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-rw-r--r--src/drivers/ti/tps65913/Kconfig35
-rw-r--r--src/drivers/ti/tps65913/Makefile.inc20
-rw-r--r--src/drivers/ti/tps65913/tps65913rtc.c155
3 files changed, 210 insertions, 0 deletions
diff --git a/src/drivers/ti/tps65913/Kconfig b/src/drivers/ti/tps65913/Kconfig
new file mode 100644
index 0000000000..bd24baeeba
--- /dev/null
+++ b/src/drivers/ti/tps65913/Kconfig
@@ -0,0 +1,35 @@
+##
+## This file is part of the coreboot project.
+##
+## Copyright 2014 Google Inc.
+##
+## 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
+##
+
+config DRIVERS_TI_TPS65913
+ bool "TI TPS65913 support"
+ default n
+
+config DRIVERS_TI_TPS65913_RTC
+ bool "TI TPS65913 RTC support"
+ default n
+ select DRIVERS_TI_TPS65913
+
+config DRIVERS_TI_TPS65913_RTC_BUS
+ int "TI TPS65913 RTC bus"
+ depends on DRIVERS_TI_TPS65913_RTC
+
+config DRIVERS_TI_TPS65913_RTC_ADDR
+ hex "TI TPS65913 RTC chip address"
+ depends on DRIVERS_TI_TPS65913_RTC
diff --git a/src/drivers/ti/tps65913/Makefile.inc b/src/drivers/ti/tps65913/Makefile.inc
new file mode 100644
index 0000000000..272b026383
--- /dev/null
+++ b/src/drivers/ti/tps65913/Makefile.inc
@@ -0,0 +1,20 @@
+##
+## This file is part of the coreboot project.
+##
+## Copyright 2014 Google Inc.
+##
+## 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
+##
+
+ramstage-$(CONFIG_DRIVERS_TI_TPS65913_RTC) += tps65913rtc.c
diff --git a/src/drivers/ti/tps65913/tps65913rtc.c b/src/drivers/ti/tps65913/tps65913rtc.c
new file mode 100644
index 0000000000..46dd4f9dd0
--- /dev/null
+++ b/src/drivers/ti/tps65913/tps65913rtc.c
@@ -0,0 +1,155 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2014 Google Inc.
+ *
+ * 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 TPS65913_RTC_REG {
+ TPS65913_SECONDS_REG = 0x00,
+ TPS65913_MINUTES_REG = 0x01,
+ TPS65913_HOURS_REG = 0x02,
+ TPS65913_DAYS_REG = 0x03,
+ TPS65913_MONTHS_REG = 0x04,
+ TPS65913_YEARS_REG = 0x05,
+ TPS65913_WEEKS_REG = 0x06,
+ TPS65913_RTC_CTRL_REG = 0x10,
+ TPS65913_RTC_STATUS_REG = 0x11,
+ TPS65913_RTC_INTERRUPS_REG = 0x12,
+};
+
+enum {
+ TPS65913_RTC_CTRL_STOP = (1 << 0),
+ TPS65913_RTC_CTRL_GET_TIME = (1 << 6),
+
+ TPS65913_RTC_STATUS_RUN = (1 << 1),
+ TPS65913_RTC_RUNNING = (1 << 1),
+ TPS65913_RTC_FROZEN = (0 << 1),
+};
+
+static inline uint8_t tps65913_read(enum TPS65913_RTC_REG reg)
+{
+ uint8_t val;
+ i2c_readb(CONFIG_DRIVERS_TI_TPS65913_RTC_BUS,
+ CONFIG_DRIVERS_TI_TPS65913_RTC_ADDR, reg, &val);
+ return val;
+}
+
+static inline void tps65913_write(enum TPS65913_RTC_REG reg, uint8_t val)
+{
+ i2c_writeb(CONFIG_DRIVERS_TI_TPS65913_RTC_BUS,
+ CONFIG_DRIVERS_TI_TPS65913_RTC_ADDR, reg, val);
+}
+
+static void tps65913_rtc_ctrl_clear(uint8_t bit)
