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Commit | Line | Data |
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02b2ee16 | 1 | /* |
2809e80b | 2 | * RTC driver code specific to PKUnity SoC and UniCore ISA |
02b2ee16 G |
3 | * |
4 | * Maintained by GUAN Xue-tao <gxt@mprc.pku.edu.cn> | |
5 | * Copyright (C) 2001-2010 Guan Xuetao | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
12 | #include <linux/module.h> | |
13 | #include <linux/fs.h> | |
14 | #include <linux/string.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/platform_device.h> | |
17 | #include <linux/interrupt.h> | |
18 | #include <linux/rtc.h> | |
19 | #include <linux/bcd.h> | |
20 | #include <linux/clk.h> | |
21 | #include <linux/log2.h> | |
22 | #include <linux/slab.h> | |
23 | #include <linux/uaccess.h> | |
24 | #include <linux/io.h> | |
25 | ||
26 | #include <asm/irq.h> | |
27 | #include <mach/hardware.h> | |
28 | ||
29 | static struct resource *puv3_rtc_mem; | |
30 | ||
31 | static int puv3_rtc_alarmno = IRQ_RTCAlarm; | |
32 | static int puv3_rtc_tickno = IRQ_RTC; | |
33 | ||
34 | static DEFINE_SPINLOCK(puv3_rtc_pie_lock); | |
35 | ||
36 | /* IRQ Handlers */ | |
02b2ee16 G |
37 | static irqreturn_t puv3_rtc_alarmirq(int irq, void *id) |
38 | { | |
39 | struct rtc_device *rdev = id; | |
40 | ||
e5abf78b | 41 | writel(readl(RTC_RTSR) | RTC_RTSR_AL, RTC_RTSR); |
02b2ee16 G |
42 | rtc_update_irq(rdev, 1, RTC_AF | RTC_IRQF); |
43 | return IRQ_HANDLED; | |
44 | } | |
45 | ||
46 | static irqreturn_t puv3_rtc_tickirq(int irq, void *id) | |
47 | { | |
48 | struct rtc_device *rdev = id; | |
49 | ||
e5abf78b | 50 | writel(readl(RTC_RTSR) | RTC_RTSR_HZ, RTC_RTSR); |
02b2ee16 G |
51 | rtc_update_irq(rdev, 1, RTC_PF | RTC_IRQF); |
52 | return IRQ_HANDLED; | |
53 | } | |
54 | ||
55 | /* Update control registers */ | |
56 | static void puv3_rtc_setaie(int to) | |
57 | { | |
58 | unsigned int tmp; | |
59 | ||
60 | pr_debug("%s: aie=%d\n", __func__, to); | |
61 | ||
e5abf78b | 62 | tmp = readl(RTC_RTSR) & ~RTC_RTSR_ALE; |
02b2ee16 G |
63 | |
64 | if (to) | |
65 | tmp |= RTC_RTSR_ALE; | |
66 | ||
e5abf78b | 67 | writel(tmp, RTC_RTSR); |
02b2ee16 G |
68 | } |
69 | ||
70 | static int puv3_rtc_setpie(struct device *dev, int enabled) | |
71 | { | |
72 | unsigned int tmp; | |
73 | ||
74 | pr_debug("%s: pie=%d\n", __func__, enabled); | |
75 | ||
76 | spin_lock_irq(&puv3_rtc_pie_lock); | |
e5abf78b | 77 | tmp = readl(RTC_RTSR) & ~RTC_RTSR_HZE; |
02b2ee16 G |
78 | |
79 | if (enabled) | |
80 | tmp |= RTC_RTSR_HZE; | |
81 | ||
e5abf78b | 82 | writel(tmp, RTC_RTSR); |
02b2ee16 G |
83 | spin_unlock_irq(&puv3_rtc_pie_lock); |
84 | ||
85 | return 0; | |
86 | } | |
87 | ||
02b2ee16 | 88 | /* Time read/write */ |
02b2ee16 G |
89 | static int puv3_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm) |
90 | { | |
