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1/*
2 * drivers/rtc/rtc-vt8500.c
3 *
4 * Copyright (C) 2010 Alexey Charkov <alchark@gmail.com>
5 *
6 * Based on rtc-pxa.c
7 *
8 * This software is licensed under the terms of the GNU General Public
9 * License version 2, as published by the Free Software Foundation, and
10 * may be copied, distributed, and modified under those terms.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 */
17
18#include <linux/module.h>
19#include <linux/rtc.h>
20#include <linux/init.h>
21#include <linux/interrupt.h>
22#include <linux/io.h>
23#include <linux/bcd.h>
24#include <linux/platform_device.h>
25#include <linux/slab.h>
26
27/*
28 * Register definitions
29 */
30#define VT8500_RTC_TS 0x00 /* Time set */
31#define VT8500_RTC_DS 0x04 /* Date set */
32#define VT8500_RTC_AS 0x08 /* Alarm set */
33#define VT8500_RTC_CR 0x0c /* Control */
34#define VT8500_RTC_TR 0x10 /* Time read */
35#define VT8500_RTC_DR 0x14 /* Date read */
36#define VT8500_RTC_WS 0x18 /* Write status */
37#define VT8500_RTC_CL 0x20 /* Calibration */
38#define VT8500_RTC_IS 0x24 /* Interrupt status */
39#define VT8500_RTC_ST 0x28 /* Status */
40
41#define INVALID_TIME_BIT (1 << 31)
42
43#define DATE_CENTURY_S 19
44#define DATE_YEAR_S 11
45#define DATE_YEAR_MASK (0xff << DATE_YEAR_S)
46#define DATE_MONTH_S 6
47#define DATE_MONTH_MASK (0x1f << DATE_MONTH_S)
48#define DATE_DAY_MASK 0x3f
49
50#define TIME_DOW_S 20
51#define TIME_DOW_MASK (0x07 << TIME_DOW_S)
52#define TIME_HOUR_S 14
53#define TIME_HOUR_MASK (0x3f << TIME_HOUR_S)
54#define TIME_MIN_S 7
55#define TIME_MIN_MASK (0x7f << TIME_MIN_S)
56#define TIME_SEC_MASK 0x7f
57
58#define ALARM_DAY_S 20
59#define ALARM_DAY_MASK (0x3f << ALARM_DAY_S)
60
61#define ALARM_DAY_BIT (1 << 29)
62#define ALARM_HOUR_BIT (1 << 28)
63#define ALARM_MIN_BIT (1 << 27)
64#define ALARM_SEC_BIT (1 << 26)
65
66#define ALARM_ENABLE_MASK (ALARM_DAY_BIT \
67 | ALARM_HOUR_BIT \
68 | ALARM_MIN_BIT \
69 | ALARM_SEC_BIT)
70
71#define VT8500_RTC_CR_ENABLE (1 << 0) /* Enable RTC */
72#define VT8500_RTC_CR_24H (1 << 1) /* 24h time format */
73#define VT8500_RTC_CR_SM_ENABLE (1 << 2) /* Enable periodic irqs */
74#define VT8500_RTC_CR_SM_SEC (1 << 3) /* 0: 1Hz/60, 1: 1Hz */
75#define VT8500_RTC_CR_CALIB (1 << 4) /* Enable calibration */
76
77#define VT8500_RTC_IS_ALARM (1 << 0) /* Alarm interrupt status */
78
79struct vt8500_rtc {
80 void __iomem *regbase;
81 struct resource *res;
82 int irq_alarm;
83 struct rtc_device *rtc;
84 spinlock_t lock; /* Protects this structure */
85};
86
87static irqreturn_t vt8500_rtc_irq(int irq, void *dev_id)
88{
89 struct vt8500_rtc *vt8500_rtc = dev_id;
