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Saeed Bisharadefb4512009-01-06 14:42:24 -08001/*
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>
Nicolas Pitre9d1d4f92009-03-23 20:42:29 -040015#include <linux/delay.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090016#include <linux/gfp.h>
Paul Gortmaker21138522011-05-27 09:57:25 -040017#include <linux/module.h>
Saeed Bisharadefb4512009-01-06 14:42:24 -080018
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 (1 << 22) /* 12 hours 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
Saeed Bisharaaeedaca2009-12-15 16:46:08 -080032#define RTC_ALARM_TIME_REG_OFFS 8
33#define RTC_ALARM_DATE_REG_OFFS 0xc
34#define RTC_ALARM_VALID (1 << 7)
35
36#define RTC_ALARM_INTERRUPT_MASK_REG_OFFS 0x10
37#define RTC_ALARM_INTERRUPT_CASUE_REG_OFFS 0x14
Saeed Bisharadefb4512009-01-06 14:42:24 -080038
39struct rtc_plat_data {
40 struct rtc_device *rtc;
41 void __iomem *ioaddr;
Saeed Bisharaaeedaca2009-12-15 16:46:08 -080042 int irq;
Saeed Bisharadefb4512009-01-06 14:42:24 -080043};
44
45static int mv_rtc_set_time(struct device *dev, struct rtc_time *tm)
46{
47 struct rtc_plat_data *pdata = dev_get_drvdata(dev);
48 void __iomem *ioaddr = pdata->ioaddr;
49 u32 rtc_reg;
50
51 rtc_reg = (bin2bcd(tm->tm_sec) << RTC_SECONDS_OFFS) |
52 (bin2bcd(tm->tm_min) << RTC_MINUTES_OFFS) |
53 (bin2bcd(tm->tm_hour) << RTC_HOURS_OFFS) |
54 (bin2bcd(tm->tm_wday) << RTC_WDAY_OFFS);
55 writel(rtc_reg, ioaddr + RTC_TIME_REG_OFFS);
56
57 rtc_reg = (bin2bcd(tm->tm_mday) << RTC_MDAY_OFFS) |
58 (bin2bcd(tm->tm_mon + 1) << RTC_MONTH_OFFS) |
59 (bin2bcd(tm->tm_year % 100) << RTC_YEAR_OFFS);
60 writel(rtc_reg, ioaddr + RTC_DATE_REG_OFFS);
61
62 return 0;
63}
64
65static int mv_rtc_read_time(struct device *dev, struct rtc_time *tm)
66{
67 struct rtc_plat_data *pdata = dev_get_drvdata(dev);
68 void __iomem *ioaddr = pdata->ioaddr;
69 u32 rtc_time, rtc_date;
70 unsigned int year, month, day, hour, minute, second, wday;
71
72 rtc_time = readl(ioaddr + RTC_TIME_REG_OFFS);
73 rtc_date = readl(ioaddr + RTC_DATE_REG_OFFS);
74
75 second = rtc_time & 0x7f;
76 minute = (rtc_time >> RTC_MINUTES_OFFS) & 0x7f;
77 hour = (rtc_time >> RTC_HOURS_OFFS) & 0x3f; /* assume 24 hours mode */
78 wday = (rtc_time >> RTC_WDAY_OFFS) & 0x7;
79
80 day = rtc_date & 0x3f;
81 month = (rtc_date >> RTC_MONTH_OFFS) & 0x3f;
82 year = (rtc_date >> RTC_YEAR_OFFS) & 0xff;
83
84 tm->tm_sec = bcd2bin(second);
85 tm->tm_min = bcd2bin(minute);
86 tm->tm_hour = bcd2bin(hour);
87 tm->tm_mday = bcd2bin(day);
88 tm->tm_wday = bcd2bin(wday);
89 tm->tm_mon = bcd2bin(month) - 1;
90 /* hw counts from year 2000, but tm_year is relative to 1900 */
91 tm->tm_year = bcd2bin(year) + 100;
92
93 return rtc_valid_tm(tm);
94}
95
Saeed Bisharaaeedaca2009-12-15 16:46:08 -080096static int mv_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
97{
98 struct rtc_plat_data *pdata = dev_get_drvdata(dev);
99 void __iomem *ioaddr = pdata->ioaddr;
100 u32 rtc_time, rtc_date;
101 unsigned int year, month, day, hour, minute, second, wday;
102
