ARM: tegra30: pm: flush L1 data before exit coherency on secondary CPU
[linux-2.6.git] / drivers / rtc / rtc-puv3.c
1 /*
2  * RTC driver code specific to PKUnity SoC and UniCore ISA
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 */
37 static irqreturn_t puv3_rtc_alarmirq(int irq, void *id)
38 {
39         struct rtc_device *rdev = id;
40
41         writel(readl(RTC_RTSR) | RTC_RTSR_AL, RTC_RTSR);
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
50         writel(readl(RTC_RTSR) | RTC_RTSR_HZ, RTC_RTSR);
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
62         tmp = readl(RTC_RTSR) & ~RTC_RTSR_ALE;
63
64         if (to)
65                 tmp |= RTC_RTSR_ALE;
66
67         writel(tmp, RTC_RTSR);
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);
77         tmp = readl(RTC_RTSR) & ~RTC_RTSR_HZE;
78
79         if (enabled)
80                 tmp |= RTC_RTSR_HZE;
81
82         writel(tmp, RTC_RTSR);
83         spin_unlock_irq(&puv3_rtc_pie_lock);
84
85         return 0;
86 }
87
88 /* Time read/write */
89 static int puv3_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
90 {
91         rtc_time_to_tm(readl(RTC_RCNR), rtc_tm);
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);
109         writel(rtc_count, RTC_RCNR);
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
118         rtc_time_to_tm(readl(RTC_RTAR), alm_tm);
119
120         alrm->enabled = readl(RTC_RTSR) & RTC_RTSR_ALE;
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);
141         writel(rtcalarm_count, RTC_RTAR);
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",
156                      (readl(RTC_RTSR) & RTC_RTSR_HZE) ? "yes" : "no");
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,
167                           IRQF_DISABLED,  "pkunity-rtc alarm", rtc_dev);
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,
175                           IRQF_DISABLED,  "pkunity-rtc tick", rtc_dev);
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 */
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,
207         .proc           = puv3_rtc_proc,
208 };
209
210 static void puv3_rtc_enable(struct platform_device *pdev, int en)
211 {
212         if (!en) {
213                 writel(readl(RTC_RTSR) & ~RTC_RTSR_HZE, RTC_RTSR);
214         } else {
215                 /* re-enable the device, and check it is ok */
216                 if ((readl(RTC_RTSR) & RTC_RTSR_HZE) == 0) {
217                         dev_info(&pdev->dev, "rtc disabled, re-enabling\n");
218                         writel(readl(RTC_RTSR) | RTC_RTSR_HZE, RTC_RTSR);
219                 }
220         }
221 }
222
223 static int puv3_rtc_remove(struct platform_device *dev)
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
239 static int puv3_rtc_probe(struct platform_device *pdev)
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 */
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 */
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
270         puv3_rtc_mem = request_mem_region(res->start, resource_size(res),
271                                           pdev->name);
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
281         /* register RTC and exit */
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
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 */
313         ticnt_save = readl(RTC_RTAR);
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);
321         writel(ticnt_save, RTC_RTAR);
322         return 0;
323 }
324 #else
325 #define puv3_rtc_suspend NULL
326 #define puv3_rtc_resume  NULL
327 #endif
328
329 static struct platform_driver puv3_rtcdrv = {
330         .probe          = puv3_rtc_probe,
331         .remove         = __devexit_p(puv3_rtc_remove),
332         .suspend        = puv3_rtc_suspend,
333         .resume         = puv3_rtc_resume,
334         .driver         = {
335                 .name   = "PKUnity-v3-RTC",
336                 .owner  = THIS_MODULE,
337         }
338 };
339
340 static char __initdata banner[] = "PKUnity-v3 RTC, (c) 2009 PKUnity Co.\n";
341
342 static int __init puv3_rtc_init(void)
343 {
344         printk(banner);
345         return platform_driver_register(&puv3_rtcdrv);
346 }
347
348 static void __exit puv3_rtc_exit(void)
349 {
350         platform_driver_unregister(&puv3_rtcdrv);
351 }
352
353 module_init(puv3_rtc_init);
354 module_exit(puv3_rtc_exit);
355
356 MODULE_DESCRIPTION("RTC Driver for the PKUnity v3 chip");
357 MODULE_AUTHOR("Hu Dongliang");
358 MODULE_LICENSE("GPL v2");