Commit | Line | Data |
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1da177e4 LT |
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 | ||
07b81259 | 22 | static unsigned long dvma_page(unsigned long kaddr, unsigned long vaddr) |
1da177e4 LT |
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 | ||
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 | ||
65 | void sun3_dvma_init(void) | |
66 | { | |
67 | ||
68 | memset(ptelist, 0, sizeof(ptelist)); | |
69 | ||
70 | ||
71 | } |