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95acd4c7 LFT |
1 | /* |
2 | * Device tree support | |
3 | * | |
e8bf5bc7 | 4 | * Copyright (C) 2013, 2015 Altera Corporation |
95acd4c7 LFT |
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 | ||
e8bf5bc7 | 33 | #include <asm/prom.h> |
95acd4c7 LFT |
34 | #include <asm/sections.h> |
35 | ||
36 | void __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 | ||
46 | void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align) | |
47 | { | |
48 | return alloc_bootmem_align(size, align); | |
49 | } | |
50 | ||
921d701e TK |
51 | int __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 | ||
95acd4c7 LFT |
58 | void __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 | } | |
e8bf5bc7 LFT |
74 | |
75 | #ifdef CONFIG_EARLY_PRINTK | |
76 | static 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 | ||
8fe88927 | 107 | *addr64 = of_flat_dt_translate_address(node); |
e8bf5bc7 LFT |
108 | |
109 | return *addr64 == OF_BAD_ADDR ? 0 : 1; | |
110 | } | |
111 | ||
112 | unsigned long __init of_early_console(void) | |
113 | { | |
114 | u64 base = 0; | |
115 | ||
116 | if (of_scan_flat_dt(early_init_dt_scan_serial, &base)) | |
117 | return (u32)ioremap(base, 32); | |
118 | else | |
119 | return 0; | |
120 | } | |
121 | #endif /* CONFIG_EARLY_PRINTK */ |