1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright 2012 Freescale Semiconductor, Inc.
* Copyright 2012 Linaro Ltd.
*/
#include <linux/bits.h>
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include <linux/err.h>
#include "clk.h"
static int clk_busy_wait(void __iomem *reg, u8 shift)
{
unsigned long timeout = jiffies + msecs_to_jiffies(10);
while (readl_relaxed(reg) & (1 << shift))
if (time_after(jiffies, timeout))
return -ETIMEDOUT;
return 0;
}
struct clk_busy_divider {
struct clk_divider div;
const struct clk_ops *div_ops;
void __iomem *reg;
u8 shift;
};
static inline struct clk_busy_divider *to_clk_busy_divider(struct clk_hw *hw)
{
struct clk_divider *div = to_clk_divider(hw);
return container_of(div, struct clk_busy_divider, div);
}
static unsigned long clk_busy_divider_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
struct clk_busy_divider *busy = to_clk_busy_divider(hw);
return busy->div_ops->recalc_rate(&busy->div.hw, parent_rate);
}
static long clk_busy_divider_round_rate(struct clk_hw *hw, unsigned long rate,
unsigned long *prate)
{
struct clk_busy_divider *busy = to_clk_busy_divider(hw);
return busy->div_ops->round_rate(&busy->div.hw, rate, prate);
}
static int clk_busy_divider_set_rate(struct clk_hw *hw, unsigned long rate,
unsigned long parent_rate)
{
struct clk_busy_divider *busy = to_clk_busy_divider(hw);
int ret;
ret = busy->div_ops->set_rate(&busy->div.hw, rate, parent_rate);
if (!ret)
ret = clk_busy_wait(busy->reg, busy->shift);
return ret;
}
static const struct clk_ops clk_busy_divider_ops = {
.recalc_rate = clk_busy_divider_recalc_rate,
.round_rate = clk_busy_divider_round_rate,
.set_rate = clk_busy_divider_set_rate,
};
struct clk_hw *imx_clk_hw_busy_divider(const char *name, const char *parent_name,
void __iomem *reg, u8 shift, u8 width,
void __iomem *busy_reg, u8 busy_shift)
{
struct clk_busy_divider *busy;
struct clk_hw *hw;
struct clk_init_data init;
int ret;
busy = kzalloc(sizeof(*busy), GFP_KERNEL);
if (!busy)
return ERR_PTR(-ENOMEM);
busy->reg = busy_reg;
busy->shift = busy_shift;
busy->div.reg = reg;
busy->div.shift = shift;
busy->div.width = width;
busy->div.lock = &imx_ccm_lock;
busy->div_ops = &clk_divider_ops;
init.name = name;
init.ops = &clk_busy_divider_ops;
init.flags = CLK_SET_RATE_PARENT | CLK_IS_CRITICAL;
init.parent_names = &parent_name;
init.num_parents = 1;
busy->div.hw.init = &init;
hw = &busy->div.hw;
ret = clk_hw_register(NULL, hw);
if (ret) {
kfree(busy);
return ERR_PTR(ret);
}
return hw;
}
struct clk_busy_mux {
struct clk_mux mux;
const struct clk_ops *mux_ops;
void __iomem *reg;
u8 shift;
};
static inline struct clk_busy_mux *to_clk_busy_mux(struct clk_hw *hw)
{
struct clk_mux *mux = to_clk_mux(hw);
return container_of(mux, struct clk_busy_mux, mux);
}
static u8 clk_busy_mux_get_parent(struct clk_hw *hw)
{
struct clk_busy_mux *busy = to_clk_busy_mux(hw);
return busy->mux_ops->get_parent(&busy->mux.hw);
}
static int clk_busy_mux_set_parent(struct clk_hw *hw, u8 index)
{
struct clk_busy_mux *busy = to_clk_busy_mux(hw);
int ret;
ret = busy->mux_ops->set_parent(&busy->mux.hw, index);
if (!ret)
ret = clk_busy_wait(busy->reg, busy->shift);
return ret;
}
static const struct clk_ops clk_busy_mux_ops = {
.determine_rate = clk_hw_determine_rate_no_reparent,
.get_parent = clk_busy_mux_get_parent,
.set_parent = clk_busy_mux_set_parent,
};
struct clk_hw *imx_clk_hw_busy_mux(const char *name, void __iomem *reg, u8 shift,
u8 width, void __iomem *busy_reg, u8 busy_shift,
const char * const *parent_names, int num_parents)
{
struct clk_busy_mux *busy;
struct clk_hw *hw;
struct clk_init_data init;
int ret;
busy = kzalloc(sizeof(*busy), GFP_KERNEL);
if (!busy)
return ERR_PTR(-ENOMEM);
busy->reg = busy_reg;
busy->shift = busy_shift;
busy->mux.reg = reg;
busy->mux.shift = shift;
busy->mux.mask = BIT(width) - 1;
busy->mux.lock = &imx_ccm_lock;
busy->mux_ops = &clk_mux_ops;
init.name = name;
init.ops = &clk_busy_mux_ops;
init.flags = CLK_IS_CRITICAL;
init.parent_names = parent_names;
init.num_parents = num_parents;
busy->mux.hw.init = &init;
hw = &busy->mux.hw;
ret = clk_hw_register(NULL, hw);
if (ret) {
kfree(busy);
return ERR_PTR(ret);
}
return hw;
}
|
