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/kernel.h>
   7 #include <linux/module.h>
   8 #include <linux/string.h>
   9 #include <linux/fb.h>
  10 #include <linux/mm.h>
  11
  12 #include <asm/oplib.h>
  13 #include <asm/fbio.h>
  14
  15 #include "sbuslib.h"
  16
  17 void sbusfb_fill_var(struct fb_var_screeninfo *var, int prom_node, int bpp)
  18 {
  19         memset(var, 0, sizeof(*var));
  20
  21         var->xres = prom_getintdefault(prom_node, "width", 1152);
  22         var->yres = prom_getintdefault(prom_node, "height", 900);
  23         var->xres_virtual = var->xres;
  24         var->yres_virtual = var->yres;
  25         var->bits_per_pixel = bpp;
  26 }
  27
  28 EXPORT_SYMBOL(sbusfb_fill_var);
  29
  30 static unsigned long sbusfb_mmapsize(long size, unsigned long fbsize)
  31 {
  32         if (size == SBUS_MMAP_EMPTY) return 0;
  33         if (size >= 0) return size;
  34         return fbsize * (-size);
  35 }
  36
  37 int sbusfb_mmap_helper(struct sbus_mmap_map *map,
  38                        unsigned long physbase,
  39                        unsigned long fbsize,
  40                        unsigned long iospace,
  41                        struct vm_area_struct *vma)
  42 {
  43         unsigned int size, page, r, map_size;
  44         unsigned long map_offset = 0;
  45         unsigned long off;
  46         int i;
  47
  48         size = vma->vm_end - vma->vm_start;
  49         if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
  50                 return -EINVAL;
  51
  52         off = vma->vm_pgoff << PAGE_SHIFT;
  53
  54         /* To stop the swapper from even considering these pages */
  55         vma->vm_flags |= (VM_SHM | VM_IO | VM_LOCKED);
  56
  57         /* Each page, see which map applies */
  58         for (page = 0; page < size; ){
  59                 map_size = 0;
  60                 for (i = 0; map[i].size; i++)
  61                         if (map[i].voff == off+page) {
  62                                 map_size = sbusfb_mmapsize(map[i].size, fbsize);
  63 #ifdef __sparc_v9__
  64 #define POFF_MASK       (PAGE_MASK|0x1UL)
  65 #else
  66 #define POFF_MASK       (PAGE_MASK)
  67 #endif
  68                                 map_offset = (physbase + map[i].poff) & POFF_MASK;
  69                                 break;
  70                         }
  71                 if (!map_size){
  72                         page += PAGE_SIZE;
  73                         continue;
  74                 }
  75                 if (page + map_size > size)
  76                         map_size = size - page;
  77                 r = io_remap_page_range(vma,
  78                                         vma->vm_start + page,
  79                                         map_offset, map_size,
  80                                         vma->vm_page_prot, iospace);
  81                 if (r)
  82                         return -EAGAIN;
  83                 page += map_size;
  84         }
  85
  86         return 0;
  87 }
  88 EXPORT_SYMBOL(sbusfb_mmap_helper);
  89
  90 int sbusfb_ioctl_helper(unsigned long cmd, unsigned long arg,
  91                         struct fb_info *info,
  92                         int type, int fb_depth, unsigned long fb_size)
  93 {
  94         switch(cmd) {
  95         case FBIOGTYPE: {
  96                 struct fbtype __user *f = (struct fbtype __user *) arg;
  97
  98                 if (put_user(type, &f->fb_type) ||
  99                     __put_user(info->var.yres, &f->fb_height) ||
 100                     __put_user(info->var.xres, &f->fb_width) ||
 101                     __put_user(fb_depth, &f->fb_depth) ||
 102                     __put_user(0, &f->fb_cmsize) ||
 103                     __put_user(fb_size, &f->fb_cmsize))
 104                         return -EFAULT;
 105                 return 0;
 106         }
 107         case FBIOPUTCMAP_SPARC: {
 108                 struct fbcmap __user *c = (struct fbcmap __user *) arg;
 109                 struct fb_cmap cmap;
 110                 u16 red, green, blue;
 111                 unsigned char __user *ured;
 112                 unsigned char __user *ugreen;
 113                 unsigned char __user *ublue;
 114                 int index, count, i;
 115
 116                 if (get_user(index, &c->index) ||
 117                     __get_user(count, &c->count) ||
 118                     __get_user(ured, &c->red) ||
 119                     __get_user(ugreen, &c->green) ||
 120                     __get_user(ublue, &c->blue))
 121                         return -EFAULT;
 122
 123                 cmap.len = 1;
 124                 cmap.red = &red;
 125                 cmap.green = &green;
 126                 cmap.blue = &blue;
 127                 cmap.transp = NULL;
 128                 for (i = 0; i < count; i++) {
 129                         int err;
 130
 131                         if (get_user(red, &ured[i]) ||
 132                             get_user(green, &ugreen[i]) ||
 133                             get_user(blue, &ublue[i]))
 134                                 return -EFAULT;
 135
 136                         cmap.start = index + i;
 137                         err = fb_set_cmap(&cmap, info);
 138                         if (err)
 139                                 return err;
 140                 }
 141                 return 0;
 142         }
 143         case FBIOGETCMAP_SPARC: {
 144                 struct fbcmap __user *c = (struct fbcmap __user *) arg;
 145                 unsigned char __user *ured;
 146                 unsigned char __user *ugreen;
 147                 unsigned char __user *ublue;
 148                 struct fb_cmap *cmap = &info->cmap;
 149                 int index, count, i;
 150
 151                 if (get_user(index, &c->index) ||
 152                     __get_user(count, &c->count) ||
 153                     __get_user(ured, &c->red) ||
 154                     __get_user(ugreen, &c->green) ||
 155                     __get_user(ublue, &c->blue))
 156                         return -EFAULT;
 157
 158                 if (index + count > cmap->len)
 159                         return -EINVAL;
 160
 161                 for (i = 0; i < count; i++) {
 162                         if (put_user(cmap->red[index + i], &ured[i]) ||
 163                             put_user(cmap->green[index + i], &ugreen[i]) ||
 164                             put_user(cmap->blue[index + i], &ublue[i]))
 165                                 return -EFAULT;
 166                 }
 167                 return 0;
 168         }
 169         default:
 170                 return -EINVAL;
 171         };
 172 }
 173 EXPORT_SYMBOL(sbusfb_ioctl_helper);