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. <[email protected]>
   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
  40 void __init __dt_setup_arch(void *bph)
  41 {
  42         if (!early_init_dt_scan(bph))
  43                 return;
  44
  45         mips_set_machine_name(of_flat_dt_get_machine_name());
  46 }
  47
  48 int __init __dt_register_buses(const char *bus0, const char *bus1)
  49 {
  50         static struct of_device_id of_ids[3];
  51
  52         if (!of_have_populated_dt())
  53                 panic("device tree not present");
  54
  55         strlcpy(of_ids[0].compatible, bus0, sizeof(of_ids[0].compatible));
  56         if (bus1) {
  57                 strlcpy(of_ids[1].compatible, bus1,
  58                         sizeof(of_ids[1].compatible));
  59         }
  60
  61         if (of_platform_populate(NULL, of_ids, NULL, NULL))
  62                 panic("failed to populate DT");
  63
  64         return 0;
  65 }
  66
  67 void __weak __init device_tree_init(void)
  68 {
  69         unflatten_and_copy_device_tree();
  70 }
  71
  72 #endif