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afd49a7e WZ |
1 | /* |
2 | * Copyright (c) 2008-2009 Nuvoton technology corporation. | |
3 | * | |
4 | * Wan ZongShun <mcuos.com@gmail.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation;version 2 of the License. | |
9 | * | |
10 | */ | |
11 | ||
12 | #include <linux/module.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/platform_device.h> | |
5a0e3ad6 | 15 | #include <linux/slab.h> |
afd49a7e WZ |
16 | #include <linux/rtc.h> |
17 | #include <linux/delay.h> | |
18 | #include <linux/io.h> | |
19 | #include <linux/bcd.h> | |
20 | ||
21 | /* RTC Control Registers */ | |
22 | #define REG_RTC_INIR 0x00 | |
23 | #define REG_RTC_AER 0x04 | |
24 | #define REG_RTC_FCR 0x08 | |
25 | #define REG_RTC_TLR 0x0C | |
26 | #define REG_RTC_CLR 0x10 | |
27 | #define REG_RTC_TSSR 0x14 | |
28 | #define REG_RTC_DWR 0x18 | |
29 | #define REG_RTC_TAR 0x1C | |
30 | #define REG_RTC_CAR 0x20 | |
31 | #define REG_RTC_LIR 0x24 | |
32 | #define REG_RTC_RIER 0x28 | |
33 | #define REG_RTC_RIIR 0x2C | |
34 | #define REG_RTC_TTR 0x30 | |
35 | ||
36 | #define RTCSET 0x01 | |
37 | #define AERRWENB 0x10000 | |
38 | #define INIRRESET 0xa5eb1357 | |
39 | #define AERPOWERON 0xA965 | |
40 | #define AERPOWEROFF 0x0000 | |
41 | #define LEAPYEAR 0x0001 | |
42 | #define TICKENB 0x80 | |
43 | #define TICKINTENB 0x0002 | |
44 | #define ALARMINTENB 0x0001 | |
45 | #define MODE24 0x0001 | |
46 | ||
47 | struct nuc900_rtc { | |
48 | int irq_num; | |
49 | void __iomem *rtc_reg; | |
50 | struct rtc_device *rtcdev; | |
51 | }; | |
52 | ||
53 | struct nuc900_bcd_time { | |
54 | int bcd_sec; | |
55 | int bcd_min; | |
56 | int bcd_hour; | |
57 | int bcd_mday; | |
58 | int bcd_mon; | |
59 | int bcd_year; | |
60 | }; | |
61 | ||
62 | static irqreturn_t nuc900_rtc_interrupt(int irq, void *_rtc) | |
63 | { | |
64 | struct nuc900_rtc *rtc = _rtc; | |
65 | unsigned long events = 0, rtc_irq; | |
66 | ||
67 | rtc_irq = __raw_readl(rtc->rtc_reg + REG_RTC_RIIR); | |
68 | ||
69 | if (rtc_irq & ALARMINTENB) { | |
70 | rtc_irq &= ~ALARMINTENB; | |
71 | __raw_writel(rtc_irq, rtc->rtc_reg + REG_RTC_RIIR); | |
72 | events |= RTC_AF | RTC_IRQF; | |
73 | } | |
74 | ||
75 | if (rtc_irq & TICKINTENB) { | |
76 | rtc_irq &= ~TICKINTENB; | |
77 | __raw_writel(rtc_irq, rtc->rtc_reg + REG_RTC_RIIR); | |
78 | events |= RTC_UF | RTC_IRQF; | |
79 | } | |
80 | ||
81 | rtc_update_irq(rtc->rtcdev, 1, events); | |
82 | ||
83 | return IRQ_HANDLED; | |
84 | } | |
85 | ||
86 | static int *check_rtc_access_enable(struct nuc900_rtc *nuc900_rtc) | |
87 | { | |
0a89b553 | 88 | unsigned int i, timeout = 0x1000; |
afd49a7e WZ |
89 | __raw_writel(INIRRESET, nuc900_rtc->rtc_reg + REG_RTC_INIR); |
90 | ||
91 | mdelay(10); | |
92 | ||
93 | __raw_writel(AERPOWERON, nuc900_rtc->rtc_reg + REG_RTC_AER); | |
94 | ||
0a89b553 WZ |
95 | while (!(__raw_readl(nuc900_rtc->rtc_reg + REG_RTC_AER) & AERRWENB) |
