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authorStefan Roese <sr@denx.de>2016-07-19 07:45:46 +0200
committerBin Meng <bmeng.cn@gmail.com>2016-08-16 11:44:09 +0800
commit4cf9e464f78e58117b9a57e1e4e092e609d96b59 (patch)
tree7ab70fbffa0469833b1a39eb8ea8dc6d4d5b9cc3 /drivers/misc
parentd7b935bf62bafdf5fbe4734c7536754948958890 (diff)
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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: Stefan Roese <sr@denx.de> Reviewed-by: Bin Meng <bmeng.cn@gmail.com> Cc: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'drivers/misc')
-rw-r--r--drivers/misc/Kconfig8
-rw-r--r--drivers/misc/Makefile1
-rw-r--r--drivers/misc/nuvoton_nct6102d.c56
3 files changed, 65 insertions, 0 deletions
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 4af1cbf..8990489 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -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"
+ help
+ 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
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index dac9d10..c0e5f03 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -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
diff --git a/drivers/misc/nuvoton_nct6102d.c b/drivers/misc/nuvoton_nct6102d.c
new file mode 100644
index 0000000..ced70f1
--- /dev/null
+++ b/drivers/misc/nuvoton_nct6102d.c
@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2016 Stefan Roese <sr@denx.de>
+ *
+ * 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)
+{
+ superio_enter();
+ /* Select logical device for WDT */
+ superio_select(NCT6102D_LD_WDT);
+ superio_outb(NCT6102D_WDT_TIMEOUT, 0x00);
+ superio_exit();
+
+ return 0;
+}