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f77fbdf9 AC |
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> | |
7f4b48b3 | 26 | #include <linux/of.h> |
f77fbdf9 AC |
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_24H (1 << 1) /* 24h 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 | ||
07187ee1 WS |
78 | #define VT8500_RTC_IS_ALARM (1 << 0) /* Alarm interrupt status */ |
79 | ||
f77fbdf9 AC |
80 | struct vt8500_rtc { |
81 | void __iomem *regbase; | |
82 | struct resource *res; | |
83 | int irq_alarm; | |
f77fbdf9 AC |
84 | struct rtc_device *rtc; |
85 | spinlock_t lock; /* Protects this structure */ | |
86 | }; | |
87 | ||
88 | static irqreturn_t vt8500_rtc_irq(int irq, void *dev_id) | |
89 | { | |
90 | struct vt8500_rtc *vt8500_rtc = dev_id; | |
91 | u32 isr; | |
92 | unsigned long events = 0; | |
93 | ||
94 | spin_lock(&vt8500_rtc->lock); | |
95 | ||
96 | /* clear interrupt sources */ | |
97 | isr = readl(vt8500_rtc->regbase + VT8500_RTC_IS); | |
98 | writel(isr, vt8500_rtc->regbase + VT8500_RTC_IS); | |
99 | ||
100 | spin_unlock(&vt8500_rtc->lock); | |
101 | ||
07187ee1 | 102 | if (isr & VT8500_RTC_IS_ALARM) |
f77fbdf9 AC |
103 | events |= RTC_AF | RTC_IRQF; |
104 | ||
f77fbdf9 AC |
105 | rtc_update_irq(vt8500_rtc->rtc, 1, events); |
106 | ||
107 | return IRQ_HANDLED; | |
108 | } | |
109 | ||
110 | static int vt8500_rtc_read_time(struct device *dev, struct rtc_time *tm) | |
111 | { | |
112 | struct vt8500_rtc *vt8500_rtc = dev_get_drvdata(dev); | |
113 | u32 date, time; | |
114 | ||
115 | date = readl(vt8500_rtc->regbase + VT8500_RTC_DR); | |
116 | time = readl(vt8500_rtc->regbase + VT8500_RTC_TR); | |
117 | ||
118 | tm->tm_sec = bcd2bin(time & TIME_SEC_MASK); | |
119 | tm->tm_min = bcd2bin((time & TIME_MIN_MASK) >> TIME_MIN_S); | |
120 | tm->tm_hour = bcd2bin((time & TIME_HOUR_MASK) >> TIME_HOUR_S); | |
121 | tm->tm_mday = bcd2bin(date & DATE_DAY_MASK); | |
122 | tm->tm_mon = bcd2bin((date & DATE_MONTH_MASK) >> DATE_MONTH_S); | |
123 | tm->tm_year = bcd2bin((date & DATE_YEAR_MASK) >> DATE_YEAR_S) | |
124 | + ((date >> DATE_CENTURY_S) & 1 ? 200 : 100); | |
125 | tm->tm_wday = (time & TIME_DOW_MASK) >> TIME_DOW_S; | |
126 | ||
127 | return 0; | |
128 | } | |
129 | ||
130 | static int vt8500_rtc_set_time(struct device *dev, struct rtc_time *tm) | |
131 | { | |
132 | struct vt8500_rtc *vt8500_rtc = dev_get_drvdata(dev); | |
133 | ||
134 | if (tm->tm_year < 100) { | |
135 | dev_warn(dev, "Only years 2000-2199 are supported by the " | |
136 | "hardware!\n"); | |
137 | return -EINVAL; | |
138 | } | |
139 | ||
140 | writel((bin2bcd(tm->tm_year - 100) << DATE_YEAR_S) | |
141 | | (bin2bcd(tm->tm_mon) << DATE_MONTH_S) | |
142 | | (bin2bcd(tm->tm_mday)), | |
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 | ||
153 | static 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; | |
07187ee1 | 167 | alrm->pending = (isr & VT8500_RTC_IS_ALARM) ? 1 : 0; |
f77fbdf9 | 168 | |
f77fbdf9 AC |
169 | return rtc_valid_tm(&alrm->time); |
170 | } | |
171 | ||
172 | static 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 | ||
186 | static 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 | ||
f77fbdf9 AC |
200 | static 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, | |
f77fbdf9 AC |
206 | }; |
207 | ||
208 | static int __devinit vt8500_rtc_probe(struct platform_device *pdev) | |
209 | { | |
210 | struct vt8500_rtc *vt8500_rtc; | |
211 | int ret; | |
212 | ||
0d7ecb83 DN |
213 | vt8500_rtc = devm_kzalloc(&pdev->dev, |
214 | sizeof(struct vt8500_rtc), GFP_KERNEL); | |
f77fbdf9 AC |
215 | if (!vt8500_rtc) |
216 | return -ENOMEM; | |
217 | ||
218 | spin_lock_init(&vt8500_rtc->lock); | |
