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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 <linux/console.h>
22
23#include "exynos_drm_drv.h"
24#include "exynos_drm_fb.h"
25#include "exynos_drm_fbdev.h"
26#include "exynos_drm_iommu.h"
27
28#define MAX_CONNECTOR 4
29#define PREFERRED_BPP 32
30
31#define to_exynos_fbdev(x) container_of(x, struct exynos_drm_fbdev,\
32 drm_fb_helper)
33
34struct exynos_drm_fbdev {
35 struct drm_fb_helper drm_fb_helper;
36 struct exynos_drm_gem *exynos_gem;
37};
38
39static int exynos_drm_fb_mmap(struct fb_info *info,
40 struct vm_area_struct *vma)
41{
42 struct drm_fb_helper *helper = info->par;
43 struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(helper);
44 struct exynos_drm_gem *exynos_gem = exynos_fbd->exynos_gem;
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 > exynos_gem->size)
53 return -EINVAL;
54
55 ret = dma_mmap_attrs(to_dma_dev(helper->dev), vma, exynos_gem->cookie,
56 exynos_gem->dma_addr, exynos_gem->size,
57 exynos_gem->dma_attrs);
58 if (ret < 0) {
59 DRM_ERROR("failed to mmap.\n");
60 return ret;
61 }
62
63 return 0;
64}
65
66static struct fb_ops exynos_drm_fb_ops = {
67 .owner = THIS_MODULE,
68 DRM_FB_HELPER_DEFAULT_OPS,
69 .fb_mmap = exynos_drm_fb_mmap,
70 .fb_fillrect = drm_fb_helper_cfb_fillrect,
71 .fb_copyarea = drm_fb_helper_cfb_copyarea,
72 .fb_imageblit = drm_fb_helper_cfb_imageblit,
73};
74
75static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
76 struct drm_fb_helper_surface_size *sizes,
77 struct exynos_drm_gem *exynos_gem)
78{
79 struct fb_info *fbi;
80 struct drm_framebuffer *fb = helper->fb;
81 unsigned int size = fb->width * fb->height * fb->format->cpp[0];
82 unsigned int nr_pages;
83 unsigned long offset;
84
85 fbi = drm_fb_helper_alloc_fbi(helper);
86 if (IS_ERR(fbi)) {
87 DRM_ERROR("failed to allocate fb info.\n");
88 return PTR_ERR(fbi);
89 }
90
91 fbi->par = helper;
92 fbi->flags = FBINFO_FLAG_DEFAULT;
93 fbi->fbops = &exynos_drm_fb_ops;
94
95 drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->format->depth);
96 drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height);
97
98 nr_pages = exynos_gem->size >> PAGE_SHIFT;
99
100 exynos_gem->kvaddr = (void __iomem *) vmap(exynos_gem->pages, nr_pages,
101 VM_MAP, pgprot_writecombine(PAGE_KERNEL));
102 if (!exynos_gem->kvaddr) {
103 DRM_ERROR("failed to map pages to kernel space.\n");
104 return -EIO;
105 }
106
107 offset = fbi->var.xoffset * fb->format->cpp[0];
108 offset += fbi->var.yoffset * fb->pitches[0];
109
110 fbi->screen_base = exynos_gem->kvaddr + offset;
111 fbi->screen_size = size;
112 fbi->fix.smem_len = size;
113
114 return 0;
115}
116
117static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
118 struct drm_fb_helper_surface_size *sizes)
119{
120 struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
121 struct exynos_drm_gem *exynos_gem;
122 struct drm_device *dev = helper->dev;
123 struct drm_mode_fb_cmd2 mode_cmd = { 0 };
124 unsigned long size;
125 int ret;
126
127 DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n",
128 sizes->surface_width, sizes->surface_height,
129 sizes->surface_bpp);
130
131 mode_cmd.width = sizes->surface_width;
132 mode_cmd.height = sizes->surface_height;
133 mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
134 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
135 sizes->surface_depth);
136
137 size = mode_cmd.pitches[0] * mode_cmd.height;
138
139 exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_CONTIG, size);
140
141
142
143
144
145 if (IS_ERR(exynos_gem) && is_drm_iommu_supported(dev)) {
