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Linux kernel mirror (for testing)
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linux
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);