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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright (c) 2017 Chen-Yu Tsai. All rights reserved.4 */5 6#include <linux/clk-provider.h>7#include <linux/clk/sunxi-ng.h>8#include <linux/io.h>9 10#include "ccu_common.h"11 12/**13 * sunxi_ccu_set_mmc_timing_mode - Configure the MMC clock timing mode14 * @clk: clock to be configured15 * @new_mode: true for new timing mode introduced in A83T and later16 *17 * Return: %0 on success, %-ENOTSUPP if the clock does not support18 * switching modes.19 */20int sunxi_ccu_set_mmc_timing_mode(struct clk *clk, bool new_mode)21{22 struct clk_hw *hw = __clk_get_hw(clk);23 struct ccu_common *cm = hw_to_ccu_common(hw);24 unsigned long flags;25 u32 val;26 27 if (!(cm->features & CCU_FEATURE_MMC_TIMING_SWITCH))28 return -ENOTSUPP;29 30 spin_lock_irqsave(cm->lock, flags);31 32 val = readl(cm->base + cm->reg);33 if (new_mode)34 val |= CCU_MMC_NEW_TIMING_MODE;35 else36 val &= ~CCU_MMC_NEW_TIMING_MODE;37 writel(val, cm->base + cm->reg);38 39 spin_unlock_irqrestore(cm->lock, flags);40 41 return 0;42}43EXPORT_SYMBOL_GPL(sunxi_ccu_set_mmc_timing_mode);44 45/**46 * sunxi_ccu_get_mmc_timing_mode: Get the current MMC clock timing mode47 * @clk: clock to query48 *49 * Return: %0 if the clock is in old timing mode, > %0 if it is in50 * new timing mode, and %-ENOTSUPP if the clock does not support51 * this function.52 */53int sunxi_ccu_get_mmc_timing_mode(struct clk *clk)54{55 struct clk_hw *hw = __clk_get_hw(clk);56 struct ccu_common *cm = hw_to_ccu_common(hw);57 58 if (!(cm->features & CCU_FEATURE_MMC_TIMING_SWITCH))59 return -ENOTSUPP;60 61 return !!(readl(cm->base + cm->reg) & CCU_MMC_NEW_TIMING_MODE);62}63EXPORT_SYMBOL_GPL(sunxi_ccu_get_mmc_timing_mode);64