// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/arch/m68k/sun3/dvma.c
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*
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* Written by Sam Creasey
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*
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* Sun3 IOMMU routines used for dvma accesses.
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*
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/memblock.h>
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#include <linux/list.h>
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#include <asm/page.h>
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#include <asm/sun3mmu.h>
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#include <asm/dvma.h>
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static unsigned long ptelist[120];
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static unsigned long dvma_page(unsigned long kaddr, unsigned long vaddr)
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{
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unsigned long pte;
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unsigned long j;
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pte_t ptep;
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j = *(volatile unsigned long *)kaddr;
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*(volatile unsigned long *)kaddr = j;
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ptep = pfn_pte(virt_to_pfn(kaddr), PAGE_KERNEL);
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pte = pte_val(ptep);
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// pr_info("dvma_remap: addr %lx -> %lx pte %08lx\n", kaddr, vaddr, pte);
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if(ptelist[(vaddr & 0xff000) >> PAGE_SHIFT] != pte) {
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sun3_put_pte(vaddr, pte);
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ptelist[(vaddr & 0xff000) >> PAGE_SHIFT] = pte;
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}
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return (vaddr + (kaddr & ~PAGE_MASK));
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}
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int dvma_map_iommu(unsigned long kaddr, unsigned long baddr,
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int len)
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{
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unsigned long end;
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unsigned long vaddr;
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vaddr = dvma_btov(baddr);
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end = vaddr + len;
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while(vaddr < end) {
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dvma_page(kaddr, vaddr);
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kaddr += PAGE_SIZE;
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vaddr += PAGE_SIZE;
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}
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return 0;
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}
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void __init sun3_dvma_init(void)
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{
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memset(ptelist, 0, sizeof(ptelist));
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}
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