arch/mips/kernel/prom.c

   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/bootmem.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         return add_memory_region(base, size, BOOT_MEM_RAM);
  45 }
  46
  47 void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
  48 {
  49         return __alloc_bootmem(size, align, __pa(MAX_DMA_ADDRESS));
  50 }
  51
  52 int __init early_init_dt_reserve_memory_arch(phys_addr_t base,
  53                                         phys_addr_t size, bool nomap)
  54 {
  55         add_memory_region(base, size, BOOT_MEM_RESERVED);
  56         return 0;
  57 }
  58
  59 void __init __dt_setup_arch(void *bph)
  60 {
  61         if (!early_init_dt_scan(bph))
  62                 return;
  63
  64         mips_set_machine_name(of_flat_dt_get_machine_name());
  65 }
  66
  67 int __init __dt_register_buses(const char *bus0, const char *bus1)
  68 {
  69         static struct of_device_id of_ids[3];
  70
  71         if (!of_have_populated_dt())
  72                 panic("device tree not present");
  73
  74         strlcpy(of_ids[0].compatible, bus0, sizeof(of_ids[0].compatible));
  75         if (bus1) {
  76                 strlcpy(of_ids[1].compatible, bus1,
  77                         sizeof(of_ids[1].compatible));
  78         }
  79
  80         if (of_platform_populate(NULL, of_ids, NULL, NULL))
  81                 panic("failed to populate DT");
  82
  83         return 0;
  84 }
  85
  86 #endif