diff options
Diffstat (limited to 'arch/m68k/apollo/dma.c')
| -rw-r--r-- | arch/m68k/apollo/dma.c | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/arch/m68k/apollo/dma.c b/arch/m68k/apollo/dma.c new file mode 100644 index 0000000..aed8be1 --- /dev/null +++ b/arch/m68k/apollo/dma.c @@ -0,0 +1,50 @@ +#include <linux/types.h> +#include <linux/kernel.h> +#include <linux/mm.h> +#include <linux/kd.h> +#include <linux/tty.h> +#include <linux/console.h> + +#include <asm/setup.h> +#include <asm/bootinfo.h> +#include <asm/system.h> +#include <asm/pgtable.h> +#include <asm/apollodma.h> +#include <asm/io.h> + +/* note only works for 16 Bit 1 page DMA's */ + +static unsigned short next_free_xlat_entry=0; + +unsigned short dma_map_page(unsigned long phys_addr,int count,int type) { + + unsigned long page_aligned_addr=phys_addr & (~((1<<12)-1)); + unsigned short start_map_addr=page_aligned_addr >> 10; + unsigned short free_xlat_entry, *xlat_map_entry; + int i; + + free_xlat_entry=next_free_xlat_entry; + for(i=0,xlat_map_entry=addr_xlat_map+(free_xlat_entry<<2);i<8;i++,xlat_map_entry++) { +#if 0 + printk("phys_addr: %x, page_aligned_addr: %x, start_map_addr: %x\n",phys_addr,page_aligned_addr,start_map_addr+i); +#endif + out_be16(xlat_map_entry, start_map_addr+i); + } + + next_free_xlat_entry+=2; + if(next_free_xlat_entry>125) + next_free_xlat_entry=0; + +#if 0 + printk("next_free_xlat_entry: %d\n",next_free_xlat_entry); +#endif + + return free_xlat_entry<<10; +} + +void dma_unmap_page(unsigned short dma_addr) { + + return ; + +} + |