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