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
14#define OWL_SPS_PG_CTL	0x0
15
16int owl_sps_set_pg(void __iomem *base, u32 pwr_mask, u32 ack_mask, bool enable)
17{
18	u32 val;
19	bool ack;
20	int timeout;
21
22	val = readl(base + OWL_SPS_PG_CTL);
23	ack = val & ack_mask;
24	if (ack == enable)
25		return 0;
26
27	if (enable)
28		val |= pwr_mask;
29	else
30		val &= ~pwr_mask;
31
32	writel(val, base + OWL_SPS_PG_CTL);
33
34	for (timeout = 5000; timeout > 0; timeout -= 50) {
35		val = readl(base + OWL_SPS_PG_CTL);
36		if ((val & ack_mask) == (enable ? ack_mask : 0))
37			break;
38		udelay(50);
39	}
40	if (timeout <= 0)
41		return -ETIMEDOUT;
42
43	udelay(10);
44
45	return 0;
46}
47EXPORT_SYMBOL_GPL(owl_sps_set_pg);