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
21static unsigned long ptelist[120];
22
23static 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
45int 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
66void __init sun3_dvma_init(void)
67{
68	memset(ptelist, 0, sizeof(ptelist));
69}
70