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1/*
2 * Driver for the RTC in Marvell SoCs.
3 *
4 * This file is licensed under the terms of the GNU General Public
5 * License version 2. This program is licensed "as is" without any
6 * warranty of any kind, whether express or implied.
7 */
8
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) /* 12 hour mode */
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; /* assume 24 hour mode */
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 /* hw counts from year 2000, but tm_year is relative to 1900 */
95 tm->tm_year = bcd2bin(year) + 100;
96
97 return rtc_valid_tm(tm);
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; /* assume 24 hour mode */
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 /* hw counts from year 2000, but tm_year is relative to 1900 */
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 platform_device *pdev = to_platform_device(dev);
180 struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
181 void __iomem *ioaddr = pdata->ioaddr;
182
183 if (pdata->irq < 0)
184 return -EINVAL; /* fall back into rtc-dev's emulation */
185
186 if (enabled)
187 writel(1, ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
188 else
189 writel(0, ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
190 return 0;
191}
192
193static irqreturn_t mv_rtc_interrupt(int irq, void *data)
194{
195 struct rtc_plat_data *pdata = data;
196 void __iomem *ioaddr = pdata->ioaddr;
197
198 /* alarm irq? */
199 if (!readl(ioaddr + RTC_ALARM_INTERRUPT_CASUE_REG_OFFS))
200 return IRQ_NONE;
201
202 /* clear interrupt */
203 writel(0, ioaddr + RTC_ALARM_INTERRUPT_CASUE_REG_OFFS);
204 rtc_update_irq(pdata->rtc, 1, RTC_IRQF | RTC_AF);
205 return IRQ_HANDLED;
206}
207
208static const struct rtc_class_ops mv_rtc_ops = {
209 .read_time = mv_rtc_read_time,
210 .set_time = mv_rtc_set_time,
211};
212
213static const struct rtc_class_ops mv_rtc_alarm_ops = {
214 .read_time = mv_rtc_read_time,
215 .set_time = mv_rtc_set_time,
216 .read_alarm = mv_rtc_read_alarm,
217 .set_alarm = mv_rtc_set_alarm,
218 .alarm_irq_enable = mv_rtc_alarm_irq_enable,
219};
220
221static int __init mv_rtc_probe(struct platform_device *pdev)
222{
223 struct resource *res;
224 struct rtc_plat_data *pdata;
225 u32 rtc_time;
226 u32 rtc_date;
227 int ret = 0;
228
229 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
230 if (!pdata)
231 return -ENOMEM;
232
233 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
234 pdata->ioaddr = devm_ioremap_resource(&pdev->dev, res);
235 if (IS_ERR(pdata->ioaddr))
236 return PTR_ERR(pdata->ioaddr);
237
238 pdata->clk = devm_clk_get(&pdev->dev, NULL);
239 /* Not all SoCs require a clock.*/
240 if (!IS_ERR(pdata->clk))
241 clk_prepare_enable(pdata->clk);
242
243 /* make sure the 24 hour mode is enabled */
244 rtc_time = readl(pdata->ioaddr + RTC_TIME_REG_OFFS);
245 if (rtc_time & RTC_HOURS_12H_MODE) {
246 dev_err(&pdev->dev, "12 Hour mode is enabled but not supported.\n");
247 ret = -EINVAL;
248 goto out;
249 }
250
251 /* make sure it is actually functional */
252 if (rtc_time == 0x01000000) {
253 ssleep(1);
254 rtc_time = readl(pdata->ioaddr + RTC_TIME_REG_OFFS);
255 if (rtc_time == 0x01000000) {
256 dev_err(&pdev->dev, "internal RTC not ticking\n");
257 ret = -ENODEV;
258 goto out;
259 }
260 }
261
262 /*
263 * A date after January 19th, 2038 does not fit on 32 bits and
264 * will confuse the kernel and userspace. Reset to a sane date
265 * (January 1st, 2013) if we're after 2038.
