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