1 #include <linux/types.h>
2 #include <linux/kernel.h>
6 #include <linux/console.h>
9 #include <asm/bootinfo.h>
10 #include <asm/system.h>
11 #include <asm/pgtable.h>
12 #include <asm/apollodma.h>
15 /* note only works for 16 Bit 1 page DMA's */
17 static unsigned short next_free_xlat_entry=0;
19 unsigned short dma_map_page(unsigned long phys_addr,int count,int type) {
21 unsigned long page_aligned_addr=phys_addr & (~((1<<12)-1));
22 unsigned short start_map_addr=page_aligned_addr >> 10;
23 unsigned short free_xlat_entry, *xlat_map_entry;
26 free_xlat_entry=next_free_xlat_entry;
27 for(i=0,xlat_map_entry=addr_xlat_map+(free_xlat_entry<<2);i<8;i++,xlat_map_entry++) {
29 printk("phys_addr: %x, page_aligned_addr: %x, start_map_addr: %x\n",phys_addr,page_aligned_addr,start_map_addr+i);
31 out_be16(xlat_map_entry, start_map_addr+i);
34 next_free_xlat_entry+=2;
35 if(next_free_xlat_entry>125)
36 next_free_xlat_entry=0;
39 printk("next_free_xlat_entry: %d\n",next_free_xlat_entry);
42 return free_xlat_entry<<10;
45 void dma_unmap_page(unsigned short dma_addr) {