Commit | Line | Data |
---|---|---|
9c92ab61 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
f77fbdf9 AC |
2 | /* |
3 | * drivers/rtc/rtc-vt8500.c | |
4 | * | |
5 | * Copyright (C) 2010 Alexey Charkov <alchark@gmail.com> | |
6 | * | |
7 | * Based on rtc-pxa.c | |
f77fbdf9 AC |
8 | */ |
9 | ||
10 | #include <linux/module.h> | |
11 | #include <linux/rtc.h> | |
12 | #include <linux/init.h> | |
13 | #include <linux/interrupt.h> | |
14 | #include <linux/io.h> | |
15 | #include <linux/bcd.h> | |
16 | #include <linux/platform_device.h> | |
17 | #include <linux/slab.h> | |
7f4b48b3 | 18 | #include <linux/of.h> |
f77fbdf9 AC |
19 | |
20 | /* | |
21 | * Register definitions | |
22 | */ | |
23 | #define VT8500_RTC_TS 0x00 /* Time set */ | |
24 | #define VT8500_RTC_DS 0x04 /* Date set */ | |
25 | #define VT8500_RTC_AS 0x08 /* Alarm set */ | |
26 | #define VT8500_RTC_CR 0x0c /* Control */ | |
27 | #define VT8500_RTC_TR 0x10 /* Time read */ | |
28 | #define VT8500_RTC_DR 0x14 /* Date read */ | |
29 | #define VT8500_RTC_WS 0x18 /* Write status */ | |
30 | #define VT8500_RTC_CL 0x20 /* Calibration */ | |
31 | #define VT8500_RTC_IS 0x24 /* Interrupt status */ | |
32 | #define VT8500_RTC_ST 0x28 /* Status */ | |
33 | ||
34 | #define INVALID_TIME_BIT (1 << 31) | |
35 | ||
36 | #define DATE_CENTURY_S 19 | |
37 | #define DATE_YEAR_S 11 | |
38 | #define DATE_YEAR_MASK (0xff << DATE_YEAR_S) | |
39 | #define DATE_MONTH_S 6 | |
40 | #define DATE_MONTH_MASK (0x1f << DATE_MONTH_S) | |
41 | #define DATE_DAY_MASK 0x3f | |
42 | ||
43 | #define TIME_DOW_S 20 | |
44 | #define TIME_DOW_MASK (0x07 << TIME_DOW_S) | |
45 | #define TIME_HOUR_S 14 | |
46 | #define TIME_HOUR_MASK (0x3f << TIME_HOUR_S) | |
47 | #define TIME_MIN_S 7 | |
48 | #define TIME_MIN_MASK (0x7f << TIME_MIN_S) | |
49 | #define TIME_SEC_MASK 0x7f | |
50 | ||
51 | #define ALARM_DAY_S 20 | |
52 | #define ALARM_DAY_MASK (0x3f << ALARM_DAY_S) | |
53 | ||
54 | #define ALARM_DAY_BIT (1 << 29) | |
55 | #define ALARM_HOUR_BIT (1 << 28) | |
56 | #define ALARM_MIN_BIT (1 << 27) | |
57 | #define ALARM_SEC_BIT (1 << 26) | |
58 | ||
59 | #define ALARM_ENABLE_MASK (ALARM_DAY_BIT \ | |
60 | | ALARM_HOUR_BIT \ | |
61 | | ALARM_MIN_BIT \ | |
62 | | ALARM_SEC_BIT) | |
63 | ||
64 | #define VT8500_RTC_CR_ENABLE (1 << 0) /* Enable RTC */ | |
532db570 | 65 | #define VT8500_RTC_CR_12H (1 << 1) /* 12h time format */ |
f77fbdf9 AC |
66 | #define VT8500_RTC_CR_SM_ENABLE (1 << 2) /* Enable periodic irqs */ |
67 | #define VT8500_RTC_CR_SM_SEC (1 << 3) /* 0: 1Hz/60, 1: 1Hz */ | |
68 | #define VT8500_RTC_CR_CALIB (1 << 4) /* Enable calibration */ | |
69 | ||
07187ee1 WS |
