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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 | { | |
88 | unsigned int i; | |
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 | ||
95 | for (i = 0; i < 1000; i++) { | |
96 | if (__raw_readl(nuc900_rtc->rtc_reg + REG_RTC_AER) & AERRWENB) | |
97 | return 0; | |
98 | } | |
99 | ||
100 | if ((__raw_readl(nuc900_rtc->rtc_reg + REG_RTC_AER) & AERRWENB) == 0x0) | |
101 | return ERR_PTR(-ENODEV); | |
102 | ||
103 | return ERR_PTR(-EPERM); | |
104 | } | |
105 | ||
106 | static void nuc900_rtc_bcd2bin(unsigned int timereg, | |
107 | unsigned int calreg, struct rtc_time *tm) | |
108 | { | |
109 | tm->tm_mday = bcd2bin(calreg >> 0); | |
110 | tm->tm_mon = bcd2bin(calreg >> 8); | |
111 | tm->tm_year = bcd2bin(calreg >> 16) + 100; | |
112 | ||
113 | tm->tm_sec = bcd2bin(timereg >> 0); | |
114 | tm->tm_min = bcd2bin(timereg >> 8); | |
115 | tm->tm_hour = bcd2bin(timereg >> 16); | |
116 | ||
117 | rtc_valid_tm(tm); | |
118 | } | |
119 | ||
120 | static void nuc900_rtc_bin2bcd(struct rtc_time *settm, | |
121 | struct nuc900_bcd_time *gettm) | |
122 | { | |
123 | gettm->bcd_mday = bin2bcd(settm->tm_mday) << 0; | |
124 | gettm->bcd_mon = bin2bcd(settm->tm_mon) << 8; | |
125 | gettm->bcd_year = bin2bcd(settm->tm_year - 100) << 16; | |
126 | ||
127 | gettm->bcd_sec = bin2bcd(settm->tm_sec) << 0; | |
128 | gettm->bcd_min = bin2bcd(settm->tm_min) << 8; | |
129 | gettm->bcd_hour = bin2bcd(settm->tm_hour) << 16; | |
130 | } | |
131 | ||
132 | static int nuc900_update_irq_enable(struct device *dev, unsigned int enabled) | |
133 | { | |
134 | struct nuc900_rtc *rtc = dev_get_drvdata(dev); | |
135 | ||
136 | if (enabled) | |
137 | __raw_writel(__raw_readl(rtc->rtc_reg + REG_RTC_RIER)| | |
138 | (TICKINTENB), rtc->rtc_reg + REG_RTC_RIER); | |
139 | else | |
140 | __raw_writel(__raw_readl(rtc->rtc_reg + REG_RTC_RIER)& | |
141 | (~TICKINTENB), rtc->rtc_reg + REG_RTC_RIER); | |
142 | ||
143 | return 0; | |
144 | } | |
145 | ||
146 | static int nuc900_alarm_irq_enable(struct device *dev, unsigned int enabled) | |
147 | { | |
148 | struct nuc900_rtc *rtc = dev_get_drvdata(dev); | |
149 | ||
150 | if (enabled) | |
151 | __raw_writel(__raw_readl(rtc->rtc_reg + REG_RTC_RIER)| | |
152 | (ALARMINTENB), rtc->rtc_reg + REG_RTC_RIER); | |
153 | else | |
154 | __raw_writel(__raw_readl(rtc->rtc_reg + REG_RTC_RIER)& | |
155 | (~ALARMINTENB), rtc->rtc_reg + REG_RTC_RIER); | |
156 | ||
157 | return 0; | |
158 | } | |
159 | ||
160 | static int nuc900_rtc_read_time(struct device *dev, struct rtc_time *tm) | |
161 | { | |
162 | struct nuc900_rtc *rtc = dev_get_drvdata(dev); | |
163 | unsigned int timeval, clrval; | |
164 | ||
165 | timeval = __raw_readl(rtc->rtc_reg + REG_RTC_TLR); | |
166 | clrval = __raw_readl(rtc->rtc_reg + REG_RTC_CLR); | |
167 | ||
168 | nuc900_rtc_bcd2bin(timeval, clrval, tm); | |
169 | ||
170 | return 0; | |
171 | } | |