90 u32 isr;
91 unsigned long events = 0;
92
93 spin_lock(&vt8500_rtc->lock);
94
95 /* clear interrupt sources */
96 isr = readl(vt8500_rtc->regbase + VT8500_RTC_IS);
97 writel(isr, vt8500_rtc->regbase + VT8500_RTC_IS);
98
99 spin_unlock(&vt8500_rtc->lock);
100
101 if (isr & VT8500_RTC_IS_ALARM)
102 events |= RTC_AF | RTC_IRQF;
103
104 rtc_update_irq(vt8500_rtc->rtc, 1, events);
105
106 return IRQ_HANDLED;
107}
108
109static int vt8500_rtc_read_time(struct device *dev, struct rtc_time *tm)
110{
111 struct vt8500_rtc *vt8500_rtc = dev_get_drvdata(dev);
112 u32 date, time;
113
114 date = readl(vt8500_rtc->regbase + VT8500_RTC_DR);
115 time = readl(vt8500_rtc->regbase + VT8500_RTC_TR);
116
117 tm->tm_sec = bcd2bin(time & TIME_SEC_MASK);
118 tm->tm_min = bcd2bin((time & TIME_MIN_MASK) >> TIME_MIN_S);
119 tm->tm_hour = bcd2bin((time & TIME_HOUR_MASK) >> TIME_HOUR_S);
120 tm->tm_mday = bcd2bin(date & DATE_DAY_MASK);
121 tm->tm_mon = bcd2bin((date & DATE_MONTH_MASK) >> DATE_MONTH_S);
122 tm->tm_year = bcd2bin((date & DATE_YEAR_MASK) >> DATE_YEAR_S)
123 + ((date >> DATE_CENTURY_S) & 1 ? 200 : 100);
124 tm->tm_wday = (time & TIME_DOW_MASK) >> TIME_DOW_S;
125
126 return 0;
127}
128
129static int vt8500_rtc_set_time(struct device *dev, struct rtc_time *tm)
130{
131 struct vt8500_rtc *vt8500_rtc = dev_get_drvdata(dev);
132
133 if (tm->tm_year < 100) {
134 dev_warn(dev, "Only years 2000-2199 are supported by the "
135 "hardware!\n");
136 return -EINVAL;
137 }
138
139 writel((bin2bcd(tm->tm_year - 100) << DATE_YEAR_S)
140 | (bin2bcd(tm->tm_mon) << DATE_MONTH_S)
141 | (bin2bcd(tm->tm_mday)),
142 vt8500_rtc->regbase + VT8500_RTC_DS);
143 writel((bin2bcd(tm->tm_wday) << TIME_DOW_S)
144 | (bin2bcd(tm->tm_hour) << TIME_HOUR_S)
145 | (bin2bcd(tm->tm_min) << TIME_MIN_S)
146 | (bin2bcd(tm->tm_sec)),
147 vt8500_rtc->regbase + VT8500_RTC_TS);
148
149 return 0;
150}
151
152static int vt8500_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
153{
154 struct vt8500_rtc *vt8500_rtc = dev_get_drvdata(dev);
155 u32 isr, alarm;
156
157 alarm = readl(vt8500_rtc->regbase + VT8500_RTC_AS);
158 isr = readl(vt8500_rtc->regbase + VT8500_RTC_IS);
159
160 alrm->time.tm_mday = bcd2bin((alarm & ALARM_DAY_MASK) >> ALARM_DAY_S);
161 alrm->time.tm_hour = bcd2bin((alarm & TIME_HOUR_MASK) >> TIME_HOUR_S);
162 alrm->time.tm_min = bcd2bin((alarm & TIME_MIN_MASK) >> TIME_MIN_S);
163 alrm->time.tm_sec = bcd2bin((alarm & TIME_SEC_MASK));
164
165 alrm->enabled = (alarm & ALARM_ENABLE_MASK) ? 1 : 0;
166 alrm->pending = (isr & VT8500_RTC_IS_ALARM) ? 1 : 0;
167
168 return rtc_valid_tm(&alrm->time);
169}
170
