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9#include <linux/module.h>
10#include <linux/fs.h>
11#include <linux/string.h>
12#include <linux/init.h>
13#include <linux/platform_device.h>
14#include <linux/interrupt.h>
15#include <linux/rtc.h>
16#include <linux/bcd.h>
17#include <linux/clk.h>
18#include <linux/log2.h>
19#include <linux/slab.h>
20#include <linux/uaccess.h>
21#include <linux/io.h>
22
23#include <asm/irq.h>
24#include <mach/hardware.h>
25
26static struct resource *puv3_rtc_mem;
27
28static int puv3_rtc_alarmno = IRQ_RTCAlarm;
29static int puv3_rtc_tickno = IRQ_RTC;
30
31static DEFINE_SPINLOCK(puv3_rtc_pie_lock);
32
33
34static irqreturn_t puv3_rtc_alarmirq(int irq, void *id)
35{
36 struct rtc_device *rdev = id;
37
38 writel(readl(RTC_RTSR) | RTC_RTSR_AL, RTC_RTSR);
39 rtc_update_irq(rdev, 1, RTC_AF | RTC_IRQF);
40 return IRQ_HANDLED;
41}
42
43static irqreturn_t puv3_rtc_tickirq(int irq, void *id)
44{
45 struct rtc_device *rdev = id;
46
47 writel(readl(RTC_RTSR) | RTC_RTSR_HZ, RTC_RTSR);
48 rtc_update_irq(rdev, 1, RTC_PF | RTC_IRQF);
49 return IRQ_HANDLED;
50}
51
52
53static void puv3_rtc_setaie(struct device *dev, int to)
54{
55 unsigned int tmp;
56
57 dev_dbg(dev, "%s: aie=%d\n", __func__, to);
58
59 tmp = readl(RTC_RTSR) & ~RTC_RTSR_ALE;
60
61 if (to)
62 tmp |= RTC_RTSR_ALE;
63
64 writel(tmp, RTC_RTSR);
65}
66
67static int puv3_rtc_setpie(struct device *dev, int enabled)
68{
69 unsigned int tmp;
70
71 dev_dbg(dev, "%s: pie=%d\n", __func__, enabled);
72
73 spin_lock_irq(&puv3_rtc_pie_lock);
74 tmp = readl(RTC_RTSR) & ~RTC_RTSR_HZE;
75
76 if (enabled)
77 tmp |= RTC_RTSR_HZE;
78
79 writel(tmp, RTC_RTSR);
80 spin_unlock_irq(&puv3_rtc_pie_lock);
81
82 return 0;
83}
84
85
86static int puv3_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
87{
88 rtc_time_to_tm(readl(RTC_RCNR), rtc_tm);
89
90 dev_dbg(dev, "read time %ptRr\n", rtc_tm);
91
92 return 0;
93}
94
95static int puv3_rtc_settime(struct device *dev, struct rtc_time *tm)
96{
97 unsigned long rtc_count = 0;
98
99 dev_dbg(dev, "set time %ptRr\n", tm);
100
101 rtc_tm_to_time(tm, &rtc_count);
102 writel(rtc_count, RTC_RCNR);
103
104 return 0;
105}
106
107static int puv3_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
108{
109 struct rtc_time *alm_tm = &alrm->time;
110
111 rtc_time_to_tm(readl(RTC_RTAR), alm_tm);
112
113 alrm->enabled = readl(RTC_RTSR) & RTC_RTSR_ALE;
114
115 dev_dbg(dev, "read alarm: %d, %ptRr\n", alrm->enabled, alm_tm);
116
117 return 0;
118}
119
120static int puv3_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
121{
122 struct rtc_time *tm = &alrm->time;
123 unsigned long rtcalarm_count = 0;
124
125 dev_dbg(dev, "set alarm: %d, %ptRr\n", alrm->enabled, tm);
126
127 rtc_tm_to_time(tm, &rtcalarm_count);
128 writel(rtcalarm_count, RTC_RTAR);
129
130 puv3_rtc_setaie(dev, alrm->enabled);
131
132 if (alrm->enabled)
133 enable_irq_wake(puv3_rtc_alarmno);
134 else
135 disable_irq_wake(puv3_rtc_alarmno);
136
137 return 0;
138}
139
140static int puv3_rtc_proc(struct device *dev, struct seq_file *seq)
141{
142 seq_printf(seq, "periodic_IRQ\t: %s\n",
143 (readl(RTC_RTSR) & RTC_RTSR_HZE) ? "yes" : "no");
144 return 0;
145}
146
147static const struct rtc_class_ops puv3_rtcops = {
148 .read_time = puv3_rtc_gettime,
149 .set_time = puv3_rtc_settime,
150 .read_alarm = puv3_rtc_getalarm,
151 .set_alarm = puv3_rtc_setalarm,
152 .proc = puv3_rtc_proc,
153};
154
