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.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(const struct sbus_mmap_map * map,unsigned long physbase,unsigned long fbsize,unsigned long iospace,struct vm_area_struct * vma)41 int sbusfb_mmap_helper(const 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_decrypted(vma->vm_page_prot);
64 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
65
66 /* Each page, see which map applies */
67 for (page = 0; page < size; ){
68 map_size = 0;
69 for (i = 0; map[i].size; i++)
70 if (map[i].voff == off+page) {
71 map_size = sbusfb_mmapsize(map[i].size, fbsize);
72 #ifdef __sparc_v9__
73 #define POFF_MASK (PAGE_MASK|0x1UL)
74 #else
75 #define POFF_MASK (PAGE_MASK)
76 #endif
77 map_offset = (physbase + map[i].poff) & POFF_MASK;
78 break;
79 }
80 if (!map_size) {
81 page += PAGE_SIZE;
82 continue;
83 }
84 if (page + map_size > size)
85 map_size = size - page;
86 r = io_remap_pfn_range(vma,
87 vma->vm_start + page,
88 MK_IOSPACE_PFN(iospace,
89 map_offset >> PAGE_SHIFT),
90 map_size,
91 vma->vm_page_prot);
92 if (r)
93 return -EAGAIN;
94 page += map_size;
95 }
96
97 return 0;
98 }
99 EXPORT_SYMBOL(sbusfb_mmap_helper);
100
sbusfb_ioctl_helper(unsigned long cmd,unsigned long arg,struct fb_info * info,int type,int fb_depth,unsigned long fb_size)101 int sbusfb_ioctl_helper(unsigned long cmd, unsigned long arg,
102 struct fb_info *info,
103 int type, int fb_depth, unsigned long fb_size)
104 {
105 switch(cmd) {
106 case FBIOGTYPE: {
107 struct fbtype __user *f = (struct fbtype __user *) arg;
108
109 if (put_user(type, &f->fb_type) ||
110 put_user(info->var.yres, &f->fb_height) ||
111 put_user(info->var.xres, &f->fb_width) ||
112 put_user(fb_depth, &f->fb_depth) ||
113 put_user(0, &f->fb_cmsize) ||
114 put_user(fb_size, &f->fb_cmsize))
115 return -EFAULT;
116 return 0;
117 }
118 case FBIOPUTCMAP_SPARC: {
119 struct fbcmap __user *c = (struct fbcmap __user *) arg;
120 struct fb_cmap cmap;
121 u16 red, green, blue;
122 u8 red8, green8, blue8;
123 unsigned char __user *ured;
124 unsigned char __user *ugreen;
125 unsigned char __user *ublue;
126 unsigned int index, count, i;
127
128 if (get_user(index, &c->index) ||
129 get_user(count, &c->count) ||
130 get_user(ured, &c->red) ||
131 get_user(ugreen, &c->green) ||
132 get_user(ublue, &c->blue))
133 return -EFAULT;
134
135 cmap.len = 1;
136 cmap.red = &red;
137 cmap.green = &green;
138 cmap.blue = &blue;
139 cmap.transp = NULL;
140 for (i = 0; i < count; i++) {
141 int err;
142
143 if (get_user(red8, &ured[i]) ||
144 get_user(green8, &ugreen[i]) ||
145 get_user(blue8, &ublue[i]))
146 return -EFAULT;
147
148 red = red8 << 8;
149 green = green8 << 8;
150 blue = blue8 << 8;
151
152 cmap.start = index + i;
153 err = fb_set_cmap(&cmap, info);
154 if (err)
155 return err;
156 }
157 return 0;
158 }
159 case FBIOGETCMAP_SPARC: {
160 struct fbcmap __user *c = (struct fbcmap __user *) arg;
161 unsigned char __user *ured;
162 unsigned char __user *ugreen;
163 unsigned char __user *ublue;
164 struct fb_cmap *cmap = &info->cmap;
165 unsigned int index, count, i;
