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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> | |
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 | ||
07187ee1 WS |
77 | #define VT8500_RTC_IS_ALARM (1 << 0) /* Alarm interrupt status */ |
78 | ||
f77fbdf9 AC |
79 | struct vt8500_rtc { |
80 | void __iomem *regbase; | |
81 | struct resource *res; | |
82 | int irq_alarm; | |
f77fbdf9 AC |
83 | struct rtc_device *rtc; |
84 | spinlock_t lock; /* Protects this structure */ | |
85 | }; | |
86 | ||
87 | static 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 | ||
07187ee1 | 101 | if (isr & VT8500_RTC_IS_ALARM) |
f77fbdf9 AC |
102 | events |= RTC_AF | RTC_IRQF; |
103 | ||
f77fbdf9 AC |
104 | rtc_update_irq(vt8500_rtc->rtc, 1, events); |
105 | ||
106 | return IRQ_HANDLED; | |
107 | } | |
108 | ||
109 | static 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 | ||
129 | static 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 | ||
152 | static 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; | |
07187ee1 | 166 | alrm->pending = (isr & VT8500_RTC_IS_ALARM) ? 1 : 0; |
f77fbdf9 | 167 | |
f77fbdf9 AC |
168 | return rtc_valid_tm(&alrm->time); |
169 | } | |
170 | ||
171 | static 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 | ||
185 | static 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 | ||
f77fbdf9 AC |
199 | static 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, | |
f77fbdf9 AC |
205 | }; |
206 | ||
207 | static 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 | ||
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"); | |
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 | ||
03ad2d50 AC |
250 | /* Enable RTC and set it to 24-hour mode */ |
251 | writel(VT8500_RTC_CR_ENABLE | VT8500_RTC_CR_24H, | |
f77fbdf9 AC |
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 | ||
f77fbdf9 AC |
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); | |
03ad2d50 | 268 | goto err_unreg; |
f77fbdf9 AC |
269 | } |
270 | ||
271 | return 0; | |
272 | ||
f77fbdf9 AC |
273 | err_unreg: |
274 | rtc_device_unregister(vt8500_rtc->rtc); | |
275 | err_unmap: | |
276 | iounmap(vt8500_rtc->regbase); | |
277 | err_release: | |
278 | release_mem_region(vt8500_rtc->res->start, | |
279 | resource_size(vt8500_rtc->res)); | |
280 | err_free: | |
281 | kfree(vt8500_rtc); | |
282 | return ret; | |
283 | } | |
284 | ||
285 | static 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); | |
f77fbdf9 AC |
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 | ||
305 | static 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 | ||
0c4eae66 | 314 | module_platform_driver(vt8500_rtc_driver); |
f77fbdf9 AC |
315 | |
316 | MODULE_AUTHOR("Alexey Charkov <alchark@gmail.com>"); | |
317 | MODULE_DESCRIPTION("VIA VT8500 SoC Realtime Clock Driver (RTC)"); | |
318 | MODULE_LICENSE("GPL"); | |
319 | MODULE_ALIAS("platform:vt8500-rtc"); |