From 85056932f2bad4b6749d42c983d2219ae70fa741 Mon Sep 17 00:00:00 2001 From: Stefan Roese Date: Tue, 19 Jan 2016 14:05:10 +0100 Subject: [PATCH] misc: Add simple driver to enable the legacy UART on Winbond Super IO chips 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: Stefan Roese Cc: Bin Meng Cc: Simon Glass Reviewed-by: Bin Meng --- drivers/misc/Kconfig | 8 +++++++ drivers/misc/Makefile | 1 + drivers/misc/winbond_w83627.c | 41 +++++++++++++++++++++++++++++++++++ include/winbond_w83627.h | 35 ++++++++++++++++++++++++++++++ 4 files changed, 85 insertions(+) create mode 100644 drivers/misc/winbond_w83627.c create mode 100644 include/winbond_w83627.h diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig index cba236334c..af8667f030 100644 --- a/drivers/misc/Kconfig +++ b/drivers/misc/Kconfig @@ -130,4 +130,12 @@ config RESET effect a reset. The uclass will try all available drivers when reset_walk() is called. +config WINBOND_W83627 + bool "Enable Winbond Super I/O driver" + help + If you say Y here, you will get support for the Winbond + W83627 Super I/O driver. This can be used to enable the + legacy UART or other devices in the Winbond Super IO chips + on X86 platforms. + endmenu diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile index cd4846b4a8..e1e3c6b70f 100644 --- a/drivers/misc/Makefile +++ b/drivers/misc/Makefile @@ -41,3 +41,4 @@ obj-$(CONFIG_FSL_SEC_MON) += fsl_sec_mon.o obj-$(CONFIG_PCA9551_LED) += pca9551_led.o obj-$(CONFIG_RESET) += reset-uclass.o obj-$(CONFIG_FSL_DEVICE_DISABLE) += fsl_devdis.o +obj-$(CONFIG_WINBOND_W83627) += winbond_w83627.o diff --git a/drivers/misc/winbond_w83627.c b/drivers/misc/winbond_w83627.c new file mode 100644 index 0000000000..59db7d971c --- /dev/null +++ b/drivers/misc/winbond_w83627.c @@ -0,0 +1,41 @@ +/* + * Copyright (C) 2016 Stefan Roese + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include +#include +#include + +#define WINBOND_ENTRY_KEY 0x87 +#define WINBOND_EXIT_KEY 0xaa + +/* Enable configuration: pass entry key '0x87' into index port dev twice */ +static void pnp_enter_conf_state(u16 dev) +{ + u16 port = dev >> 8; + + outb(WINBOND_ENTRY_KEY, port); + outb(WINBOND_ENTRY_KEY, port); +} + +/* Disable configuration: pass exit key '0xAA' into index port dev */ +static void pnp_exit_conf_state(u16 dev) +{ + u16 port = dev >> 8; + + outb(WINBOND_EXIT_KEY, port); +} + +/* Bring up early serial debugging output before the RAM is initialized */ +void winbond_enable_serial(uint dev, uint iobase, uint irq) +{ + 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_irq(dev, PNP_IDX_IRQ0, irq); + pnp_set_enable(dev, 1); + pnp_exit_conf_state(dev); +} diff --git a/include/winbond_w83627.h b/include/winbond_w83627.h new file mode 100644 index 0000000000..ac3bec6f9f --- /dev/null +++ b/include/winbond_w83627.h @@ -0,0 +1,35 @@ +/* + * Copyright (C) 2016 Stefan Roese + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#ifndef _WINBOND_W83627_H_ +#define _WINBOND_W83627_H_ + +/* I/O address of Winbond Super IO chip */ +#define WINBOND_IO_PORT 0x2e + +/* Logical device number */ +#define W83627DHG_FDC 0 /* Floppy */ +#define W83627DHG_PP 1 /* Parallel port */ +#define W83627DHG_SP1 2 /* Com1 */ +#define W83627DHG_SP2 3 /* Com2 */ +#define W83627DHG_KBC 5 /* PS/2 keyboard & mouse */ +#define W83627DHG_SPI 6 /* Serial peripheral interface */ +#define W83627DHG_WDTO_PLED 8 /* WDTO#, PLED */ +#define W83627DHG_ACPI 10 /* ACPI */ +#define W83627DHG_HWM 11 /* Hardware monitor */ +#define W83627DHG_PECI_SST 12 /* PECI, SST */ + +/** + * Configure the base I/O port of the specified serial device and enable the + * serial device. + * + * @dev: high 8 bits = super I/O port, low 8 bits = logical device number + * @iobase: processor I/O port address to assign to this serial device + * @irq: processor IRQ number to assign to this serial device + */ +void winbond_enable_serial(uint dev, uint iobase, uint irq); + +#endif /* _WINBOND_W83627_H_ */ -- 2.39.5