drivers/video/sbuslib.c

   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/compat.h>
   7 #include <linux/kernel.h>
   8 #include <linux/module.h>
   9 #include <linux/string.h>
  10 #include <linux/fb.h>
  11 #include <linux/mm.h>
  12 #include <linux/uaccess.h>
  13 #include <linux/of_device.h>
  14
  15 #include <asm/fbio.h>
  16
  17 #include "sbuslib.h"
  18
  19 void sbusfb_fill_var(struct fb_var_screeninfo *var, struct device_node *dp,
  20                      int bpp)
  21 {
  22         memset(var, 0, sizeof(*var));
  23
  24         var->xres = of_getintprop_default(dp, "width", 1152);
  25         var->yres = of_getintprop_default(dp, "height", 900);
  26         var->xres_virtual = var->xres;
  27         var->yres_virtual = var->yres;
  28         var->bits_per_pixel = bpp;
  29 }
  30
  31 EXPORT_SYMBOL(sbusfb_fill_var);
  32
  33 static unsigned long sbusfb_mmapsize(long size, unsigned long fbsize)
  34 {
  35         if (size == SBUS_MMAP_EMPTY) return 0;
  36         if (size >= 0) return size;
  37         return fbsize * (-size);
  38 }
  39
  40 int sbusfb_mmap_helper(struct sbus_mmap_map *map,
  41                        unsigned long physbase,
  42                        unsigned long fbsize,
  43                        unsigned long iospace,
  44                        struct vm_area_struct *vma)
  45 {
  46         unsigned int size, page, r, map_size;
  47         unsigned long map_offset = 0;
  48         unsigned long off;
  49         int i;
  50
  51         if (!(vma->vm_flags & (VM_SHARED | VM_MAYSHARE)))
  52                 return -EINVAL;
  53
  54         size = vma->vm_end - vma->vm_start;
  55         if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
  56                 return -EINVAL;
  57
  58         off = vma->vm_pgoff << PAGE_SHIFT;
  59
  60         /* VM_IO | VM_DONTEXPAND | VM_DONTDUMP are set by remap_pfn_range() */
  61
  62         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
  63
  64         /* Each page, see which map applies */
  65         for (page = 0; page < size; ){
  66                 map_size = 0;
  67                 for (i = 0; map[i].size; i++)
  68                         if (map[i].voff == off+page) {
  69                                 map_size = sbusfb_mmapsize(map[i].size, fbsize);
  70 #ifdef __sparc_v9__
  71 #define POFF_MASK       (PAGE_MASK|0x1UL)
  72 #else
  73 #define POFF_MASK       (PAGE_MASK)
  74 #endif
  75                                 map_offset = (physbase + map[i].poff) & POFF_MASK;
  76                                 break;
  77                         }
  78                 if (!map_size) {
  79                         page += PAGE_SIZE;
  80                         continue;
  81                 }
  82                 if (page + map_size > size)
  83                         map_size = size - page;
  84                 r = io_remap_pfn_range(vma,
  85                                         vma->vm_start + page,
  86                                         MK_IOSPACE_PFN(iospace,
  87                                                 map_offset >> PAGE_SHIFT),
  88                                         map_size,
  89                                         vma->vm_page_prot);
  90                 if (r)
  91                         return -EAGAIN;
  92                 page += map_size;
  93         }
  94
  95         return 0;
  96 }
  97 EXPORT_SYMBOL(sbusfb_mmap_helper);
  98
  99 int sbusfb_ioctl_helper(unsigned long cmd, unsigned long arg,
 100                         struct fb_info *info,
 101                         int type, int fb_depth, unsigned long fb_size)
 102 {
 103         switch(cmd) {
 104         case FBIOGTYPE: {
 105                 struct fbtype __user *f = (struct fbtype __user *) arg;
 106
 107                 if (put_user(type, &f->fb_type) ||
 108                     __put_user(info->var.yres, &f->fb_height) ||
 109                     __put_user(info->var.xres, &f->fb_width) ||
 110                     __put_user(fb_depth, &f->fb_depth) ||
 111                     __put_user(0, &f->fb_cmsize) ||
 112                     __put_user(fb_size, &f->fb_cmsize))
 113                         return -EFAULT;
 114                 return 0;
 115         }
 116         case FBIOPUTCMAP_SPARC: {
 117                 struct fbcmap __user *c = (struct fbcmap __user *) arg;
 118                 struct fb_cmap cmap;
 119                 u16 red, green, blue;
 120                 u8 red8, green8, blue8;
 121                 unsigned char __user *ured;
 122                 unsigned char __user *ugreen;
 123                 unsigned char __user *ublue;
 124                 int index, count, i;
 125
 126                 if (get_user(index, &c->index) ||
 127                     __get_user(count, &c->count) ||
 128                     __get_user(ured, &c->red) ||
 129                     __get_user(ugreen, &c->green) ||
 130                     __get_user(ublue, &c->blue))
 131                         return -EFAULT;
 132
 133                 cmap.len = 1;
 134                 cmap.red = &red;
 135                 cmap.green = &green;
 136                 cmap.blue = &blue;
 137                 cmap.transp = NULL;
 138                 for (i = 0; i < count; i++) {
 139                         int err;
 140
 141                         if (get_user(red8, &ured[i]) ||
