Commit 4cf9e464 authored by Stefan Roese's avatar Stefan Roese Committed by Bin Meng

misc: Add simple driver for some Nuvoton NCT6102D devices

This simple driver provides some functions to control some of the
integrated devices. The watchdog is enabled per default. This driver
adds a function to disable the watchdog. Also the internal legacy
UART (io address 0x3f8/0x2f8) is enabled per default.
Signed-off-by: default avatarStefan Roese <>
Reviewed-by: default avatarBin Meng <>
Cc: Simon Glass <>
parent d7b935bf
......@@ -90,6 +90,14 @@ config MXC_OCOTP
Programmable memory pages that are stored on the some
Freescale i.MX processors.
config NUVOTON_NCT6102D
bool "Enable Nuvoton NCT6102D Super I/O driver"
If you say Y here, you will get support for the Nuvoton
NCT6102D Super I/O driver. This can be used to enable or
disable the legacy UART, the watchdog or other devices
in the Nuvoton Super IO chips on X86 platforms.
config PWRSEQ
bool "Enable power-sequencing drivers"
depends on DM
......@@ -24,6 +24,7 @@ obj-$(CONFIG_I2C_EEPROM) += i2c_eeprom.o
obj-$(CONFIG_FSL_MC9SDZ60) += mc9sdz60.o
obj-$(CONFIG_MXC_OCOTP) += mxc_ocotp.o
obj-$(CONFIG_MXS_OCOTP) += mxs_ocotp.o
obj-$(CONFIG_NUVOTON_NCT6102D) += nuvoton_nct6102d.o
obj-$(CONFIG_NS87308) += ns87308.o
obj-$(CONFIG_PDSP188x) += pdsp188x.o
obj-$(CONFIG_$(SPL_)PWRSEQ) += pwrseq-uclass.o
* Copyright (C) 2016 Stefan Roese <>
* SPDX-License-Identifier: GPL-2.0+
#include <common.h>
#include <nuvoton_nct6102d.h>
#include <asm/io.h>
#include <asm/pnp_def.h>
static void superio_outb(int reg, int val)
outb(reg, NCT_EFER);
outb(val, NCT_EFDR);
static inline int superio_inb(int reg)
outb(reg, NCT_EFER);
return inb(NCT_EFDR);
static int superio_enter(void)
outb(NCT_ENTRY_KEY, NCT_EFER); /* Enter extended function mode */
outb(NCT_ENTRY_KEY, NCT_EFER); /* Again according to manual */
return 0;
static void superio_select(int ld)
superio_outb(NCT_LD_SELECT_REG, ld);
static void superio_exit(void)
outb(NCT_EXIT_KEY, NCT_EFER); /* Leave extended function mode */
* The Nuvoton NCT6102D starts per default after reset with both,
* the internal watchdog and the internal legacy UART enabled. This
* code provides a function to disable the watchdog.
int nct6102d_wdt_disable(void)
/* Select logical device for WDT */
superio_outb(NCT6102D_WDT_TIMEOUT, 0x00);
return 0;
* Copyright (C) 2016 Stefan Roese <>
* SPDX-License-Identifier: GPL-2.0+
#ifndef _NUVOTON_NCT6102D_H_
#define _NUVOTON_NCT6102D_H_
/* I/O address of Nuvoton Super IO chip */
#define NCT6102D_IO_PORT 0x4e
/* Extended Function Enable Registers */
#define NCT_EFER (NCT6102D_IO_PORT + 0)
/* Extended Function Index Register (same as EFER) */
#define NCT_EFIR (NCT6102D_IO_PORT + 0)
/* Extended Function Data Register */
#define NCT_EFDR (NCT_EFIR + 1)
#define NCT_LD_SELECT_REG 0x07
/* Logical device number */
#define NCT6102D_LD_UARTA 0x02
#define NCT6102D_LD_WDT 0x08
#define NCT6102D_UARTA_ENABLE 0x30
#define NCT6102D_WDT_TIMEOUT 0xf1
#define NCT_ENTRY_KEY 0x87
#define NCT_EXIT_KEY 0xaa
int nct6102d_wdt_disable(void);
#endif /* _NUVOTON_NCT6102D_H_ */
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