This source file includes following definitions.
- sa1100_rtc_interrupt
- sa1100_rtc_alarm_irq_enable
- sa1100_rtc_read_time
- sa1100_rtc_set_time
- sa1100_rtc_read_alarm
- sa1100_rtc_set_alarm
- sa1100_rtc_proc
- sa1100_rtc_init
- sa1100_rtc_probe
- sa1100_rtc_remove
- sa1100_rtc_suspend
- sa1100_rtc_resume
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20 #include <linux/platform_device.h>
21 #include <linux/module.h>
22 #include <linux/clk.h>
23 #include <linux/rtc.h>
24 #include <linux/init.h>
25 #include <linux/fs.h>
26 #include <linux/interrupt.h>
27 #include <linux/slab.h>
28 #include <linux/string.h>
29 #include <linux/of.h>
30 #include <linux/pm.h>
31 #include <linux/bitops.h>
32 #include <linux/io.h>
33
34 #define RTSR_HZE BIT(3)
35 #define RTSR_ALE BIT(2)
36 #define RTSR_HZ BIT(1)
37 #define RTSR_AL BIT(0)
38
39 #include "rtc-sa1100.h"
40
41 #define RTC_DEF_DIVIDER (32768 - 1)
42 #define RTC_DEF_TRIM 0
43 #define RTC_FREQ 1024
44
45
46 static irqreturn_t sa1100_rtc_interrupt(int irq, void *dev_id)
47 {
48 struct sa1100_rtc *info = dev_get_drvdata(dev_id);
49 struct rtc_device *rtc = info->rtc;
50 unsigned int rtsr;
51 unsigned long events = 0;
52
53 spin_lock(&info->lock);
54
55 rtsr = readl_relaxed(info->rtsr);
56
57 writel_relaxed(0, info->rtsr);
58
59
60 if (rtsr & (RTSR_ALE | RTSR_HZE)) {
61
62
63
64 writel_relaxed((RTSR_AL | RTSR_HZ) & (rtsr >> 2), info->rtsr);
65 } else {
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73 writel_relaxed(RTSR_AL | RTSR_HZ, info->rtsr);
74 }
75
76
77 if (rtsr & RTSR_AL)
78 rtsr &= ~RTSR_ALE;
79 writel_relaxed(rtsr & (RTSR_ALE | RTSR_HZE), info->rtsr);
80
81
82 if (rtsr & RTSR_AL)
83 events |= RTC_AF | RTC_IRQF;
84 if (rtsr & RTSR_HZ)
85 events |= RTC_UF | RTC_IRQF;
86
87 rtc_update_irq(rtc, 1, events);
88
89 spin_unlock(&info->lock);
90
91 return IRQ_HANDLED;
92 }
93
94 static int sa1100_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
95 {
96 u32 rtsr;
97 struct sa1100_rtc *info = dev_get_drvdata(dev);
98
99 spin_lock_irq(&info->lock);
100 rtsr = readl_relaxed(info->rtsr);
101 if (enabled)
102 rtsr |= RTSR_ALE;
103 else
104 rtsr &= ~RTSR_ALE;
105 writel_relaxed(rtsr, info->rtsr);
106 spin_unlock_irq(&info->lock);
107 return 0;
108 }
109
110 static int sa1100_rtc_read_time(struct device *dev, struct rtc_time *tm)
111 {
112 struct sa1100_rtc *info = dev_get_drvdata(dev);
113
114 rtc_time_to_tm(readl_relaxed(info->rcnr), tm);
115 return 0;
116 }
117
118 static int sa1100_rtc_set_time(struct device *dev, struct rtc_time *tm)
119 {
120 struct sa1100_rtc *info = dev_get_drvdata(dev);
121 unsigned long time;
122 int ret;
123
124 ret = rtc_tm_to_time(tm, &time);
125 if (ret == 0)
126 writel_relaxed(time, info->rcnr);
127 return ret;
128 }
129
130 static int sa1100_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
131 {
132 u32 rtsr;
133 struct sa1100_rtc *info = dev_get_drvdata(dev);
134