 142                             get_user(green8, &ugreen[i]) ||
 143                             get_user(blue8, &ublue[i]))
 144                                 return -EFAULT;
 145
 146                         red = red8 << 8;
 147                         green = green8 << 8;
 148                         blue = blue8 << 8;
 149
 150                         cmap.start = index + i;
 151                         err = fb_set_cmap(&cmap, info);
 152                         if (err)
 153                                 return err;
 154                 }
 155                 return 0;
 156         }
 157         case FBIOGETCMAP_SPARC: {
 158                 struct fbcmap __user *c = (struct fbcmap __user *) arg;
 159                 unsigned char __user *ured;
 160                 unsigned char __user *ugreen;
 161                 unsigned char __user *ublue;
 162                 struct fb_cmap *cmap = &info->cmap;
 163                 int index, count, i;
 164                 u8 red, green, blue;
 165
 166                 if (get_user(index, &c->index) ||
 167                     __get_user(count, &c->count) ||
 168                     __get_user(ured, &c->red) ||
 169                     __get_user(ugreen, &c->green) ||
 170                     __get_user(ublue, &c->blue))
 171                         return -EFAULT;
 172
 173                 if (index + count > cmap->len)
 174                         return -EINVAL;
 175
 176                 for (i = 0; i < count; i++) {
 177                         red = cmap->red[index + i] >> 8;
 178                         green = cmap->green[index + i] >> 8;
 179                         blue = cmap->blue[index + i] >> 8;
 180                         if (put_user(red, &ured[i]) ||
 181                             put_user(green, &ugreen[i]) ||
 182                             put_user(blue, &ublue[i]))
 183                                 return -EFAULT;
 184                 }
 185                 return 0;
 186         }
 187         default:
 188                 return -EINVAL;
 189         };
 190 }
 191 EXPORT_SYMBOL(sbusfb_ioctl_helper);
 192
 193 #ifdef CONFIG_COMPAT
 194 static int fbiogetputcmap(struct fb_info *info, unsigned int cmd, unsigned long arg)
 195 {
 196         struct fbcmap32 __user *argp = (void __user *)arg;
 197         struct fbcmap __user *p = compat_alloc_user_space(sizeof(*p));
 198         u32 addr;
 199         int ret;
 200
 201         ret = copy_in_user(p, argp, 2 * sizeof(int));
 202         ret |= get_user(addr, &argp->red);
 203         ret |= put_user(compat_ptr(addr), &p->red);
 204         ret |= get_user(addr, &argp->green);
 205         ret |= put_user(compat_ptr(addr), &p->green);
 206         ret |= get_user(addr, &argp->blue);
 207         ret |= put_user(compat_ptr(addr), &p->blue);
 208         if (ret)
 209                 return -EFAULT;
 210         return info->fbops->fb_ioctl(info,
 211                         (cmd == FBIOPUTCMAP32) ?
 212                         FBIOPUTCMAP_SPARC : FBIOGETCMAP_SPARC,
 213                         (unsigned long)p);
 214 }
 215
 216 static int fbiogscursor(struct fb_info *info, unsigned long arg)
 217 {
 218         struct fbcursor __user *p = compat_alloc_user_space(sizeof(*p));
 219         struct fbcursor32 __user *argp =  (void __user *)arg;
 220         compat_uptr_t addr;
 221         int ret;
 222
 223         ret = copy_in_user(p, argp,
 224                               2 * sizeof (short) + 2 * sizeof(struct fbcurpos));
 225         ret |= copy_in_user(&p->size, &argp->size, sizeof(struct fbcurpos));
 226         ret |= copy_in_user(&p->cmap, &argp->cmap, 2 * sizeof(int));
 227         ret |= get_user(addr, &argp->cmap.red);
 228         ret |= put_user(compat_ptr(addr), &p->cmap.red);
 229         ret |= get_user(addr, &argp->cmap.green);
 230         ret |= put_user(compat_ptr(addr), &p->cmap.green);
 231         ret |= get_user(addr, &argp->cmap.blue);
 232         ret |= put_user(compat_ptr(addr), &p->cmap.blue);
 233         ret |= get_user(addr, &argp->mask);
 234         ret |= put_user(compat_ptr(addr), &p->mask);
 235         ret |= get_user(addr, &argp->image);
 236         ret |= put_user(compat_ptr(addr), &p->image);
 237         if (ret)
 238                 return -EFAULT;
 239         return info->fbops->fb_ioctl(info, FBIOSCURSOR, (unsigned long)p);
 240 }
 241
 242 int sbusfb_compat_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg)
 243 {
 244         switch (cmd) {
 245         case FBIOGTYPE:
 246         case FBIOSATTR:
 247         case FBIOGATTR:
 248         case FBIOSVIDEO:
 249         case FBIOGVIDEO:
 250         case FBIOGCURSOR32:     /* This is not implemented yet.
 251                                    Later it should be converted... */
 252         case FBIOSCURPOS:
 253         case FBIOGCURPOS:
 254         case FBIOGCURMAX:
 255                 return info->fbops->fb_ioctl(info, cmd, arg);
 256         case FBIOPUTCMAP32:
 257                 return fbiogetputcmap(info, cmd, arg);
 258         case FBIOGETCMAP32:
 259                 return fbiogetputcmap(info, cmd, arg);
 260         case FBIOSCURSOR32:
 261                 return fbiogscursor(info, arg);
 262         default:
 263                 return -ENOIOCTLCMD;
 264         }
 265 }
 266 EXPORT_SYMBOL(sbusfb_compat_ioctl);
 267 #endif