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
35 BSS_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
47 static unsigned long long ibm_akebono_memsize;
48 static long long unsigned mac_addr;
49
50 static 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
70 static 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
93 void 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
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.