172 | ||
173 | static int nuc900_rtc_set_time(struct device *dev, struct rtc_time *tm) | |
174 | { | |
175 | struct nuc900_rtc *rtc = dev_get_drvdata(dev); | |
176 | struct nuc900_bcd_time gettm; | |
177 | unsigned long val; | |
178 | int *err; | |
179 | ||
180 | nuc900_rtc_bin2bcd(tm, &gettm); | |
181 | ||
182 | err = check_rtc_access_enable(rtc); | |
183 | if (IS_ERR(err)) | |
184 | return PTR_ERR(err); | |
185 | ||
186 | val = gettm.bcd_mday | gettm.bcd_mon | gettm.bcd_year; | |
187 | __raw_writel(val, rtc->rtc_reg + REG_RTC_CLR); | |
188 | ||
189 | val = gettm.bcd_sec | gettm.bcd_min | gettm.bcd_hour; | |
190 | __raw_writel(val, rtc->rtc_reg + REG_RTC_TLR); | |
191 | ||
192 | return 0; | |
193 | } | |
194 | ||
195 | static int nuc900_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
196 | { | |
197 | struct nuc900_rtc *rtc = dev_get_drvdata(dev); | |
198 | unsigned int timeval, carval; | |
199 | ||
200 | timeval = __raw_readl(rtc->rtc_reg + REG_RTC_TAR); | |
201 | carval = __raw_readl(rtc->rtc_reg + REG_RTC_CAR); | |
202 | ||
203 | nuc900_rtc_bcd2bin(timeval, carval, &alrm->time); | |
204 | ||
205 | return 0; | |
206 | } | |
207 | ||
208 | static int nuc900_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
209 | { | |
210 | struct nuc900_rtc *rtc = dev_get_drvdata(dev); | |
211 | struct nuc900_bcd_time tm; | |
212 | unsigned long val; | |
213 | int *err; | |
214 | ||
215 | nuc900_rtc_bin2bcd(&alrm->time, &tm); | |
216 | ||
217 | err = check_rtc_access_enable(rtc); | |
218 | if (IS_ERR(err)) | |
219 | return PTR_ERR(err); | |
220 | ||
221 | val = tm.bcd_mday | tm.bcd_mon | tm.bcd_year; | |
222 | __raw_writel(val, rtc->rtc_reg + REG_RTC_CAR); | |
223 | ||
224 | val = tm.bcd_sec | tm.bcd_min | tm.bcd_hour; | |
225 | __raw_writel(val, rtc->rtc_reg + REG_RTC_TAR); | |
226 | ||
227 | return 0; | |
228 | } | |
229 | ||
230 | static struct rtc_class_ops nuc900_rtc_ops = { | |
231 | .read_time = nuc900_rtc_read_time, | |
232 | .set_time = nuc900_rtc_set_time, | |
233 | .read_alarm = nuc900_rtc_read_alarm, | |
234 | .set_alarm = nuc900_rtc_set_alarm, | |
235 | .alarm_irq_enable = nuc900_alarm_irq_enable, | |
236 | .update_irq_enable = nuc900_update_irq_enable, | |
237 | }; | |
238 | ||
239 | static int __devinit nuc900_rtc_probe(struct platform_device *pdev) | |
240 | { | |
241 | struct resource *res; | |
242 | struct nuc900_rtc *nuc900_rtc; | |
243 | int err = 0; | |
244 | ||
245 | nuc900_rtc = kzalloc(sizeof(struct nuc900_rtc), GFP_KERNEL); | |
246 | if (!nuc900_rtc) { | |
247 | dev_err(&pdev->dev, "kzalloc nuc900_rtc failed\n"); | |
248 | return -ENOMEM; | |
249 | } | |
250 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
251 | if (!res) { | |
252 | dev_err(&pdev->dev, "platform_get_resource failed\n"); | |
253 | err = -ENXIO; | |
254 | goto fail1; | |
255 | } | |
256 | ||
257 | if (!request_mem_region(res->start, resource_size(res), | |
258 | pdev->name)) { | |
