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         /* Each page, see which map applies */
  62         for (page = 0; page < size; ){
  63                 map_size = 0;
  64                 for (i = 0; map[i].size; i++)
  65                         if (map[i].voff == off+page) {
  66                                 map_size = sbusfb_mmapsize(map[i].size, fbsize);
  67 #ifdef __sparc_v9__
  68 #define POFF_MASK       (PAGE_MASK|0x1UL)
  69 #else
  70 #define POFF_MASK       (PAGE_MASK)
  71 #endif
  72                                 map_offset = (physbase + map[i].poff) & POFF_MASK;
  73                                 break;
  74                         }
  75                 if (!map_size){
  76                         page += PAGE_SIZE;
  77                         continue;
  78                 }
  79                 if (page + map_size > size)
  80                         map_size = size - page;
  81                 r = io_remap_pfn_range(vma,
  82                                         vma->vm_start + page,
  83                                         MK_IOSPACE_PFN(iospace,
  84                                                 map_offset >> PAGE_SHIFT),
  85                                         map_size,
  86                                         vma->vm_page_prot);
  87                 if (r)
  88                         return -EAGAIN;
  89                 page += map_size;
  90         }
  91
  92         return 0;
  93 }
  94 EXPORT_SYMBOL(sbusfb_mmap_helper);
  95
  96 int sbusfb_ioctl_helper(unsigned long cmd, unsigned long arg,
  97                         struct fb_info *info,
  98                         int type, int fb_depth, unsigned long fb_size)
  99 {
 100         switch(cmd) {
 101         case FBIOGTYPE: {
 102                 struct fbtype __user *f = (struct fbtype __user *) arg;
 103
 104                 if (put_user(type, &f->fb_type) ||
 105                     __put_user(info->var.yres, &f->fb_height) ||
 106                     __put_user(info->var.xres, &f->fb_width) ||
 107                     __put_user(fb_depth, &f->fb_depth) ||
 108                     __put_user(0, &f->fb_cmsize) ||
 109                     __put_user(fb_size, &f->fb_cmsize))
 110                         return -EFAULT;
 111                 return 0;
 112         }
 113         case FBIOPUTCMAP_SPARC: {
 114                 struct fbcmap __user *c = (struct fbcmap __user *) arg;
 115                 struct fb_cmap cmap;
 116                 u16 red, green, blue;
 117                 u8 red8, green8, blue8;
 118                 unsigned char __user *ured;
 119                 unsigned char __user *ugreen;
 120                 unsigned char __user *ublue;
 121                 int index, count, i;
 122
 123                 if (get_user(index, &c->index) ||
 124                     __get_user(count, &c->count) ||
 125                     __get_user(ured, &c->red) ||
 126                     __get_user(ugreen, &c->green) ||
 127                     __get_user(ublue, &c->blue))
 128                         return -EFAULT;
 129
 130                 cmap.len = 1;
 131                 cmap.red = &red;
 132                 cmap.green = &green;
 133                 cmap.blue = &blue;
 134                 cmap.transp = NULL;
 135                 for (i = 0; i < count; i++) {
 136                         int err;
 137
 138                         if (get_user(red8, &ured[i]) ||
 139                             get_user(green8, &ugreen[i]) ||
 140                             get_user(blue8, &ublue[i]))
 141                                 return -EFAULT;
 142
 143                         red = red8 << 8;
 144                         green = green8 << 8;
 145                         blue = blue8 << 8;
 146
 147                         cmap.start = index + i;
 148                         err = fb_set_cmap(&cmap, info);
 149                         if (err)
 150                                 return err;
 151                 }
 152                 return 0;
 153         }
 154         case FBIOGETCMAP_SPARC: {
 155                 struct fbcmap __user *c = (struct fbcmap __user *) arg;
 156                 unsigned char __user *ured;
 157                 unsigned char __user *ugreen;
 158                 unsigned char __user *ublue;
 159                 struct fb_cmap *cmap = &info->cmap;
 160                 int index, count, i;
 161                 u8 red, green, blue;
 162
 163                 if (get_user(index, &c->index) ||
 164                     __get_user(count, &c->count) ||
 165                     __get_user(ured, &c->red) ||
 166                     __get_user(ugreen, &c->green) ||
 167                     __get_user(ublue, &c->blue))
 168                         return -EFAULT;
 169
 170                 if (index + count > cmap->len)
 171                         return -EINVAL;
 172
 173                 for (i = 0; i < count; i++) {
