LXR linux/arch/mips/loongson64/time.c

   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
  17void __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