e5abf78b | 91 | rtc_time_to_tm(readl(RTC_RCNR), rtc_tm); |
02b2ee16 G |
92 | |
93 | pr_debug("read time %02x.%02x.%02x %02x/%02x/%02x\n", | |
94 | rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday, | |
95 | rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec); | |
96 | ||
97 | return 0; | |
98 | } | |
99 | ||
100 | static int puv3_rtc_settime(struct device *dev, struct rtc_time *tm) | |
101 | { | |
102 | unsigned long rtc_count = 0; | |
103 | ||
104 | pr_debug("set time %02d.%02d.%02d %02d/%02d/%02d\n", | |
105 | tm->tm_year, tm->tm_mon, tm->tm_mday, | |
106 | tm->tm_hour, tm->tm_min, tm->tm_sec); | |
107 | ||
108 | rtc_tm_to_time(tm, &rtc_count); | |
e5abf78b | 109 | writel(rtc_count, RTC_RCNR); |
02b2ee16 G |
110 | |
111 | return 0; | |
112 | } | |
113 | ||
114 | static int puv3_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm) | |
115 | { | |
116 | struct rtc_time *alm_tm = &alrm->time; | |
117 | ||
e5abf78b | 118 | rtc_time_to_tm(readl(RTC_RTAR), alm_tm); |
02b2ee16 | 119 | |
e5abf78b | 120 | alrm->enabled = readl(RTC_RTSR) & RTC_RTSR_ALE; |
02b2ee16 G |
121 | |
122 | pr_debug("read alarm %02x %02x.%02x.%02x %02x/%02x/%02x\n", | |
123 | alrm->enabled, | |
124 | alm_tm->tm_year, alm_tm->tm_mon, alm_tm->tm_mday, | |
125 | alm_tm->tm_hour, alm_tm->tm_min, alm_tm->tm_sec); | |
126 | ||
127 | return 0; | |
128 | } | |
129 | ||
130 | static int puv3_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm) | |
131 | { | |
132 | struct rtc_time *tm = &alrm->time; | |
133 | unsigned long rtcalarm_count = 0; | |
134 | ||
135 | pr_debug("puv3_rtc_setalarm: %d, %02x/%02x/%02x %02x.%02x.%02x\n", | |
136 | alrm->enabled, | |
137 | tm->tm_mday & 0xff, tm->tm_mon & 0xff, tm->tm_year & 0xff, | |
138 | tm->tm_hour & 0xff, tm->tm_min & 0xff, tm->tm_sec); | |
139 | ||
140 | rtc_tm_to_time(tm, &rtcalarm_count); | |
e5abf78b | 141 | writel(rtcalarm_count, RTC_RTAR); |
02b2ee16 G |
142 | |
143 | puv3_rtc_setaie(alrm->enabled); | |
144 | ||
145 | if (alrm->enabled) | |
146 | enable_irq_wake(puv3_rtc_alarmno); | |
147 | else | |
148 | disable_irq_wake(puv3_rtc_alarmno); | |
149 | ||
150 | return 0; | |
151 | } | |
152 | ||
153 | static int puv3_rtc_proc(struct device *dev, struct seq_file *seq) | |
154 | { | |
155 | seq_printf(seq, "periodic_IRQ\t: %s\n", | |
e5abf78b | 156 | (readl(RTC_RTSR) & RTC_RTSR_HZE) ? "yes" : "no"); |
02b2ee16 G |
157 | return 0; |
158 | } | |
159 | ||
160 | static int puv3_rtc_open(struct device *dev) | |
161 | { | |
162 | struct platform_device *pdev = to_platform_device(dev); | |
163 | struct rtc_device *rtc_dev = platform_get_drvdata(pdev); | |
164 | int ret; | |
165 | ||
166 | ret = request_irq(puv3_rtc_alarmno, puv3_rtc_alarmirq, | |
a9196b0b | 167 | 0, "pkunity-rtc alarm", rtc_dev); |
02b2ee16 G |
168 | |
169 | if (ret) { | |
170 | dev_err(dev, "IRQ%d error %d\n", puv3_rtc_alarmno, ret); | |
