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
20 static unsigned long ptelist[120];
21
dvma_page(unsigned long kaddr,unsigned long vaddr)22 static 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
dvma_map_iommu(unsigned long kaddr,unsigned long baddr,int len)44 int 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
sun3_dvma_init(void)65 void sun3_dvma_init(void)
66 {
67
68 memset(ptelist, 0, sizeof(ptelist));
69
70
71 }
72