171static int vt8500_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
172{
173 struct vt8500_rtc *vt8500_rtc = dev_get_drvdata(dev);
174
175 writel((alrm->enabled ? ALARM_ENABLE_MASK : 0)
176 | (bin2bcd(alrm->time.tm_mday) << ALARM_DAY_S)
177 | (bin2bcd(alrm->time.tm_hour) << TIME_HOUR_S)
178 | (bin2bcd(alrm->time.tm_min) << TIME_MIN_S)
179 | (bin2bcd(alrm->time.tm_sec)),
180 vt8500_rtc->regbase + VT8500_RTC_AS);
181
182 return 0;
183}
184
185static int vt8500_alarm_irq_enable(struct device *dev, unsigned int enabled)
186{
187 struct vt8500_rtc *vt8500_rtc = dev_get_drvdata(dev);
188 unsigned long tmp = readl(vt8500_rtc->regbase + VT8500_RTC_AS);
189
190 if (enabled)
191 tmp |= ALARM_ENABLE_MASK;
192 else
193 tmp &= ~ALARM_ENABLE_MASK;
194
195 writel(tmp, vt8500_rtc->regbase + VT8500_RTC_AS);
196 return 0;
197}
198
199static const struct rtc_class_ops vt8500_rtc_ops = {
200 .read_time = vt8500_rtc_read_time,
201 .set_time = vt8500_rtc_set_time,
202 .read_alarm = vt8500_rtc_read_alarm,
203 .set_alarm = vt8500_rtc_set_alarm,
204 .alarm_irq_enable = vt8500_alarm_irq_enable,
205};
206
207static int __devinit vt8500_rtc_probe(struct platform_device *pdev)
208{
209 struct vt8500_rtc *vt8500_rtc;
210 int ret;
211
212 vt8500_rtc = kzalloc(sizeof(struct vt8500_rtc), GFP_KERNEL);
213 if (!vt8500_rtc)
214 return -ENOMEM;
215
216 spin_lock_init(&vt8500_rtc->lock);
217 platform_set_drvdata(pdev, vt8500_rtc);
218
219 vt8500_rtc->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
220 if (!vt8500_rtc->res) {
221 dev_err(&pdev->dev, "No I/O memory resource defined\n");
222 ret = -ENXIO;
223 goto err_free;
224 }
225
226 vt8500_rtc->irq_alarm = platform_get_irq(pdev, 0);
227 if (vt8500_rtc->irq_alarm < 0) {
228 dev_err(&pdev->dev, "No alarm IRQ resource defined\n");
229 ret = -ENXIO;
230 goto err_free;
231 }
232
233 vt8500_rtc->res = request_mem_region(vt8500_rtc->res->start,
234 resource_size(vt8500_rtc->res),
235 "vt8500-rtc");
236 if (vt8500_rtc->res == NULL) {
237 dev_err(&pdev->dev, "failed to request I/O memory\n");
238 ret = -EBUSY;
239 goto err_free;
240 }
241
242 vt8500_rtc->regbase = ioremap(vt8500_rtc->res->start,
243 resource_size(vt8500_rtc->res));
244 if (!vt8500_rtc->regbase) {
245 dev_err(&pdev->dev, "Unable to map RTC I/O memory\n");
246 ret = -EBUSY;
247 goto err_release;
248 }
249
250 /* Enable RTC and set it to 24-hour mode */
251 writel(VT8500_RTC_CR_ENABLE | VT8500_RTC_CR_24H,
252 vt8500_rtc->regbase + VT8500_RTC_CR);
253
254 vt8500_rtc->rtc = rtc_device_register("vt8500-rtc", &pdev->dev,
255 &vt8500_rtc_ops, THIS_MODULE);
256 if (IS_ERR(vt8500_rtc->rtc)) {
257 ret = PTR_ERR(vt8500_rtc->rtc);
