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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/io.h>
14#include <linux/platform_device.h>
15#include <linux/of.h>
16#include <linux/delay.h>
17#include <linux/gfp.h>
18#include <linux/module.h>
19
20
21#define RTC_TIME_REG_OFFS 0
22#define RTC_SECONDS_OFFS 0
23#define RTC_MINUTES_OFFS 8
24#define RTC_HOURS_OFFS 16
25#define RTC_WDAY_OFFS 24
26#define RTC_HOURS_12H_MODE (1 << 22) /* 12 hours mode */
27
28#define RTC_DATE_REG_OFFS 4
29#define RTC_MDAY_OFFS 0
30#define RTC_MONTH_OFFS 8
31#define RTC_YEAR_OFFS 16
32
33#define RTC_ALARM_TIME_REG_OFFS 8
34#define RTC_ALARM_DATE_REG_OFFS 0xc
35#define RTC_ALARM_VALID (1 << 7)
36
37#define RTC_ALARM_INTERRUPT_MASK_REG_OFFS 0x10
38#define RTC_ALARM_INTERRUPT_CASUE_REG_OFFS 0x14
39
40struct rtc_plat_data {
41 struct rtc_device *rtc;
42 void __iomem *ioaddr;
43 int irq;
44};
45
46static int mv_rtc_set_time(struct device *dev, struct rtc_time *tm)
47{
48 struct rtc_plat_data *pdata = dev_get_drvdata(dev);
49 void __iomem *ioaddr = pdata->ioaddr;
50 u32 rtc_reg;
51
52 rtc_reg = (bin2bcd(tm->tm_sec) << RTC_SECONDS_OFFS) |
53 (bin2bcd(tm->tm_min) << RTC_MINUTES_OFFS) |
54 (bin2bcd(tm->tm_hour) << RTC_HOURS_OFFS) |
55 (bin2bcd(tm->tm_wday) << RTC_WDAY_OFFS);
56 writel(rtc_reg, ioaddr + RTC_TIME_REG_OFFS);
57
58 rtc_reg = (bin2bcd(tm->tm_mday) << RTC_MDAY_OFFS) |
59 (bin2bcd(tm->tm_mon + 1) << RTC_MONTH_OFFS) |
60 (bin2bcd(tm->tm_year % 100) << RTC_YEAR_OFFS);
61 writel(rtc_reg, ioaddr + RTC_DATE_REG_OFFS);
62
63 return 0;
64}
65
66static int mv_rtc_read_time(struct device *dev, struct rtc_time *tm)
67{
68 struct rtc_plat_data *pdata = dev_get_drvdata(dev);
69 void __iomem *ioaddr = pdata->ioaddr;
70 u32 rtc_time, rtc_date;
71 unsigned int year, month, day, hour, minute, second, wday;
72
73 rtc_time = readl(ioaddr + RTC_TIME_REG_OFFS);
74 rtc_date = readl(ioaddr + RTC_DATE_REG_OFFS);
75
76 second = rtc_time & 0x7f;
77 minute = (rtc_time >> RTC_MINUTES_OFFS) & 0x7f;
78 hour = (rtc_time >> RTC_HOURS_OFFS) & 0x3f; /* assume 24 hours mode */
79 wday = (rtc_time >> RTC_WDAY_OFFS) & 0x7;
80
81 day = rtc_date & 0x3f;
82 month = (rtc_date >> RTC_MONTH_OFFS) & 0x3f;
83 year = (rtc_date >> RTC_YEAR_OFFS) & 0xff;
84
85 tm->tm_sec = bcd2bin(second);
86 tm->tm_min = bcd2bin(minute);
87 tm->tm_hour = bcd2bin(hour);
88 tm->tm_mday = bcd2bin(day);
89 tm->tm_wday = bcd2bin(wday);
90 tm->tm_mon = bcd2bin(month) - 1;
91 /* hw counts from year 2000, but tm_year is relative to 1900 */
92 tm->tm_year = bcd2bin(year) + 100;
93
94 return rtc_valid_tm(tm);
95}
96
97static int mv_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
98{
99 struct rtc_plat_data *pdata = dev_get_drvdata(dev);
100 void __iomem *ioaddr = pdata->ioaddr;
101 u32 rtc_time, rtc_date;
102 unsigned int year, month, day, hour, minute, second, wday;
103
104 rtc_time = readl(ioaddr + RTC_ALARM_TIME_REG_OFFS);
105 rtc_date = readl(ioaddr + RTC_ALARM_DATE_REG_OFFS);
106
