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11#include <linux/console.h>
12#include <linux/dma-mapping.h>
13#include <linux/vmalloc.h>
14
15#include <drm/drm_crtc.h>
16#include <drm/drm_fb_helper.h>
17#include <drm/drm_fourcc.h>
18#include <drm/drm_probe_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
25#define MAX_CONNECTOR 4
26#define PREFERRED_BPP 32
27
28#define to_exynos_fbdev(x) container_of(x, struct exynos_drm_fbdev,\
29 drm_fb_helper)
30
31struct exynos_drm_fbdev {
32 struct drm_fb_helper drm_fb_helper;
33 struct exynos_drm_gem *exynos_gem;
34};
35
36static int exynos_drm_fb_mmap(struct fb_info *info,
37 struct vm_area_struct *vma)
38{
39 struct drm_fb_helper *helper = info->par;
40 struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(helper);
41 struct exynos_drm_gem *exynos_gem = exynos_fbd->exynos_gem;
42 unsigned long vm_size;
43 int ret;
44
45 vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
46
47 vm_size = vma->vm_end - vma->vm_start;
48
49 if (vm_size > exynos_gem->size)
50 return -EINVAL;
51
52 ret = dma_mmap_attrs(to_dma_dev(helper->dev), vma, exynos_gem->cookie,
53 exynos_gem->dma_addr, exynos_gem->size,
54 exynos_gem->dma_attrs);
55 if (ret < 0) {
56 DRM_DEV_ERROR(to_dma_dev(helper->dev), "failed to mmap.\n");
57 return ret;
58 }
59
60 return 0;
61}
62
63static struct fb_ops exynos_drm_fb_ops = {
64 .owner = THIS_MODULE,
65 DRM_FB_HELPER_DEFAULT_OPS,
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};
71
72static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
73 struct drm_fb_helper_surface_size *sizes,
74 struct exynos_drm_gem *exynos_gem)
75{
76 struct fb_info *fbi;
77 struct drm_framebuffer *fb = helper->fb;
78 unsigned int size = fb->width * fb->height * fb->format->cpp[0];
79 unsigned int nr_pages;
80 unsigned long offset;
81
82 fbi = drm_fb_helper_alloc_fbi(helper);
83 if (IS_ERR(fbi)) {
84 DRM_DEV_ERROR(to_dma_dev(helper->dev),
85 "failed to allocate fb info.\n");
86 return PTR_ERR(fbi);
87 }
88
89 fbi->fbops = &exynos_drm_fb_ops;
90
91 drm_fb_helper_fill_info(fbi, helper, sizes);
92
93 nr_pages = exynos_gem->size >> PAGE_SHIFT;
94
95 exynos_gem->kvaddr = (void __iomem *) vmap(exynos_gem->pages, nr_pages,
96 VM_MAP, pgprot_writecombine(PAGE_KERNEL));
97 if (!exynos_gem->kvaddr) {
98 DRM_DEV_ERROR(to_dma_dev(helper->dev),
99 "failed to map pages to kernel space.\n");
100 return -EIO;
101 }
102
103 offset = fbi->var.xoffset * fb->format->cpp[0];
104 offset += fbi->var.yoffset * fb->pitches[0];
105
106 fbi->screen_base = exynos_gem->kvaddr + offset;
107 fbi->screen_size = size;
108 fbi->fix.smem_len = size;
109
110 return 0;
111}
112
113static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
114 struct drm_fb_helper_surface_size *sizes)
115{
116 struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
117 struct exynos_drm_gem *exynos_gem;
118 struct drm_device *dev = helper->dev;
119 struct drm_mode_fb_cmd2 mode_cmd = { 0 };
120 unsigned long size;
121 int ret;
122
123 DRM_DEV_DEBUG_KMS(dev->dev,
124 "surface width(%d), height(%d) and bpp(%d\n",
125 sizes->surface_width, sizes->surface_height,
126 sizes->surface_bpp);
127
128 mode_cmd.width = sizes->surface_width;
129 mode_cmd.height = sizes->surface_height;
130 mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
131 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
132 sizes->surface_depth);
133
134 size = mode_cmd.pitches[0] * mode_cmd.height;
135
136 exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_CONTIG, size);
137
138
139
140
141
142 if (IS_ERR(exynos_gem) && is_drm_iommu_supported(dev)) {
143 dev_warn(dev->dev, "contiguous FB allocation failed, falling back to non-contiguous\n");
144 exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_NONCONTIG,
145 size);
146 }
147
148 if (IS_ERR(exynos_gem))
149 return PTR_ERR(exynos_gem);
150
151 exynos_fbdev->exynos_gem = exynos_gem;
152
153 helper->fb =
154 exynos_drm_framebuffer_init(dev, &mode_cmd, &exynos_gem, 1);
155 if (IS_ERR(helper->fb)) {
156 DRM_DEV_ERROR(dev->dev, "failed to create drm framebuffer.\n");
157 ret = PTR_ERR(helper->fb);
158 goto err_destroy_gem;
159 }
160
161 ret = exynos_drm_fbdev_update(helper, sizes, exynos_gem);
162 if (ret < 0)
163 goto err_destroy_framebuffer;
164
165 return ret;
166
167err_destroy_framebuffer:
168 drm_framebuffer_cleanup(helper->fb);
169err_destroy_gem:
170 exynos_drm_gem_destroy(exynos_gem);
171
172
173
174
175
176
177
178 return ret;
179}
180
181static const struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
182 .fb_probe = exynos_drm_fbdev_create,
183};
184
185int exynos_drm_fbdev_init(struct drm_device *dev)
186{
187 struct exynos_drm_fbdev *fbdev;
188 struct exynos_drm_private *private = dev->dev_private;
189 struct drm_fb_helper *helper;
190 int ret;
191
192 if (!dev->mode_config.num_crtc)
193 return 0;
194
195 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
196 if (!fbdev)
197 return -ENOMEM;
198
199 private->fb_helper = helper = &fbdev->drm_fb_helper;
200
201 drm_fb_helper_prepare(dev, helper, &exynos_drm_fb_helper_funcs);
202
203 ret = drm_fb_helper_init(dev, helper, MAX_CONNECTOR);
204 if (ret < 0) {
205 DRM_DEV_ERROR(dev->dev,
206 "failed to initialize drm fb helper.\n");
207 goto err_init;
208 }
209
210 ret = drm_fb_helper_single_add_all_connectors(helper);
211 if (ret < 0) {
212 DRM_DEV_ERROR(dev->dev,
213 "failed to register drm_fb_helper_connector.\n");
214 goto err_setup;
215
216 }
217
218 ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
219 if (ret < 0) {
220 DRM_DEV_ERROR(dev->dev,
221 "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
273
