1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 *
4 * Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
5 * Copyright (C) 2013 John Crispin <john@phrozen.org>
6 */
7
8 #include <linux/kernel.h>
9 #include <linux/init.h>
10 #include <linux/export.h>
11 #include <linux/clkdev.h>
12 #include <linux/clk.h>
13 #include <linux/clk-provider.h>
14 #include <asm/mach-ralink/ralink_regs.h>
15
16 #include <asm/time.h>
17
18 #include "common.h"
19
20 static const char *clk_cpu(int *idx)
21 {
22 switch (ralink_soc) {
23 case RT2880_SOC:
24 *idx = 0;
25 return "ralink,rt2880-sysc";
26 case RT3883_SOC:
27 *idx = 0;
28 return "ralink,rt3883-sysc";
29 case RT305X_SOC_RT3050:
30 *idx = 0;
31 return "ralink,rt3050-sysc";
32 case RT305X_SOC_RT3052:
33 *idx = 0;
34 return "ralink,rt3052-sysc";
35 case RT305X_SOC_RT3350:
36 *idx = 1;
37 return "ralink,rt3350-sysc";
38 case RT305X_SOC_RT3352:
39 *idx = 1;
40 return "ralink,rt3352-sysc";
41 case RT305X_SOC_RT5350:
42 *idx = 1;
43 return "ralink,rt5350-sysc";
44 case MT762X_SOC_MT7620A:
45 *idx = 2;
46 return "ralink,mt7620-sysc";
47 case MT762X_SOC_MT7620N:
48 *idx = 2;
49 return "ralink,mt7620-sysc";
50 case MT762X_SOC_MT7628AN:
51 *idx = 1;
52 return "ralink,mt7628-sysc";
53 case MT762X_SOC_MT7688:
54 *idx = 1;
55 return "ralink,mt7688-sysc";
56 default:
57 *idx = -1;
58 return "invalid";
59 }
60 }
61
62 void __init plat_time_init(void)
63 {
64 struct of_phandle_args clkspec;
65 const char *compatible;
66 struct clk *clk;
67 int cpu_clk_idx;
68
69 ralink_of_remap();
70
71 compatible = clk_cpu(&cpu_clk_idx);
72 if (cpu_clk_idx == -1)
73 panic("unable to get CPU clock index");
74
75 of_clk_init(NULL);
76 clkspec.np = of_find_compatible_node(NULL, NULL, compatible);
77 clkspec.args_count = 1;
78 clkspec.args[0] = cpu_clk_idx;
79 clk = of_clk_get_from_provider(&clkspec);
80 if (IS_ERR(clk))
81 panic("unable to get CPU clock, err=%ld", PTR_ERR(clk));
82 pr_info("CPU Clock: %ldMHz\n", clk_get_rate(clk) / 1000000);
83 mips_hpt_frequency = clk_get_rate(clk) / 2;
84 clk_put(clk);
85 timer_probe();
86 }
87
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