arch/openrisc/kernel/prom.c

   1 /*
   2  * OpenRISC prom.c
   3  *
   4  * Linux architectural port borrowing liberally from similar works of
   5  * others.  All original copyrights apply as per the original source
   6  * declaration.
   7  *
   8  * Modifications for the OpenRISC architecture:
   9  * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
  10  *
  11  *      This program is free software; you can redistribute it and/or
  12  *      modify it under the terms of the GNU General Public License
  13  *      as published by the Free Software Foundation; either version
  14  *      2 of the License, or (at your option) any later version.
  15  *
  16  * Architecture specific procedures for creating, accessing and
  17  * interpreting the device tree.
  18  *
  19  */
  20
  21 #include <stdarg.h>
  22 #include <linux/kernel.h>
  23 #include <linux/string.h>
  24 #include <linux/init.h>
  25 #include <linux/threads.h>
  26 #include <linux/spinlock.h>
  27 #include <linux/types.h>
  28 #include <linux/pci.h>
  29 #include <linux/stringify.h>
  30 #include <linux/delay.h>
  31 #include <linux/initrd.h>
  32 #include <linux/bitops.h>
  33 #include <linux/module.h>
  34 #include <linux/kexec.h>
  35 #include <linux/debugfs.h>
  36 #include <linux/irq.h>
  37 #include <linux/memblock.h>
  38 #include <linux/of_fdt.h>
  39
  40 #include <asm/prom.h>
  41 #include <asm/page.h>
  42 #include <asm/processor.h>
  43 #include <asm/irq.h>
  44 #include <linux/io.h>
  45 #include <asm/mmu.h>
  46 #include <asm/pgtable.h>
  47 #include <asm/sections.h>
  48 #include <asm/setup.h>
  49
  50 extern char cmd_line[COMMAND_LINE_SIZE];
  51
  52 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
  53 {
  54         size &= PAGE_MASK;
  55         memblock_add(base, size);
  56 }
  57
  58 void __init early_init_devtree(void *params)
  59 {
  60         void *alloc;
  61
  62         /* Setup flat device-tree pointer */
  63         initial_boot_params = params;
  64
  65
  66         /* Retrieve various informations from the /chosen node of the
  67          * device-tree, including the platform type, initrd location and
  68          * size, TCE reserve, and more ...
  69          */
  70         of_scan_flat_dt(early_init_dt_scan_chosen, cmd_line);
  71
  72         /* Scan memory nodes and rebuild MEMBLOCKs */
  73         of_scan_flat_dt(early_init_dt_scan_root, NULL);
  74         of_scan_flat_dt(early_init_dt_scan_memory, NULL);
  75
  76         /* Save command line for /proc/cmdline and then parse parameters */
  77         strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE);
  78
  79         memblock_allow_resize();
  80
  81         /* We must copy the flattend device tree from init memory to regular
  82          * memory because the device tree references the strings in it
  83          * directly.
  84          */
  85
  86         alloc = __va(memblock_alloc(initial_boot_params->totalsize, PAGE_SIZE));
  87
  88         memcpy(alloc, initial_boot_params, initial_boot_params->totalsize);
  89
  90         initial_boot_params = alloc;
  91 }
  92
  93 #ifdef CONFIG_BLK_DEV_INITRD
  94 void __init early_init_dt_setup_initrd_arch(unsigned long start,
  95                 unsigned long end)
  96 {
  97         initrd_start = (unsigned long)__va(start);
  98         initrd_end = (unsigned long)__va(end);
  99         initrd_below_start_ok = 1;
 100 }
 101 #endif