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 #include <linux/of_irq.h>
  21 #include <linux/of_platform.h>
  22
  23 #include <asm/page.h>
  24 #include <asm/prom.h>
  25
  26 int __init early_init_dt_scan_memory_arch(unsigned long node,
  27                                           const char *uname, int depth,
  28                                           void *data)
  29 {
  30         return early_init_dt_scan_memory(node, uname, depth, data);
  31 }
  32
  33 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
  34 {
  35         return add_memory_region(base, size, BOOT_MEM_RAM);
  36 }
  37
  38 void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
  39 {
  40         return __alloc_bootmem(size, align, __pa(MAX_DMA_ADDRESS));
  41 }
  42
  43 #ifdef CONFIG_BLK_DEV_INITRD
  44 void __init early_init_dt_setup_initrd_arch(unsigned long start,
  45                                             unsigned long end)
  46 {
  47         initrd_start = (unsigned long)__va(start);
  48         initrd_end = (unsigned long)__va(end);
  49         initrd_below_start_ok = 1;
  50 }
  51 #endif
  52
  53 void __init early_init_devtree(void *params)
  54 {
  55         /* Setup flat device-tree pointer */
  56         initial_boot_params = params;
  57
  58         /* Retrieve various informations from the /chosen node of the
  59          * device-tree, including the platform type, initrd location and
  60          * size, and more ...
  61          */
  62         of_scan_flat_dt(early_init_dt_scan_chosen, arcs_cmdline);
  63
  64
  65         /* Scan memory nodes */
  66         of_scan_flat_dt(early_init_dt_scan_root, NULL);
  67         of_scan_flat_dt(early_init_dt_scan_memory_arch, NULL);
  68 }
  69
  70 void __init __dt_setup_arch(struct boot_param_header *bph)
  71 {
  72         if (be32_to_cpu(bph->magic) != OF_DT_HEADER) {
  73                 pr_err("DTB has bad magic, ignoring builtin OF DTB\n");
  74
  75                 return;
  76         }
  77
  78         initial_boot_params = bph;
  79
  80         early_init_devtree(initial_boot_params);
  81 }