Commit | Line | Data |
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e3263ab3 DH |
1 | /* |
2 | * Generic System Framebuffers on x86 | |
3 | * Copyright (c) 2012-2013 David Herrmann <dh.herrmann@gmail.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms of the GNU General Public License as published by the Free | |
7 | * Software Foundation; either version 2 of the License, or (at your option) | |
8 | * any later version. | |
9 | */ | |
10 | ||
11 | /* | |
12 | * simple-framebuffer probing | |
13 | * Try to convert "screen_info" into a "simple-framebuffer" compatible mode. | |
14 | * If the mode is incompatible, we return "false" and let the caller create | |
15 | * legacy nodes instead. | |
16 | */ | |
17 | ||
18 | #include <linux/err.h> | |
19 | #include <linux/init.h> | |
20 | #include <linux/kernel.h> | |
21 | #include <linux/mm.h> | |
22 | #include <linux/platform_data/simplefb.h> | |
23 | #include <linux/platform_device.h> | |
24 | #include <linux/screen_info.h> | |
25 | #include <asm/sysfb.h> | |
26 | ||
27 | static const char simplefb_resname[] = "BOOTFB"; | |
28 | static const struct simplefb_format formats[] = SIMPLEFB_FORMATS; | |
29 | ||
30 | /* try parsing x86 screen_info into a simple-framebuffer mode struct */ | |
31 | __init bool parse_mode(const struct screen_info *si, | |
32 | struct simplefb_platform_data *mode) | |
33 | { | |
34 | const struct simplefb_format *f; | |
35 | __u8 type; | |
36 | unsigned int i; | |
37 | ||
38 | type = si->orig_video_isVGA; | |
39 | if (type != VIDEO_TYPE_VLFB && type != VIDEO_TYPE_EFI) | |
40 | return false; | |
41 | ||
42 | for (i = 0; i < ARRAY_SIZE(formats); ++i) { | |
43 | f = &formats[i]; | |
44 | if (si->lfb_depth == f->bits_per_pixel && | |
45 | si->red_size == f->red.length && | |
46 | si->red_pos == f->red.offset && | |
47 | si->green_size == f->green.length && | |
48 | si->green_pos == f->green.offset && | |
49 | si->blue_size == f->blue.length && | |
50 | si->blue_pos == f->blue.offset && | |
51 | si->rsvd_size == f->transp.length && | |
52 | si->rsvd_pos == f->transp.offset) { | |
53 | mode->format = f->name; | |
54 | mode->width = si->lfb_width; | |
55 | mode->height = si->lfb_height; | |
56 | mode->stride = si->lfb_linelength; | |
57 | return true; | |
58 | } | |
59 | } | |
60 | ||
61 | return false; | |
62 | } | |
63 | ||
64 | __init int create_simplefb(const struct screen_info *si, | |
65 | const struct simplefb_platform_data *mode) | |
66 | { | |
67 | struct platform_device *pd; | |
68 | struct resource res; | |
69 | unsigned long len; | |
70 | ||
71 | /* don't use lfb_size as it may contain the whole VMEM instead of only | |
72 | * the part that is occupied by the framebuffer */ | |
73 | len = mode->height * mode->stride; | |
74 | len = PAGE_ALIGN(len); | |
e33a29a5 | 75 | if (len > (u64)si->lfb_size << 16) { |
e3263ab3 DH |
76 | printk(KERN_WARNING "sysfb: VRAM smaller than advertised\n"); |
77 | return -EINVAL; | |
78 | } | |
79 | ||
80 | /* setup IORESOURCE_MEM as framebuffer memory */ | |
81 | memset(&res, 0, sizeof(res)); | |
29d274b8 | 82 | res.flags = IORESOURCE_MEM | IORESOURCE_BUSY; |
e3263ab3 DH |
83 | res.name = simplefb_resname; |
84 | res.start = si->lfb_base; | |
85 | res.end = si->lfb_base + len - 1; | |
86 | if (res.end <= res.start) | |
87 | return -EINVAL; | |
88 | ||
89 | pd = platform_device_register_resndata(NULL, "simple-framebuffer", 0, | |
90 | &res, 1, mode, sizeof(*mode)); | |
76ef0db7 | 91 | return PTR_ERR_OR_ZERO(pd); |
e3263ab3 | 92 | } |