1 /* 2 * Copyright (c) 2017 Chen-Yu Tsai. All rights reserved. 3 * 4 * This software is licensed under the terms of the GNU General Public 5 * License version 2, as published by the Free Software Foundation, and 6 * may be copied, distributed, and modified under those terms. 7 * 8 * This program is distributed in the hope that it will be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 * GNU General Public License for more details. 12 */ 13 14 #include <linux/clk-provider.h> 15 #include <linux/clk/sunxi-ng.h> 16 17 #include "ccu_common.h" 18 19 /** 20 * sunxi_ccu_set_mmc_timing_mode: Configure the MMC clock timing mode 21 * @clk: clock to be configured 22 * @new_mode: true for new timing mode introduced in A83T and later 23 * 24 * Returns 0 on success, -ENOTSUPP if the clock does not support 25 * switching modes. 26 */ 27 int sunxi_ccu_set_mmc_timing_mode(struct clk *clk, bool new_mode) 28 { 29 struct clk_hw *hw = __clk_get_hw(clk); 30 struct ccu_common *cm = hw_to_ccu_common(hw); 31 unsigned long flags; 32 u32 val; 33 34 if (!(cm->features & CCU_FEATURE_MMC_TIMING_SWITCH)) 35 return -ENOTSUPP; 36 37 spin_lock_irqsave(cm->lock, flags); 38 39 val = readl(cm->base + cm->reg); 40 if (new_mode) 41 val |= CCU_MMC_NEW_TIMING_MODE; 42 else 43 val &= ~CCU_MMC_NEW_TIMING_MODE; 44 writel(val, cm->base + cm->reg); 45 46 spin_unlock_irqrestore(cm->lock, flags); 47 48 return 0; 49 } 50 EXPORT_SYMBOL_GPL(sunxi_ccu_set_mmc_timing_mode); 51 52 /** 53 * sunxi_ccu_set_mmc_timing_mode: Get the current MMC clock timing mode 54 * @clk: clock to query 55 * 56 * Returns 0 if the clock is in old timing mode, > 0 if it is in 57 * new timing mode, and -ENOTSUPP if the clock does not support 58 * this function. 59 */ 60 int sunxi_ccu_get_mmc_timing_mode(struct clk *clk) 61 { 62 struct clk_hw *hw = __clk_get_hw(clk); 63 struct ccu_common *cm = hw_to_ccu_common(hw); 64 65 if (!(cm->features & CCU_FEATURE_MMC_TIMING_SWITCH)) 66 return -ENOTSUPP; 67 68 return !!(readl(cm->base + cm->reg) & CCU_MMC_NEW_TIMING_MODE); 69 } 70 EXPORT_SYMBOL_GPL(sunxi_ccu_get_mmc_timing_mode); 71