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-rw-r--r--src/drivers/ams/Kconfig11
-rw-r--r--src/drivers/ams/Makefile.inc1
-rw-r--r--src/drivers/ams/as3722rtc.c91
3 files changed, 103 insertions, 0 deletions
diff --git a/src/drivers/ams/Kconfig b/src/drivers/ams/Kconfig
new file mode 100644
index 0000000000..44b89c5f0c
--- /dev/null
+++ b/src/drivers/ams/Kconfig
@@ -0,0 +1,11 @@
+config DRIVERS_AS3722_RTC
+ bool "AS3722 RTC support"
+ default n
+
+config DRIVERS_AS3722_RTC_BUS
+ int "AS3722 RTC bus"
+ depends on DRIVERS_AS3722_RTC
+
+config DRIVERS_AS3722_RTC_ADDR
+ hex "AS3722 RTC chip address"
+ depends on DRIVERS_AS3722_RTC
diff --git a/src/drivers/ams/Makefile.inc b/src/drivers/ams/Makefile.inc
new file mode 100644
index 0000000000..cf5183196c
--- /dev/null
+++ b/src/drivers/ams/Makefile.inc
@@ -0,0 +1 @@
+ramstage-$(CONFIG_DRIVERS_AS3722_RTC) += as3722rtc.c
diff --git a/src/drivers/ams/as3722rtc.c b/src/drivers/ams/as3722rtc.c
new file mode 100644
index 0000000000..8fe5748e16
--- /dev/null
+++ b/src/drivers/ams/as3722rtc.c
@@ -0,0 +1,91 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2014 The Chromium OS Authors. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <bcd.h>
+#include <console/console.h>
+#include <device/i2c.h>
+#include <rtc.h>
+#include <stdint.h>
+
+enum AS3722_RTC_REG
+{
+ AS3722_RTC_CONTROL = 0x60,
+ AS3722_RTC_SECOND = 0x61,
+ AS3722_RTC_MINUTE = 0x62,
+ AS3722_RTC_HOUR = 0x63,
+ AS3722_RTC_DAY = 0x64,
+ AS3722_RTC_MONTH = 0x65,
+ AS3722_RTC_YEAR = 0x66
+};
+
+enum {
+ AS3722_RTC_CONTROL_ON = 0x1 << 2
+};
+
+static uint8_t as3722_read(enum AS3722_RTC_REG reg)
+{
+ uint8_t val;
+ i2c_readb(CONFIG_DRIVERS_AS3722_RTC_BUS,
+ CONFIG_DRIVERS_AS3722_RTC_ADDR, reg, &val);
+ return val;
+}
+
+static void as3722_write(enum AS3722_RTC_REG reg, uint8_t val)
+{
+ i2c_writeb(CONFIG_DRIVERS_AS3722_RTC_BUS,
+ CONFIG_DRIVERS_AS3722_RTC_ADDR, reg, val);
+}
+
+static void as3722rtc_init(void)
+{
+ static int initialized;
+ if (initialized)
+ return;
+
+ uint8_t control = as3722_read(AS3722_RTC_CONTROL);
+ as3722_write(AS3722_RTC_CONTROL, control | AS3722_RTC_CONTROL_ON);
+
+ initialized = 1;
+}
+
+int rtc_set(const struct rtc_time *time)
+{
+ as3722rtc_init();
+
+ as3722_write(AS3722_RTC_SECOND, bin2bcd(time->sec));
+ as3722_write(AS3722_RTC_MINUTE, bin2bcd(time->min));
+ as3722_write(AS3722_RTC_HOUR, bin2bcd(time->hour));
+ as3722_write(AS3722_RTC_DAY, bin2bcd(time->mday));
+ as3722_write(AS3722_RTC_MONTH, bin2bcd(time->mon + 1));
+ as3722_write(AS3722_RTC_YEAR, bin2bcd(time->year));
+ return 0;
+}
+
+int rtc_get(struct rtc_time *time)
+{
+ as3722rtc_init();
+
+ time->sec = bcd2bin(as3722_read(AS3722_RTC_SECOND) & 0x7f);
+ time->min = bcd2bin(as3722_read(AS3722_RTC_MINUTE) & 0x7f);
+ time->hour = bcd2bin(as3722_read(AS3722_RTC_HOUR) & 0x3f);
+ time->mday = bcd2bin(as3722_read(AS3722_RTC_DAY) & 0x3f);
+ time->mon = bcd2bin(as3722_read(AS3722_RTC_MONTH) & 0x1f) - 1;
+ time->year = bcd2bin(as3722_read(AS3722_RTC_YEAR) & 0x7f);
+ return 0;
+}