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9#include <linux/init.h>
10#include <linux/kernel.h>
11#include <linux/rtc.h>
12#include <linux/bcd.h>
13#include <linux/io.h>
14#include <linux/platform_device.h>
15#include <linux/of.h>
16#include <linux/delay.h>
17#include <linux/clk.h>
18#include <linux/gfp.h>
19#include <linux/module.h>
20
21
22#define RTC_TIME_REG_OFFS 0
23#define RTC_SECONDS_OFFS 0
24#define RTC_MINUTES_OFFS 8
25#define RTC_HOURS_OFFS 16
26#define RTC_WDAY_OFFS 24
27#define RTC_HOURS_12H_MODE (1 << 22)
28
29#define RTC_DATE_REG_OFFS 4
30#define RTC_MDAY_OFFS 0
31#define RTC_MONTH_OFFS 8
32#define RTC_YEAR_OFFS 16
33
34#define RTC_ALARM_TIME_REG_OFFS 8
35#define RTC_ALARM_DATE_REG_OFFS 0xc
36#define RTC_ALARM_VALID (1 << 7)
37
38#define RTC_ALARM_INTERRUPT_MASK_REG_OFFS 0x10
39#define RTC_ALARM_INTERRUPT_CASUE_REG_OFFS 0x14
40
41struct rtc_plat_data {
42 struct rtc_device *rtc;
43 void __iomem *ioaddr;
44 int irq;
45 struct clk *clk;
46};
47
48static int mv_rtc_set_time(struct device *dev, struct rtc_time *tm)
49{
50 struct rtc_plat_data *pdata = dev_get_drvdata(dev);
51 void __iomem *ioaddr = pdata->ioaddr;
52 u32 rtc_reg;
53
54 rtc_reg = (bin2bcd(tm->tm_sec) << RTC_SECONDS_OFFS) |
55 (bin2bcd(tm->tm_min) << RTC_MINUTES_OFFS) |
56 (bin2bcd(tm->tm_hour) << RTC_HOURS_OFFS) |
57 (bin2bcd(tm->tm_wday) << RTC_WDAY_OFFS);
58 writel(rtc_reg, ioaddr + RTC_TIME_REG_OFFS);
59
60 rtc_reg = (bin2bcd(tm->tm_mday) << RTC_MDAY_OFFS) |
61 (bin2bcd(tm->tm_mon + 1) << RTC_MONTH_OFFS) |
62 (bin2bcd(tm->tm_year % 100) << RTC_YEAR_OFFS);
63 writel(rtc_reg, ioaddr + RTC_DATE_REG_OFFS);
64
65 return 0;
66}
67
68static int mv_rtc_read_time(struct device *dev, struct rtc_time *tm)
69{
70 struct rtc_plat_data *pdata = dev_get_drvdata(dev);
71 void __iomem *ioaddr = pdata->ioaddr;
72 u32 rtc_time, rtc_date;
73 unsigned int year, month, day, hour, minute, second, wday;
74
75 rtc_time = readl(ioaddr + RTC_TIME_REG_OFFS);
76 rtc_date = readl(ioaddr + RTC_DATE_REG_OFFS);
77
78 second = rtc_time & 0x7f;
79 minute = (rtc_time >> RTC_MINUTES_OFFS) & 0x7f;
80 hour = (rtc_time >> RTC_HOURS_OFFS) & 0x3f;
81 wday = (rtc_time >> RTC_WDAY_OFFS) & 0x7;
82
83 day = rtc_date & 0x3f;
84 month = (rtc_date >> RTC_MONTH_OFFS) & 0x3f;
85 year = (rtc_date >> RTC_YEAR_OFFS) & 0xff;
86
87 tm->tm_sec = bcd2bin(second);
88 tm->tm_min = bcd2bin(minute);
89 tm->tm_hour = bcd2bin(hour);
90 tm->tm_mday = bcd2bin(day);
91 tm->tm_wday = bcd2bin(wday);
92 tm->tm_mon = bcd2bin(month) - 1;
93
94 tm->tm_year = bcd2bin(year) + 100;
95
96 return rtc_valid_tm(tm);
97}
98
99static int mv_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
100{
101 struct rtc_plat_data *pdata = dev_get_drvdata(dev);
102 void __iomem *ioaddr = pdata->ioaddr;
103 u32 rtc_time, rtc_date;
104 unsigned int year, month, day, hour, minute, second, wday;
105
106 rtc_time = readl(ioaddr + RTC_ALARM_TIME_REG_OFFS);
107 rtc_date = readl(ioaddr + RTC_ALARM_DATE_REG_OFFS);
108
109 second = rtc_time & 0x7f;
110 minute = (rtc_time >> RTC_MINUTES_OFFS) & 0x7f;
