patch-2.1.96 linux/arch/arm/kernel/dma.h

• Lines: 71
• Date: Sun Apr 12 11:42:15 1998
• Orig file: v2.1.95/linux/arch/arm/kernel/dma.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.95/linux/arch/arm/kernel/dma.h linux/arch/arm/kernel/dma.h
@@ -0,0 +1,70 @@
+/*
+ * arch/arm/kernel/dma.h
+ *
+ * Copyright (C) 1998 Russell King
+ *
+ * This header file describes the interface between the generic DMA handler
+ * (dma.c) and the architecture-specific DMA backends (dma-*.c)
+ */
+
+typedef struct {
+	dmasg_t		buf;		/* single DMA			*/
+	int		sgcount;	/* number of DMA SG		*/
+	dmasg_t		*sg;		/* DMA Scatter-Gather List	*/
+
+	unsigned int	active:1;	/* Transfer active		*/
+	unsigned int	invalid:1;	/* Address/Count changed	*/
+	dmamode_t	dma_mode;	/* DMA mode			*/
+
+	unsigned int	lock;		/* Device is allocated		*/
+	const char	*device_id;	/* Device name			*/
+
+	unsigned int	dma_base;	/* Controller base address	*/
+	int		dma_irq;	/* Controller IRQ		*/
+	int		state;		/* Controller state		*/
+	dmasg_t		cur_sg;		/* Current controller buffer	*/
+} dma_t;
+
+/* Prototype: int arch_request_dma(channel, dma, dev_id)
+ * Purpose  : Perform architecture specific claiming of a DMA channel
+ * Params   : channel - DMA channel number
+ *          : dma     - DMA structure (above) for channel
+ *          : dev_id  - device ID string passed with request
+ * Returns  : 0 on success, E????? number on error
+ */ 
+int arch_request_dma(dmach_t channel, dma_t *dma, const char *dev_id);
+
+/* Prototype: int arch_free_dma(channel, dma)
+ * Purpose  : Perform architecture specific freeing of a DMA channel
+ * Params   : channel - DMA channel number
+ *          : dma     - DMA structure for channel
+ */
+void arch_free_dma(dmach_t channel, dma_t *dma);
+
+/* Prototype: void arch_enable_dma(channel, dma)
+ * Purpose  : Enable a claimed DMA channel
+ * Params   : channel - DMA channel number
+ *          : dma     - DMA structure for channel
+ */
+void arch_enable_dma(dmach_t channel, dma_t *dma);
+
+/* Prototype: void arch_disable_dma(channel, dma)
+ * Purpose  : Disable a claimed DMA channel
+ * Params   : channel - DMA channel number
+ *          : dma     - DMA structure for channel
+ */
+void arch_disable_dma(dmach_t channel, dma_t *dma);
+
+/* Prototype: int arch_get_dma_residue(channel, dma)
+ * Purpose  : Return number of bytes left to DMA
+ * Params   : channel - DMA channel number
+ *          : dma     - DMA structure for channel
+ * Returns  : Number of bytes left to DMA
+ */
+int arch_get_dma_residue(dmach_t channel, dma_t *dma);
+
+/* Prototype: void arch_dma_init(dma)
+ * Purpose  : Initialise architecture specific DMA
+ * Params   : dma - pointer to array of DMA structures
+ */
+void arch_dma_init(dma_t *dma);