From a2927e09bccca5b665709d77fc54919292d4bcb7 Mon Sep 17 00:00:00 2001 From: Bin Meng Date: Fri, 12 Dec 2014 21:05:25 +0800 Subject: x86: Add a simple superio driver for SMSC LPC47M On most x86 boards, the legacy serial ports (io address 0x3f8/0x2f8) are provided by a superio chip connected to the LPC bus. We must program the superio chip so that serial ports are available for us. Signed-off-by: Bin Meng Acked-by: Simon Glass --- drivers/misc/Makefile | 1 + drivers/misc/smsc_lpc47m.c | 33 +++++++++++++++++++++++++++++++++ 2 files changed, 34 insertions(+) create mode 100644 drivers/misc/smsc_lpc47m.c (limited to 'drivers') diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile index 6fa836f..a34972d 100644 --- a/drivers/misc/Makefile +++ b/drivers/misc/Makefile @@ -24,6 +24,7 @@ obj-$(CONFIG_PDSP188x) += pdsp188x.o ifdef CONFIG_DM_I2C obj-$(CONFIG_SANDBOX) += i2c_eeprom_emul.o endif +obj-$(CONFIG_SMSC_LPC47M) += smsc_lpc47m.o obj-$(CONFIG_STATUS_LED) += status_led.o obj-$(CONFIG_TWL4030_LED) += twl4030_led.o obj-$(CONFIG_FSL_IFC) += fsl_ifc.o diff --git a/drivers/misc/smsc_lpc47m.c b/drivers/misc/smsc_lpc47m.c new file mode 100644 index 0000000..d51f8e3 --- /dev/null +++ b/drivers/misc/smsc_lpc47m.c @@ -0,0 +1,33 @@ +/* + * Copyright (C) 2014, Bin Meng + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include +#include +#include + +static void pnp_enter_conf_state(u16 dev) +{ + u16 port = dev >> 8; + + outb(0x55, port); +} + +static void pnp_exit_conf_state(u16 dev) +{ + u16 port = dev >> 8; + + outb(0xaa, port); +} + +void lpc47m_enable_serial(u16 dev, u16 iobase) +{ + pnp_enter_conf_state(dev); + pnp_set_logical_device(dev); + pnp_set_enable(dev, 0); + pnp_set_iobase(dev, PNP_IDX_IO0, iobase); + pnp_set_enable(dev, 1); + pnp_exit_conf_state(dev); +} -- cgit v1.1