linux/drivers/of/fdt_address.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * FDT Address translation based on u-boot fdt_support.c which in turn was
 * based on the kernel unflattened DT address translation code.
 *
 * (C) Copyright 2007
 * Gerald Van Baren, Custom IDEAS, [email protected]
 *
 * Copyright 2010-2011 Freescale Semiconductor, Inc.
 */

#define pr_fmt(fmt) …

#include <linux/kernel.h>
#include <linux/libfdt.h>
#include <linux/of.h>
#include <linux/of_fdt.h>
#include <linux/sizes.h>

/* Max address size we deal with */
#define OF_MAX_ADDR_CELLS …
#define OF_CHECK_COUNTS(na, ns) …

/* Debug utility */
#ifdef DEBUG
static void __init of_dump_addr(const char *s, const __be32 *addr, int na)
{
	pr_debug("%s", s);
	while(na--)
		pr_cont(" %08x", *(addr++));
	pr_cont("\n");
}
#else
static void __init of_dump_addr(const char *s, const __be32 *addr, int na) { … }
#endif

/* Callbacks for bus specific translators */
struct of_bus { … };

/* Default translator (generic bus) */
static void __init fdt_bus_default_count_cells(const void *blob, int parentoffset,
					       int *addrc, int *sizec)
{ … }

static u64 __init fdt_bus_default_map(__be32 *addr, const __be32 *range,
				      int na, int ns, int pna)
{ … }

static int __init fdt_bus_default_translate(__be32 *addr, u64 offset, int na)
{ … }

/* Array of bus specific translators */
static const struct of_bus of_busses[] __initconst = …;

static int __init fdt_translate_one(const void *blob, int parent,
				    const struct of_bus *bus,
				    const struct of_bus *pbus, __be32 *addr,
				    int na, int ns, int pna, const char *rprop)
{ … }

/*
 * 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
 */
static u64 __init fdt_translate_address(const void *blob, int node_offset)
{ … }

/**
 * of_flat_dt_translate_address - translate DT addr into CPU phys addr
 * @node: node in the flat blob
 */
u64 __init of_flat_dt_translate_address(unsigned long node)
{ … }