96 | && timeout--) | |
97 | mdelay(1); | |
afd49a7e | 98 | |
0a89b553 WZ |
99 | if (!timeout) |
100 | return ERR_PTR(-EPERM); | |
afd49a7e | 101 | |
0a89b553 | 102 | return 0; |
afd49a7e WZ |
103 | } |
104 | ||
105 | static void nuc900_rtc_bcd2bin(unsigned int timereg, | |
106 | unsigned int calreg, struct rtc_time *tm) | |
107 | { | |
108 | tm->tm_mday = bcd2bin(calreg >> 0); | |
109 | tm->tm_mon = bcd2bin(calreg >> 8); | |
110 | tm->tm_year = bcd2bin(calreg >> 16) + 100; | |
111 | ||
112 | tm->tm_sec = bcd2bin(timereg >> 0); | |
113 | tm->tm_min = bcd2bin(timereg >> 8); | |
114 | tm->tm_hour = bcd2bin(timereg >> 16); | |
115 | ||
116 | rtc_valid_tm(tm); | |
117 | } | |
118 | ||
70d2a0ba | 119 | static void nuc900_rtc_bin2bcd(struct device *dev, struct rtc_time *settm, |
afd49a7e WZ |
120 | struct nuc900_bcd_time *gettm) |
121 | { | |
122 | gettm->bcd_mday = bin2bcd(settm->tm_mday) << 0; | |
123 | gettm->bcd_mon = bin2bcd(settm->tm_mon) << 8; | |
70d2a0ba WZ |
124 | |
125 | if (settm->tm_year < 100) { | |
126 | dev_warn(dev, "The year will be between 1970-1999, right?\n"); | |
127 | gettm->bcd_year = bin2bcd(settm->tm_year) << 16; | |
128 | } else { | |
129 | gettm->bcd_year = bin2bcd(settm->tm_year - 100) << 16; | |
130 | } | |
afd49a7e WZ |
131 | |
132 | gettm->bcd_sec = bin2bcd(settm->tm_sec) << 0; | |
133 | gettm->bcd_min = bin2bcd(settm->tm_min) << 8; | |
134 | gettm->bcd_hour = bin2bcd(settm->tm_hour) << 16; | |
135 | } | |
136 | ||
137 | static int nuc900_update_irq_enable(struct device *dev, unsigned int enabled) | |
138 | { | |
139 | struct nuc900_rtc *rtc = dev_get_drvdata(dev); | |
140 | ||
141 | if (enabled) | |
142 | __raw_writel(__raw_readl(rtc->rtc_reg + REG_RTC_RIER)| | |
143 | (TICKINTENB), rtc->rtc_reg + REG_RTC_RIER); | |
144 | else | |
145 | __raw_writel(__raw_readl(rtc->rtc_reg + REG_RTC_RIER)& | |
146 | (~TICKINTENB), rtc->rtc_reg + REG_RTC_RIER); | |
147 | ||
148 | return 0; | |
149 | } | |
150 | ||
151 | static int nuc900_alarm_irq_enable(struct device *dev, unsigned int enabled) | |
152 | { | |
153 | struct nuc900_rtc *rtc = dev_get_drvdata(dev); | |
154 | ||
155 | if (enabled) | |
156 | __raw_writel(__raw_readl(rtc->rtc_reg + REG_RTC_RIER)| | |
157 | (ALARMINTENB), rtc->rtc_reg + REG_RTC_RIER); | |
158 | else | |
159 | __raw_writel(__raw_readl(rtc->rtc_reg + REG_RTC_RIER)& | |
160 | (~ALARMINTENB), rtc->rtc_reg + REG_RTC_RIER); | |
161 | ||
162 | return 0; | |
163 | } | |
164 | ||
165 | static int nuc900_rtc_read_time(struct device *dev, struct rtc_time *tm) | |
166 | { | |
167 | struct nuc900_rtc *rtc = dev_get_drvdata(dev); | |
168 | unsigned int timeval, clrval; | |
169 | ||
170 | timeval = __raw_readl(rtc->rtc_reg + REG_RTC_TLR); | |
171 | clrval = __raw_readl(rtc->rtc_reg + REG_RTC_CLR); | |
172 | ||
173 | nuc900_rtc_bcd2bin(timeval, clrval, tm); | |
174 | ||
175 | return 0; | |
176 | } | |
177 | ||
