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15#include <linux/delay.h>
16#include <linux/io.h>
17#include <linux/module.h>
18#include <linux/of.h>
19#include <linux/platform_device.h>
20#include <linux/rtc.h>
21
22#define RTC_STATUS 0x0
23#define RTC_STATUS_ALARM1 BIT(0)
24#define RTC_STATUS_ALARM2 BIT(1)
25#define RTC_IRQ1_CONF 0x4
26#define RTC_IRQ1_AL_EN BIT(0)
27#define RTC_IRQ1_FREQ_EN BIT(1)
28#define RTC_IRQ1_FREQ_1HZ BIT(2)
29#define RTC_TIME 0xC
30#define RTC_ALARM1 0x10
31
32#define SOC_RTC_INTERRUPT 0x8
33#define SOC_RTC_ALARM1 BIT(0)
34#define SOC_RTC_ALARM2 BIT(1)
35#define SOC_RTC_ALARM1_MASK BIT(2)
36#define SOC_RTC_ALARM2_MASK BIT(3)
37
38struct armada38x_rtc {
39 struct rtc_device *rtc_dev;
40 void __iomem *regs;
41 void __iomem *regs_soc;
42 spinlock_t lock;
43 int irq;
44};
45
46
47
48
49
50
51static void rtc_delayed_write(u32 val, struct armada38x_rtc *rtc, int offset)
52{
53 writel(val, rtc->regs + offset);
54 udelay(5);
55}
56
57static int armada38x_rtc_read_time(struct device *dev, struct rtc_time *tm)
58{
59 struct armada38x_rtc *rtc = dev_get_drvdata(dev);
60 unsigned long time, time_check, flags;
61
62 spin_lock_irqsave(&rtc->lock, flags);
63 time = readl(rtc->regs + RTC_TIME);
64
65
66
67
68
69 time_check = readl(rtc->regs + RTC_TIME);
70 if ((time_check - time) > 1)
71 time_check = readl(rtc->regs + RTC_TIME);
72
73 spin_unlock_irqrestore(&rtc->lock, flags);
74
75 rtc_time_to_tm(time_check, tm);
76
77 return 0;
78}
79
80static int armada38x_rtc_set_time(struct device *dev, struct rtc_time *tm)
81{
82 struct armada38x_rtc *rtc = dev_get_drvdata(dev);
83 int ret = 0;
84 unsigned long time, flags;
85
86 ret = rtc_tm_to_time(tm, &time);
87
88 if (ret)
89 goto out;
90
91
92
93
94
95
96 spin_lock_irqsave(&rtc->lock, flags);
97 rtc_delayed_write(time, rtc, RTC_TIME);
98 rtc_delayed_write(0, rtc, RTC_STATUS);
99 rtc_delayed_write(0, rtc, RTC_STATUS);
100 spin_unlock_irqrestore(&rtc->lock, flags);
101
102out:
103 return ret;
104}
105
106static int armada38x_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
107{
108 struct armada38x_rtc *rtc = dev_get_drvdata(dev);
109 unsigned long time, flags;
110 u32 val;
111
112 spin_lock_irqsave(&rtc->lock, flags);
113
114 time = readl(rtc->regs + RTC_ALARM1);
115 val = readl(rtc->regs + RTC_IRQ1_CONF) & RTC_IRQ1_AL_EN;
116
117 spin_unlock_irqrestore(&rtc->lock, flags);
118
119 alrm->enabled = val ? 1 : 0;
120 rtc_time_to_tm(time, &alrm->time);
121
122 return 0;
123}
124
125static int armada38x_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
126{
127 struct armada38x_rtc *rtc = dev_get_drvdata(dev);
128 unsigned long time, flags;
129 int ret = 0;
130 u32 val;
131
132 ret = rtc_tm_to_time(&alrm->time, &time);
133
134 if (ret)
135 goto out;
136
137 spin_lock_irqsave(&rtc->lock, flags);
138
139 rtc_delayed_write(time, rtc, RTC_ALARM1);
140
141 if (alrm->enabled) {
142 rtc_delayed_write(RTC_IRQ1_AL_EN, rtc, RTC_IRQ1_CONF);
143 val = readl(rtc->regs_soc + SOC_RTC_INTERRUPT);
144 writel(val | SOC_RTC_ALARM1_MASK,
145 rtc->regs_soc + SOC_RTC_INTERRUPT);
146 }
147
148 spin_unlock_irqrestore(&rtc->lock, flags);
149
150out:
151 return ret;
152}
153
154static int armada38x_rtc_alarm_irq_enable(struct device *dev,
155 unsigned int enabled)
156{
157 struct armada38x_rtc *rtc = dev_get_drvdata(dev);
158 unsigned long flags;
159
160 spin_lock_irqsave(&rtc->lock, flags);
161
162 if (enabled)
163 rtc_delayed_write(RTC_IRQ1_AL_EN, rtc, RTC_IRQ1_CONF);
164 else
165 rtc_delayed_write(0, rtc, RTC_IRQ1_CONF);
166
167 spin_unlock_irqrestore(&rtc->lock, flags);
168
169 return 0;
170}
171
172static irqreturn_t armada38x_rtc_alarm_irq(int irq, void *data)
173{
174 struct armada38x_rtc *rtc = data;