103 rtc_time = readl(ioaddr + RTC_ALARM_TIME_REG_OFFS);
104 rtc_date = readl(ioaddr + RTC_ALARM_DATE_REG_OFFS);
105
106 second = rtc_time & 0x7f;
107 minute = (rtc_time >> RTC_MINUTES_OFFS) & 0x7f;
108 hour = (rtc_time >> RTC_HOURS_OFFS) & 0x3f; /* assume 24 hours mode */
109 wday = (rtc_time >> RTC_WDAY_OFFS) & 0x7;
110
111 day = rtc_date & 0x3f;
112 month = (rtc_date >> RTC_MONTH_OFFS) & 0x3f;
113 year = (rtc_date >> RTC_YEAR_OFFS) & 0xff;
114
115 alm->time.tm_sec = bcd2bin(second);
116 alm->time.tm_min = bcd2bin(minute);
117 alm->time.tm_hour = bcd2bin(hour);
118 alm->time.tm_mday = bcd2bin(day);
119 alm->time.tm_wday = bcd2bin(wday);
120 alm->time.tm_mon = bcd2bin(month) - 1;
121 /* hw counts from year 2000, but tm_year is relative to 1900 */
122 alm->time.tm_year = bcd2bin(year) + 100;
123
124 if (rtc_valid_tm(&alm->time) < 0) {
125 dev_err(dev, "retrieved alarm date/time is not valid.\n");
126 rtc_time_to_tm(0, &alm->time);
127 }
128
129 alm->enabled = !!readl(ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
130 return 0;
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
John Stultz16380c12011-02-02 17:02:41 -0800173static int mv_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
Saeed Bisharaaeedaca2009-12-15 16:46:08 -0800174{
175 struct platform_device *pdev = to_platform_device(dev);
176 struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
177 void __iomem *ioaddr = pdata->ioaddr;
178
179 if (pdata->irq < 0)
John Stultz16380c12011-02-02 17:02:41 -0800180 return -EINVAL; /* fall back into rtc-dev's emulation */
181
182 if (enabled)
Saeed Bisharaaeedaca2009-12-15 16:46:08 -0800183 writel(1, ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
John Stultz16380c12011-02-02 17:02:41 -0800184 else
185 writel(0, ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
Saeed Bisharaaeedaca2009-12-15 16:46:08 -0800186 return 0;
187}
188
189static irqreturn_t mv_rtc_interrupt(int irq, void *data)
190{
191 struct rtc_plat_data *pdata = data;
192 void __iomem *ioaddr = pdata->ioaddr;
193
194 /* alarm irq? */
195 if (!readl(ioaddr + RTC_ALARM_INTERRUPT_CASUE_REG_OFFS))
196 return IRQ_NONE;
197
198 /* clear interrupt */
199 writel(0, ioaddr + RTC_ALARM_INTERRUPT_CASUE_REG_OFFS);
200 rtc_update_irq(pdata->rtc, 1, RTC_IRQF | RTC_AF);
201 return IRQ_HANDLED;
202}
203
Saeed Bisharadefb4512009-01-06 14:42:24 -0800204static const struct rtc_class_ops mv_rtc_ops = {
205 .read_time = mv_rtc_read_time,
206 .set_time = mv_rtc_set_time,
207};
208
Saeed Bisharaaeedaca2009-12-15 16:46:08 -0800209static const struct rtc_class_ops mv_rtc_alarm_ops = {
210 .read_time = mv_rtc_read_time,
211 .set_time = mv_rtc_set_time,
212 .read_alarm = mv_rtc_read_alarm,
213 .set_alarm = mv_rtc_set_alarm,
John Stultz16380c12011-02-02 17:02:41 -0800214 .alarm_irq_enable = mv_rtc_alarm_irq_enable,
Saeed Bisharaaeedaca2009-12-15 16:46:08 -0800215};
216
217static int __devinit mv_rtc_probe(struct platform_device *pdev)
Saeed Bisharadefb4512009-01-06 14:42:24 -0800218{
219 struct resource *res;
220 struct rtc_plat_data *pdata;
