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
|
/*
* Copyright (c) 2006-2022, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2022-3-08 GuEe-GUI the first version
*/
#include "clk-rk.h"
int rockchip_gcd(int m, int n)
{
while (m > 0)
{
if (n > m)
{
int t = m;
m = n;
n = t;
}
m -= n;
}
return n;
}
/*
* rational_best_approximation(31415, 10000,
* (1 << 8) - 1, (1 << 5) - 1, &n, &d);
*
* you may look at given_numerator as a fixed point number,
* with the fractional part size described in given_denominator.
*
* for theoretical background, see:
* http://en.wikipedia.org/wiki/Continued_fraction
*/
void rational_best_approximation(rt_ubase_t given_numerator,
rt_ubase_t given_denominator,
rt_ubase_t max_numerator,
rt_ubase_t max_denominator,
rt_ubase_t *best_numerator,
rt_ubase_t *best_denominator)
{
rt_ubase_t n, d, n0, d0, n1, d1;
n = given_numerator;
d = given_denominator;
n0 = 0;
d1 = 0;
n1 = 1;
d0 = 1;
for (;;)
{
rt_ubase_t t, a;
if (n1 > max_numerator || d1 > max_denominator)
{
n1 = n0;
d1 = d0;
break;
}
if (d == 0)
{
break;
}
t = d;
a = n / d;
d = n % d;
n = t;
t = n0 + a * n1;
n0 = n1;
n1 = t;
t = d0 + a * d1;
d0 = d1;
d1 = t;
}
*best_numerator = n1;
*best_denominator = d1;
}
void rockchip_clk_init(struct rockchip_clk_provider *provider,
struct rt_clk_cell **cells, rt_size_t cells_nr)
{
for (rt_size_t i = 0; i < cells_nr; ++i)
{
struct rt_clk_cell *cell = cells[i];
struct rockchip_clk_cell *rk_cell;
if (!cell)
{
continue;
}
rk_cell = cell_to_rockchip_clk_cell(cell);
rk_cell->provider = provider;
if (rk_cell->init)
{
rk_cell->init(rk_cell);
}
}
}
void rockchip_clk_setup(struct rockchip_clk_provider *provider,
struct rt_clk_cell **cells, rt_size_t cells_nr)
{
for (rt_size_t i = 0; i < cells_nr; ++i)
{
struct rt_clk_cell *cell = cells[i];
struct rockchip_clk_cell *rk_cell;
if (!cell)
{
continue;
}
rk_cell = cell_to_rockchip_clk_cell(cell);
if (rk_cell->setup)
{
rk_cell->setup(rk_cell);
}
}
}
struct rockchip_restart
{
struct rt_device parent;
rt_uint32_t reg;
struct rockchip_clk_provider *provider;
void (*callback)(struct rockchip_clk_provider *provider);
};
static rt_err_t rockchip_restart_handler(struct rt_device *dev)
{
struct rockchip_restart *rdev = rt_container_of(dev, struct rockchip_restart, parent);
if (rdev->callback)
{
rdev->callback(rdev->provider);
}
HWREG32(rdev->provider->reg_base + rdev->reg) = 0xfdb9;
return RT_EOK;
}
void rockchip_register_restart_notifier(struct rockchip_clk_provider *provider,
rt_uint32_t reg, void (*callback)(struct rockchip_clk_provider *provider))
{
struct rockchip_restart *rdev = rt_calloc(1, sizeof(*rdev));
if (!rdev)
{
return;
}
rdev->reg = reg;
rdev->provider = provider;
rdev->callback = callback;
rt_dm_dev_set_name(&rdev->parent, "RK-CLK");
rt_dm_power_off_handler(&rdev->parent, RT_DM_POWER_OFF_MODE_RESET,
RT_DM_POWER_OFF_PRIO_PLATFORM, rockchip_restart_handler);
}
|