70 | #define VT8500_RTC_IS_ALARM (1 << 0) /* Alarm interrupt status */ |
71 | ||
f77fbdf9 AC |
72 | struct vt8500_rtc { |
73 | void __iomem *regbase; | |
f77fbdf9 | 74 | int irq_alarm; |
f77fbdf9 AC |
75 | struct rtc_device *rtc; |
76 | spinlock_t lock; /* Protects this structure */ | |
77 | }; | |
78 | ||
79 | static irqreturn_t vt8500_rtc_irq(int irq, void *dev_id) | |
80 | { | |
81 | struct vt8500_rtc *vt8500_rtc = dev_id; | |
82 | u32 isr; | |
83 | unsigned long events = 0; | |
84 | ||
85 | spin_lock(&vt8500_rtc->lock); | |
86 | ||
87 | /* clear interrupt sources */ | |
88 | isr = readl(vt8500_rtc->regbase + VT8500_RTC_IS); | |
89 | writel(isr, vt8500_rtc->regbase + VT8500_RTC_IS); | |
90 | ||
91 | spin_unlock(&vt8500_rtc->lock); | |
92 | ||
07187ee1 | 93 | if (isr & VT8500_RTC_IS_ALARM) |
f77fbdf9 AC |
94 | events |= RTC_AF | RTC_IRQF; |
95 | ||
f77fbdf9 AC |
96 | rtc_update_irq(vt8500_rtc->rtc, 1, events); |
97 | ||
98 | return IRQ_HANDLED; | |
99 | } | |
100 | ||
101 | static int vt8500_rtc_read_time(struct device *dev, struct rtc_time *tm) | |
102 | { | |
103 | struct vt8500_rtc *vt8500_rtc = dev_get_drvdata(dev); | |
104 | u32 date, time; | |
105 | ||
106 | date = readl(vt8500_rtc->regbase + VT8500_RTC_DR); | |
107 | time = readl(vt8500_rtc->regbase + VT8500_RTC_TR); | |
108 | ||
109 | tm->tm_sec = bcd2bin(time & TIME_SEC_MASK); | |
110 | tm->tm_min = bcd2bin((time & TIME_MIN_MASK) >> TIME_MIN_S); | |
111 | tm->tm_hour = bcd2bin((time & TIME_HOUR_MASK) >> TIME_HOUR_S); | |
112 | tm->tm_mday = bcd2bin(date & DATE_DAY_MASK); | |
2f90b683 | 113 | tm->tm_mon = bcd2bin((date & DATE_MONTH_MASK) >> DATE_MONTH_S) - 1; |
f77fbdf9 AC |
114 | tm->tm_year = bcd2bin((date & DATE_YEAR_MASK) >> DATE_YEAR_S) |
115 | + ((date >> DATE_CENTURY_S) & 1 ? 200 : 100); | |
116 | tm->tm_wday = (time & TIME_DOW_MASK) >> TIME_DOW_S; | |
117 | ||
118 | return 0; | |
119 | } | |
120 | ||
121 | static int vt8500_rtc_set_time(struct device *dev, struct rtc_time *tm) | |
122 | { | |
123 | struct vt8500_rtc *vt8500_rtc = dev_get_drvdata(dev); | |
124 | ||
3bdf8cd3 | 125 | writel((bin2bcd(tm->tm_year % 100) << DATE_YEAR_S) |
2f90b683 TP |
126 | | (bin2bcd(tm->tm_mon + 1) << DATE_MONTH_S) |
127 | | (bin2bcd(tm->tm_mday)) | |
128 | | ((tm->tm_year >= 200) << DATE_CENTURY_S), | |
f77fbdf9 AC |
129 | vt8500_rtc->regbase + VT8500_RTC_DS); |
130 | writel((bin2bcd(tm->tm_wday) << TIME_DOW_S) | |
131 | | (bin2bcd(tm->tm_hour) << TIME_HOUR_S) | |
132 | | (bin2bcd(tm->tm_min) << TIME_MIN_S) | |
133 | | (bin2bcd(tm->tm_sec)), | |
134 | vt8500_rtc->regbase + VT8500_RTC_TS); | |
135 | ||
136 | return 0; | |
137 | } | |
138 | ||