166 u8 red, green, blue;
167
168 if (get_user(index, &c->index) ||
169 get_user(count, &c->count) ||
170 get_user(ured, &c->red) ||
171 get_user(ugreen, &c->green) ||
172 get_user(ublue, &c->blue))
173 return -EFAULT;
174
175 if (index > cmap->len || count > cmap->len - index)
176 return -EINVAL;
177
178 for (i = 0; i < count; i++) {
179 red = cmap->red[index + i] >> 8;
180 green = cmap->green[index + i] >> 8;
181 blue = cmap->blue[index + i] >> 8;
182 if (put_user(red, &ured[i]) ||
183 put_user(green, &ugreen[i]) ||
184 put_user(blue, &ublue[i]))
185 return -EFAULT;
186 }
187 return 0;
188 }
189 default:
190 return -EINVAL;
191 }
192 }
193 EXPORT_SYMBOL(sbusfb_ioctl_helper);
194
195 #ifdef CONFIG_COMPAT
sbusfb_compat_ioctl(struct fb_info * info,unsigned int cmd,unsigned long arg)196 int sbusfb_compat_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg)
197 {
198 switch (cmd) {
199 case FBIOGTYPE:
200 case FBIOSATTR:
201 case FBIOGATTR:
202 case FBIOSVIDEO:
203 case FBIOGVIDEO:
204 case FBIOSCURSOR32:
205 case FBIOGCURSOR32: /* This is not implemented yet.
206 Later it should be converted... */
207 case FBIOSCURPOS:
208 case FBIOGCURPOS:
209 case FBIOGCURMAX:
210 return info->fbops->fb_ioctl(info, cmd, arg);
211 case FBIOPUTCMAP32:
212 case FBIOPUTCMAP_SPARC: {
213 struct fbcmap32 c;
214 struct fb_cmap cmap;
215 u16 red, green, blue;
216 u8 red8, green8, blue8;
217 unsigned char __user *ured;
218 unsigned char __user *ugreen;
219 unsigned char __user *ublue;
220 unsigned int i;
221
222 if (copy_from_user(&c, compat_ptr(arg), sizeof(c)))
223 return -EFAULT;
224 ured = compat_ptr(c.red);
225 ugreen = compat_ptr(c.green);
226 ublue = compat_ptr(c.blue);
227
228 cmap.len = 1;
229 cmap.red = &red;
230 cmap.green = &green;
231 cmap.blue = &blue;
232 cmap.transp = NULL;
233 for (i = 0; i < c.count; i++) {
234 int err;
235
236 if (get_user(red8, &ured[i]) ||
237 get_user(green8, &ugreen[i]) ||
238 get_user(blue8, &ublue[i]))
239 return -EFAULT;
240
241 red = red8 << 8;
242 green = green8 << 8;
243 blue = blue8 << 8;
244
245 cmap.start = c.index + i;
246 err = fb_set_cmap(&cmap, info);
247 if (err)
248 return err;
249 }
250 return 0;
251 }
252 case FBIOGETCMAP32: {
253 struct fbcmap32 c;
254 unsigned char __user *ured;
255 unsigned char __user *ugreen;
256 unsigned char __user *ublue;
257 struct fb_cmap *cmap = &info->cmap;
258 unsigned int index, i;
259 u8 red, green, blue;
260
261 if (copy_from_user(&c, compat_ptr(arg), sizeof(c)))
262 return -EFAULT;
263 index = c.index;
264 ured = compat_ptr(c.red);
265 ugreen = compat_ptr(c.green);
266 ublue = compat_ptr(c.blue);
267
268 if (index > cmap->len || c.count > cmap->len - index)
269 return -EINVAL;
270
271 for (i = 0; i < c.count; i++) {
272 red = cmap->red[index + i] >> 8;
273 green = cmap->green[index + i] >> 8;
274 blue = cmap->blue[index + i] >> 8;
275 if (put_user(red, &ured[i]) ||
276 put_user(green, &ugreen[i]) ||
277 put_user(blue, &ublue[i]))
278 return -EFAULT;
279 }
280 return 0;
281 }
282 default:
283 return -ENOIOCTLCMD;
284 }
285 }
286 EXPORT_SYMBOL(sbusfb_compat_ioctl);
287 #endif
288