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1 | /* |
2 | * Dallas DS1302 RTC Support |
3 | * |
4 | * Copyright (C) 2002 David McCullough |
5 | * Copyright (C) 2003 - 2007 Paul Mundt |
6 | * |
7 | * This file is subject to the terms and conditions of the GNU General Public |
8 | * License version 2. See the file "COPYING" in the main directory of |
9 | * this archive for more details. |
10 | */ |
11 | |
12 | #include <linux/init.h> |
13 | #include <linux/module.h> |
14 | #include <linux/kernel.h> |
15 | #include <linux/platform_device.h> |
16 | #include <linux/rtc.h> |
17 | #include <linux/io.h> |
18 | #include <linux/bcd.h> |
19 | #include <asm/rtc.h> |
20 | |
21 | #define DRV_NAME "rtc-ds1302" |
22 | #define DRV_VERSION "0.1.1" |
23 | |
24 | #define RTC_CMD_READ 0x81 /* Read command */ |
25 | #define RTC_CMD_WRITE 0x80 /* Write command */ |
26 | |
27 | #define RTC_ADDR_RAM0 0x20 /* Address of RAM0 */ |
28 | #define RTC_ADDR_TCR 0x08 /* Address of trickle charge register */ |
29 | #define RTC_ADDR_YEAR 0x06 /* Address of year register */ |
30 | #define RTC_ADDR_DAY 0x05 /* Address of day of week register */ |
31 | #define RTC_ADDR_MON 0x04 /* Address of month register */ |
32 | #define RTC_ADDR_DATE 0x03 /* Address of day of month register */ |
33 | #define RTC_ADDR_HOUR 0x02 /* Address of hour register */ |
34 | #define RTC_ADDR_MIN 0x01 /* Address of minute register */ |
35 | #define RTC_ADDR_SEC 0x00 /* Address of second register */ |
36 | |
37 | #define RTC_RESET 0x1000 |
38 | #define RTC_IODATA 0x0800 |
39 | #define RTC_SCLK 0x0400 |
40 | |
41 | #ifdef CONFIG_SH_SECUREEDGE5410 |
42 | #include <mach/snapgear.h> |
43 | #define set_dp(x) SECUREEDGE_WRITE_IOPORT(x, 0x1c00) |
44 | #define get_dp() SECUREEDGE_READ_IOPORT() |
45 | #else |
46 | #error "Add support for your platform" |
47 | #endif |
48 | |
49 | static void ds1302_sendbits(unsigned int val) |
50 | { |
51 | int i; |
52 | |
53 | for (i = 8; (i); i--, val >>= 1) { |
54 | set_dp((get_dp() & ~RTC_IODATA) | ((val & 0x1) ? |
55 | RTC_IODATA : 0)); |
56 | set_dp(get_dp() | RTC_SCLK); /* clock high */ |
57 | set_dp(get_dp() & ~RTC_SCLK); /* clock low */ |
58 | } |
59 | } |
60 | |
61 | static unsigned int ds1302_recvbits(void) |
62 | { |
63 | unsigned int val; |
64 | int i; |
65 | |
66 | for (i = 0, val = 0; (i < 8); i++) { |
67 | val |= (((get_dp() & RTC_IODATA) ? 1 : 0) << i); |
68 | set_dp(get_dp() | RTC_SCLK); /* clock high */ |
69 | set_dp(get_dp() & ~RTC_SCLK); /* clock low */ |
70 | } |
71 | |
72 | return val; |
73 | } |
74 | |
75 | static unsigned int ds1302_readbyte(unsigned int addr) |
76 | { |
77 | unsigned int val; |
78 | |
79 | set_dp(get_dp() & ~(RTC_RESET | RTC_IODATA | RTC_SCLK)); |
80 | |
81 | set_dp(get_dp() | RTC_RESET); |
82 | ds1302_sendbits(((addr & 0x3f) << 1) | RTC_CMD_READ); |
83 | val = ds1302_recvbits(); |
84 | set_dp(get_dp() & ~RTC_RESET); |
85 | |
86 | return val; |
87 | } |
88 | |
89 | static void ds1302_writebyte(unsigned int addr, unsigned int val) |
90 | { |
91 | set_dp(get_dp() & ~(RTC_RESET | RTC_IODATA | RTC_SCLK)); |
92 | set_dp(get_dp() | RTC_RESET); |
93 | ds1302_sendbits(((addr & 0x3f) << 1) | RTC_CMD_WRITE); |
94 | ds1302_sendbits(val); |
95 | set_dp(get_dp() & ~RTC_RESET); |
96 | } |
97 | |
98 | static int ds1302_rtc_read_time(struct device *dev, struct rtc_time *tm) |
99 | { |
100 | tm->tm_sec = bcd2bin(ds1302_readbyte(RTC_ADDR_SEC)); |
101 | tm->tm_min = bcd2bin(ds1302_readbyte(RTC_ADDR_MIN)); |
102 | tm->tm_hour = bcd2bin(ds1302_readbyte(RTC_ADDR_HOUR)); |
103 | tm->tm_wday = bcd2bin(ds1302_readbyte(RTC_ADDR_DAY)); |
104 | tm->tm_mday = bcd2bin(ds1302_readbyte(RTC_ADDR_DATE)); |
105 | tm->tm_mon = bcd2bin(ds1302_readbyte(RTC_ADDR_MON)) - 1; |
