text: /*
   *  ZyXEL's Bootbase specific prom routines
   *
   *  Copyright (C) 2007-2008 Gabor Juhos <juhosg@openwrt.org>
   *
   *  This program is free software; you can redistribute it and/or modify it
   *  under the terms of the GNU General Public License version 2 as published
   *  by the Free Software Foundation.
   *
   */
  
  #include <linux/types.h>
  #include <linux/kernel.h>
  #include <linux/init.h>
  #include <linux/string.h>
  
  #include <asm/bootinfo.h>
  #include <asm/addrspace.h>
  #include <asm/byteorder.h>
  
  #include <asm/mach-adm5120/adm5120_defs.h>
  #include <prom/zynos.h>
  #include "prom_read.h"
  
  #define ZYNOS_INFO_ADDR		KSEG1ADDR(ADM5120_SRAM0_BASE+0x3F90)
  #define ZYNOS_HDBG_ADDR		KSEG1ADDR(ADM5120_SRAM0_BASE+0x4000)
  #define BOOTEXT_ADDR_MIN	KSEG1ADDR(ADM5120_SRAM0_BASE)
  #define BOOTEXT_ADDR_MAX	(BOOTEXT_ADDR_MIN + (2*1024*1024))
  
  static int bootbase_found;
  static struct zynos_board_info *board_info;
  
  struct bootbase_info bootbase_info;
  
  static inline int bootbase_dbgarea_present(u8 *data)
  {
  	u32 t;
  
  	t = prom_read_be32(data+5);
  	if (t != ZYNOS_MAGIC_DBGAREA1)
  		return 0;
  
  	t = prom_read_be32(data+9);
  	if (t != ZYNOS_MAGIC_DBGAREA2)
  		return 0;
  
  	return 1;
  }
  
  static inline u32 bootbase_get_bootext_addr(void)
  {
  	return prom_read_be32(&board_info->bootext_addr);
  }
  
  static inline void bootbase_get_mac(u8 *mac)
  {
  	int	i;
  
  	for (i = 0; i < 6; i++)
  		mac[i] = board_info->mac[i];
  }
  
  static inline u16 bootbase_get_vendor_id(void)
  {
  #define CHECK_VENDOR(n) (strnicmp(board_info->vendor, (n), strlen(n)) == 0)
  	unsigned char vendor[ZYNOS_NAME_LEN];
  	int i;
  
  	for (i = 0; i < ZYNOS_NAME_LEN; i++)
  		vendor[i] = board_info->vendor[i];
  
  	if CHECK_VENDOR(ZYNOS_VENDOR_ZYXEL)
  		return ZYNOS_VENDOR_ID_ZYXEL;
  
  	if CHECK_VENDOR(ZYNOS_VENDOR_DLINK)
  		return ZYNOS_VENDOR_ID_DLINK;
  
  	if CHECK_VENDOR(ZYNOS_VENDOR_LUCENT)
  		return ZYNOS_VENDOR_ID_LUCENT;
  
  	if CHECK_VENDOR(ZYNOS_VENDOR_NETGEAR)
  		return ZYNOS_VENDOR_ID_NETGEAR;
  
  	return ZYNOS_VENDOR_ID_OTHER;
  }
  
  static inline u16 bootbase_get_board_id(void)
  {
  	return prom_read_be16(&board_info->board_id);
  }
  
  int __init bootbase_present(void)
  {
  	u32	t;
  
  	if (bootbase_found)
  		goto out;
  
  	/* check presence of the dbgarea */
  	if (bootbase_dbgarea_present((u8 *)ZYNOS_HDBG_ADDR) == 0)
  		goto out;
  
  	board_info = (struct zynos_board_info *)(ZYNOS_INFO_ADDR);
  
  	/* check for a valid BootExt address */
  	t = bootbase_get_bootext_addr();
  	if ((t < BOOTEXT_ADDR_MIN) || (t > BOOTEXT_ADDR_MAX))
  		goto out;
  
  	bootbase_info.vendor_id = bootbase_get_vendor_id();
  	bootbase_info.board_id = bootbase_get_board_id();
  	bootbase_get_mac(bootbase_info.mac);
  
  	bootbase_found = 1;
  
  out:
  	return bootbase_found;
  }
  
  