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
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* rtc-cv1800.c: RTC driver for Sophgo cv1800 RTC
*
* Author: Jingbao Qiu <qiujingbao.dlmu@gmail.com>
*/
#include <linux/clk.h>
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/rtc.h>
#define SEC_PULSE_GEN 0x1004
#define ALARM_TIME 0x1008
#define ALARM_ENABLE 0x100C
#define SET_SEC_CNTR_VAL 0x1010
#define SET_SEC_CNTR_TRIG 0x1014
#define SEC_CNTR_VAL 0x1018
/*
* When in VDDBKUP domain, this MACRO register
* does not power down
*/
#define MACRO_RO_T 0x14A8
#define MACRO_RG_SET_T 0x1498
#define ALARM_ENABLE_MASK BIT(0)
#define SEL_SEC_PULSE BIT(31)
struct cv1800_rtc_priv {
struct rtc_device *rtc_dev;
struct regmap *rtc_map;
struct clk *clk;
int irq;
};
static bool cv1800_rtc_enabled(struct device *dev)
{
struct cv1800_rtc_priv *info = dev_get_drvdata(dev);
u32 reg;
regmap_read(info->rtc_map, SEC_PULSE_GEN, ®);
return (reg & SEL_SEC_PULSE) == 0;
}
static void cv1800_rtc_enable(struct device *dev)
{
struct cv1800_rtc_priv *info = dev_get_drvdata(dev);
/* Sec pulse generated internally */
regmap_update_bits(info->rtc_map, SEC_PULSE_GEN, SEL_SEC_PULSE, 0);
}
static int cv1800_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
{
struct cv1800_rtc_priv *info = dev_get_drvdata(dev);
regmap_write(info->rtc_map, ALARM_ENABLE, enabled);
return 0;
}
static int cv1800_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
struct cv1800_rtc_priv *info = dev_get_drvdata(dev);
unsigned long alarm_time;
alarm_time = rtc_tm_to_time64(&alrm->time);
cv1800_rtc_alarm_irq_enable(dev, 0);
regmap_write(info->rtc_map, ALARM_TIME, alarm_time);
cv1800_rtc_alarm_irq_enable(dev, alrm->enabled);
return 0;
}
static int cv1800_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
{
struct cv1800_rtc_priv *info = dev_get_drvdata(dev);
u32 enabled;
u32 time;
if (!cv1800_rtc_enabled(dev)) {
alarm->enabled = 0;
return 0;
}
regmap_read(info->rtc_map, ALARM_ENABLE, &enabled);
alarm->enabled = enabled & ALARM_ENABLE_MASK;
regmap_read(info->rtc_map, ALARM_TIME, &time);
rtc_time64_to_tm(time, &alarm->time);
return 0;
}
static int cv1800_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
struct cv1800_rtc_priv *info = dev_get_drvdata(dev);
u32 sec;
if (!cv1800_rtc_enabled(dev))
return -EINVAL;
regmap_read(info->rtc_map, SEC_CNTR_VAL, &sec);
rtc_time64_to_tm(sec, tm);
return 0;
}
static int cv1800_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
struct cv1800_rtc_priv *info = dev_get_drvdata(dev);
unsigned long sec;
sec = rtc_tm_to_time64(tm);
regmap_write(info->rtc_map, SET_SEC_CNTR_VAL, sec);
regmap_write(info->rtc_map, SET_SEC_CNTR_TRIG, 1);
regmap_write(info->rtc_map, MACRO_RG_SET_T, sec);
cv1800_rtc_enable(dev);
return 0;
}
static irqreturn_t cv1800_rtc_irq_handler(int irq, void *dev_id)
{
struct cv1800_rtc_priv *info = dev_id;
rtc_update_irq(info->rtc_dev, 1, RTC_IRQF | RTC_AF);
regmap_write(info->rtc_map, ALARM_ENABLE, 0);
return IRQ_HANDLED;
}
static const struct rtc_class_ops cv1800_rtc_ops = {
.read_time = cv1800_rtc_read_time,
.set_time = cv1800_rtc_set_time,
.read_alarm = cv1800_rtc_read_alarm,
.set_alarm = cv1800_rtc_set_alarm,
.alarm_irq_enable = cv1800_rtc_alarm_irq_enable,
};
static int cv1800_rtc_probe(struct platform_device *pdev)
{
struct cv1800_rtc_priv *rtc;
int ret;
rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
if (!rtc)
return -ENOMEM;
rtc->rtc_map = device_node_to_regmap(pdev->dev.parent->of_node);
if (IS_ERR(rtc->rtc_map))
return dev_err_probe(&pdev->dev, PTR_ERR(rtc->rtc_map),
"cannot get parent regmap\n");
rtc->irq = platform_get_irq(pdev, 0);
if (rtc->irq < 0)
return rtc->irq;
rtc->clk = devm_clk_get_enabled(pdev->dev.parent, "rtc");
if (IS_ERR(rtc->clk))
return dev_err_probe(&pdev->dev, PTR_ERR(rtc->clk),
"rtc clk not found\n");
platform_set_drvdata(pdev, rtc);
device_init_wakeup(&pdev->dev, 1);
rtc->rtc_dev = devm_rtc_allocate_device(&pdev->dev);
if (IS_ERR(rtc->rtc_dev))
return PTR_ERR(rtc->rtc_dev);
rtc->rtc_dev->ops = &cv1800_rtc_ops;
rtc->rtc_dev->range_max = U32_MAX;
ret = devm_request_irq(&pdev->dev, rtc->irq, cv1800_rtc_irq_handler,
IRQF_TRIGGER_HIGH, "rtc alarm", rtc);
if (ret)
return dev_err_probe(&pdev->dev, ret,
"cannot register interrupt handler\n");
return devm_rtc_register_device(rtc->rtc_dev);
}
static const struct platform_device_id cv1800_rtc_id[] = {
{ .name = "cv1800b-rtc" },
{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(platform, cv1800_rtc_id);
static struct platform_driver cv1800_rtc_driver = {
.driver = {
.name = "sophgo-cv1800-rtc",
},
.probe = cv1800_rtc_probe,
.id_table = cv1800_rtc_id,
};
module_platform_driver(cv1800_rtc_driver);
MODULE_AUTHOR("Jingbao Qiu");
MODULE_DESCRIPTION("Sophgo cv1800 RTC Driver");
MODULE_LICENSE("GPL");
|
