patch-2.1.80 linux/include/asm-arm/arch-arc/dma.h

• Lines: 96
• Date: Tue Jan 20 16:39:42 1998
• Orig file: v2.1.79/linux/include/asm-arm/arch-arc/dma.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.79/linux/include/asm-arm/arch-arc/dma.h linux/include/asm-arm/arch-arc/dma.h
@@ -0,0 +1,95 @@
+#ifndef __ASM_ARCH_DMA_H
+#define __ASM_ARCH_DMA_H
+
+#define MAX_DMA_ADDRESS		0x03000000
+
+#ifdef KERNEL_ARCH_DMA
+
+static inline void arch_disable_dma (int dmanr)
+{
+    printk (dma_str, "arch_disable_dma", dmanr);
+}
+
+static inline void arch_enable_dma (int dmanr)
+{
+    printk (dma_str, "arch_enable_dma", dmanr);
+}
+
+static inline void arch_set_dma_addr (int dmanr, unsigned int addr)
+{
+    printk (dma_str, "arch_set_dma_addr", dmanr);
+}
+
+static inline void arch_set_dma_count (int dmanr, unsigned int count)
+{
+    printk (dma_str, "arch_set_dma_count", dmanr);
+}
+
+static inline void arch_set_dma_mode (int dmanr, char mode)
+{
+    printk (dma_str, "arch_set_dma_mode", dmanr);
+}
+
+static inline int arch_dma_count (int dmanr)
+{
+    printk (dma_str, "arch_dma_count", dmanr);
+    return 0;
+}
+
+#endif
+
+/* enable/disable a specific DMA channel */
+extern void enable_dma(unsigned int dmanr);
+
+static __inline__ void disable_dma(unsigned int dmanr)
+{
+    switch(dmanr) {
+    case 0:  disable_irq(64); break;
+    case 1:  break;
+    default: printk (dma_str, "disable_dma", dmanr); break;
+    }
+}
+
+/* Clear the 'DMA Pointer Flip Flop'.
+ * Write 0 for LSB/MSB, 1 for MSB/LSB access.
+ * Use this once to initialize the FF to a known state.
+ * After that, keep track of it. :-)
+ * --- In order to do that, the DMA routines below should ---
+ * --- only be used while interrupts are disabled! ---
+ */
+#define clear_dma_ff(dmanr)
+
+/* set mode (above) for a specific DMA channel */
+extern void set_dma_mode(unsigned int dmanr, char mode);
+
+/* Set only the page register bits of the transfer address.
+ * This is used for successive transfers when we know the contents of
+ * the lower 16 bits of the DMA current address register, but a 64k boundary
+ * may have been crossed.
+ */
+static __inline__ void set_dma_page(unsigned int dmanr, char pagenr)
+{
+    printk (dma_str, "set_dma_page", dmanr);
+}
+
+
+/* Set transfer address & page bits for specific DMA channel.
+ * Assumes dma flipflop is clear.
+ */
+extern void set_dma_addr(unsigned int dmanr, unsigned int addr);
+
+/* Set transfer size for a specific DMA channel.
+ */
+extern void set_dma_count(unsigned int dmanr, unsigned int count);
+
+/* Get DMA residue count. After a DMA transfer, this
+ * should return zero. Reading this while a DMA transfer is
+ * still in progress will return unpredictable results.
+ * If called before the channel has been used, it may return 1.
+ * Otherwise, it returns the number of _bytes_ left to transfer.
+ *
+ * Assumes DMA flip-flop is clear.
+ */
+extern int get_dma_residue(unsigned int dmanr);
+
+#endif /* _ASM_ARCH_DMA_H */