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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
32struct exynos_drm_fbdev {
33 struct drm_fb_helper drm_fb_helper;
34 struct exynos_drm_gem *exynos_gem;
35};
36
37static 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
64static 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
77static 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
120static 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 mutex_lock(&dev->struct_mutex);
142
143 size = mode_cmd.pitches[0] * mode_cmd.height;
144
145 exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_CONTIG, size);
146 /*
147 * If physically contiguous memory allocation fails and if IOMMU is
148 * supported then try to get buffer from non physically contiguous
149 * memory area.
150 */
151 if (IS_ERR(exynos_gem) && is_drm_iommu_supported(dev)) {
152 dev_warn(&pdev->dev, "contiguous FB allocation failed, falling back to non-contiguous\n");
153 exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_NONCONTIG,
154 size);
155 }
156
157 if (IS_ERR(exynos_gem)) {
158 ret = PTR_ERR(exynos_gem);
159 goto out;
160 }
161
162 exynos_fbdev->exynos_gem = exynos_gem;
163
164 helper->fb =
165 exynos_drm_framebuffer_init(dev, &mode_cmd, &exynos_gem, 1);
166 if (IS_ERR(helper->fb)) {
167 DRM_ERROR("failed to create drm framebuffer.\n");
168 ret = PTR_ERR(helper->fb);
169 goto err_destroy_gem;
170 }
171
172 ret = exynos_drm_fbdev_update(helper, sizes, exynos_gem);
173 if (ret < 0)
174 goto err_destroy_framebuffer;
175
176 mutex_unlock(&dev->struct_mutex);
177 return ret;
178
179err_destroy_framebuffer:
180 drm_framebuffer_cleanup(helper->fb);
181err_destroy_gem:
182 exynos_drm_gem_destroy(exynos_gem);
183
184/*
185 * if failed, all resources allocated above would be released by
186 * drm_mode_config_cleanup() when drm_load() had been called prior
187 * to any specific driver such as fimd or hdmi driver.
188 */
189out:
190 mutex_unlock(&dev->struct_mutex);
191 return ret;
192}
193
194static const struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
195 .fb_probe = exynos_drm_fbdev_create,
196};
197
198static bool exynos_drm_fbdev_is_anything_connected(struct drm_device *dev)
199{
200 struct drm_connector *connector;
201 bool ret = false;
202
203 mutex_lock(&dev->mode_config.mutex);
204 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
205 if (connector->status != connector_status_connected)
206 continue;
207
208 ret = true;
209 break;
210 }
211 mutex_unlock(&dev->mode_config.mutex);
212
213 return ret;
214}
215
216int exynos_drm_fbdev_init(struct drm_device *dev)
217{
218 struct exynos_drm_fbdev *fbdev;
219 struct exynos_drm_private *private = dev->dev_private;
220 struct drm_fb_helper *helper;
221 unsigned int num_crtc;
222 int ret;
223
224 if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector)
225 return 0;
226
227 if (!exynos_drm_fbdev_is_anything_connected(dev))
228 return 0;
229
230 fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
231 if (!fbdev)
232 return -ENOMEM;
233
234 private->fb_helper = helper = &fbdev->drm_fb_helper;
235
236 drm_fb_helper_prepare(dev, helper, &exynos_drm_fb_helper_funcs);
237
238 num_crtc = dev->mode_config.num_crtc;
239
240 ret = drm_fb_helper_init(dev, helper, num_crtc, MAX_CONNECTOR);
241 if (ret < 0) {
242 DRM_ERROR("failed to initialize drm fb helper.\n");
243 goto err_init;
244 }
245
246 ret = drm_fb_helper_single_add_all_connectors(helper);
247 if (ret < 0) {
248 DRM_ERROR("failed to register drm_fb_helper_connector.\n");
249 goto err_setup;
250
251 }
252
253 ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
254 if (ret < 0) {
255 DRM_ERROR("failed to set up hw configuration.\n");
256 goto err_setup;
257 }
258
259 return 0;
260
261err_setup:
262 drm_fb_helper_fini(helper);
263
264err_init:
265 private->fb_helper = NULL;
266 kfree(fbdev);
267
268 return ret;
269}
270
271static void exynos_drm_fbdev_destroy(struct drm_device *dev,
272 struct drm_fb_helper *fb_helper)
273{
274 struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(fb_helper);
275 struct exynos_drm_gem *exynos_gem = exynos_fbd->exynos_gem;
276 struct drm_framebuffer *fb;
277
278 if (exynos_gem->kvaddr)
279 vunmap(exynos_gem->kvaddr);
280
281 /* release drm framebuffer and real buffer */
282 if (fb_helper->fb && fb_helper->fb->funcs) {
283 fb = fb_helper->fb;
284 if (fb) {
285 drm_framebuffer_unregister_private(fb);
286 drm_framebuffer_remove(fb);
287 }
288 }
289
290 drm_fb_helper_unregister_fbi(fb_helper);
291 drm_fb_helper_release_fbi(fb_helper);
292
293 drm_fb_helper_fini(fb_helper);
294}
295
296void exynos_drm_fbdev_fini(struct drm_device *dev)
297{
298 struct exynos_drm_private *private = dev->dev_private;
299 struct exynos_drm_fbdev *fbdev;
300
301 if (!private || !private->fb_helper)
302 return;
303
304 fbdev = to_exynos_fbdev(private->fb_helper);
305
306 exynos_drm_fbdev_destroy(dev, private->fb_helper);
307 kfree(fbdev);
308 private->fb_helper = NULL;
309}
310
311void exynos_drm_fbdev_restore_mode(struct drm_device *dev)
312{
313 struct exynos_drm_private *private = dev->dev_private;
314
315 if (!private || !private->fb_helper)
316 return;
317
318 drm_fb_helper_restore_fbdev_mode_unlocked(private->fb_helper);
319}
320
321void exynos_drm_output_poll_changed(struct drm_device *dev)
322{
323 struct exynos_drm_private *private = dev->dev_private;
324 struct drm_fb_helper *fb_helper = private->fb_helper;
325
326 if (fb_helper)
327 drm_fb_helper_hotplug_event(fb_helper);
328 else
329 exynos_drm_fbdev_init(dev);
330}