178 | static int nuc900_rtc_set_time(struct device *dev, struct rtc_time *tm) | |
179 | { | |
180 | struct nuc900_rtc *rtc = dev_get_drvdata(dev); | |
181 | struct nuc900_bcd_time gettm; | |
182 | unsigned long val; | |
183 | int *err; | |
184 | ||
70d2a0ba | 185 | nuc900_rtc_bin2bcd(dev, tm, &gettm); |
afd49a7e WZ |
186 | |
187 | err = check_rtc_access_enable(rtc); | |
188 | if (IS_ERR(err)) | |
189 | return PTR_ERR(err); | |
190 | ||
191 | val = gettm.bcd_mday | gettm.bcd_mon | gettm.bcd_year; | |
192 | __raw_writel(val, rtc->rtc_reg + REG_RTC_CLR); | |
193 | ||
194 | val = gettm.bcd_sec | gettm.bcd_min | gettm.bcd_hour; | |
195 | __raw_writel(val, rtc->rtc_reg + REG_RTC_TLR); | |
196 | ||
197 | return 0; | |
198 | } | |
199 | ||
200 | static int nuc900_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
201 | { | |
202 | struct nuc900_rtc *rtc = dev_get_drvdata(dev); | |
203 | unsigned int timeval, carval; | |
204 | ||
205 | timeval = __raw_readl(rtc->rtc_reg + REG_RTC_TAR); | |
206 | carval = __raw_readl(rtc->rtc_reg + REG_RTC_CAR); | |
207 | ||
208 | nuc900_rtc_bcd2bin(timeval, carval, &alrm->time); | |
209 | ||
210 | return 0; | |
211 | } | |
212 | ||
213 | static int nuc900_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
214 | { | |
215 | struct nuc900_rtc *rtc = dev_get_drvdata(dev); | |
216 | struct nuc900_bcd_time tm; | |
217 | unsigned long val; | |
218 | int *err; | |
219 | ||
70d2a0ba | 220 | nuc900_rtc_bin2bcd(dev, &alrm->time, &tm); |
afd49a7e WZ |
221 | |
222 | err = check_rtc_access_enable(rtc); | |
223 | if (IS_ERR(err)) | |
224 | return PTR_ERR(err); | |
225 | ||
226 | val = tm.bcd_mday | tm.bcd_mon | tm.bcd_year; | |
227 | __raw_writel(val, rtc->rtc_reg + REG_RTC_CAR); | |
228 | ||
229 | val = tm.bcd_sec | tm.bcd_min | tm.bcd_hour; | |
230 | __raw_writel(val, rtc->rtc_reg + REG_RTC_TAR); | |
231 | ||
232 | return 0; | |
233 | } | |
234 | ||
235 | static struct rtc_class_ops nuc900_rtc_ops = { | |
236 | .read_time = nuc900_rtc_read_time, | |
237 | .set_time = nuc900_rtc_set_time, | |
238 | .read_alarm = nuc900_rtc_read_alarm, | |
239 | .set_alarm = nuc900_rtc_set_alarm, | |
240 | .alarm_irq_enable = nuc900_alarm_irq_enable, | |
241 | .update_irq_enable = nuc900_update_irq_enable, | |
242 | }; | |
243 | ||
244 | static int __devinit nuc900_rtc_probe(struct platform_device *pdev) | |
245 | { | |
246 | struct resource *res; | |
247 | struct nuc900_rtc *nuc900_rtc; | |
248 | int err = 0; | |
249 | ||
250 | nuc900_rtc = kzalloc(sizeof(struct nuc900_rtc), GFP_KERNEL); | |
251 | if (!nuc900_rtc) { | |
252 | dev_err(&pdev->dev, "kzalloc nuc900_rtc failed\n"); | |
253 | return -ENOMEM; | |
254 | } | |
255 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
256 | if (!res) { | |
257 | dev_err(&pdev->dev, "platform_get_resource failed\n"); | |
258 | err = -ENXIO; | |
259 | goto fail1; | |
260 | } | |
261 | ||
262 | if (!request_mem_region(res->start, resource_size(res), | |
263 | pdev->name)) { | |
