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.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#include <asm/mach-ralink/ralink_regs.h>
25
26#include "common.h"
27
28__iomem void *rt_sysc_membase;
29__iomem void *rt_memc_membase;
30EXPORT_SYMBOL_GPL(rt_sysc_membase);
31
32static const struct of_device_id mtmips_memc_match[] = {
33 { .compatible = "mediatek,mt7621-memc" },
34 { .compatible = "ralink,mt7620a-memc" },
35 { .compatible = "ralink,rt2880-memc" },
36 { .compatible = "ralink,rt3050-memc" },
37 { .compatible = "ralink,rt3883-memc" },
38 {}
39};
40
41static const struct of_device_id mtmips_sysc_match[] = {
42 { .compatible = "mediatek,mt7621-sysc" },
43 { .compatible = "ralink,mt7620-sysc" },
44 { .compatible = "ralink,mt7628-sysc" },
45 { .compatible = "ralink,mt7688-sysc" },
46 { .compatible = "ralink,rt2880-sysc" },
47 { .compatible = "ralink,rt3050-sysc" },
48 { .compatible = "ralink,rt3052-sysc" },
49 { .compatible = "ralink,rt3352-sysc" },
50 { .compatible = "ralink,rt3883-sysc" },
51 { .compatible = "ralink,rt5350-sysc" },
52 {}
53};
54
55static __iomem void *
56mtmips_of_remap_node(const struct of_device_id *match, const char *type)
57{
58 struct resource res;
59 struct device_node *np;
60
61 np = of_find_matching_node(NULL, matches: match);
62 if (!np)
63 panic(fmt: "Failed to find %s controller node", type);
64
65 if (of_address_to_resource(dev: np, index: 0, r: &res))
66 panic(fmt: "Failed to get resource for %s node", np->name);
67
68 if (!request_mem_region(res.start,
69 resource_size(&res),
70 res.name))
71 panic(fmt: "Failed to request resources for %s node", np->name);
72
73 of_node_put(node: np);
74
75 return ioremap(offset: res.start, size: resource_size(res: &res));
76}
77
78void __init ralink_of_remap(void)
79{
80 rt_sysc_membase = mtmips_of_remap_node(match: mtmips_sysc_match, type: "system");
81 rt_memc_membase = mtmips_of_remap_node(match: mtmips_memc_match, type: "memory");
82
83 if (!rt_sysc_membase || !rt_memc_membase)
84 panic(fmt: "Failed to remap core resources");
85}
86
87void __init plat_mem_setup(void)
88{
89 void *dtb;
90
91 set_io_port_base(KSEG1);
92
93 /*
94 * Load the builtin devicetree. This causes the chosen node to be
95 * parsed resulting in our memory appearing.
96 */
97 dtb = get_fdt();
98 __dt_setup_arch(dtb);
99
100 if (early_init_dt_scan_memory())
101 return;
102
103 if (soc_info.mem_detect)
104 soc_info.mem_detect();
105 else if (soc_info.mem_size)
106 memblock_add(base: soc_info.mem_base, size: soc_info.mem_size * SZ_1M);
107 else
108 detect_memory_region(soc_info.mem_base,
109 soc_info.mem_size_min * SZ_1M,
110 soc_info.mem_size_max * SZ_1M);
111}
112
113static int __init plat_of_setup(void)
114{
115 __dt_register_buses(soc_info.compatible, "palmbus");
116
117 return 0;
118}
119
120arch_initcall(plat_of_setup);
121

source code of linux/arch/mips/ralink/of.c