2 * Copyright (C) 2016 Maxime Ripard
3 * Maxime Ripard <maxime.ripard@free-electrons.com>
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.
11 #include <linux/clk-provider.h>
16 static void ccu_mp_find_best(unsigned long parent, unsigned long rate,
17 unsigned int max_m, unsigned int max_p,
18 unsigned int *m, unsigned int *p)
20 unsigned long best_rate = 0;
21 unsigned int best_m = 0, best_p = 0;
24 for (_p = 0; _p <= max_p; _p++) {
25 for (_m = 1; _m <= max_m; _m++) {
26 unsigned long tmp_rate = (parent >> _p) / _m;
31 if ((rate - tmp_rate) < (rate - best_rate)) {
43 static unsigned long ccu_mp_round_rate(struct ccu_mux_internal *mux,
44 unsigned long parent_rate,
48 struct ccu_mp *cmp = data;
51 ccu_mp_find_best(parent_rate, rate,
52 1 << cmp->m.width, (1 << cmp->p.width) - 1,
55 return (parent_rate >> p) / m;
58 static void ccu_mp_disable(struct clk_hw *hw)
60 struct ccu_mp *cmp = hw_to_ccu_mp(hw);
62 return ccu_gate_helper_disable(&cmp->common, cmp->enable);
65 static int ccu_mp_enable(struct clk_hw *hw)
67 struct ccu_mp *cmp = hw_to_ccu_mp(hw);
69 return ccu_gate_helper_enable(&cmp->common, cmp->enable);
72 static int ccu_mp_is_enabled(struct clk_hw *hw)
74 struct ccu_mp *cmp = hw_to_ccu_mp(hw);
76 return ccu_gate_helper_is_enabled(&cmp->common, cmp->enable);
79 static unsigned long ccu_mp_recalc_rate(struct clk_hw *hw,
80 unsigned long parent_rate)
82 struct ccu_mp *cmp = hw_to_ccu_mp(hw);
86 reg = readl(cmp->common.base + cmp->common.reg);
88 m = reg >> cmp->m.shift;
89 m &= (1 << cmp->m.width) - 1;
91 p = reg >> cmp->p.shift;
92 p &= (1 << cmp->p.width) - 1;
94 return (parent_rate >> p) / (m + 1);
97 static int ccu_mp_determine_rate(struct clk_hw *hw,
98 struct clk_rate_request *req)
100 struct ccu_mp *cmp = hw_to_ccu_mp(hw);
102 return ccu_mux_helper_determine_rate(&cmp->common, &cmp->mux,
103 req, ccu_mp_round_rate, cmp);
106 static int ccu_mp_set_rate(struct clk_hw *hw, unsigned long rate,
107 unsigned long parent_rate)
109 struct ccu_mp *cmp = hw_to_ccu_mp(hw);
114 ccu_mp_find_best(parent_rate, rate,
115 1 << cmp->m.width, (1 << cmp->p.width) - 1,
119 spin_lock_irqsave(cmp->common.lock, flags);
121 reg = readl(cmp->common.base + cmp->common.reg);
122 reg &= ~GENMASK(cmp->m.width + cmp->m.shift - 1, cmp->m.shift);
123 reg &= ~GENMASK(cmp->p.width + cmp->p.shift - 1, cmp->p.shift);
125 writel(reg | (p << cmp->p.shift) | ((m - 1) << cmp->m.shift),
126 cmp->common.base + cmp->common.reg);
128 spin_unlock_irqrestore(cmp->common.lock, flags);
133 static u8 ccu_mp_get_parent(struct clk_hw *hw)
135 struct ccu_mp *cmp = hw_to_ccu_mp(hw);
137 return ccu_mux_helper_get_parent(&cmp->common, &cmp->mux);
140 static int ccu_mp_set_parent(struct clk_hw *hw, u8 index)
142 struct ccu_mp *cmp = hw_to_ccu_mp(hw);
144 return ccu_mux_helper_set_parent(&cmp->common, &cmp->mux, index);
147 const struct clk_ops ccu_mp_ops = {
148 .disable = ccu_mp_disable,
149 .enable = ccu_mp_enable,
150 .is_enabled = ccu_mp_is_enabled,
152 .get_parent = ccu_mp_get_parent,
153 .set_parent = ccu_mp_set_parent,
155 .determine_rate = ccu_mp_determine_rate,
156 .recalc_rate = ccu_mp_recalc_rate,
157 .set_rate = ccu_mp_set_rate,