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_div.h"
12
ccu_div_round_rate(struct ccu_mux_internal * mux,struct clk_hw * parent,unsigned long * parent_rate,unsigned long rate,void * data)13 static unsigned long ccu_div_round_rate(struct ccu_mux_internal *mux,
14 struct clk_hw *parent,
15 unsigned long *parent_rate,
16 unsigned long rate,
17 void *data)
18 {
19 struct ccu_div *cd = data;
20
21 if (cd->common.features & CCU_FEATURE_FIXED_POSTDIV)
22 rate *= cd->fixed_post_div;
23
24 rate = divider_round_rate_parent(&cd->common.hw, parent,
25 rate, parent_rate,
26 cd->div.table, cd->div.width,
27 cd->div.flags);
28
29 if (cd->common.features & CCU_FEATURE_FIXED_POSTDIV)
30 rate /= cd->fixed_post_div;
31
32 return rate;
33 }
34
ccu_div_disable(struct clk_hw * hw)35 static void ccu_div_disable(struct clk_hw *hw)
36 {
37 struct ccu_div *cd = hw_to_ccu_div(hw);
38
39 return ccu_gate_helper_disable(&cd->common, cd->enable);
40 }
41
ccu_div_enable(struct clk_hw * hw)42 static int ccu_div_enable(struct clk_hw *hw)
43 {
44 struct ccu_div *cd = hw_to_ccu_div(hw);
45
46 return ccu_gate_helper_enable(&cd->common, cd->enable);
47 }
48
ccu_div_is_enabled(struct clk_hw * hw)49 static int ccu_div_is_enabled(struct clk_hw *hw)
50 {
51 struct ccu_div *cd = hw_to_ccu_div(hw);
52
53 return ccu_gate_helper_is_enabled(&cd->common, cd->enable);
54 }
55
ccu_div_recalc_rate(struct clk_hw * hw,unsigned long parent_rate)56 static unsigned long ccu_div_recalc_rate(struct clk_hw *hw,
57 unsigned long parent_rate)
58 {
59 struct ccu_div *cd = hw_to_ccu_div(hw);
60 unsigned long val;
61 u32 reg;
62
63 reg = readl(cd->common.base + cd->common.reg);
64 val = reg >> cd->div.shift;
65 val &= (1 << cd->div.width) - 1;
66
67 parent_rate = ccu_mux_helper_apply_prediv(&cd->common, &cd->mux, -1,
68 parent_rate);
69
70 val = divider_recalc_rate(hw, parent_rate, val, cd->div.table,
71 cd->div.flags, cd->div.width);
72
73 if (cd->common.features & CCU_FEATURE_FIXED_POSTDIV)
74 val /= cd->fixed_post_div;
75
76 return val;
77 }
78
ccu_div_determine_rate(struct clk_hw * hw,struct clk_rate_request * req)79 static int ccu_div_determine_rate(struct clk_hw *hw,
80 struct clk_rate_request *req)
81 {
82 struct ccu_div *cd = hw_to_ccu_div(hw);
83
84 return ccu_mux_helper_determine_rate(&cd->common, &cd->mux,
85 req, ccu_div_round_rate, cd);
86 }
87
ccu_div_set_rate(struct clk_hw * hw,unsigned long rate,unsigned long parent_rate)88 static int ccu_div_set_rate(struct clk_hw *hw, unsigned long rate,
89 unsigned long parent_rate)
90 {
91 struct ccu_div *cd = hw_to_ccu_div(hw);
92 unsigned long flags;
93 unsigned long val;
94 u32 reg;
95
96 parent_rate = ccu_mux_helper_apply_prediv(&cd->common, &cd->mux, -1,
97 parent_rate);
98
99 if (cd->common.features & CCU_FEATURE_FIXED_POSTDIV)
100 rate *= cd->fixed_post_div;
101
102 val = divider_get_val(rate, parent_rate, cd->div.table, cd->div.width,
103 cd->div.flags);
104
105 spin_lock_irqsave(cd->common.lock, flags);
106
107 reg = readl(cd->common.base + cd->common.reg);
108 reg &= ~GENMASK(cd->div.width + cd->div.shift - 1, cd->div.shift);
109
110 writel(reg | (val << cd->div.shift),
111 cd->common.base + cd->common.reg);
112
113 spin_unlock_irqrestore(cd->common.lock, flags);
114
115 return 0;
116 }
117
ccu_div_get_parent(struct clk_hw * hw)118 static u8 ccu_div_get_parent(struct clk_hw *hw)
119 {
120 struct ccu_div *cd = hw_to_ccu_div(hw);
121
122 return ccu_mux_helper_get_parent(&cd->common, &cd->mux);
123 }
124
ccu_div_set_parent(struct clk_hw * hw,u8 index)125 static int ccu_div_set_parent(struct clk_hw *hw, u8 index)
126 {
127 struct ccu_div *cd = hw_to_ccu_div(hw);
128
129 return ccu_mux_helper_set_parent(&cd->common, &cd->mux, index);
130 }
131
132 const struct clk_ops ccu_div_ops = {
133 .disable = ccu_div_disable,
134 .enable = ccu_div_enable,
135 .is_enabled = ccu_div_is_enabled,
136
137 .get_parent = ccu_div_get_parent,
138 .set_parent = ccu_div_set_parent,
139
140 .determine_rate = ccu_div_determine_rate,
141 .recalc_rate = ccu_div_recalc_rate,
142 .set_rate = ccu_div_set_rate,
143 };
144 EXPORT_SYMBOL_NS_GPL(ccu_div_ops, "SUNXI_CCU");
145