1/*
  2 * Device tree support
  3 *
  4 * Copyright (C) 2013, 2015 Altera Corporation
  5 * Copyright (C) 2010 Thomas Chou <thomas@wytron.com.tw>
  6 *
  7 * Based on MIPS support for CONFIG_OF device tree support
  8 *
  9 * Copyright (C) 2010 Cisco Systems Inc. <dediao@cisco.com>
 10 *
 11 * This program is free software; you can redistribute it and/or modify
 12 * it under the terms of the GNU General Public License as published by
 13 * the Free Software Foundation; either version 2 of the License, or
 14 * (at your option) any later version.
 15 *
 16 * This program is distributed in the hope that it will be useful,
 17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 19 * GNU General Public License for more details.
 20 *
 21 * You should have received a copy of the GNU General Public License
 22 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 23 *
 24 */
 25
 26#include <linux/init.h>
 27#include <linux/types.h>
 28#include <linux/bootmem.h>
 29#include <linux/of.h>
 30#include <linux/of_fdt.h>
 31#include <linux/io.h>
 32
 33#include <asm/prom.h>
 34#include <asm/sections.h>
 35
 36void __init early_init_dt_add_memory_arch(u64 base, u64 size)
 37{
 38	u64 kernel_start = (u64)virt_to_phys(_text);
 39
 40	if (!memory_size &&
 41	    (kernel_start >= base) && (kernel_start < (base + size)))
 42		memory_size = size;
 43
 44}
 45
 46void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
 47{
 48	return alloc_bootmem_align(size, align);
 49}
 50
 51void __init early_init_devtree(void *params)
 52{
 53	__be32 *dtb = (u32 *)__dtb_start;
 54#if defined(CONFIG_NIOS2_DTB_AT_PHYS_ADDR)
 55	if (be32_to_cpup((__be32 *)CONFIG_NIOS2_DTB_PHYS_ADDR) ==
 56		 OF_DT_HEADER) {
 57		params = (void *)CONFIG_NIOS2_DTB_PHYS_ADDR;
 58		early_init_dt_scan(params);
 59		return;
 60	}
 61#endif
 62	if (be32_to_cpu((__be32) *dtb) == OF_DT_HEADER)
 63		params = (void *)__dtb_start;
 64
 65	early_init_dt_scan(params);
 66}
 67
 68#ifdef CONFIG_EARLY_PRINTK
 69static int __init early_init_dt_scan_serial(unsigned long node,
 70			const char *uname, int depth, void *data)
 71{
 72	u64 *addr64 = (u64 *) data;
 73	const char *p;
 74
 75	/* only consider serial nodes */
 76	if (strncmp(uname, "serial", 6) != 0)
 77		return 0;
 78
 79	p = of_get_flat_dt_prop(node, "compatible", NULL);
 80	if (!p)
 81		return 0;
 82
 83	/*
 84	 * We found an altera_jtaguart but it wasn't configured for console, so
 85	 * skip it.
 86	 */
 87#ifndef CONFIG_SERIAL_ALTERA_JTAGUART_CONSOLE
 88	if (strncmp(p, "altr,juart", 10) == 0)
 89		return 0;
 90#endif
 91
 92	/*
 93	 * Same for altera_uart.
 94	 */
 95#ifndef CONFIG_SERIAL_ALTERA_UART_CONSOLE
 96	if (strncmp(p, "altr,uart", 9) == 0)
 97		return 0;
 98#endif
 99
100	*addr64 = of_flat_dt_translate_address(node);
101
102	return *addr64 == OF_BAD_ADDR ? 0 : 1;
103}
104
105unsigned long __init of_early_console(void)
106{
107	u64 base = 0;
108
109	if (of_scan_flat_dt(early_init_dt_scan_serial, &base))
110		return (u32)ioremap(base, 32);
111	else
112		return 0;
113}
114#endif /* CONFIG_EARLY_PRINTK */