target/linux/adm5120/files-3.18/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/kernel.h>
  14 #include <linux/init.h>
  15 #include <linux/string.h>
  16
  17 #include <asm/bootinfo.h>
  18 #include <asm/addrspace.h>
  19 #include <asm/byteorder.h>
  20
  21 #include <asm/mach-adm5120/adm5120_defs.h>
  22 #include <prom/zynos.h>
  23 #include "prom_read.h"
  24
  25 #define ZYNOS_INFO_ADDR         KSEG1ADDR(ADM5120_SRAM0_BASE+0x3F90)
  26 #define ZYNOS_HDBG_ADDR         KSEG1ADDR(ADM5120_SRAM0_BASE+0x4000)
  27 #define BOOTEXT_ADDR_MIN        KSEG1ADDR(ADM5120_SRAM0_BASE)
  28 #define BOOTEXT_ADDR_MAX        (BOOTEXT_ADDR_MIN + (2*1024*1024))
  29
  30 static int bootbase_found;
  31 static struct zynos_board_info *board_info;
  32
  33 struct bootbase_info bootbase_info;
  34
  35 static inline int bootbase_dbgarea_present(u8 *data)
  36 {
  37         u32 t;
  38
  39         t = prom_read_be32(data+5);
  40         if (t != ZYNOS_MAGIC_DBGAREA1)
  41                 return 0;
  42
  43         t = prom_read_be32(data+9);
  44         if (t != ZYNOS_MAGIC_DBGAREA2)
  45                 return 0;
  46
  47         return 1;
  48 }
  49
  50 static inline u32 bootbase_get_bootext_addr(void)
  51 {
  52         return prom_read_be32(&board_info->bootext_addr);
  53 }
  54
  55 static inline void bootbase_get_mac(u8 *mac)
  56 {
  57         int     i;
  58
  59         for (i = 0; i < 6; i++)
  60                 mac[i] = board_info->mac[i];
  61 }
  62
  63 static inline u16 bootbase_get_vendor_id(void)
  64 {
  65 #define CHECK_VENDOR(n) (strnicmp(board_info->vendor, (n), strlen(n)) == 0)
  66         unsigned char vendor[ZYNOS_NAME_LEN];
  67         int i;
  68
  69         for (i = 0; i < ZYNOS_NAME_LEN; i++)
  70                 vendor[i] = board_info->vendor[i];
  71
  72         if CHECK_VENDOR(ZYNOS_VENDOR_ZYXEL)
  73                 return ZYNOS_VENDOR_ID_ZYXEL;
  74
  75         if CHECK_VENDOR(ZYNOS_VENDOR_DLINK)
  76                 return ZYNOS_VENDOR_ID_DLINK;
  77
  78         if CHECK_VENDOR(ZYNOS_VENDOR_LUCENT)
  79                 return ZYNOS_VENDOR_ID_LUCENT;
  80
  81         if CHECK_VENDOR(ZYNOS_VENDOR_NETGEAR)
  82                 return ZYNOS_VENDOR_ID_NETGEAR;
  83
  84         return ZYNOS_VENDOR_ID_OTHER;
  85 }
  86
  87 static inline u16 bootbase_get_board_id(void)
  88 {
  89         return prom_read_be16(&board_info->board_id);
  90 }
  91
  92 int __init bootbase_present(void)
  93 {
  94         u32     t;
  95
  96         if (bootbase_found)
  97                 goto out;
  98
  99         /* check presence of the dbgarea */
 100         if (bootbase_dbgarea_present((u8 *)ZYNOS_HDBG_ADDR) == 0)
 101                 goto out;
 102
 103         board_info = (struct zynos_board_info *)(ZYNOS_INFO_ADDR);
 104
 105         /* check for a valid BootExt address */
 106         t = bootbase_get_bootext_addr();
 107         if ((t < BOOTEXT_ADDR_MIN) || (t > BOOTEXT_ADDR_MAX))
 108                 goto out;
 109
 110         bootbase_info.vendor_id = bootbase_get_vendor_id();
 111         bootbase_info.board_id = bootbase_get_board_id();
 112         bootbase_get_mac(bootbase_info.mac);
 113
 114         bootbase_found = 1;
 115
 116 out:
 117         return bootbase_found;
 118 }
 119