diff options
Diffstat (limited to 'src/superio/winbond/w83627dhg/early_serial.c')
| -rw-r--r-- | src/superio/winbond/w83627dhg/early_serial.c | 29 |
1 files changed, 26 insertions, 3 deletions
diff --git a/src/superio/winbond/w83627dhg/early_serial.c b/src/superio/winbond/w83627dhg/early_serial.c index f530dc6797..e0be8dee75 100644 --- a/src/superio/winbond/w83627dhg/early_serial.c +++ b/src/superio/winbond/w83627dhg/early_serial.c @@ -2,6 +2,7 @@ * This file is part of the coreboot project. * * Copyright (C) 2008 Uwe Hermann <uwe@hermann-uwe.de> + * Copyright (C) 2012 Advanced Micro Devices, Inc. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by @@ -18,24 +19,26 @@ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ +#include <arch/io.h> #include <arch/romcc_io.h> +#include <device/pnp_def.h> #include <stdint.h> #include "w83627dhg.h" -static void pnp_enter_ext_func_mode(device_t dev) +void pnp_enter_ext_func_mode(device_t dev) { u16 port = dev >> 8; outb(0x87, port); outb(0x87, port); } -static void pnp_exit_ext_func_mode(device_t dev) +void pnp_exit_ext_func_mode(device_t dev) { u16 port = dev >> 8; outb(0xaa, port); } -static void w83627dhg_enable_serial(device_t dev, u16 iobase) +void w83627dhg_enable_serial(device_t dev, u16 iobase) { pnp_enter_ext_func_mode(dev); pnp_set_logical_device(dev); @@ -44,3 +47,23 @@ static void w83627dhg_enable_serial(device_t dev, u16 iobase) pnp_set_enable(dev, 1); pnp_exit_ext_func_mode(dev); } + +/** + * Select Pin 89, Pin 90 function as I2C interface SDA, SCL. + * {Pin 89, Pin 90} function can be selected as {GP33, GP32}, or + * {RSTOUT3#, RSTOUT2#} or {SDA, SCL} + */ +void w83627dhg_enable_i2c(device_t dev) +{ + u8 val; + + pnp_enter_ext_func_mode(dev); + pnp_set_logical_device(dev); + + val = pnp_read_config(dev, 0x2A); + val |= 1 << 1; + pnp_write_config(dev, 0x2A, val); + + pnp_exit_ext_func_mode(dev); +} + |