source: src/linux/universal/linux-4.4/arch/nios2/kernel/prom.c @ 31859

Last change on this file since 31859 was 31859, checked in by brainslayer, 6 weeks ago

kernel update

File size: 3.0 KB
Line 
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
51int __init early_init_dt_reserve_memory_arch(phys_addr_t base, phys_addr_t size,
52                                             bool nomap)
53{
54        reserve_bootmem(base, size, BOOTMEM_DEFAULT);
55        return 0;
56}
57
58void __init early_init_devtree(void *params)
59{
60        __be32 *dtb = (u32 *)__dtb_start;
61#if defined(CONFIG_NIOS2_DTB_AT_PHYS_ADDR)
62        if (be32_to_cpup((__be32 *)CONFIG_NIOS2_DTB_PHYS_ADDR) ==
63                 OF_DT_HEADER) {
64                params = (void *)CONFIG_NIOS2_DTB_PHYS_ADDR;
65                early_init_dt_scan(params);
66                return;
67        }
68#endif
69        if (be32_to_cpu((__be32) *dtb) == OF_DT_HEADER)
70                params = (void *)__dtb_start;
71
72        early_init_dt_scan(params);
73}
74
75#ifdef CONFIG_EARLY_PRINTK
76static int __init early_init_dt_scan_serial(unsigned long node,
77                        const char *uname, int depth, void *data)
78{
79        u64 *addr64 = (u64 *) data;
80        const char *p;
81
82        /* only consider serial nodes */
83        if (strncmp(uname, "serial", 6) != 0)
84                return 0;
85
86        p = of_get_flat_dt_prop(node, "compatible", NULL);
87        if (!p)
88                return 0;
89
90        /*
91         * We found an altera_jtaguart but it wasn't configured for console, so
92         * skip it.
93         */
94#ifndef CONFIG_SERIAL_ALTERA_JTAGUART_CONSOLE
95        if (strncmp(p, "altr,juart", 10) == 0)
96                return 0;
97#endif
98
99        /*
100         * Same for altera_uart.
101         */
102#ifndef CONFIG_SERIAL_ALTERA_UART_CONSOLE
103        if (strncmp(p, "altr,uart", 9) == 0)
104                return 0;
105#endif
106
107        *addr64 = fdt_translate_address((const void *)initial_boot_params,
108                node);
109
110        return *addr64 == OF_BAD_ADDR ? 0 : 1;
111}
112
113unsigned long __init of_early_console(void)
114{
115        u64 base = 0;
116
117        if (of_scan_flat_dt(early_init_dt_scan_serial, &base))
118                return (u32)ioremap(base, 32);
119        else
120                return 0;
121}
122#endif /* CONFIG_EARLY_PRINTK */
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