patch-2.3.41 linux/arch/m68k/apollo/dma.c

• Lines: 50
• Date: Fri Jan 28 08:04:58 2000
• Orig file: v2.3.40/linux/arch/m68k/apollo/dma.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.40/linux/arch/m68k/apollo/dma.c linux/arch/m68k/apollo/dma.c
@@ -0,0 +1,49 @@
+#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>
+
+/* 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
+		outw(start_map_addr+i, xlat_map_entry);
+	}
+
+	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 ;
+
+}
+