mirror of
https://github.com/torvalds/linux.git
synced 2024-12-05 10:32:35 +00:00
afe518272d
Replace textual license notices with SPDX-License-Identifier lines. Add an SPDX-License-Identifier for the Makefile. Signed-off-by: Andreas Färber <afaerber@suse.de>
48 lines
870 B
C
48 lines
870 B
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Actions Semi Owl Smart Power System (SPS) shared helpers
|
|
*
|
|
* Copyright 2012 Actions Semi Inc.
|
|
* Author: Actions Semi, Inc.
|
|
*
|
|
* Copyright (c) 2017 Andreas Färber
|
|
*/
|
|
|
|
#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);
|