219 | platform_set_drvdata(pdev, vt8500_rtc); | |
220 | ||
221 | vt8500_rtc->res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
222 | if (!vt8500_rtc->res) { | |
223 | dev_err(&pdev->dev, "No I/O memory resource defined\n"); | |
0d7ecb83 | 224 | return -ENXIO; |
f77fbdf9 AC |
225 | } |
226 | ||
227 | vt8500_rtc->irq_alarm = platform_get_irq(pdev, 0); | |
228 | if (vt8500_rtc->irq_alarm < 0) { | |
229 | dev_err(&pdev->dev, "No alarm IRQ resource defined\n"); | |
0d7ecb83 | 230 | return -ENXIO; |
f77fbdf9 AC |
231 | } |
232 | ||
f77fbdf9 AC |
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"); | |
0d7ecb83 | 238 | return -EBUSY; |
f77fbdf9 AC |
239 | } |
240 | ||
241 | vt8500_rtc->regbase = ioremap(vt8500_rtc->res->start, | |
242 | resource_size(vt8500_rtc->res)); | |
243 | if (!vt8500_rtc->regbase) { | |
244 | dev_err(&pdev->dev, "Unable to map RTC I/O memory\n"); | |
245 | ret = -EBUSY; | |
246 | goto err_release; | |
247 | } | |
248 | ||
03ad2d50 AC |
249 | /* Enable RTC and set it to 24-hour mode */ |
250 | writel(VT8500_RTC_CR_ENABLE | VT8500_RTC_CR_24H, | |
f77fbdf9 AC |
251 | vt8500_rtc->regbase + VT8500_RTC_CR); |
252 | ||
253 | vt8500_rtc->rtc = rtc_device_register("vt8500-rtc", &pdev->dev, | |
254 | &vt8500_rtc_ops, THIS_MODULE); | |
255 | if (IS_ERR(vt8500_rtc->rtc)) { | |
256 | ret = PTR_ERR(vt8500_rtc->rtc); | |
257 | dev_err(&pdev->dev, | |
258 | "Failed to register RTC device -> %d\n", ret); | |
259 | goto err_unmap; | |
260 | } | |
261 | ||
f77fbdf9 AC |
262 | ret = request_irq(vt8500_rtc->irq_alarm, vt8500_rtc_irq, 0, |
263 | "rtc alarm", vt8500_rtc); | |
264 | if (ret < 0) { | |
265 | dev_err(&pdev->dev, "can't get irq %i, err %d\n", | |
266 | vt8500_rtc->irq_alarm, ret); | |
03ad2d50 | 267 | goto err_unreg; |
f77fbdf9 AC |
268 | } |
269 | ||
270 | return 0; | |
271 | ||
f77fbdf9 AC |
272 | err_unreg: |
273 | rtc_device_unregister(vt8500_rtc->rtc); | |
274 | err_unmap: | |
275 | iounmap(vt8500_rtc->regbase); | |
276 | err_release: | |
277 | release_mem_region(vt8500_rtc->res->start, | |
278 | resource_size(vt8500_rtc->res)); | |
f77fbdf9 AC |
279 | return ret; |
280 | } | |
281 | ||
282 | static int __devexit vt8500_rtc_remove(struct platform_device *pdev) | |
283 | { | |
284 | struct vt8500_rtc *vt8500_rtc = platform_get_drvdata(pdev); | |
285 | ||
286 | free_irq(vt8500_rtc->irq_alarm, vt8500_rtc); | |
f77fbdf9 AC |
287 | |
288 | rtc_device_unregister(vt8500_rtc->rtc); | |
289 | ||
290 | /* Disable alarm matching */ | |
291 | writel(0, vt8500_rtc->regbase + VT8500_RTC_IS); | |
292 | iounmap(vt8500_rtc->regbase); | |
293 | release_mem_region(vt8500_rtc->res->start, | |
294 | resource_size(vt8500_rtc->res)); | |
295 | ||
f77fbdf9 AC |
296 | platform_set_drvdata(pdev, NULL); |
297 | ||
298 | return 0; | |
299 | } | |
300 | ||
7f4b48b3 TP |
301 | static const struct of_device_id wmt_dt_ids[] = { |
302 | { .compatible = "via,vt8500-rtc", }, | |
303 | {} | |
304 | }; | |
305 | ||
f77fbdf9 AC |
306 | static struct platform_driver vt8500_rtc_driver = { |
307 | .probe = vt8500_rtc_probe, | |
308 | .remove = __devexit_p(vt8500_rtc_remove), | |
309 | .driver = { | |
310 | .name = "vt8500-rtc", | |
311 | .owner = THIS_MODULE, | |
7f4b48b3 | 312 | .of_match_table = of_match_ptr(wmt_dt_ids), |
f77fbdf9 AC |
313 | }, |
314 | }; | |
315 | ||
0c4eae66 | 316 | module_platform_driver(vt8500_rtc_driver); |
f77fbdf9 AC |
317 | |
318 | MODULE_AUTHOR("Alexey Charkov <alchark@gmail.com>"); | |
319 | MODULE_DESCRIPTION("VIA VT8500 SoC Realtime Clock Driver (RTC)"); | |
7f4b48b3 | 320 | MODULE_LICENSE("GPL v2"); |
f77fbdf9 | 321 | MODULE_ALIAS("platform:vt8500-rtc"); |