// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright ( c ) 2017 Chen - Yu Tsai . All rights reserved .
*/
#include <linux/clk-provider.h>
#include <linux/clk/sunxi-ng.h>
#include <linux/io.h>
#include "ccu_common.h"
/**
* sunxi_ccu_set_mmc_timing_mode - Configure the MMC clock timing mode
* @ clk : clock to be configured
* @ new_mode : true for new timing mode introduced in A83T and later
*
* Return : % 0 on success , % - ENOTSUPP if the clock does not support
* switching modes .
*/
int sunxi_ccu_set_mmc_timing_mode(struct clk *clk, bool new_mode)
{
struct clk_hw *hw = __clk_get_hw(clk);
struct ccu_common *cm = hw_to_ccu_common(hw);
unsigned long flags;
u32 val;
if (!(cm->features & CCU_FEATURE_MMC_TIMING_SWITCH))
return -ENOTSUPP;
spin_lock_irqsave(cm->lock, flags);
val = readl(cm->base + cm->reg);
if (new_mode)
val |= CCU_MMC_NEW_TIMING_MODE;
else
val &= ~CCU_MMC_NEW_TIMING_MODE;
writel(val, cm->base + cm->reg);
spin_unlock_irqrestore(cm->lock, flags);
return 0 ;
}
EXPORT_SYMBOL_GPL(sunxi_ccu_set_mmc_timing_mode);
/**
* sunxi_ccu_get_mmc_timing_mode : Get the current MMC clock timing mode
* @ clk : clock to query
*
* Return : % 0 if the clock is in old timing mode , > % 0 if it is in
* new timing mode , and % - ENOTSUPP if the clock does not support
* this function .
*/
int sunxi_ccu_get_mmc_timing_mode(struct clk *clk)
{
struct clk_hw *hw = __clk_get_hw(clk);
struct ccu_common *cm = hw_to_ccu_common(hw);
if (!(cm->features & CCU_FEATURE_MMC_TIMING_SWITCH))
return -ENOTSUPP;
return !!(readl(cm->base + cm->reg) & CCU_MMC_NEW_TIMING_MODE);
}
EXPORT_SYMBOL_GPL(sunxi_ccu_get_mmc_timing_mode);
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