146 dev_warn(dev->dev, "contiguous FB allocation failed, falling back to non-contiguous\n");
147 exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_NONCONTIG,
148 size);
149 }
150
151 if (IS_ERR(exynos_gem))
152 return PTR_ERR(exynos_gem);
153
154 exynos_fbdev->exynos_gem = exynos_gem;
155
156 helper->fb =
157 exynos_drm_framebuffer_init(dev, &mode_cmd, &exynos_gem, 1);
158 if (IS_ERR(helper->fb)) {
159 DRM_ERROR("failed to create drm framebuffer.\n");
160 ret = PTR_ERR(helper->fb);
161 goto err_destroy_gem;
162 }
163
164 ret = exynos_drm_fbdev_update(helper, sizes, exynos_gem);
165 if (ret < 0)
166 goto err_destroy_framebuffer;
167
168 return ret;
169
170err_destroy_framebuffer:
171 drm_framebuffer_cleanup(helper->fb);
172err_destroy_gem:
173 exynos_drm_gem_destroy(exynos_gem);
174
175
176
177
178
179
180
181 return ret;
182}
183
184static const struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
185 .fb_probe = exynos_drm_fbdev_create,
186};
187
188int exynos_drm_fbdev_init(struct drm_device *dev)
189{
190 struct exynos_drm_fbdev *fbdev;
191 struct exynos_drm_private *private = dev->dev_private;
192 struct drm_fb_helper *helper;
193 int ret;
194
195 if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector)
196 return 0;
197
198 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
199 if (!fbdev)
200 return -ENOMEM;
201
202 private->fb_helper = helper = &fbdev->drm_fb_helper;
203
204 drm_fb_helper_prepare(dev, helper, &exynos_drm_fb_helper_funcs);
205
206 ret = drm_fb_helper_init(dev, helper, MAX_CONNECTOR);
207 if (ret < 0) {
208 DRM_ERROR("failed to initialize drm fb helper.\n");
209 goto err_init;
210 }
211
212 ret = drm_fb_helper_single_add_all_connectors(helper);
213 if (ret < 0) {
214 DRM_ERROR("failed to register drm_fb_helper_connector.\n");
215 goto err_setup;
216
217 }
218
219 ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
220 if (ret < 0) {
221 DRM_ERROR("failed to set up hw configuration.\n");
222 goto err_setup;
223 }
224
225 return 0;
226
227err_setup:
228 drm_fb_helper_fini(helper);
229
230err_init:
231 private->fb_helper = NULL;
232 kfree(fbdev);
233
234 return ret;
235}
236
237static void exynos_drm_fbdev_destroy(struct drm_device *dev,
238 struct drm_fb_helper *fb_helper)
239{
240 struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(fb_helper);
241 struct exynos_drm_gem *exynos_gem = exynos_fbd->exynos_gem;
242 struct drm_framebuffer *fb;
243
244 vunmap(exynos_gem->kvaddr);
245
246
247 if (fb_helper->fb && fb_helper->fb->funcs) {
248 fb = fb_helper->fb;
249 if (fb)
250 drm_framebuffer_remove(fb);
251 }
252
253 drm_fb_helper_unregister_fbi(fb_helper);
254
255 drm_fb_helper_fini(fb_helper);
256}
257
258void exynos_drm_fbdev_fini(struct drm_device *dev)
259{
260 struct exynos_drm_private *private = dev->dev_private;
261 struct exynos_drm_fbdev *fbdev;
262
263 if (!private || !private->fb_helper)
264 return;
265
266 fbdev = to_exynos_fbdev(private->fb_helper);
267
268 exynos_drm_fbdev_destroy(dev, private->fb_helper);
269 kfree(fbdev);
270 private->fb_helper = NULL;
271}
272
273void exynos_drm_fbdev_suspend(struct drm_device *dev)
274{
275 struct exynos_drm_private *private = dev->dev_private;
276
277 console_lock();
278 drm_fb_helper_set_suspend(private->fb_helper, 1);
279 console_unlock();
280}
281
282void exynos_drm_fbdev_resume(struct drm_device *dev)
283{
284 struct exynos_drm_private *private = dev->dev_private;
285
286 console_lock();
287 drm_fb_helper_set_suspend(private->fb_helper, 0);
288 console_unlock();
289}
290
