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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> | |
450dd430 | 17 | #include <asm/clk.h> |
03a6d28c | 18 | #include <asm/mach_desc.h> |
999159a5 | 19 | |
091f56be | 20 | #ifdef CONFIG_SERIAL_EARLYCON |
ffb7fcd6 VG |
21 | |
22 | static unsigned int __initdata arc_base_baud; | |
23 | ||
24 | unsigned int __init arc_early_base_baud(void) | |
25 | { | |
26 | return arc_base_baud/16; | |
27 | } | |
28 | ||
29 | static void __init arc_set_early_base_baud(unsigned long dt_root) | |
30 | { | |
31 | unsigned int core_clk = arc_get_core_freq(); | |
32 | ||
33 | if (of_flat_dt_is_compatible(dt_root, "abilis,arc-tb10x")) | |
34 | arc_base_baud = core_clk/3; | |
8d0d56ba | 35 | else if (of_flat_dt_is_compatible(dt_root, "snps,arc-sdp")) |
5fa2daaa | 36 | arc_base_baud = 33333333; /* Fixed 33MHz clk (AXS10x) */ |
ffb7fcd6 VG |
37 | else |
38 | arc_base_baud = core_clk; | |
39 | } | |
40 | #else | |
41 | #define arc_set_early_base_baud(dt_root) | |
42 | #endif | |
43 | ||
880beb88 RH |
44 | static const void * __init arch_get_next_mach(const char *const **match) |
45 | { | |
46 | static const struct machine_desc *mdesc = __arch_info_begin; | |
47 | const struct machine_desc *m = mdesc; | |
48 | ||
49 | if (m >= __arch_info_end) | |
50 | return NULL; | |
51 | ||
52 | mdesc++; | |
53 | *match = m->dt_compat; | |
54 | return m; | |
55 | } | |
56 | ||
999159a5 VG |
57 | /** |
58 | * setup_machine_fdt - Machine setup when an dtb was passed to the kernel | |
59 | * @dt: virtual address pointer to dt blob | |
60 | * | |
61 | * If a dtb was passed to the kernel, then use it to choose the correct | |
62 | * machine_desc and to setup the system. | |
63 | */ | |
880beb88 | 64 | const struct machine_desc * __init setup_machine_fdt(void *dt) |
999159a5 | 65 | { |
880beb88 | 66 | const struct machine_desc *mdesc; |
999159a5 | 67 | unsigned long dt_root; |
760ecbc7 | 68 | const void *clk; |
9d0c4dfe | 69 | int len; |
999159a5 | 70 | |
ad81fcb5 | 71 | if (!early_init_dt_scan(dt)) |
03a6d28c | 72 | return NULL; |
999159a5 | 73 | |
880beb88 RH |
74 | mdesc = of_flat_dt_match_machine(NULL, arch_get_next_mach); |
75 | if (!mdesc) | |
03a6d28c | 76 | machine_halt(); |
999159a5 | 77 | |
880beb88 | 78 | dt_root = of_get_flat_dt_root(); |
450dd430 VG |
79 | clk = of_get_flat_dt_prop(dt_root, "clock-frequency", &len); |
80 | if (clk) | |
81 | arc_set_core_freq(of_read_ulong(clk, len/4)); | |
82 | ||
ffb7fcd6 VG |
83 | arc_set_early_base_baud(dt_root); |
84 | ||
880beb88 | 85 | return mdesc; |
999159a5 | 86 | } |