135 rtsr = readl_relaxed(info->rtsr);
136 alrm->enabled = (rtsr & RTSR_ALE) ? 1 : 0;
137 alrm->pending = (rtsr & RTSR_AL) ? 1 : 0;
138 return 0;
139 }
140
141 static int sa1100_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
142 {
143 struct sa1100_rtc *info = dev_get_drvdata(dev);
144 unsigned long time;
145 int ret;
146
147 spin_lock_irq(&info->lock);
148 ret = rtc_tm_to_time(&alrm->time, &time);
149 if (ret != 0)
150 goto out;
151 writel_relaxed(readl_relaxed(info->rtsr) &
152 (RTSR_HZE | RTSR_ALE | RTSR_AL), info->rtsr);
153 writel_relaxed(time, info->rtar);
154 if (alrm->enabled)
155 writel_relaxed(readl_relaxed(info->rtsr) | RTSR_ALE, info->rtsr);
156 else
157 writel_relaxed(readl_relaxed(info->rtsr) & ~RTSR_ALE, info->rtsr);
158 out:
159 spin_unlock_irq(&info->lock);
160
161 return ret;
162 }
163
164 static int sa1100_rtc_proc(struct device *dev, struct seq_file *seq)
165 {
166 struct sa1100_rtc *info = dev_get_drvdata(dev);
167
168 seq_printf(seq, "trim/divider\t\t: 0x%08x\n", readl_relaxed(info->rttr));
169 seq_printf(seq, "RTSR\t\t\t: 0x%08x\n", readl_relaxed(info->rtsr));
170
171 return 0;
172 }
173
174 static const struct rtc_class_ops sa1100_rtc_ops = {
175 .read_time = sa1100_rtc_read_time,
176 .set_time = sa1100_rtc_set_time,
177 .read_alarm = sa1100_rtc_read_alarm,
178 .set_alarm = sa1100_rtc_set_alarm,
179 .proc = sa1100_rtc_proc,
180 .alarm_irq_enable = sa1100_rtc_alarm_irq_enable,
181 };
182
183 int sa1100_rtc_init(struct platform_device *pdev, struct sa1100_rtc *info)
184 {
185 struct rtc_device *rtc;
186 int ret;
187
188 spin_lock_init(&info->lock);
189
190 info->clk = devm_clk_get(&pdev->dev, NULL);
191 if (IS_ERR(info->clk)) {
192 dev_err(&pdev->dev, "failed to find rtc clock source\n");
193 return PTR_ERR(info->clk);
194 }
195
196 ret = clk_prepare_enable(info->clk);
197 if (ret)
198 return ret;
199
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205
206 if (readl_relaxed(info->rttr) == 0) {
207 writel_relaxed(RTC_DEF_DIVIDER + (RTC_DEF_TRIM << 16), info->rttr);
208 dev_warn(&pdev->dev, "warning: "
209 "initializing default clock divider/trim value\n");
210
211 writel_relaxed(0, info->rcnr);
212 }
213
214 rtc = devm_rtc_device_register(&pdev->dev, pdev->name, &sa1100_rtc_ops,
215 THIS_MODULE);
216 if (IS_ERR(rtc)) {
217 clk_disable_unprepare(info->clk);
218 return PTR_ERR(rtc);
219 }
220 info->rtc = rtc;
221
222 rtc->max_user_freq = RTC_FREQ;
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246 writel_relaxed(RTSR_AL | RTSR_HZ, info->rtsr);
247
248 return 0;
249 }
250 EXPORT_SYMBOL_GPL(sa1100_rtc_init);
251
252 static int sa1100_rtc_probe(struct platform_device *pdev)
253 {
254 struct sa1100_rtc *info;
255 struct resource *iores;
256 void __iomem *base;
257 int irq_1hz, irq_alarm;
258 int ret;
259
260 irq_1hz = platform_get_irq_byname(pdev, "rtc 1Hz");
261 irq_alarm = platform_get_irq_byname(pdev, "rtc alarm");
