1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright �� 2013 Tony Breeds IBM Corporation
4 * Copyright �� 2013 Alistair Popple IBM Corporation
5 *
6 * Based on earlier code:
7 *   Copyright (C) Paul Mackerras 1997.
8 *
9 *   Matt Porter <mporter@kernel.crashing.org>
10 *   Copyright 2002-2005 MontaVista Software Inc.
11 *
12 *   Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
13 *   Copyright (c) 2003, 2004 Zultys Technologies
14 *
15 *    Copyright 2007 David Gibson, IBM Corporation.
16 *    Copyright 2010 Ben. Herrenschmidt, IBM Corporation.
17 *    Copyright �� 2011 David Kleikamp IBM Corporation
18 */
19#include <stdarg.h>
20#include <stddef.h>
21#include "types.h"
22#include "elf.h"
23#include "string.h"
24#include "stdlib.h"
25#include "stdio.h"
26#include "page.h"
27#include "ops.h"
28#include "reg.h"
29#include "io.h"
30#include "dcr.h"
31#include "4xx.h"
32#include "44x.h"
33#include "libfdt.h"
34
35BSS_STACK(4096);
36
37#define SPRN_PIR	0x11E	/* Processor Identification Register */
38#define USERDATA_LEN	256	/* Length of userdata passed in by PIBS */
39#define MAX_RANKS	0x4
40#define DDR3_MR0CF	0x80010011U
41#define CCTL0_MCO2	0x8000080FU
42#define CCTL0_MCO3	0x80000810U
43#define CCTL0_MCO4	0x80000811U
44#define CCTL0_MCO5	0x80000812U
45#define CCTL0_MCO6	0x80000813U
46
47static unsigned long long ibm_akebono_memsize;
48static long long unsigned mac_addr;
49
50static unsigned long long ibm_akebono_detect_memsize(void)
51{
52	u32 reg;
53	unsigned i;
54	unsigned long long memsize = 0;
55
56	for (i = 0; i < MAX_RANKS; i++) {
57		reg = mfdcrx(DDR3_MR0CF + i);
58
59		if (!(reg & 1))
60			continue;
61
62		reg &= 0x0000f000;
63		reg >>= 12;
64		memsize += (0x800000ULL << reg);
65	}
66
67	return memsize;
68}
69
70static void ibm_akebono_fixups(void)
71{
72	void *emac;
73	u32 reg;
74
75	dt_fixup_memory(0x0ULL,  ibm_akebono_memsize);
76
77	/* Fixup the SD timeout frequency */
78	mtdcrx(CCTL0_MCO4, 0x1);
79
80	/* Disable SD high-speed mode (which seems to be broken) */
81	reg = mfdcrx(CCTL0_MCO2) & ~0x2;
82	mtdcrx(CCTL0_MCO2, reg);
83
84	/* Set the MAC address */
85	emac = finddevice("/plb/opb/ethernet");
86	if (emac > 0) {
87		if (mac_addr)
88			setprop(emac, "local-mac-address",
89				((u8 *) &mac_addr) + 2 , 6);
90	}
91}
92
93void platform_init(char *userdata)
94{
95	unsigned long end_of_ram, avail_ram;
96	u32 pir_reg;
97	int node, size;
98	const u32 *timebase;
99	int len, i, userdata_len;
100	char *end;
101
102	userdata[USERDATA_LEN - 1] = '\0';
103	userdata_len = strlen(userdata);
104	for (i = 0; i < userdata_len - 15; i++) {
105		if (strncmp(&userdata[i], "local-mac-addr=", 15) == 0) {
106			if (i > 0 && userdata[i - 1] != ' ') {
107				/* We've only found a substring ending
108				 * with local-mac-addr so this isn't
109				 * our mac address. */
110				continue;
111			}
112
113			mac_addr = strtoull(&userdata[i + 15], &end, 16);
114
115			/* Remove the "local-mac-addr=<...>" from the kernel
116			 * command line, including the tailing space if
117			 * present. */
118			if (*end == ' ')
119				end++;
120
121			len = ((int) end) - ((int) &userdata[i]);
122			memmove(&userdata[i], end,
123				userdata_len - (len + i) + 1);
124			break;
125		}
126	}
127
128	loader_info.cmdline = userdata;
129	loader_info.cmdline_len = 256;
130
131	ibm_akebono_memsize = ibm_akebono_detect_memsize();
132	if (ibm_akebono_memsize >> 32)
133		end_of_ram = ~0UL;
134	else
135		end_of_ram = ibm_akebono_memsize;
136	avail_ram = end_of_ram - (unsigned long)_end;
137
138	simple_alloc_init(_end, avail_ram, 128, 64);
139	platform_ops.fixups = ibm_akebono_fixups;
140	platform_ops.exit = ibm44x_dbcr_reset;
141	pir_reg = mfspr(SPRN_PIR);
142
143	/* Make sure FDT blob is sane */
144	if (fdt_check_header(_dtb_start) != 0)
145		fatal("Invalid device tree blob\n");
146
147	node = fdt_node_offset_by_prop_value(_dtb_start, -1, "device_type",
148					     "cpu", sizeof("cpu"));
149	if (!node)
150		fatal("Cannot find cpu node\n");
151	timebase = fdt_getprop(_dtb_start, node, "timebase-frequency", &size);
152	if (timebase && (size == 4))
153		timebase_period_ns = 1000000000 / *timebase;
154
155	fdt_set_boot_cpuid_phys(_dtb_start, pir_reg);
156	fdt_init(_dtb_start);
157
158	serial_console_init();
159}
160