1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * linux/arch/m68k/sun3/dvma.c
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Written by Sam Creasey
6*4882a593Smuzhiyun *
7*4882a593Smuzhiyun * Sun3 IOMMU routines used for dvma accesses.
8*4882a593Smuzhiyun *
9*4882a593Smuzhiyun */
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun #include <linux/init.h>
12*4882a593Smuzhiyun #include <linux/kernel.h>
13*4882a593Smuzhiyun #include <linux/mm.h>
14*4882a593Smuzhiyun #include <linux/memblock.h>
15*4882a593Smuzhiyun #include <linux/list.h>
16*4882a593Smuzhiyun #include <asm/page.h>
17*4882a593Smuzhiyun #include <asm/sun3mmu.h>
18*4882a593Smuzhiyun #include <asm/dvma.h>
19*4882a593Smuzhiyun
20*4882a593Smuzhiyun
21*4882a593Smuzhiyun static unsigned long ptelist[120];
22*4882a593Smuzhiyun
dvma_page(unsigned long kaddr,unsigned long vaddr)23*4882a593Smuzhiyun static unsigned long dvma_page(unsigned long kaddr, unsigned long vaddr)
24*4882a593Smuzhiyun {
25*4882a593Smuzhiyun unsigned long pte;
26*4882a593Smuzhiyun unsigned long j;
27*4882a593Smuzhiyun pte_t ptep;
28*4882a593Smuzhiyun
29*4882a593Smuzhiyun j = *(volatile unsigned long *)kaddr;
30*4882a593Smuzhiyun *(volatile unsigned long *)kaddr = j;
31*4882a593Smuzhiyun
32*4882a593Smuzhiyun ptep = pfn_pte(virt_to_pfn(kaddr), PAGE_KERNEL);
33*4882a593Smuzhiyun pte = pte_val(ptep);
34*4882a593Smuzhiyun // pr_info("dvma_remap: addr %lx -> %lx pte %08lx\n", kaddr, vaddr, pte);
35*4882a593Smuzhiyun if(ptelist[(vaddr & 0xff000) >> PAGE_SHIFT] != pte) {
36*4882a593Smuzhiyun sun3_put_pte(vaddr, pte);
37*4882a593Smuzhiyun ptelist[(vaddr & 0xff000) >> PAGE_SHIFT] = pte;
38*4882a593Smuzhiyun }
39*4882a593Smuzhiyun
40*4882a593Smuzhiyun return (vaddr + (kaddr & ~PAGE_MASK));
41*4882a593Smuzhiyun
42*4882a593Smuzhiyun }
43*4882a593Smuzhiyun
dvma_map_iommu(unsigned long kaddr,unsigned long baddr,int len)44*4882a593Smuzhiyun int dvma_map_iommu(unsigned long kaddr, unsigned long baddr,
45*4882a593Smuzhiyun int len)
46*4882a593Smuzhiyun {
47*4882a593Smuzhiyun
48*4882a593Smuzhiyun unsigned long end;
49*4882a593Smuzhiyun unsigned long vaddr;
50*4882a593Smuzhiyun
51*4882a593Smuzhiyun vaddr = dvma_btov(baddr);
52*4882a593Smuzhiyun
53*4882a593Smuzhiyun end = vaddr + len;
54*4882a593Smuzhiyun
55*4882a593Smuzhiyun while(vaddr < end) {
56*4882a593Smuzhiyun dvma_page(kaddr, vaddr);
57*4882a593Smuzhiyun kaddr += PAGE_SIZE;
58*4882a593Smuzhiyun vaddr += PAGE_SIZE;
59*4882a593Smuzhiyun }
60*4882a593Smuzhiyun
61*4882a593Smuzhiyun return 0;
62*4882a593Smuzhiyun
63*4882a593Smuzhiyun }
64*4882a593Smuzhiyun
sun3_dvma_init(void)65*4882a593Smuzhiyun void __init sun3_dvma_init(void)
66*4882a593Smuzhiyun {
67*4882a593Smuzhiyun memset(ptelist, 0, sizeof(ptelist));
68*4882a593Smuzhiyun }
69