1 // SPDX-License-Identifier: GPL-2.0
2 /* sbuslib.c: Helper library for SBUS framebuffer drivers.
3 *
4 * Copyright (C) 2003 David S. Miller (davem@redhat.com)
5 */
6
7 #include <linux/compat.h>
8 #include <linux/kernel.h>
9 #include <linux/module.h>
10 #include <linux/string.h>
11 #include <linux/fb.h>
12 #include <linux/mm.h>
13 #include <linux/uaccess.h>
14 #include <linux/of_device.h>
15
16 #include <asm/fbio.h>
17
18 #include "sbuslib.h"
19
sbusfb_fill_var(struct fb_var_screeninfo * var,struct device_node * dp,int bpp)20 void sbusfb_fill_var(struct fb_var_screeninfo *var, struct device_node *dp,
21 int bpp)
22 {
23 memset(var, 0, sizeof(*var));
24
25 var->xres = of_getintprop_default(dp, "width", 1152);
26 var->yres = of_getintprop_default(dp, "height", 900);
27 var->xres_virtual = var->xres;
28 var->yres_virtual = var->yres;
29 var->bits_per_pixel = bpp;
30 }
31
32 EXPORT_SYMBOL(sbusfb_fill_var);
33
sbusfb_mmapsize(long size,unsigned long fbsize)34 static unsigned long sbusfb_mmapsize(long size, unsigned long fbsize)
35 {
36 if (size == SBUS_MMAP_EMPTY) return 0;
37 if (size >= 0) return size;
38 return fbsize * (-size);
39 }
40
sbusfb_mmap_helper(struct sbus_mmap_map * map,unsigned long physbase,unsigned long fbsize,unsigned long iospace,struct vm_area_struct * vma)41 int sbusfb_mmap_helper(struct sbus_mmap_map *map,
42 unsigned long physbase,
43 unsigned long fbsize,
44 unsigned long iospace,
45 struct vm_area_struct *vma)
46 {
47 unsigned int size, page, r, map_size;
48 unsigned long map_offset = 0;
49 unsigned long off;
50 int i;
51
52 if (!(vma->vm_flags & (VM_SHARED | VM_MAYSHARE)))
53 return -EINVAL;
54
55 size = vma->vm_end - vma->vm_start;
56 if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
57 return -EINVAL;
58
59 off = vma->vm_pgoff << PAGE_SHIFT;
60
61 /* VM_IO | VM_DONTEXPAND | VM_DONTDUMP are set by remap_pfn_range() */
62
63 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
64
65 /* Each page, see which map applies */
66 for (page = 0; page < size; ){
67 map_size = 0;
68 for (i = 0; map[i].size; i++)
69 if (map[i].voff == off+page) {
70 map_size = sbusfb_mmapsize(map[i].size, fbsize);
71 #ifdef __sparc_v9__
72 #define POFF_MASK (PAGE_MASK|0x1UL)
73 #else
74 #define POFF_MASK (PAGE_MASK)
75 #endif
76 map_offset = (physbase + map[i].poff) & POFF_MASK;
77 break;
78 }
79 if (!map_size) {
80 page += PAGE_SIZE;
81 continue;
82 }
83 if (page + map_size > size)
84 map_size = size - page;
85 r = io_remap_pfn_range(vma,
86 vma->vm_start + page,
87 MK_IOSPACE_PFN(iospace,
88 map_offset >> PAGE_SHIFT),
89 map_size,
90 vma->vm_page_prot);
91 if (r)
92 return -EAGAIN;
93 page += map_size;
94 }
95
96 return 0;
97 }
98 EXPORT_SYMBOL(sbusfb_mmap_helper);
99
sbusfb_ioctl_helper(unsigned long cmd,unsigned long arg,struct fb_info * info,int type,int fb_depth,unsigned long fb_size)100 int sbusfb_ioctl_helper(unsigned long cmd, unsigned long arg,
101 struct fb_info *info,
102 int type, int fb_depth, unsigned long fb_size)
103 {
104 switch(cmd) {
105 case FBIOGTYPE: {
106 struct fbtype __user *f = (struct fbtype __user *) arg;
107
108 if (put_user(type, &f->fb_type) ||
109 put_user(info->var.yres, &f->fb_height) ||
110 put_user(info->var.xres, &f->fb_width) ||
111 put_user(fb_depth, &f->fb_depth) ||
112 put_user(0, &f->fb_cmsize) ||
113 put_user(fb_size, &f->fb_cmsize))
114 return -EFAULT;
115 return 0;
116 }
117 case FBIOPUTCMAP_SPARC: {
118 struct fbcmap __user *c = (struct fbcmap __user *) arg;
119 struct fb_cmap cmap;
120 u16 red, green, blue;
121 u8 red8, green8, blue8;
122 unsigned char __user *ured;
123 unsigned char __user *ugreen;
124 unsigned char __user *ublue;
125 unsigned int index, count, i;
126
127 if (get_user(index, &c->index) ||
128 get_user(count, &c->count) ||
129 get_user(ured, &c->red) ||
130 get_user(ugreen, &c->green) ||
131 get_user(ublue, &c->blue))
