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/init.h>
 12#include <linux/sizes.h>
 13#include <linux/of_fdt.h>
 14#include <linux/kernel.h>
 15#include <linux/memblock.h>
 16#include <linux/of_platform.h>
 17#include <linux/of_address.h>
 18
 19#include <asm/reboot.h>
 20#include <asm/bootinfo.h>
 21#include <asm/addrspace.h>
 22#include <asm/prom.h>
 23
 24#include "common.h"
 25
 26__iomem void *rt_sysc_membase;
 27__iomem void *rt_memc_membase;
 28
 29__iomem void *plat_of_remap_node(const char *node)
 30{
 31	struct resource res;
 32	struct device_node *np;
 33
 34	np = of_find_compatible_node(NULL, NULL, node);
 35	if (!np)
 36		panic("Failed to find %s node", node);
 37
 38	if (of_address_to_resource(np, 0, &res))
 39		panic("Failed to get resource for %s", node);
 40
 41	if (!request_mem_region(res.start,
 42				resource_size(&res),
 43				res.name))
 44		panic("Failed to request resources for %s", node);
 45
 46	return ioremap(res.start, resource_size(&res));
 47}
 48
 49void __init device_tree_init(void)
 50{
 51	unflatten_and_copy_device_tree();
 52}
 53
 54static int memory_dtb;
 55
 56static int __init early_init_dt_find_memory(unsigned long node,
 57				const char *uname, int depth, void *data)
 58{
 59	if (depth == 1 && !strcmp(uname, "memory@0"))
 60		memory_dtb = 1;
 61
 62	return 0;
 63}
 64
 65void __init plat_mem_setup(void)
 66{
 67	void *dtb = NULL;
 68
 69	set_io_port_base(KSEG1);
 70
 71	/*
 72	 * Load the builtin devicetree. This causes the chosen node to be
 73	 * parsed resulting in our memory appearing. fw_passed_dtb is used
 74	 * by CONFIG_MIPS_APPENDED_RAW_DTB as well.
 75	 */
 76	if (fw_passed_dtb)
 77		dtb = (void *)fw_passed_dtb;
 78	else if (__dtb_start != __dtb_end)
 79		dtb = (void *)__dtb_start;
 80
 81	__dt_setup_arch(dtb);
 82
 83	of_scan_flat_dt(early_init_dt_find_memory, NULL);
 84	if (memory_dtb)
 85		of_scan_flat_dt(early_init_dt_scan_memory, NULL);
 86	else if (soc_info.mem_size)
 87		add_memory_region(soc_info.mem_base, soc_info.mem_size * SZ_1M,
 88				  BOOT_MEM_RAM);
 89	else
 90		detect_memory_region(soc_info.mem_base,
 91				     soc_info.mem_size_min * SZ_1M,
 92				     soc_info.mem_size_max * SZ_1M);
 93}
 94
 95static int __init plat_of_setup(void)
 96{
 97	__dt_register_buses(soc_info.compatible, "palmbus");
 98
 99	/* make sure that the reset controller is setup early */
100	ralink_rst_init();
101
102	return 0;
103}
104
105arch_initcall(plat_of_setup);