// SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause)
/*
 * libfdt - Flat Device Tree manipulation
 * Copyright (C) 2014 David Gibson <david@gibson.dropbear.id.au>
 * Copyright (C) 2018 embedded brains GmbH
 */
#include "libfdt_env.h"

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

#include "libfdt_internal.h"

static int fdt_cells(const void *fdt, int nodeoffset, const char *name)
{
        const fdt32_t *c;
        uint32_t val;
        int len;

        c = fdt_getprop(fdt, nodeoffset, name, &len);
        if (!c)
                return len;

        if (len != sizeof(*c))
                return -FDT_ERR_BADNCELLS;

        val = fdt32_to_cpu(*c);
        if (val > FDT_MAX_NCELLS)
                return -FDT_ERR_BADNCELLS;

        return (int)val;
}

int fdt_address_cells(const void *fdt, int nodeoffset)
{
        int val;

        val = fdt_cells(fdt, nodeoffset, "#address-cells");
        if (val == 0)
                return -FDT_ERR_BADNCELLS;
        if (val == -FDT_ERR_NOTFOUND)
                return 2;
        return val;
}

int fdt_size_cells(const void *fdt, int nodeoffset)
{
        int val;

        val = fdt_cells(fdt, nodeoffset, "#size-cells");
        if (val == -FDT_ERR_NOTFOUND)
                return 1;
        return val;
}

/* This function assumes that [address|size]_cells is 1 or 2 */
int fdt_appendprop_addrrange(void *fdt, int parent, int nodeoffset,
                             const char *name, uint64_t addr, uint64_t size)
{
        int addr_cells, size_cells, ret;
        uint8_t data[sizeof(fdt64_t) * 2], *prop;

        ret = fdt_address_cells(fdt, parent);
        if (ret < 0)
                return ret;
        addr_cells = ret;

        ret = fdt_size_cells(fdt, parent);
        if (ret < 0)
                return ret;
        size_cells = ret;

        /* check validity of address */
        prop = data;
        if (addr_cells == 1) {
                if ((addr > UINT32_MAX) || (((uint64_t) UINT32_MAX + 1 - addr) < size))
                        return -FDT_ERR_BADVALUE;

                fdt32_st(prop, (uint32_t)addr);
        } else if (addr_cells == 2) {
                fdt64_st(prop, addr);
        } else {
                return -FDT_ERR_BADNCELLS;
        }

        /* check validity of size */
        prop += addr_cells * sizeof(fdt32_t);
        if (size_cells == 1) {
                if (size > UINT32_MAX)
                        return -FDT_ERR_BADVALUE;

                fdt32_st(prop, (uint32_t)size);
        } else if (size_cells == 2) {
                fdt64_st(prop, size);
        } else {
                return -FDT_ERR_BADNCELLS;
        }

        return fdt_appendprop(fdt, nodeoffset, name, data,
                              (addr_cells + size_cells) * sizeof(fdt32_t));
}