2 * Ricoh RP5C01 RTC Driver
4 * Copyright 2009 Geert Uytterhoeven
6 * Based on the A3000 TOD code in arch/m68k/amiga/config.c
7 * Copyright (C) 1993 Hamish Macdonald
11 #include <linux/kernel.h>
12 #include <linux/module.h>
13 #include <linux/platform_device.h>
14 #include <linux/rtc.h>
15 #include <linux/slab.h>
19 RP5C01_1_SECOND
= 0x0, /* MODE 00 */
20 RP5C01_10_SECOND
= 0x1, /* MODE 00 */
21 RP5C01_1_MINUTE
= 0x2, /* MODE 00 and MODE 01 */
22 RP5C01_10_MINUTE
= 0x3, /* MODE 00 and MODE 01 */
23 RP5C01_1_HOUR
= 0x4, /* MODE 00 and MODE 01 */
24 RP5C01_10_HOUR
= 0x5, /* MODE 00 and MODE 01 */
25 RP5C01_DAY_OF_WEEK
= 0x6, /* MODE 00 and MODE 01 */
26 RP5C01_1_DAY
= 0x7, /* MODE 00 and MODE 01 */
27 RP5C01_10_DAY
= 0x8, /* MODE 00 and MODE 01 */
28 RP5C01_1_MONTH
= 0x9, /* MODE 00 */
29 RP5C01_10_MONTH
= 0xa, /* MODE 00 */
30 RP5C01_1_YEAR
= 0xb, /* MODE 00 */
31 RP5C01_10_YEAR
= 0xc, /* MODE 00 */
33 RP5C01_12_24_SELECT
= 0xa, /* MODE 01 */
34 RP5C01_LEAP_YEAR
= 0xb, /* MODE 01 */
36 RP5C01_MODE
= 0xd, /* all modes */
37 RP5C01_TEST
= 0xe, /* all modes */
38 RP5C01_RESET
= 0xf, /* all modes */
41 #define RP5C01_12_24_SELECT_12 (0 << 0)
42 #define RP5C01_12_24_SELECT_24 (1 << 0)
44 #define RP5C01_10_HOUR_AM (0 << 1)
45 #define RP5C01_10_HOUR_PM (1 << 1)
47 #define RP5C01_MODE_TIMER_EN (1 << 3) /* timer enable */
48 #define RP5C01_MODE_ALARM_EN (1 << 2) /* alarm enable */
50 #define RP5C01_MODE_MODE_MASK (3 << 0)
51 #define RP5C01_MODE_MODE00 (0 << 0) /* time */
52 #define RP5C01_MODE_MODE01 (1 << 0) /* alarm, 12h/24h, leap year */
53 #define RP5C01_MODE_RAM_BLOCK10 (2 << 0) /* RAM 4 bits x 13 */
54 #define RP5C01_MODE_RAM_BLOCK11 (3 << 0) /* RAM 4 bits x 13 */
56 #define RP5C01_RESET_1HZ_PULSE (1 << 3)
57 #define RP5C01_RESET_16HZ_PULSE (1 << 2)
58 #define RP5C01_RESET_SECOND (1 << 1) /* reset divider stages for */
59 /* seconds or smaller units */
60 #define RP5C01_RESET_ALARM (1 << 0) /* reset all alarm registers */
65 struct rtc_device
*rtc
;
68 static inline unsigned int rp5c01_read(struct rp5c01_priv
*priv
,
71 return __raw_readl(&priv
->regs
[reg
]) & 0xf;
74 static inline void rp5c01_write(struct rp5c01_priv
*priv
, unsigned int val
,
77 return __raw_writel(val
, &priv
->regs
[reg
]);
80 static void rp5c01_lock(struct rp5c01_priv
*priv
)
82 rp5c01_write(priv
, RP5C01_MODE_MODE00
, RP5C01_MODE
);
85 static void rp5c01_unlock(struct rp5c01_priv
*priv
)
87 rp5c01_write(priv
, RP5C01_MODE_TIMER_EN
| RP5C01_MODE_MODE01
,
91 static int rp5c01_read_time(struct device
*dev
, struct rtc_time
*tm
)
93 struct rp5c01_priv
*priv
= dev_get_drvdata(dev
);
97 tm
->tm_sec
= rp5c01_read(priv
, RP5C01_10_SECOND
) * 10 +
98 rp5c01_read(priv
, RP5C01_1_SECOND
);
99 tm
->tm_min
= rp5c01_read(priv
, RP5C01_10_MINUTE
) * 10 +
100 rp5c01_read(priv
, RP5C01_1_MINUTE
);
101 tm
->tm_hour
= rp5c01_read(priv
, RP5C01_10_HOUR
