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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Adrian Bunk07b81252008-07-17 21:16:27 +020022static unsigned long dvma_page(unsigned long kaddr, unsigned long vaddr)
Linus Torvalds1da177e2005-04-16 15:20:36 -070023{
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}