 174                         red = cmap->red[index + i] >> 8;
 175                         green = cmap->green[index + i] >> 8;
 176                         blue = cmap->blue[index + i] >> 8;
 177                         if (put_user(red, &ured[i]) ||
 178                             put_user(green, &ugreen[i]) ||
 179                             put_user(blue, &ublue[i]))
 180                                 return -EFAULT;
 181                 }
 182                 return 0;
 183         }
 184         default:
 185                 return -EINVAL;
 186         };
 187 }
 188 EXPORT_SYMBOL(sbusfb_ioctl_helper);
 189
 190 #ifdef CONFIG_COMPAT
 191 struct  fbcmap32 {
 192         int             index;          /* first element (0 origin) */
 193         int             count;
 194         u32             red;
 195         u32             green;
 196         u32             blue;
 197 };
 198
 199 #define FBIOPUTCMAP32   _IOW('F', 3, struct fbcmap32)
 200 #define FBIOGETCMAP32   _IOW('F', 4, struct fbcmap32)
 201
 202 static int fbiogetputcmap(struct fb_info *info, unsigned int cmd, unsigned long arg)
 203 {
 204         struct fbcmap32 __user *argp = (void __user *)arg;
 205         struct fbcmap __user *p = compat_alloc_user_space(sizeof(*p));
 206         u32 addr;
 207         int ret;
 208
 209         ret = copy_in_user(p, argp, 2 * sizeof(int));
 210         ret |= get_user(addr, &argp->red);
 211         ret |= put_user(compat_ptr(addr), &p->red);
 212         ret |= get_user(addr, &argp->green);
 213         ret |= put_user(compat_ptr(addr), &p->green);
 214         ret |= get_user(addr, &argp->blue);
 215         ret |= put_user(compat_ptr(addr), &p->blue);
 216         if (ret)
 217                 return -EFAULT;
 218         return info->fbops->fb_ioctl(info,
 219                         (cmd == FBIOPUTCMAP32) ?
 220                         FBIOPUTCMAP_SPARC : FBIOGETCMAP_SPARC,
 221                         (unsigned long)p);
 222 }
 223
 224 struct fbcursor32 {
 225         short set;              /* what to set, choose from the list above */
 226         short enable;           /* cursor on/off */
 227         struct fbcurpos pos;    /* cursor position */
 228         struct fbcurpos hot;    /* cursor hot spot */
 229         struct fbcmap32 cmap;   /* color map info */
 230         struct fbcurpos size;   /* cursor bit map size */
 231         u32     image;          /* cursor image bits */
 232         u32     mask;           /* cursor mask bits */
 233 };
 234
 235 #define FBIOSCURSOR32   _IOW('F', 24, struct fbcursor32)
 236 #define FBIOGCURSOR32   _IOW('F', 25, struct fbcursor32)
 237
 238 static int fbiogscursor(struct fb_info *info, unsigned long arg)
 239 {
 240         struct fbcursor __user *p = compat_alloc_user_space(sizeof(*p));
 241         struct fbcursor32 __user *argp =  (void __user *)arg;
 242         compat_uptr_t addr;
 243         int ret;
 244
 245         ret = copy_in_user(p, argp,
 246                               2 * sizeof (short) + 2 * sizeof(struct fbcurpos));
 247         ret |= copy_in_user(&p->size, &argp->size, sizeof(struct fbcurpos));
 248         ret |= copy_in_user(&p->cmap, &argp->cmap, 2 * sizeof(int));
 249         ret |= get_user(addr, &argp->cmap.red);
 250         ret |= put_user(compat_ptr(addr), &p->cmap.red);
 251         ret |= get_user(addr, &argp->cmap.green);
 252         ret |= put_user(compat_ptr(addr), &p->cmap.green);
 253         ret |= get_user(addr, &argp->cmap.blue);
 254         ret |= put_user(compat_ptr(addr), &p->cmap.blue);
 255         ret |= get_user(addr, &argp->mask);
 256         ret |= put_user(compat_ptr(addr), &p->mask);
 257         ret |= get_user(addr, &argp->image);
 258         ret |= put_user(compat_ptr(addr), &p->image);
 259         if (ret)
 260                 return -EFAULT;
 261         return info->fbops->fb_ioctl(info, FBIOSCURSOR, (unsigned long)p);
 262 }
 263
 264 int sbusfb_compat_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg)
 265 {
 266         switch (cmd) {
 267         case FBIOGTYPE:
 268         case FBIOSATTR:
 269         case FBIOGATTR:
 270         case FBIOSVIDEO:
 271         case FBIOGVIDEO:
 272         case FBIOGCURSOR32:     /* This is not implemented yet.
 273                                    Later it should be converted... */
 274         case FBIOSCURPOS:
 275         case FBIOGCURPOS:
 276         case FBIOGCURMAX:
 277                 return info->fbops->fb_ioctl(info, cmd, arg);
 278         case FBIOPUTCMAP32:
 279                 return fbiogetputcmap(info, cmd, arg);
 280         case FBIOGETCMAP32:
 281                 return fbiogetputcmap(info, cmd, arg);
 282         case FBIOSCURSOR32:
 283                 return fbiogscursor(info, arg);
 284         default:
 285                 return -ENOIOCTLCMD;
 286         }
 287 }
 288 EXPORT_SYMBOL(sbusfb_compat_ioctl);
 289 #endif