+{
+ uint8_t control = tps65913_read(TPS65913_RTC_CTRL_REG);
+
+ control &= ~bit;
+ tps65913_write(TPS65913_RTC_CTRL_REG, control);
+}
+
+static void tps65913_rtc_ctrl_set(uint8_t bit)
+{
+ uint8_t control = tps65913_read(TPS65913_RTC_CTRL_REG);
+
+ control |= TPS65913_RTC_CTRL_GET_TIME;
+ tps65913_write(TPS65913_RTC_CTRL_REG, control);
+}
+
+static int tps65913_is_rtc_running(void)
+{
+ uint8_t status = tps65913_read(TPS65913_RTC_STATUS_REG);
+ return ((status & TPS65913_RTC_STATUS_RUN) == TPS65913_RTC_RUNNING);
+}
+
+/*
+ * This function ensures that current time is copied to shadow registers. Then a
+ * normal read on TC registers reads from the shadow instead of current TC
+ * registers. This helps prevent the accidental change in counters while
+ * reading. In order to ensure that the current TC registers are copied into
+ * shadow registers, GET_TIME bit needs to be set to 0 and then to 1.
+ */
+static void tps65913_rtc_shadow(void)
+{
+ tps65913_rtc_ctrl_clear(TPS65913_RTC_CTRL_GET_TIME);
+ tps65913_rtc_ctrl_set(TPS65913_RTC_CTRL_GET_TIME);
+}
+
+static int tps65913_rtc_stop(void)
+{
+ /* Clearing stop bit freezes RTC */
+ tps65913_rtc_ctrl_clear(TPS65913_RTC_CTRL_STOP);
+
+ if (tps65913_is_rtc_running()) {
+ printk(BIOS_ERR, "Could not stop RTC\n");
+ return 1;
+ }
+
+ return 0;
+}
+
+static int tps65913_rtc_start(void)
+{
+ /* Setting stop bit starts RTC */
+ tps65913_rtc_ctrl_set(TPS65913_RTC_CTRL_STOP);
+
+ if (!tps65913_is_rtc_running()) {
+ printk(BIOS_ERR, "Could not start RTC\n");
+ return 1;
+ }
+
+ return 0;
+}
+
+int rtc_set(const struct rtc_time *time)
+{
+ /* Before setting the time, ensure that rtc is stopped */
+ if (tps65913_rtc_stop())
+ return 1;
+
+ tps65913_write(TPS65913_SECONDS_REG, bin2bcd(time->sec));
+ tps65913_write(TPS65913_MINUTES_REG, bin2bcd(time->min));
+ tps65913_write(TPS65913_HOURS_REG, bin2bcd(time->hour));
+ tps65913_write(TPS65913_DAYS_REG, bin2bcd(time->mday));
+ tps65913_write(TPS65913_MONTHS_REG, bin2bcd(time->mon));
+ tps65913_write(TPS65913_YEARS_REG, bin2bcd(time->year));
+
+ /* Re-start rtc */
+ if (tps65913_rtc_start())
+ return 1;
+
+ return 0;
+}
+
+int rtc_get(struct rtc_time *time)
+{
+ tps65913_rtc_shadow();
+
+ time->sec = bcd2bin(tps65913_read(TPS65913_SECONDS_REG) & 0x7f);
+ time->min = bcd2bin(tps65913_read(TPS65913_MINUTES_REG) & 0x7f);
+ time->hour = bcd2bin(tps65913_read(TPS65913_HOURS_REG) & 0x3f);
+ time->mday = bcd2bin(tps65913_read(TPS65913_DAYS_REG) & 0x3f);
+ time->mon = bcd2bin(tps65913_read(TPS65913_MONTHS_REG) & 0x1f);
+ time->year = bcd2bin(tps65913_read(TPS65913_YEARS_REG) & 0xff);
+
+ return 0;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-01 05:51:10 +0000