Add max77620-rtc driver & disable alarm on shut off

Makefile

@@ -53,6 +53,7 @@ OBJS = $(addprefix $(BUILD)/$(TARGET)/, \
 	ini.o \
 	ianos.o \
 	smmu.o \
+	max77620-rtc.o \
 )
 
 OBJS += $(addprefix $(BUILD)/$(TARGET)/, \

bootloader/main.c

@@ -31,6 +31,7 @@
 #include "mem/heap.h"
 #include "mem/sdram.h"
 #include "power/max77620.h"
+#include "rtc/max77620-rtc.h"
 #include "soc/hw_init.h"
 #include "soc/i2c.h"
 #include "soc/pmc.h"
@@ -229,6 +230,10 @@ void reboot_rcm()
 void power_off()
 {
 	sd_unmount();
+
+	// Stop the alarm, in case we injected and powered off too fast.
+	max77620_rtc_stop_alarm();
+
 #ifdef MENU_LOGO_ENABLE
 	free(Kc_MENU_LOGO);
 #endif //MENU_LOGO_ENABLE
@@ -243,6 +248,10 @@ void check_power_off_from_hos()
 	if (hosWakeup & MAX77620_IRQ_TOP_RTC_MASK)
 	{
 		sd_unmount();
+
+		// Stop the alarm, in case we injected too fast.
+		max77620_rtc_stop_alarm();
+
 		if (h_cfg.autohosoff == 1)
 		{
 			gfx_clear_grey(&gfx_ctxt, 0x1B);

bootloader/rtc/max77620-rtc.c

@@ -0,0 +1,77 @@
+/*
+ * PMIC Real Time Clock driver for Nintendo Switch's MAX77620-RTC
+ *
+ * Copyright (c) 2018 CTCaer
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "max77620-rtc.h"
+#include "../soc/i2c.h"
+#include "../utils/util.h"
+
+void max77620_rtc_get_time(rtc_time_t *time)
+{
+	u8 val = 0;
+
+	// Update RTC regs from RTC clock.
+	i2c_send_byte(I2C_5, MAX77620_RTC_I2C_ADDR, MAX77620_RTC_UPDATE0_REG, MAX77620_RTC_READ_UPDATE);
+
+	// Get control reg config.
+	val = i2c_recv_byte(I2C_5, MAX77620_RTC_I2C_ADDR, MAX77620_RTC_CONTROL_REG);
+	// TODO: Check for binary format also?
+
+	// Get time.
+	time->sec  = i2c_recv_byte(I2C_5, MAX77620_RTC_I2C_ADDR, MAX77620_RTC_SEC_REG) & 0x7F;
+	time->min  = i2c_recv_byte(I2C_5, MAX77620_RTC_I2C_ADDR, MAX77620_RTC_MIN_REG) & 0x7F;
+
+	time->hour = i2c_recv_byte(I2C_5, MAX77620_RTC_I2C_ADDR, MAX77620_RTC_HOUR_REG) & 0x1F;
+	
+	if (!(val & MAX77620_RTC_24H) && time->hour & MAX77620_RTC_HOUR_PM_MASK)
+		time->hour = (time->hour & 0xF) + 12;
+
+	// Get day of week. 1: Monday to 7: Sunday.
+	time->weekday = 0;
+	val = i2c_recv_byte(I2C_5, MAX77620_RTC_I2C_ADDR, MAX77620_RTC_WEEKDAY_REG);
+	for (int i = 0; i < 8; i++)
+	{
+		time->weekday++;
+		if (val & 1)
+			break;
+		val >>= 1;
+	}
+
+	// Get date.
+	time->date  = i2c_recv_byte(I2C_5, MAX77620_RTC_I2C_ADDR, MAX77620_RTC_DATE_REG) & 0x1f;
+	time->month = (i2c_recv_byte(I2C_5, MAX77620_RTC_I2C_ADDR, MAX77620_RTC_MONTH_REG) & 0xF) - 1;
+	time->year  = (i2c_recv_byte(I2C_5, MAX77620_RTC_I2C_ADDR, MAX77620_RTC_YEAR_REG) & 0x7F) + 2000;
+}
+
+void max77620_rtc_stop_alarm()
+{
+	u8 val = 0;
+
+	// Update RTC regs from RTC clock.
+	i2c_send_byte(I2C_5, MAX77620_RTC_I2C_ADDR, MAX77620_RTC_UPDATE0_REG, MAX77620_RTC_READ_UPDATE);
+
+	// Stop alarm for both ALARM1 and ALARM2. Horizon uses ALARM2.
+	for (int i = 0; i < (MAX77620_RTC_NR_TIME_REGS * 2); i++)
+	{
+		val = i2c_recv_byte(I2C_5, MAX77620_RTC_I2C_ADDR, MAX77620_ALARM1_SEC_REG + i);
+		val &= ~MAX77620_RTC_ALARM_EN_MASK;
+		i2c_send_byte(I2C_5, MAX77620_RTC_I2C_ADDR, MAX77620_ALARM1_SEC_REG + i, val);
+	}
+
+	// Update RTC clock from RTC regs.
+	i2c_send_byte(I2C_5, MAX77620_RTC_I2C_ADDR, MAX77620_RTC_UPDATE0_REG, MAX77620_RTC_WRITE_UPDATE);
+}

