Root/target/linux/generic/patches-2.6.38/840-rtc7301.patch

1--- a/drivers/rtc/Kconfig
2+++ b/drivers/rtc/Kconfig
3@@ -677,6 +677,15 @@ config RTC_DRV_NUC900
4       If you say yes here you get support for the RTC subsystem of the
5       NUC910/NUC920 used in embedded systems.
6 
7+config RTC_DRV_RTC7301
8+ tristate "Epson RTC-7301 SF/DG"
9+ help
10+ If you say Y here you will get support for the
11+ Epson RTC-7301 SF/DG RTC chips.
12+
13+ This driver can also be built as a module. If so, the module
14+ will be called rtc-7301.
15+
16 comment "on-CPU RTC drivers"
17 
18 config RTC_DRV_DAVINCI
19--- a/drivers/rtc/Makefile
20+++ b/drivers/rtc/Makefile
21@@ -83,6 +83,7 @@ obj-$(CONFIG_RTC_DRV_RP5C01) += rtc-rp5c
22 obj-$(CONFIG_RTC_DRV_RS5C313) += rtc-rs5c313.o
23 obj-$(CONFIG_RTC_DRV_RS5C348) += rtc-rs5c348.o
24 obj-$(CONFIG_RTC_DRV_RS5C372) += rtc-rs5c372.o
25+obj-$(CONFIG_RTC_DRV_RTC7301) += rtc-rtc7301.o
26 obj-$(CONFIG_RTC_DRV_RX8025) += rtc-rx8025.o
27 obj-$(CONFIG_RTC_DRV_RX8581) += rtc-rx8581.o
28 obj-$(CONFIG_RTC_DRV_S35390A) += rtc-s35390a.o
29--- /dev/null
30+++ b/drivers/rtc/rtc-rtc7301.c
31@@ -0,0 +1,219 @@
32+/*
33+ * Driver for Epson RTC-7301SF/DG
34+ *
35+ * Copyright (C) 2009 Jose Vasconcellos
36+ *
37+ * This program is free software; you can redistribute it and/or modify
38+ * it under the terms of the GNU General Public License version 2 as
39+ * published by the Free Software Foundation.
40+ */
41+
42+#include <linux/module.h>
43+#include <linux/rtc.h>
44+#include <linux/platform_device.h>
45+#include <linux/io.h>
46+#include <linux/delay.h>
47+#include <linux/bcd.h>
48+
49+#define RTC_NAME "rtc7301"
50+#define RTC_VERSION "0.1"
51+
52+/* Epson RTC-7301 register addresses */
53+#define RTC7301_SEC 0x00
54+#define RTC7301_SEC10 0x01
55+#define RTC7301_MIN 0x02
56+#define RTC7301_MIN10 0x03
57+#define RTC7301_HOUR 0x04
58+#define RTC7301_HOUR10 0x05
59+#define RTC7301_WEEKDAY 0x06
60+#define RTC7301_DAY 0x07
61+#define RTC7301_DAY10 0x08
62+#define RTC7301_MON 0x09
63+#define RTC7301_MON10 0x0A
64+#define RTC7301_YEAR 0x0B
65+#define RTC7301_YEAR10 0x0C
66+#define RTC7301_YEAR100 0x0D
67+#define RTC7301_YEAR1000 0x0E
68+#define RTC7301_CTRLREG 0x0F
69+
70+static uint8_t __iomem *rtc7301_base;
71+
72+#define read_reg(offset) (readb(rtc7301_base + offset) & 0xf)
73+#define write_reg(offset, data) writeb(data, rtc7301_base + (offset))
74+
75+#define rtc7301_isbusy() (read_reg(RTC7301_CTRLREG) & 1)
76+
77+static void rtc7301_init_settings(void)
78+{
79+ int i;
80+
81+ write_reg(RTC7301_CTRLREG, 2);
82+ write_reg(RTC7301_YEAR1000, 2);
83+ udelay(122);
84+
85+ /* bank 1 */
86+ write_reg(RTC7301_CTRLREG, 6);
87+ for (i=0; i<15; i++)
88+ write_reg(i, 0);
89+
90+ /* bank 2 */
91+ write_reg(RTC7301_CTRLREG, 14);
92+ for (i=0; i<15; i++)
93+ write_reg(i, 0);
94+ write_reg(RTC7301_CTRLREG, 0);
95+}
96+
97+static int rtc7301_get_datetime(struct device *dev, struct rtc_time *dt)
98+{
99+ int cnt;
100+ uint8_t buf[16];
101+
102+ cnt = 0;
103+ while (rtc7301_isbusy()) {
104+ udelay(244);
105+ if (cnt++ > 100) {
106+ dev_err(dev, "%s: timeout error %x\n", __func__, rtc7301_base[RTC7301_CTRLREG]);
107+ return -EIO;
108+ }
109+ }
110+
111+ for (cnt=0; cnt<16; cnt++)
112+ buf[cnt] = read_reg(cnt);
113+
114+ if (buf[RTC7301_SEC10] & 8) {
115+ dev_err(dev, "%s: RTC not set\n", __func__);
116+ return -EINVAL;
117+ }
118+
119+ memset(dt, 0, sizeof(*dt));
120+
121+ dt->tm_sec = buf[RTC7301_SEC] + buf[RTC7301_SEC10]*10;
122+ dt->tm_min = buf[RTC7301_MIN] + buf[RTC7301_MIN10]*10;
123+ dt->tm_hour = buf[RTC7301_HOUR] + buf[RTC7301_HOUR10]*10;
124+
125+ dt->tm_mday = buf[RTC7301_DAY] + buf[RTC7301_DAY10]*10;
126+ dt->tm_mon = buf[RTC7301_MON] + buf[RTC7301_MON10]*10 - 1;
127+ dt->tm_year = buf[RTC7301_YEAR] + buf[RTC7301_YEAR10]*10 +
128+ buf[RTC7301_YEAR100]*100 +
129+ ((buf[RTC7301_YEAR1000] & 3)*1000) - 1900;
130+
131+ /* the rtc device may contain illegal values on power up
132+ * according to the data sheet. make sure they are valid.
