4 * Copyright (C) 2013, 2015 Altera Corporation
5 * Copyright (C) 2010 Thomas Chou <thomas@wytron.com.tw>
7 * Based on MIPS support for CONFIG_OF device tree support
9 * Copyright (C) 2010 Cisco Systems Inc. <dediao@cisco.com>
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.
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.
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/>.
26 #include <linux/init.h>
27 #include <linux/types.h>
28 #include <linux/bootmem.h>
30 #include <linux/of_fdt.h>
34 #include <asm/sections.h>
36 void __init
early_init_dt_add_memory_arch(u64 base
, u64 size
)
38 u64 kernel_start
= (u64
)virt_to_phys(_text
);
41 (kernel_start
>= base
) && (kernel_start
< (base
+ size
)))
46 void * __init
early_init_dt_alloc_memory_arch(u64 size
, u64 align
)
48 return alloc_bootmem_align(size
, align
);
51 int __init
early_init_dt_reserve_memory_arch(phys_addr_t base
, phys_addr_t size
,
54 reserve_bootmem(base
, size
, BOOTMEM_DEFAULT
);
58 void __init
early_init_devtree(void *params
)
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
) ==
64 params
= (void *)CONFIG_NIOS2_DTB_PHYS_ADDR
;
65 early_init_dt_scan(params
);
69 if (be32_to_cpu((__be32
) *dtb
) == OF_DT_HEADER
)
70 params
= (void *)__dtb_start
;
72 early_init_dt_scan(params
);
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
)
79 u64
*addr64
= (u64
*) data
;
82 /* only consider serial nodes */
83 if (strncmp(uname
, "serial", 6) != 0)
86 p
= of_get_flat_dt_prop(node
, "compatible", NULL
);
91 * We found an altera_jtaguart but it wasn't configured for console, so
94 #ifndef CONFIG_SERIAL_ALTERA_JTAGUART_CONSOLE
95 if (strncmp(p
, "altr,juart", 10) == 0)
100 * Same for altera_uart.
102 #ifndef CONFIG_SERIAL_ALTERA_UART_CONSOLE
103 if (strncmp(p
, "altr,uart", 9) == 0)
107 *addr64
= of_flat_dt_translate_address(node
);
109 return *addr64
== OF_BAD_ADDR
? 0 : 1;
112 unsigned long __init
of_early_console(void)
116 if (of_scan_flat_dt(early_init_dt_scan_serial
, &base
))
117 return (u32
)ioremap(base
, 32);
121 #endif /* CONFIG_EARLY_PRINTK */