95 lines · c
1// SPDX-License-Identifier: GPL-2.0+2//3// OWL divider clock driver4//5// Copyright (c) 2014 Actions Semi Inc.6// Author: David Liu <liuwei@actions-semi.com>7//8// Copyright (c) 2018 Linaro Ltd.9// Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>10 11#include <linux/clk-provider.h>12#include <linux/regmap.h>13 14#include "owl-divider.h"15 16long owl_divider_helper_round_rate(struct owl_clk_common *common,17 const struct owl_divider_hw *div_hw,18 unsigned long rate,19 unsigned long *parent_rate)20{21 return divider_round_rate(&common->hw, rate, parent_rate,22 div_hw->table, div_hw->width,23 div_hw->div_flags);24}25 26static long owl_divider_round_rate(struct clk_hw *hw, unsigned long rate,27 unsigned long *parent_rate)28{29 struct owl_divider *div = hw_to_owl_divider(hw);30 31 return owl_divider_helper_round_rate(&div->common, &div->div_hw,32 rate, parent_rate);33}34 35unsigned long owl_divider_helper_recalc_rate(struct owl_clk_common *common,36 const struct owl_divider_hw *div_hw,37 unsigned long parent_rate)38{39 unsigned long val;40 unsigned int reg;41 42 regmap_read(common->regmap, div_hw->reg, ®);43 val = reg >> div_hw->shift;44 val &= (1 << div_hw->width) - 1;45 46 return divider_recalc_rate(&common->hw, parent_rate,47 val, div_hw->table,48 div_hw->div_flags,49 div_hw->width);50}51 52static unsigned long owl_divider_recalc_rate(struct clk_hw *hw,53 unsigned long parent_rate)54{55 struct owl_divider *div = hw_to_owl_divider(hw);56 57 return owl_divider_helper_recalc_rate(&div->common,58 &div->div_hw, parent_rate);59}60 61int owl_divider_helper_set_rate(const struct owl_clk_common *common,62 const struct owl_divider_hw *div_hw,63 unsigned long rate,64 unsigned long parent_rate)65{66 unsigned long val;67 unsigned int reg;68 69 val = divider_get_val(rate, parent_rate, div_hw->table,70 div_hw->width, 0);71 72 regmap_read(common->regmap, div_hw->reg, ®);73 reg &= ~GENMASK(div_hw->width + div_hw->shift - 1, div_hw->shift);74 75 regmap_write(common->regmap, div_hw->reg,76 reg | (val << div_hw->shift));77 78 return 0;79}80 81static int owl_divider_set_rate(struct clk_hw *hw, unsigned long rate,82 unsigned long parent_rate)83{84 struct owl_divider *div = hw_to_owl_divider(hw);85 86 return owl_divider_helper_set_rate(&div->common, &div->div_hw,87 rate, parent_rate);88}89 90const struct clk_ops owl_divider_ops = {91 .recalc_rate = owl_divider_recalc_rate,92 .round_rate = owl_divider_round_rate,93 .set_rate = owl_divider_set_rate,94};95