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/system.h>
  46 #include <asm/mmu.h>
  47 #include <asm/pgtable.h>
  48 #include <asm/sections.h>
  49 #include <asm/setup.h>
  50
  51 extern char cmd_line[COMMAND_LINE_SIZE];
  52
  53 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
  54 {
  55         size &= PAGE_MASK;
  56         memblock_add(base, size);
  57 }
  58
  59 void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
  60 {
  61         return __va(memblock_alloc(size, align));
  62 }
  63
  64 void __init early_init_devtree(void *params)
  65 {
  66         void *alloc;
  67
  68         /* Setup flat device-tree pointer */
  69         initial_boot_params = params;
  70
  71
  72         /* Retrieve various informations from the /chosen node of the
  73          * device-tree, including the platform type, initrd location and
  74          * size, TCE reserve, and more ...
  75          */
  76         of_scan_flat_dt(early_init_dt_scan_chosen, cmd_line);
  77
  78         /* Scan memory nodes and rebuild MEMBLOCKs */
  79         of_scan_flat_dt(early_init_dt_scan_root, NULL);
  80         of_scan_flat_dt(early_init_dt_scan_memory, NULL);
  81
  82         /* Save command line for /proc/cmdline and then parse parameters */
  83         strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE);
  84
  85         memblock_allow_resize();
  86
  87         /* We must copy the flattend device tree from init memory to regular
  88          * memory because the device tree references the strings in it
  89          * directly.
  90          */
  91
  92         alloc = __va(memblock_alloc(initial_boot_params->totalsize, PAGE_SIZE));
  93
  94         memcpy(alloc, initial_boot_params, initial_boot_params->totalsize);
  95
  96         initial_boot_params = alloc;
  97 }
  98
  99 #ifdef CONFIG_BLK_DEV_INITRD
 100 void __init early_init_dt_setup_initrd_arch(unsigned long start,
 101                 unsigned long end)
 102 {
 103         initrd_start = (unsigned long)__va(start);
 104         initrd_end = (unsigned long)__va(end);
 105         initrd_below_start_ok = 1;
 106 }
 107 #endif