cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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timer.c (853B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * SH-Mobile Timer
      4 *
      5 * Copyright (C) 2010  Magnus Damm
      6 * Copyright (C) 2002 - 2009  Paul Mundt
      7 */
      8#include <linux/platform_device.h>
      9#include <linux/clocksource.h>
     10#include <linux/delay.h>
     11#include <linux/of_address.h>
     12
     13#include "common.h"
     14
     15void __init shmobile_init_delay(void)
     16{
     17	struct device_node *np;
     18	u32 max_freq = 0;
     19
     20	for_each_of_cpu_node(np) {
     21		u32 freq;
     22
     23		if (!of_property_read_u32(np, "clock-frequency", &freq))
     24			max_freq = max(max_freq, freq);
     25	}
     26
     27	if (!max_freq)
     28		return;
     29
     30	/*
     31	 * Calculate a worst-case loops-per-jiffy value
     32	 * based on maximum cpu core hz setting and the
     33	 * __delay() implementation in arch/arm/lib/delay.S.
     34	 *
     35	 * This will result in a longer delay than expected
     36	 * when the cpu core runs on lower frequencies.
     37	 */
     38
     39	if (!preset_lpj)
     40		preset_lpj = max_freq / HZ;
     41}