summaryrefslogtreecommitdiffstats
path: root/arch/powerpc/boot/treeboot-akebono.c
blob: e3cc2599869ccc16be921a114cac6962de48914b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright © 2013 Tony Breeds IBM Corporation
 * Copyright © 2013 Alistair Popple IBM Corporation
 *
 * Based on earlier code:
 *   Copyright (C) Paul Mackerras 1997.
 *
 *   Matt Porter <mporter@kernel.crashing.org>
 *   Copyright 2002-2005 MontaVista Software Inc.
 *
 *   Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
 *   Copyright (c) 2003, 2004 Zultys Technologies
 *
 *    Copyright 2007 David Gibson, IBM Corporation.
 *    Copyright 2010 Ben. Herrenschmidt, IBM Corporation.
 *    Copyright © 2011 David Kleikamp IBM Corporation
 */
#include <stdarg.h>
#include <stddef.h>
#include "types.h"
#include "elf.h"
#include "string.h"
#include "stdlib.h"
#include "stdio.h"
#include "page.h"
#include "ops.h"
#include "reg.h"
#include "io.h"
#include "dcr.h"
#include "4xx.h"
#include "44x.h"
#include "libfdt.h"

BSS_STACK(4096);

#define SPRN_PIR	0x11E	/* Processor Identification Register */
#define USERDATA_LEN	256	/* Length of userdata passed in by PIBS */
#define MAX_RANKS	0x4
#define DDR3_MR0CF	0x80010011U
#define CCTL0_MCO2	0x8000080FU
#define CCTL0_MCO3	0x80000810U
#define CCTL0_MCO4	0x80000811U
#define CCTL0_MCO5	0x80000812U
#define CCTL0_MCO6	0x80000813U

static unsigned long long ibm_akebono_memsize;
static long long unsigned mac_addr;

static unsigned long long ibm_akebono_detect_memsize(void)
{
	u32 reg;
	unsigned i;
	unsigned long long memsize = 0;

	for (i = 0; i < MAX_RANKS; i++) {
		reg = mfdcrx(DDR3_MR0CF + i);

		if (!(reg & 1))
			continue;

		reg &= 0x0000f000;
		reg >>= 12;
		memsize += (0x800000ULL << reg);
	}

	return memsize;
}

static void ibm_akebono_fixups(void)
{
	void *emac;
	u32 reg;

	dt_fixup_memory(0x0ULL,  ibm_akebono_memsize);

	/* Fixup the SD timeout frequency */
	mtdcrx(CCTL0_MCO4, 0x1);

	/* Disable SD high-speed mode (which seems to be broken) */
	reg = mfdcrx(CCTL0_MCO2) & ~0x2;
	mtdcrx(CCTL0_MCO2, reg);

	/* Set the MAC address */
	emac = finddevice("/plb/opb/ethernet");
	if (emac > 0) {
		if (mac_addr)
			setprop(emac, "local-mac-address",
				((u8 *) &mac_addr) + 2 , 6);
	}
}

void platform_init(char *userdata)
{
	unsigned long end_of_ram, avail_ram;
	u32 pir_reg;
	int node, size;
	const u32 *timebase;
	int len, i, userdata_len;
	char *end;

	userdata[USERDATA_LEN - 1] = '\0';
	userdata_len = strlen(userdata);
	for (i = 0; i < userdata_len - 15; i++) {
		if (strncmp(&userdata[i], "local-mac-addr=", 15) == 0) {
			if (i > 0 && userdata[i - 1] != ' ') {
				/* We've only found a substring ending
				 * with local-mac-addr so this isn't
				 * our mac address. */
				continue;
			}

			mac_addr = strtoull(&userdata[i + 15], &end, 16);

			/* Remove the "local-mac-addr=<...>" from the kernel
			 * command line, including the tailing space if
			 * present. */
			if (*end == ' ')
				end++;

			len = ((int) end) - ((int) &userdata[i]);
			memmove(&userdata[i], end,
				userdata_len - (len + i) + 1);
			break;
		}
	}

	loader_info.cmdline = userdata;
	loader_info.cmdline_len = 256;

	ibm_akebono_memsize = ibm_akebono_detect_memsize();
	if (ibm_akebono_memsize >> 32)
		end_of_ram = ~0UL;
	else
		end_of_ram = ibm_akebono_memsize;
	avail_ram = end_of_ram - (unsigned long)_end;

	simple_alloc_init(_end, avail_ram, 128, 64);
	platform_ops.fixups = ibm_akebono_fixups;
	platform_ops.exit = ibm44x_dbcr_reset;
	pir_reg = mfspr(SPRN_PIR);

	/* Make sure FDT blob is sane */
	if (fdt_check_header(_dtb_start) != 0)
		fatal("Invalid device tree blob\n");

	node = fdt_node_offset_by_prop_value(_dtb_start, -1, "device_type",
					     "cpu", sizeof("cpu"));
	if (!node)
		fatal("Cannot find cpu node\n");
	timebase = fdt_getprop(_dtb_start, node, "timebase-frequency", &size);
	if (timebase && (size == 4))
		timebase_period_ns = 1000000000 / *timebase;

	fdt_set_boot_cpuid_phys(_dtb_start, pir_reg);
	fdt_init(_dtb_start);

	serial_console_init();
}