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