175 u32 val;
176 int event = RTC_IRQF | RTC_AF;
177
178 dev_dbg(&rtc->rtc_dev->dev, "%s:irq(%d)\n", __func__, irq);
179
180 spin_lock(&rtc->lock);
181
182 val = readl(rtc->regs_soc + SOC_RTC_INTERRUPT);
183
184 writel(val & ~SOC_RTC_ALARM1, rtc->regs_soc + SOC_RTC_INTERRUPT);
185 val = readl(rtc->regs + RTC_IRQ1_CONF);
186
187 rtc_delayed_write(0, rtc, RTC_IRQ1_CONF);
188
189 rtc_delayed_write(RTC_STATUS_ALARM1, rtc, RTC_STATUS);
190
191 spin_unlock(&rtc->lock);
192
193 if (val & RTC_IRQ1_FREQ_EN) {
194 if (val & RTC_IRQ1_FREQ_1HZ)
195 event |= RTC_UF;
196 else
197 event |= RTC_PF;
198 }
199
200 rtc_update_irq(rtc->rtc_dev, 1, event);
201
202 return IRQ_HANDLED;
203}
204
205static struct rtc_class_ops armada38x_rtc_ops = {
206 .read_time = armada38x_rtc_read_time,
207 .set_time = armada38x_rtc_set_time,
208 .read_alarm = armada38x_rtc_read_alarm,
209 .set_alarm = armada38x_rtc_set_alarm,
210 .alarm_irq_enable = armada38x_rtc_alarm_irq_enable,
211};
212
213static __init int armada38x_rtc_probe(struct platform_device *pdev)
214{
215 struct resource *res;
216 struct armada38x_rtc *rtc;
217 int ret;
218
219 rtc = devm_kzalloc(&pdev->dev, sizeof(struct armada38x_rtc),
220 GFP_KERNEL);
221 if (!rtc)
222 return -ENOMEM;
223
224 spin_lock_init(&rtc->lock);
225
226 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "rtc");
227 rtc->regs = devm_ioremap_resource(&pdev->dev, res);
228 if (IS_ERR(rtc->regs))
229 return PTR_ERR(rtc->regs);
230 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "rtc-soc");
231 rtc->regs_soc = devm_ioremap_resource(&pdev->dev, res);
232 if (IS_ERR(rtc->regs_soc))
233 return PTR_ERR(rtc->regs_soc);
234
235 rtc->irq = platform_get_irq(pdev, 0);
236
237 if (rtc->irq < 0) {
238 dev_err(&pdev->dev, "no irq\n");
239 return rtc->irq;
240 }
241 if (devm_request_irq(&pdev->dev, rtc->irq, armada38x_rtc_alarm_irq,
242 0, pdev->name, rtc) < 0) {
243 dev_warn(&pdev->dev, "Interrupt not available.\n");
244 rtc->irq = -1;
245
246
247
248
249 armada38x_rtc_ops.set_alarm = NULL;
250 armada38x_rtc_ops.alarm_irq_enable = NULL;
251 }
252 platform_set_drvdata(pdev, rtc);
253 if (rtc->irq != -1)
254 device_init_wakeup(&pdev->dev, 1);
255
256 rtc->rtc_dev = devm_rtc_device_register(&pdev->dev, pdev->name,
257 &armada38x_rtc_ops, THIS_MODULE);
258 if (IS_ERR(rtc->rtc_dev)) {
259 ret = PTR_ERR(rtc->rtc_dev);
260 dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret);
261 return ret;
262 }
263 return 0;
264}
265
266#ifdef CONFIG_PM_SLEEP
267static int armada38x_rtc_suspend(struct device *dev)
268{
269 if (device_may_wakeup(dev)) {
270 struct armada38x_rtc *rtc = dev_get_drvdata(dev);
271
272 return enable_irq_wake(rtc->irq);
273 }
274
275 return 0;
276}
277
278static int armada38x_rtc_resume(struct device *dev)
279{
280 if (device_may_wakeup(dev)) {
281 struct armada38x_rtc *rtc = dev_get_drvdata(dev);
282
283 return disable_irq_wake(rtc->irq);
284 }
285
286 return 0;
287}
288#endif
289
290static SIMPLE_DEV_PM_OPS(armada38x_rtc_pm_ops,
291 armada38x_rtc_suspend, armada38x_rtc_resume);
292
293#ifdef CONFIG_OF
294static const struct of_device_id armada38x_rtc_of_match_table[] = {
295 { .compatible = "marvell,armada-380-rtc", },
296 {}
297};
298MODULE_DEVICE_TABLE(of, armada38x_rtc_of_match_table);
299#endif
300
301static struct platform_driver armada38x_rtc_driver = {
302 .driver = {
303 .name = "armada38x-rtc",
304 .pm = &armada38x_rtc_pm_ops,
305 .of_match_table = of_match_ptr(armada38x_rtc_of_match_table),
306 },
307};
308
309module_platform_driver_probe(armada38x_rtc_driver, armada38x_rtc_probe);
310
311MODULE_DESCRIPTION("Marvell Armada 38x RTC driver");
312MODULE_AUTHOR("Gregory CLEMENT <gregory.clement@free-electrons.com>");
313MODULE_LICENSE("GPL");
314
