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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 | { | |
2f11e57d | 88 | unsigned int 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 | ||
84f20a69 | 105 | static int nuc900_rtc_bcd2bin(unsigned int timereg, |
afd49a7e WZ |
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 | ||
84f20a69 | 116 | return rtc_valid_tm(tm); |
afd49a7e WZ |
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 | ||
84f20a69 | 173 | return nuc900_rtc_bcd2bin(timeval, clrval, tm); |
afd49a7e WZ |
174 | } |
175 | ||
176 | static int nuc900_rtc_set_time(struct device *dev, struct rtc_time *tm) | |
177 | { | |
178 | struct nuc900_rtc *rtc = dev_get_drvdata(dev); | |
179 | struct nuc900_bcd_time gettm; | |
180 | unsigned long val; | |
181 | int *err; | |
182 | ||
70d2a0ba | 183 | nuc900_rtc_bin2bcd(dev, tm, &gettm); |
afd49a7e WZ |
184 | |
185 | err = check_rtc_access_enable(rtc); | |
186 | if (IS_ERR(err)) | |
187 | return PTR_ERR(err); | |
188 | ||
189 | val = gettm.bcd_mday | gettm.bcd_mon | gettm.bcd_year; | |
190 | __raw_writel(val, rtc->rtc_reg + REG_RTC_CLR); | |
191 | ||
192 | val = gettm.bcd_sec | gettm.bcd_min | gettm.bcd_hour; | |
193 | __raw_writel(val, rtc->rtc_reg + REG_RTC_TLR); | |
194 | ||
195 | return 0; | |
196 | } | |
197 | ||
198 | static int nuc900_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
199 | { | |
200 | struct nuc900_rtc *rtc = dev_get_drvdata(dev); | |
201 | unsigned int timeval, carval; | |
202 | ||
203 | timeval = __raw_readl(rtc->rtc_reg + REG_RTC_TAR); | |
204 | carval = __raw_readl(rtc->rtc_reg + REG_RTC_CAR); | |
205 | ||
84f20a69 | 206 | return nuc900_rtc_bcd2bin(timeval, carval, &alrm->time); |
afd49a7e WZ |
207 | } |
208 | ||
209 | static int nuc900_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
210 | { | |
211 | struct nuc900_rtc *rtc = dev_get_drvdata(dev); | |
212 | struct nuc900_bcd_time tm; | |
213 | unsigned long val; | |
214 | int *err; | |
215 | ||
70d2a0ba | 216 | nuc900_rtc_bin2bcd(dev, &alrm->time, &tm); |
afd49a7e WZ |
217 | |
218 | err = check_rtc_access_enable(rtc); | |
219 | if (IS_ERR(err)) | |
220 | return PTR_ERR(err); | |
221 | ||
222 | val = tm.bcd_mday | tm.bcd_mon | tm.bcd_year; | |
223 | __raw_writel(val, rtc->rtc_reg + REG_RTC_CAR); | |
224 | ||
225 | val = tm.bcd_sec | tm.bcd_min | tm.bcd_hour; | |
226 | __raw_writel(val, rtc->rtc_reg + REG_RTC_TAR); | |
227 | ||
228 | return 0; | |
229 | } | |
230 | ||
231 | static struct rtc_class_ops nuc900_rtc_ops = { | |
232 | .read_time = nuc900_rtc_read_time, | |
233 | .set_time = nuc900_rtc_set_time, | |
234 | .read_alarm = nuc900_rtc_read_alarm, | |
235 | .set_alarm = nuc900_rtc_set_alarm, | |
236 | .alarm_irq_enable = nuc900_alarm_irq_enable, | |
237 | .update_irq_enable = nuc900_update_irq_enable, | |
238 | }; | |
239 | ||
240 | static int __devinit nuc900_rtc_probe(struct platform_device *pdev) | |
241 | { | |
242 | struct resource *res; | |
243 | struct nuc900_rtc *nuc900_rtc; | |
244 | int err = 0; | |
245 | ||
246 | nuc900_rtc = kzalloc(sizeof(struct nuc900_rtc), GFP_KERNEL); | |
247 | if (!nuc900_rtc) { | |
248 | dev_err(&pdev->dev, "kzalloc nuc900_rtc failed\n"); | |
249 | return -ENOMEM; | |
250 | } | |
251 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
252 | if (!res) { | |
