/*
   *  Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
   *  Copyright (C) 2011, Maarten ter Huurne <maarten@treewalker.org>
   *  JZ4740 setup code
   *
   *  This program is free software; you can redistribute it and/or modify it
   *  under  the terms of the GNU General	 Public License as published by the
   *  Free Software Foundation;  either version 2 of the License, or (at your
   *  option) any later version.
   *
   *  You should have received a copy of the GNU General Public License along
   *  with this program; if not, write to the Free Software Foundation, Inc.,
   *  675 Mass Ave, Cambridge, MA 02139, USA.
   *
   */
  
  #include <linux/init.h>
  #include <linux/io.h>
  #include <linux/kernel.h>
  
  #include <asm/bootinfo.h>
  
  #include <asm/mach-jz4740/base.h>
  
  #include "reset.h"
  
  
  #define JZ4740_EMC_SDRAM_CTRL 0x80
  
  
  static void __init jz4740_detect_mem(void)
  {
  	void __iomem *jz_emc_base;
  	u32 ctrl, bus, bank, rows, cols;
  	phys_t size;
  
  	jz_emc_base = ioremap(JZ4740_EMC_BASE_ADDR, 0x100);
  	ctrl = readl(jz_emc_base + JZ4740_EMC_SDRAM_CTRL);
  	bus = 2 - ((ctrl >> 31) & 1);
  	bank = 1 + ((ctrl >> 19) & 1);
  	cols = 8 + ((ctrl >> 26) & 7);
  	rows = 11 + ((ctrl >> 20) & 3);
  	printk(KERN_DEBUG
  		"SDRAM preconfigured: bus:%u bank:%u rows:%u cols:%u
  ",
  		bus, bank, rows, cols);
  	iounmap(jz_emc_base);
  
  	size = 1 << (bus + bank + cols + rows);
  	add_memory_region(0, size, BOOT_MEM_RAM);
  }
  
  void __init plat_mem_setup(void)
  {
  	jz4740_reset_init();
  	jz4740_detect_mem();
  }
  
  const char *get_system_type(void)
  {
  	return "JZ4740";
  }