1 files changed, 46 insertions, 0 deletions
diff --git a/arch/arm/include/asm/mach/dma.h b/arch/arm/include/asm/mach/dma.h
new file mode 100644
index 000000000..5ec11d7f0
--- /dev/null
+++ b/arch/arm/include/asm/mach/dma.h
@@ -0,0 +1,46 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ *  arch/arm/include/asm/mach/dma.h
+ *
+ *  Copyright (C) 1998-2000 Russell King
+ *
+ *  This header file describes the interface between the generic DMA handler
+ *  (dma.c) and the architecture-specific DMA backends (dma-*.c)
+ */
+
+struct dma_struct;
+typedef struct dma_struct dma_t;
+
+struct dma_ops {
+	int	(*request)(unsigned int, dma_t *);		/* optional */
+	void	(*free)(unsigned int, dma_t *);			/* optional */
+	void	(*enable)(unsigned int, dma_t *);		/* mandatory */
+	void 	(*disable)(unsigned int, dma_t *);		/* mandatory */
+	int	(*residue)(unsigned int, dma_t *);		/* optional */
+	int	(*setspeed)(unsigned int, dma_t *, int);	/* optional */
+	const char *type;
+};
+
+struct dma_struct {
+	void		*addr;		/* single DMA address		*/
+	unsigned long	count;		/* single DMA size		*/
+	struct scatterlist buf;		/* single DMA			*/
+	int		sgcount;	/* number of DMA SG		*/
+	struct scatterlist *sg;		/* DMA Scatter-Gather List	*/
+
+	unsigned int	active:1;	/* Transfer active		*/
+	unsigned int	invalid:1;	/* Address/Count changed	*/
+
+	unsigned int	dma_mode;	/* DMA mode			*/
+	int		speed;		/* DMA speed			*/
+
+	unsigned int	lock;		/* Device is allocated		*/
+	const char	*device_id;	/* Device name			*/
+
+	const struct dma_ops *d_ops;
+};
+
+/*
+ * isa_dma_add - add an ISA-style DMA channel
+ */
+extern int isa_dma_add(unsigned int, dma_t *dma);