253 | dev_err(&pdev->dev, "platform_get_resource failed\n"); | |
254 | err = -ENXIO; | |
255 | goto fail1; | |
256 | } | |
257 | ||
258 | if (!request_mem_region(res->start, resource_size(res), | |
259 | pdev->name)) { | |
260 | dev_err(&pdev->dev, "request_mem_region failed\n"); | |
261 | err = -EBUSY; | |
262 | goto fail1; | |
263 | } | |
264 | ||
265 | nuc900_rtc->rtc_reg = ioremap(res->start, resource_size(res)); | |
266 | if (!nuc900_rtc->rtc_reg) { | |
267 | dev_err(&pdev->dev, "ioremap rtc_reg failed\n"); | |
268 | err = -ENOMEM; | |
269 | goto fail2; | |
270 | } | |
271 | ||
23e53be9 | 272 | platform_set_drvdata(pdev, nuc900_rtc); |
afd49a7e WZ |
273 | |
274 | nuc900_rtc->rtcdev = rtc_device_register(pdev->name, &pdev->dev, | |
275 | &nuc900_rtc_ops, THIS_MODULE); | |
276 | if (IS_ERR(nuc900_rtc->rtcdev)) { | |
426d3107 | 277 | dev_err(&pdev->dev, "rtc device register failed\n"); |
afd49a7e | 278 | err = PTR_ERR(nuc900_rtc->rtcdev); |
23e53be9 | 279 | goto fail3; |
afd49a7e WZ |
280 | } |
281 | ||
afd49a7e WZ |
282 | __raw_writel(__raw_readl(nuc900_rtc->rtc_reg + REG_RTC_TSSR) | MODE24, |
283 | nuc900_rtc->rtc_reg + REG_RTC_TSSR); | |
284 | ||
23e53be9 WZ |
285 | nuc900_rtc->irq_num = platform_get_irq(pdev, 0); |
286 | if (request_irq(nuc900_rtc->irq_num, nuc900_rtc_interrupt, | |
287 | IRQF_DISABLED, "nuc900rtc", nuc900_rtc)) { | |
288 | dev_err(&pdev->dev, "NUC900 RTC request irq failed\n"); | |
289 | err = -EBUSY; | |
290 | goto fail4; | |
291 | } | |
292 | ||
afd49a7e WZ |
293 | return 0; |
294 | ||
23e53be9 | 295 | fail4: rtc_device_unregister(nuc900_rtc->rtcdev); |
afd49a7e WZ |
296 | fail3: iounmap(nuc900_rtc->rtc_reg); |
297 | fail2: release_mem_region(res->start, resource_size(res)); | |
298 | fail1: kfree(nuc900_rtc); | |
299 | return err; | |
300 | } | |
301 | ||
302 | static int __devexit nuc900_rtc_remove(struct platform_device *pdev) | |
303 | { | |
304 | struct nuc900_rtc *nuc900_rtc = platform_get_drvdata(pdev); | |
305 | struct resource *res; | |
306 | ||
afd49a7e | 307 | free_irq(nuc900_rtc->irq_num, nuc900_rtc); |
23e53be9 | 308 | rtc_device_unregister(nuc900_rtc->rtcdev); |
afd49a7e WZ |
309 | iounmap(nuc900_rtc->rtc_reg); |
310 | ||
311 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
312 | release_mem_region(res->start, resource_size(res)); | |
313 | ||
314 | kfree(nuc900_rtc); | |
315 | ||
316 | platform_set_drvdata(pdev, NULL); | |
317 | ||
318 | return 0; | |
319 | } | |
320 | ||
321 | static struct platform_driver nuc900_rtc_driver = { | |
322 | .remove = __devexit_p(nuc900_rtc_remove), | |
323 | .driver = { | |
324 | .name = "nuc900-rtc", | |
325 | .owner = THIS_MODULE, | |
326 | }, | |
327 | }; | |
328 | ||
329 | static int __init nuc900_rtc_init(void) | |
330 | { | |
331 | return platform_driver_probe(&nuc900_rtc_driver, nuc900_rtc_probe); | |
332 | } | |
333 | ||
334 | static void __exit nuc900_rtc_exit(void) | |
335 | { | |
336 | platform_driver_unregister(&nuc900_rtc_driver); | |
337 | } | |
338 | ||
339 | module_init(nuc900_rtc_init); | |
340 | module_exit(nuc900_rtc_exit); | |
341 | ||
342 | MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>"); | |
343 | MODULE_DESCRIPTION("nuc910/nuc920 RTC driver"); | |
344 | MODULE_LICENSE("GPL"); | |
345 | MODULE_ALIAS("platform:nuc900-rtc"); |