258 dev_err(&pdev->dev,
259 "Failed to register RTC device -> %d\n", ret);
260 goto err_unmap;
261 }
262
263 ret = request_irq(vt8500_rtc->irq_alarm, vt8500_rtc_irq, 0,
264 "rtc alarm", vt8500_rtc);
265 if (ret < 0) {
266 dev_err(&pdev->dev, "can't get irq %i, err %d\n",
267 vt8500_rtc->irq_alarm, ret);
268 goto err_unreg;
269 }
270
271 return 0;
272
273err_unreg:
274 rtc_device_unregister(vt8500_rtc->rtc);
275err_unmap:
276 iounmap(vt8500_rtc->regbase);
277err_release:
278 release_mem_region(vt8500_rtc->res->start,
279 resource_size(vt8500_rtc->res));
280err_free:
281 kfree(vt8500_rtc);
282 return ret;
283}
284
285static int __devexit vt8500_rtc_remove(struct platform_device *pdev)
286{
287 struct vt8500_rtc *vt8500_rtc = platform_get_drvdata(pdev);
288
289 free_irq(vt8500_rtc->irq_alarm, vt8500_rtc);
290
291 rtc_device_unregister(vt8500_rtc->rtc);
292
293 /* Disable alarm matching */
294 writel(0, vt8500_rtc->regbase + VT8500_RTC_IS);
295 iounmap(vt8500_rtc->regbase);
296 release_mem_region(vt8500_rtc->res->start,
297 resource_size(vt8500_rtc->res));
298
299 kfree(vt8500_rtc);
300 platform_set_drvdata(pdev, NULL);
301
302 return 0;
303}
304
305static struct platform_driver vt8500_rtc_driver = {
306 .probe = vt8500_rtc_probe,
307 .remove = __devexit_p(vt8500_rtc_remove),
308 .driver = {
309 .name = "vt8500-rtc",
310 .owner = THIS_MODULE,
311 },
312};
313
314static int __init vt8500_rtc_init(void)
315{
316 return platform_driver_register(&vt8500_rtc_driver);
317}
318module_init(vt8500_rtc_init);
319
320static void __exit vt8500_rtc_exit(void)
321{
322 platform_driver_unregister(&vt8500_rtc_driver);
323}
324module_exit(vt8500_rtc_exit);
325
326MODULE_AUTHOR("Alexey Charkov <alchark@gmail.com>");
327MODULE_DESCRIPTION("VIA VT8500 SoC Realtime Clock Driver (RTC)");
328MODULE_LICENSE("GPL");
329MODULE_ALIAS("platform:vt8500-rtc");
1/*
2 * drivers/rtc/rtc-vt8500.c
3 *
4 * Copyright (C) 2010 Alexey Charkov <alchark@gmail.com>
5 *
6 * Based on rtc-pxa.c
7 *
8 * This software is licensed under the terms of the GNU General Public
9 * License version 2, as published by the Free Software Foundation, and
10 * may be copied, distributed, and modified under those terms.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 */
17
18#include <linux/module.h>
19#include <linux/rtc.h>
20#include <linux/init.h>
21#include <linux/interrupt.h>
22#include <linux/io.h>
23#include <linux/bcd.h>
24#include <linux/platform_device.h>
25#include <linux/slab.h>
26#include <linux/of.h>
27
28/*
29 * Register definitions
30 */
31#define VT8500_RTC_TS 0x00 /* Time set */
32#define VT8500_RTC_DS 0x04 /* Date set */
