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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_gem.h"
25#include "exynos_drm_iommu.h"
26
27#define MAX_CONNECTOR 4
28#define PREFERRED_BPP 32
29
30#define to_exynos_fbdev(x) container_of(x, struct exynos_drm_fbdev,\
31 drm_fb_helper)
32
33struct exynos_drm_fbdev {
34 struct drm_fb_helper drm_fb_helper;
35 struct exynos_drm_gem_obj *exynos_gem_obj;
36};
37
38static int exynos_drm_fb_mmap(struct fb_info *info,
39 struct vm_area_struct *vma)
40{
41 struct drm_fb_helper *helper = info->par;
42 struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(helper);
43 struct exynos_drm_gem_obj *exynos_gem_obj = exynos_fbd->exynos_gem_obj;
44 struct exynos_drm_gem_buf *buffer = exynos_gem_obj->buffer;
45 unsigned long vm_size;
46 int ret;
47
48 vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
49
50 vm_size = vma->vm_end - vma->vm_start;
51
52 if (vm_size > buffer->size)
53 return -EINVAL;
54
55 ret = dma_mmap_attrs(helper->dev->dev, vma, buffer->pages,
56 buffer->dma_addr, buffer->size, &buffer->dma_attrs);
57 if (ret < 0) {
58 DRM_ERROR("failed to mmap.\n");
59 return ret;
60 }
61
62 return 0;
63}
64
65static struct fb_ops exynos_drm_fb_ops = {
66 .owner = THIS_MODULE,
67 .fb_mmap = exynos_drm_fb_mmap,
68 .fb_fillrect = cfb_fillrect,
69 .fb_copyarea = cfb_copyarea,
70 .fb_imageblit = cfb_imageblit,
71 .fb_check_var = drm_fb_helper_check_var,
72 .fb_set_par = drm_fb_helper_set_par,
73 .fb_blank = drm_fb_helper_blank,
74 .fb_pan_display = drm_fb_helper_pan_display,
75 .fb_setcmap = drm_fb_helper_setcmap,
76};
77
78static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
79 struct drm_fb_helper_surface_size *sizes,
80 struct drm_framebuffer *fb)
81{
82 struct fb_info *fbi = helper->fbdev;
83 struct exynos_drm_gem_buf *buffer;
84 unsigned int size = fb->width * fb->height * (fb->bits_per_pixel >> 3);
85 unsigned int nr_pages;
86 unsigned long offset;
87
88 drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
89 drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height);
90
91
92 buffer = exynos_drm_fb_buffer(fb, 0);
93 if (!buffer) {
94 DRM_DEBUG_KMS("buffer is null.\n");
95 return -EFAULT;
96 }
97
98 nr_pages = buffer->size >> PAGE_SHIFT;
99
100 buffer->kvaddr = (void __iomem *) vmap(buffer->pages,
101 nr_pages, VM_MAP,
102 pgprot_writecombine(PAGE_KERNEL));
103 if (!buffer->kvaddr) {
104 DRM_ERROR("failed to map pages to kernel space.\n");
105 return -EIO;
106 }
107
108
109 exynos_drm_fb_set_buf_cnt(fb, 1);
110
111 offset = fbi->var.xoffset * (fb->bits_per_pixel >> 3);
112 offset += fbi->var.yoffset * fb->pitches[0];
113
114 fbi->screen_base = buffer->kvaddr + offset;
115 fbi->screen_size = size;
116 fbi->fix.smem_len = size;
117
118 return 0;
119}
120
121static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
122 struct drm_fb_helper_surface_size *sizes)
123{
124 struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
125 struct exynos_drm_gem_obj *exynos_gem_obj;
126 struct drm_device *dev = helper->dev;
127 struct fb_info *fbi;
128 struct drm_mode_fb_cmd2 mode_cmd = { 0 };
129 struct platform_device *pdev = dev->platformdev;
130 unsigned long size;
131 int ret;
132
133 DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n",
134 sizes->surface_width, sizes->surface_height,
135 sizes->surface_bpp);
136
137 mode_cmd.width = sizes->surface_width;
138 mode_cmd.height = sizes->surface_height;
139 mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
140 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
141 sizes->surface_depth);
142
143 mutex_lock(&dev->struct_mutex);
144
145 fbi = framebuffer_alloc(0, &pdev->dev);
146 if (!fbi) {
147 DRM_ERROR("failed to allocate fb info.\n");
148 ret = -ENOMEM;
149 goto out;
150 }
151
152 size = mode_cmd.pitches[0] * mode_cmd.height;
153
154 exynos_gem_obj = exynos_drm_gem_create(dev, EXYNOS_BO_CONTIG, size);
155
156
157
158
159
160 if (IS_ERR(exynos_gem_obj) && is_drm_iommu_supported(dev)) {
161 dev_warn(&pdev->dev, "contiguous FB allocation failed, falling back to non-contiguous\n");
162 exynos_gem_obj = exynos_drm_gem_create(dev, EXYNOS_BO_NONCONTIG,
163 size);
164 }
165
166 if (IS_ERR(exynos_gem_obj)) {
167 ret = PTR_ERR(exynos_gem_obj);
168 goto err_release_framebuffer;
169 }
170
171 exynos_fbdev->exynos_gem_obj = exynos_gem_obj;
172
173 helper->fb = exynos_drm_framebuffer_init(dev, &mode_cmd,
174 &exynos_gem_obj->base);
