diff options
Diffstat (limited to 'src/soc/intel/baytrail/romstage/uart.c')
| -rw-r--r-- | src/soc/intel/baytrail/romstage/uart.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/src/soc/intel/baytrail/romstage/uart.c b/src/soc/intel/baytrail/romstage/uart.c new file mode 100644 index 0000000000..dee3be95c3 --- /dev/null +++ b/src/soc/intel/baytrail/romstage/uart.c @@ -0,0 +1,39 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2013 Google 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 + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include <arch/io.h> +#include <baytrail/gpio.h> +#include <baytrail/iomap.h> +#include <baytrail/lpc.h> +#include <baytrail/pci_devs.h> +#include <baytrail/romstage.h> + +void byt_config_com1_and_enable(void) +{ + uint32_t reg; + + /* Enable the UART hardware for COM1. */ + reg = 1; + pci_write_config32(PCI_DEV(0, LPC_DEV, 0), UART_CONT, reg); + + /* Set up the pads to select the UART function. RXD and TXD are + * 0x520 and 0x530, respectively. */ + write32(IO_BASE_ADDRESS + 0x520, read32(IO_BASE_ADDRESS + 0x520) | 1); + write32(IO_BASE_ADDRESS + 0x530, read32(IO_BASE_ADDRESS + 0x530) | 1); +} |