33#define VT8500_RTC_AS 0x08 /* Alarm set */
34#define VT8500_RTC_CR 0x0c /* Control */
35#define VT8500_RTC_TR 0x10 /* Time read */
36#define VT8500_RTC_DR 0x14 /* Date read */
37#define VT8500_RTC_WS 0x18 /* Write status */
38#define VT8500_RTC_CL 0x20 /* Calibration */
39#define VT8500_RTC_IS 0x24 /* Interrupt status */
40#define VT8500_RTC_ST 0x28 /* Status */
41
42#define INVALID_TIME_BIT (1 << 31)
43
44#define DATE_CENTURY_S 19
45#define DATE_YEAR_S 11
46#define DATE_YEAR_MASK (0xff << DATE_YEAR_S)
47#define DATE_MONTH_S 6
48#define DATE_MONTH_MASK (0x1f << DATE_MONTH_S)
49#define DATE_DAY_MASK 0x3f
50
51#define TIME_DOW_S 20
52#define TIME_DOW_MASK (0x07 << TIME_DOW_S)
53#define TIME_HOUR_S 14
54#define TIME_HOUR_MASK (0x3f << TIME_HOUR_S)
55#define TIME_MIN_S 7
56#define TIME_MIN_MASK (0x7f << TIME_MIN_S)
57#define TIME_SEC_MASK 0x7f
58
59#define ALARM_DAY_S 20
60#define ALARM_DAY_MASK (0x3f << ALARM_DAY_S)
61
62#define ALARM_DAY_BIT (1 << 29)
63#define ALARM_HOUR_BIT (1 << 28)
64#define ALARM_MIN_BIT (1 << 27)
65#define ALARM_SEC_BIT (1 << 26)
66
67#define ALARM_ENABLE_MASK (ALARM_DAY_BIT \
68 | ALARM_HOUR_BIT \
69 | ALARM_MIN_BIT \
70 | ALARM_SEC_BIT)
71
72#define VT8500_RTC_CR_ENABLE (1 << 0) /* Enable RTC */
73#define VT8500_RTC_CR_12H (1 << 1) /* 12h time format */
74#define VT8500_RTC_CR_SM_ENABLE (1 << 2) /* Enable periodic irqs */
75#define VT8500_RTC_CR_SM_SEC (1 << 3) /* 0: 1Hz/60, 1: 1Hz */
76#define VT8500_RTC_CR_CALIB (1 << 4) /* Enable calibration */
77
78#define VT8500_RTC_IS_ALARM (1 << 0) /* Alarm interrupt status */
79
80struct vt8500_rtc {
81 void __iomem *regbase;
82 int irq_alarm;
83 struct rtc_device *rtc;
84 spinlock_t lock; /* Protects this structure */
85};
86
87static irqreturn_t vt8500_rtc_irq(int irq, void *dev_id)
88{
89 struct vt8500_rtc *vt8500_rtc = dev_id;
90 u32 isr;
91 unsigned long events = 0;
92
93 spin_lock(&vt8500_rtc->lock);
94
95 /* clear interrupt sources */
96 isr = readl(vt8500_rtc->regbase + VT8500_RTC_IS);
97 writel(isr, vt8500_rtc->regbase + VT8500_RTC_IS);
98
99 spin_unlock(&vt8500_rtc->lock);
100
101 if (isr & VT8500_RTC_IS_ALARM)
102 events |= RTC_AF | RTC_IRQF;
103
104 rtc_update_irq(vt8500_rtc->rtc, 1, events);
105
106 return IRQ_HANDLED;
107}
108
109static int vt8500_rtc_read_time(struct device *dev, struct rtc_time *tm)
110{
111 struct vt8500_rtc *vt8500_rtc = dev_get_drvdata(dev);
112 u32 date, time;
113
114 date = readl(vt8500_rtc->regbase + VT8500_RTC_DR);
115 time = readl(vt8500_rtc->regbase + VT8500_RTC_TR);
116
117 tm->tm_sec = bcd2bin(time & TIME_SEC_MASK);
118 tm->tm_min = bcd2bin((time & TIME_MIN_MASK) >> TIME_MIN_S);
