xref: /openbmc/linux/arch/mips/kernel/prom.c (revision d2912cb1)
1d2912cb1SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only
2f2ffa5abSDezhong Diao /*
3f2ffa5abSDezhong Diao  * MIPS support for CONFIG_OF device tree support
4f2ffa5abSDezhong Diao  *
5f2ffa5abSDezhong Diao  * Copyright (C) 2010 Cisco Systems Inc. <dediao@cisco.com>
6f2ffa5abSDezhong Diao  */
7f2ffa5abSDezhong Diao 
8f2ffa5abSDezhong Diao #include <linux/init.h>
973bc256dSPaul Gortmaker #include <linux/export.h>
10f2ffa5abSDezhong Diao #include <linux/errno.h>
11f2ffa5abSDezhong Diao #include <linux/types.h>
1257c8a661SMike Rapoport #include <linux/memblock.h>
13f2ffa5abSDezhong Diao #include <linux/debugfs.h>
14f2ffa5abSDezhong Diao #include <linux/of.h>
15f2ffa5abSDezhong Diao #include <linux/of_fdt.h>
1684988c06SKevin Cernekee #include <linux/of_platform.h>
17f2ffa5abSDezhong Diao 
1801306aeaSRob Herring #include <asm/bootinfo.h>
19f2ffa5abSDezhong Diao #include <asm/page.h>
20f2ffa5abSDezhong Diao #include <asm/prom.h>
21f2ffa5abSDezhong Diao 
229169a5d0SJohn Crispin static char mips_machine_name[64] = "Unknown";
239169a5d0SJohn Crispin 
249169a5d0SJohn Crispin __init void mips_set_machine_name(const char *name)
259169a5d0SJohn Crispin {
269169a5d0SJohn Crispin 	if (name == NULL)
279169a5d0SJohn Crispin 		return;
289169a5d0SJohn Crispin 
2941c8366bSChen Gang 	strlcpy(mips_machine_name, name, sizeof(mips_machine_name));
309169a5d0SJohn Crispin 	pr_info("MIPS: machine is %s\n", mips_get_machine_name());
319169a5d0SJohn Crispin }
329169a5d0SJohn Crispin 
339169a5d0SJohn Crispin char *mips_get_machine_name(void)
349169a5d0SJohn Crispin {
359169a5d0SJohn Crispin 	return mips_machine_name;
369169a5d0SJohn Crispin }
379169a5d0SJohn Crispin 
38d3557d96SJonas Gorski #ifdef CONFIG_USE_OF
39f2ffa5abSDezhong Diao void __init early_init_dt_add_memory_arch(u64 base, u64 size)
40f2ffa5abSDezhong Diao {
4193fa5b28SSerge Semin 	if (base >= PHYS_ADDR_MAX) {
4293fa5b28SSerge Semin 		pr_warn("Trying to add an invalid memory region, skipped\n");
4393fa5b28SSerge Semin 		return;
4493fa5b28SSerge Semin 	}
4593fa5b28SSerge Semin 
4693fa5b28SSerge Semin 	/* Truncate the passed memory region instead of type casting */
4793fa5b28SSerge Semin 	if (base + size - 1 >= PHYS_ADDR_MAX || base + size < base) {
4893fa5b28SSerge Semin 		pr_warn("Truncate memory region %llx @ %llx to size %llx\n",
4993fa5b28SSerge Semin 			size, base, PHYS_ADDR_MAX - base);
5093fa5b28SSerge Semin 		size = PHYS_ADDR_MAX - base;
5193fa5b28SSerge Semin 	}
5293fa5b28SSerge Semin 
5393fa5b28SSerge Semin 	add_memory_region(base, size, BOOT_MEM_RAM);
54f2ffa5abSDezhong Diao }
55f2ffa5abSDezhong Diao 
5673346081SMarcin Nowakowski int __init early_init_dt_reserve_memory_arch(phys_addr_t base,
5773346081SMarcin Nowakowski 					phys_addr_t size, bool nomap)
5873346081SMarcin Nowakowski {
599b9a59dbSSerge Semin 	add_memory_region(base, size,
609b9a59dbSSerge Semin 			  nomap ? BOOT_MEM_NOMAP : BOOT_MEM_RESERVED);
619b9a59dbSSerge Semin 
6273346081SMarcin Nowakowski 	return 0;
6373346081SMarcin Nowakowski }
6473346081SMarcin Nowakowski 
650cdde839SRob Herring void __init __dt_setup_arch(void *bph)
66f2ffa5abSDezhong Diao {
67f75813c0SRob Herring 	if (!early_init_dt_scan(bph))
68f75813c0SRob Herring 		return;
699169a5d0SJohn Crispin 
7097e7f455SRob Herring 	mips_set_machine_name(of_flat_dt_get_machine_name());
71f2ffa5abSDezhong Diao }
7284988c06SKevin Cernekee 
7384988c06SKevin Cernekee int __init __dt_register_buses(const char *bus0, const char *bus1)
7484988c06SKevin Cernekee {
7584988c06SKevin Cernekee 	static struct of_device_id of_ids[3];
7684988c06SKevin Cernekee 
7784988c06SKevin Cernekee 	if (!of_have_populated_dt())
7884988c06SKevin Cernekee 		panic("device tree not present");
7984988c06SKevin Cernekee 
8084988c06SKevin Cernekee 	strlcpy(of_ids[0].compatible, bus0, sizeof(of_ids[0].compatible));
819127dc47SKevin Cernekee 	if (bus1) {
829127dc47SKevin Cernekee 		strlcpy(of_ids[1].compatible, bus1,
839127dc47SKevin Cernekee 			sizeof(of_ids[1].compatible));
849127dc47SKevin Cernekee 	}
8584988c06SKevin Cernekee 
8684988c06SKevin Cernekee 	if (of_platform_populate(NULL, of_ids, NULL, NULL))
8784988c06SKevin Cernekee 		panic("failed to populate DT");
8884988c06SKevin Cernekee 
8984988c06SKevin Cernekee 	return 0;
9084988c06SKevin Cernekee }
9184988c06SKevin Cernekee 
929169a5d0SJohn Crispin #endif
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