266 */
267 rtc_date = readl(pdata->ioaddr + RTC_DATE_REG_OFFS);
268 if (bcd2bin((rtc_date >> RTC_YEAR_OFFS) & 0xff) >= 38) {
269 dev_info(&pdev->dev, "invalid RTC date, resetting to January 1st, 2013\n");
270 writel(0x130101, pdata->ioaddr + RTC_DATE_REG_OFFS);
271 }
272
273 pdata->irq = platform_get_irq(pdev, 0);
274
275 platform_set_drvdata(pdev, pdata);
276
277 if (pdata->irq >= 0) {
278 device_init_wakeup(&pdev->dev, 1);
279 pdata->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
280 &mv_rtc_alarm_ops,
281 THIS_MODULE);
282 } else {
283 pdata->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
284 &mv_rtc_ops, THIS_MODULE);
285 }
286 if (IS_ERR(pdata->rtc)) {
287 ret = PTR_ERR(pdata->rtc);
288 goto out;
289 }
290
291 if (pdata->irq >= 0) {
292 writel(0, pdata->ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
293 if (devm_request_irq(&pdev->dev, pdata->irq, mv_rtc_interrupt,
294 IRQF_SHARED,
295 pdev->name, pdata) < 0) {
296 dev_warn(&pdev->dev, "interrupt not available.\n");
297 pdata->irq = -1;
298 }
299 }
300
301 return 0;
302out:
303 if (!IS_ERR(pdata->clk))
304 clk_disable_unprepare(pdata->clk);
305
306 return ret;
307}
308
309static int __exit mv_rtc_remove(struct platform_device *pdev)
310{
311 struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
312
313 if (pdata->irq >= 0)
314 device_init_wakeup(&pdev->dev, 0);
315
316 if (!IS_ERR(pdata->clk))
317 clk_disable_unprepare(pdata->clk);
318
319 return 0;
320}
321
322#ifdef CONFIG_OF
323static const struct of_device_id rtc_mv_of_match_table[] = {
324 { .compatible = "marvell,orion-rtc", },
325 {}
326};
327MODULE_DEVICE_TABLE(of, rtc_mv_of_match_table);
328#endif
329
330static struct platform_driver mv_rtc_driver = {
331 .remove = __exit_p(mv_rtc_remove),
332 .driver = {
333 .name = "rtc-mv",
334 .of_match_table = of_match_ptr(rtc_mv_of_match_table),
335 },
336};
337
338module_platform_driver_probe(mv_rtc_driver, mv_rtc_probe);
339
340MODULE_AUTHOR("Saeed Bishara <saeed@marvell.com>");
341MODULE_DESCRIPTION("Marvell RTC driver");
342MODULE_LICENSE("GPL");
343MODULE_ALIAS("platform:rtc-mv");
1/*
2 * Driver for the RTC in Marvell SoCs.
3 *
4 * This file is licensed under the terms of the GNU General Public
5 * License version 2. This program is licensed "as is" without any
6 * warranty of any kind, whether express or implied.
