cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

owl-sps-helper.c (909B)

      1// SPDX-License-Identifier: GPL-2.0+
      2/*
      3 * Actions Semi Owl Smart Power System (SPS) shared helpers
      4 *
      5 * Copyright 2012 Actions Semi Inc.
      6 * Author: Actions Semi, Inc.
      7 *
      8 * Copyright (c) 2017 Andreas Färber
      9 */
     10
     11#include <linux/delay.h>
     12#include <linux/io.h>
     13#include <linux/soc/actions/owl-sps.h>
     14
     15#define OWL_SPS_PG_CTL	0x0
     16
     17int owl_sps_set_pg(void __iomem *base, u32 pwr_mask, u32 ack_mask, bool enable)
     18{
     19	u32 val;
     20	bool ack;
     21	int timeout;
     22
     23	val = readl(base + OWL_SPS_PG_CTL);
     24	ack = val & ack_mask;
     25	if (ack == enable)
     26		return 0;
     27
     28	if (enable)
     29		val |= pwr_mask;
     30	else
     31		val &= ~pwr_mask;
     32
     33	writel(val, base + OWL_SPS_PG_CTL);
     34
     35	for (timeout = 5000; timeout > 0; timeout -= 50) {
     36		val = readl(base + OWL_SPS_PG_CTL);
     37		if ((val & ack_mask) == (enable ? ack_mask : 0))
     38			break;
     39		udelay(50);
     40	}
     41	if (timeout <= 0)
     42		return -ETIMEDOUT;
     43
     44	udelay(10);
     45
     46	return 0;
     47}
     48EXPORT_SYMBOL_GPL(owl_sps_set_pg);