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 #include <linux/io.h> 17 18 #include "ccu_common.h" 19 20 /** 21 * sunxi_ccu_set_mmc_timing_mode: Configure the MMC clock timing mode 22 * @clk: clock to be configured 23 * @new_mode: true for new timing mode introduced in A83T and later 24 * 25 * Returns 0 on success, -ENOTSUPP if the clock does not support 26 * switching modes. 27 */ 28 int sunxi_ccu_set_mmc_timing_mode(struct clk *clk, bool new_mode) 29 { 30 struct clk_hw *hw = __clk_get_hw(clk); 31 struct ccu_common *cm = hw_to_ccu_common(hw); 32 unsigned long flags; 33 u32 val; 34 35 if (!(cm->features & CCU_FEATURE_MMC_TIMING_SWITCH)) 36 return -ENOTSUPP; 37 38 spin_lock_irqsave(cm->lock, flags); 39 40 val = readl(cm->base + cm->reg); 41 if (new_mode) 42 val |= CCU_MMC_NEW_TIMING_MODE; 43 else 44 val &= ~CCU_MMC_NEW_TIMING_MODE; 45 writel(val, cm->base + cm->reg); 46 47 spin_unlock_irqrestore(cm->lock, flags); 48 49 return 0; 50 } 51 EXPORT_SYMBOL_GPL(sunxi_ccu_set_mmc_timing_mode); 52 53 /** 54 * sunxi_ccu_set_mmc_timing_mode: Get the current MMC clock timing mode 55 * @clk: clock to query 56 * 57 * Returns 0 if the clock is in old timing mode, > 0 if it is in 58 * new timing mode, and -ENOTSUPP if the clock does not support 59 * this function. 60 */ 61 int sunxi_ccu_get_mmc_timing_mode(struct clk *clk) 62 { 63 struct clk_hw *hw = __clk_get_hw(clk); 64 struct ccu_common *cm = hw_to_ccu_common(hw); 65 66 if (!(cm->features & CCU_FEATURE_MMC_TIMING_SWITCH)) 67 return -ENOTSUPP; 68 69 return !!(readl(cm->base + cm->reg) & CCU_MMC_NEW_TIMING_MODE); 70 } 71 EXPORT_SYMBOL_GPL(sunxi_ccu_get_mmc_timing_mode); 72