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48 lines
909 B
48 lines
909 B
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* Actions Semi Owl Smart Power System (SPS) shared helpers |
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* |
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* Copyright 2012 Actions Semi Inc. |
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* Author: Actions Semi, Inc. |
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* |
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* Copyright (c) 2017 Andreas Färber |
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*/ |
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#include <linux/delay.h> |
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#include <linux/io.h> |
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#include <linux/soc/actions/owl-sps.h> |
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#define OWL_SPS_PG_CTL 0x0 |
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int owl_sps_set_pg(void __iomem *base, u32 pwr_mask, u32 ack_mask, bool enable) |
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{ |
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u32 val; |
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bool ack; |
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int timeout; |
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val = readl(base + OWL_SPS_PG_CTL); |
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ack = val & ack_mask; |
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if (ack == enable) |
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return 0; |
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if (enable) |
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val |= pwr_mask; |
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else |
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val &= ~pwr_mask; |
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writel(val, base + OWL_SPS_PG_CTL); |
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for (timeout = 5000; timeout > 0; timeout -= 50) { |
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val = readl(base + OWL_SPS_PG_CTL); |
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if ((val & ack_mask) == (enable ? ack_mask : 0)) |
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break; |
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udelay(50); |
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} |
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if (timeout <= 0) |
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return -ETIMEDOUT; |
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udelay(10); |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(owl_sps_set_pg);
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