target/linux/rb1xx-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_routerboot(void)
 137 {
 138         /* FIXME: not yet implemented */
 139         return 0;
 140 }
 141
 142 static int __init detect_bootloader(void)
 143 {
 144         if (detect_cfe())
 145                 return BOOT_LOADER_CFE;
 146
 147         if (detect_uboot())
 148                 return BOOT_LOADER_UBOOT;
 149
 150         if (detect_myloader())
 151                 return BOOT_LOADER_MYLOADER;
 152
 153         if (detect_routerboot())
 154                 return BOOT_LOADER_ROUTERBOOT;
 155
 156         return BOOT_LOADER_UNKNOWN;
 157 }
 158
 159 /*
 160  * Board detection
 161  */
 162 static void __init detect_board_type(void)
 163 {
 164         /* FIXME: not yet implemented */
 165 }
 166
 167 void __init adm5120_info_show(void)
 168 {
 169         printk("ADM%04X%s revision %d, running at %ldMHz\n",
 170                 adm5120_info.product_code,
 171                 (adm5120_info.cpu_package == CPU_PACKAGE_BGA) ? "" : "P",
 172                 adm5120_info.revision,
 173                 (adm5120_info.cpu_speed / 1000000)
 174                 );
 175         printk("Boot loader is: %s\n", boot_loader_names[adm5120_info.boot_loader]);
 176         printk("Booted from   : %s flash\n", adm5120_info.nand_boot ? "NAND" : "NOR");
 177 }
 178
 179 void __init adm5120_info_init(void)
 180 {
 181         detect_cpu_info();
 182         adm5120_info.boot_loader = detect_bootloader();
 183         detect_board_type();
 184
 185         adm5120_info_show();
 186 }