Commit | Line | Data |
---|---|---|
b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * linux/arch/m68k/sun3/dvma.c | |
4 | * | |
5 | * Written by Sam Creasey | |
6 | * | |
7 | * Sun3 IOMMU routines used for dvma accesses. | |
8 | * | |
9 | */ | |
10 | ||
a4df02a2 | 11 | #include <linux/init.h> |
1da177e4 LT |
12 | #include <linux/kernel.h> |
13 | #include <linux/mm.h> | |
57c8a661 | 14 | #include <linux/memblock.h> |
1da177e4 LT |
15 | #include <linux/list.h> |
16 | #include <asm/page.h> | |
17 | #include <asm/pgtable.h> | |
18 | #include <asm/sun3mmu.h> | |
19 | #include <asm/dvma.h> | |
20 | ||
21 | ||
22 | static unsigned long ptelist[120]; | |
23 | ||
07b81259 | 24 | static unsigned long dvma_page(unsigned long kaddr, unsigned long vaddr) |
1da177e4 LT |
25 | { |
26 | unsigned long pte; | |
27 | unsigned long j; | |
28 | pte_t ptep; | |
29 | ||
30 | j = *(volatile unsigned long *)kaddr; | |
31 | *(volatile unsigned long *)kaddr = j; | |
32 | ||
33 | ptep = pfn_pte(virt_to_pfn(kaddr), PAGE_KERNEL); | |
34 | pte = pte_val(ptep); | |
56bbd862 | 35 | // pr_info("dvma_remap: addr %lx -> %lx pte %08lx\n", kaddr, vaddr, pte); |
1da177e4 LT |
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 | ||
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 | ||
a4df02a2 | 66 | void __init sun3_dvma_init(void) |
1da177e4 | 67 | { |
1da177e4 | 68 | memset(ptelist, 0, sizeof(ptelist)); |
1da177e4 | 69 | } |