132 return -EFAULT;
133
134 cmap.len = 1;
135 cmap.red = &red;
136 cmap.green = &green;
137 cmap.blue = &blue;
138 cmap.transp = NULL;
139 for (i = 0; i < count; i++) {
140 int err;
141
142 if (get_user(red8, &ured[i]) ||
143 get_user(green8, &ugreen[i]) ||
144 get_user(blue8, &ublue[i]))
145 return -EFAULT;
146
147 red = red8 << 8;
148 green = green8 << 8;
149 blue = blue8 << 8;
150
151 cmap.start = index + i;
152 err = fb_set_cmap(&cmap, info);
153 if (err)
154 return err;
155 }
156 return 0;
157 }
158 case FBIOGETCMAP_SPARC: {
159 struct fbcmap __user *c = (struct fbcmap __user *) arg;
160 unsigned char __user *ured;
161 unsigned char __user *ugreen;
162 unsigned char __user *ublue;
163 struct fb_cmap *cmap = &info->cmap;
164 unsigned int index, count, i;
165 u8 red, green, blue;
166
167 if (get_user(index, &c->index) ||
168 get_user(count, &c->count) ||
169 get_user(ured, &c->red) ||
170 get_user(ugreen, &c->green) ||
171 get_user(ublue, &c->blue))
172 return -EFAULT;
173
174 if (index > cmap->len || count > cmap->len - index)
175 return -EINVAL;
176
177 for (i = 0; i < count; i++) {
178 red = cmap->red[index + i] >> 8;
179 green = cmap->green[index + i] >> 8;
180 blue = cmap->blue[index + i] >> 8;
181 if (put_user(red, &ured[i]) ||
182 put_user(green, &ugreen[i]) ||
183 put_user(blue, &ublue[i]))
184 return -EFAULT;
185 }
186 return 0;
187 }
188 default:
189 return -EINVAL;
190 }
191 }
192 EXPORT_SYMBOL(sbusfb_ioctl_helper);
193
194 #ifdef CONFIG_COMPAT
sbusfb_compat_ioctl(struct fb_info * info,unsigned int cmd,unsigned long arg)195 int sbusfb_compat_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg)
196 {
197 switch (cmd) {
198 case FBIOGTYPE:
199 case FBIOSATTR:
200 case FBIOGATTR:
201 case FBIOSVIDEO:
202 case FBIOGVIDEO:
203 case FBIOSCURSOR32:
204 case FBIOGCURSOR32: /* This is not implemented yet.
205 Later it should be converted... */
206 case FBIOSCURPOS:
207 case FBIOGCURPOS:
208 case FBIOGCURMAX:
209 return info->fbops->fb_ioctl(info, cmd, arg);
210 case FBIOPUTCMAP32:
211 case FBIOPUTCMAP_SPARC: {
212 struct fbcmap32 c;
213 struct fb_cmap cmap;
214 u16 red, green, blue;
215 u8 red8, green8, blue8;
216 unsigned char __user *ured;
217 unsigned char __user *ugreen;
218 unsigned char __user *ublue;
219 unsigned int i;
220
221 if (copy_from_user(&c, compat_ptr(arg), sizeof(c)))
222 return -EFAULT;
223 ured = compat_ptr(c.red);
224 ugreen = compat_ptr(c.green);
225 ublue = compat_ptr(c.blue);
226
227 cmap.len = 1;
228 cmap.red = &red;
229 cmap.green = &green;
230 cmap.blue = &blue;
231 cmap.transp = NULL;
232 for (i = 0; i < c.count; i++) {
233 int err;
234
235 if (get_user(red8, &ured[i]) ||
236 get_user(green8, &ugreen[i]) ||
237 get_user(blue8, &ublue[i]))
238 return -EFAULT;
239
240 red = red8 << 8;
241 green = green8 << 8;
242 blue = blue8 << 8;
243
244 cmap.start = c.index + i;
245 err = fb_set_cmap(&cmap, info);
246 if (err)
247 return err;
248 }
249 return 0;
250 }
251 case FBIOGETCMAP32: {
252 struct fbcmap32 c;
253 unsigned char __user *ured;
254 unsigned char __user *ugreen;
255 unsigned char __user *ublue;
256 struct fb_cmap *cmap = &info->cmap;
257 unsigned int index, i;
258 u8 red, green, blue;
259
260 if (copy_from_user(&c, compat_ptr(arg), sizeof(c)))
261 return -EFAULT;
262 index = c.index;
263 ured = compat_ptr(c.red);
264 ugreen = compat_ptr(c.green);
265 ublue = compat_ptr(c.blue);
266
267 if (index > cmap->len || c.count > cmap->len - index)
268 return -EINVAL;
269
270 for (i = 0; i < c.count; i++) {
271 red = cmap->red[index + i] >> 8;
272 green = cmap->green[index + i] >> 8;
273 blue = cmap->blue[index + i] >> 8;
274 if (put_user(red, &ured[i]) ||
275 put_user(green, &ugreen[i]) ||
276 put_user(blue, &ublue[i]))
277 return -EFAULT;
278 }
279 return 0;
280 }
281 default:
282 return -ENOIOCTLCMD;
283 }
284 }
285 EXPORT_SYMBOL(sbusfb_compat_ioctl);
286 #endif
287