[U-Boot] [PATCHv2] rtc: add driver for internal RTC on kirkwood SoC

[Luuk Paulussen]

From: Luuk Paulussen <luuk.paulussen at alliedtelesis.co.nz>

Signed-off-by: Luuk Paulussen <luuk.paulussen at alliedtelesis.co.nz>
Acked-by: Chris Packham <chris.packham at alliedtelesis.co.nz>
Cc: Prafulla Wadaskar <prafulla at marvell.com>
---
Changes since v2:
- Fixed Month setting/getting. Month was off by one due to difference
  between linux and u-boot time rtc time structure.
Changes since v1:
- run through checkpatch.pl and fix style issues (spaces before bracket and
  lines > 80 chars)

 arch/arm/include/asm/arch-kirkwood/kirkwood.h |    2 +
 drivers/rtc/Makefile                          |    1 +
 drivers/rtc/kirkwood.c                        |   79 +++++++++++++++++++++++++
 3 files changed, 82 insertions(+), 0 deletions(-)
 create mode 100644 drivers/rtc/kirkwood.c

diff --git a/arch/arm/include/asm/arch-kirkwood/kirkwood.h
b/arch/arm/include/asm/arch-kirkwood/kirkwood.h
index 0104418..15922eb 100644
--- a/arch/arm/include/asm/arch-kirkwood/kirkwood.h
+++ b/arch/arm/include/asm/arch-kirkwood/kirkwood.h
@@ -50,6 +50,8 @@
 #define KW_MPP_BASE			(KW_REGISTER(0x10000))
 #define KW_GPIO0_BASE			(KW_REGISTER(0x10100))
 #define KW_GPIO1_BASE			(KW_REGISTER(0x10140))
+#define KW_RTC_TIME			(KW_REGISTER(0x10300))
+#define KW_RTC_DATE			(KW_REGISTER(0x10304))
 #define KW_NANDF_BASE			(KW_REGISTER(0x10418))
 #define KW_SPI_BASE			(KW_REGISTER(0x10600))
 #define KW_CPU_WIN_BASE			(KW_REGISTER(0x20000))
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index e4be4a4..ec064d9 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -43,6 +43,7 @@ COBJS-$(CONFIG_RTC_DS174x) += ds174x.o
 COBJS-$(CONFIG_RTC_DS3231) += ds3231.o
 COBJS-$(CONFIG_RTC_FTRTC010) += ftrtc010.o
 COBJS-$(CONFIG_RTC_ISL1208) += isl1208.o
+COBJS-$(CONFIG_RTC_KIRKWOOD) += kirkwood.o
 COBJS-$(CONFIG_RTC_M41T11) += m41t11.o
 COBJS-$(CONFIG_RTC_M41T60) += m41t60.o
 COBJS-$(CONFIG_RTC_M41T62) += m41t62.o
diff --git a/drivers/rtc/kirkwood.c b/drivers/rtc/kirkwood.c
new file mode 100644
index 0000000..b08fd91
--- /dev/null
+++ b/drivers/rtc/kirkwood.c
@@ -0,0 +1,79 @@
+/*
+ * Driver for the RTC in Marvell SoCs.
+ *
+ * Based on Linux Kernel driver.
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2.  This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <common.h>
+#include <command.h>
+#include <rtc.h>
+#include <bcd.h>
+#include <asm/arch/kirkwood.h>
+
+#if defined(CONFIG_CMD_DATE)
+
+#define RTC_TIME_REG_OFFS	0
+#define RTC_SECONDS_OFFS	0
+#define RTC_MINUTES_OFFS	8
+#define RTC_HOURS_OFFS		16
+#define RTC_WDAY_OFFS		24
+#define RTC_HOURS_12H_MODE		(1 << 22) /* 12 hours mode */
+
+#define RTC_DATE_REG_OFFS	4
+#define RTC_MDAY_OFFS		0
+#define RTC_MONTH_OFFS		8
+#define RTC_YEAR_OFFS		16
+#define KIRKWOOD_YEAR_BASE	2000
+
+int rtc_set(struct rtc_time *tmp)
+{
+	ulong	rtc_reg;
+
+	GregorianDay(tmp);
+
+	rtc_reg = (bin2bcd(tmp->tm_sec) << RTC_SECONDS_OFFS) |
+			(bin2bcd(tmp->tm_min) << RTC_MINUTES_OFFS) |
+			(bin2bcd(tmp->tm_hour) << RTC_HOURS_OFFS) |
+			(bin2bcd(tmp->tm_wday) << RTC_WDAY_OFFS);
+	writel(rtc_reg, KW_RTC_TIME);
+
+	rtc_reg = (bin2bcd(tmp->tm_mday) << RTC_MDAY_OFFS) |
+			(bin2bcd(tmp->tm_mon) << RTC_MONTH_OFFS) |
+			(bin2bcd(tmp->tm_year - KIRKWOOD_YEAR_BASE)
+				<< RTC_YEAR_OFFS);
+	writel(rtc_reg, KW_RTC_DATE);
+
+	return 0;
+}
+
+int rtc_get(struct rtc_time *tmp)
+{
+	ulong	rtc_time, rtc_date;
+
+	rtc_time = readl(KW_RTC_TIME);
+	rtc_date = readl(KW_RTC_DATE);
+
+	tmp->tm_sec = bcd2bin(rtc_time & 0x7f);
+	tmp->tm_min = bcd2bin((rtc_time >> RTC_MINUTES_OFFS) & 0x7f);
+	/* assume 24 hour mode */
+	tmp->tm_hour = bcd2bin((rtc_time >> RTC_HOURS_OFFS) & 0x3f);
+	tmp->tm_mday = bcd2bin(rtc_date & 0x3f);
+	tmp->tm_wday = bcd2bin((rtc_time >> RTC_WDAY_OFFS) & 0x7);
+	tmp->tm_mon = bcd2bin((rtc_date >> RTC_MONTH_OFFS) & 0x3f);
+	/* hw counts from year 2000, but tm_year is relative to 0 */
+	tmp->tm_year = bcd2bin((rtc_date >> RTC_YEAR_OFFS) & 0xff)
+		+ KIRKWOOD_YEAR_BASE;
+
+	return 0;
+}
+
+void rtc_reset(void)
+{
+	return;
+}
+
+#endif /* CONFIG_CMD_DATE */
-- 
1.7.4.1