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-rw-r--r--include/dma.h86
1 files changed, 86 insertions, 0 deletions
diff --git a/include/dma.h b/include/dma.h
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+/*
+ * (C) Copyright 2015
+ * Texas Instruments Incorporated, <www.ti.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#ifndef _DMA_H_
+#define _DMA_H_
+
+/*
+ * enum dma_direction - dma transfer direction indicator
+ * @DMA_MEM_TO_MEM: Memcpy mode
+ * @DMA_MEM_TO_DEV: From Memory to Device
+ * @DMA_DEV_TO_MEM: From Device to Memory
+ * @DMA_DEV_TO_DEV: From Device to Device
+ */
+enum dma_direction {
+ DMA_MEM_TO_MEM,
+ DMA_MEM_TO_DEV,
+ DMA_DEV_TO_MEM,
+ DMA_DEV_TO_DEV,
+};
+
+#define DMA_SUPPORTS_MEM_TO_MEM BIT(0)
+#define DMA_SUPPORTS_MEM_TO_DEV BIT(1)
+#define DMA_SUPPORTS_DEV_TO_MEM BIT(2)
+#define DMA_SUPPORTS_DEV_TO_DEV BIT(3)
+
+/*
+ * struct dma_ops - Driver model DMA operations
+ *
+ * The uclass interface is implemented by all DMA devices which use
+ * driver model.
+ */
+struct dma_ops {
+ /*
+ * Get the current timer count
+ *
+ * @dev: The DMA device
+ * @direction: direction of data transfer should be one from
+ enum dma_direction
+ * @dst: Destination pointer
+ * @src: Source pointer
+ * @len: Length of the data to be copied.
+ * @return: 0 if OK, -ve on error
+ */
+ int (*transfer)(struct udevice *dev, int direction, void *dst,
+ void *src, size_t len);
+};
+
+/*
+ * struct dma_dev_priv - information about a device used by the uclass
+ *
+ * @supported: mode of transfers that DMA can support, should be
+ * one/multiple of DMA_SUPPORTS_*
+ */
+struct dma_dev_priv {
+ u32 supported;
+};
+
+/*
+ * dma_get_device - get a DMA device which supports transfer
+ * type of transfer_type
+ *
+ * @transfer_type - transfer type should be one/multiple of
+ * DMA_SUPPORTS_*
+ * @devp - udevice pointer to return the found device
+ * @return - will return on success and devp will hold the
+ * pointer to the device
+ */
+int dma_get_device(u32 transfer_type, struct udevice **devp);
+
+/*
+ * dma_memcpy - try to use DMA to do a mem copy which will be
+ * much faster than CPU mem copy
+ *
+ * @dst - destination pointer
+ * @src - souce pointer
+ * @len - data length to be copied
+ * @return - on successful transfer returns no of bytes
+ transferred and on failure return error code.
+ */
+int dma_memcpy(void *dst, void *src, size_t len);
+
+#endif /* _DMA_H_ */