LXR linux/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
  26int __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
  33void __init early_init_dt_add_memory_arch(u64 base, u64 size)
  34{
  35        return add_memory_region(base, size, BOOT_MEM_RAM);
  36}
  37
  38void * __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
  44void __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
  53void __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
  70void __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}
  82