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 sr@denx.de Cc: Bin Meng bmeng.cn@gmail.com Cc: Simon Glass sjg@chromium.org --- drivers/misc/Kconfig | 7 +++++++ drivers/misc/Makefile | 1 + drivers/misc/winbond_w83627.c | 41 +++++++++++++++++++++++++++++++++++++++++ include/winbond_w83627.h | 35 +++++++++++++++++++++++++++++++++++ 4 files changed, 84 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 b92da4e..e024fa7 100644 --- a/drivers/misc/Kconfig +++ b/drivers/misc/Kconfig @@ -112,4 +112,11 @@ config RESET effect a reset. The uclass will try all available drivers when reset_walk() is called.
+config WINBOND_W83627 + bool "Enable Winbond legacy UART driver" + help + If you say Y here, you will get support for the Winbond + W83627 legacy UART driver. This can be used to enable the + legacy UART in the Winbond Super IO chips on X86 platforms. + endmenu diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile index aa137f5..15505bf 100644 --- a/drivers/misc/Makefile +++ b/drivers/misc/Makefile @@ -38,3 +38,4 @@ 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 0000000..7c6a033 --- /dev/null +++ b/drivers/misc/winbond_w83627.c @@ -0,0 +1,41 @@ +/* + * Copyright (C) 2016 Stefan Roese sr@denx.de + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <asm/io.h> +#include <asm/pnp_def.h> + +#define WINBOND_ENTRY_KEY 0x87 +#define WINBOND_EXIT_KEY 0xAA + +/* Enable configuration: pass entry key '0x87' into index port dev. */ +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 0000000..ac3bec6 --- /dev/null +++ b/include/winbond_w83627.h @@ -0,0 +1,35 @@ +/* + * Copyright (C) 2016 Stefan Roese sr@denx.de + * + * 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_ */