175 if (IS_ERR(helper->fb)) {
176 DRM_ERROR("failed to create drm framebuffer.\n");
177 ret = PTR_ERR(helper->fb);
178 goto err_destroy_gem;
179 }
180
181 helper->fbdev = fbi;
182
183 fbi->par = helper;
184 fbi->flags = FBINFO_FLAG_DEFAULT;
185 fbi->fbops = &exynos_drm_fb_ops;
186
187 ret = fb_alloc_cmap(&fbi->cmap, 256, 0);
188 if (ret) {
189 DRM_ERROR("failed to allocate cmap.\n");
190 goto err_destroy_framebuffer;
191 }
192
193 ret = exynos_drm_fbdev_update(helper, sizes, helper->fb);
194 if (ret < 0)
195 goto err_dealloc_cmap;
196
197 mutex_unlock(&dev->struct_mutex);
198 return ret;
199
200err_dealloc_cmap:
201 fb_dealloc_cmap(&fbi->cmap);
202err_destroy_framebuffer:
203 drm_framebuffer_cleanup(helper->fb);
204err_destroy_gem:
205 exynos_drm_gem_destroy(exynos_gem_obj);
206err_release_framebuffer:
207 framebuffer_release(fbi);
208
209
210
211
212
213
214out:
215 mutex_unlock(&dev->struct_mutex);
216 return ret;
217}
218
219static const struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
220 .fb_probe = exynos_drm_fbdev_create,
221};
222
223static bool exynos_drm_fbdev_is_anything_connected(struct drm_device *dev)
224{
225 struct drm_connector *connector;
226 bool ret = false;
227
228 mutex_lock(&dev->mode_config.mutex);
229 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
230 if (connector->status != connector_status_connected)
231 continue;
232
233 ret = true;
234 break;
235 }
236 mutex_unlock(&dev->mode_config.mutex);
237
238 return ret;
239}
240
241int exynos_drm_fbdev_init(struct drm_device *dev)
242{
243 struct exynos_drm_fbdev *fbdev;
244 struct exynos_drm_private *private = dev->dev_private;
245 struct drm_fb_helper *helper;
246 unsigned int num_crtc;
247 int ret;
248
249 if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector)
250 return 0;
251
252 if (!exynos_drm_fbdev_is_anything_connected(dev))
253 return 0;
254
255 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
256 if (!fbdev)
257 return -ENOMEM;
258
259 private->fb_helper = helper = &fbdev->drm_fb_helper;
260
261 drm_fb_helper_prepare(dev, helper, &exynos_drm_fb_helper_funcs);
262
263 num_crtc = dev->mode_config.num_crtc;
264
265 ret = drm_fb_helper_init(dev, helper, num_crtc, MAX_CONNECTOR);
266 if (ret < 0) {
267 DRM_ERROR("failed to initialize drm fb helper.\n");
268 goto err_init;
269 }
270
271 ret = drm_fb_helper_single_add_all_connectors(helper);
272 if (ret < 0) {
273 DRM_ERROR("failed to register drm_fb_helper_connector.\n");
274 goto err_setup;
275
276 }
277
278 ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
279 if (ret < 0) {
280 DRM_ERROR("failed to set up hw configuration.\n");
281 goto err_setup;
282 }
283
284 return 0;
285
286err_setup:
287 drm_fb_helper_fini(helper);
288
289err_init:
290 private->fb_helper = NULL;
291 kfree(fbdev);
292
293 return ret;
294}
295
296static void exynos_drm_fbdev_destroy(struct drm_device *dev,
297 struct drm_fb_helper *fb_helper)
298{
299 struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(fb_helper);
300 struct exynos_drm_gem_obj *exynos_gem_obj = exynos_fbd->exynos_gem_obj;
301 struct drm_framebuffer *fb;
302
303 if (exynos_gem_obj->buffer->kvaddr)
304 vunmap(exynos_gem_obj->buffer->kvaddr);
305
306
307 if (fb_helper->fb && fb_helper->fb->funcs) {
308 fb = fb_helper->fb;
309 if (fb) {
310 drm_framebuffer_unregister_private(fb);
311 drm_framebuffer_remove(fb);
312 }
313 }
314
315
316 if (fb_helper->fbdev) {
317 struct fb_info *info;
318 int ret;
319
320 info = fb_helper->fbdev;
321 ret = unregister_framebuffer(info);
322 if (ret < 0)
323 DRM_DEBUG_KMS("failed unregister_framebuffer()\n");
324
325 if (info->cmap.len)
326 fb_dealloc_cmap(&info->cmap);
327
328 framebuffer_release(info);
329 }
330
331 drm_fb_helper_fini(fb_helper);
332}
333
334void exynos_drm_fbdev_fini(struct drm_device *dev)
335{
336 struct exynos_drm_private *private = dev->dev_private;
337 struct exynos_drm_fbdev *fbdev;
338
339 if (!private || !private->fb_helper)
340 return;
341
342 fbdev = to_exynos_fbdev(private->fb_helper);
343
344 exynos_drm_fbdev_destroy(dev, private->fb_helper);
345 kfree(fbdev);
346 private->fb_helper = NULL;
347}
348
349void exynos_drm_fbdev_restore_mode(struct drm_device *dev)
350{
351 struct exynos_drm_private *private = dev->dev_private;
352
353 if (!private || !private->fb_helper)
354 return;
355
356 drm_fb_helper_restore_fbdev_mode_unlocked(private->fb_helper);
357}
358
