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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mpc5xxx_clocks.c (731B)

      1// SPDX-License-Identifier: GPL-2.0
      2/**
      3 * 	mpc5xxx_get_bus_frequency - Find the bus frequency for a device
      4 * 	@node:	device node
      5 *
      6 * 	Returns bus frequency (IPS on MPC512x, IPB on MPC52xx),
      7 * 	or 0 if the bus frequency cannot be found.
      8 */
      9
     10#include <linux/kernel.h>
     11#include <linux/of_platform.h>
     12#include <linux/export.h>
     13#include <asm/mpc5xxx.h>
     14
     15unsigned long mpc5xxx_get_bus_frequency(struct device_node *node)
     16{
     17	const unsigned int *p_bus_freq = NULL;
     18
     19	of_node_get(node);
     20	while (node) {
     21		p_bus_freq = of_get_property(node, "bus-frequency", NULL);
     22		if (p_bus_freq)
     23			break;
     24
     25		node = of_get_next_parent(node);
     26	}
     27	of_node_put(node);
     28
     29	return p_bus_freq ? *p_bus_freq : 0;
     30}
     31EXPORT_SYMBOL(mpc5xxx_get_bus_frequency);