106 | tm->tm_year = bcd2bin(ds1302_readbyte(RTC_ADDR_YEAR)); |
107 | |
108 | if (tm->tm_year < 70) |
109 | tm->tm_year += 100; |
110 | |
111 | dev_dbg(dev, "%s: tm is secs=%d, mins=%d, hours=%d, " |
112 | "mday=%d, mon=%d, year=%d, wday=%d\n", |
113 | __func__, |
114 | tm->tm_sec, tm->tm_min, tm->tm_hour, |
115 | tm->tm_mday, tm->tm_mon + 1, tm->tm_year, tm->tm_wday); |
116 | |
117 | return rtc_valid_tm(tm); |
118 | } |
119 | |
120 | static int ds1302_rtc_set_time(struct device *dev, struct rtc_time *tm) |
121 | { |
122 | /* Stop RTC */ |
123 | ds1302_writebyte(RTC_ADDR_SEC, ds1302_readbyte(RTC_ADDR_SEC) | 0x80); |
124 | |
125 | ds1302_writebyte(RTC_ADDR_SEC, bin2bcd(tm->tm_sec)); |
126 | ds1302_writebyte(RTC_ADDR_MIN, bin2bcd(tm->tm_min)); |
127 | ds1302_writebyte(RTC_ADDR_HOUR, bin2bcd(tm->tm_hour)); |
128 | ds1302_writebyte(RTC_ADDR_DAY, bin2bcd(tm->tm_wday)); |
129 | ds1302_writebyte(RTC_ADDR_DATE, bin2bcd(tm->tm_mday)); |
130 | ds1302_writebyte(RTC_ADDR_MON, bin2bcd(tm->tm_mon + 1)); |
131 | ds1302_writebyte(RTC_ADDR_YEAR, bin2bcd(tm->tm_year % 100)); |
132 | |
133 | /* Start RTC */ |
134 | ds1302_writebyte(RTC_ADDR_SEC, ds1302_readbyte(RTC_ADDR_SEC) & ~0x80); |
135 | |
136 | return 0; |
137 | } |
138 | |
139 | static int ds1302_rtc_ioctl(struct device *dev, unsigned int cmd, |
140 | unsigned long arg) |
141 | { |
142 | switch (cmd) { |
143 | #ifdef RTC_SET_CHARGE |
144 | case RTC_SET_CHARGE: |
145 | { |
146 | int tcs_val; |
147 | |
148 | if (copy_from_user(&tcs_val, (int __user *)arg, sizeof(int))) |
149 | return -EFAULT; |
150 | |
151 | ds1302_writebyte(RTC_ADDR_TCR, (0xa0 | tcs_val * 0xf)); |
152 | return 0; |
153 | } |
154 | #endif |
155 | } |
156 | |
157 | return -ENOIOCTLCMD; |
158 | } |
159 | |
160 | static struct rtc_class_ops ds1302_rtc_ops = { |
161 | .read_time = ds1302_rtc_read_time, |
162 | .set_time = ds1302_rtc_set_time, |
163 | .ioctl = ds1302_rtc_ioctl, |
164 | }; |
165 | |
166 | static int __init ds1302_rtc_probe(struct platform_device *pdev) |
167 | { |
168 | struct rtc_device *rtc; |
169 | |
170 | /* Reset */ |
171 | set_dp(get_dp() & ~(RTC_RESET | RTC_IODATA | RTC_SCLK)); |
172 | |
173 | /* Write a magic value to the DS1302 RAM, and see if it sticks. */ |
174 | ds1302_writebyte(RTC_ADDR_RAM0, 0x42); |
175 | if (ds1302_readbyte(RTC_ADDR_RAM0) != 0x42) |
176 | return -ENODEV; |
177 | |
178 | rtc = rtc_device_register("ds1302", &pdev->dev, |
179 | &ds1302_rtc_ops, THIS_MODULE); |
180 | if (IS_ERR(rtc)) |
181 | return PTR_ERR(rtc); |
182 | |
183 | platform_set_drvdata(pdev, rtc); |
184 | |
185 | return 0; |
186 | } |
187 | |
188 | static int __devexit ds1302_rtc_remove(struct platform_device *pdev) |
189 | { |
190 | struct rtc_device *rtc = platform_get_drvdata(pdev); |
191 | |
192 | rtc_device_unregister(rtc); |
193 | platform_set_drvdata(pdev, NULL); |
194 | |
195 | return 0; |
196 | } |
197 | |
198 | static struct platform_driver ds1302_platform_driver = { |
199 | .driver = { |
200 | .name = DRV_NAME, |
201 | .owner = THIS_MODULE, |
202 | }, |
203 | .remove = __devexit_p(ds1302_rtc_remove), |
204 | }; |
205 | |
206 | static int __init ds1302_rtc_init(void) |
207 | { |
208 | return platform_driver_probe(&ds1302_platform_driver, ds1302_rtc_probe); |
209 | } |
210 | |
211 | static void __exit ds1302_rtc_exit(void) |
212 | { |
213 | platform_driver_unregister(&ds1302_platform_driver); |
214 | } |
215 | |
216 | module_init(ds1302_rtc_init); |
217 | module_exit(ds1302_rtc_exit); |
218 | |
219 | MODULE_DESCRIPTION("Dallas DS1302 RTC driver"); |
220 | MODULE_VERSION(DRV_VERSION); |
221 | MODULE_AUTHOR("Paul Mundt, David McCullough"); |
222 | MODULE_LICENSE("GPL v2"); |
223 |
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