111 hour = (rtc_time >> RTC_HOURS_OFFS) & 0x3f;
112 wday = (rtc_time >> RTC_WDAY_OFFS) & 0x7;
113
114 day = rtc_date & 0x3f;
115 month = (rtc_date >> RTC_MONTH_OFFS) & 0x3f;
116 year = (rtc_date >> RTC_YEAR_OFFS) & 0xff;
117
118 alm->time.tm_sec = bcd2bin(second);
119 alm->time.tm_min = bcd2bin(minute);
120 alm->time.tm_hour = bcd2bin(hour);
121 alm->time.tm_mday = bcd2bin(day);
122 alm->time.tm_wday = bcd2bin(wday);
123 alm->time.tm_mon = bcd2bin(month) - 1;
124
125 alm->time.tm_year = bcd2bin(year) + 100;
126
127 if (rtc_valid_tm(&alm->time) < 0) {
128 dev_err(dev, "retrieved alarm date/time is not valid.\n");
129 rtc_time_to_tm(0, &alm->time);
130 }
131
132 alm->enabled = !!readl(ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
133 return 0;
134}
135
136static int mv_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
137{
138 struct rtc_plat_data *pdata = dev_get_drvdata(dev);
139 void __iomem *ioaddr = pdata->ioaddr;
140 u32 rtc_reg = 0;
141
142 if (alm->time.tm_sec >= 0)
143 rtc_reg |= (RTC_ALARM_VALID | bin2bcd(alm->time.tm_sec))
144 << RTC_SECONDS_OFFS;
145 if (alm->time.tm_min >= 0)
146 rtc_reg |= (RTC_ALARM_VALID | bin2bcd(alm->time.tm_min))
147 << RTC_MINUTES_OFFS;
148 if (alm->time.tm_hour >= 0)
149 rtc_reg |= (RTC_ALARM_VALID | bin2bcd(alm->time.tm_hour))
150 << RTC_HOURS_OFFS;
151
152 writel(rtc_reg, ioaddr + RTC_ALARM_TIME_REG_OFFS);
153
154 if (alm->time.tm_mday >= 0)
155 rtc_reg = (RTC_ALARM_VALID | bin2bcd(alm->time.tm_mday))
156 << RTC_MDAY_OFFS;
157 else
158 rtc_reg = 0;
159
160 if (alm->time.tm_mon >= 0)
161 rtc_reg |= (RTC_ALARM_VALID | bin2bcd(alm->time.tm_mon + 1))
162 << RTC_MONTH_OFFS;
163
164 if (alm->time.tm_year >= 0)
165 rtc_reg |= (RTC_ALARM_VALID | bin2bcd(alm->time.tm_year % 100))
166 << RTC_YEAR_OFFS;
167
168 writel(rtc_reg, ioaddr + RTC_ALARM_DATE_REG_OFFS);
169 writel(0, ioaddr + RTC_ALARM_INTERRUPT_CASUE_REG_OFFS);
170 writel(alm->enabled ? 1 : 0,
171 ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
172
173 return 0;
174}
175
176static int mv_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
177{
178 struct platform_device *pdev = to_platform_device(dev);
179 struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
180 void __iomem *ioaddr = pdata->ioaddr;
181
182 if (pdata->irq < 0)
183 return -EINVAL;
184
185 if (enabled)
186 writel(1, ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
187 else
188 writel(0, ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
189 return 0;
190}
191
192static irqreturn_t mv_rtc_interrupt(int irq, void *data)
193{
194 struct rtc_plat_data *pdata = data;
195 void __iomem *ioaddr = pdata->ioaddr;
196
197
198 if (!readl(ioaddr + RTC_ALARM_INTERRUPT_CASUE_REG_OFFS))
199 return IRQ_NONE;
200
201
202 writel(0, ioaddr + RTC_ALARM_INTERRUPT_CASUE_REG_OFFS);
203 rtc_update_irq(pdata->rtc, 1, RTC_IRQF | RTC_AF);
204 return IRQ_HANDLED;
205}
206
207static const struct rtc_class_ops mv_rtc_ops = {
208 .read_time = mv_rtc_read_time,
209 .set_time = mv_rtc_set_time,
210};
211
212static const struct rtc_class_ops mv_rtc_alarm_ops = {