133+ */
134+
135+ return rtc_valid_tm(dt);
136+}
137+
138+static int rtc7301_set_datetime(struct device *dev, struct rtc_time *dt)
139+{
140+ int data;
141+
142+ data = dt->tm_year + 1900;
143+ if (data >= 2100 || data < 1900)
144+ return -EINVAL;
145+
146+ write_reg(RTC7301_CTRLREG, 2);
147+ udelay(122);
148+
149+ data = bin2bcd(dt->tm_sec);
150+ write_reg(RTC7301_SEC, data);
151+ write_reg(RTC7301_SEC10, (data >> 4));
152+
153+ data = bin2bcd(dt->tm_min);
154+ write_reg(RTC7301_MIN, data );
155+ write_reg(RTC7301_MIN10, (data >> 4));
156+
157+ data = bin2bcd(dt->tm_hour);
158+ write_reg(RTC7301_HOUR, data);
159+ write_reg(RTC7301_HOUR10, (data >> 4));
160+
161+ data = bin2bcd(dt->tm_mday);
162+ write_reg(RTC7301_DAY, data);
163+ write_reg(RTC7301_DAY10, (data>> 4));
164+
165+ data = bin2bcd(dt->tm_mon + 1);
166+ write_reg(RTC7301_MON, data);
167+ write_reg(RTC7301_MON10, (data >> 4));
168+
169+ data = bin2bcd(dt->tm_year % 100);
170+ write_reg(RTC7301_YEAR, data);
171+ write_reg(RTC7301_YEAR10, (data >> 4));
172+ data = bin2bcd((1900 + dt->tm_year) / 100);
173+ write_reg(RTC7301_YEAR100, data);
174+
175+ data = bin2bcd(dt->tm_wday);
176+ write_reg(RTC7301_WEEKDAY, data);
177+
178+ write_reg(RTC7301_CTRLREG, 0);
179+
180+ return 0;
181+}
182+
183+static const struct rtc_class_ops rtc7301_rtc_ops = {
184+ .read_time = rtc7301_get_datetime,
185+ .set_time = rtc7301_set_datetime,
186+};
187+
188+static int __devinit rtc7301_probe(struct platform_device *pdev)
189+{
190+ struct rtc_device *rtc;
191+ struct resource *res;
192+
193+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
194+ if (!res)
195+ return -ENOENT;
196+
197+ rtc7301_base = ioremap_nocache(res->start, 0x1000 /*res->end - res->start + 1*/);
198+ if (!rtc7301_base)
199+ return -EINVAL;
200+
201+ rtc = rtc_device_register(RTC_NAME, &pdev->dev,
202+ &rtc7301_rtc_ops, THIS_MODULE);
203+ if (IS_ERR(rtc)) {
204+ iounmap(rtc7301_base);
205+ return PTR_ERR(rtc);
206+ }
207+
208+ platform_set_drvdata(pdev, rtc);
209+
210+ rtc7301_init_settings();
211+ return 0;
212+}
213+
214+static int __devexit rtc7301_remove(struct platform_device *pdev)
215+{
216+ struct rtc_device *rtc = platform_get_drvdata(pdev);
217+
218+ if (rtc)
219+ rtc_device_unregister(rtc);
220+ if (rtc7301_base)
221+ iounmap(rtc7301_base);
222+ return 0;
223+}
224+
225+static struct platform_driver rtc7301_driver = {
226+ .driver = {
227+ .name = RTC_NAME,
228+ .owner = THIS_MODULE,
229+ },
230+ .probe = rtc7301_probe,
231+ .remove = __devexit_p(rtc7301_remove),
232+};
233+
234+static __init int rtc7301_init(void)
235+{
236+ return platform_driver_register(&rtc7301_driver);
237+}
238+module_init(rtc7301_init);
239+
240+static __exit void rtc7301_exit(void)
241+{
242+ platform_driver_unregister(&rtc7301_driver);
243+}
244+module_exit(rtc7301_exit);
245+
246+MODULE_DESCRIPTION("Epson 7301 RTC driver");
247+MODULE_AUTHOR("Jose Vasconcellos <jvasco@verizon.net>");
248+MODULE_LICENSE("GPL");
249+MODULE_ALIAS("platform:" RTC_NAME);
250+MODULE_VERSION(RTC_VERSION);
251

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