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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Driver for the RTC in Marvell SoCs.
4 */
5
6#include <linux/init.h>
7#include <linux/kernel.h>
8#include <linux/rtc.h>
9#include <linux/bcd.h>
10#include <linux/bitops.h>
11#include <linux/io.h>
12#include <linux/platform_device.h>
13#include <linux/of.h>
14#include <linux/delay.h>
15#include <linux/clk.h>
16#include <linux/gfp.h>
17#include <linux/module.h>
18
19
20#define RTC_TIME_REG_OFFS 0
21#define RTC_SECONDS_OFFS 0
22#define RTC_MINUTES_OFFS 8
23#define RTC_HOURS_OFFS 16
24#define RTC_WDAY_OFFS 24
25#define RTC_HOURS_12H_MODE BIT(22) /* 12 hour mode */
26
27#define RTC_DATE_REG_OFFS 4
28#define RTC_MDAY_OFFS 0
29#define RTC_MONTH_OFFS 8
30#define RTC_YEAR_OFFS 16
31
32#define RTC_ALARM_TIME_REG_OFFS 8
33#define RTC_ALARM_DATE_REG_OFFS 0xc
34#define RTC_ALARM_VALID BIT(7)
35
36#define RTC_ALARM_INTERRUPT_MASK_REG_OFFS 0x10
37#define RTC_ALARM_INTERRUPT_CASUE_REG_OFFS 0x14
38
39struct rtc_plat_data {
40 struct rtc_device *rtc;
41 void __iomem *ioaddr;
42 int irq;
43 struct clk *clk;
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 hour 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 0;
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 hour 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 alm->enabled = !!readl(ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
126
127 return rtc_valid_tm(&alm->time);
128}
129
130static int mv_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
131{
132 struct rtc_plat_data *pdata = dev_get_drvdata(dev);
133 void __iomem *ioaddr = pdata->ioaddr;
134 u32 rtc_reg = 0;
135
136 if (alm->time.tm_sec >= 0)
137 rtc_reg |= (RTC_ALARM_VALID | bin2bcd(alm->time.tm_sec))
138 << RTC_SECONDS_OFFS;
139 if (alm->time.tm_min >= 0)
140 rtc_reg |= (RTC_ALARM_VALID | bin2bcd(alm->time.tm_min))
141 << RTC_MINUTES_OFFS;
142 if (alm->time.tm_hour >= 0)
143 rtc_reg |= (RTC_ALARM_VALID | bin2bcd(alm->time.tm_hour))
144 << RTC_HOURS_OFFS;
145
146 writel(rtc_reg, ioaddr + RTC_ALARM_TIME_REG_OFFS);
147
148 if (alm->time.tm_mday >= 0)
149 rtc_reg = (RTC_ALARM_VALID | bin2bcd(alm->time.tm_mday))
150 << RTC_MDAY_OFFS;
151 else
152 rtc_reg = 0;
153
154 if (alm->time.tm_mon >= 0)
155 rtc_reg |= (RTC_ALARM_VALID | bin2bcd(alm->time.tm_mon + 1))
156 << RTC_MONTH_OFFS;
157
158 if (alm->time.tm_year >= 0)
159 rtc_reg |= (RTC_ALARM_VALID | bin2bcd(alm->time.tm_year - 100))
160 << RTC_YEAR_OFFS;
161
162 writel(rtc_reg, ioaddr + RTC_ALARM_DATE_REG_OFFS);
163 writel(0, ioaddr + RTC_ALARM_INTERRUPT_CASUE_REG_OFFS);
164 writel(alm->enabled ? 1 : 0,
165 ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
166
167 return 0;
168}
169
170static int mv_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
171{
172 struct rtc_plat_data *pdata = dev_get_drvdata(dev);
173 void __iomem *ioaddr = pdata->ioaddr;
174
175 if (pdata->irq < 0)
176 return -EINVAL; /* fall back into rtc-dev's emulation */
177
178 if (enabled)
179 writel(1, ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
180 else
181 writel(0, ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
182 return 0;
183}
184
185static irqreturn_t mv_rtc_interrupt(int irq, void *data)
186{
187 struct rtc_plat_data *pdata = data;
188 void __iomem *ioaddr = pdata->ioaddr;
189
190 /* alarm irq? */
191 if (!readl(ioaddr + RTC_ALARM_INTERRUPT_CASUE_REG_OFFS))
192 return IRQ_NONE;
193
194 /* clear interrupt */
195 writel(0, ioaddr + RTC_ALARM_INTERRUPT_CASUE_REG_OFFS);
196 rtc_update_irq(pdata->rtc, 1, RTC_IRQF | RTC_AF);
197 return IRQ_HANDLED;
198}
199
200static const struct rtc_class_ops mv_rtc_ops = {
201 .read_time = mv_rtc_read_time,
202 .set_time = mv_rtc_set_time,
203 .read_alarm = mv_rtc_read_alarm,
204 .set_alarm = mv_rtc_set_alarm,
205 .alarm_irq_enable = mv_rtc_alarm_irq_enable,
206};
207
208static int __init mv_rtc_probe(struct platform_device *pdev)
209{
210 struct rtc_plat_data *pdata;
211 u32 rtc_time;
212 int ret = 0;
213
214 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
215 if (!pdata)
216 return -ENOMEM;
217
218 pdata->ioaddr = devm_platform_ioremap_resource(pdev, 0);
219 if (IS_ERR(pdata->ioaddr))
220 return PTR_ERR(pdata->ioaddr);
221
222 pdata->clk = devm_clk_get(&pdev->dev, NULL);
223 /* Not all SoCs require a clock.*/
224 if (!IS_ERR(pdata->clk))
225 clk_prepare_enable(pdata->clk);
226
227 /* make sure the 24 hour mode is enabled */
228 rtc_time = readl(pdata->ioaddr + RTC_TIME_REG_OFFS);
229 if (rtc_time & RTC_HOURS_12H_MODE) {