155static void puv3_rtc_enable(struct device *dev, int en)
156{
157 if (!en) {
158 writel(readl(RTC_RTSR) & ~RTC_RTSR_HZE, RTC_RTSR);
159 } else {
160
161 if ((readl(RTC_RTSR) & RTC_RTSR_HZE) == 0) {
162 dev_info(dev, "rtc disabled, re-enabling\n");
163 writel(readl(RTC_RTSR) | RTC_RTSR_HZE, RTC_RTSR);
164 }
165 }
166}
167
168static int puv3_rtc_remove(struct platform_device *dev)
169{
170 puv3_rtc_setpie(&dev->dev, 0);
171 puv3_rtc_setaie(&dev->dev, 0);
172
173 release_resource(puv3_rtc_mem);
174 kfree(puv3_rtc_mem);
175
176 return 0;
177}
178
179static int puv3_rtc_probe(struct platform_device *pdev)
180{
181 struct rtc_device *rtc;
182 struct resource *res;
183 int ret;
184
185 dev_dbg(&pdev->dev, "%s: probe=%p\n", __func__, pdev);
186
187
188 puv3_rtc_tickno = platform_get_irq(pdev, 1);
189 if (puv3_rtc_tickno < 0) {
190 dev_err(&pdev->dev, "no irq for rtc tick\n");
191 return -ENOENT;
192 }
193
194 puv3_rtc_alarmno = platform_get_irq(pdev, 0);
195 if (puv3_rtc_alarmno < 0) {
196 dev_err(&pdev->dev, "no irq for alarm\n");
197 return -ENOENT;
198 }
199
200 dev_dbg(&pdev->dev, "PKUnity_rtc: tick irq %d, alarm irq %d\n",
201 puv3_rtc_tickno, puv3_rtc_alarmno);
202
203 rtc = devm_rtc_allocate_device(&pdev->dev);
204 if (IS_ERR(rtc))
205 return PTR_ERR(rtc);
206
207 ret = devm_request_irq(&pdev->dev, puv3_rtc_alarmno, puv3_rtc_alarmirq,
208 0, "pkunity-rtc alarm", rtc);
209 if (ret) {
210 dev_err(&pdev->dev, "IRQ%d error %d\n", puv3_rtc_alarmno, ret);
211 return ret;
212 }
213
214 ret = devm_request_irq(&pdev->dev, puv3_rtc_tickno, puv3_rtc_tickirq,
215 0, "pkunity-rtc tick", rtc);
216 if (ret) {
217 dev_err(&pdev->dev, "IRQ%d error %d\n", puv3_rtc_tickno, ret);
218 return ret;
219 }
220
221
222 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
223 if (res == NULL) {
224 dev_err(&pdev->dev, "failed to get memory region resource\n");
225 return -ENOENT;
226 }
227
228 puv3_rtc_mem = request_mem_region(res->start, resource_size(res),
229 pdev->name);
230
231 if (puv3_rtc_mem == NULL) {
232 dev_err(&pdev->dev, "failed to reserve memory region\n");
233 ret = -ENOENT;
234 goto err_nores;
235 }
236
237 puv3_rtc_enable(&pdev->dev, 1);
238
239
240 rtc->ops = &puv3_rtcops;
241 ret = rtc_register_device(rtc);
242 if (ret) {
243 dev_err(&pdev->dev, "cannot attach rtc\n");
244 goto err_nortc;
245 }
246
247
248 if (!device_can_wakeup(&pdev->dev))
249 device_init_wakeup(&pdev->dev, 1);
250
251 platform_set_drvdata(pdev, rtc);
252 return 0;
253
254 err_nortc:
255 puv3_rtc_enable(&pdev->dev, 0);
256 release_resource(puv3_rtc_mem);
257
258 err_nores:
259 return ret;
260}
261
262#ifdef CONFIG_PM_SLEEP
263static int ticnt_save;
264
265static int puv3_rtc_suspend(struct device *dev)
266{
267
268 ticnt_save = readl(RTC_RTAR);
269 puv3_rtc_enable(dev, 0);
270 return 0;
271}
272
273static int puv3_rtc_resume(struct device *dev)
274{
275 puv3_rtc_enable(dev, 1);
276 writel(ticnt_save, RTC_RTAR);
277 return 0;
278}
279#endif
280
281static SIMPLE_DEV_PM_OPS(puv3_rtc_pm_ops, puv3_rtc_suspend, puv3_rtc_resume);
282
283static struct platform_driver puv3_rtc_driver = {
284 .probe = puv3_rtc_probe,
285 .remove = puv3_rtc_remove,
286 .driver = {
287 .name = "PKUnity-v3-RTC",
288 .pm = &puv3_rtc_pm_ops,
289 }
290};
291
292module_platform_driver(puv3_rtc_driver);
293
294MODULE_DESCRIPTION("RTC Driver for the PKUnity v3 chip");
295MODULE_AUTHOR("Hu Dongliang");
296MODULE_LICENSE("GPL v2");
297
