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intel/i82801gx: Store initial timestamp 

Upgrade the ICH7 bootblock to store an initial timestamp like we do it
since Sandy Brigde. I've checked the datasheets for the used scratchpad
registers and grepped for their usage. I'm pretty sure that they aren't
used on any ICH7 based board (for anything before the usual S3-resume
indication).

Change-Id: I28a9b90d3e6f6401a8114ecd240554a5dddc0eb5
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: http://review.coreboot.org/3498
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
This commit is contained in:
Nico Huber 2013-06-18 22:36:34 +02:00 committed by Ronald G. Minnich
parent 414b947851
commit 9359f2de00
1 changed files with 15 additions and 0 deletions
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15
src/southbridge/intel/i82801gx/bootblock.c
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@ -18,6 +18,18 @@
*/
#include <arch/io.h>
#include <cpu/x86/tsc.h>
static void store_initial_timestamp(void)
{
/* On i945/ICH7 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)
{
@ -34,6 +46,9 @@ static void enable_spi_prefetch(void)
static void bootblock_southbridge_init(void)
{
#if CONFIG_COLLECT_TIMESTAMPS
store_initial_timestamp();
#endif
enable_spi_prefetch();
}