230 dev_err(&pdev->dev, "12 Hour mode is enabled but not supported.\n");
231 ret = -EINVAL;
232 goto out;
233 }
234
235 /* make sure it is actually functional */
236 if (rtc_time == 0x01000000) {
237 ssleep(1);
238 rtc_time = readl(pdata->ioaddr + RTC_TIME_REG_OFFS);
239 if (rtc_time == 0x01000000) {
240 dev_err(&pdev->dev, "internal RTC not ticking\n");
241 ret = -ENODEV;
242 goto out;
243 }
244 }
245
246 pdata->irq = platform_get_irq(pdev, 0);
247
248 platform_set_drvdata(pdev, pdata);
249
250 pdata->rtc = devm_rtc_allocate_device(&pdev->dev);
251 if (IS_ERR(pdata->rtc)) {
252 ret = PTR_ERR(pdata->rtc);
253 goto out;
254 }
255
256 if (pdata->irq >= 0) {
257 writel(0, pdata->ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
258 if (devm_request_irq(&pdev->dev, pdata->irq, mv_rtc_interrupt,
259 IRQF_SHARED,
260 pdev->name, pdata) < 0) {
261 dev_warn(&pdev->dev, "interrupt not available.\n");
262 pdata->irq = -1;
263 }
264 }
265
266 if (pdata->irq >= 0)
267 device_init_wakeup(&pdev->dev, 1);
268 else
269 clear_bit(RTC_FEATURE_ALARM, pdata->rtc->features);
270
271 pdata->rtc->ops = &mv_rtc_ops;
272 pdata->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
273 pdata->rtc->range_max = RTC_TIMESTAMP_END_2099;
274
275 ret = devm_rtc_register_device(pdata->rtc);
276 if (!ret)
277 return 0;
278out:
279 if (!IS_ERR(pdata->clk))
280 clk_disable_unprepare(pdata->clk);
281
282 return ret;
283}
284
285static int __exit mv_rtc_remove(struct platform_device *pdev)
286{
287 struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
288
289 if (pdata->irq >= 0)
290 device_init_wakeup(&pdev->dev, 0);
291
292 if (!IS_ERR(pdata->clk))
293 clk_disable_unprepare(pdata->clk);
294
295 return 0;
296}
297
298#ifdef CONFIG_OF
299static const struct of_device_id rtc_mv_of_match_table[] = {
300 { .compatible = "marvell,orion-rtc", },
301 {}
302};
303MODULE_DEVICE_TABLE(of, rtc_mv_of_match_table);
304#endif
305
306static struct platform_driver mv_rtc_driver = {
307 .remove = __exit_p(mv_rtc_remove),
308 .driver = {
309 .name = "rtc-mv",
310 .of_match_table = of_match_ptr(rtc_mv_of_match_table),
311 },
312};
313
314module_platform_driver_probe(mv_rtc_driver, mv_rtc_probe);
315
316MODULE_AUTHOR("Saeed Bishara <saeed@marvell.com>");
317MODULE_DESCRIPTION("Marvell RTC driver");
318MODULE_LICENSE("GPL");
319MODULE_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/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 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; /* 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 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 hour 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, "12 Hour mode is enabled but 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 pdata->irq = platform_get_irq(pdev, 0);
262
263 platform_set_drvdata(pdev, pdata);
264
265 if (pdata->irq >= 0) {
266 device_init_wakeup(&pdev->dev, 1);
267 pdata->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
268 &mv_rtc_alarm_ops,
269 THIS_MODULE);
270 } else {
271 pdata->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
272 &mv_rtc_ops, THIS_MODULE);
273 }
274 if (IS_ERR(pdata->rtc)) {
275 ret = PTR_ERR(pdata->rtc);
276 goto out;
277 }
278
279 if (pdata->irq >= 0) {
280 writel(0, pdata->ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
281 if (devm_request_irq(&pdev->dev, pdata->irq, mv_rtc_interrupt,
282 IRQF_SHARED,
283 pdev->name, pdata) < 0) {
284 dev_warn(&pdev->dev, "interrupt not available.\n");
285 pdata->irq = -1;
286 }
287 }
288
289 return 0;
290out:
291 if (!IS_ERR(pdata->clk))
292 clk_disable_unprepare(pdata->clk);
293
294 return ret;
295}
296
297static int __exit mv_rtc_remove(struct platform_device *pdev)
298{
299 struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
300
301 if (pdata->irq >= 0)
302 device_init_wakeup(&pdev->dev, 0);
303
304 if (!IS_ERR(pdata->clk))
305 clk_disable_unprepare(pdata->clk);
306
307 return 0;
308}
309
310#ifdef CONFIG_OF
311static const struct of_device_id rtc_mv_of_match_table[] = {
312 { .compatible = "marvell,orion-rtc", },
313 {}
314};
315MODULE_DEVICE_TABLE(of, rtc_mv_of_match_table);
316#endif
317
318static struct platform_driver mv_rtc_driver = {
319 .remove = __exit_p(mv_rtc_remove),
320 .driver = {
321 .name = "rtc-mv",
322 .of_match_table = of_match_ptr(rtc_mv_of_match_table),
323 },
324};
325
326module_platform_driver_probe(mv_rtc_driver, mv_rtc_probe);
327
328MODULE_AUTHOR("Saeed Bishara <saeed@marvell.com>");
329MODULE_DESCRIPTION("Marvell RTC driver");
330MODULE_LICENSE("GPL");
331MODULE_ALIAS("platform:rtc-mv");