264 | dev_err(&pdev->dev, "request_mem_region failed\n"); | |
265 | err = -EBUSY; | |
266 | goto fail1; | |
267 | } | |
268 | ||
269 | nuc900_rtc->rtc_reg = ioremap(res->start, resource_size(res)); | |
270 | if (!nuc900_rtc->rtc_reg) { | |
271 | dev_err(&pdev->dev, "ioremap rtc_reg failed\n"); | |
272 | err = -ENOMEM; | |
273 | goto fail2; | |
274 | } | |
275 | ||
276 | nuc900_rtc->irq_num = platform_get_irq(pdev, 0); | |
277 | if (request_irq(nuc900_rtc->irq_num, nuc900_rtc_interrupt, | |
278 | IRQF_DISABLED, "nuc900rtc", nuc900_rtc)) { | |
279 | dev_err(&pdev->dev, "NUC900 RTC request irq failed\n"); | |
280 | err = -EBUSY; | |
281 | goto fail3; | |
282 | } | |
283 | ||
284 | nuc900_rtc->rtcdev = rtc_device_register(pdev->name, &pdev->dev, | |
285 | &nuc900_rtc_ops, THIS_MODULE); | |
286 | if (IS_ERR(nuc900_rtc->rtcdev)) { | |
287 | dev_err(&pdev->dev, "rtc device register faild\n"); | |
288 | err = PTR_ERR(nuc900_rtc->rtcdev); | |
289 | goto fail4; | |
290 | } | |
291 | ||
292 | platform_set_drvdata(pdev, nuc900_rtc); | |
293 | __raw_writel(__raw_readl(nuc900_rtc->rtc_reg + REG_RTC_TSSR) | MODE24, | |
294 | nuc900_rtc->rtc_reg + REG_RTC_TSSR); | |
295 | ||
296 | return 0; | |
297 | ||
298 | fail4: free_irq(nuc900_rtc->irq_num, nuc900_rtc); | |
299 | fail3: iounmap(nuc900_rtc->rtc_reg); | |
300 | fail2: release_mem_region(res->start, resource_size(res)); | |
301 | fail1: kfree(nuc900_rtc); | |
302 | return err; | |
303 | } | |
304 | ||
305 | static int __devexit nuc900_rtc_remove(struct platform_device *pdev) | |
306 | { | |
307 | struct nuc900_rtc *nuc900_rtc = platform_get_drvdata(pdev); | |
308 | struct resource *res; | |
309 | ||
310 | rtc_device_unregister(nuc900_rtc->rtcdev); | |
311 | free_irq(nuc900_rtc->irq_num, nuc900_rtc); | |
312 | iounmap(nuc900_rtc->rtc_reg); | |
313 | ||
314 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
315 | release_mem_region(res->start, resource_size(res)); | |
316 | ||
317 | kfree(nuc900_rtc); | |
318 | ||
319 | platform_set_drvdata(pdev, NULL); | |
320 | ||
321 | return 0; | |
322 | } | |
323 | ||
324 | static struct platform_driver nuc900_rtc_driver = { | |
325 | .remove = __devexit_p(nuc900_rtc_remove), | |
326 | .driver = { | |
327 | .name = "nuc900-rtc", | |
328 | .owner = THIS_MODULE, | |
329 | }, | |
330 | }; | |
331 | ||
332 | static int __init nuc900_rtc_init(void) | |
333 | { | |
334 | return platform_driver_probe(&nuc900_rtc_driver, nuc900_rtc_probe); | |
335 | } | |
336 | ||
337 | static void __exit nuc900_rtc_exit(void) | |
338 | { | |
339 | platform_driver_unregister(&nuc900_rtc_driver); | |
340 | } | |
341 | ||
342 | module_init(nuc900_rtc_init); | |
343 | module_exit(nuc900_rtc_exit); | |
344 | ||
345 | MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>"); | |
346 | MODULE_DESCRIPTION("nuc910/nuc920 RTC driver"); | |
347 | MODULE_LICENSE("GPL"); | |
348 | MODULE_ALIAS("platform:nuc900-rtc"); |