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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 if (rtc_valid_tm(&alm->time) < 0) {
129 dev_err(dev, "retrieved alarm date/time is not valid.\n");
130 rtc_time_to_tm(0, &alm->time);
131 }
132
133 alm->enabled = !!readl(ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
134 return 0;
135}
136
137static int mv_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
138{
139 struct rtc_plat_data *pdata = dev_get_drvdata(dev);
140 void __iomem *ioaddr = pdata->ioaddr;
141 u32 rtc_reg = 0;
142
143 if (alm->time.tm_sec >= 0)
144 rtc_reg |= (RTC_ALARM_VALID | bin2bcd(alm->time.tm_sec))
145 << RTC_SECONDS_OFFS;
146 if (alm->time.tm_min >= 0)
147 rtc_reg |= (RTC_ALARM_VALID | bin2bcd(alm->time.tm_min))
148 << RTC_MINUTES_OFFS;
149 if (alm->time.tm_hour >= 0)
150 rtc_reg |= (RTC_ALARM_VALID | bin2bcd(alm->time.tm_hour))
151 << RTC_HOURS_OFFS;
152
153 writel(rtc_reg, ioaddr + RTC_ALARM_TIME_REG_OFFS);
154
155 if (alm->time.tm_mday >= 0)
156 rtc_reg = (RTC_ALARM_VALID | bin2bcd(alm->time.tm_mday))
157 << RTC_MDAY_OFFS;
158 else
159 rtc_reg = 0;
160
161 if (alm->time.tm_mon >= 0)
162 rtc_reg |= (RTC_ALARM_VALID | bin2bcd(alm->time.tm_mon + 1))
163 << RTC_MONTH_OFFS;
164
165 if (alm->time.tm_year >= 0)
166 rtc_reg |= (RTC_ALARM_VALID | bin2bcd(alm->time.tm_year % 100))
167 << RTC_YEAR_OFFS;
168
169 writel(rtc_reg, ioaddr + RTC_ALARM_DATE_REG_OFFS);
170 writel(0, ioaddr + RTC_ALARM_INTERRUPT_CASUE_REG_OFFS);
171 writel(alm->enabled ? 1 : 0,
172 ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
173
174 return 0;
175}
176
177static int mv_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
178{
179 struct rtc_plat_data *pdata = dev_get_drvdata(dev);
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, "12 Hour mode is enabled but 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 const struct of_device_id rtc_mv_of_match_table[] = {
311 { .compatible = "marvell,orion-rtc", },
312 {}
313};
314MODULE_DEVICE_TABLE(of, rtc_mv_of_match_table);
315#endif
316
317static struct platform_driver mv_rtc_driver = {
318 .remove = __exit_p(mv_rtc_remove),
319 .driver = {
320 .name = "rtc-mv",
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
