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 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 33 char *mips_get_machine_name(void) 34 { 35 return mips_machine_name; 36 } 37 38 #ifdef CONFIG_USE_OF 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 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 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 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