1/*
  2 * This program is free software; you can redistribute it and/or modify it
  3 * under the terms of the GNU General Public License version 2 as published
  4 * by the Free Software Foundation.
  5 *
  6 * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
  7 * Copyright (C) 2008-2009 Gabor Juhos <juhosg@openwrt.org>
  8 * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
  9 */
 10
 11#include <linux/io.h>
 12#include <linux/clk.h>
 13#include <linux/init.h>
 14#include <linux/sizes.h>
 15#include <linux/of_fdt.h>
 16#include <linux/kernel.h>
 17#include <linux/bootmem.h>
 18#include <linux/of_platform.h>
 19#include <linux/of_address.h>
 20
 21#include <asm/reboot.h>
 22#include <asm/bootinfo.h>
 23#include <asm/addrspace.h>
 24#include <asm/prom.h>
 25
 26#include "common.h"
 27
 28__iomem void *rt_sysc_membase;
 29__iomem void *rt_memc_membase;
 30
 31extern struct boot_param_header __dtb_start;
 32
 33__iomem void *plat_of_remap_node(const char *node)
 34{
 35	struct resource res;
 36	struct device_node *np;
 37
 38	np = of_find_compatible_node(NULL, NULL, node);
 39	if (!np)
 40		panic("Failed to find %s node", node);
 41
 42	if (of_address_to_resource(np, 0, &res))
 43		panic("Failed to get resource for %s", node);
 44
 45	if ((request_mem_region(res.start,
 46				resource_size(&res),
 47				res.name) < 0))
 48		panic("Failed to request resources for %s", node);
 49
 50	return ioremap_nocache(res.start, resource_size(&res));
 51}
 52
 53void __init device_tree_init(void)
 54{
 55	unsigned long base, size;
 56	void *fdt_copy;
 57
 58	if (!initial_boot_params)
 59		return;
 60
 61	base = virt_to_phys((void *)initial_boot_params);
 62	size = be32_to_cpu(initial_boot_params->totalsize);
 63
 64	/* Before we do anything, lets reserve the dt blob */
 65	reserve_bootmem(base, size, BOOTMEM_DEFAULT);
 66
 67	/* The strings in the flattened tree are referenced directly by the
 68	 * device tree, so copy the flattened device tree from init memory
 69	 * to regular memory.
 70	 */
 71	fdt_copy = alloc_bootmem(size);
 72	memcpy(fdt_copy, initial_boot_params, size);
 73	initial_boot_params = fdt_copy;
 74
 75	unflatten_device_tree();
 76
 77	/* free the space reserved for the dt blob */
 78	free_bootmem(base, size);
 79}
 80
 81void __init plat_mem_setup(void)
 82{
 83	set_io_port_base(KSEG1);
 84
 85	/*
 86	 * Load the builtin devicetree. This causes the chosen node to be
 87	 * parsed resulting in our memory appearing
 88	 */
 89	__dt_setup_arch(&__dtb_start);
 90
 91	if (soc_info.mem_size)
 92		add_memory_region(soc_info.mem_base, soc_info.mem_size * SZ_1M,
 93				  BOOT_MEM_RAM);
 94	else
 95		detect_memory_region(soc_info.mem_base,
 96				     soc_info.mem_size_min * SZ_1M,
 97				     soc_info.mem_size_max * SZ_1M);
 98}
 99
100static int __init plat_of_setup(void)
101{
102	static struct of_device_id of_ids[3];
103	int len = sizeof(of_ids[0].compatible);
104
105	if (!of_have_populated_dt())
106		panic("device tree not present");
107
108	strlcpy(of_ids[0].compatible, soc_info.compatible, len);
109	strncpy(of_ids[1].compatible, "palmbus", len);
110
111	if (of_platform_populate(NULL, of_ids, NULL, NULL))
112		panic("failed to populate DT");
113
114	/* make sure ithat the reset controller is setup early */
115	ralink_rst_init();
116
117	return 0;
118}
119
120arch_initcall(plat_of_setup);