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      1 /*	$NetBSD: fdt_addresses.c,v 1.1.1.3 2019/12/22 12:30:37 skrll Exp $	*/
      2 
      3 // SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause)
      4 /*
      5  * libfdt - Flat Device Tree manipulation
      6  * Copyright (C) 2014 David Gibson <david (at) gibson.dropbear.id.au>
      7  * Copyright (C) 2018 embedded brains GmbH
      8  */
      9 #include "libfdt_env.h"
     10 
     11 #include <fdt.h>
     12 #include <libfdt.h>
     13 
     14 #include "libfdt_internal.h"
     15 
     16 static int fdt_cells(const void *fdt, int nodeoffset, const char *name)
     17 {
     18 	const fdt32_t *c;
     19 	uint32_t val;
     20 	int len;
     21 
     22 	c = fdt_getprop(fdt, nodeoffset, name, &len);
     23 	if (!c)
     24 		return len;
     25 
     26 	if (len != sizeof(*c))
     27 		return -FDT_ERR_BADNCELLS;
     28 
     29 	val = fdt32_to_cpu(*c);
     30 	if (val > FDT_MAX_NCELLS)
     31 		return -FDT_ERR_BADNCELLS;
     32 
     33 	return (int)val;
     34 }
     35 
     36 int fdt_address_cells(const void *fdt, int nodeoffset)
     37 {
     38 	int val;
     39 
     40 	val = fdt_cells(fdt, nodeoffset, "#address-cells");
     41 	if (val == 0)
     42 		return -FDT_ERR_BADNCELLS;
     43 	if (val == -FDT_ERR_NOTFOUND)
     44 		return 2;
     45 	return val;
     46 }
     47 
     48 int fdt_size_cells(const void *fdt, int nodeoffset)
     49 {
     50 	int val;
     51 
     52 	val = fdt_cells(fdt, nodeoffset, "#size-cells");
     53 	if (val == -FDT_ERR_NOTFOUND)
     54 		return 1;
     55 	return val;
     56 }
     57 
     58 /* This function assumes that [address|size]_cells is 1 or 2 */
     59 int fdt_appendprop_addrrange(void *fdt, int parent, int nodeoffset,
     60 			     const char *name, uint64_t addr, uint64_t size)
     61 {
     62 	int addr_cells, size_cells, ret;
     63 	uint8_t data[sizeof(fdt64_t) * 2], *prop;
     64 
     65 	ret = fdt_address_cells(fdt, parent);
     66 	if (ret < 0)
     67 		return ret;
     68 	addr_cells = ret;
     69 
     70 	ret = fdt_size_cells(fdt, parent);
     71 	if (ret < 0)
     72 		return ret;
     73 	size_cells = ret;
     74 
     75 	/* check validity of address */
     76 	prop = data;
     77 	if (addr_cells == 1) {
     78 		if ((addr > UINT32_MAX) || ((UINT32_MAX + 1 - addr) < size))
     79 			return -FDT_ERR_BADVALUE;
     80 
     81 		fdt32_st(prop, (uint32_t)addr);
     82 	} else if (addr_cells == 2) {
     83 		fdt64_st(prop, addr);
     84 	} else {
     85 		return -FDT_ERR_BADNCELLS;
     86 	}
     87 
     88 	/* check validity of size */
     89 	prop += addr_cells * sizeof(fdt32_t);
     90 	if (size_cells == 1) {
     91 		if (size > UINT32_MAX)
     92 			return -FDT_ERR_BADVALUE;
     93 
     94 		fdt32_st(prop, (uint32_t)size);
     95 	} else if (size_cells == 2) {
     96 		fdt64_st(prop, size);
     97 	} else {
     98 		return -FDT_ERR_BADNCELLS;
     99 	}
    100 
    101 	return fdt_appendprop(fdt, nodeoffset, name, data,
    102 			      (addr_cells + size_cells) * sizeof(fdt32_t));
    103 }
    104