1 /* 2 * MIPS support for CONFIG_OF device tree support 3 * 4 * Copyright (C) 2010 Cisco Systems Inc. <dediao@cisco.com> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 */ 10 11 #include <linux/init.h> 12 #include <linux/export.h> 13 #include <linux/errno.h> 14 #include <linux/types.h> 15 #include <linux/memblock.h> 16 #include <linux/debugfs.h> 17 #include <linux/of.h> 18 #include <linux/of_fdt.h> 19 #include <linux/of_platform.h> 20 21 #include <asm/bootinfo.h> 22 #include <asm/page.h> 23 #include <asm/prom.h> 24 25 static char mips_machine_name[64] = "Unknown"; 26 27 __init void mips_set_machine_name(const char *name) 28 { 29 if (name == NULL) 30 return; 31 32 strlcpy(mips_machine_name, name, sizeof(mips_machine_name)); 33 pr_info("MIPS: machine is %s\n", mips_get_machine_name()); 34 } 35 36 char *mips_get_machine_name(void) 37 { 38 return mips_machine_name; 39 } 40 41 #ifdef CONFIG_USE_OF 42 void __init early_init_dt_add_memory_arch(u64 base, u64 size) 43 { 44 if (base >= PHYS_ADDR_MAX) { 45 pr_warn("Trying to add an invalid memory region, skipped\n"); 46 return; 47 } 48 49 /* Truncate the passed memory region instead of type casting */ 50 if (base + size - 1 >= PHYS_ADDR_MAX || base + size < base) { 51 pr_warn("Truncate memory region %llx @ %llx to size %llx\n", 52 size, base, PHYS_ADDR_MAX - base); 53 size = PHYS_ADDR_MAX - base; 54 } 55 56 add_memory_region(base, size, BOOT_MEM_RAM); 57 } 58 59 int __init early_init_dt_reserve_memory_arch(phys_addr_t base, 60 phys_addr_t size, bool nomap) 61 { 62 add_memory_region(base, size, 63 nomap ? BOOT_MEM_NOMAP : BOOT_MEM_RESERVED); 64 65 return 0; 66 } 67 68 void __init __dt_setup_arch(void *bph) 69 { 70 if (!early_init_dt_scan(bph)) 71 return; 72 73 mips_set_machine_name(of_flat_dt_get_machine_name()); 74 } 75 76 int __init __dt_register_buses(const char *bus0, const char *bus1) 77 { 78 static struct of_device_id of_ids[3]; 79 80 if (!of_have_populated_dt()) 81 panic("device tree not present"); 82 83 strlcpy(of_ids[0].compatible, bus0, sizeof(of_ids[0].compatible)); 84 if (bus1) { 85 strlcpy(of_ids[1].compatible, bus1, 86 sizeof(of_ids[1].compatible)); 87 } 88 89 if (of_platform_populate(NULL, of_ids, NULL, NULL)) 90 panic("failed to populate DT"); 91 92 return 0; 93 } 94 95 #endif 96