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999159a5 VG |
1 | /* |
2 | * Copyright (C) 2012 Synopsys, Inc. (www.synopsys.com) | |
3 | * | |
4 | * Based on reduced version of METAG | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
10 | ||
11 | ||
12 | #include <linux/init.h> | |
13 | #include <linux/reboot.h> | |
14 | #include <linux/memblock.h> | |
15 | #include <linux/of.h> | |
16 | #include <linux/of_fdt.h> | |
03a6d28c | 17 | #include <asm/mach_desc.h> |
999159a5 | 18 | |
091f56be | 19 | #ifdef CONFIG_SERIAL_EARLYCON |
ffb7fcd6 VG |
20 | |
21 | static unsigned int __initdata arc_base_baud; | |
22 | ||
23 | unsigned int __init arc_early_base_baud(void) | |
24 | { | |
25 | return arc_base_baud/16; | |
26 | } | |
27 | ||
28 | static void __init arc_set_early_base_baud(unsigned long dt_root) | |
29 | { | |
ffb7fcd6 | 30 | if (of_flat_dt_is_compatible(dt_root, "abilis,arc-tb10x")) |
0e6e9b64 | 31 | arc_base_baud = 166666666; /* Fixed 166.6MHz clk (TB10x) */ |
8d0d56ba | 32 | else if (of_flat_dt_is_compatible(dt_root, "snps,arc-sdp")) |
5fa2daaa | 33 | arc_base_baud = 33333333; /* Fixed 33MHz clk (AXS10x) */ |
19dbc762 NC |
34 | else if (of_flat_dt_is_compatible(dt_root, "ezchip,arc-nps")) |
35 | arc_base_baud = 800000000; /* Fixed 800MHz clk (NPS) */ | |
ffb7fcd6 | 36 | else |
0e6e9b64 | 37 | arc_base_baud = 50000000; /* Fixed default 50MHz */ |
ffb7fcd6 VG |
38 | } |
39 | #else | |
40 | #define arc_set_early_base_baud(dt_root) | |
41 | #endif | |
42 | ||
880beb88 RH |
43 | static const void * __init arch_get_next_mach(const char *const **match) |
44 | { | |
45 | static const struct machine_desc *mdesc = __arch_info_begin; | |
46 | const struct machine_desc *m = mdesc; | |
47 | ||
48 | if (m >= __arch_info_end) | |
49 | return NULL; | |
50 | ||
51 | mdesc++; | |
52 | *match = m->dt_compat; | |
53 | return m; | |
54 | } | |
55 | ||
999159a5 VG |
56 | /** |
57 | * setup_machine_fdt - Machine setup when an dtb was passed to the kernel | |
58 | * @dt: virtual address pointer to dt blob | |
59 | * | |
60 | * If a dtb was passed to the kernel, then use it to choose the correct | |
61 | * machine_desc and to setup the system. | |
62 | */ | |
880beb88 | 63 | const struct machine_desc * __init setup_machine_fdt(void *dt) |
999159a5 | 64 | { |
880beb88 | 65 | const struct machine_desc *mdesc; |
999159a5 | 66 | unsigned long dt_root; |
999159a5 | 67 | |
ad81fcb5 | 68 | if (!early_init_dt_scan(dt)) |
03a6d28c | 69 | return NULL; |
999159a5 | 70 | |
880beb88 RH |
71 | mdesc = of_flat_dt_match_machine(NULL, arch_get_next_mach); |
72 | if (!mdesc) | |
03a6d28c | 73 | machine_halt(); |
999159a5 | 74 | |
880beb88 | 75 | dt_root = of_get_flat_dt_root(); |
ffb7fcd6 VG |
76 | arc_set_early_base_baud(dt_root); |
77 | ||
880beb88 | 78 | return mdesc; |
999159a5 | 79 | } |