1/*
2 * The simple platform -- for booting when firmware doesn't supply a device
3 *                        tree or any platform configuration information.
4 *                        All data is extracted from an embedded device tree
5 *                        blob.
6 *
7 * Authors: Scott Wood <scottwood@freescale.com>
8 *          Grant Likely <grant.likely@secretlab.ca>
9 *
10 * Copyright (c) 2007 Freescale Semiconductor, Inc.
11 * Copyright (c) 2008 Secret Lab Technologies Ltd.
12 *
13 * This program is free software; you can redistribute it and/or modify it
14 * under the terms of the GNU General Public License version 2 as published
15 * by the Free Software Foundation.
16 */
17
18#include "ops.h"
19#include "types.h"
20#include "io.h"
21#include "stdio.h"
22#include <libfdt.h>
23
24BSS_STACK(4*1024);
25
26extern int platform_specific_init(void) __attribute__((weak));
27
28void platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
29		   unsigned long r6, unsigned long r7)
30{
31	const u32 *na, *ns, *reg, *timebase;
32	u64 memsize64;
33	int node, size, i;
34
35	/* Make sure FDT blob is sane */
36	if (fdt_check_header(_dtb_start) != 0)
37		fatal("Invalid device tree blob\n");
38
39	/* Find the #address-cells and #size-cells properties */
40	node = fdt_path_offset(_dtb_start, "/");
41	if (node < 0)
42		fatal("Cannot find root node\n");
43	na = fdt_getprop(_dtb_start, node, "#address-cells", &size);
44	if (!na || (size != 4))
45		fatal("Cannot find #address-cells property");
46	ns = fdt_getprop(_dtb_start, node, "#size-cells", &size);
47	if (!ns || (size != 4))
48		fatal("Cannot find #size-cells property");
49
50	/* Find the memory range */
51	node = fdt_node_offset_by_prop_value(_dtb_start, -1, "device_type",
52					     "memory", sizeof("memory"));
53	if (node < 0)
54		fatal("Cannot find memory node\n");
55	reg = fdt_getprop(_dtb_start, node, "reg", &size);
56	if (size < (*na+*ns) * sizeof(u32))
57		fatal("cannot get memory range\n");
58
59	/* Only interested in memory based at 0 */
60	for (i = 0; i < *na; i++)
61		if (*reg++ != 0)
62			fatal("Memory range is not based at address 0\n");
63
64	/* get the memsize and truncate it to under 4G on 32 bit machines */
65	memsize64 = 0;
66	for (i = 0; i < *ns; i++)
67		memsize64 = (memsize64 << 32) | *reg++;
68	if (sizeof(void *) == 4 && memsize64 >= 0x100000000ULL)
69		memsize64 = 0xffffffff;
70
71	/* finally, setup the timebase */
72	node = fdt_node_offset_by_prop_value(_dtb_start, -1, "device_type",
73					     "cpu", sizeof("cpu"));
74	if (!node)
75		fatal("Cannot find cpu node\n");
76	timebase = fdt_getprop(_dtb_start, node, "timebase-frequency", &size);
77	if (timebase && (size == 4))
78		timebase_period_ns = 1000000000 / *timebase;
79
80	/* Now we have the memory size; initialize the heap */
81	simple_alloc_init(_end, memsize64 - (unsigned long)_end, 32, 64);
82
83	/* prepare the device tree and find the console */
84	fdt_init(_dtb_start);
85
86	if (platform_specific_init)
87		platform_specific_init();
88
89	serial_console_init();
90}
91