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 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
13 */
14
15 #include <drm/drmP.h>
16 #include <drm/drm_crtc.h>
17 #include <drm/drm_fb_helper.h>
18 #include <drm/drm_crtc_helper.h>
19 #include <drm/exynos_drm.h>
20
21 #include "exynos_drm_drv.h"
22 #include "exynos_drm_fb.h"
23 #include "exynos_drm_fbdev.h"
24 #include "exynos_drm_iommu.h"
25
26 #define MAX_CONNECTOR 4
27 #define PREFERRED_BPP 32
28
29 #define to_exynos_fbdev(x) container_of(x, struct exynos_drm_fbdev,\
30 drm_fb_helper)
31
32 struct exynos_drm_fbdev {
33 struct drm_fb_helper drm_fb_helper;
34 struct exynos_drm_gem *exynos_gem;
35 };
36
exynos_drm_fb_mmap(struct fb_info * info,struct vm_area_struct * vma)37 static int exynos_drm_fb_mmap(struct fb_info *info,
38 struct vm_area_struct *vma)
39 {
40 struct drm_fb_helper *helper = info->par;
41 struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(helper);
42 struct exynos_drm_gem *exynos_gem = exynos_fbd->exynos_gem;
43 unsigned long vm_size;
44 int ret;
45
46 vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
47
48 vm_size = vma->vm_end - vma->vm_start;
49
50 if (vm_size > exynos_gem->size)
51 return -EINVAL;
52
53 ret = dma_mmap_attrs(to_dma_dev(helper->dev), vma, exynos_gem->cookie,
54 exynos_gem->dma_addr, exynos_gem->size,
55 exynos_gem->dma_attrs);
56 if (ret < 0) {
57 DRM_ERROR("failed to mmap.\n");
58 return ret;
59 }
60
61 return 0;
62 }
63
64 static struct fb_ops exynos_drm_fb_ops = {
65 .owner = THIS_MODULE,
66 .fb_mmap = exynos_drm_fb_mmap,
67 .fb_fillrect = drm_fb_helper_cfb_fillrect,
68 .fb_copyarea = drm_fb_helper_cfb_copyarea,
69 .fb_imageblit = drm_fb_helper_cfb_imageblit,
70 .fb_check_var = drm_fb_helper_check_var,
71 .fb_set_par = drm_fb_helper_set_par,
72 .fb_blank = drm_fb_helper_blank,
73 .fb_pan_display = drm_fb_helper_pan_display,
74 .fb_setcmap = drm_fb_helper_setcmap,
75 };
76
exynos_drm_fbdev_update(struct drm_fb_helper * helper,struct drm_fb_helper_surface_size * sizes,struct exynos_drm_gem * exynos_gem)77 static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
78 struct drm_fb_helper_surface_size *sizes,
79 struct exynos_drm_gem *exynos_gem)
80 {
81 struct fb_info *fbi;
82 struct drm_framebuffer *fb = helper->fb;
83 unsigned int size = fb->width * fb->height * (fb->bits_per_pixel >> 3);
84 unsigned int nr_pages;
85 unsigned long offset;
86
87 fbi = drm_fb_helper_alloc_fbi(helper);
88 if (IS_ERR(fbi)) {
89 DRM_ERROR("failed to allocate fb info.\n");
90 return PTR_ERR(fbi);
91 }
92
93 fbi->par = helper;
94 fbi->flags = FBINFO_FLAG_DEFAULT;
95 fbi->fbops = &exynos_drm_fb_ops;
96
97 drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
98 drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height);
99
100 nr_pages = exynos_gem->size >> PAGE_SHIFT;
101
102 exynos_gem->kvaddr = (void __iomem *) vmap(exynos_gem->pages, nr_pages,
103 VM_MAP, pgprot_writecombine(PAGE_KERNEL));
104 if (!exynos_gem->kvaddr) {
105 DRM_ERROR("failed to map pages to kernel space.\n");
106 drm_fb_helper_release_fbi(helper);
107 return -EIO;
108 }
109
110 offset = fbi->var.xoffset * (fb->bits_per_pixel >> 3);
111 offset += fbi->var.yoffset * fb->pitches[0];
112
113 fbi->screen_base = exynos_gem->kvaddr + offset;
114 fbi->screen_size = size;
115 fbi->fix.smem_len = size;
116
117 return 0;
118 }
119
exynos_drm_fbdev_create(struct drm_fb_helper * helper,struct drm_fb_helper_surface_size * sizes)120 static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
121 struct drm_fb_helper_surface_size *sizes)
122 {
123 struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
124 struct exynos_drm_gem *exynos_gem;
125 struct drm_device *dev = helper->dev;
126 struct drm_mode_fb_cmd2 mode_cmd = { 0 };
127 struct platform_device *pdev = dev->platformdev;
128 unsigned long size;
129 int ret;
130
131 DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n",
132 sizes->surface_width, sizes->surface_height,
133 sizes->surface_bpp);
134
135 mode_cmd.width = sizes->surface_width;
136 mode_cmd.height = sizes->surface_height;
137 mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
138 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
139 sizes->surface_depth);
140
141 size = mode_cmd.pitches[0] * mode_cmd.height;
142
143 exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_CONTIG, size);
144 /*
145 * If physically contiguous memory allocation fails and if IOMMU is
146 * supported then try to get buffer from non physically contiguous
147 * memory area.
