1 // SPDX-License-Identifier: GPL-2.0 1 // SPDX-License-Identifier: GPL-2.0
2 /* 2 /*
3 * linux/arch/m68k/sun3/dvma.c 3 * linux/arch/m68k/sun3/dvma.c
4 * 4 *
5 * Written by Sam Creasey 5 * Written by Sam Creasey
6 * 6 *
7 * Sun3 IOMMU routines used for dvma accesses. 7 * Sun3 IOMMU routines used for dvma accesses.
8 * 8 *
9 */ 9 */
10 10
11 #include <linux/init.h> 11 #include <linux/init.h>
12 #include <linux/kernel.h> 12 #include <linux/kernel.h>
13 #include <linux/mm.h> 13 #include <linux/mm.h>
14 #include <linux/memblock.h> 14 #include <linux/memblock.h>
15 #include <linux/list.h> 15 #include <linux/list.h>
16 #include <asm/page.h> 16 #include <asm/page.h>
17 #include <asm/sun3mmu.h> 17 #include <asm/sun3mmu.h>
18 #include <asm/dvma.h> 18 #include <asm/dvma.h>
19 19
20 20
21 static unsigned long ptelist[120]; 21 static unsigned long ptelist[120];
22 22
23 static unsigned long dvma_page(unsigned long k 23 static unsigned long dvma_page(unsigned long kaddr, unsigned long vaddr)
24 { 24 {
25 unsigned long pte; 25 unsigned long pte;
26 unsigned long j; 26 unsigned long j;
27 pte_t ptep; 27 pte_t ptep;
28 28
29 j = *(volatile unsigned long *)kaddr; 29 j = *(volatile unsigned long *)kaddr;
30 *(volatile unsigned long *)kaddr = j; 30 *(volatile unsigned long *)kaddr = j;
31 31
32 ptep = pfn_pte(virt_to_pfn((void *)kad 32 ptep = pfn_pte(virt_to_pfn((void *)kaddr), PAGE_KERNEL);
33 pte = pte_val(ptep); 33 pte = pte_val(ptep);
34 // pr_info("dvma_remap: addr %lx -> %lx p 34 // pr_info("dvma_remap: addr %lx -> %lx pte %08lx\n", kaddr, vaddr, pte);
35 if(ptelist[(vaddr & 0xff000) >> PAGE_S 35 if(ptelist[(vaddr & 0xff000) >> PAGE_SHIFT] != pte) {
36 sun3_put_pte(vaddr, pte); 36 sun3_put_pte(vaddr, pte);
37 ptelist[(vaddr & 0xff000) >> P 37 ptelist[(vaddr & 0xff000) >> PAGE_SHIFT] = pte;
38 } 38 }
39 39
40 return (vaddr + (kaddr & ~PAGE_MASK)); 40 return (vaddr + (kaddr & ~PAGE_MASK));
41 41
42 } 42 }
43 43
44 int dvma_map_iommu(unsigned long kaddr, unsign 44 int dvma_map_iommu(unsigned long kaddr, unsigned long baddr,
45 int len) 45 int len)
46 { 46 {
47 47
48 unsigned long end; 48 unsigned long end;
49 unsigned long vaddr; 49 unsigned long vaddr;
50 50
51 vaddr = dvma_btov(baddr); 51 vaddr = dvma_btov(baddr);
52 52
53 end = vaddr + len; 53 end = vaddr + len;
54 54
55 while(vaddr < end) { 55 while(vaddr < end) {
56 dvma_page(kaddr, vaddr); 56 dvma_page(kaddr, vaddr);
57 kaddr += PAGE_SIZE; 57 kaddr += PAGE_SIZE;
58 vaddr += PAGE_SIZE; 58 vaddr += PAGE_SIZE;
59 } 59 }
60 60
61 return 0; 61 return 0;
62 62
63 } 63 }
64 64
65 void __init sun3_dvma_init(void) 65 void __init sun3_dvma_init(void)
66 { 66 {
67 memset(ptelist, 0, sizeof(ptelist)); 67 memset(ptelist, 0, sizeof(ptelist));
68 } 68 }
69 69
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