drivers/video/fbdev/sbuslib.c

   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
  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
  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
  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
 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
 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