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