target/linux/adm5120/files-2.6.33/arch/mips/adm5120/prom/bootbase.c

   1 /*
   2  *  ZyXEL's Bootbase specific prom routines
   3  *
   4  *  Copyright (C) 2007-2008 Gabor Juhos <juhosg@openwrt.org>
   5  *
   6  *  This program is free software; you can redistribute it and/or modify it
   7  *  under the terms of the GNU General Public License version 2 as published
   8  *  by the Free Software Foundation.
   9  *
  10  */
  11
  12 #include <linux/types.h>
  13 #include <linux/autoconf.h>
  14 #include <linux/kernel.h>
  15 #include <linux/init.h>
  16 #include <linux/string.h>
  17
  18 #include <asm/bootinfo.h>
  19 #include <asm/addrspace.h>
  20 #include <asm/byteorder.h>
  21
  22 #include <asm/mach-adm5120/adm5120_defs.h>
  23 #include <prom/zynos.h>
  24 #include "prom_read.h"
  25
  26 #define ZYNOS_INFO_ADDR         KSEG1ADDR(ADM5120_SRAM0_BASE+0x3F90)
  27 #define ZYNOS_HDBG_ADDR         KSEG1ADDR(ADM5120_SRAM0_BASE+0x4000)
  28 #define BOOTEXT_ADDR_MIN        KSEG1ADDR(ADM5120_SRAM0_BASE)
  29 #define BOOTEXT_ADDR_MAX        (BOOTEXT_ADDR_MIN + (2*1024*1024))
  30
  31 static int bootbase_found;
  32 static struct zynos_board_info *board_info;
  33
  34 struct bootbase_info bootbase_info;
  35
  36 static inline int bootbase_dbgarea_present(u8 *data)
  37 {
  38         u32 t;
  39
  40         t = prom_read_be32(data+5);
  41         if (t != ZYNOS_MAGIC_DBGAREA1)
  42                 return 0;
  43
  44         t = prom_read_be32(data+9);
  45         if (t != ZYNOS_MAGIC_DBGAREA2)
  46                 return 0;
  47
  48         return 1;
  49 }
  50
  51 static inline u32 bootbase_get_bootext_addr(void)
  52 {
  53         return prom_read_be32(&board_info->bootext_addr);
  54 }
  55
  56 static inline void bootbase_get_mac(u8 *mac)
  57 {
  58         int     i;
  59
  60         for (i = 0; i < 6; i++)
  61                 mac[i] = board_info->mac[i];
  62 }
  63
  64 static inline u16 bootbase_get_vendor_id(void)
  65 {
  66 #define CHECK_VENDOR(n) (strnicmp(board_info->vendor, (n), strlen(n)) == 0)
  67         unsigned char vendor[ZYNOS_NAME_LEN];
  68         int i;
  69
  70         for (i = 0; i < ZYNOS_NAME_LEN; i++)
  71                 vendor[i] = board_info->vendor[i];
  72
  73         if CHECK_VENDOR(ZYNOS_VENDOR_ZYXEL)
  74                 return ZYNOS_VENDOR_ID_ZYXEL;
  75
  76         if CHECK_VENDOR(ZYNOS_VENDOR_DLINK)
  77                 return ZYNOS_VENDOR_ID_DLINK;
  78
  79         if CHECK_VENDOR(ZYNOS_VENDOR_LUCENT)
  80                 return ZYNOS_VENDOR_ID_LUCENT;
  81
  82         if CHECK_VENDOR(ZYNOS_VENDOR_NETGEAR)
  83                 return ZYNOS_VENDOR_ID_NETGEAR;
  84
  85         return ZYNOS_VENDOR_ID_OTHER;
  86 }
  87
  88 static inline u16 bootbase_get_board_id(void)
  89 {
  90         return prom_read_be16(&board_info->board_id);
  91 }
  92
  93 int __init bootbase_present(void)
  94 {
  95         u32     t;
  96
  97         if (bootbase_found)
  98                 goto out;
  99
 100         /* check presence of the dbgarea */
 101         if (bootbase_dbgarea_present((u8 *)ZYNOS_HDBG_ADDR) == 0)
 102                 goto out;
 103
 104         board_info = (struct zynos_board_info *)(ZYNOS_INFO_ADDR);
 105
 106         /* check for a valid BootExt address */
 107         t = bootbase_get_bootext_addr();
 108         if ((t < BOOTEXT_ADDR_MIN) || (t > BOOTEXT_ADDR_MAX))
 109                 goto out;
 110
 111         bootbase_info.vendor_id = bootbase_get_vendor_id();
 112         bootbase_info.board_id = bootbase_get_board_id();
 113         bootbase_get_mac(bootbase_info.mac);
 114
 115         bootbase_found = 1;
 116
 117 out:
 118         return bootbase_found;
 119 }
 120