251 lines
6.2 KiB
Diff
251 lines
6.2 KiB
Diff
--- a/drivers/rtc/Kconfig
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+++ b/drivers/rtc/Kconfig
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@@ -841,6 +841,15 @@ config RTC_DRV_NUC900
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If you say yes here you get support for the RTC subsystem of the
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NUC910/NUC920 used in embedded systems.
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+config RTC_DRV_RTC7301
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+ tristate "Epson RTC-7301 SF/DG"
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+ help
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+ If you say Y here you will get support for the
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+ Epson RTC-7301 SF/DG RTC chips.
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+
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+ This driver can also be built as a module. If so, the module
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+ will be called rtc-7301.
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+
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comment "on-CPU RTC drivers"
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config RTC_DRV_DAVINCI
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--- a/drivers/rtc/Makefile
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+++ b/drivers/rtc/Makefile
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@@ -100,6 +100,7 @@ obj-$(CONFIG_RTC_DRV_RP5C01) += rtc-rp5c
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obj-$(CONFIG_RTC_DRV_RS5C313) += rtc-rs5c313.o
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obj-$(CONFIG_RTC_DRV_RS5C348) += rtc-rs5c348.o
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obj-$(CONFIG_RTC_DRV_RS5C372) += rtc-rs5c372.o
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+obj-$(CONFIG_RTC_DRV_RTC7301) += rtc-rtc7301.o
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obj-$(CONFIG_RTC_DRV_RV3029C2) += rtc-rv3029c2.o
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obj-$(CONFIG_RTC_DRV_RX4581) += rtc-rx4581.o
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obj-$(CONFIG_RTC_DRV_RX8025) += rtc-rx8025.o
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--- /dev/null
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+++ b/drivers/rtc/rtc-rtc7301.c
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@@ -0,0 +1,219 @@
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+/*
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+ * Driver for Epson RTC-7301SF/DG
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+ *
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+ * Copyright (C) 2009 Jose Vasconcellos
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2 as
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+ * published by the Free Software Foundation.
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+ */
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+
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+#include <linux/module.h>
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+#include <linux/rtc.h>
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+#include <linux/platform_device.h>
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+#include <linux/io.h>
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+#include <linux/delay.h>
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+#include <linux/bcd.h>
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+
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+#define RTC_NAME "rtc7301"
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+#define RTC_VERSION "0.1"
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+
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+/* Epson RTC-7301 register addresses */
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+#define RTC7301_SEC 0x00
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+#define RTC7301_SEC10 0x01
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+#define RTC7301_MIN 0x02
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+#define RTC7301_MIN10 0x03
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+#define RTC7301_HOUR 0x04
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+#define RTC7301_HOUR10 0x05
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+#define RTC7301_WEEKDAY 0x06
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+#define RTC7301_DAY 0x07
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+#define RTC7301_DAY10 0x08
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+#define RTC7301_MON 0x09
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+#define RTC7301_MON10 0x0A
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+#define RTC7301_YEAR 0x0B
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+#define RTC7301_YEAR10 0x0C
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+#define RTC7301_YEAR100 0x0D
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+#define RTC7301_YEAR1000 0x0E
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+#define RTC7301_CTRLREG 0x0F
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+
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+static uint8_t __iomem *rtc7301_base;
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+
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+#define read_reg(offset) (readb(rtc7301_base + offset) & 0xf)
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+#define write_reg(offset, data) writeb(data, rtc7301_base + (offset))
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+
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+#define rtc7301_isbusy() (read_reg(RTC7301_CTRLREG) & 1)
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+
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+static void rtc7301_init_settings(void)
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+{
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+ int i;
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+
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+ write_reg(RTC7301_CTRLREG, 2);
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+ write_reg(RTC7301_YEAR1000, 2);
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+ udelay(122);
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+
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+ /* bank 1 */
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+ write_reg(RTC7301_CTRLREG, 6);
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+ for (i=0; i<15; i++)
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+ write_reg(i, 0);
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+
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+ /* bank 2 */
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+ write_reg(RTC7301_CTRLREG, 14);
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+ for (i=0; i<15; i++)
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+ write_reg(i, 0);
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+ write_reg(RTC7301_CTRLREG, 0);
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+}
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+
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+static int rtc7301_get_datetime(struct device *dev, struct rtc_time *dt)
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+{
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+ int cnt;
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+ uint8_t buf[16];
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+
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+ cnt = 0;
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+ while (rtc7301_isbusy()) {
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+ udelay(244);
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+ if (cnt++ > 100) {
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+ dev_err(dev, "%s: timeout error %x\n", __func__, rtc7301_base[RTC7301_CTRLREG]);
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+ return -EIO;
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+ }
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+ }
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+
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+ for (cnt=0; cnt<16; cnt++)
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+ buf[cnt] = read_reg(cnt);
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+
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+ if (buf[RTC7301_SEC10] & 8) {
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+ dev_err(dev, "%s: RTC not set\n", __func__);
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+ return -EINVAL;
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+ }
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+
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+ memset(dt, 0, sizeof(*dt));
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+
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+ dt->tm_sec = buf[RTC7301_SEC] + buf[RTC7301_SEC10]*10;
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+ dt->tm_min = buf[RTC7301_MIN] + buf[RTC7301_MIN10]*10;
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+ dt->tm_hour = buf[RTC7301_HOUR] + buf[RTC7301_HOUR10]*10;
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+
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+ dt->tm_mday = buf[RTC7301_DAY] + buf[RTC7301_DAY10]*10;
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+ dt->tm_mon = buf[RTC7301_MON] + buf[RTC7301_MON10]*10 - 1;
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+ dt->tm_year = buf[RTC7301_YEAR] + buf[RTC7301_YEAR10]*10 +
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+ buf[RTC7301_YEAR100]*100 +
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+ ((buf[RTC7301_YEAR1000] & 3)*1000) - 1900;
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+
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+ /* the rtc device may contain illegal values on power up
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+ * according to the data sheet. make sure they are valid.
