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68 lines
1.3 KiB
68 lines
1.3 KiB
// 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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