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
 24#include <asm/bootinfo.h>
 25#include <asm/prom.h>
 26
 27#include <asm/mach-jz4740/base.h>
 28
 29#include "reset.h"
 30
 31
 32#define JZ4740_EMC_SDRAM_CTRL 0x80
 33
 34
 35static void __init jz4740_detect_mem(void)
 36{
 37	void __iomem *jz_emc_base;
 38	u32 ctrl, bus, bank, rows, cols;
 39	phys_addr_t size;
 40
 41	jz_emc_base = ioremap(JZ4740_EMC_BASE_ADDR, 0x100);
 42	ctrl = readl(jz_emc_base + JZ4740_EMC_SDRAM_CTRL);
 43	bus = 2 - ((ctrl >> 31) & 1);
 44	bank = 1 + ((ctrl >> 19) & 1);
 45	cols = 8 + ((ctrl >> 26) & 7);
 46	rows = 11 + ((ctrl >> 20) & 3);
 47	printk(KERN_DEBUG
 48		"SDRAM preconfigured: bus:%u bank:%u rows:%u cols:%u\n",
 49		bus, bank, rows, cols);
 50	iounmap(jz_emc_base);
 51
 52	size = 1 << (bus + bank + cols + rows);
 53	add_memory_region(0, size, BOOT_MEM_RAM);
 54}
 55
 56static unsigned long __init get_board_mach_type(const void *fdt)
 57{
 58	if (!fdt_node_check_compatible(fdt, 0, "ingenic,jz4780"))
 59		return MACH_INGENIC_JZ4780;
 60	if (!fdt_node_check_compatible(fdt, 0, "ingenic,jz4770"))
 61		return MACH_INGENIC_JZ4770;
 62
 63	return MACH_INGENIC_JZ4740;
 64}
 65
 66void __init plat_mem_setup(void)
 67{
 68	int offset;
 69
 70	jz4740_reset_init();
 71	__dt_setup_arch(__dtb_start);
 72
 73	offset = fdt_path_offset(__dtb_start, "/memory");
 74	if (offset < 0)
 75		jz4740_detect_mem();
 76
 77	mips_machtype = get_board_mach_type(__dtb_start);
 78}
 79
 80void __init device_tree_init(void)
 81{
 82	if (!initial_boot_params)
 83		return;
 84
 85	unflatten_and_copy_device_tree();
 86}
 87
 88const char *get_system_type(void)
 89{
 90	switch (mips_machtype) {
 91	case MACH_INGENIC_JZ4780:
 92		return "JZ4780";
 93	case MACH_INGENIC_JZ4770:
 94		return "JZ4770";
 95	default:
 96		return "JZ4740";
 97	}
 98}
 99
100void __init arch_init_irq(void)
101{
102	irqchip_init();
103}