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+ */
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+
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+ return rtc_valid_tm(dt);
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+}
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+
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+static int rtc7301_set_datetime(struct device *dev, struct rtc_time *dt)
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+{
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+ int data;
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+
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+ data = dt->tm_year + 1900;
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+ if (data >= 2100 || data < 1900)
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+ return -EINVAL;
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+
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+ write_reg(RTC7301_CTRLREG, 2);
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+ udelay(122);
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+
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+ data = bin2bcd(dt->tm_sec);
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+ write_reg(RTC7301_SEC, data);
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+ write_reg(RTC7301_SEC10, (data >> 4));
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+
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+ data = bin2bcd(dt->tm_min);
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+ write_reg(RTC7301_MIN, data );
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+ write_reg(RTC7301_MIN10, (data >> 4));
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+
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+ data = bin2bcd(dt->tm_hour);
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+ write_reg(RTC7301_HOUR, data);
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+ write_reg(RTC7301_HOUR10, (data >> 4));
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+
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+ data = bin2bcd(dt->tm_mday);
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+ write_reg(RTC7301_DAY, data);
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+ write_reg(RTC7301_DAY10, (data>> 4));
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+
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+ data = bin2bcd(dt->tm_mon + 1);
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+ write_reg(RTC7301_MON, data);
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+ write_reg(RTC7301_MON10, (data >> 4));
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+
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+ data = bin2bcd(dt->tm_year % 100);
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+ write_reg(RTC7301_YEAR, data);
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+ write_reg(RTC7301_YEAR10, (data >> 4));
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+ data = bin2bcd((1900 + dt->tm_year) / 100);
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+ write_reg(RTC7301_YEAR100, data);
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+
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+ data = bin2bcd(dt->tm_wday);
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+ write_reg(RTC7301_WEEKDAY, data);
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+
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+ write_reg(RTC7301_CTRLREG, 0);
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+
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+ return 0;
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+}
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+
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+static const struct rtc_class_ops rtc7301_rtc_ops = {
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+ .read_time = rtc7301_get_datetime,
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+ .set_time = rtc7301_set_datetime,
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+};
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+
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+static int rtc7301_probe(struct platform_device *pdev)
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+{
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+ struct rtc_device *rtc;
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+ struct resource *res;
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+
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+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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+ if (!res)
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+ return -ENOENT;
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+
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+ rtc7301_base = ioremap_nocache(res->start, 0x1000 /*res->end - res->start + 1*/);
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+ if (!rtc7301_base)
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+ return -EINVAL;
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+
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+ rtc = rtc_device_register(RTC_NAME, &pdev->dev,
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+ &rtc7301_rtc_ops, THIS_MODULE);
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+ if (IS_ERR(rtc)) {
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+ iounmap(rtc7301_base);
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+ return PTR_ERR(rtc);
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+ }
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+
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+ platform_set_drvdata(pdev, rtc);
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+
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+ rtc7301_init_settings();
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+ return 0;
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+}
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+
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+static int rtc7301_remove(struct platform_device *pdev)
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+{
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+ struct rtc_device *rtc = platform_get_drvdata(pdev);
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+
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+ if (rtc)
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+ rtc_device_unregister(rtc);
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+ if (rtc7301_base)
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+ iounmap(rtc7301_base);
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+ return 0;
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+}
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+
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+static struct platform_driver rtc7301_driver = {
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+ .driver = {
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+ .name = RTC_NAME,
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+ .owner = THIS_MODULE,
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+ },
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+ .probe = rtc7301_probe,
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+ .remove = rtc7301_remove,
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+};
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+
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+static __init int rtc7301_init(void)
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+{
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+ return platform_driver_register(&rtc7301_driver);
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+}
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+module_init(rtc7301_init);
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+
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+static __exit void rtc7301_exit(void)
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+{
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+ platform_driver_unregister(&rtc7301_driver);
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+}
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+module_exit(rtc7301_exit);
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+
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+MODULE_DESCRIPTION("Epson 7301 RTC driver");
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+MODULE_AUTHOR("Jose Vasconcellos <jvasco@verizon.net>");
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+MODULE_LICENSE("GPL");
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+MODULE_ALIAS("platform:" RTC_NAME);
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+MODULE_VERSION(RTC_VERSION);
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