171 | return ret; | |
172 | } | |
173 | ||
174 | ret = request_irq(puv3_rtc_tickno, puv3_rtc_tickirq, | |
a9196b0b | 175 | 0, "pkunity-rtc tick", rtc_dev); |
02b2ee16 G |
176 | |
177 | if (ret) { | |
178 | dev_err(dev, "IRQ%d error %d\n", puv3_rtc_tickno, ret); | |
179 | goto tick_err; | |
180 | } | |
181 | ||
182 | return ret; | |
183 | ||
184 | tick_err: | |
185 | free_irq(puv3_rtc_alarmno, rtc_dev); | |
186 | return ret; | |
187 | } | |
188 | ||
189 | static void puv3_rtc_release(struct device *dev) | |
190 | { | |
191 | struct platform_device *pdev = to_platform_device(dev); | |
192 | struct rtc_device *rtc_dev = platform_get_drvdata(pdev); | |
193 | ||
194 | /* do not clear AIE here, it may be needed for wake */ | |
02b2ee16 G |
195 | puv3_rtc_setpie(dev, 0); |
196 | free_irq(puv3_rtc_alarmno, rtc_dev); | |
197 | free_irq(puv3_rtc_tickno, rtc_dev); | |
198 | } | |
199 | ||
200 | static const struct rtc_class_ops puv3_rtcops = { | |
201 | .open = puv3_rtc_open, | |
202 | .release = puv3_rtc_release, | |
203 | .read_time = puv3_rtc_gettime, | |
204 | .set_time = puv3_rtc_settime, | |
205 | .read_alarm = puv3_rtc_getalarm, | |
206 | .set_alarm = puv3_rtc_setalarm, | |
02b2ee16 G |
207 | .proc = puv3_rtc_proc, |
208 | }; | |
209 | ||
210 | static void puv3_rtc_enable(struct platform_device *pdev, int en) | |
211 | { | |
212 | if (!en) { | |
e5abf78b | 213 | writel(readl(RTC_RTSR) & ~RTC_RTSR_HZE, RTC_RTSR); |
02b2ee16 G |
214 | } else { |
215 | /* re-enable the device, and check it is ok */ | |
e5abf78b | 216 | if ((readl(RTC_RTSR) & RTC_RTSR_HZE) == 0) { |
02b2ee16 | 217 | dev_info(&pdev->dev, "rtc disabled, re-enabling\n"); |
e5abf78b | 218 | writel(readl(RTC_RTSR) | RTC_RTSR_HZE, RTC_RTSR); |
02b2ee16 G |
219 | } |
220 | } | |
221 | } | |
222 | ||
5a167f45 | 223 | static int puv3_rtc_remove(struct platform_device *dev) |
02b2ee16 G |
224 | { |
225 | struct rtc_device *rtc = platform_get_drvdata(dev); | |
226 | ||
227 | platform_set_drvdata(dev, NULL); | |
228 | rtc_device_unregister(rtc); | |
229 | ||
230 | puv3_rtc_setpie(&dev->dev, 0); | |
231 | puv3_rtc_setaie(0); | |
232 | ||
233 | release_resource(puv3_rtc_mem); | |
234 | kfree(puv3_rtc_mem); | |
235 | ||
236 | return 0; | |
237 | } | |
238 | ||
5a167f45 | 239 | static int puv3_rtc_probe(struct platform_device *pdev) |
02b2ee16 G |
240 | { |
241 | struct rtc_device *rtc; | |
242 | struct resource *res; | |
243 | int ret; | |
244 | ||
245 | pr_debug("%s: probe=%p\n", __func__, pdev); | |
246 | ||
247 | /* find the IRQs */ | |
02b2ee16 G |
248 | puv3_rtc_tickno = platform_get_irq(pdev, 1); |
249 | if (puv3_rtc_tickno < 0) { | |
250 | dev_err(&pdev->dev, "no irq for rtc tick\n"); | |
251 | return -ENOENT; | |
252 | } | |
253 | ||
254 | puv3_rtc_alarmno = platform_get_irq(pdev, 0); | |
255 | if (puv3_rtc_alarmno < 0) { | |