148 */
149 if (IS_ERR(exynos_gem) && is_drm_iommu_supported(dev)) {
150 dev_warn(&pdev->dev, "contiguous FB allocation failed, falling back to non-contiguous\n");
151 exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_NONCONTIG,
152 size);
153 }
154
155 if (IS_ERR(exynos_gem))
156 return PTR_ERR(exynos_gem);
157
158 exynos_fbdev->exynos_gem = exynos_gem;
159
160 helper->fb =
161 exynos_drm_framebuffer_init(dev, &mode_cmd, &exynos_gem, 1);
162 if (IS_ERR(helper->fb)) {
163 DRM_ERROR("failed to create drm framebuffer.\n");
164 ret = PTR_ERR(helper->fb);
165 goto err_destroy_gem;
166 }
167
168 ret = exynos_drm_fbdev_update(helper, sizes, exynos_gem);
169 if (ret < 0)
170 goto err_destroy_framebuffer;
171
172 return ret;
173
174 err_destroy_framebuffer:
175 drm_framebuffer_cleanup(helper->fb);
176 err_destroy_gem:
177 exynos_drm_gem_destroy(exynos_gem);
178
179 /*
180 * if failed, all resources allocated above would be released by
181 * drm_mode_config_cleanup() when drm_load() had been called prior
182 * to any specific driver such as fimd or hdmi driver.
183 */
184
185 return ret;
186 }
187
188 static const struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
189 .fb_probe = exynos_drm_fbdev_create,
190 };
191
exynos_drm_fbdev_is_anything_connected(struct drm_device * dev)192 static bool exynos_drm_fbdev_is_anything_connected(struct drm_device *dev)
193 {
194 struct drm_connector *connector;
195 bool ret = false;
196
197 mutex_lock(&dev->mode_config.mutex);
198 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
199 if (connector->status != connector_status_connected)
200 continue;
201
202 ret = true;
203 break;
204 }
205 mutex_unlock(&dev->mode_config.mutex);
206
207 return ret;
208 }
209
exynos_drm_fbdev_init(struct drm_device * dev)210 int exynos_drm_fbdev_init(struct drm_device *dev)
211 {
212 struct exynos_drm_fbdev *fbdev;
213 struct exynos_drm_private *private = dev->dev_private;
214 struct drm_fb_helper *helper;
215 unsigned int num_crtc;
216 int ret;
217
218 if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector)
219 return 0;
220
221 if (!exynos_drm_fbdev_is_anything_connected(dev))
222 return 0;
223
224 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
225 if (!fbdev)
226 return -ENOMEM;
227
228 private->fb_helper = helper = &fbdev->drm_fb_helper;
229
230 drm_fb_helper_prepare(dev, helper, &exynos_drm_fb_helper_funcs);
231
232 num_crtc = dev->mode_config.num_crtc;
233
234 ret = drm_fb_helper_init(dev, helper, num_crtc, MAX_CONNECTOR);
235 if (ret < 0) {
236 DRM_ERROR("failed to initialize drm fb helper.\n");
237 goto err_init;
238 }
239
240 ret = drm_fb_helper_single_add_all_connectors(helper);
241 if (ret < 0) {
242 DRM_ERROR("failed to register drm_fb_helper_connector.\n");
243 goto err_setup;
244
245 }
246
247 ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
248 if (ret < 0) {
249 DRM_ERROR("failed to set up hw configuration.\n");
250 goto err_setup;
251 }
252
253 return 0;
254
255 err_setup:
256 drm_fb_helper_fini(helper);
257
258 err_init:
259 private->fb_helper = NULL;
260 kfree(fbdev);
261
262 return ret;
263 }
264
exynos_drm_fbdev_destroy(struct drm_device * dev,struct drm_fb_helper * fb_helper)265 static void exynos_drm_fbdev_destroy(struct drm_device *dev,
266 struct drm_fb_helper *fb_helper)
267 {
268 struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(fb_helper);
269 struct exynos_drm_gem *exynos_gem = exynos_fbd->exynos_gem;
270 struct drm_framebuffer *fb;
271
272 vunmap(exynos_gem->kvaddr);
273
274 /* release drm framebuffer and real buffer */
275 if (fb_helper->fb && fb_helper->fb->funcs) {
276 fb = fb_helper->fb;
277 if (fb) {
278 drm_framebuffer_unregister_private(fb);
279 drm_framebuffer_remove(fb);
280 }
281 }
282
283 drm_fb_helper_unregister_fbi(fb_helper);
284 drm_fb_helper_release_fbi(fb_helper);
285
286 drm_fb_helper_fini(fb_helper);
287 }
288
exynos_drm_fbdev_fini(struct drm_device * dev)289 void exynos_drm_fbdev_fini(struct drm_device *dev)
290 {
291 struct exynos_drm_private *private = dev->dev_private;
292 struct exynos_drm_fbdev *fbdev;
293
294 if (!private || !private->fb_helper)
295 return;
296
297 fbdev = to_exynos_fbdev(private->fb_helper);
298
299 exynos_drm_fbdev_destroy(dev, private->fb_helper);
300 kfree(fbdev);
301 private->fb_helper = NULL;
302 }
303
exynos_drm_fbdev_restore_mode(struct drm_device * dev)304 void exynos_drm_fbdev_restore_mode(struct drm_device *dev)
305 {
306 struct exynos_drm_private *private = dev->dev_private;
307
308 if (!private || !private->fb_helper)
309 return;
310
311 drm_fb_helper_restore_fbdev_mode_unlocked(private->fb_helper);
312 }
313
exynos_drm_output_poll_changed(struct drm_device * dev)314 void exynos_drm_output_poll_changed(struct drm_device *dev)
315 {
316 struct exynos_drm_private *private = dev->dev_private;
317 struct drm_fb_helper *fb_helper = private->fb_helper;
318
319 if (fb_helper)
320 drm_fb_helper_hotplug_event(fb_helper);
321 else
322 exynos_drm_fbdev_init(dev);
323 }
324