel;
218 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
219 sizes->surface_depth);
220
221 size = mode_cmd.pitches[0] * mode_cmd.height;
222 obj = drm_gem_cma_create(dev, size);
Thierry Reding02813242012-10-20 10:32:47 +0000223 if (IS_ERR(obj))
Lars-Peter Clausen2e3b3c42012-07-02 16:37:47 +0200224 return -ENOMEM;
225
226 fbi = framebuffer_alloc(0, dev->dev);
227 if (!fbi) {
228 dev_err(dev->dev, "Failed to allocate framebuffer info.\n");
229 ret = -ENOMEM;
230 goto err_drm_gem_cma_free_object;
231 }
232
233 fbdev_cma->fb = drm_fb_cma_alloc(dev, &mode_cmd, &obj, 1);
234 if (IS_ERR(fbdev_cma->fb)) {
235 dev_err(dev->dev, "Failed to allocate DRM framebuffer.\n");
236 ret = PTR_ERR(fbdev_cma->fb);
237 goto err_framebuffer_release;
238 }
239
240 fb = &fbdev_cma->fb->fb;
241 helper->fb = fb;
242 helper->fbdev = fbi;
243
244 fbi->par = helper;
245 fbi->flags = FBINFO_FLAG_DEFAULT;
246 fbi->fbops = &drm_fbdev_cma_ops;
247
248 ret = fb_alloc_cmap(&fbi->cmap, 256, 0);
249 if (ret) {
250 dev_err(dev->dev, "Failed to allocate color map.\n");
251 goto err_drm_fb_cma_destroy;
252 }
253
254 drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
255 drm_fb_helper_fill_var(fbi, helper, fb->width, fb->height);
256
257 offset = fbi->var.xoffset * bytes_per_pixel;
258 offset += fbi->var.yoffset * fb->pitches[0];
259
260 dev->mode_config.fb_base = (resource_size_t)obj->paddr;
261 fbi->screen_base = obj->vaddr + offset;
262 fbi->fix.smem_start = (unsigned long)(obj->paddr + offset);
263 fbi->screen_size = size;
264 fbi->fix.smem_len = size;
265
266 return 0;
267
268err_drm_fb_cma_destroy:
269 drm_fb_cma_destroy(fb);
270err_framebuffer_release:
271 framebuffer_release(fbi);
272err_drm_gem_cma_free_object:
273 drm_gem_cma_free_object(&obj->base);
274 return ret;
275}
276
277static int drm_fbdev_cma_probe(struct drm_fb_helper *helper,
278 struct drm_fb_helper_surface_size *sizes)
279{
280 int ret = 0;
281
282 if (!helper->fb) {
283 ret = drm_fbdev_cma_create(helper, sizes);
284 if (ret < 0)
285 return ret;
286 ret = 1;
287 }
288
289 return ret;
290}
291
292static struct drm_fb_helper_funcs drm_fb_cma_helper_funcs = {
293 .fb_probe = drm_fbdev_cma_probe,
294};
295
296/**
297 * drm_fbdev_cma_init() - Allocate and initializes a drm_fbdev_cma struct
298 * @dev: DRM device
299 * @preferred_bpp: Preferred bits per pixel for the device
300 * @num_crtc: Number of CRTCs
301 * @max_conn_count: Maximum number of connectors
302 *
303 * Returns a newly allocated drm_fbdev_cma struct or a ERR_PTR.
304 */
305struct drm_fbdev_cma *drm_fbdev_cma_init(struct drm_device *dev,
306 unsigned int preferred_bpp, unsigned int num_crtc,
307 unsigned int max_conn_count)
308{
309 struct drm_fbdev_cma *fbdev_cma;
310 struct drm_fb_helper *helper;
311 int ret;
312
313 fbdev_cma = kzalloc(sizeof(*fbdev_cma), GFP_KERNEL);
314 if (!fbdev_cma) {
315 dev_err(dev->dev, "Failed to allocate drm fbdev.\n");
316 return ERR_PTR(-ENOMEM);
317 }
318
319 fbdev_cma->fb_helper.funcs = &drm_fb_cma_helper_funcs;
320 helper = &fbdev_cma->fb_helper;
321
322 ret = drm_fb_helper_init(dev, helper, num_crtc, max_conn_count);
323 if (ret < 0) {
324 dev_err(dev->dev, "Failed to initialize drm fb helper.\n");
325 goto err_free;
326 }
327
328 ret = drm_fb_helper_single_add_all_connectors(helper);
329 if (ret < 0) {
330 dev_err(dev->dev, "Failed to add connectors.\n");
331 goto err_drm_fb_helper_fini;
332
333 }
334
335 ret = drm_fb_helper_initial_config(helper, preferred_bpp);
336 if (ret < 0) {
337 dev_err(dev->dev, "Failed to set inital hw configuration.\n");
338 goto err_drm_fb_helper_fini;
339 }
340
341 return fbdev_cma;
342
343err_drm_fb_helper_fini:
344 drm_fb_helper_fini(helper);
345err_free:
346 kfree(fbdev_cma);
347
348 return ERR_PTR(ret);
349}
350EXPORT_SYMBOL_GPL(drm_fbdev_cma_init);
351
352/**
353 * drm_fbdev_cma_fini() - Free drm_fbdev_cma struct
354 * @fbdev_cma: The drm_fbdev_cma struct
355 */
356void drm_fbdev_cma_fini(struct drm_fbdev_cma *fbdev_cma)
357{
358 if (fbdev_cma->fb_helper.fbdev) {
359 struct fb_info *info;
360 int ret;
361
362 info = fbdev_cma->fb_helper.fbdev;
363 ret = unregister_framebuffer(info);
364 if (ret < 0)
365 DRM_DEBUG_KMS("failed unregister_framebuffer()\n");
366
367 if (info->cmap.len)
368 fb_dealloc_cmap(&info->cmap);
369
370 framebuffer_release(info);
371 }
372
373 if (fbdev_cma->fb)
374 drm_fb_cma_destroy(&fbdev_cma->fb->fb);
375
376 drm_fb_helper_fini(&fbdev_cma->fb_helper);
377 kfree(fbdev_cma);
378}
379EXPORT_SYMBOL_GPL(drm_fbdev_cma_fini);
380
381/**
382 * drm_fbdev_cma_restore_mode() - Restores initial framebuffer mode
383 * @fbdev_cma: The drm_fbdev_cma struct, may be NULL
384 *
385 * This function is usually called from the DRM drivers lastclose callback.
386 */
387void drm_fbdev_cma_restore_mode(struct drm_fbdev_cma *fbdev_cma)
388{
389 if (fbdev_cma)
390 drm_fb_helper_restore_fbdev_mode(&fbdev_cma->fb_helper);
391}
392EXPORT_SYMBOL_GPL(drm_fbdev_cma_restore_mode);
393
394/**
395 * drm_fbdev_cma_hotplug_event() - Poll for hotpulug events
396 * @fbdev_cma: The drm_fbdev_cma struct, may be NULL
397 *
398 * This function is usually called from the DRM drivers output_poll_changed
399 * callback.
400 */
401void drm_fbdev_cma_hotplug_event(struct drm_fbdev_cma *fbdev_cma)
402{
403 if (fbdev_cma)
404 drm_fb_helper_hotplug_event(&fbdev_cma->fb_helper);
405}
406EXPORT_SYMBOL_GPL(drm_fbdev_cma_hotplug_event);