summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/bochs/bochs_fbdev.c
blob: 976d9798dc99d4b1eb498b7d8f2634c35c756a34 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include "bochs.h"

/* ---------------------------------------------------------------------- */

static int bochsfb_mmap(struct fb_info *info,
			struct vm_area_struct *vma)
{
	struct drm_fb_helper *fb_helper = info->par;
	struct bochs_device *bochs =
		container_of(fb_helper, struct bochs_device, fb.helper);
	struct bochs_bo *bo = gem_to_bochs_bo(bochs->fb.gfb.obj);

	return ttm_fbdev_mmap(vma, &bo->bo);
}

static struct fb_ops bochsfb_ops = {
	.owner = THIS_MODULE,
	.fb_check_var = drm_fb_helper_check_var,
	.fb_set_par = drm_fb_helper_set_par,
	.fb_fillrect = sys_fillrect,
	.fb_copyarea = sys_copyarea,
	.fb_imageblit = sys_imageblit,
	.fb_pan_display = drm_fb_helper_pan_display,
	.fb_blank = drm_fb_helper_blank,
	.fb_setcmap = drm_fb_helper_setcmap,
	.fb_mmap = bochsfb_mmap,
};

static int bochsfb_create_object(struct bochs_device *bochs,
				 struct drm_mode_fb_cmd2 *mode_cmd,
				 struct drm_gem_object **gobj_p)
{
	struct drm_device *dev = bochs->dev;
	struct drm_gem_object *gobj;
	u32 size;
	int ret = 0;

	size = mode_cmd->pitches[0] * mode_cmd->height;
	ret = bochs_gem_create(dev, size, true, &gobj);
	if (ret)
		return ret;

	*gobj_p = gobj;
	return ret;
}

static int bochsfb_create(struct drm_fb_helper *helper,
			  struct drm_fb_helper_surface_size *sizes)
{
	struct bochs_device *bochs =
		container_of(helper, struct bochs_device, fb.helper);
	struct drm_device *dev = bochs->dev;
	struct fb_info *info;
	struct drm_framebuffer *fb;
	struct drm_mode_fb_cmd2 mode_cmd;
	struct device *device = &dev->pdev->dev;
	struct drm_gem_object *gobj = NULL;
	struct bochs_bo *bo = NULL;
	int size, ret;

	if (sizes->surface_bpp != 32)
		return -EINVAL;

	mode_cmd.width = sizes->surface_width;
	mode_cmd.height = sizes->surface_height;
	mode_cmd.pitches[0] = mode_cmd.width * ((sizes->surface_bpp + 7) / 8);
	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
							  sizes->surface_depth);
	size = mode_cmd.pitches[0] * mode_cmd.height;

	/* alloc, pin & map bo */
	ret = bochsfb_create_object(bochs, &mode_cmd, &gobj);
	if (ret) {
		DRM_ERROR("failed to create fbcon backing object %d\n", ret);
		return ret;
	}

	bo = gem_to_bochs_bo(gobj);

	ret = ttm_bo_reserve(&bo->bo, true, false, false, NULL);
	if (ret)
		return ret;

	ret = bochs_bo_pin(bo, TTM_PL_FLAG_VRAM, NULL);
	if (ret) {
		DRM_ERROR("failed to pin fbcon\n");
		ttm_bo_unreserve(&bo->bo);
		return ret;
	}

	ret = ttm_bo_kmap(&bo->bo, 0, bo->bo.num_pages,
			  &bo->kmap);
	if (ret) {
		DRM_ERROR("failed to kmap fbcon\n");
		ttm_bo_unreserve(&bo->bo);
		return ret;
	}

	ttm_bo_unreserve(&bo->bo);

	/* init fb device */
	info = framebuffer_alloc(0, device);
	if (info == NULL)
		return -ENOMEM;

	info->par = &bochs->fb.helper;

	ret = bochs_framebuffer_init(bochs->dev, &bochs->fb.gfb, &mode_cmd, gobj);
	if (ret)
		return ret;

	bochs->fb.size = size;

	/* setup helper */
	fb = &bochs->fb.gfb.base;
	bochs->fb.helper.fb = fb;
	bochs->fb.helper.fbdev = info;

	strcpy(info->fix.id, "bochsdrmfb");

	info->flags = FBINFO_DEFAULT;
	info->fbops = &bochsfb_ops;

	drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
	drm_fb_helper_fill_var(info, &bochs->fb.helper, sizes->fb_width,
			       sizes->fb_height);

	info->screen_base = bo->kmap.virtual;
	info->screen_size = size;

	drm_vma_offset_remove(&bo->bo.bdev->vma_manager, &bo->bo.vma_node);
	info->fix.smem_start = 0;
	info->fix.smem_len = size;

	ret = fb_alloc_cmap(&info->cmap, 256, 0);
	if (ret) {
		DRM_ERROR("%s: can't allocate color map\n", info->fix.id);
		return -ENOMEM;
	}

	return 0;
}

static int bochs_fbdev_destroy(struct bochs_device *bochs)
{
	struct bochs_framebuffer *gfb = &bochs->fb.gfb;
	struct fb_info *info;

	DRM_DEBUG_DRIVER("\n");

	if (bochs->fb.helper.fbdev) {
		info = bochs->fb.helper.fbdev;

		unregister_framebuffer(info);
		if (info->cmap.len)
			fb_dealloc_cmap(&info->cmap);
		framebuffer_release(info);
	}

	if (gfb->obj) {
		drm_gem_object_unreference_unlocked(gfb->obj);
		gfb->obj = NULL;
	}

	drm_fb_helper_fini(&bochs->fb.helper);
	drm_framebuffer_unregister_private(&gfb->base);
	drm_framebuffer_cleanup(&gfb->base);

	return 0;
}

void bochs_fb_gamma_set(struct drm_crtc *crtc, u16 red, u16 green,
			u16 blue, int regno)
{
}

void bochs_fb_gamma_get(struct drm_crtc *crtc, u16 *red, u16 *green,
			u16 *blue, int regno)
{
	*red   = regno;
	*green = regno;
	*blue  = regno;
}

static const struct drm_fb_helper_funcs bochs_fb_helper_funcs = {
	.gamma_set = bochs_fb_gamma_set,
	.gamma_get = bochs_fb_gamma_get,
	.fb_probe = bochsfb_create,
};

int bochs_fbdev_init(struct bochs_device *bochs)
{
	int ret;

	drm_fb_helper_prepare(bochs->dev, &bochs->fb.helper,
			      &bochs_fb_helper_funcs);

	ret = drm_fb_helper_init(bochs->dev, &bochs->fb.helper,
				 1, 1);
	if (ret)
		return ret;

	ret = drm_fb_helper_single_add_all_connectors(&bochs->fb.helper);
	if (ret)
		goto fini;

	drm_helper_disable_unused_functions(bochs->dev);

	ret = drm_fb_helper_initial_config(&bochs->fb.helper, 32);
	if (ret)
		goto fini;

	bochs->fb.initialized = true;
	return 0;

fini:
	drm_fb_helper_fini(&bochs->fb.helper);
	return ret;
}

void bochs_fbdev_fini(struct bochs_device *bochs)
{
	if (!bochs->fb.initialized)
		return;

	bochs_fbdev_destroy(bochs);
	bochs->fb.initialized = false;
}