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 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