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/*
* Actions Semi Owl Smart Power System (SPS) shared helpers
*
* Copyright 2012 Actions Semi Inc.
* Author: Actions Semi, Inc.
*
* Copyright (c) 2017 Andreas Färber
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*/
#include <linux/delay.h>
#include <linux/io.h>
#define OWL_SPS_PG_CTL 0x0
int owl_sps_set_pg(void __iomem *base, u32 pwr_mask, u32 ack_mask, bool enable)
{
u32 val;
bool ack;
int timeout;
val = readl(base + OWL_SPS_PG_CTL);
ack = val & ack_mask;
if (ack == enable)
return 0;
if (enable)
val |= pwr_mask;
else
val &= ~pwr_mask;
writel(val, base + OWL_SPS_PG_CTL);
for (timeout = 5000; timeout > 0; timeout -= 50) {
val = readl(base + OWL_SPS_PG_CTL);
if ((val & ack_mask) == (enable ? ack_mask : 0))
break;
udelay(50);
}
if (timeout <= 0)
return -ETIMEDOUT;
udelay(10);
return 0;
}
EXPORT_SYMBOL_GPL(owl_sps_set_pg);
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