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Linux/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(struct device *dev, int to)
 57 {
 58         unsigned int tmp;
 59 
 60         dev_dbg(dev, "%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         dev_dbg(dev, "%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         dev_dbg(dev, "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         dev_dbg(dev, "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         dev_dbg(dev, "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         dev_dbg(dev, "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(dev, 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                         0, "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                         0, "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 device *dev, 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(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         rtc_device_unregister(rtc);
228 
229         puv3_rtc_setpie(&dev->dev, 0);
230         puv3_rtc_setaie(&dev->dev, 0);
231 
232         release_resource(puv3_rtc_mem);
233         kfree(puv3_rtc_mem);
234 
235         return 0;
236 }
237 
238 static int puv3_rtc_probe(struct platform_device *pdev)
239 {
240         struct rtc_device *rtc;
241         struct resource *res;
242         int ret;
243 
244         dev_dbg(&pdev->dev, "%s: probe=%p\n", __func__, pdev);
245 
246         /* find the IRQs */
247         puv3_rtc_tickno = platform_get_irq(pdev, 1);
248         if (puv3_rtc_tickno < 0) {
249                 dev_err(&pdev->dev, "no irq for rtc tick\n");
250                 return -ENOENT;
251         }
252 
253         puv3_rtc_alarmno = platform_get_irq(pdev, 0);
254         if (puv3_rtc_alarmno < 0) {
255                 dev_err(&pdev->dev, "no irq for alarm\n");
256                 return -ENOENT;
257         }
258 
259         dev_dbg(&pdev->dev, "PKUnity_rtc: tick irq %d, alarm irq %d\n",
260                  puv3_rtc_tickno, puv3_rtc_alarmno);
261 
262         /* get the memory region */
263         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
264         if (res == NULL) {
265                 dev_err(&pdev->dev, "failed to get memory region resource\n");
266                 return -ENOENT;
267         }
268 
269         puv3_rtc_mem = request_mem_region(res->start, resource_size(res),
270                                           pdev->name);
271 
272         if (puv3_rtc_mem == NULL) {
273                 dev_err(&pdev->dev, "failed to reserve memory region\n");
274                 ret = -ENOENT;
275                 goto err_nores;
276         }
277 
278         puv3_rtc_enable(&pdev->dev, 1);
279 
280         /* register RTC and exit */
281         rtc = rtc_device_register("pkunity", &pdev->dev, &puv3_rtcops,
282                                   THIS_MODULE);
283 
284         if (IS_ERR(rtc)) {
285                 dev_err(&pdev->dev, "cannot attach rtc\n");
286                 ret = PTR_ERR(rtc);
287                 goto err_nortc;
288         }
289 
290         /* platform setup code should have handled this; sigh */
291         if (!device_can_wakeup(&pdev->dev))
292                 device_init_wakeup(&pdev->dev, 1);
293 
294         platform_set_drvdata(pdev, rtc);
295         return 0;
296 
297  err_nortc:
298         puv3_rtc_enable(&pdev->dev, 0);
299         release_resource(puv3_rtc_mem);
300 
301  err_nores:
302         return ret;
303 }
304 
305 #ifdef CONFIG_PM_SLEEP
306 static int ticnt_save;
307 
308 static int puv3_rtc_suspend(struct device *dev)
309 {
310         /* save RTAR for anyone using periodic interrupts */
311         ticnt_save = readl(RTC_RTAR);
312         puv3_rtc_enable(dev, 0);
313         return 0;
314 }
315 
316 static int puv3_rtc_resume(struct device *dev)
317 {
318         puv3_rtc_enable(dev, 1);
319         writel(ticnt_save, RTC_RTAR);
320         return 0;
321 }
322 #endif
323 
324 static SIMPLE_DEV_PM_OPS(puv3_rtc_pm_ops, puv3_rtc_suspend, puv3_rtc_resume);
325 
326 static struct platform_driver puv3_rtc_driver = {
327         .probe          = puv3_rtc_probe,
328         .remove         = puv3_rtc_remove,
329         .driver         = {
330                 .name   = "PKUnity-v3-RTC",
331                 .owner  = THIS_MODULE,
332                 .pm     = &puv3_rtc_pm_ops,
333         }
334 };
335 
336 module_platform_driver(puv3_rtc_driver);
337 
338 MODULE_DESCRIPTION("RTC Driver for the PKUnity v3 chip");
339 MODULE_AUTHOR("Hu Dongliang");
340 MODULE_LICENSE("GPL v2");
341 

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