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/*
* This file is part of the coreboot project.
*
* 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 <cpu/x86/tsc.h>
#include <broadwell/iomap.h>
#include <broadwell/lpc.h>
#include <broadwell/pci_devs.h>
#include <broadwell/rcba.h>
#include <broadwell/spi.h>
static void store_initial_timestamp(void)
{
/* Two 32bit scratchpad registers available:
* D0:F0 0xdc (SKPAD)
* D31:F2 0xd0 (SATA SP)
*/
tsc_t tsc = rdtsc();
pci_write_config32(SA_DEV_ROOT, 0xdc, tsc.lo);
pci_write_config32(PCH_DEV_SATA, 0xd0, tsc.hi);
}
/*
* Enable Prefetching and Caching.
*/
static void enable_spi_prefetch(void)
{
u8 reg8 = pci_read_config8(PCH_DEV_LPC, 0xdc);
reg8 &= ~(3 << 2);
reg8 |= (2 << 2); /* Prefetching and Caching Enabled */
pci_write_config8(PCH_DEV_LPC, 0xdc, reg8);
}
static void map_rcba(void)
{
pci_write_config32(PCH_DEV_LPC, RCBA, RCBA_BASE_ADDRESS | 1);
}
static void enable_port80_on_lpc(void)
{
/* Enable port 80 POST on LPC. The chipset does this by deafult,
* but it doesn't appear to hurt anything. */
u32 gcs = RCBA32(GCS);
gcs = gcs & ~0x4;
RCBA32(GCS) = gcs;
}
static void set_spi_speed(void)
{
u32 fdod;
u8 ssfc;
/* Observe SPI Descriptor Component Section 0 */
SPIBAR32(SPIBAR_FDOC) = 0x1000;
/* Extract the Write/Erase SPI Frequency from descriptor */
fdod = SPIBAR32(SPIBAR_FDOD);
fdod >>= 24;
fdod &= 7;
/* Set Software Sequence frequency to match */
ssfc = SPIBAR8(SPIBAR_SSFC + 2);
ssfc &= ~7;
ssfc |= fdod;
SPIBAR8(SPIBAR_SSFC + 2) = ssfc;
}
static void bootblock_southbridge_init(void)
{
#if CONFIG_COLLECT_TIMESTAMPS
store_initial_timestamp();
#endif
map_rcba();
enable_spi_prefetch();
enable_port80_on_lpc();
set_spi_speed();
}
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