1 /*
2  * Copyright (C) 2012-2015 Masahiro Yamada <yamada.masahiro@socionext.com>
3  *
4  * SPDX-License-Identifier:	GPL-2.0+
5  */
6 
7 #include <common.h>
8 #include <libfdt.h>
9 #include <fdtdec.h>
10 #include <linux/err.h>
11 
12 DECLARE_GLOBAL_DATA_PTR;
13 
14 static const void *get_memory_reg_prop(const void *fdt, int *lenp)
15 {
16 	int offset;
17 
18 	offset = fdt_path_offset(fdt, "/memory");
19 	if (offset < 0)
20 		return NULL;
21 
22 	return fdt_getprop(fdt, offset, "reg", lenp);
23 }
24 
25 int dram_init(void)
26 {
27 	const void *fdt = gd->fdt_blob;
28 	const fdt32_t *val;
29 	int ac, sc, len;
30 
31 	ac = fdt_address_cells(fdt, 0);
32 	sc = fdt_size_cells(fdt, 0);
33 	if (ac < 0 || sc < 1 || sc > 2) {
34 		printf("invalid address/size cells\n");
35 		return -EINVAL;
36 	}
37 
38 	val = get_memory_reg_prop(fdt, &len);
39 	if (len / sizeof(*val) < ac + sc)
40 		return -EINVAL;
41 
42 	val += ac;
43 
44 	gd->ram_size = fdtdec_get_number(val, sc);
45 
46 	debug("DRAM size = %08lx\n", (unsigned long)gd->ram_size);
47 
48 	return 0;
49 }
50 
51 void dram_init_banksize(void)
52 {
53 	const void *fdt = gd->fdt_blob;
54 	const fdt32_t *val;
55 	int ac, sc, cells, len, i;
56 
57 	val = get_memory_reg_prop(fdt, &len);
58 	if (len < 0)
59 		return;
60 
61 	ac = fdt_address_cells(fdt, 0);
62 	sc = fdt_size_cells(fdt, 0);
63 	if (ac < 1 || sc > 2 || sc < 1 || sc > 2) {
64 		printf("invalid address/size cells\n");
65 		return;
66 	}
67 
68 	cells = ac + sc;
69 
70 	len /= sizeof(*val);
71 
72 	for (i = 0; i < CONFIG_NR_DRAM_BANKS && len >= cells;
73 	     i++, len -= cells) {
74 		gd->bd->bi_dram[i].start = fdtdec_get_number(val, ac);
75 		val += ac;
76 		gd->bd->bi_dram[i].size = fdtdec_get_number(val, sc);
77 		val += sc;
78 
79 		debug("DRAM bank %d: start = %08lx, size = %08lx\n",
80 		      i, (unsigned long)gd->bd->bi_dram[i].start,
81 		      (unsigned long)gd->bd->bi_dram[i].size);
82 	}
83 }
84