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 <john@phrozen.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
 31__iomem void *plat_of_remap_node(const char *node)
 32{
 33	struct resource res;
 34	struct device_node *np;
 35
 36	np = of_find_compatible_node(NULL, NULL, node);
 37	if (!np)
 38		panic("Failed to find %s node", node);
 39
 40	if (of_address_to_resource(np, 0, &res))
 41		panic("Failed to get resource for %s", node);
 42
 43	if (!request_mem_region(res.start,
 44				resource_size(&res),
 45				res.name))
 46		panic("Failed to request resources for %s", node);
 47
 48	return ioremap_nocache(res.start, resource_size(&res));
 49}
 50
 51void __init device_tree_init(void)
 52{
 53	unflatten_and_copy_device_tree();
 54}
 55
 56static int memory_dtb;
 57
 58static int __init early_init_dt_find_memory(unsigned long node,
 59				const char *uname, int depth, void *data)
 60{
 61	if (depth == 1 && !strcmp(uname, "memory@0"))
 62		memory_dtb = 1;
 63
 64	return 0;
 65}
 66
 67void __init plat_mem_setup(void)
 68{
 69	void *dtb = NULL;
 70
 71	set_io_port_base(KSEG1);
 72
 73	/*
 74	 * Load the builtin devicetree. This causes the chosen node to be
 75	 * parsed resulting in our memory appearing. fw_passed_dtb is used
 76	 * by CONFIG_MIPS_APPENDED_RAW_DTB as well.
 77	 */
 78	if (fw_passed_dtb)
 79		dtb = (void *)fw_passed_dtb;
 80	else if (__dtb_start != __dtb_end)
 81		dtb = (void *)__dtb_start;
 82
 83	__dt_setup_arch(dtb);
 84
 85	of_scan_flat_dt(early_init_dt_find_memory, NULL);
 86	if (memory_dtb)
 87		of_scan_flat_dt(early_init_dt_scan_memory, NULL);
 88	else if (soc_info.mem_size)
 89		add_memory_region(soc_info.mem_base, soc_info.mem_size * SZ_1M,
 90				  BOOT_MEM_RAM);
 91	else
 92		detect_memory_region(soc_info.mem_base,
 93				     soc_info.mem_size_min * SZ_1M,
 94				     soc_info.mem_size_max * SZ_1M);
 95}
 96
 97static int __init plat_of_setup(void)
 98{
 99	__dt_register_buses(soc_info.compatible, "palmbus");
100
101	/* make sure that the reset controller is setup early */
102	ralink_rst_init();
103
104	return 0;
105}
106
107arch_initcall(plat_of_setup);