) * 10 +
102 rp5c01_read(priv
, RP5C01_1_HOUR
);
103 tm
->tm_mday
= rp5c01_read(priv
, RP5C01_10_DAY
) * 10 +
104 rp5c01_read(priv
, RP5C01_1_DAY
);
105 tm
->tm_wday
= rp5c01_read(priv
, RP5C01_DAY_OF_WEEK
);
106 tm
->tm_mon
= rp5c01_read(priv
, RP5C01_10_MONTH
) * 10 +
107 rp5c01_read(priv
, RP5C01_1_MONTH
) - 1;
108 tm
->tm_year
= rp5c01_read(priv
, RP5C01_10_YEAR
) * 10 +
109 rp5c01_read(priv
, RP5C01_1_YEAR
);
110 if (tm
->tm_year
<= 69)
115 return rtc_valid_tm(tm
);
118 static int rp5c01_set_time(struct device
*dev
, struct rtc_time
*tm
)
120 struct rp5c01_priv
*priv
= dev_get_drvdata(dev
);
124 rp5c01_write(priv
, tm
->tm_sec
/ 10, RP5C01_10_SECOND
);
125 rp5c01_write(priv
, tm
->tm_sec
% 10, RP5C01_1_SECOND
);
126 rp5c01_write(priv
, tm
->tm_min
/ 10, RP5C01_10_MINUTE
);
127 rp5c01_write(priv
, tm
->tm_min
% 10, RP5C01_1_MINUTE
);
128 rp5c01_write(priv
, tm
->tm_hour
/ 10, RP5C01_10_HOUR
);
129 rp5c01_write(priv
, tm
->tm_hour
% 10, RP5C01_1_HOUR
);
130 rp5c01_write(priv
, tm
->tm_mday
/ 10, RP5C01_10_DAY
);
131 rp5c01_write(priv
, tm
->tm_mday
% 10, RP5C01_1_DAY
);
132 if (tm
->tm_wday
!= -1)
133 rp5c01_write(priv
, tm
->tm_wday
, RP5C01_DAY_OF_WEEK
);
134 rp5c01_write(priv
, (tm
->tm_mon
+ 1) / 10, RP5C01_10_MONTH
);
135 rp5c01_write(priv
, (tm
->tm_mon
+ 1) % 10, RP5C01_1_MONTH
);
136 if (tm
->tm_year
>= 100)
138 rp5c01_write(priv
, tm
->tm_year
/ 10, RP5C01_10_YEAR
);
139 rp5c01_write(priv
, tm
->tm_year
% 10, RP5C01_1_YEAR
);
145 static const struct rtc_class_ops rp5c01_rtc_ops
= {
146 .read_time
= rp5c01_read_time
,
147 .set_time
= rp5c01_set_time
,
150 static int __init
rp5c01_rtc_probe(struct platform_device
*dev
)
152 struct resource
*res
;
153 struct rp5c01_priv
*priv
;
154 struct rtc_device
*rtc
;
157 res
= platform_get_resource(dev
, IORESOURCE_MEM
, 0);
161 priv
= kzalloc(sizeof(*priv
), GFP_KERNEL
);
165 priv
->regs
= ioremap(res
->start
, resource_size(res
));
171 rtc
= rtc_device_register("rtc-rp5c01", &dev
->dev
, &rp5c01_rtc_ops
,
174 error
= PTR_ERR(rtc
);
179 platform_set_drvdata(dev
, priv
);
189 static int __exit
rp5c01_rtc_remove(struct platform_device
*dev
)
191 struct rp5c01_priv
*priv
= platform_get_drvdata(dev
);
193 rtc_device_unregister(priv
->rtc
);
199 static struct platform_driver rp5c01_rtc_driver
= {
201 .name
= "rtc-rp5c01",
202 .owner
= THIS_MODULE
,
204 .remove
= __exit_p(rp5c01_rtc_remove
),
207 static int __init
rp5c01_rtc_init(void)
209 return platform_driver_probe(&rp5c01_rtc_driver
, rp5c01_rtc_probe
);
212 static void __exit
rp5c01_rtc_fini(void)
214 platform_driver_unregister(&rp5c01_rtc_driver
);
217 module_init(rp5c01_rtc_init
);
218 module_exit(rp5c01_rtc_fini
);
220 MODULE_AUTHOR("Geert Uytterhoeven <geert@linux-m68k.org>");
221 MODULE_LICENSE("GPL");
222 MODULE_DESCRIPTION("Ricoh RP5C01 RTC driver");
223 MODULE_ALIAS("platform:rtc-rp5c01");