72 lines
2.0 KiB
C
72 lines
2.0 KiB
C
/*
|
|
* Copyright (c) 2017 Chen-Yu Tsai. All rights reserved.
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#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
|
|
*
|
|
* Returns 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_set_mmc_timing_mode: Get the current MMC clock timing mode
|
|
* @clk: clock to query
|
|
*
|
|
* Returns 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);
|