1 /* 2 * linux/arch/m68k/sun3/dvma.c 3 * 4 * Written by Sam Creasey 5 * 6 * Sun3 IOMMU routines used for dvma accesses. 7 * 8 */ 9 10 #include <linux/init.h> 11 #include <linux/kernel.h> 12 #include <linux/mm.h> 13 #include <linux/bootmem.h> 14 #include <linux/list.h> 15 #include <asm/page.h> 16 #include <asm/pgtable.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(kaddr), PAGE_KERNEL); 33 pte = pte_val(ptep); 34 // printk("dvma_remap: addr %lx -> %lx pte %08lx len %x\n", 35 // kaddr, vaddr, pte, len); 36 if(ptelist[(vaddr & 0xff000) >> PAGE_SHIFT] != pte) { 37 sun3_put_pte(vaddr, pte); 38 ptelist[(vaddr & 0xff000) >> PAGE_SHIFT] = pte; 39 } 40 41 return (vaddr + (kaddr & ~PAGE_MASK)); 42 43 } 44 45 int dvma_map_iommu(unsigned long kaddr, unsigned long baddr, 46 int len) 47 { 48 49 unsigned long end; 50 unsigned long vaddr; 51 52 vaddr = dvma_btov(baddr); 53 54 end = vaddr + len; 55 56 while(vaddr < end) { 57 dvma_page(kaddr, vaddr); 58 kaddr += PAGE_SIZE; 59 vaddr += PAGE_SIZE; 60 } 61 62 return 0; 63 64 } 65 66 void __init sun3_dvma_init(void) 67 { 68 memset(ptelist, 0, sizeof(ptelist)); 69 } 70