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/module.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
  38int __init reserve_mem_mach(unsigned long addr, unsigned long size)
  39{
  40        return reserve_bootmem(addr, size, BOOTMEM_DEFAULT);
  41}
  42
  43void __init free_mem_mach(unsigned long addr, unsigned long size)
  44{
  45        return free_bootmem(addr, size);
  46}
  47
  48void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
  49{
  50        return __alloc_bootmem(size, align, __pa(MAX_DMA_ADDRESS));
  51}
  52
  53#ifdef CONFIG_BLK_DEV_INITRD
  54void __init early_init_dt_setup_initrd_arch(unsigned long start,
  55                                            unsigned long end)
  56{
  57        initrd_start = (unsigned long)__va(start);
  58        initrd_end = (unsigned long)__va(end);
  59        initrd_below_start_ok = 1;
  60}
  61#endif
  62
  63/*
  64 * irq_create_of_mapping - Hook to resolve OF irq specifier into a Linux irq#
  65 *
  66 * Currently the mapping mechanism is trivial; simple flat hwirq numbers are
  67 * mapped 1:1 onto Linux irq numbers.  Cascaded irq controllers are not
  68 * supported.
  69 */
  70unsigned int irq_create_of_mapping(struct device_node *controller,
  71                                   const u32 *intspec, unsigned int intsize)
  72{
  73        return intspec[0];
  74}
  75EXPORT_SYMBOL_GPL(irq_create_of_mapping);
  76
  77void __init early_init_devtree(void *params)
  78{
  79        /* Setup flat device-tree pointer */
  80        initial_boot_params = params;
  81
  82        /* Retrieve various informations from the /chosen node of the
  83         * device-tree, including the platform type, initrd location and
  84         * size, and more ...
  85         */
  86        of_scan_flat_dt(early_init_dt_scan_chosen, NULL);
  87
  88        /* Scan memory nodes */
  89        of_scan_flat_dt(early_init_dt_scan_root, NULL);
  90        of_scan_flat_dt(early_init_dt_scan_memory_arch, NULL);
  91}
  92
  93void __init device_tree_init(void)
  94{
  95        unsigned long base, size;
  96
  97        if (!initial_boot_params)
  98                return;
  99
 100        base = virt_to_phys((void *)initial_boot_params);
 101        size = be32_to_cpu(initial_boot_params->totalsize);
 102
 103        /* Before we do anything, lets reserve the dt blob */
 104        reserve_mem_mach(base, size);
 105
 106        unflatten_device_tree();
 107
 108        /* free the space reserved for the dt blob */
 109        free_mem_mach(base, size);
 110}
 111