139 | static int vt8500_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
140 | { | |
141 | struct vt8500_rtc *vt8500_rtc = dev_get_drvdata(dev); | |
142 | u32 isr, alarm; | |
143 | ||
144 | alarm = readl(vt8500_rtc->regbase + VT8500_RTC_AS); | |
145 | isr = readl(vt8500_rtc->regbase + VT8500_RTC_IS); | |
146 | ||
147 | alrm->time.tm_mday = bcd2bin((alarm & ALARM_DAY_MASK) >> ALARM_DAY_S); | |
148 | alrm->time.tm_hour = bcd2bin((alarm & TIME_HOUR_MASK) >> TIME_HOUR_S); | |
149 | alrm->time.tm_min = bcd2bin((alarm & TIME_MIN_MASK) >> TIME_MIN_S); | |
150 | alrm->time.tm_sec = bcd2bin((alarm & TIME_SEC_MASK)); | |
151 | ||
152 | alrm->enabled = (alarm & ALARM_ENABLE_MASK) ? 1 : 0; | |
07187ee1 | 153 | alrm->pending = (isr & VT8500_RTC_IS_ALARM) ? 1 : 0; |
f77fbdf9 | 154 | |
f77fbdf9 AC |
155 | return rtc_valid_tm(&alrm->time); |
156 | } | |
157 | ||
158 | static int vt8500_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
159 | { | |
160 | struct vt8500_rtc *vt8500_rtc = dev_get_drvdata(dev); | |
161 | ||
162 | writel((alrm->enabled ? ALARM_ENABLE_MASK : 0) | |
163 | | (bin2bcd(alrm->time.tm_mday) << ALARM_DAY_S) | |
164 | | (bin2bcd(alrm->time.tm_hour) << TIME_HOUR_S) | |
165 | | (bin2bcd(alrm->time.tm_min) << TIME_MIN_S) | |
166 | | (bin2bcd(alrm->time.tm_sec)), | |
167 | vt8500_rtc->regbase + VT8500_RTC_AS); | |
168 | ||
169 | return 0; | |
170 | } | |
171 | ||
172 | static int vt8500_alarm_irq_enable(struct device *dev, unsigned int enabled) | |
173 | { | |
174 | struct vt8500_rtc *vt8500_rtc = dev_get_drvdata(dev); | |
175 | unsigned long tmp = readl(vt8500_rtc->regbase + VT8500_RTC_AS); | |
176 | ||
177 | if (enabled) | |
178 | tmp |= ALARM_ENABLE_MASK; | |
179 | else | |
180 | tmp &= ~ALARM_ENABLE_MASK; | |
181 | ||
182 | writel(tmp, vt8500_rtc->regbase + VT8500_RTC_AS); | |
183 | return 0; | |
184 | } | |
185 | ||
f77fbdf9 AC |
186 | static const struct rtc_class_ops vt8500_rtc_ops = { |
187 | .read_time = vt8500_rtc_read_time, | |
188 | .set_time = vt8500_rtc_set_time, | |
189 | .read_alarm = vt8500_rtc_read_alarm, | |
190 | .set_alarm = vt8500_rtc_set_alarm, | |
191 | .alarm_irq_enable = vt8500_alarm_irq_enable, | |
f77fbdf9 AC |
192 | }; |
193 | ||
5a167f45 | 194 | static int vt8500_rtc_probe(struct platform_device *pdev) |
f77fbdf9 AC |
195 | { |
196 | struct vt8500_rtc *vt8500_rtc; | |
197 | int ret; | |
198 | ||
0d7ecb83 DN |
199 | vt8500_rtc = devm_kzalloc(&pdev->dev, |
200 | sizeof(struct vt8500_rtc), GFP_KERNEL); | |
f77fbdf9 AC |
201 | if (!vt8500_rtc) |
202 | return -ENOMEM; | |
203 | ||
204 | spin_lock_init(&vt8500_rtc->lock); | |
205 | platform_set_drvdata(pdev, vt8500_rtc); | |
206 | ||
