6b13f685e
 김민수
BSP 최초 추가
|
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
|
/*
* Copyright (C) 2013 Boris BREZILLON <b.brezillon@overkiz.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
*/
#include <linux/clk-provider.h>
#include <linux/clkdev.h>
#include <linux/clk/at91_pmc.h>
#include <linux/delay.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/io.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/sched.h>
#include <linux/wait.h>
#include "pmc.h"
#define SLOW_CLOCK_FREQ 32768
#define MAINF_DIV 16
#define MAINFRDY_TIMEOUT (((MAINF_DIV + 1) * USEC_PER_SEC) / \
SLOW_CLOCK_FREQ)
#define MAINF_LOOP_MIN_WAIT (USEC_PER_SEC / SLOW_CLOCK_FREQ)
#define MAINF_LOOP_MAX_WAIT MAINFRDY_TIMEOUT
struct clk_main {
struct clk_hw hw;
struct at91_pmc *pmc;
unsigned long rate;
unsigned int irq;
wait_queue_head_t wait;
};
#define to_clk_main(hw) container_of(hw, struct clk_main, hw)
static irqreturn_t clk_main_irq_handler(int irq, void *dev_id)
{
struct clk_main *clkmain = (struct clk_main *)dev_id;
wake_up(&clkmain->wait);
disable_irq_nosync(clkmain->irq);
return IRQ_HANDLED;
}
static int clk_main_prepare(struct clk_hw *hw)
{
struct clk_main *clkmain = to_clk_main(hw);
struct at91_pmc *pmc = clkmain->pmc;
unsigned long halt_time, timeout;
u32 tmp;
while (!(pmc_read(pmc, AT91_PMC_SR) & AT91_PMC_MOSCS)) {
enable_irq(clkmain->irq);
wait_event(clkmain->wait,
pmc_read(pmc, AT91_PMC_SR) & AT91_PMC_MOSCS);
}
if (clkmain->rate)
return 0;
timeout = jiffies + usecs_to_jiffies(MAINFRDY_TIMEOUT);
do {
halt_time = jiffies;
tmp = pmc_read(pmc, AT91_CKGR_MCFR);
if (tmp & AT91_PMC_MAINRDY)
return 0;
usleep_range(MAINF_LOOP_MIN_WAIT, MAINF_LOOP_MAX_WAIT);
} while (time_before(halt_time, timeout));
return 0;
}
static int clk_main_is_prepared(struct clk_hw *hw)
{
struct clk_main *clkmain = to_clk_main(hw);
return !!(pmc_read(clkmain->pmc, AT91_PMC_SR) & AT91_PMC_MOSCS);
}
static unsigned long clk_main_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
u32 tmp;
struct clk_main *clkmain = to_clk_main(hw);
struct at91_pmc *pmc = clkmain->pmc;
if (clkmain->rate)
return clkmain->rate;
tmp = pmc_read(pmc, AT91_CKGR_MCFR) & AT91_PMC_MAINF;
clkmain->rate = (tmp * parent_rate) / MAINF_DIV;
return clkmain->rate;
}
static const struct clk_ops main_ops = {
.prepare = clk_main_prepare,
.is_prepared = clk_main_is_prepared,
.recalc_rate = clk_main_recalc_rate,
};
static struct clk * __init
at91_clk_register_main(struct at91_pmc *pmc,
unsigned int irq,
const char *name,
const char *parent_name,
unsigned long rate)
{
int ret;
struct clk_main *clkmain;
struct clk *clk = NULL;
struct clk_init_data init;
if (!pmc || !irq || !name)
return ERR_PTR(-EINVAL);
if (!rate && !parent_name)
return ERR_PTR(-EINVAL);
clkmain = kzalloc(sizeof(*clkmain), GFP_KERNEL);
if (!clkmain)
return ERR_PTR(-ENOMEM);
init.name = name;
init.ops = &main_ops;
init.parent_names = parent_name ? &parent_name : NULL;
init.num_parents = parent_name ? 1 : 0;
init.flags = parent_name ? 0 : CLK_IS_ROOT;
clkmain->hw.init = &init;
clkmain->rate = rate;
clkmain->pmc = pmc;
clkmain->irq = irq;
init_waitqueue_head(&clkmain->wait);
irq_set_status_flags(clkmain->irq, IRQ_NOAUTOEN);
ret = request_irq(clkmain->irq, clk_main_irq_handler,
IRQF_TRIGGER_HIGH, "clk-main", clkmain);
if (ret)
return ERR_PTR(ret);
clk = clk_register(NULL, &clkmain->hw);
if (IS_ERR(clk)) {
free_irq(clkmain->irq, clkmain);
kfree(clkmain);
}
return clk;
}
static void __init
of_at91_clk_main_setup(struct device_node *np, struct at91_pmc *pmc)
{
struct clk *clk;
unsigned int irq;
const char *parent_name;
const char *name = np->name;
u32 rate = 0;
parent_name = of_clk_get_parent_name(np, 0);
of_property_read_string(np, "clock-output-names", &name);
of_property_read_u32(np, "clock-frequency", &rate);
irq = irq_of_parse_and_map(np, 0);
if (!irq)
return;
clk = at91_clk_register_main(pmc, irq, name, parent_name, rate);
if (IS_ERR(clk))
return;
of_clk_add_provider(np, of_clk_src_simple_get, clk);
}
void __init of_at91rm9200_clk_main_setup(struct device_node *np,
struct at91_pmc *pmc)
{
of_at91_clk_main_setup(np, pmc);
}
|