arch/mips/kernel/prom.c

   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         strscpy(mips_machine_name, name, sizeof(mips_machine_name));
  30         pr_info("MIPS: machine is %s\n", mips_get_machine_name());
  31
  32         dump_stack_set_arch_desc(name);
  33 }
  34
  35 char *mips_get_machine_name(void)
  36 {
  37         return mips_machine_name;
  38 }
  39
  40 #ifdef CONFIG_USE_OF
  41
  42 void __init __dt_setup_arch(void *bph)
  43 {
  44         if (!early_init_dt_scan(bph, __pa(bph)))
  45                 return;
  46
  47         mips_set_machine_name(of_flat_dt_get_machine_name());
  48 }
  49
  50 int __init __dt_register_buses(const char *bus0, const char *bus1)
  51 {
  52         static struct of_device_id of_ids[3];
  53
  54         if (!of_have_populated_dt())
  55                 panic("device tree not present");
  56
  57         strscpy(of_ids[0].compatible, bus0, sizeof(of_ids[0].compatible));
  58         if (bus1) {
  59                 strscpy(of_ids[1].compatible, bus1,
  60                         sizeof(of_ids[1].compatible));
  61         }
  62
  63         if (of_platform_populate(NULL, of_ids, NULL, NULL))
  64                 panic("failed to populate DT");
  65
  66         return 0;
  67 }
  68
  69 void __weak __init device_tree_init(void)
  70 {
  71         unflatten_and_copy_device_tree();
  72 }
  73
  74 #endif