119 tm->tm_hour = bcd2bin((time & TIME_HOUR_MASK) >> TIME_HOUR_S);
120 tm->tm_mday = bcd2bin(date & DATE_DAY_MASK);
121 tm->tm_mon = bcd2bin((date & DATE_MONTH_MASK) >> DATE_MONTH_S) - 1;
122 tm->tm_year = bcd2bin((date & DATE_YEAR_MASK) >> DATE_YEAR_S)
123 + ((date >> DATE_CENTURY_S) & 1 ? 200 : 100);
124 tm->tm_wday = (time & TIME_DOW_MASK) >> TIME_DOW_S;
125
126 return 0;
127}
128
129static int vt8500_rtc_set_time(struct device *dev, struct rtc_time *tm)
130{
131 struct vt8500_rtc *vt8500_rtc = dev_get_drvdata(dev);
132
133 if (tm->tm_year < 100) {
134 dev_warn(dev, "Only years 2000-2199 are supported by the "
135 "hardware!\n");
136 return -EINVAL;
137 }
138
139 writel((bin2bcd(tm->tm_year % 100) << DATE_YEAR_S)
140 | (bin2bcd(tm->tm_mon + 1) << DATE_MONTH_S)
141 | (bin2bcd(tm->tm_mday))
142 | ((tm->tm_year >= 200) << DATE_CENTURY_S),
143 vt8500_rtc->regbase + VT8500_RTC_DS);
144 writel((bin2bcd(tm->tm_wday) << TIME_DOW_S)
145 | (bin2bcd(tm->tm_hour) << TIME_HOUR_S)
146 | (bin2bcd(tm->tm_min) << TIME_MIN_S)
147 | (bin2bcd(tm->tm_sec)),
148 vt8500_rtc->regbase + VT8500_RTC_TS);
149
150 return 0;
151}
152
153static int vt8500_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
154{
155 struct vt8500_rtc *vt8500_rtc = dev_get_drvdata(dev);
156 u32 isr, alarm;
157
158 alarm = readl(vt8500_rtc->regbase + VT8500_RTC_AS);
159 isr = readl(vt8500_rtc->regbase + VT8500_RTC_IS);
160
161 alrm->time.tm_mday = bcd2bin((alarm & ALARM_DAY_MASK) >> ALARM_DAY_S);
162 alrm->time.tm_hour = bcd2bin((alarm & TIME_HOUR_MASK) >> TIME_HOUR_S);
163 alrm->time.tm_min = bcd2bin((alarm & TIME_MIN_MASK) >> TIME_MIN_S);
164 alrm->time.tm_sec = bcd2bin((alarm & TIME_SEC_MASK));
165
166 alrm->enabled = (alarm & ALARM_ENABLE_MASK) ? 1 : 0;
167 alrm->pending = (isr & VT8500_RTC_IS_ALARM) ? 1 : 0;
168
169 return rtc_valid_tm(&alrm->time);
170}
171
172static int vt8500_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
173{
174 struct vt8500_rtc *vt8500_rtc = dev_get_drvdata(dev);
175
176 writel((alrm->enabled ? ALARM_ENABLE_MASK : 0)
177 | (bin2bcd(alrm->time.tm_mday) << ALARM_DAY_S)
178 | (bin2bcd(alrm->time.tm_hour) << TIME_HOUR_S)
179 | (bin2bcd(alrm->time.tm_min) << TIME_MIN_S)
180 | (bin2bcd(alrm->time.tm_sec)),
181 vt8500_rtc->regbase + VT8500_RTC_AS);
182
183 return 0;
184}
185
186static int vt8500_alarm_irq_enable(struct device *dev, unsigned int enabled)
187{
188 struct vt8500_rtc *vt8500_rtc = dev_get_drvdata(dev);
189 unsigned long tmp = readl(vt8500_rtc->regbase + VT8500_RTC_AS);
190
191 if (enabled)
192 tmp |= ALARM_ENABLE_MASK;
193 else
194 tmp &= ~ALARM_ENABLE_MASK;
195
196 writel(tmp, vt8500_rtc->regbase + VT8500_RTC_AS);
