1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 *
  4 * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
  5 * Copyright (C) 2008-2009 Gabor Juhos <juhosg@openwrt.org>
  6 * Copyright (C) 2013 John Crispin <john@phrozen.org>
  7 */
  8
  9#include <linux/io.h>
 10#include <linux/clk.h>
 11#include <linux/export.h>
 12#include <linux/init.h>
 13#include <linux/sizes.h>
 14#include <linux/of_fdt.h>
 15#include <linux/kernel.h>
 16#include <linux/memblock.h>
 17#include <linux/of_platform.h>
 18#include <linux/of_address.h>
 19
 20#include <asm/reboot.h>
 21#include <asm/bootinfo.h>
 22#include <asm/addrspace.h>
 23#include <asm/prom.h>
 24
 25#include "common.h"
 26
 27__iomem void *rt_sysc_membase;
 28__iomem void *rt_memc_membase;
 29EXPORT_SYMBOL_GPL(rt_sysc_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(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;
 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.
 76	 */
 77	dtb = get_fdt();
 78	__dt_setup_arch(dtb);
 79
 80	of_scan_flat_dt(early_init_dt_find_memory, NULL);
 81	if (memory_dtb)
 82		of_scan_flat_dt(early_init_dt_scan_memory, NULL);
 83	else if (soc_info.mem_detect)
 84		soc_info.mem_detect();
 85	else if (soc_info.mem_size)
 86		memblock_add(soc_info.mem_base, soc_info.mem_size * SZ_1M);
 87	else
 88		detect_memory_region(soc_info.mem_base,
 89				     soc_info.mem_size_min * SZ_1M,
 90				     soc_info.mem_size_max * SZ_1M);
 91}
 92
 93static int __init plat_of_setup(void)
 94{
 95	__dt_register_buses(soc_info.compatible, "palmbus");
 96
 97	/* make sure that the reset controller is setup early */
 98	ralink_rst_init();
 99
100	return 0;
101}
102
103arch_initcall(plat_of_setup);