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14#include <linux/err.h>
15#include <linux/init.h>
16#include <linux/kernel.h>
17#include <linux/mm.h>
18#include <linux/platform_data/simplefb.h>
19#include <linux/platform_device.h>
20#include <linux/screen_info.h>
21#include <linux/sysfb.h>
22
23static const char simplefb_resname[] = "BOOTFB";
24static const struct simplefb_format formats[] = SIMPLEFB_FORMATS;
25
26
27__init bool sysfb_parse_mode(const struct screen_info *si,
28 struct simplefb_platform_data *mode)
29{
30 const struct simplefb_format *f;
31 __u8 type;
32 unsigned int i;
33
34 type = si->orig_video_isVGA;
35 if (type != VIDEO_TYPE_VLFB && type != VIDEO_TYPE_EFI)
36 return false;
37
38 for (i = 0; i < ARRAY_SIZE(formats); ++i) {
39 f = &formats[i];
40 if (si->lfb_depth == f->bits_per_pixel &&
41 si->red_size == f->red.length &&
42 si->red_pos == f->red.offset &&
43 si->green_size == f->green.length &&
44 si->green_pos == f->green.offset &&
45 si->blue_size == f->blue.length &&
46 si->blue_pos == f->blue.offset &&
47 si->rsvd_size == f->transp.length &&
48 si->rsvd_pos == f->transp.offset) {
49 mode->format = f->name;
50 mode->width = si->lfb_width;
51 mode->height = si->lfb_height;
52 mode->stride = si->lfb_linelength;
53 return true;
54 }
55 }
56
57 return false;
58}
59
60__init int sysfb_create_simplefb(const struct screen_info *si,
61 const struct simplefb_platform_data *mode)
62{
63 struct platform_device *pd;
64 struct resource res;
65 u64 base, size;
66 u32 length;
67 int ret;
68
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73
74 base = si->lfb_base;
75 if (si->capabilities & VIDEO_CAPABILITY_64BIT_BASE)
76 base |= (u64)si->ext_lfb_base << 32;
77 if (!base || (u64)(resource_size_t)base != base) {
78 printk(KERN_DEBUG "sysfb: inaccessible VRAM base\n");
79 return -EINVAL;
80 }
81
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89
90 size = si->lfb_size;
91 if (si->orig_video_isVGA == VIDEO_TYPE_VLFB)
92 size <<= 16;
93 length = mode->height * mode->stride;
94 if (length > size) {
95 printk(KERN_WARNING "sysfb: VRAM smaller than advertised\n");
96 return -EINVAL;
97 }
98 length = PAGE_ALIGN(length);
99
100
101 memset(&res, 0, sizeof(res));
102 res.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
103 res.name = simplefb_resname;
104 res.start = base;
105 res.end = res.start + length - 1;
106 if (res.end <= res.start)
107 return -EINVAL;
108
109 pd = platform_device_alloc("simple-framebuffer", 0);
110 if (!pd)
111 return -ENOMEM;
112
113 sysfb_apply_efi_quirks(pd);
114
115 ret = platform_device_add_resources(pd, &res, 1);
116 if (ret)
117 return ret;
118
119 ret = platform_device_add_data(pd, mode, sizeof(*mode));
120 if (ret)
121 return ret;
122
123 return platform_device_add(pd);
124}
125