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 
17 int 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 }
48 EXPORT_SYMBOL_GPL(owl_sps_set_pg);
49