f77fbdf9 | 207 | vt8500_rtc->irq_alarm = platform_get_irq(pdev, 0); |
faac9102 | 208 | if (vt8500_rtc->irq_alarm < 0) |
58f27d7d | 209 | return vt8500_rtc->irq_alarm; |
f77fbdf9 | 210 | |
09ef18bc | 211 | vt8500_rtc->regbase = devm_platform_ioremap_resource(pdev, 0); |
caa3af25 JH |
212 | if (IS_ERR(vt8500_rtc->regbase)) |
213 | return PTR_ERR(vt8500_rtc->regbase); | |
f77fbdf9 | 214 | |
03ad2d50 | 215 | /* Enable RTC and set it to 24-hour mode */ |
532db570 | 216 | writel(VT8500_RTC_CR_ENABLE, |
f77fbdf9 AC |
217 | vt8500_rtc->regbase + VT8500_RTC_CR); |
218 | ||
d8bced4b | 219 | vt8500_rtc->rtc = devm_rtc_allocate_device(&pdev->dev); |
3e7d6397 | 220 | if (IS_ERR(vt8500_rtc->rtc)) |
e979d049 | 221 | return PTR_ERR(vt8500_rtc->rtc); |
f77fbdf9 | 222 | |
d8bced4b | 223 | vt8500_rtc->rtc->ops = &vt8500_rtc_ops; |
1a064850 AB |
224 | vt8500_rtc->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000; |
225 | vt8500_rtc->rtc->range_max = RTC_TIMESTAMP_END_2199; | |
d8bced4b | 226 | |
0db29c1d JH |
227 | ret = devm_request_irq(&pdev->dev, vt8500_rtc->irq_alarm, |
228 | vt8500_rtc_irq, 0, "rtc alarm", vt8500_rtc); | |
f77fbdf9 AC |
229 | if (ret < 0) { |
230 | dev_err(&pdev->dev, "can't get irq %i, err %d\n", | |
231 | vt8500_rtc->irq_alarm, ret); | |
e979d049 | 232 | return ret; |
f77fbdf9 AC |
233 | } |
234 | ||
fdcfd854 | 235 | return devm_rtc_register_device(vt8500_rtc->rtc); |
f77fbdf9 AC |
236 | } |
237 | ||
5a167f45 | 238 | static int vt8500_rtc_remove(struct platform_device *pdev) |
f77fbdf9 AC |
239 | { |
240 | struct vt8500_rtc *vt8500_rtc = platform_get_drvdata(pdev); | |
241 | ||
f77fbdf9 AC |
242 | /* Disable alarm matching */ |
243 | writel(0, vt8500_rtc->regbase + VT8500_RTC_IS); | |
f77fbdf9 | 244 | |
f77fbdf9 AC |
245 | return 0; |
246 | } | |
247 | ||
7f4b48b3 TP |
248 | static const struct of_device_id wmt_dt_ids[] = { |
249 | { .compatible = "via,vt8500-rtc", }, | |
250 | {} | |
251 | }; | |
73798d5c | 252 | MODULE_DEVICE_TABLE(of, wmt_dt_ids); |
7f4b48b3 | 253 | |
f77fbdf9 AC |
254 | static struct platform_driver vt8500_rtc_driver = { |
255 | .probe = vt8500_rtc_probe, | |
5a167f45 | 256 | .remove = vt8500_rtc_remove, |
f77fbdf9 AC |
257 | .driver = { |
258 | .name = "vt8500-rtc", | |
ce6bafdf | 259 | .of_match_table = wmt_dt_ids, |
f77fbdf9 AC |
260 | }, |
261 | }; | |
262 | ||
0c4eae66 | 263 | module_platform_driver(vt8500_rtc_driver); |
f77fbdf9 AC |
264 | |
265 | MODULE_AUTHOR("Alexey Charkov <alchark@gmail.com>"); | |
266 | MODULE_DESCRIPTION("VIA VT8500 SoC Realtime Clock Driver (RTC)"); | |
7f4b48b3 | 267 | MODULE_LICENSE("GPL v2"); |
f77fbdf9 | 268 | MODULE_ALIAS("platform:vt8500-rtc"); |