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/irqchip.h>
20#include <linux/kernel.h>
21#include <linux/libfdt.h>
22#include <linux/of_fdt.h>
23#include <linux/of_platform.h>
24
25#include <asm/bootinfo.h>
26#include <asm/prom.h>
27
28#include <asm/mach-jz4740/base.h>
29
30#include "reset.h"
31
32
33#define JZ4740_EMC_SDRAM_CTRL 0x80
34
35
36static void __init jz4740_detect_mem(void)
37{
38	void __iomem *jz_emc_base;
39	u32 ctrl, bus, bank, rows, cols;
40	phys_addr_t size;
41
42	jz_emc_base = ioremap(JZ4740_EMC_BASE_ADDR, 0x100);
43	ctrl = readl(jz_emc_base + JZ4740_EMC_SDRAM_CTRL);
44	bus = 2 - ((ctrl >> 31) & 1);
45	bank = 1 + ((ctrl >> 19) & 1);
46	cols = 8 + ((ctrl >> 26) & 7);
47	rows = 11 + ((ctrl >> 20) & 3);
48	printk(KERN_DEBUG
49		"SDRAM preconfigured: bus:%u bank:%u rows:%u cols:%u\n",
50		bus, bank, rows, cols);
51	iounmap(jz_emc_base);
52
53	size = 1 << (bus + bank + cols + rows);
54	add_memory_region(0, size, BOOT_MEM_RAM);
55}
56
57void __init plat_mem_setup(void)
58{
59	int offset;
60
61	jz4740_reset_init();
62	__dt_setup_arch(__dtb_start);
63
64	offset = fdt_path_offset(__dtb_start, "/memory");
65	if (offset < 0)
66		jz4740_detect_mem();
67}
68
69void __init device_tree_init(void)
70{
71	if (!initial_boot_params)
72		return;
73
74	unflatten_and_copy_device_tree();
75}
76
77static int __init populate_machine(void)
78{
79	of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
80	return 0;
81}
82arch_initcall(populate_machine);
83
84const char *get_system_type(void)
85{
86	if (config_enabled(CONFIG_MACH_JZ4780))
87		return "JZ4780";
88
89	return "JZ4740";
90}
91
92void __init arch_init_irq(void)
93{
94	irqchip_init();
95}
96