1 /* 2 * Copyright (c) 2014, The Linux Foundation. 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/kernel.h> 15 #include <linux/bitops.h> 16 #include <linux/regmap.h> 17 #include <linux/export.h> 18 19 #include "clk-regmap-divider.h" 20 21 static inline struct clk_regmap_div *to_clk_regmap_div(struct clk_hw *hw) 22 { 23 return container_of(to_clk_regmap(hw), struct clk_regmap_div, clkr); 24 } 25 26 static long div_round_rate(struct clk_hw *hw, unsigned long rate, 27 unsigned long *prate) 28 { 29 struct clk_regmap_div *divider = to_clk_regmap_div(hw); 30 31 return divider_round_rate(hw, rate, prate, NULL, divider->width, 32 CLK_DIVIDER_ROUND_CLOSEST); 33 } 34 35 static int div_set_rate(struct clk_hw *hw, unsigned long rate, 36 unsigned long parent_rate) 37 { 38 struct clk_regmap_div *divider = to_clk_regmap_div(hw); 39 struct clk_regmap *clkr = ÷r->clkr; 40 u32 div; 41 42 div = divider_get_val(rate, parent_rate, NULL, divider->width, 43 CLK_DIVIDER_ROUND_CLOSEST); 44 45 return regmap_update_bits(clkr->regmap, divider->reg, 46 (BIT(divider->width) - 1) << divider->shift, 47 div << divider->shift); 48 } 49 50 static unsigned long div_recalc_rate(struct clk_hw *hw, 51 unsigned long parent_rate) 52 { 53 struct clk_regmap_div *divider = to_clk_regmap_div(hw); 54 struct clk_regmap *clkr = ÷r->clkr; 55 u32 div; 56 57 regmap_read(clkr->regmap, divider->reg, &div); 58 div >>= divider->shift; 59 div &= BIT(divider->width) - 1; 60 61 return divider_recalc_rate(hw, parent_rate, div, NULL, 62 CLK_DIVIDER_ROUND_CLOSEST); 63 } 64 65 const struct clk_ops clk_regmap_div_ops = { 66 .round_rate = div_round_rate, 67 .set_rate = div_set_rate, 68 .recalc_rate = div_recalc_rate, 69 }; 70 EXPORT_SYMBOL_GPL(clk_regmap_div_ops); 71