9c92ab6191
Based on 1 normalized pattern(s): this software is licensed under the terms of the gnu general public license version 2 as published by the free software foundation and may be copied distributed and modified under those terms this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 285 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190529141900.642774971@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
64 lines
1.6 KiB
C
64 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2017 Chen-Yu Tsai. All rights reserved.
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*/
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#include <linux/clk-provider.h>
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#include <linux/clk/sunxi-ng.h>
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#include <linux/io.h>
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#include "ccu_common.h"
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/**
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* sunxi_ccu_set_mmc_timing_mode: Configure the MMC clock timing mode
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* @clk: clock to be configured
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* @new_mode: true for new timing mode introduced in A83T and later
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*
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* Returns 0 on success, -ENOTSUPP if the clock does not support
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* switching modes.
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*/
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int sunxi_ccu_set_mmc_timing_mode(struct clk *clk, bool new_mode)
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{
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struct clk_hw *hw = __clk_get_hw(clk);
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struct ccu_common *cm = hw_to_ccu_common(hw);
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unsigned long flags;
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u32 val;
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if (!(cm->features & CCU_FEATURE_MMC_TIMING_SWITCH))
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return -ENOTSUPP;
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spin_lock_irqsave(cm->lock, flags);
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val = readl(cm->base + cm->reg);
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if (new_mode)
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val |= CCU_MMC_NEW_TIMING_MODE;
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else
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val &= ~CCU_MMC_NEW_TIMING_MODE;
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writel(val, cm->base + cm->reg);
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spin_unlock_irqrestore(cm->lock, flags);
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return 0;
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}
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EXPORT_SYMBOL_GPL(sunxi_ccu_set_mmc_timing_mode);
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/**
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* sunxi_ccu_set_mmc_timing_mode: Get the current MMC clock timing mode
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* @clk: clock to query
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*
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* Returns 0 if the clock is in old timing mode, > 0 if it is in
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* new timing mode, and -ENOTSUPP if the clock does not support
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* this function.
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*/
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int sunxi_ccu_get_mmc_timing_mode(struct clk *clk)
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{
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struct clk_hw *hw = __clk_get_hw(clk);
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struct ccu_common *cm = hw_to_ccu_common(hw);
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if (!(cm->features & CCU_FEATURE_MMC_TIMING_SWITCH))
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return -ENOTSUPP;
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return !!(readl(cm->base + cm->reg) & CCU_MMC_NEW_TIMING_MODE);
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}
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EXPORT_SYMBOL_GPL(sunxi_ccu_get_mmc_timing_mode);
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