LXR linux/arch/m68k/sun3/dvma.c

   1/*
   2 * linux/arch/m68k/sun3/dvma.c
   3 *
   4 * Written by Sam Creasey
   5 *
   6 * Sun3 IOMMU routines used for dvma accesses.
   7 *
   8 */
   9
  10#include <linux/kernel.h>
  11#include <linux/mm.h>
  12#include <linux/bootmem.h>
  13#include <linux/list.h>
  14#include <asm/page.h>
  15#include <asm/pgtable.h>
  16#include <asm/sun3mmu.h>
  17#include <asm/dvma.h>
  18
  19
  20static unsigned long ptelist[120];
  21
  22static unsigned long dvma_page(unsigned long kaddr, unsigned long vaddr)
  23{
  24        unsigned long pte;
  25        unsigned long j;
  26        pte_t ptep;
  27
  28        j = *(volatile unsigned long *)kaddr;
  29        *(volatile unsigned long *)kaddr = j;
  30
  31        ptep = pfn_pte(virt_to_pfn(kaddr), PAGE_KERNEL);
  32        pte = pte_val(ptep);
  33//              printk("dvma_remap: addr %lx -> %lx pte %08lx len %x\n",
  34//                     kaddr, vaddr, pte, len);
  35        if(ptelist[(vaddr & 0xff000) >> PAGE_SHIFT] != pte) {
  36                sun3_put_pte(vaddr, pte);
  37                ptelist[(vaddr & 0xff000) >> PAGE_SHIFT] = pte;
  38        }
  39
  40        return (vaddr + (kaddr & ~PAGE_MASK));
  41
  42}
  43
  44int dvma_map_iommu(unsigned long kaddr, unsigned long baddr,
  45                              int len)
  46{
  47
  48        unsigned long end;
  49        unsigned long vaddr;
  50
  51        vaddr = dvma_btov(baddr);
  52
  53        end = vaddr + len;
  54
  55        while(vaddr < end) {
  56                dvma_page(kaddr, vaddr);
  57                kaddr += PAGE_SIZE;
  58                vaddr += PAGE_SIZE;
  59        }
  60
  61        return 0;
  62
  63}
  64
  65void sun3_dvma_init(void)
  66{
  67
  68        memset(ptelist, 0, sizeof(ptelist));
  69
  70
  71}
  72