arch/m68k/apollo/dma.c

   1 #include <linux/types.h>
   2 #include <linux/kernel.h>
   3 #include <linux/mm.h>
   4 #include <linux/kd.h>
   5 #include <linux/tty.h>
   6 #include <linux/console.h>
   7
   8 #include <asm/setup.h>
   9 #include <asm/bootinfo.h>
  10 #include <asm/system.h>
  11 #include <asm/pgtable.h>
  12 #include <asm/apollodma.h>
  13 #include <asm/io.h>
  14
  15 /* note only works for 16 Bit 1 page DMA's */
  16
  17 static unsigned short next_free_xlat_entry=0;
  18
  19 unsigned short dma_map_page(unsigned long phys_addr,int count,int type) {
  20
  21         unsigned long page_aligned_addr=phys_addr & (~((1<<12)-1));
  22         unsigned short start_map_addr=page_aligned_addr >> 10;
  23         unsigned short free_xlat_entry, *xlat_map_entry;
  24         int i;
  25
  26         free_xlat_entry=next_free_xlat_entry;
  27         for(i=0,xlat_map_entry=addr_xlat_map+(free_xlat_entry<<2);i<8;i++,xlat_map_entry++) {
  28 #if 0
  29                 printk("phys_addr: %x, page_aligned_addr: %x, start_map_addr: %x\n",phys_addr,page_aligned_addr,start_map_addr+i);
  30 #endif
  31                 out_be16(xlat_map_entry, start_map_addr+i);
  32         }
  33
  34         next_free_xlat_entry+=2;
  35         if(next_free_xlat_entry>125)
  36                 next_free_xlat_entry=0;
  37
  38 #if 0
  39         printk("next_free_xlat_entry: %d\n",next_free_xlat_entry);
  40 #endif
  41
  42         return free_xlat_entry<<10;
  43 }
  44
  45 void dma_unmap_page(unsigned short dma_addr) {
  46
  47         return ;
  48
  49 }
  50