patch-2.1.96 linux/include/asm-arm/dma.h

• Lines: 124
• Date: Sun Apr 12 11:42:16 1998
• Orig file: v2.1.95/linux/include/asm-arm/dma.h
• Orig date: Tue Jan 20 16:39:42 1998

diff -u --recursive --new-file v2.1.95/linux/include/asm-arm/dma.h linux/include/asm-arm/dma.h
@@ -1,28 +1,105 @@
 #ifndef __ASM_ARM_DMA_H
 #define __ASM_ARM_DMA_H
 
-#include <asm/irq.h>
+typedef unsigned int dmach_t;
 
-#define MAX_DMA_CHANNELS	14
-#define DMA_0			8
-#define DMA_1			9
-#define DMA_2			10
-#define DMA_3			11
-#define DMA_S0			12
-#define DMA_S1			13
+#include <asm/irq.h>
+#include <asm/arch/dma.h>
 
-#define DMA_MODE_READ		0x44
-#define DMA_MODE_WRITE		0x48
+typedef struct {
+	unsigned long address;
+	unsigned long length;
+} dmasg_t;
 
 extern const char dma_str[];
 
-#include <asm/arch/dma.h>
-
-/* These are in kernel/dma.c: */
-/* reserve a DMA channel */
-extern int request_dma(unsigned int dmanr, const char * device_id);
-/* release it again */
-extern void free_dma(unsigned int dmanr);
+/* Clear the 'DMA Pointer Flip Flop'.
+ * Write 0 for LSB/MSB, 1 for MSB/LSB access.
+ *
+ * NOTE: This is an architecture specific function, and should
+ *       be hidden from the drivers.
+ */
+#define clear_dma_ff(channel)
+
+/* Set only the page register bits of the transfer address.
+ *
+ * NOTE: This is an architecture specific function, and should
+ *       be hidden from the drivers
+ */
+static __inline__ void set_dma_page(dmach_t channel, char pagenr)
+{
+	printk(dma_str, "set_dma_page", channel);
+}
+
+/* Request a DMA channel
+ *
+ * Some architectures may need to do allocate an interrupt
+ */
+extern int  request_dma(dmach_t channel, const char * device_id);
+
+/* Free a DMA channel
+ *
+ * Some architectures may need to do free an interrupt
+ */
+extern void free_dma(dmach_t channel);
+
+/* Enable DMA for this channel
+ *
+ * On some architectures, this may have other side effects like
+ * enabling an interrupt and setting the DMA registers.
+ */
+extern void enable_dma(dmach_t channel);
+
+/* Disable DMA for this channel
+ *
+ * On some architectures, this may have other side effects like
+ * disabling an interrupt or whatever.
+ */
+extern void disable_dma(dmach_t channel);
+
+/* Set the DMA scatter gather list for this channel
+ *
+ * This should not be called if a DMA channel is enabled,
+ * especially since some DMA architectures don't update the
+ * DMA address immediately, but defer it to the enable_dma().
+ */
+extern void set_dma_sg(dmach_t channel, dmasg_t *sg, int nr_sg);
+
+/* Set the DMA address for this channel
+ *
+ * This should not be called if a DMA channel is enabled,
+ * especially since some DMA architectures don't update the
+ * DMA address immediately, but defer it to the enable_dma().
+ */
+extern void set_dma_addr(dmach_t channel, unsigned long physaddr);
+
+/* Set the DMA byte count for this channel
+ *
+ * This should not be called if a DMA channel is enabled,
+ * especially since some DMA architectures don't update the
+ * DMA count immediately, but defer it to the enable_dma().
+ */
+extern void set_dma_count(dmach_t channel, unsigned long count);
+
+/* Set the transfer direction for this channel
+ *
+ * This should not be called if a DMA channel is enabled,
+ * especially since some DMA architectures don't update the
+ * DMA transfer direction immediately, but defer it to the
+ * enable_dma().
+ */
+extern void set_dma_mode(dmach_t channel, dmamode_t mode);
+
+/* 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.
+ */
+extern int  get_dma_residue(dmach_t channel);
+
+#ifndef NO_DMA
+#define NO_DMA	255
+#endif
 
 #endif /* _ARM_DMA_H */
-