256 | dev_err(&pdev->dev, "no irq for alarm\n"); | |
257 | return -ENOENT; | |
258 | } | |
259 | ||
260 | pr_debug("PKUnity_rtc: tick irq %d, alarm irq %d\n", | |
261 | puv3_rtc_tickno, puv3_rtc_alarmno); | |
262 | ||
263 | /* get the memory region */ | |
02b2ee16 G |
264 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
265 | if (res == NULL) { | |
266 | dev_err(&pdev->dev, "failed to get memory region resource\n"); | |
267 | return -ENOENT; | |
268 | } | |
269 | ||
28f65c11 JP |
270 | puv3_rtc_mem = request_mem_region(res->start, resource_size(res), |
271 | pdev->name); | |
02b2ee16 G |
272 | |
273 | if (puv3_rtc_mem == NULL) { | |
274 | dev_err(&pdev->dev, "failed to reserve memory region\n"); | |
275 | ret = -ENOENT; | |
276 | goto err_nores; | |
277 | } | |
278 | ||
279 | puv3_rtc_enable(pdev, 1); | |
280 | ||
02b2ee16 | 281 | /* register RTC and exit */ |
02b2ee16 G |
282 | rtc = rtc_device_register("pkunity", &pdev->dev, &puv3_rtcops, |
283 | THIS_MODULE); | |
284 | ||
285 | if (IS_ERR(rtc)) { | |
286 | dev_err(&pdev->dev, "cannot attach rtc\n"); | |
287 | ret = PTR_ERR(rtc); | |
288 | goto err_nortc; | |
289 | } | |
290 | ||
291 | /* platform setup code should have handled this; sigh */ | |
292 | if (!device_can_wakeup(&pdev->dev)) | |
293 | device_init_wakeup(&pdev->dev, 1); | |
294 | ||
295 | platform_set_drvdata(pdev, rtc); | |
296 | return 0; | |
297 | ||
298 | err_nortc: | |
299 | puv3_rtc_enable(pdev, 0); | |
300 | release_resource(puv3_rtc_mem); | |
301 | ||
302 | err_nores: | |
303 | return ret; | |
304 | } | |
305 | ||
306 | #ifdef CONFIG_PM | |
307 | ||
02b2ee16 G |
308 | static int ticnt_save; |
309 | ||
310 | static int puv3_rtc_suspend(struct platform_device *pdev, pm_message_t state) | |
311 | { | |
312 | /* save RTAR for anyone using periodic interrupts */ | |
e5abf78b | 313 | ticnt_save = readl(RTC_RTAR); |
02b2ee16 G |
314 | puv3_rtc_enable(pdev, 0); |
315 | return 0; | |
316 | } | |
317 | ||
318 | static int puv3_rtc_resume(struct platform_device *pdev) | |
319 | { | |
320 | puv3_rtc_enable(pdev, 1); | |
e5abf78b | 321 | writel(ticnt_save, RTC_RTAR); |
02b2ee16 G |
322 | return 0; |
323 | } | |
324 | #else | |
325 | #define puv3_rtc_suspend NULL | |
326 | #define puv3_rtc_resume NULL | |
327 | #endif | |
328 | ||
b3a0aa3a | 329 | static struct platform_driver puv3_rtc_driver = { |
02b2ee16 | 330 | .probe = puv3_rtc_probe, |
5a167f45 | 331 | .remove = puv3_rtc_remove, |
02b2ee16 G |
332 | .suspend = puv3_rtc_suspend, |
333 | .resume = puv3_rtc_resume, | |
334 | .driver = { | |
335 | .name = "PKUnity-v3-RTC", | |
336 | .owner = THIS_MODULE, | |
337 | } | |
338 | }; | |
339 | ||
b3a0aa3a | 340 | module_platform_driver(puv3_rtc_driver); |
02b2ee16 G |
341 | |
342 | MODULE_DESCRIPTION("RTC Driver for the PKUnity v3 chip"); | |
343 | MODULE_AUTHOR("Hu Dongliang"); | |
344 | MODULE_LICENSE("GPL v2"); |