1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * MIPS support for CONFIG_OF device tree support
4 *
5 * Copyright (C) 2010 Cisco Systems Inc. <dediao@cisco.com>
6 */
7
8 #include <linux/init.h>
9 #include <linux/export.h>
10 #include <linux/errno.h>
11 #include <linux/types.h>
12 #include <linux/memblock.h>
13 #include <linux/debugfs.h>
14 #include <linux/of.h>
15 #include <linux/of_fdt.h>
16 #include <linux/of_platform.h>
17
18 #include <asm/bootinfo.h>
19 #include <asm/page.h>
20 #include <asm/prom.h>
21
22 static char mips_machine_name[64] = "Unknown";
23
mips_set_machine_name(const char * name)24 __init void mips_set_machine_name(const char *name)
25 {
26 if (name == NULL)
27 return;
28
29 strlcpy(mips_machine_name, name, sizeof(mips_machine_name));
30 pr_info("MIPS: machine is %s\n", mips_get_machine_name());
31 }
32
mips_get_machine_name(void)33 char *mips_get_machine_name(void)
34 {
35 return mips_machine_name;
36 }
37
38 #ifdef CONFIG_USE_OF
early_init_dt_add_memory_arch(u64 base,u64 size)39 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
40 {
41 if (base >= PHYS_ADDR_MAX) {
42 pr_warn("Trying to add an invalid memory region, skipped\n");
43 return;
44 }
45
46 /* Truncate the passed memory region instead of type casting */
47 if (base + size - 1 >= PHYS_ADDR_MAX || base + size < base) {
48 pr_warn("Truncate memory region %llx @ %llx to size %llx\n",
49 size, base, PHYS_ADDR_MAX - base);
50 size = PHYS_ADDR_MAX - base;
51 }
52
53 add_memory_region(base, size, BOOT_MEM_RAM);
54 }
55
early_init_dt_reserve_memory_arch(phys_addr_t base,phys_addr_t size,bool nomap)56 int __init early_init_dt_reserve_memory_arch(phys_addr_t base,
57 phys_addr_t size, bool nomap)
58 {
59 add_memory_region(base, size,
60 nomap ? BOOT_MEM_NOMAP : BOOT_MEM_RESERVED);
61
62 return 0;
63 }
64
__dt_setup_arch(void * bph)65 void __init __dt_setup_arch(void *bph)
66 {
67 if (!early_init_dt_scan(bph))
68 return;
69
70 mips_set_machine_name(of_flat_dt_get_machine_name());
71 }
72
__dt_register_buses(const char * bus0,const char * bus1)73 int __init __dt_register_buses(const char *bus0, const char *bus1)
74 {
75 static struct of_device_id of_ids[3];
76
77 if (!of_have_populated_dt())
78 panic("device tree not present");
79
80 strlcpy(of_ids[0].compatible, bus0, sizeof(of_ids[0].compatible));
81 if (bus1) {
82 strlcpy(of_ids[1].compatible, bus1,
83 sizeof(of_ids[1].compatible));
84 }
85
86 if (of_platform_populate(NULL, of_ids, NULL, NULL))
87 panic("failed to populate DT");
88
89 return 0;
90 }
91
92 #endif
93