1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Copyright (C) 2007 Lemote, Inc. & Institute of Computing Technology
4  * Author: Fuxin Zhang, zhangfx@lemote.com
5  *
6  * Copyright (C) 2009 Lemote Inc.
7  * Author: Wu Zhangjin, wuzhangjin@gmail.com
8  */
9 
10 #include <asm/time.h>
11 #include <asm/hpet.h>
12 
13 #include <loongson.h>
14 #include <linux/clk.h>
15 #include <linux/of_clk.h>
16 
plat_time_init(void)17 void __init plat_time_init(void)
18 {
19 	struct clk *clk;
20 	struct device_node *np;
21 
22 	if (loongson_sysconf.fw_interface == LOONGSON_DTB) {
23 		of_clk_init(NULL);
24 
25 		np = of_get_cpu_node(0, NULL);
26 		if (!np) {
27 			pr_err("Failed to get CPU node\n");
28 			return;
29 		}
30 
31 		clk = of_clk_get(np, 0);
32 		if (IS_ERR(clk)) {
33 			pr_err("Failed to get CPU clock: %ld\n", PTR_ERR(clk));
34 			return;
35 		}
36 
37 		cpu_clock_freq = clk_get_rate(clk);
38 		clk_put(clk);
39 	}
40 
41 	/* setup mips r4k timer */
42 	mips_hpt_frequency = cpu_clock_freq / 2;
43 
44 #ifdef CONFIG_RS780_HPET
45 	setup_hpet_timer();
46 #endif
47 }
48