7 */
8
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) /* 12 hours mode */
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; /* assume 24 hours mode */
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 /* hw counts from year 2000, but tm_year is relative to 1900 */
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; /* assume 24 hours mode */
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 /* hw counts from year 2000, but tm_year is relative to 1900 */
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; /* fall back into rtc-dev's emulation */
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 /* alarm irq? */
198 if (!readl(ioaddr + RTC_ALARM_INTERRUPT_CASUE_REG_OFFS))
199 return IRQ_NONE;
200
201 /* clear interrupt */
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 u32 rtc_date;
226 int ret = 0;
227
228 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
229 if (!pdata)
230 return -ENOMEM;
231
232 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
233 pdata->ioaddr = devm_ioremap_resource(&pdev->dev, res);
234 if (IS_ERR(pdata->ioaddr))
235 return PTR_ERR(pdata->ioaddr);
236
237 pdata->clk = devm_clk_get(&pdev->dev, NULL);
238 /* Not all SoCs require a clock.*/
239 if (!IS_ERR(pdata->clk))
240 clk_prepare_enable(pdata->clk);
241
242 /* make sure the 24 hours mode is enabled */
243 rtc_time = readl(pdata->ioaddr + RTC_TIME_REG_OFFS);
244 if (rtc_time & RTC_HOURS_12H_MODE) {
245 dev_err(&pdev->dev, "24 Hours mode not supported.\n");
246 ret = -EINVAL;
247 goto out;
248 }
249
250 /* make sure it is actually functional */
251 if (rtc_time == 0x01000000) {
252 ssleep(1);
253 rtc_time = readl(pdata->ioaddr + RTC_TIME_REG_OFFS);
254 if (rtc_time == 0x01000000) {
255 dev_err(&pdev->dev, "internal RTC not ticking\n");
256 ret = -ENODEV;
257 goto out;
258 }
259 }
260
261 /*
262 * A date after January 19th, 2038 does not fit on 32 bits and
263 * will confuse the kernel and userspace. Reset to a sane date
264 * (January 1st, 2013) if we're after 2038.
265 */
266 rtc_date = readl(pdata->ioaddr + RTC_DATE_REG_OFFS);
267 if (bcd2bin((rtc_date >> RTC_YEAR_OFFS) & 0xff) >= 38) {
268 dev_info(&pdev->dev, "invalid RTC date, resetting to January 1st, 2013\n");
269 writel(0x130101, pdata->ioaddr + RTC_DATE_REG_OFFS);
270 }
271
272 pdata->irq = platform_get_irq(pdev, 0);
273
274 platform_set_drvdata(pdev, pdata);
275
276 if (pdata->irq >= 0) {
277 device_init_wakeup(&pdev->dev, 1);
278 pdata->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
279 &mv_rtc_alarm_ops,
280 THIS_MODULE);
281 } else {
282 pdata->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
283 &mv_rtc_ops, THIS_MODULE);
284 }
285 if (IS_ERR(pdata->rtc)) {
286 ret = PTR_ERR(pdata->rtc);
287 goto out;
288 }
289
290 if (pdata->irq >= 0) {
291 writel(0, pdata->ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
292 if (devm_request_irq(&pdev->dev, pdata->irq, mv_rtc_interrupt,
293 IRQF_SHARED,
294 pdev->name, pdata) < 0) {
295 dev_warn(&pdev->dev, "interrupt not available.\n");
296 pdata->irq = -1;
297 }
298 }
299
300 return 0;
301out:
302 if (!IS_ERR(pdata->clk))
303 clk_disable_unprepare(pdata->clk);
304
305 return ret;
306}
307
308static int __exit mv_rtc_remove(struct platform_device *pdev)
309{
310 struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
311
312 if (pdata->irq >= 0)
313 device_init_wakeup(&pdev->dev, 0);
314
315 if (!IS_ERR(pdata->clk))
316 clk_disable_unprepare(pdata->clk);
317
318 return 0;
319}
320
321#ifdef CONFIG_OF
322static struct of_device_id rtc_mv_of_match_table[] = {
323 { .compatible = "marvell,orion-rtc", },
324 {}
325};
326#endif
327
328static struct platform_driver mv_rtc_driver = {
329 .remove = __exit_p(mv_rtc_remove),
330 .driver = {
331 .name = "rtc-mv",
332 .owner = THIS_MODULE,
333 .of_match_table = of_match_ptr(rtc_mv_of_match_table),
334 },
335};
336
337module_platform_driver_probe(mv_rtc_driver, mv_rtc_probe);
338
339MODULE_AUTHOR("Saeed Bishara <saeed@marvell.com>");
340MODULE_DESCRIPTION("Marvell RTC driver");
341MODULE_LICENSE("GPL");
342MODULE_ALIAS("platform:rtc-mv");