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         [BOOT_LOADER_ROUTERBOOT]= "RouterBOOT"
  42 };
  43
  44 /*
  45  * CPU settings detection
  46  */
  47 #define CODE_GET_PC(c)          ((c) & CODE_PC_MASK)
  48 #define CODE_GET_REV(c)         (((c) >> CODE_REV_SHIFT) & CODE_REV_MASK)
  49 #define CODE_GET_PK(c)          (((c) >> CODE_PK_SHIFT) & CODE_PK_MASK)
  50 #define CODE_GET_CLKS(c)        (((c) >> CODE_CLKS_SHIFT) & CODE_CLKS_MASK)
  51 #define CODE_GET_NAB(c)         (((c) & CODE_NAB) != 0)
  52
  53 static void __init detect_cpu_info(void)
  54 {
  55         uint32_t *reg;
  56         uint32_t code;
  57         uint32_t clks;
  58
  59         reg = (uint32_t *)KSEG1ADDR(ADM5120_SWITCH_BASE+SWITCH_REG_CODE);
  60         code = *reg;
  61
  62         clks = CODE_GET_CLKS(code);
  63
  64         adm5120_info.product_code = CODE_GET_PC(code);
  65         adm5120_info.revision = CODE_GET_REV(code);
  66
  67         adm5120_info.cpu_speed = CPU_SPEED_175;
  68         if (clks & 1)
  69                 adm5120_info.cpu_speed += 25000000;
  70         if (clks & 2)
  71                 adm5120_info.cpu_speed += 50000000;
  72
  73         adm5120_info.cpu_package = (CODE_GET_PK(code) == CODE_PK_BGA) ?
  74                 CPU_PACKAGE_BGA : CPU_PACKAGE_PQFP;
  75
  76         adm5120_info.nand_boot = CODE_GET_NAB(code);
  77
  78 }
  79
  80 /*
  81  * Boot loader detection routines
  82  */
  83 static int __init detect_cfe(void)
  84 {
  85         /*
  86          * This method only works, when we are booted directly from the CFE.
  87          */
  88         uint32_t cfe_handle = (uint32_t) fw_arg0;
  89         uint32_t cfe_a1_val = (uint32_t) fw_arg1;
  90         uint32_t cfe_entry = (uint32_t) fw_arg2;
  91         uint32_t cfe_seal = (uint32_t) fw_arg3;
  92
  93         /* Check for CFE by finding the CFE magic number */
  94         if (cfe_seal != CFE_EPTSEAL) {
  95                 /* We are not booted from CFE */
  96                 return 0;
  97         }
  98
  99         /* cfe_a1_val must be 0, because only one CPU present in the ADM5120 SoC */
 100         if (cfe_a1_val != 0) {
 101                 return 0;
 102         }
 103
 104         /* The cfe_handle, and the cfe_entry must be kernel mode addresses */
 105         if ((cfe_handle < KSEG0) || (cfe_entry < KSEG0)) {
 106                 return 0;
 107         }
 108
 109         return 1;
 110 }
 111
 112 static int __init detect_uboot(void)
 113 {
 114         /* FIXME: not yet implemented */
 115         return 0;
 116 }
 117
 118 static int __init detect_myloader(void)
 119 {
 120         struct mylo_system_params *sysp;
 121         struct mylo_board_params *boardp;
 122         struct mylo_partition_table *parts;
 123
 124         sysp = (struct mylo_system_params *)(MYLO_MIPS_SYS_PARAMS);
 125         boardp = (struct mylo_board_params *)(MYLO_MIPS_BOARD_PARAMS);
 126         parts = (struct mylo_partition_table *)(MYLO_MIPS_PARTITIONS);
 127
 128         /* Check for some magic numbers */
 129         if ((sysp->magic != MYLO_MAGIC_SYS_PARAMS) ||
 130            (boardp->magic != MYLO_MAGIC_BOARD_PARAMS) ||
 131            (parts->magic != MYLO_MAGIC_PARTITIONS))
 132                 return 0;
 133
 134         return 1;
 135 }
 136
 137 static int __init detect_routerboot(void)
 138 {
 139         /* FIXME: not yet implemented */
 140         return 0;
 141 }
 142
 143 static int __init detect_bootloader(void)
 144 {
 145         if (detect_cfe())
 146                 return BOOT_LOADER_CFE;
 147
 148         if (detect_uboot())
 149                 return BOOT_LOADER_UBOOT;
 150
 151         if (detect_myloader())
 152                 return BOOT_LOADER_MYLOADER;
 153
 154         if (detect_routerboot())
 155                 return BOOT_LOADER_ROUTERBOOT;
 156
 157         return BOOT_LOADER_UNKNOWN;
 158 }
 159
 160 /*
 161  * Board detection
 162  */
 163 static void __init detect_board_type(void)
 164 {
 165         /* FIXME: not yet implemented */
 166 }
 167
 168 void __init adm5120_info_show(void)
 169 {
 170         printk("ADM%04X%s revision %d, running at %ldMHz\n",
 171                 adm5120_info.product_code,
 172                 (adm5120_info.cpu_package == CPU_PACKAGE_BGA) ? "" : "P",
 173                 adm5120_info.revision,
 174                 (adm5120_info.cpu_speed / 1000000)
 175                 );
 176         printk("Boot loader is: %s\n", boot_loader_names[adm5120_info.boot_loader]);
 177         printk("Booted from   : %s flash\n", adm5120_info.nand_boot ? "NAND" : "NOR");
 178 }
 179
 180 void __init adm5120_info_init(void)
 181 {
 182         detect_cpu_info();
 183         adm5120_info.boot_loader = detect_bootloader();
 184         detect_board_type();
 185
 186         adm5120_info_show();
 187 }