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/initrd.h>
  17 #include <linux/debugfs.h>
  18 #include <linux/of.h>
  19 #include <linux/of_fdt.h>
  20
  21 #include <asm/page.h>
  22 #include <asm/prom.h>
  23
  24 static char mips_machine_name[64] = "Unknown";
  25
  26 __init void mips_set_machine_name(const char *name)
  27 {
  28         if (name == NULL)
  29                 return;
  30
  31         strlcpy(mips_machine_name, name, sizeof(mips_machine_name));
  32         pr_info("MIPS: machine is %s\n", mips_get_machine_name());
  33 }
  34
  35 char *mips_get_machine_name(void)
  36 {
  37         return mips_machine_name;
  38 }
  39
  40 #ifdef CONFIG_OF
  41 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
  42 {
  43         return add_memory_region(base, size, BOOT_MEM_RAM);
  44 }
  45
  46 void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
  47 {
  48         return __alloc_bootmem(size, align, __pa(MAX_DMA_ADDRESS));
  49 }
  50
  51 #ifdef CONFIG_BLK_DEV_INITRD
  52 void __init early_init_dt_setup_initrd_arch(u64 start, u64 end)
  53 {
  54         initrd_start = (unsigned long)__va(start);
  55         initrd_end = (unsigned long)__va(end);
  56         initrd_below_start_ok = 1;
  57 }
  58 #endif
  59
  60 int __init early_init_dt_scan_model(unsigned long node, const char *uname,
  61                                     int depth, void *data)
  62 {
  63         if (!depth) {
  64                 char *model = of_get_flat_dt_prop(node, "model", NULL);
  65
  66                 if (model)
  67                         mips_set_machine_name(model);
  68         }
  69         return 0;
  70 }
  71
  72 void __init __dt_setup_arch(struct boot_param_header *bph)
  73 {
  74         if (!early_init_dt_scan(bph))
  75                 return;
  76
  77         /* try to load the mips machine name */
  78         of_scan_flat_dt(early_init_dt_scan_model, NULL);
  79 }
  80 #endif