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
  26static char mips_machine_name[64] = "Unknown";
  27
  28__init void mips_set_machine_name(const char *name)
  29{
  30        if (name == NULL)
  31                return;
  32
  33        strlcpy(mips_machine_name, name, sizeof(mips_machine_name));
  34        pr_info("MIPS: machine is %s\n", mips_get_machine_name());
  35}
  36
  37char *mips_get_machine_name(void)
  38{
  39        return mips_machine_name;
  40}
  41
  42#ifdef CONFIG_OF
  43int __init early_init_dt_scan_memory_arch(unsigned long node,
  44                                          const char *uname, int depth,
  45                                          void *data)
  46{
  47        return early_init_dt_scan_memory(node, uname, depth, data);
  48}
  49
  50void __init early_init_dt_add_memory_arch(u64 base, u64 size)
  51{
  52        return add_memory_region(base, size, BOOT_MEM_RAM);
  53}
  54
  55void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
  56{
  57        return __alloc_bootmem(size, align, __pa(MAX_DMA_ADDRESS));
  58}
  59
  60#ifdef CONFIG_BLK_DEV_INITRD
  61void __init early_init_dt_setup_initrd_arch(u64 start, u64 end)
  62{
  63        initrd_start = (unsigned long)__va(start);
  64        initrd_end = (unsigned long)__va(end);
  65        initrd_below_start_ok = 1;
  66}
  67#endif
  68
  69int __init early_init_dt_scan_model(unsigned long node, const char *uname,
  70                                    int depth, void *data)
  71{
  72        if (!depth) {
  73                char *model = of_get_flat_dt_prop(node, "model", NULL);
  74
  75                if (model)
  76                        mips_set_machine_name(model);
  77        }
  78        return 0;
  79}
  80
  81void __init early_init_devtree(void *params)
  82{
  83        /* Setup flat device-tree pointer */
  84        initial_boot_params = params;
  85
  86        /* Retrieve various informations from the /chosen node of the
  87         * device-tree, including the platform type, initrd location and
  88         * size, and more ...
  89         */
  90        of_scan_flat_dt(early_init_dt_scan_chosen, arcs_cmdline);
  91
  92
  93        /* Scan memory nodes */
  94        of_scan_flat_dt(early_init_dt_scan_root, NULL);
  95        of_scan_flat_dt(early_init_dt_scan_memory_arch, NULL);
  96
  97        /* try to load the mips machine name */
  98        of_scan_flat_dt(early_init_dt_scan_model, NULL);
  99}
 100
 101void __init __dt_setup_arch(struct boot_param_header *bph)
 102{
 103        if (be32_to_cpu(bph->magic) != OF_DT_HEADER) {
 104                pr_err("DTB has bad magic, ignoring builtin OF DTB\n");
 105
 106                return;
 107        }
 108
 109        initial_boot_params = bph;
 110
 111        early_init_devtree(initial_boot_params);
 112}
 113#endif
 114