patch-1.3.81 linux/include/asm-alpha/dma.h

• Lines: 27
• Date: Sat Mar 30 13:50:12 1996
• Orig file: v1.3.80/linux/include/asm-alpha/dma.h
• Orig date: Tue Aug 1 10:02:44 1995

diff -u --recursive --new-file v1.3.80/linux/include/asm-alpha/dma.h linux/include/asm-alpha/dma.h
@@ -18,6 +18,8 @@
 #ifndef _ASM_DMA_H
 #define _ASM_DMA_H
 
+#include <linux/config.h>
+
 #include <asm/io.h>		/* need byte IO */
 
 #define dma_outb	outb
@@ -73,8 +75,16 @@
 
 #define MAX_DMA_CHANNELS	8
 
-/* The maximum address that we can perform a DMA transfer to on this platform */
+#ifdef CONFIG_ALPHA_XL
+/* The maximum address that we can perform a DMA transfer to on Alpha XL,
+   due to a hardware SIO (PCI<->ISA bus bridge) chip limitation, is 64MB.
+   see <asm/apecs.h> for more info */
+#define MAX_DMA_ADDRESS		(0xfffffc0004000000UL)
+#else /* CONFIG_ALPHA_XL */
+/* The maximum address that we can perform a DMA transfer to on normal
+   Alpha platforms */
 #define MAX_DMA_ADDRESS		(~0UL)
+#endif /* CONFIG_ALPHA_XL */
 
 /* 8237 DMA controllers */
 #define IO_DMA1_BASE	0x00	/* 8 bit slave DMA, channels 0..3 */