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

   1 /*
   2  *  $Id$
   3  *
   4  *  ZyXEL's Bootbase specific prom routines
   5  *
   6  *  Copyright (C) 2007 OpenWrt.org
   7  *  Copyright (C) 2007 Gabor Juhos <juhosg at openwrt.org>
   8  *
   9  *  This program is free software; you can redistribute it and/or
  10  *  modify it under the terms of the GNU General Public License
  11  *  as published by the Free Software Foundation; either version 2
  12  *  of the License, or (at your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful,
  15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *  GNU General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License
  20  *  along with this program; if not, write to the
  21  *  Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  22  *  Boston, MA  02110-1301, USA.
  23  */
  24
  25 #include <linux/types.h>
  26 #include <linux/autoconf.h>
  27 #include <linux/kernel.h>
  28 #include <linux/init.h>
  29 #include <linux/string.h>
  30
  31 #include <asm/bootinfo.h>
  32 #include <asm/addrspace.h>
  33 #include <asm/byteorder.h>
  34
  35 #include <adm5120_defs.h>
  36 #include <prom/zynos.h>
  37 #include "prom_read.h"
  38
  39 #define ZYNOS_INFO_ADDR         KSEG1ADDR(ADM5120_SRAM0_BASE+0x3F90)
  40 #define ZYNOS_HDBG_ADDR         KSEG1ADDR(ADM5120_SRAM0_BASE+0x4000)
  41 #define BOOTEXT_ADDR_MIN        KSEG1ADDR(ADM5120_SRAM0_BASE)
  42 #define BOOTEXT_ADDR_MAX        (BOOTEXT_ADDR_MIN + (2*1024*1024))
  43
  44 static int bootbase_found;
  45 static struct zynos_board_info *board_info;
  46
  47 struct bootbase_info bootbase_info;
  48
  49 static inline int bootbase_dbgarea_present(u8 *data)
  50 {
  51         u32 t;
  52
  53         t = prom_read_be32(data+5);
  54         if (t != ZYNOS_MAGIC_DBGAREA1)
  55                 return 0;
  56
  57         t = prom_read_be32(data+9);
  58         if (t != ZYNOS_MAGIC_DBGAREA2)
  59                 return 0;
  60
  61         return 1;
  62 }
  63
  64 static inline u32 bootbase_get_bootext_addr(void)
  65 {
  66         return prom_read_be32(&board_info->bootext_addr);
  67 }
  68
  69 static inline u16 bootbase_get_vendor_id(void)
  70 {
  71 #define CHECK_VENDOR(n) (strnicmp(board_info->vendor, (n), strlen(n)) == 0)
  72         unsigned char vendor[ZYNOS_NAME_LEN];
  73         int i;
  74
  75         for (i = 0; i < ZYNOS_NAME_LEN; i++)
  76                 vendor[i] = board_info->vendor[i];
  77
  78         if CHECK_VENDOR(ZYNOS_VENDOR_ZYXEL)
  79                 return ZYNOS_VENDOR_ID_ZYXEL;
  80
  81         if CHECK_VENDOR(ZYNOS_VENDOR_DLINK)
  82                 return ZYNOS_VENDOR_ID_DLINK;
  83
  84         if CHECK_VENDOR(ZYNOS_VENDOR_LUCENT)
  85                 return ZYNOS_VENDOR_ID_LUCENT;
  86
  87         if CHECK_VENDOR(ZYNOS_VENDOR_NETGEAR)
  88                 return ZYNOS_VENDOR_ID_NETGEAR;
  89
  90         return ZYNOS_VENDOR_ID_OTHER;
  91 }
  92
  93 static inline u16 bootbase_get_board_id(void)
  94 {
  95         return prom_read_be16(&board_info->board_id);
  96 }
  97
  98 int __init bootbase_present(void)
  99 {
 100         u32     t;
 101
 102         if (bootbase_found)
 103                 goto out;
 104
 105         /* check presence of the dbgarea */
 106         if (bootbase_dbgarea_present((u8 *)ZYNOS_HDBG_ADDR) == 0)
 107                 goto out;
 108
 109         board_info = (struct zynos_board_info *)(ZYNOS_INFO_ADDR);
 110
 111         /* check for a valid BootExt address */
 112         t = bootbase_get_bootext_addr();
 113         if ((t < BOOTEXT_ADDR_MIN) || (t > BOOTEXT_ADDR_MAX))
 114                 goto out;
 115
 116         bootbase_info.vendor_id = bootbase_get_vendor_id();
 117         bootbase_info.board_id = bootbase_get_board_id();
 118
 119         bootbase_found = 1;
 120
 121 out:
 122         return bootbase_found;
 123 }
 124