221 resource_size_t size;
222 u32 rtc_time;
223
224 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
225 if (!res)
226 return -ENODEV;
227
228 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
229 if (!pdata)
230 return -ENOMEM;
231
232 size = resource_size(res);
233 if (!devm_request_mem_region(&pdev->dev, res->start, size,
234 pdev->name))
235 return -EBUSY;
236
237 pdata->ioaddr = devm_ioremap(&pdev->dev, res->start, size);
238 if (!pdata->ioaddr)
239 return -ENOMEM;
240
241 /* make sure the 24 hours mode is enabled */
242 rtc_time = readl(pdata->ioaddr + RTC_TIME_REG_OFFS);
243 if (rtc_time & RTC_HOURS_12H_MODE) {
244 dev_err(&pdev->dev, "24 Hours mode not supported.\n");
245 return -EINVAL;
246 }
247
Nicolas Pitre9d1d4f92009-03-23 20:42:29 -0400248 /* make sure it is actually functional */
249 if (rtc_time == 0x01000000) {
250 ssleep(1);
251 rtc_time = readl(pdata->ioaddr + RTC_TIME_REG_OFFS);
252 if (rtc_time == 0x01000000) {
253 dev_err(&pdev->dev, "internal RTC not ticking\n");
254 return -ENODEV;
255 }
256 }
257
Saeed Bisharaaeedaca2009-12-15 16:46:08 -0800258 pdata->irq = platform_get_irq(pdev, 0);
259
Saeed Bisharadefb4512009-01-06 14:42:24 -0800260 platform_set_drvdata(pdev, pdata);
Saeed Bisharaaeedaca2009-12-15 16:46:08 -0800261
262 if (pdata->irq >= 0) {
263 device_init_wakeup(&pdev->dev, 1);
264 pdata->rtc = rtc_device_register(pdev->name, &pdev->dev,
265 &mv_rtc_alarm_ops,
266 THIS_MODULE);
267 } else
268 pdata->rtc = rtc_device_register(pdev->name, &pdev->dev,
269 &mv_rtc_ops, THIS_MODULE);
Saeed Bisharadefb4512009-01-06 14:42:24 -0800270 if (IS_ERR(pdata->rtc))
271 return PTR_ERR(pdata->rtc);
272
Saeed Bisharaaeedaca2009-12-15 16:46:08 -0800273 if (pdata->irq >= 0) {
274 writel(0, pdata->ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
275 if (devm_request_irq(&pdev->dev, pdata->irq, mv_rtc_interrupt,
276 IRQF_DISABLED | IRQF_SHARED,
277 pdev->name, pdata) < 0) {
278 dev_warn(&pdev->dev, "interrupt not available.\n");
279 pdata->irq = -1;
280 }
281 }
282
Saeed Bisharadefb4512009-01-06 14:42:24 -0800283 return 0;
284}
285
286static int __exit mv_rtc_remove(struct platform_device *pdev)
287{
288 struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
289
Saeed Bisharaaeedaca2009-12-15 16:46:08 -0800290 if (pdata->irq >= 0)
291 device_init_wakeup(&pdev->dev, 0);
292
Saeed Bisharadefb4512009-01-06 14:42:24 -0800293 rtc_device_unregister(pdata->rtc);
294 return 0;
295}
296
297static struct platform_driver mv_rtc_driver = {
298 .remove = __exit_p(mv_rtc_remove),
299 .driver = {
300 .name = "rtc-mv",
301 .owner = THIS_MODULE,
302 },
303};
304
305static __init int mv_init(void)
306{
307 return platform_driver_probe(&mv_rtc_driver, mv_rtc_probe);
308}
309
310static __exit void mv_exit(void)
311{
312 platform_driver_unregister(&mv_rtc_driver);
313}
314
315module_init(mv_init);
316module_exit(mv_exit);
317
318MODULE_AUTHOR("Saeed Bishara <saeed@marvell.com>");
319MODULE_DESCRIPTION("Marvell RTC driver");
320MODULE_LICENSE("GPL");
321MODULE_ALIAS("platform:rtc-mv");