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