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;
29 EXPORT_SYMBOL_GPL(rt_sysc_membase);
30
plat_of_remap_node(const char * node)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
device_tree_init(void)51 void __init device_tree_init(void)
52 {
53 unflatten_and_copy_device_tree();
54 }
55
56 static int memory_dtb;
57
early_init_dt_find_memory(unsigned long node,const char * uname,int depth,void * data)58 static 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
plat_mem_setup(void)67 void __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 memblock_add(soc_info.mem_base, soc_info.mem_size * SZ_1M);
90 else
91 detect_memory_region(soc_info.mem_base,
92 soc_info.mem_size_min * SZ_1M,
93 soc_info.mem_size_max * SZ_1M);
94 }
95
plat_of_setup(void)96 static int __init plat_of_setup(void)
97 {
98 __dt_register_buses(soc_info.compatible, "palmbus");
99
100 /* make sure that the reset controller is setup early */
101 ralink_rst_init();
102
103 return 0;
104 }
105
106 arch_initcall(plat_of_setup);
107