linux/arch/mips/loongson64/time.c
Qing Zhang 95b56e884a MIPS: Loongson64: Add support for the Loongson-2K1000 to get cpu_clock_freq
Get the fixed-clock from the CPU0 node of the device tree.

Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Qing Zhang <zhangqing@loongson.cn>
Tested-by: Ming Wang <wangming01@loongson.cn>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
2021-03-25 10:44:01 +01:00

48 lines
929 B
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2007 Lemote, Inc. & Institute of Computing Technology
* Author: Fuxin Zhang, zhangfx@lemote.com
*
* Copyright (C) 2009 Lemote Inc.
* Author: Wu Zhangjin, wuzhangjin@gmail.com
*/
#include <asm/time.h>
#include <asm/hpet.h>
#include <loongson.h>
#include <linux/clk.h>
#include <linux/of_clk.h>
void __init plat_time_init(void)
{
struct clk *clk;
struct device_node *np;
if (loongson_sysconf.fw_interface == LOONGSON_DTB) {
of_clk_init(NULL);
np = of_get_cpu_node(0, NULL);
if (!np) {
pr_err("Failed to get CPU node\n");
return;
}
clk = of_clk_get(np, 0);
if (IS_ERR(clk)) {
pr_err("Failed to get CPU clock: %ld\n", PTR_ERR(clk));
return;
}
cpu_clock_freq = clk_get_rate(clk);
clk_put(clk);
}
/* setup mips r4k timer */
mips_hpt_frequency = cpu_clock_freq / 2;
#ifdef CONFIG_RS780_HPET
setup_hpet_timer();
#endif
}