1/*
2 *  Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
3 *  Copyright (C) 2011, Maarten ter Huurne <maarten@treewalker.org>
4 *  JZ4740 setup code
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 as published by the
8 *  Free Software Foundation;  either version 2 of the License, or (at your
9 *  option) any later version.
10 *
11 *  You should have received a copy of the GNU General Public License along
12 *  with this program; if not, write to the Free Software Foundation, Inc.,
13 *  675 Mass Ave, Cambridge, MA 02139, USA.
14 *
15 */
16
17#include <linux/init.h>
18#include <linux/io.h>
19#include <linux/kernel.h>
20
21#include <asm/bootinfo.h>
22
23#include <asm/mach-jz4740/base.h>
24
25#include "reset.h"
26
27
28#define JZ4740_EMC_SDRAM_CTRL 0x80
29
30
31static void __init jz4740_detect_mem(void)
32{
33	void __iomem *jz_emc_base;
34	u32 ctrl, bus, bank, rows, cols;
35	phys_addr_t size;
36
37	jz_emc_base = ioremap(JZ4740_EMC_BASE_ADDR, 0x100);
38	ctrl = readl(jz_emc_base + JZ4740_EMC_SDRAM_CTRL);
39	bus = 2 - ((ctrl >> 31) & 1);
40	bank = 1 + ((ctrl >> 19) & 1);
41	cols = 8 + ((ctrl >> 26) & 7);
42	rows = 11 + ((ctrl >> 20) & 3);
43	printk(KERN_DEBUG
44		"SDRAM preconfigured: bus:%u bank:%u rows:%u cols:%u\n",
45		bus, bank, rows, cols);
46	iounmap(jz_emc_base);
47
48	size = 1 << (bus + bank + cols + rows);
49	add_memory_region(0, size, BOOT_MEM_RAM);
50}
51
52void __init plat_mem_setup(void)
53{
54	jz4740_reset_init();
55	jz4740_detect_mem();
56}
57
58const char *get_system_type(void)
59{
60	return "JZ4740";
61}
62