1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) 2016 Maxime Ripard
4 * Maxime Ripard <maxime.ripard@free-electrons.com>
5 */
6
7 #include <linux/clk-provider.h>
8 #include <linux/io.h>
9
10 #include "ccu_gate.h"
11 #include "ccu_mult.h"
12
13 struct _ccu_mult {
14 unsigned long mult, min, max;
15 };
16
ccu_mult_find_best(unsigned long parent,unsigned long rate,struct _ccu_mult * mult)17 static void ccu_mult_find_best(unsigned long parent, unsigned long rate,
18 struct _ccu_mult *mult)
19 {
20 int _mult;
21
22 _mult = rate / parent;
23 if (_mult < mult->min)
24 _mult = mult->min;
25
26 if (_mult > mult->max)
27 _mult = mult->max;
28
29 mult->mult = _mult;
30 }
31
ccu_mult_round_rate(struct ccu_mux_internal * mux,struct clk_hw * parent,unsigned long * parent_rate,unsigned long rate,void * data)32 static unsigned long ccu_mult_round_rate(struct ccu_mux_internal *mux,
33 struct clk_hw *parent,
34 unsigned long *parent_rate,
35 unsigned long rate,
36 void *data)
37 {
38 struct ccu_mult *cm = data;
39 struct _ccu_mult _cm;
40
41 _cm.min = cm->mult.min;
42
43 if (cm->mult.max)
44 _cm.max = cm->mult.max;
45 else
46 _cm.max = (1 << cm->mult.width) + cm->mult.offset - 1;
47
48 ccu_mult_find_best(*parent_rate, rate, &_cm);
49
50 return *parent_rate * _cm.mult;
51 }
52
ccu_mult_disable(struct clk_hw * hw)53 static void ccu_mult_disable(struct clk_hw *hw)
54 {
55 struct ccu_mult *cm = hw_to_ccu_mult(hw);
56
57 return ccu_gate_helper_disable(&cm->common, cm->enable);
58 }
59
ccu_mult_enable(struct clk_hw * hw)60 static int ccu_mult_enable(struct clk_hw *hw)
61 {
62 struct ccu_mult *cm = hw_to_ccu_mult(hw);
63
64 return ccu_gate_helper_enable(&cm->common, cm->enable);
65 }
66
ccu_mult_is_enabled(struct clk_hw * hw)67 static int ccu_mult_is_enabled(struct clk_hw *hw)
68 {
69 struct ccu_mult *cm = hw_to_ccu_mult(hw);
70
71 return ccu_gate_helper_is_enabled(&cm->common, cm->enable);
72 }
73
ccu_mult_recalc_rate(struct clk_hw * hw,unsigned long parent_rate)74 static unsigned long ccu_mult_recalc_rate(struct clk_hw *hw,
75 unsigned long parent_rate)
76 {
77 struct ccu_mult *cm = hw_to_ccu_mult(hw);
78 unsigned long val;
79 u32 reg;
80
81 if (ccu_frac_helper_is_enabled(&cm->common, &cm->frac))
82 return ccu_frac_helper_read_rate(&cm->common, &cm->frac);
83
84 reg = readl(cm->common.base + cm->common.reg);
85 val = reg >> cm->mult.shift;
86 val &= (1 << cm->mult.width) - 1;
87
88 parent_rate = ccu_mux_helper_apply_prediv(&cm->common, &cm->mux, -1,
89 parent_rate);
90
91 return parent_rate * (val + cm->mult.offset);
92 }
93
ccu_mult_determine_rate(struct clk_hw * hw,struct clk_rate_request * req)94 static int ccu_mult_determine_rate(struct clk_hw *hw,
95 struct clk_rate_request *req)
96 {
97 struct ccu_mult *cm = hw_to_ccu_mult(hw);
98
99 return ccu_mux_helper_determine_rate(&cm->common, &cm->mux,
100 req, ccu_mult_round_rate, cm);
101 }
102
ccu_mult_set_rate(struct clk_hw * hw,unsigned long rate,unsigned long parent_rate)103 static int ccu_mult_set_rate(struct clk_hw *hw, unsigned long rate,
104 unsigned long parent_rate)
105 {
106 struct ccu_mult *cm = hw_to_ccu_mult(hw);
107 struct _ccu_mult _cm;
108 unsigned long flags;
109 u32 reg;
110
111 if (ccu_frac_helper_has_rate(&cm->common, &cm->frac, rate)) {
112 ccu_frac_helper_enable(&cm->common, &cm->frac);
113
114 return ccu_frac_helper_set_rate(&cm->common, &cm->frac,
115 rate, cm->lock);
116 } else {
117 ccu_frac_helper_disable(&cm->common, &cm->frac);
118 }
119
120 parent_rate = ccu_mux_helper_apply_prediv(&cm->common, &cm->mux, -1,
121 parent_rate);
122
123 _cm.min = cm->mult.min;
124
125 if (cm->mult.max)
126 _cm.max = cm->mult.max;
127 else
128 _cm.max = (1 << cm->mult.width) + cm->mult.offset - 1;
129
130 ccu_mult_find_best(parent_rate, rate, &_cm);
131
132 spin_lock_irqsave(cm->common.lock, flags);
133
134 reg = readl(cm->common.base + cm->common.reg);
135 reg &= ~GENMASK(cm->mult.width + cm->mult.shift - 1, cm->mult.shift);
136 reg |= ((_cm.mult - cm->mult.offset) << cm->mult.shift);
137
138 writel(reg, cm->common.base + cm->common.reg);
139
140 spin_unlock_irqrestore(cm->common.lock, flags);
141
142 ccu_helper_wait_for_lock(&cm->common, cm->lock);
143
144 return 0;
145 }
146
ccu_mult_get_parent(struct clk_hw * hw)147 static u8 ccu_mult_get_parent(struct clk_hw *hw)
148 {
149 struct ccu_mult *cm = hw_to_ccu_mult(hw);
150
151 return ccu_mux_helper_get_parent(&cm->common, &cm->mux);
152 }
153
ccu_mult_set_parent(struct clk_hw * hw,u8 index)154 static int ccu_mult_set_parent(struct clk_hw *hw, u8 index)
155 {
156 struct ccu_mult *cm = hw_to_ccu_mult(hw);
157
158 return ccu_mux_helper_set_parent(&cm->common, &cm->mux, index);
159 }
160
161 const struct clk_ops ccu_mult_ops = {
162 .disable = ccu_mult_disable,
163 .enable = ccu_mult_enable,
164 .is_enabled = ccu_mult_is_enabled,
165
166 .get_parent = ccu_mult_get_parent,
167 .set_parent = ccu_mult_set_parent,
168
169 .determine_rate = ccu_mult_determine_rate,
170 .recalc_rate = ccu_mult_recalc_rate,
171 .set_rate = ccu_mult_set_rate,
172 };
173