213 .read_time = mv_rtc_read_time,
214 .set_time = mv_rtc_set_time,
215 .read_alarm = mv_rtc_read_alarm,
216 .set_alarm = mv_rtc_set_alarm,
217 .alarm_irq_enable = mv_rtc_alarm_irq_enable,
218};
219
220static int __init mv_rtc_probe(struct platform_device *pdev)
221{
222 struct resource *res;
223 struct rtc_plat_data *pdata;
224 u32 rtc_time;
225 int ret = 0;
226
227 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
228 if (!pdata)
229 return -ENOMEM;
230
231 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
232 pdata->ioaddr = devm_ioremap_resource(&pdev->dev, res);
233 if (IS_ERR(pdata->ioaddr))
234 return PTR_ERR(pdata->ioaddr);
235
236 pdata->clk = devm_clk_get(&pdev->dev, NULL);
237
238 if (!IS_ERR(pdata->clk))
239 clk_prepare_enable(pdata->clk);
240
241
242 rtc_time = readl(pdata->ioaddr + RTC_TIME_REG_OFFS);
243 if (rtc_time & RTC_HOURS_12H_MODE) {
244 dev_err(&pdev->dev, "24 Hours mode not supported.\n");
245 ret = -EINVAL;
246 goto out;
247 }
248
249
250 if (rtc_time == 0x01000000) {
251 ssleep(1);
252 rtc_time = readl(pdata->ioaddr + RTC_TIME_REG_OFFS);
253 if (rtc_time == 0x01000000) {
254 dev_err(&pdev->dev, "internal RTC not ticking\n");
255 ret = -ENODEV;
256 goto out;
257 }
258 }
259
260 pdata->irq = platform_get_irq(pdev, 0);
261
262 platform_set_drvdata(pdev, pdata);
263
264 if (pdata->irq >= 0) {
265 device_init_wakeup(&pdev->dev, 1);
266 pdata->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
267 &mv_rtc_alarm_ops,
268 THIS_MODULE);
269 } else {
270 pdata->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
271 &mv_rtc_ops, THIS_MODULE);
272 }
273 if (IS_ERR(pdata->rtc)) {
274 ret = PTR_ERR(pdata->rtc);
275 goto out;
276 }
277
278 if (pdata->irq >= 0) {
279 writel(0, pdata->ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
280 if (devm_request_irq(&pdev->dev, pdata->irq, mv_rtc_interrupt,
281 IRQF_SHARED,
282 pdev->name, pdata) < 0) {
283 dev_warn(&pdev->dev, "interrupt not available.\n");
284 pdata->irq = -1;
285 }
286 }
287
288 return 0;
289out:
290 if (!IS_ERR(pdata->clk))
291 clk_disable_unprepare(pdata->clk);
292
293 return ret;
294}
295
296static int __exit mv_rtc_remove(struct platform_device *pdev)
297{
298 struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
299
300 if (pdata->irq >= 0)
301 device_init_wakeup(&pdev->dev, 0);
302
303 if (!IS_ERR(pdata->clk))
304 clk_disable_unprepare(pdata->clk);
305
306 return 0;
307}
308
309#ifdef CONFIG_OF
310static struct of_device_id rtc_mv_of_match_table[] = {
311 { .compatible = "marvell,orion-rtc", },
312 {}
313};
314#endif
315
316static struct platform_driver mv_rtc_driver = {
317 .remove = __exit_p(mv_rtc_remove),
318 .driver = {
319 .name = "rtc-mv",
320 .owner = THIS_MODULE,
321 .of_match_table = of_match_ptr(rtc_mv_of_match_table),
322 },
323};
324
325module_platform_driver_probe(mv_rtc_driver, mv_rtc_probe);
326
327MODULE_AUTHOR("Saeed Bishara <saeed@marvell.com>");
328MODULE_DESCRIPTION("Marvell RTC driver");
329MODULE_LICENSE("GPL");
330MODULE_ALIAS("platform:rtc-mv");
331
