1 /* 2 * Copyright (C) 2016 Maxime Ripard 3 * Maxime Ripard <maxime.ripard@free-electrons.com> 4 * 5 * This program is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU General Public License as 7 * published by the Free Software Foundation; either version 2 of 8 * the License, or (at your option) any later version. 9 */ 10 11 #include <linux/clk-provider.h> 12 13 #include "ccu_gate.h" 14 #include "ccu_mult.h" 15 16 struct _ccu_mult { 17 unsigned long mult, min, max; 18 }; 19 20 static void ccu_mult_find_best(unsigned long parent, unsigned long rate, 21 struct _ccu_mult *mult) 22 { 23 int _mult; 24 25 _mult = rate / parent; 26 if (_mult < mult->min) 27 _mult = mult->min; 28 29 if (_mult > mult->max) 30 _mult = mult->max; 31 32 mult->mult = _mult; 33 } 34 35 static unsigned long ccu_mult_round_rate(struct ccu_mux_internal *mux, 36 struct clk_hw *parent, 37 unsigned long *parent_rate, 38 unsigned long rate, 39 void *data) 40 { 41 struct ccu_mult *cm = data; 42 struct _ccu_mult _cm; 43 44 _cm.min = cm->mult.min; 45 46 if (cm->mult.max) 47 _cm.max = cm->mult.max; 48 else 49 _cm.max = (1 << cm->mult.width) + cm->mult.offset - 1; 50 51 ccu_mult_find_best(*parent_rate, rate, &_cm); 52 53 return *parent_rate * _cm.mult; 54 } 55 56 static void ccu_mult_disable(struct clk_hw *hw) 57 { 58 struct ccu_mult *cm = hw_to_ccu_mult(hw); 59 60 return ccu_gate_helper_disable(&cm->common, cm->enable); 61 } 62 63 static int ccu_mult_enable(struct clk_hw *hw) 64 { 65 struct ccu_mult *cm = hw_to_ccu_mult(hw); 66 67 return ccu_gate_helper_enable(&cm->common, cm->enable); 68 } 69 70 static int ccu_mult_is_enabled(struct clk_hw *hw) 71 { 72 struct ccu_mult *cm = hw_to_ccu_mult(hw); 73 74 return ccu_gate_helper_is_enabled(&cm->common, cm->enable); 75 } 76 77 static unsigned long ccu_mult_recalc_rate(struct clk_hw *hw, 78 unsigned long parent_rate) 79 { 80 struct ccu_mult *cm = hw_to_ccu_mult(hw); 81 unsigned long val; 82 u32 reg; 83 84 if (ccu_frac_helper_is_enabled(&cm->common, &cm->frac)) 85 return ccu_frac_helper_read_rate(&cm->common, &cm->frac); 86 87 reg = readl(cm->common.base + cm->common.reg); 88 val = reg >> cm->mult.shift; 89 val &= (1 << cm->mult.width) - 1; 90 91 parent_rate = ccu_mux_helper_apply_prediv(&cm->common, &cm->mux, -1, 92 parent_rate); 93 94 return parent_rate * (val + cm->mult.offset); 95 } 96 97 static int ccu_mult_determine_rate(struct clk_hw *hw, 98 struct clk_rate_request *req) 99 { 100 struct ccu_mult *cm = hw_to_ccu_mult(hw); 101 102 return ccu_mux_helper_determine_rate(&cm->common, &cm->mux, 103 req, ccu_mult_round_rate, cm); 104 } 105 106 static int ccu_mult_set_rate(struct clk_hw *hw, unsigned long rate, 107 unsigned long parent_rate) 108 { 109 struct ccu_mult *cm = hw_to_ccu_mult(hw); 110 struct _ccu_mult _cm; 111 unsigned long flags; 112 u32 reg; 113 114 if (ccu_frac_helper_has_rate(&cm->common, &cm->frac, rate)) 115 return ccu_frac_helper_set_rate(&cm->common, &cm->frac, rate); 116 else 117 ccu_frac_helper_disable(&cm->common, &cm->frac); 118 119 parent_rate = ccu_mux_helper_apply_prediv(&cm->common, &cm->mux, -1, 120 parent_rate); 121 122 _cm.min = cm->mult.min; 123 124 if (cm->mult.max) 125 _cm.max = cm->mult.max; 126 else 127 _cm.max = (1 << cm->mult.width) + cm->mult.offset - 1; 128 129 ccu_mult_find_best(parent_rate, rate, &_cm); 130 131 spin_lock_irqsave(cm->common.lock, flags); 132 133 reg = readl(cm->common.base + cm->common.reg); 134 reg &= ~GENMASK(cm->mult.width + cm->mult.shift - 1, cm->mult.shift); 135 reg |= ((_cm.mult - cm->mult.offset) << cm->mult.shift); 136 137 writel(reg, cm->common.base + cm->common.reg); 138 139 spin_unlock_irqrestore(cm->common.lock, flags); 140 141 ccu_helper_wait_for_lock(&cm->common, cm->lock); 142 143 return 0; 144 } 145 146 static u8 ccu_mult_get_parent(struct clk_hw *hw) 147 { 148 struct ccu_mult *cm = hw_to_ccu_mult(hw); 149 150 return ccu_mux_helper_get_parent(&cm->common, &cm->mux); 151 } 152 153 static int ccu_mult_set_parent(struct clk_hw *hw, u8 index) 154 { 155 struct ccu_mult *cm = hw_to_ccu_mult(hw); 156 157 return ccu_mux_helper_set_parent(&cm->common, &cm->mux, index); 158 } 159 160 const struct clk_ops ccu_mult_ops = { 161 .disable = ccu_mult_disable, 162 .enable = ccu_mult_enable, 163 .is_enabled = ccu_mult_is_enabled, 164 165 .get_parent = ccu_mult_get_parent, 166 .set_parent = ccu_mult_set_parent, 167 168 .determine_rate = ccu_mult_determine_rate, 169 .recalc_rate = ccu_mult_recalc_rate, 170 .set_rate = ccu_mult_set_rate, 171 }; 172