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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 | struct vt8500_rtc { | |
78 | void __iomem *regbase; | |
79 | struct resource *res; | |
80 | int irq_alarm; | |
81 | int irq_hz; | |
82 | struct rtc_device *rtc; | |
83 | spinlock_t lock; /* Protects this structure */ | |
84 | }; | |
85 | ||
86 | static irqreturn_t vt8500_rtc_irq(int irq, void *dev_id) | |
87 | { | |
88 | struct vt8500_rtc *vt8500_rtc = dev_id; | |
89 | u32 isr; | |
90 | unsigned long events = 0; | |
91 | ||
92 | spin_lock(&vt8500_rtc->lock); | |
93 | ||
94 | /* clear interrupt sources */ | |
95 | isr = readl(vt8500_rtc->regbase + VT8500_RTC_IS); | |
96 | writel(isr, vt8500_rtc->regbase + VT8500_RTC_IS); | |
97 | ||
98 | spin_unlock(&vt8500_rtc->lock); | |
99 | ||
100 | if (isr & 1) | |
101 | events |= RTC_AF | RTC_IRQF; | |
102 | ||
103 | /* Only second/minute interrupts are supported */ | |
104 | if (isr & 2) | |
105 | events |= RTC_UF | RTC_IRQF; | |
106 | ||
107 | rtc_update_irq(vt8500_rtc->rtc, 1, events); | |
108 | ||
109 | return IRQ_HANDLED; | |
110 | } | |
111 | ||
112 | static int vt8500_rtc_read_time(struct device *dev, struct rtc_time *tm) | |
113 | { | |
114 | struct vt8500_rtc *vt8500_rtc = dev_get_drvdata(dev); | |
115 | u32 date, time; | |
116 | ||
117 | date = readl(vt8500_rtc->regbase + VT8500_RTC_DR); | |
118 | time = readl(vt8500_rtc->regbase + VT8500_RTC_TR); | |
119 | ||
120 | tm->tm_sec = bcd2bin(time & TIME_SEC_MASK); | |
121 | tm->tm_min = bcd2bin((time & TIME_MIN_MASK) >> TIME_MIN_S); | |
122 | tm->tm_hour = bcd2bin((time & TIME_HOUR_MASK) >> TIME_HOUR_S); | |
123 | tm->tm_mday = bcd2bin(date & DATE_DAY_MASK); | |
124 | tm->tm_mon = bcd2bin((date & DATE_MONTH_MASK) >> DATE_MONTH_S); | |
125 | tm->tm_year = bcd2bin((date & DATE_YEAR_MASK) >> DATE_YEAR_S) | |
126 | + ((date >> DATE_CENTURY_S) & 1 ? 200 : 100); | |
127 | tm->tm_wday = (time & TIME_DOW_MASK) >> TIME_DOW_S; | |
128 | ||
129 | return 0; | |
130 | } | |
131 | ||
132 | static int vt8500_rtc_set_time(struct device *dev, struct rtc_time *tm) | |
133 | { | |
134 | struct vt8500_rtc *vt8500_rtc = dev_get_drvdata(dev); | |
135 | ||
136 | if (tm->tm_year < 100) { | |
137 | dev_warn(dev, "Only years 2000-2199 are supported by the " | |
138 | "hardware!\n"); | |
139 | return -EINVAL; | |
140 | } | |
141 | ||
142 | writel((bin2bcd(tm->tm_year - 100) << DATE_YEAR_S) | |
143 | | (bin2bcd(tm->tm_mon) << DATE_MONTH_S) | |
144 | | (bin2bcd(tm->tm_mday)), | |
145 | vt8500_rtc->regbase + VT8500_RTC_DS); | |
146 | writel((bin2bcd(tm->tm_wday) << TIME_DOW_S) | |
147 | | (bin2bcd(tm->tm_hour) << TIME_HOUR_S) | |
148 | | (bin2bcd(tm->tm_min) << TIME_MIN_S) | |
149 | | (bin2bcd(tm->tm_sec)), | |
150 | vt8500_rtc->regbase + VT8500_RTC_TS); | |
151 | ||
152 | return 0; | |
153 | } | |
154 | ||
155 | static int vt8500_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
156 | { | |
157 | struct vt8500_rtc *vt8500_rtc = dev_get_drvdata(dev); | |
158 | u32 isr, alarm; | |
159 | ||
160 | alarm = readl(vt8500_rtc->regbase + VT8500_RTC_AS); | |
161 | isr = readl(vt8500_rtc->regbase + VT8500_RTC_IS); | |
162 | ||
163 | alrm->time.tm_mday = bcd2bin((alarm & ALARM_DAY_MASK) >> ALARM_DAY_S); | |
164 | alrm->time.tm_hour = bcd2bin((alarm & TIME_HOUR_MASK) >> TIME_HOUR_S); | |
165 | alrm->time.tm_min = bcd2bin((alarm & TIME_MIN_MASK) >> TIME_MIN_S); | |
166 | alrm->time.tm_sec = bcd2bin((alarm & TIME_SEC_MASK)); | |
167 | ||
