diff options
Diffstat (limited to 'src/southbridge')
| -rw-r--r-- | src/southbridge/intel/i82801ix/bootblock.c | 14 | ||||
| -rw-r--r-- | src/southbridge/intel/i82801ix/early_init.c | 11 |
2 files changed, 25 insertions, 0 deletions
diff --git a/src/southbridge/intel/i82801ix/bootblock.c b/src/southbridge/intel/i82801ix/bootblock.c index 6252712eba..bb025b0eae 100644 --- a/src/southbridge/intel/i82801ix/bootblock.c +++ b/src/southbridge/intel/i82801ix/bootblock.c @@ -14,6 +14,19 @@ */ #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) { @@ -30,5 +43,6 @@ static void enable_spi_prefetch(void) static void bootblock_southbridge_init(void) { + store_initial_timestamp(); enable_spi_prefetch(); } diff --git a/src/southbridge/intel/i82801ix/early_init.c b/src/southbridge/intel/i82801ix/early_init.c index c40f9b73ea..7c4dafaef6 100644 --- a/src/southbridge/intel/i82801ix/early_init.c +++ b/src/southbridge/intel/i82801ix/early_init.c @@ -15,8 +15,19 @@ */ #include <arch/io.h> +#include <timestamp.h> +#include <cpu/x86/tsc.h> #include "i82801ix.h" +uint64_t get_initial_timestamp(void) +{ + tsc_t base_time = { + .lo = pci_read_config32(PCI_DEV(0, 0x00, 0), 0xdc), + .hi = pci_read_config32(PCI_DEV(0, 0x1f, 2), 0xd0) + }; + return tsc_to_uint64(base_time); +} + void i82801ix_early_init(void) { const pci_devfn_t d31f0 = PCI_DEV(0, 0x1f, 0); |