bootloader/rtc/max77620-rtc.h

@@ -0,0 +1,75 @@
+/*
+ * PMIC Real Time Clock driver for Nintendo Switch's MAX77620-RTC
+ *
+ * Copyright (c) 2018 CTCaer
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _MFD_MAX77620_RTC_H_
+#define _MFD_MAX77620_RTC_H_
+
+#include "../utils/types.h"
+
+#define MAX77620_RTC_I2C_ADDR       0x68
+
+#define MAX77620_RTC_NR_TIME_REGS   7
+
+#define MAX77620_RTC_CONTROLM_REG   0x02
+#define MAX77620_RTC_CONTROL_REG    0x03
+#define  MAX77620_RTC_BIN_FORMAT (1 << 0)
+#define  MAX77620_RTC_24H        (1 << 1)
+
+#define MAX77620_RTC_UPDATE0_REG    0x04
+#define  MAX77620_RTC_WRITE_UPDATE  (1 << 0)
+#define  MAX77620_RTC_READ_UPDATE   (1 << 4)
+
+#define MAX77620_RTC_SEC_REG        0x07
+#define MAX77620_RTC_MIN_REG        0x08
+#define MAX77620_RTC_HOUR_REG       0x09
+#define  MAX77620_RTC_HOUR_PM_MASK  (1 << 6)
+#define MAX77620_RTC_WEEKDAY_REG    0x0A
+#define MAX77620_RTC_MONTH_REG      0x0B
+#define MAX77620_RTC_YEAR_REG       0x0C
+#define MAX77620_RTC_DATE_REG       0x0D
+
+#define MAX77620_ALARM1_SEC_REG     0x0E
+#define MAX77620_ALARM1_MIN_REG     0x0F
+#define MAX77620_ALARM1_HOUR_REG    0x10
+#define MAX77620_ALARM1_WEEKDAY_REG 0x11
+#define MAX77620_ALARM1_MONTH_REG   0x12
+#define MAX77620_ALARM1_YEAR_REG    0x13
+#define MAX77620_ALARM1_DATE_REG    0x14
+#define MAX77620_ALARM2_SEC_REG     0x15
+#define MAX77620_ALARM2_MIN_REG     0x16
+#define MAX77620_ALARM2_HOUR_REG    0x17
+#define MAX77620_ALARM2_WEEKDAY_REG 0x18
+#define MAX77620_ALARM2_MONTH_REG   0x19
+#define MAX77620_ALARM2_YEAR_REG    0x1A
+#define MAX77620_ALARM2_DATE_REG    0x1B
+#define  MAX77620_RTC_ALARM_EN_MASK	(1 << 7)
+
+typedef struct _rtc_time_t {
+	u8  weekday;
+	u8  sec;
+	u8  min;
+	u8  hour;
+	u8  date;
+	u8  month;
+	u16 year;
+} rtc_time_t;
+
+void max77620_rtc_get_time(rtc_time_t *time);
+void max77620_rtc_stop_alarm();
+
+#endif /* _MFD_MAX77620_RTC_H_ */