// 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);