259 | dev_err(&pdev->dev, "request_mem_region failed\n"); | |
260 | err = -EBUSY; | |
261 | goto fail1; | |
262 | } | |
263 | ||
264 | nuc900_rtc->rtc_reg = ioremap(res->start, resource_size(res)); | |
265 | if (!nuc900_rtc->rtc_reg) { | |
266 | dev_err(&pdev->dev, "ioremap rtc_reg failed\n"); | |
267 | err = -ENOMEM; | |
268 | goto fail2; | |
269 | } | |
270 | ||
271 | nuc900_rtc->irq_num = platform_get_irq(pdev, 0); | |
272 | if (request_irq(nuc900_rtc->irq_num, nuc900_rtc_interrupt, | |
273 | IRQF_DISABLED, "nuc900rtc", nuc900_rtc)) { | |
274 | dev_err(&pdev->dev, "NUC900 RTC request irq failed\n"); | |
275 | err = -EBUSY; | |
276 | goto fail3; | |
277 | } | |
278 | ||
279 | nuc900_rtc->rtcdev = rtc_device_register(pdev->name, &pdev->dev, | |
280 | &nuc900_rtc_ops, THIS_MODULE); | |
281 | if (IS_ERR(nuc900_rtc->rtcdev)) { | |
282 | dev_err(&pdev->dev, "rtc device register faild\n"); | |
283 | err = PTR_ERR(nuc900_rtc->rtcdev); | |
284 | goto fail4; | |
285 | } | |
286 | ||
287 | platform_set_drvdata(pdev, nuc900_rtc); | |
288 | __raw_writel(__raw_readl(nuc900_rtc->rtc_reg + REG_RTC_TSSR) | MODE24, | |
289 | nuc900_rtc->rtc_reg + REG_RTC_TSSR); | |
290 | ||
291 | return 0; | |
292 | ||
293 | fail4: free_irq(nuc900_rtc->irq_num, nuc900_rtc); | |
294 | fail3: iounmap(nuc900_rtc->rtc_reg); | |
295 | fail2: release_mem_region(res->start, resource_size(res)); | |
296 | fail1: kfree(nuc900_rtc); | |
297 | return err; | |
298 | } | |
299 | ||
300 | static int __devexit nuc900_rtc_remove(struct platform_device *pdev) | |
301 | { | |
302 | struct nuc900_rtc *nuc900_rtc = platform_get_drvdata(pdev); | |
303 | struct resource *res; | |
304 | ||
305 | rtc_device_unregister(nuc900_rtc->rtcdev); | |
306 | free_irq(nuc900_rtc->irq_num, nuc900_rtc); | |
307 | iounmap(nuc900_rtc->rtc_reg); | |
308 | ||
309 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
310 | release_mem_region(res->start, resource_size(res)); | |
311 | ||
312 | kfree(nuc900_rtc); | |
313 | ||
314 | platform_set_drvdata(pdev, NULL); | |
315 | ||
316 | return 0; | |
317 | } | |
318 | ||
319 | static struct platform_driver nuc900_rtc_driver = { | |
320 | .remove = __devexit_p(nuc900_rtc_remove), | |
321 | .driver = { | |
322 | .name = "nuc900-rtc", | |
323 | .owner = THIS_MODULE, | |
324 | }, | |
325 | }; | |
326 | ||
327 | static int __init nuc900_rtc_init(void) | |
328 | { | |
329 | return platform_driver_probe(&nuc900_rtc_driver, nuc900_rtc_probe); | |
330 | } | |
331 | ||
332 | static void __exit nuc900_rtc_exit(void) | |
333 | { | |
334 | platform_driver_unregister(&nuc900_rtc_driver); | |
335 | } | |
336 | ||
337 | module_init(nuc900_rtc_init); | |
338 | module_exit(nuc900_rtc_exit); | |
339 | ||
340 | MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>"); | |
341 | MODULE_DESCRIPTION("nuc910/nuc920 RTC driver"); | |
342 | MODULE_LICENSE("GPL"); | |
343 | MODULE_ALIAS("platform:nuc900-rtc"); |