1 // SPDX-License-Identifier: GPL-2.0 2 // 3 // Spreadtrum divider clock driver 4 // 5 // Copyright (C) 2017 Spreadtrum, Inc. 6 // Author: Chunyan Zhang <chunyan.zhang@spreadtrum.com> 7 8 #include <linux/clk-provider.h> 9 10 #include "div.h" 11 12 static int sprd_div_determine_rate(struct clk_hw *hw, 13 struct clk_rate_request *req) 14 { 15 struct sprd_div *cd = hw_to_sprd_div(hw); 16 17 req->rate = divider_round_rate(&cd->common.hw, req->rate, 18 &req->best_parent_rate, 19 NULL, cd->div.width, 0); 20 21 return 0; 22 } 23 24 unsigned long sprd_div_helper_recalc_rate(struct sprd_clk_common *common, 25 const struct sprd_div_internal *div, 26 unsigned long parent_rate) 27 { 28 unsigned long val; 29 unsigned int reg; 30 31 regmap_read(common->regmap, common->reg + div->offset, ®); 32 val = reg >> div->shift; 33 val &= (1 << div->width) - 1; 34 35 return divider_recalc_rate(&common->hw, parent_rate, val, NULL, 0, 36 div->width); 37 } 38 EXPORT_SYMBOL_GPL(sprd_div_helper_recalc_rate); 39 40 static unsigned long sprd_div_recalc_rate(struct clk_hw *hw, 41 unsigned long parent_rate) 42 { 43 struct sprd_div *cd = hw_to_sprd_div(hw); 44 45 return sprd_div_helper_recalc_rate(&cd->common, &cd->div, parent_rate); 46 } 47 48 int sprd_div_helper_set_rate(const struct sprd_clk_common *common, 49 const struct sprd_div_internal *div, 50 unsigned long rate, 51 unsigned long parent_rate) 52 { 53 unsigned long val; 54 unsigned int reg; 55 56 val = divider_get_val(rate, parent_rate, NULL, 57 div->width, 0); 58 59 regmap_read(common->regmap, common->reg + div->offset, ®); 60 reg &= ~GENMASK(div->width + div->shift - 1, div->shift); 61 62 regmap_write(common->regmap, common->reg + div->offset, 63 reg | (val << div->shift)); 64 65 return 0; 66 67 } 68 EXPORT_SYMBOL_GPL(sprd_div_helper_set_rate); 69 70 static int sprd_div_set_rate(struct clk_hw *hw, unsigned long rate, 71 unsigned long parent_rate) 72 { 73 struct sprd_div *cd = hw_to_sprd_div(hw); 74 75 return sprd_div_helper_set_rate(&cd->common, &cd->div, 76 rate, parent_rate); 77 } 78 79 const struct clk_ops sprd_div_ops = { 80 .recalc_rate = sprd_div_recalc_rate, 81 .determine_rate = sprd_div_determine_rate, 82 .set_rate = sprd_div_set_rate, 83 }; 84 EXPORT_SYMBOL_GPL(sprd_div_ops); 85