Add definitions, add settings detection for SoCs
[openwrt/svn-archive/archive.git] / target / linux / adm5120-2.6 / files / arch / mips / adm5120 / adm5120_info.c
1 /*
2 * $Id$
3 *
4 * Copyright (C) 2007 OpenWrt.org
5 * Copyright (C) 2007 Gabor Juhos <juhosg@freemail.hu>
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation; either version 2 of the License, or (at your
10 * option) any later version.
11 */
12
13 #include <linux/types.h>
14 #include <linux/autoconf.h>
15 #include <linux/kernel.h>
16 #include <linux/init.h>
17
18 #include <asm/bootinfo.h>
19 #include <asm/addrspace.h>
20
21 #include <adm5120_info.h>
22 #include <adm5120_defs.h>
23 #include <adm5120_switch.h>
24 #include <myloader.h>
25
26 /* boot loaders specific definitions */
27 #define CFE_EPTSEAL 0x43464531 /* CFE1 is the magic number to recognize CFE from other bootloaders */
28
29 struct adm5120_info adm5120_info = {
30 .cpu_speed = CPU_SPEED_175,
31 .cpu_package = CPU_PACKAGE_PQFP,
32 .boot_loader = BOOT_LOADER_UNKNOWN,
33 .board_type = BOARD_TYPE_UNKNOWN
34 };
35
36 static char *boot_loader_names[BOOT_LOADER_LAST+1] = {
37 [BOOT_LOADER_UNKNOWN] = "Unknown",
38 [BOOT_LOADER_CFE] = "CFE",
39 [BOOT_LOADER_UBOOT] = "U-Boot",
40 [BOOT_LOADER_MYLOADER] = "MyLoader"
41 };
42
43 /*
44 * CPU settings detection
45 */
46 #define CODE_GET_PC(c) ((c) & CODE_PC_MASK)
47 #define CODE_GET_REV(c) (((c) >> CODE_REV_SHIFT) & CODE_REV_MASK)
48 #define CODE_GET_PK(c) (((c) >> CODE_PK_SHIFT) & CODE_PK_MASK)
49 #define CODE_GET_CLKS(c) (((c) >> CODE_CLKS_SHIFT) & CODE_CLKS_MASK)
50 #define CODE_GET_NAB(c) (((c) & CODE_NAB) != 0)
51
52 static void __init detect_cpu_info(void)
53 {
54 uint32_t *reg;
55 uint32_t code;
56 uint32_t clks;
57
58 reg = (uint32_t *)KSEG1ADDR(ADM5120_SWITCH_BASE+SWITCH_REG_CODE);
59 code = *reg;
60
61 clks = CODE_GET_CLKS(code);
62
63 adm5120_info.product_code = CODE_GET_PC(code);
64 adm5120_info.revision = CODE_GET_REV(code);
65
66 adm5120_info.cpu_speed = CPU_SPEED_175;
67 if (clks & 1)
68 adm5120_info.cpu_speed += 25000000;
69 if (clks & 2)
70 adm5120_info.cpu_speed += 50000000;
71
72 adm5120_info.cpu_package = (CODE_GET_PK(code) == CODE_PK_BGA) ?
73 CPU_PACKAGE_BGA : CPU_PACKAGE_PQFP;
74
75 adm5120_info.nand_boot = CODE_GET_NAB(code);
76
77 }
78
79 /*
80 * Boot loader detection routines
81 */
82 static int __init detect_cfe(void)
83 {
84 /*
85 * This method only works, when we are booted directly from the CFE.
86 */
87 uint32_t cfe_handle = (uint32_t) fw_arg0;
88 uint32_t cfe_a1_val = (uint32_t) fw_arg1;
89 uint32_t cfe_entry = (uint32_t) fw_arg2;
90 uint32_t cfe_seal = (uint32_t) fw_arg3;
91
92 /* Check for CFE by finding the CFE magic number */
93 if (cfe_seal != CFE_EPTSEAL) {
94 /* We are not booted from CFE */
95 return 0;
96 }
97
98 /* cfe_a1_val must be 0, because only one CPU present in the ADM5120 SoC */
99 if (cfe_a1_val != 0) {
100 return 0;
101 }
102
103 /* The cfe_handle, and the cfe_entry must be kernel mode addresses */
104 if ((cfe_handle < KSEG0) || (cfe_entry < KSEG0)) {
105 return 0;
106 }
107
108 return 1;
109 }
110
111 static int __init detect_uboot(void)
112 {
113 /* FIXME: not yet implemented */
114 return 0;
115 }
116
117 static int __init detect_myloader(void)
118 {
119 struct mylo_system_params *sysp;
120 struct mylo_board_params *boardp;
121 struct mylo_partition_table *parts;
122
123 sysp = (struct mylo_system_params *)(MYLO_MIPS_SYS_PARAMS);
124 boardp = (struct mylo_board_params *)(MYLO_MIPS_BOARD_PARAMS);
125 parts = (struct mylo_partition_table *)(MYLO_MIPS_PARTITIONS);
126
127 /* Check for some magic numbers */
128 if ((sysp->magic != MYLO_MAGIC_SYS_PARAMS) ||
129 (boardp->magic != MYLO_MAGIC_BOARD_PARAMS) ||
130 (parts->magic != MYLO_MAGIC_PARTITIONS))
131 return 0;
132
133 return 1;
134 }
135
136 static int __init detect_bootloader(void)
137 {
138 if (detect_cfe())
139 return BOOT_LOADER_CFE;
140
141 if (detect_uboot())
142 return BOOT_LOADER_UBOOT;
143
144 if (detect_myloader())
145 return BOOT_LOADER_MYLOADER;
146
147 return BOOT_LOADER_UNKNOWN;
148 }
149
150 /*
151 * Board detection
152 */
153 static void __init detect_board_type(void)
154 {
155 /* FIXME: not yet implemented */
156 }
157
158 void __init adm5120_info_show(void)
159 {
160 printk("ADM%04X%s revision %d, running at %ldMHz\n",
161 adm5120_info.product_code,
162 (adm5120_info.cpu_package == CPU_PACKAGE_BGA) ? "" : "P",
163 adm5120_info.revision,
164 (adm5120_info.cpu_speed / 1000000)
165 );
166 printk("Boot loader is: %s\n", boot_loader_names[adm5120_info.boot_loader]);
167 printk("Booted from : %s flash\n", adm5120_info.nand_boot ? "NAND" : "NOR");
168 }
169
170 void __init adm5120_info_init(void)
171 {
172 detect_cpu_info();
173 adm5120_info.boot_loader = detect_bootloader();
174 detect_board_type();
175
176 adm5120_info_show();
177 }