1/*
2 * Copyright © 2013 Tony Breeds IBM Corporation
3 * Copyright © 2013 Alistair Popple IBM Corporation
4 *
5 * Based on earlier code:
6 *   Copyright (C) Paul Mackerras 1997.
7 *
8 *   Matt Porter <mporter@kernel.crashing.org>
9 *   Copyright 2002-2005 MontaVista Software Inc.
10 *
11 *   Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
12 *   Copyright (c) 2003, 2004 Zultys Technologies
13 *
14 *    Copyright 2007 David Gibson, IBM Corporation.
15 *    Copyright 2010 Ben. Herrenschmidt, IBM Corporation.
16 *    Copyright © 2011 David Kleikamp IBM Corporation
17 *
18 * This program is free software; you can redistribute it and/or
19 * modify it under the terms of the GNU General Public License
20 * as published by the Free Software Foundation; either version
21 * 2 of the License, or (at your option) any later version.
22 */
23#include <stdarg.h>
24#include <stddef.h>
25#include "types.h"
26#include "elf.h"
27#include "string.h"
28#include "stdlib.h"
29#include "stdio.h"
30#include "page.h"
31#include "ops.h"
32#include "reg.h"
33#include "io.h"
34#include "dcr.h"
35#include "4xx.h"
36#include "44x.h"
37#include "libfdt.h"
38
39BSS_STACK(4096);
40
41#define SPRN_PIR	0x11E	/* Processor Indentification Register */
42#define USERDATA_LEN	256	/* Length of userdata passed in by PIBS */
43#define MAX_RANKS	0x4
44#define DDR3_MR0CF	0x80010011U
45#define CCTL0_MCO2	0x8000080FU
46#define CCTL0_MCO3	0x80000810U
47#define CCTL0_MCO4	0x80000811U
48#define CCTL0_MCO5	0x80000812U
49#define CCTL0_MCO6	0x80000813U
50
51static unsigned long long ibm_akebono_memsize;
52static long long unsigned mac_addr;
53
54static unsigned long long ibm_akebono_detect_memsize(void)
55{
56	u32 reg;
57	unsigned i;
58	unsigned long long memsize = 0;
59
60	for (i = 0; i < MAX_RANKS; i++) {
61		reg = mfdcrx(DDR3_MR0CF + i);
62
63		if (!(reg & 1))
64			continue;
65
66		reg &= 0x0000f000;
67		reg >>= 12;
68		memsize += (0x800000ULL << reg);
69	}
70
71	return memsize;
72}
73
74static void ibm_akebono_fixups(void)
75{
76	void *emac;
77	u32 reg;
78
79	dt_fixup_memory(0x0ULL,  ibm_akebono_memsize);
80
81	/* Fixup the SD timeout frequency */
82	mtdcrx(CCTL0_MCO4, 0x1);
83
84	/* Disable SD high-speed mode (which seems to be broken) */
85	reg = mfdcrx(CCTL0_MCO2) & ~0x2;
86	mtdcrx(CCTL0_MCO2, reg);
87
88	/* Set the MAC address */
89	emac = finddevice("/plb/opb/ethernet");
90	if (emac > 0) {
91		if (mac_addr)
92			setprop(emac, "local-mac-address",
93				((u8 *) &mac_addr) + 2 , 6);
94	}
95}
96
97void platform_init(char *userdata)
98{
99	unsigned long end_of_ram, avail_ram;
100	u32 pir_reg;
101	int node, size;
102	const u32 *timebase;
103	int len, i, userdata_len;
104	char *end;
105
106	userdata[USERDATA_LEN - 1] = '\0';
107	userdata_len = strlen(userdata);
108	for (i = 0; i < userdata_len - 15; i++) {
109		if (strncmp(&userdata[i], "local-mac-addr=", 15) == 0) {
110			if (i > 0 && userdata[i - 1] != ' ') {
111				/* We've only found a substring ending
112				 * with local-mac-addr so this isn't
113				 * our mac address. */
114				continue;
115			}
116
117			mac_addr = strtoull(&userdata[i + 15], &end, 16);
118
119			/* Remove the "local-mac-addr=<...>" from the kernel
120			 * command line, including the tailing space if
121			 * present. */
122			if (*end == ' ')
123				end++;
124
125			len = ((int) end) - ((int) &userdata[i]);
126			memmove(&userdata[i], end,
127				userdata_len - (len + i) + 1);
128			break;
129		}
130	}
131
132	loader_info.cmdline = userdata;
133	loader_info.cmdline_len = 256;
134
135	ibm_akebono_memsize = ibm_akebono_detect_memsize();
136	if (ibm_akebono_memsize >> 32)
137		end_of_ram = ~0UL;
138	else
139		end_of_ram = ibm_akebono_memsize;
140	avail_ram = end_of_ram - (unsigned long)_end;
141
142	simple_alloc_init(_end, avail_ram, 128, 64);
143	platform_ops.fixups = ibm_akebono_fixups;
144	platform_ops.exit = ibm44x_dbcr_reset;
145	pir_reg = mfspr(SPRN_PIR);
146
147	/* Make sure FDT blob is sane */
148	if (fdt_check_header(_dtb_start) != 0)
149		fatal("Invalid device tree blob\n");
150
151	node = fdt_node_offset_by_prop_value(_dtb_start, -1, "device_type",
152					     "cpu", sizeof("cpu"));
153	if (!node)
154		fatal("Cannot find cpu node\n");
155	timebase = fdt_getprop(_dtb_start, node, "timebase-frequency", &size);
156	if (timebase && (size == 4))
157		timebase_period_ns = 1000000000 / *timebase;
158
159	fdt_set_boot_cpuid_phys(_dtb_start, pir_reg);
160	fdt_init(_dtb_start);
161
162	serial_console_init();
163}
164