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path: root/drivers/video/sbuslib.c
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Diffstat (limited to 'drivers/video/sbuslib.c')
-rw-r--r--drivers/video/sbuslib.c184
1 files changed, 184 insertions, 0 deletions
diff --git a/drivers/video/sbuslib.c b/drivers/video/sbuslib.c
new file mode 100644
index 000000000000..34f72edba820
--- /dev/null
+++ b/drivers/video/sbuslib.c
@@ -0,0 +1,184 @@
1/* sbuslib.c: Helper library for SBUS framebuffer drivers.
2 *
3 * Copyright (C) 2003 David S. Miller (davem@redhat.com)
4 */
5
6#include <linux/kernel.h>
7#include <linux/module.h>
8#include <linux/string.h>
9#include <linux/fb.h>
10#include <linux/mm.h>
11
12#include <asm/oplib.h>
13#include <asm/fbio.h>
14
15#include "sbuslib.h"
16
17void sbusfb_fill_var(struct fb_var_screeninfo *var, int prom_node, int bpp)
18{
19 memset(var, 0, sizeof(*var));
20
21 var->xres = prom_getintdefault(prom_node, "width", 1152);
22 var->yres = prom_getintdefault(prom_node, "height", 900);
23 var->xres_virtual = var->xres;
24 var->yres_virtual = var->yres;
25 var->bits_per_pixel = bpp;
26}
27
28EXPORT_SYMBOL(sbusfb_fill_var);
29
30static unsigned long sbusfb_mmapsize(long size, unsigned long fbsize)
31{
32 if (size == SBUS_MMAP_EMPTY) return 0;
33 if (size >= 0) return size;
34 return fbsize * (-size);
35}
36
37int sbusfb_mmap_helper(struct sbus_mmap_map *map,
38 unsigned long physbase,
39 unsigned long fbsize,
40 unsigned long iospace,
41 struct vm_area_struct *vma)
42{
43 unsigned int size, page, r, map_size;
44 unsigned long map_offset = 0;
45 unsigned long off;
46 int i;
47
48 size = vma->vm_end - vma->vm_start;
49 if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
50 return -EINVAL;
51
52 off = vma->vm_pgoff << PAGE_SHIFT;
53
54 /* To stop the swapper from even considering these pages */
55 vma->vm_flags |= (VM_IO | VM_RESERVED);
56
57 /* Each page, see which map applies */
58 for (page = 0; page < size; ){
59 map_size = 0;
60 for (i = 0; map[i].size; i++)
61 if (map[i].voff == off+page) {
62 map_size = sbusfb_mmapsize(map[i].size, fbsize);
63#ifdef __sparc_v9__
64#define POFF_MASK (PAGE_MASK|0x1UL)
65#else
66#define POFF_MASK (PAGE_MASK)
67#endif
68 map_offset = (physbase + map[i].poff) & POFF_MASK;
69 break;
70 }
71 if (!map_size){
72 page += PAGE_SIZE;
73 continue;
74 }
75 if (page + map_size > size)
76 map_size = size - page;
77 r = io_remap_pfn_range(vma,
78 vma->vm_start + page,
79 MK_IOSPACE_PFN(iospace,
80 map_offset >> PAGE_SHIFT),
81 map_size,
82 vma->vm_page_prot);
83 if (r)
84 return -EAGAIN;
85 page += map_size;
86 }
87
88 return 0;
89}
90EXPORT_SYMBOL(sbusfb_mmap_helper);
91
92int sbusfb_ioctl_helper(unsigned long cmd, unsigned long arg,
93 struct fb_info *info,
94 int type, int fb_depth, unsigned long fb_size)
95{
96 switch(cmd) {
97 case FBIOGTYPE: {
98 struct fbtype __user *f = (struct fbtype __user *) arg;
99
100 if (put_user(type, &f->fb_type) ||
101 __put_user(info->var.yres, &f->fb_height) ||
102 __put_user(info->var.xres, &f->fb_width) ||
103 __put_user(fb_depth, &f->fb_depth) ||
104 __put_user(0, &f->fb_cmsize) ||
105 __put_user(fb_size, &f->fb_cmsize))
106 return -EFAULT;
107 return 0;
108 }
109 case FBIOPUTCMAP_SPARC: {
110 struct fbcmap __user *c = (struct fbcmap __user *) arg;
111 struct fb_cmap cmap;
112 u16 red, green, blue;
113 u8 red8, green8, blue8;
114 unsigned char __user *ured;
115 unsigned char __user *ugreen;
116 unsigned char __user *ublue;
117 int index, count, i;
118
119 if (get_user(index, &c->index) ||
120 __get_user(count, &c->count) ||
121 __get_user(ured, &c->red) ||
122 __get_user(ugreen, &c->green) ||
123 __get_user(ublue, &c->blue))
124 return -EFAULT;
125
126 cmap.len = 1;
127 cmap.red = &red;
128 cmap.green = &green;
129 cmap.blue = &blue;
130 cmap.transp = NULL;
131 for (i = 0; i < count; i++) {
132 int err;
133
134 if (get_user(red8, &ured[i]) ||
135 get_user(green8, &ugreen[i]) ||
136 get_user(blue8, &ublue[i]))
137 return -EFAULT;
138
139 red = red8 << 8;
140 green = green8 << 8;
141 blue = blue8 << 8;
142
143 cmap.start = index + i;
144 err = fb_set_cmap(&cmap, info);
145 if (err)
146 return err;
147 }
148 return 0;
149 }
150 case FBIOGETCMAP_SPARC: {
151 struct fbcmap __user *c = (struct fbcmap __user *) arg;
152 unsigned char __user *ured;
153 unsigned char __user *ugreen;
154 unsigned char __user *ublue;
155 struct fb_cmap *cmap = &info->cmap;
156 int index, count, i;
157 u8 red, green, blue;
158
159 if (get_user(index, &c->index) ||
160 __get_user(count, &c->count) ||
161 __get_user(ured, &c->red) ||
162 __get_user(ugreen, &c->green) ||
163 __get_user(ublue, &c->blue))
164 return -EFAULT;
165
166 if (index + count > cmap->len)
167 return -EINVAL;
168
169 for (i = 0; i < count; i++) {
170 red = cmap->red[index + i] >> 8;
171 green = cmap->green[index + i] >> 8;
172 blue = cmap->blue[index + i] >> 8;
173 if (put_user(red, &ured[i]) ||
174 put_user(green, &ugreen[i]) ||
175 put_user(blue, &ublue[i]))
176 return -EFAULT;
177 }
178 return 0;
179 }
180 default:
181 return -EINVAL;
182 };
183}
184EXPORT_SYMBOL(sbusfb_ioctl_helper);
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-25 05:05:19 -0500