1b2441318SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0
21da177e4SLinus Torvalds /*
31da177e4SLinus Torvalds * linux/arch/m68k/sun3/dvma.c
41da177e4SLinus Torvalds *
51da177e4SLinus Torvalds * Written by Sam Creasey
61da177e4SLinus Torvalds *
71da177e4SLinus Torvalds * Sun3 IOMMU routines used for dvma accesses.
81da177e4SLinus Torvalds *
91da177e4SLinus Torvalds */
101da177e4SLinus Torvalds
11a4df02a2SGeert Uytterhoeven #include <linux/init.h>
121da177e4SLinus Torvalds #include <linux/kernel.h>
131da177e4SLinus Torvalds #include <linux/mm.h>
1457c8a661SMike Rapoport #include <linux/memblock.h>
151da177e4SLinus Torvalds #include <linux/list.h>
161da177e4SLinus Torvalds #include <asm/page.h>
171da177e4SLinus Torvalds #include <asm/sun3mmu.h>
181da177e4SLinus Torvalds #include <asm/dvma.h>
191da177e4SLinus Torvalds
201da177e4SLinus Torvalds
211da177e4SLinus Torvalds static unsigned long ptelist[120];
221da177e4SLinus Torvalds
dvma_page(unsigned long kaddr,unsigned long vaddr)2307b81259SAdrian Bunk static unsigned long dvma_page(unsigned long kaddr, unsigned long vaddr)
241da177e4SLinus Torvalds {
251da177e4SLinus Torvalds unsigned long pte;
261da177e4SLinus Torvalds unsigned long j;
271da177e4SLinus Torvalds pte_t ptep;
281da177e4SLinus Torvalds
291da177e4SLinus Torvalds j = *(volatile unsigned long *)kaddr;
301da177e4SLinus Torvalds *(volatile unsigned long *)kaddr = j;
311da177e4SLinus Torvalds
32*8f246087SLinus Walleij ptep = pfn_pte(virt_to_pfn((void *)kaddr), PAGE_KERNEL);
331da177e4SLinus Torvalds pte = pte_val(ptep);
3456bbd862SGeert Uytterhoeven // pr_info("dvma_remap: addr %lx -> %lx pte %08lx\n", kaddr, vaddr, pte);
351da177e4SLinus Torvalds if(ptelist[(vaddr & 0xff000) >> PAGE_SHIFT] != pte) {
361da177e4SLinus Torvalds sun3_put_pte(vaddr, pte);
371da177e4SLinus Torvalds ptelist[(vaddr & 0xff000) >> PAGE_SHIFT] = pte;
381da177e4SLinus Torvalds }
391da177e4SLinus Torvalds
401da177e4SLinus Torvalds return (vaddr + (kaddr & ~PAGE_MASK));
411da177e4SLinus Torvalds
421da177e4SLinus Torvalds }
431da177e4SLinus Torvalds
dvma_map_iommu(unsigned long kaddr,unsigned long baddr,int len)441da177e4SLinus Torvalds int dvma_map_iommu(unsigned long kaddr, unsigned long baddr,
451da177e4SLinus Torvalds int len)
461da177e4SLinus Torvalds {
471da177e4SLinus Torvalds
481da177e4SLinus Torvalds unsigned long end;
491da177e4SLinus Torvalds unsigned long vaddr;
501da177e4SLinus Torvalds
511da177e4SLinus Torvalds vaddr = dvma_btov(baddr);
521da177e4SLinus Torvalds
531da177e4SLinus Torvalds end = vaddr + len;
541da177e4SLinus Torvalds
551da177e4SLinus Torvalds while(vaddr < end) {
561da177e4SLinus Torvalds dvma_page(kaddr, vaddr);
571da177e4SLinus Torvalds kaddr += PAGE_SIZE;
581da177e4SLinus Torvalds vaddr += PAGE_SIZE;
591da177e4SLinus Torvalds }
601da177e4SLinus Torvalds
611da177e4SLinus Torvalds return 0;
621da177e4SLinus Torvalds
631da177e4SLinus Torvalds }
641da177e4SLinus Torvalds
sun3_dvma_init(void)65a4df02a2SGeert Uytterhoeven void __init sun3_dvma_init(void)
661da177e4SLinus Torvalds {
671da177e4SLinus Torvalds memset(ptelist, 0, sizeof(ptelist));
681da177e4SLinus Torvalds }
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