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 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
35static 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
42static 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
49static 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
56static 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
79static 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
88static 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
118static 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
125static 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
132const 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};
144EXPORT_SYMBOL_NS_GPL(ccu_div_ops, SUNXI_CCU);
145