/* * This file is part of the coreboot project. * * Copyright (C) 2011 Sven Schnelle <svens@stackframe.org> * * 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. */ #include <arch/io.h> #include <cpu/x86/tsc.h> static void store_initial_timestamp(void) { /* * We have two 32bit scratchpad registers available: * D0:F0 0xdc (SKPAD) * D31:F2 0xd0 (SATA SP) */ tsc_t tsc = rdtsc(); pci_write_config32(PCI_DEV(0, 0x00, 0), 0xdc, tsc.lo); pci_write_config32(PCI_DEV(0, 0x1f, 2), 0xd0, tsc.hi); } static void enable_spi_prefetch(void) { u8 reg8; pci_devfn_t dev; dev = PCI_DEV(0, 0x1f, 0); reg8 = pci_read_config8(dev, 0xdc); reg8 &= ~(3 << 2); reg8 |= (2 << 2); /* Prefetching and Caching Enabled */ pci_write_config8(dev, 0xdc, reg8); } static void bootblock_southbridge_init(void) { store_initial_timestamp(); enable_spi_prefetch(); }