GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

source/bootloader/u-boot-2020.01/include/dm/of_addr.h

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+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Taken from Linux v4.9 drivers/of/address.c
+ *
+ * Modified for U-Boot
+ * Copyright (c) 2017 Google, Inc
+ */
+
+#ifndef _DM_OF_ADDR_H
+#define _DM_OF_ADDR_H
+
+/**
+ * of_translate_address() - translate a device-tree address to a CPU address
+ *
+ * Translate an address from the device-tree into a CPU physical address,
+ * this walks up the tree and applies the various bus mappings on the  way.
+ *
+ * Note: We consider that crossing any level with #size-cells == 0 to mean
+ * that translation is impossible (that is we are not dealing with a value
+ * that can be mapped to a cpu physical address). This is not really specified
+ * that way, but this is traditionally the way IBM at least do things
+ *
+ * @np: node to check
+ * @in_addr: pointer to input address
+ * @return translated address or OF_BAD_ADDR on error
+ */
+u64 of_translate_address(const struct device_node *no, const __be32 *in_addr);
+
+/**
+ * of_translate_dma_address() - translate a device-tree DMA address to a CPU
+ *				address
+ *
+ * Translate a DMA address from the device-tree into a CPU physical address,
+ * this walks up the tree and applies the various bus mappings on the way.
+ *
+ * Note: We consider that crossing any level with #size-cells == 0 to mean
+ * that translation is impossible (that is we are not dealing with a value
+ * that can be mapped to a cpu physical address). This is not really specified
+ * that way, but this is traditionally the way IBM at least do things
+ *
+ * @np: node to check
+ * @in_addr: pointer to input DMA address
+ * @return translated DMA address or OF_BAD_ADDR on error
+ */
+u64 of_translate_dma_address(const struct device_node *no, const __be32 *in_addr);
+
+/**
+ * of_get_address() - obtain an address from a node
+ *
+ * Extract an address from a node, returns the region size and the address
+ * space flags too. The PCI version uses a BAR number instead of an absolute
+ * index.
+ *
+ * @np: Node to check
+ * @index: Index of address to read (0 = first)
+ * @size: place to put size on success
+ * @flags: place to put flags on success
+ * @return pointer to address which can be read
+ */
+const __be32 *of_get_address(const struct device_node *no, int index,
+			     u64 *size, unsigned int *flags);
+
+struct resource;
+
+/**
+ * of_address_to_resource() - translate device tree address to resource
+ *
+ * Note that if your address is a PIO address, the conversion will fail if
+ * the physical address can't be internally converted to an IO token with
+ * pci_address_to_pio(), that is because it's either called to early or it
+ * can't be matched to any host bridge IO space
+ *
+ * @np: node to check
+ * @index: index of address to read (0 = first)
+ * @r: place to put resource information
+ * @return 0 if OK, -ve on error
+ */
+int of_address_to_resource(const struct device_node *no, int index,
+			   struct resource *r);
+
+#endif