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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
29static struct resource *puv3_rtc_mem;
30
31static int puv3_rtc_alarmno = IRQ_RTCAlarm;
32static int puv3_rtc_tickno = IRQ_RTC;
33
34static DEFINE_SPINLOCK(puv3_rtc_pie_lock);
35
36
37static 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
46static 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
56static 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
70static 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
89static 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
100static 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
114static 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
130static 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
153static 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
160static 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
189static 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
195 puv3_rtc_setpie(dev, 0);
196 free_irq(puv3_rtc_alarmno, rtc_dev);
197 free_irq(puv3_rtc_tickno, rtc_dev);
198}
199
200static 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
210static 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
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
223static 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
238static 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
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
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
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
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
306static int ticnt_save;
307
308static int puv3_rtc_suspend(struct device *dev)
309{
310
311 ticnt_save = readl(RTC_RTAR);
312 puv3_rtc_enable(dev, 0);
313 return 0;
314}
315
316static 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
324static SIMPLE_DEV_PM_OPS(puv3_rtc_pm_ops, puv3_rtc_suspend, puv3_rtc_resume);
325
326static struct platform_driver puv3_rtc_driver = {
327 .probe = puv3_rtc_probe,
328 .remove = puv3_rtc_remove,
329 .driver = {
330 .name = "PKUnity-v3-RTC",
331 .pm = &puv3_rtc_pm_ops,
332 }
333};
334
335module_platform_driver(puv3_rtc_driver);
336
337MODULE_DESCRIPTION("RTC Driver for the PKUnity v3 chip");
338MODULE_AUTHOR("Hu Dongliang");
339MODULE_LICENSE("GPL v2");
340
