1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2014, The Linux Foundation. All rights reserved. 4 */ 5 6 #include <linux/kernel.h> 7 #include <linux/bitops.h> 8 #include <linux/regmap.h> 9 #include <linux/export.h> 10 11 #include "clk-regmap-divider.h" 12 13 static inline struct clk_regmap_div *to_clk_regmap_div(struct clk_hw *hw) 14 { 15 return container_of(to_clk_regmap(hw), struct clk_regmap_div, clkr); 16 } 17 18 static long div_round_ro_rate(struct clk_hw *hw, unsigned long rate, 19 unsigned long *prate) 20 { 21 struct clk_regmap_div *divider = to_clk_regmap_div(hw); 22 struct clk_regmap *clkr = ÷r->clkr; 23 u32 val; 24 25 regmap_read(clkr->regmap, divider->reg, &val); 26 val >>= divider->shift; 27 val &= BIT(divider->width) - 1; 28 29 return divider_ro_round_rate(hw, rate, prate, NULL, divider->width, 30 CLK_DIVIDER_ROUND_CLOSEST, val); 31 } 32 33 static long div_round_rate(struct clk_hw *hw, unsigned long rate, 34 unsigned long *prate) 35 { 36 struct clk_regmap_div *divider = to_clk_regmap_div(hw); 37 38 return divider_round_rate(hw, rate, prate, NULL, divider->width, 39 CLK_DIVIDER_ROUND_CLOSEST); 40 } 41 42 static int div_set_rate(struct clk_hw *hw, unsigned long rate, 43 unsigned long parent_rate) 44 { 45 struct clk_regmap_div *divider = to_clk_regmap_div(hw); 46 struct clk_regmap *clkr = ÷r->clkr; 47 u32 div; 48 49 div = divider_get_val(rate, parent_rate, NULL, divider->width, 50 CLK_DIVIDER_ROUND_CLOSEST); 51 52 return regmap_update_bits(clkr->regmap, divider->reg, 53 (BIT(divider->width) - 1) << divider->shift, 54 div << divider->shift); 55 } 56 57 static unsigned long div_recalc_rate(struct clk_hw *hw, 58 unsigned long parent_rate) 59 { 60 struct clk_regmap_div *divider = to_clk_regmap_div(hw); 61 struct clk_regmap *clkr = ÷r->clkr; 62 u32 div; 63 64 regmap_read(clkr->regmap, divider->reg, &div); 65 div >>= divider->shift; 66 div &= BIT(divider->width) - 1; 67 68 return divider_recalc_rate(hw, parent_rate, div, NULL, 69 CLK_DIVIDER_ROUND_CLOSEST, divider->width); 70 } 71 72 const struct clk_ops clk_regmap_div_ops = { 73 .round_rate = div_round_rate, 74 .set_rate = div_set_rate, 75 .recalc_rate = div_recalc_rate, 76 }; 77 EXPORT_SYMBOL_GPL(clk_regmap_div_ops); 78 79 const struct clk_ops clk_regmap_div_ro_ops = { 80 .round_rate = div_round_ro_rate, 81 .recalc_rate = div_recalc_rate, 82 }; 83 EXPORT_SYMBOL_GPL(clk_regmap_div_ro_ops); 84