diff options
Diffstat (limited to 'src/soc/intel/skylake/romstage/smbus.c')
-rw-r--r-- | src/soc/intel/skylake/romstage/smbus.c | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/src/soc/intel/skylake/romstage/smbus.c b/src/soc/intel/skylake/romstage/smbus.c new file mode 100644 index 0000000000..f09459bedd --- /dev/null +++ b/src/soc/intel/skylake/romstage/smbus.c @@ -0,0 +1,54 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2008-2009 coresystems GmbH + * Copyright (C) 2014 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 <console/console.h> +#include <device/pci_ids.h> +#include <device/pci_def.h> +#include <reg_script.h> +#include <soc/iomap.h> +#include <soc/pci_devs.h> +#include <soc/smbus.h> +#include <soc/romstage.h> + +static const struct reg_script smbus_init_script[] = { + /* Set SMBUS I/O base address */ + REG_PCI_WRITE32(SMB_BASE, SMBUS_BASE_ADDRESS | 1), + /* Set SMBUS enable */ + REG_PCI_WRITE8(HOSTC, HST_EN), + /* Enable I/O access */ + REG_PCI_WRITE16(PCI_COMMAND, PCI_COMMAND_IO), + /* Disable interrupts */ + REG_IO_WRITE8(SMBUS_BASE_ADDRESS + SMBHSTCTL, 0), + /* Clear errors */ + REG_IO_WRITE8(SMBUS_BASE_ADDRESS + SMBHSTSTAT, 0xff), + /* Indicate the end of this array by REG_SCRIPT_END */ + REG_SCRIPT_END, +}; + +void enable_smbus(void) +{ + reg_script_run_on_dev(PCH_DEV_SMBUS, smbus_init_script); +} + +int smbus_read_byte(unsigned device, unsigned address) +{ + return do_smbus_read_byte(SMBUS_BASE_ADDRESS, device, address); +} |