rt-thread/components/drivers/ofw/libfdt/fdt_wip.c

// SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause)
/*
 * libfdt - Flat Device Tree manipulation
 * Copyright (C) 2006 David Gibson, IBM Corporation.
 */
#include "libfdt_env.h"

#include <fdt.h>
#include <libfdt.h>

#include "libfdt_internal.h"

int fdt_setprop_inplace_namelen_partial(void *fdt, int nodeoffset,
                    const char *name, int namelen,
                    uint32_t idx, const void *val,
                    int len)
{
    void *propval;
    int proplen;

    propval = fdt_getprop_namelen_w(fdt, nodeoffset, name, namelen,
                    &proplen);
    if (!propval)
        return proplen;

    if ((unsigned)proplen < (len + idx))
        return -FDT_ERR_NOSPACE;

    memcpy((char *)propval + idx, val, len);
    return 0;
}

int fdt_setprop_inplace(void *fdt, int nodeoffset, const char *name,
            const void *val, int len)
{
    const void *propval;
    int proplen;

    propval = fdt_getprop(fdt, nodeoffset, name, &proplen);
    if (!propval)
        return proplen;

    if (proplen != len)
        return -FDT_ERR_NOSPACE;

    return fdt_setprop_inplace_namelen_partial(fdt, nodeoffset, name,
                           strlen(name), 0,
                           val, len);
}

static void fdt_nop_region_(void *start, int len)
{
    fdt32_t *p;

    for (p = start; (char *)p < ((char *)start + len); p++)
        *p = cpu_to_fdt32(FDT_NOP);
}

int fdt_nop_property(void *fdt, int nodeoffset, const char *name)
{
    struct fdt_property *prop;
    int len;

    prop = fdt_get_property_w(fdt, nodeoffset, name, &len);
    if (!prop)
        return len;

    fdt_nop_region_(prop, len + sizeof(*prop));

    return 0;
}

int fdt_node_end_offset_(void *fdt, int offset)
{
    int depth = 0;

    while ((offset >= 0) && (depth >= 0))
        offset = fdt_next_node(fdt, offset, &depth);

    return offset;
}

int fdt_nop_node(void *fdt, int nodeoffset)
{
    int endoffset;

    endoffset = fdt_node_end_offset_(fdt, nodeoffset);
    if (endoffset < 0)
        return endoffset;

    fdt_nop_region_(fdt_offset_ptr_w(fdt, nodeoffset, 0),
            endoffset - nodeoffset);
    return 0;
}