107 second = rtc_time & 0x7f;
108 minute = (rtc_time >> RTC_MINUTES_OFFS) & 0x7f;
109 hour = (rtc_time >> RTC_HOURS_OFFS) & 0x3f; /* assume 24 hours mode */
110 wday = (rtc_time >> RTC_WDAY_OFFS) & 0x7;
111
112 day = rtc_date & 0x3f;
113 month = (rtc_date >> RTC_MONTH_OFFS) & 0x3f;
114 year = (rtc_date >> RTC_YEAR_OFFS) & 0xff;
115
116 alm->time.tm_sec = bcd2bin(second);
117 alm->time.tm_min = bcd2bin(minute);
118 alm->time.tm_hour = bcd2bin(hour);
119 alm->time.tm_mday = bcd2bin(day);
120 alm->time.tm_wday = bcd2bin(wday);
121 alm->time.tm_mon = bcd2bin(month) - 1;
122 /* hw counts from year 2000, but tm_year is relative to 1900 */
123 alm->time.tm_year = bcd2bin(year) + 100;
124
125 if (rtc_valid_tm(&alm->time) < 0) {
126 dev_err(dev, "retrieved alarm date/time is not valid.\n");
127 rtc_time_to_tm(0, &alm->time);
128 }
129
130 alm->enabled = !!readl(ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
131 return 0;
132}
133
134static int mv_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
135{
136 struct rtc_plat_data *pdata = dev_get_drvdata(dev);
137 void __iomem *ioaddr = pdata->ioaddr;
138 u32 rtc_reg = 0;
139
140 if (alm->time.tm_sec >= 0)
141 rtc_reg |= (RTC_ALARM_VALID | bin2bcd(alm->time.tm_sec))
142 << RTC_SECONDS_OFFS;
143 if (alm->time.tm_min >= 0)
144 rtc_reg |= (RTC_ALARM_VALID | bin2bcd(alm->time.tm_min))
145 << RTC_MINUTES_OFFS;
146 if (alm->time.tm_hour >= 0)
147 rtc_reg |= (RTC_ALARM_VALID | bin2bcd(alm->time.tm_hour))
148 << RTC_HOURS_OFFS;
149
150 writel(rtc_reg, ioaddr + RTC_ALARM_TIME_REG_OFFS);
151
152 if (alm->time.tm_mday >= 0)
153 rtc_reg = (RTC_ALARM_VALID | bin2bcd(alm->time.tm_mday))
154 << RTC_MDAY_OFFS;
155 else
156 rtc_reg = 0;
157
158 if (alm->time.tm_mon >= 0)
159 rtc_reg |= (RTC_ALARM_VALID | bin2bcd(alm->time.tm_mon + 1))
160 << RTC_MONTH_OFFS;
161
162 if (alm->time.tm_year >= 0)
163 rtc_reg |= (RTC_ALARM_VALID | bin2bcd(alm->time.tm_year % 100))
164 << RTC_YEAR_OFFS;
165
166 writel(rtc_reg, ioaddr + RTC_ALARM_DATE_REG_OFFS);
167 writel(0, ioaddr + RTC_ALARM_INTERRUPT_CASUE_REG_OFFS);
168 writel(alm->enabled ? 1 : 0,
169 ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
170
171 return 0;
172}
173
174static int mv_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
175{
176 struct platform_device *pdev = to_platform_device(dev);
177 struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
178 void __iomem *ioaddr = pdata->ioaddr;
179
180 if (pdata->irq < 0)
181 return -EINVAL; /* fall back into rtc-dev's emulation */
182
183 if (enabled)
184 writel(1, ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
185 else
186 writel(0, ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
187 return 0;
188}
189
190static irqreturn_t mv_rtc_interrupt(int irq, void *data)
191{
192 struct rtc_plat_data *pdata = data;
193 void __iomem *ioaddr = pdata->ioaddr;
194
195 /* alarm irq? */
196 if (!readl(ioaddr + RTC_ALARM_INTERRUPT_CASUE_REG_OFFS))
197 return IRQ_NONE;
198
