target/linux/adm5120/files-2.6.26/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 u16 bootbase_get_vendor_id(void)
  57 {
  58 #define CHECK_VENDOR(n) (strnicmp(board_info->vendor, (n), strlen(n)) == 0)
  59         unsigned char vendor[ZYNOS_NAME_LEN];
  60         int i;
  61
  62         for (i = 0; i < ZYNOS_NAME_LEN; i++)
  63                 vendor[i] = board_info->vendor[i];
  64
  65         if CHECK_VENDOR(ZYNOS_VENDOR_ZYXEL)
  66                 return ZYNOS_VENDOR_ID_ZYXEL;
  67
  68         if CHECK_VENDOR(ZYNOS_VENDOR_DLINK)
  69                 return ZYNOS_VENDOR_ID_DLINK;
  70
  71         if CHECK_VENDOR(ZYNOS_VENDOR_LUCENT)
  72                 return ZYNOS_VENDOR_ID_LUCENT;
  73
  74         if CHECK_VENDOR(ZYNOS_VENDOR_NETGEAR)
  75                 return ZYNOS_VENDOR_ID_NETGEAR;
  76
  77         return ZYNOS_VENDOR_ID_OTHER;
  78 }
  79
  80 static inline u16 bootbase_get_board_id(void)
  81 {
  82         return prom_read_be16(&board_info->board_id);
  83 }
  84
  85 int __init bootbase_present(void)
  86 {
  87         u32     t;
  88
  89         if (bootbase_found)
  90                 goto out;
  91
  92         /* check presence of the dbgarea */
  93         if (bootbase_dbgarea_present((u8 *)ZYNOS_HDBG_ADDR) == 0)
  94                 goto out;
  95
  96         board_info = (struct zynos_board_info *)(ZYNOS_INFO_ADDR);
  97
  98         /* check for a valid BootExt address */
  99         t = bootbase_get_bootext_addr();
 100         if ((t < BOOTEXT_ADDR_MIN) || (t > BOOTEXT_ADDR_MAX))
 101                 goto out;
 102
 103         bootbase_info.vendor_id = bootbase_get_vendor_id();
 104         bootbase_info.board_id = bootbase_get_board_id();
 105
 106         bootbase_found = 1;
 107
 108 out:
 109         return bootbase_found;
 110 }
 111