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/*
* Copyright (c) 2006-2023, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*/
#include "libfdt.h"
#include "dtb_node.h"
/* Max address size we deal with */
#define FDT_MAX_ADDR_CELLS 4
#define FDT_CHECK_ADDR_COUNT(na) ((na) > 0 && (na) <= FDT_MAX_ADDR_CELLS)
#define FDT_CHECK_COUNTS(na, ns) (FDT_CHECK_ADDR_COUNT(na) && (ns) > 0)
static void dtb_node_default_count_cells(const struct dtb_node *dn,
int *addrc, int *sizec)
{
if (addrc)
*addrc = dtb_node_n_addr_cells(dn);
if (sizec)
*sizec = dtb_node_n_size_cells(dn);
}
const uint32_t *dtb_node_get_address(const struct dtb_node *dev, int index,
uint64_t *size, unsigned int *flags)
{
const uint32_t *prop;
int psize;
struct dtb_node *parent;
int onesize, i, na, ns;
/* Get parent */
parent = dtb_node_get_parent(dev);
if (parent == NULL)
return NULL;
dtb_node_default_count_cells(dev, &na, &ns);
if (!FDT_CHECK_ADDR_COUNT(na))
return NULL;
/* Get "reg" or "assigned-addresses" property */
prop = dtb_node_get_dtb_node_property_value(dev, "reg", &psize);
if (prop == NULL)
return NULL;
psize /= 4;
onesize = na + ns;
for (i = 0; psize >= onesize; psize -= onesize, prop += onesize, i++)
if (i == index)
{
if (size)
*size = dtb_node_read_number(prop + na, ns);
if (flags)
*flags = 0x200;
return prop;
}
return NULL;
}
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