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 = fdt_translate_address((const void *)initial_boot_params,
101		node);
102
103	return *addr64 == OF_BAD_ADDR ? 0 : 1;
104}
105
106unsigned long __init of_early_console(void)
107{
108	u64 base = 0;
109
110	if (of_scan_flat_dt(early_init_dt_scan_serial, &base))
111		return (u32)ioremap(base, 32);
112	else
113		return 0;
114}
115#endif /* CONFIG_EARLY_PRINTK */
116