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/kernel.h> 11 #include <linux/mm.h> 12 #include <linux/bootmem.h> 13 #include <linux/list.h> 14 #include <asm/page.h> 15 #include <asm/pgtable.h> 16 #include <asm/sun3mmu.h> 17 #include <asm/dvma.h> 18 19 20 static unsigned long ptelist[120]; 21 22 static unsigned long dvma_page(unsigned long kaddr, unsigned long vaddr) 23 { 24 unsigned long pte; 25 unsigned long j; 26 pte_t ptep; 27 28 j = *(volatile unsigned long *)kaddr; 29 *(volatile unsigned long *)kaddr = j; 30 31 ptep = pfn_pte(virt_to_pfn(kaddr), PAGE_KERNEL); 32 pte = pte_val(ptep); 33 // printk("dvma_remap: addr %lx -> %lx pte %08lx len %x\n", 34 // kaddr, vaddr, pte, len); 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 sun3_dvma_init(void) 66 { 67 68 memset(ptelist, 0, sizeof(ptelist)); 69 70 71 } 72