262 if (irq_1hz < 0 || irq_alarm < 0)
263 return -ENODEV;
264
265 info = devm_kzalloc(&pdev->dev, sizeof(struct sa1100_rtc), GFP_KERNEL);
266 if (!info)
267 return -ENOMEM;
268 info->irq_1hz = irq_1hz;
269 info->irq_alarm = irq_alarm;
270
271 ret = devm_request_irq(&pdev->dev, irq_1hz, sa1100_rtc_interrupt, 0,
272 "rtc 1Hz", &pdev->dev);
273 if (ret) {
274 dev_err(&pdev->dev, "IRQ %d already in use.\n", irq_1hz);
275 return ret;
276 }
277 ret = devm_request_irq(&pdev->dev, irq_alarm, sa1100_rtc_interrupt, 0,
278 "rtc Alrm", &pdev->dev);
279 if (ret) {
280 dev_err(&pdev->dev, "IRQ %d already in use.\n", irq_alarm);
281 return ret;
282 }
283
284 iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
285 base = devm_ioremap_resource(&pdev->dev, iores);
286 if (IS_ERR(base))
287 return PTR_ERR(base);
288
289 if (IS_ENABLED(CONFIG_ARCH_SA1100) ||
290 of_device_is_compatible(pdev->dev.of_node, "mrvl,sa1100-rtc")) {
291 info->rcnr = base + 0x04;
292 info->rtsr = base + 0x10;
293 info->rtar = base + 0x00;
294 info->rttr = base + 0x08;
295 } else {
296 info->rcnr = base + 0x0;
297 info->rtsr = base + 0x8;
298 info->rtar = base + 0x4;
299 info->rttr = base + 0xc;
300 }
301
302 platform_set_drvdata(pdev, info);
303 device_init_wakeup(&pdev->dev, 1);
304
305 return sa1100_rtc_init(pdev, info);
306 }
307
308 static int sa1100_rtc_remove(struct platform_device *pdev)
309 {
310 struct sa1100_rtc *info = platform_get_drvdata(pdev);
311
312 if (info) {
313 spin_lock_irq(&info->lock);
314 writel_relaxed(0, info->rtsr);
315 spin_unlock_irq(&info->lock);
316 clk_disable_unprepare(info->clk);
317 }
318
319 return 0;
320 }
321
322 #ifdef CONFIG_PM_SLEEP
323 static int sa1100_rtc_suspend(struct device *dev)
324 {
325 struct sa1100_rtc *info = dev_get_drvdata(dev);
326 if (device_may_wakeup(dev))
327 enable_irq_wake(info->irq_alarm);
328 return 0;
329 }
330
331 static int sa1100_rtc_resume(struct device *dev)
332 {
333 struct sa1100_rtc *info = dev_get_drvdata(dev);
334 if (device_may_wakeup(dev))
335 disable_irq_wake(info->irq_alarm);
336 return 0;
337 }
338 #endif
339
340 static SIMPLE_DEV_PM_OPS(sa1100_rtc_pm_ops, sa1100_rtc_suspend,
341 sa1100_rtc_resume);
342
343 #ifdef CONFIG_OF
344 static const struct of_device_id sa1100_rtc_dt_ids[] = {
345 { .compatible = "mrvl,sa1100-rtc", },
346 { .compatible = "mrvl,mmp-rtc", },
347 {}
348 };
349 MODULE_DEVICE_TABLE(of, sa1100_rtc_dt_ids);
350 #endif
351
352 static struct platform_driver sa1100_rtc_driver = {
353 .probe = sa1100_rtc_probe,
354 .remove = sa1100_rtc_remove,
355 .driver = {
356 .name = "sa1100-rtc",
357 .pm = &sa1100_rtc_pm_ops,
358 .of_match_table = of_match_ptr(sa1100_rtc_dt_ids),
359 },
360 };
361
362 module_platform_driver(sa1100_rtc_driver);
363
364 MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
365 MODULE_DESCRIPTION("SA11x0/PXA2xx Realtime Clock Driver (RTC)");
366 MODULE_LICENSE("GPL");
367 MODULE_ALIAS("platform:sa1100-rtc");