168 | alrm->enabled = (alarm & ALARM_ENABLE_MASK) ? 1 : 0; | |
169 | ||
170 | alrm->pending = (isr & 1) ? 1 : 0; | |
171 | return rtc_valid_tm(&alrm->time); | |
172 | } | |
173 | ||
174 | static int vt8500_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
175 | { | |
176 | struct vt8500_rtc *vt8500_rtc = dev_get_drvdata(dev); | |
177 | ||
178 | writel((alrm->enabled ? ALARM_ENABLE_MASK : 0) | |
179 | | (bin2bcd(alrm->time.tm_mday) << ALARM_DAY_S) | |
180 | | (bin2bcd(alrm->time.tm_hour) << TIME_HOUR_S) | |
181 | | (bin2bcd(alrm->time.tm_min) << TIME_MIN_S) | |
182 | | (bin2bcd(alrm->time.tm_sec)), | |
183 | vt8500_rtc->regbase + VT8500_RTC_AS); | |
184 | ||
185 | return 0; | |
186 | } | |
187 | ||
188 | static int vt8500_alarm_irq_enable(struct device *dev, unsigned int enabled) | |
189 | { | |
190 | struct vt8500_rtc *vt8500_rtc = dev_get_drvdata(dev); | |
191 | unsigned long tmp = readl(vt8500_rtc->regbase + VT8500_RTC_AS); | |
192 | ||
193 | if (enabled) | |
194 | tmp |= ALARM_ENABLE_MASK; | |
195 | else | |
196 | tmp &= ~ALARM_ENABLE_MASK; | |
197 | ||
198 | writel(tmp, vt8500_rtc->regbase + VT8500_RTC_AS); | |
199 | return 0; | |
200 | } | |
201 | ||
202 | static int vt8500_update_irq_enable(struct device *dev, unsigned int enabled) | |
203 | { | |
204 | struct vt8500_rtc *vt8500_rtc = dev_get_drvdata(dev); | |
205 | unsigned long tmp = readl(vt8500_rtc->regbase + VT8500_RTC_CR); | |
206 | ||
207 | if (enabled) | |
208 | tmp |= VT8500_RTC_CR_SM_SEC | VT8500_RTC_CR_SM_ENABLE; | |
209 | else | |
210 | tmp &= ~VT8500_RTC_CR_SM_ENABLE; | |
211 | ||
212 | writel(tmp, vt8500_rtc->regbase + VT8500_RTC_CR); | |
213 | return 0; | |
214 | } | |
215 | ||
216 | static const struct rtc_class_ops vt8500_rtc_ops = { | |
217 | .read_time = vt8500_rtc_read_time, | |
218 | .set_time = vt8500_rtc_set_time, | |
219 | .read_alarm = vt8500_rtc_read_alarm, | |
220 | .set_alarm = vt8500_rtc_set_alarm, | |
221 | .alarm_irq_enable = vt8500_alarm_irq_enable, | |
222 | .update_irq_enable = vt8500_update_irq_enable, | |
223 | }; | |
224 | ||
225 | static int __devinit vt8500_rtc_probe(struct platform_device *pdev) | |
226 | { | |
227 | struct vt8500_rtc *vt8500_rtc; | |
228 | int ret; | |
229 | ||
230 | vt8500_rtc = kzalloc(sizeof(struct vt8500_rtc), GFP_KERNEL); | |
231 | if (!vt8500_rtc) | |
232 | return -ENOMEM; | |
233 | ||
234 | spin_lock_init(&vt8500_rtc->lock); | |
235 | platform_set_drvdata(pdev, vt8500_rtc); | |
236 | ||
237 | vt8500_rtc->res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
238 | if (!vt8500_rtc->res) { | |
239 | dev_err(&pdev->dev, "No I/O memory resource defined\n"); | |
240 | ret = -ENXIO; | |
241 | goto err_free; | |
242 | } | |
243 | ||
244 | vt8500_rtc->irq_alarm = platform_get_irq(pdev, 0); | |
245 | if (vt8500_rtc->irq_alarm < 0) { | |
246 | dev_err(&pdev->dev, "No alarm IRQ resource defined\n"); | |
247 | ret = -ENXIO; | |
248 | goto err_free; | |
249 | } | |
250 | ||
251 | vt8500_rtc->irq_hz = platform_get_irq(pdev, 1); | |
252 | if (vt8500_rtc->irq_hz < 0) { | |
253 | dev_err(&pdev->dev, "No 1Hz IRQ resource defined\n"); | |
254 | ret = -ENXIO; | |
255 | goto err_free; | |
256 | } | |
257 | ||
258 | vt8500_rtc->res = request_mem_region(vt8500_rtc->res->start, | |
259 | resource_size(vt8500_rtc->res), | |
260 | "vt8500-rtc"); | |
261 | if (vt8500_rtc->res == NULL) { | |
262 | dev_err(&pdev->dev, "failed to request I/O memory\n"); | |
263 | ret = -EBUSY; | |
264 | goto err_free; | |