197 return 0;
198}
199
200static const struct rtc_class_ops vt8500_rtc_ops = {
201 .read_time = vt8500_rtc_read_time,
202 .set_time = vt8500_rtc_set_time,
203 .read_alarm = vt8500_rtc_read_alarm,
204 .set_alarm = vt8500_rtc_set_alarm,
205 .alarm_irq_enable = vt8500_alarm_irq_enable,
206};
207
208static int vt8500_rtc_probe(struct platform_device *pdev)
209{
210 struct vt8500_rtc *vt8500_rtc;
211 struct resource *res;
212 int ret;
213
214 vt8500_rtc = devm_kzalloc(&pdev->dev,
215 sizeof(struct vt8500_rtc), GFP_KERNEL);
216 if (!vt8500_rtc)
217 return -ENOMEM;
218
219 spin_lock_init(&vt8500_rtc->lock);
220 platform_set_drvdata(pdev, vt8500_rtc);
221
222 vt8500_rtc->irq_alarm = platform_get_irq(pdev, 0);
223 if (vt8500_rtc->irq_alarm < 0) {
224 dev_err(&pdev->dev, "No alarm IRQ resource defined\n");
225 return vt8500_rtc->irq_alarm;
226 }
227
228 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
229 vt8500_rtc->regbase = devm_ioremap_resource(&pdev->dev, res);
230 if (IS_ERR(vt8500_rtc->regbase))
231 return PTR_ERR(vt8500_rtc->regbase);
232
233 /* Enable RTC and set it to 24-hour mode */
234 writel(VT8500_RTC_CR_ENABLE,
235 vt8500_rtc->regbase + VT8500_RTC_CR);
236
237 vt8500_rtc->rtc = devm_rtc_device_register(&pdev->dev, "vt8500-rtc",
238 &vt8500_rtc_ops, THIS_MODULE);
239 if (IS_ERR(vt8500_rtc->rtc)) {
240 ret = PTR_ERR(vt8500_rtc->rtc);
241 dev_err(&pdev->dev,
242 "Failed to register RTC device -> %d\n", ret);
243 goto err_return;
244 }
245
246 ret = devm_request_irq(&pdev->dev, vt8500_rtc->irq_alarm,
247 vt8500_rtc_irq, 0, "rtc alarm", vt8500_rtc);
248 if (ret < 0) {
249 dev_err(&pdev->dev, "can't get irq %i, err %d\n",
250 vt8500_rtc->irq_alarm, ret);
251 goto err_return;
252 }
253
254 return 0;
255
256err_return:
257 return ret;
258}
259
260static int vt8500_rtc_remove(struct platform_device *pdev)
261{
262 struct vt8500_rtc *vt8500_rtc = platform_get_drvdata(pdev);
263
264 /* Disable alarm matching */
265 writel(0, vt8500_rtc->regbase + VT8500_RTC_IS);
266
267 return 0;
268}
269
270static const struct of_device_id wmt_dt_ids[] = {
271 { .compatible = "via,vt8500-rtc", },
272 {}
273};
274MODULE_DEVICE_TABLE(of, wmt_dt_ids);
275
276static struct platform_driver vt8500_rtc_driver = {
277 .probe = vt8500_rtc_probe,
278 .remove = vt8500_rtc_remove,
279 .driver = {
280 .name = "vt8500-rtc",
281 .of_match_table = wmt_dt_ids,
282 },
283};
284
285module_platform_driver(vt8500_rtc_driver);
286
287MODULE_AUTHOR("Alexey Charkov <alchark@gmail.com>");
288MODULE_DESCRIPTION("VIA VT8500 SoC Realtime Clock Driver (RTC)");
289MODULE_LICENSE("GPL v2");
290MODULE_ALIAS("platform:vt8500-rtc");