Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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_nocache(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);