199 /* clear interrupt */
200 writel(0, ioaddr + RTC_ALARM_INTERRUPT_CASUE_REG_OFFS);
201 rtc_update_irq(pdata->rtc, 1, RTC_IRQF | RTC_AF);
202 return IRQ_HANDLED;
203}
204
205static const struct rtc_class_ops mv_rtc_ops = {
206 .read_time = mv_rtc_read_time,
207 .set_time = mv_rtc_set_time,
208};
209
210static const struct rtc_class_ops mv_rtc_alarm_ops = {
211 .read_time = mv_rtc_read_time,
212 .set_time = mv_rtc_set_time,
213 .read_alarm = mv_rtc_read_alarm,
214 .set_alarm = mv_rtc_set_alarm,
215 .alarm_irq_enable = mv_rtc_alarm_irq_enable,
216};
217
218static int __devinit mv_rtc_probe(struct platform_device *pdev)
219{
220 struct resource *res;
221 struct rtc_plat_data *pdata;
222 resource_size_t size;
223 u32 rtc_time;
224
225 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
226 if (!res)
227 return -ENODEV;
228
229 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
230 if (!pdata)
231 return -ENOMEM;
232
233 size = resource_size(res);
234 if (!devm_request_mem_region(&pdev->dev, res->start, size,
235 pdev->name))
236 return -EBUSY;
237
238 pdata->ioaddr = devm_ioremap(&pdev->dev, res->start, size);
239 if (!pdata->ioaddr)
240 return -ENOMEM;
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 return -EINVAL;
247 }
248
249 /* make sure it is actually functional */
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 return -ENODEV;
256 }
257 }
258
259 pdata->irq = platform_get_irq(pdev, 0);
260
261 platform_set_drvdata(pdev, pdata);
262
263 if (pdata->irq >= 0) {
264 device_init_wakeup(&pdev->dev, 1);
265 pdata->rtc = rtc_device_register(pdev->name, &pdev->dev,
266 &mv_rtc_alarm_ops,
267 THIS_MODULE);
268 } else
269 pdata->rtc = rtc_device_register(pdev->name, &pdev->dev,
270 &mv_rtc_ops, THIS_MODULE);
271 if (IS_ERR(pdata->rtc))
272 return PTR_ERR(pdata->rtc);
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;
285}
286
287static int __exit mv_rtc_remove(struct platform_device *pdev)
288{
289 struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
290
291 if (pdata->irq >= 0)
292 device_init_wakeup(&pdev->dev, 0);
293
294 rtc_device_unregister(pdata->rtc);
295 return 0;
296}
297
298#ifdef CONFIG_OF
299static struct of_device_id rtc_mv_of_match_table[] = {
300 { .compatible = "mrvl,orion-rtc", },
301 {}
302};
303#endif
304
305static struct platform_driver mv_rtc_driver = {
306 .remove = __exit_p(mv_rtc_remove),
307 .driver = {
308 .name = "rtc-mv",
309 .owner = THIS_MODULE,
310 .of_match_table = of_match_ptr(rtc_mv_of_match_table),
311 },
312};
313
314static __init int mv_init(void)
315{
316 return platform_driver_probe(&mv_rtc_driver, mv_rtc_probe);
317}
318
319static __exit void mv_exit(void)
320{
321 platform_driver_unregister(&mv_rtc_driver);
322}
323
324module_init(mv_init);
325module_exit(mv_exit);
326
327MODULE_AUTHOR("Saeed Bishara <saeed@marvell.com>");
328MODULE_DESCRIPTION("Marvell RTC driver");
329MODULE_LICENSE("GPL");
330MODULE_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");