265 | } | |
266 | ||
267 | vt8500_rtc->regbase = ioremap(vt8500_rtc->res->start, | |
268 | resource_size(vt8500_rtc->res)); | |
269 | if (!vt8500_rtc->regbase) { | |
270 | dev_err(&pdev->dev, "Unable to map RTC I/O memory\n"); | |
271 | ret = -EBUSY; | |
272 | goto err_release; | |
273 | } | |
274 | ||
275 | /* Enable the second/minute interrupt generation and enable RTC */ | |
276 | writel(VT8500_RTC_CR_ENABLE | VT8500_RTC_CR_24H | |
277 | | VT8500_RTC_CR_SM_ENABLE | VT8500_RTC_CR_SM_SEC, | |
278 | vt8500_rtc->regbase + VT8500_RTC_CR); | |
279 | ||
280 | vt8500_rtc->rtc = rtc_device_register("vt8500-rtc", &pdev->dev, | |
281 | &vt8500_rtc_ops, THIS_MODULE); | |
282 | if (IS_ERR(vt8500_rtc->rtc)) { | |
283 | ret = PTR_ERR(vt8500_rtc->rtc); | |
284 | dev_err(&pdev->dev, | |
285 | "Failed to register RTC device -> %d\n", ret); | |
286 | goto err_unmap; | |
287 | } | |
288 | ||
289 | ret = request_irq(vt8500_rtc->irq_hz, vt8500_rtc_irq, 0, | |
290 | "rtc 1Hz", vt8500_rtc); | |
291 | if (ret < 0) { | |
292 | dev_err(&pdev->dev, "can't get irq %i, err %d\n", | |
293 | vt8500_rtc->irq_hz, ret); | |
294 | goto err_unreg; | |
295 | } | |
296 | ||
297 | ret = request_irq(vt8500_rtc->irq_alarm, vt8500_rtc_irq, 0, | |
298 | "rtc alarm", vt8500_rtc); | |
299 | if (ret < 0) { | |
300 | dev_err(&pdev->dev, "can't get irq %i, err %d\n", | |
301 | vt8500_rtc->irq_alarm, ret); | |
302 | goto err_free_hz; | |
303 | } | |
304 | ||
305 | return 0; | |
306 | ||
307 | err_free_hz: | |
308 | free_irq(vt8500_rtc->irq_hz, vt8500_rtc); | |
309 | err_unreg: | |
310 | rtc_device_unregister(vt8500_rtc->rtc); | |
311 | err_unmap: | |
312 | iounmap(vt8500_rtc->regbase); | |
313 | err_release: | |
314 | release_mem_region(vt8500_rtc->res->start, | |
315 | resource_size(vt8500_rtc->res)); | |
316 | err_free: | |
317 | kfree(vt8500_rtc); | |
318 | return ret; | |
319 | } | |
320 | ||
321 | static int __devexit vt8500_rtc_remove(struct platform_device *pdev) | |
322 | { | |
323 | struct vt8500_rtc *vt8500_rtc = platform_get_drvdata(pdev); | |
324 | ||
325 | free_irq(vt8500_rtc->irq_alarm, vt8500_rtc); | |
326 | free_irq(vt8500_rtc->irq_hz, vt8500_rtc); | |
327 | ||
328 | rtc_device_unregister(vt8500_rtc->rtc); | |
329 | ||
330 | /* Disable alarm matching */ | |
331 | writel(0, vt8500_rtc->regbase + VT8500_RTC_IS); | |
332 | iounmap(vt8500_rtc->regbase); | |
333 | release_mem_region(vt8500_rtc->res->start, | |
334 | resource_size(vt8500_rtc->res)); | |
335 | ||
336 | kfree(vt8500_rtc); | |
337 | platform_set_drvdata(pdev, NULL); | |
338 | ||
339 | return 0; | |
340 | } | |
341 | ||
342 | static struct platform_driver vt8500_rtc_driver = { | |
343 | .probe = vt8500_rtc_probe, | |
344 | .remove = __devexit_p(vt8500_rtc_remove), | |
345 | .driver = { | |
346 | .name = "vt8500-rtc", | |
347 | .owner = THIS_MODULE, | |
348 | }, | |
349 | }; | |
350 | ||
351 | static int __init vt8500_rtc_init(void) | |
352 | { | |
353 | return platform_driver_register(&vt8500_rtc_driver); | |
354 | } | |
355 | module_init(vt8500_rtc_init); | |
356 | ||
357 | static void __exit vt8500_rtc_exit(void) | |
358 | { | |
359 | platform_driver_unregister(&vt8500_rtc_driver); | |
360 | } | |
361 | module_exit(vt8500_rtc_exit); | |
362 | ||
363 | MODULE_AUTHOR("Alexey Charkov <alchark@gmail.com>"); | |
364 | MODULE_DESCRIPTION("VIA VT8500 SoC Realtime Clock Driver (RTC)"); | |
365 | MODULE_LICENSE("GPL"); | |
366 | MODULE_ALIAS("platform:vt8500-rtc"); |