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