diff options
Diffstat (limited to 'src/drivers/tpm')
| -rw-r--r-- | src/drivers/tpm/cr50.c | 16 | ||||
| -rw-r--r-- | src/drivers/tpm/cr50.h | 3 |
2 files changed, 19 insertions, 0 deletions
diff --git a/src/drivers/tpm/cr50.c b/src/drivers/tpm/cr50.c index 887cf767b7..1724b8d0f6 100644 --- a/src/drivers/tpm/cr50.c +++ b/src/drivers/tpm/cr50.c @@ -3,6 +3,7 @@ #include <drivers/spi/tpm/tpm.h> #include <security/tpm/tis.h> #include <string.h> +#include <timer.h> #include <types.h> #define CR50_DID_VID 0x00281ae0L @@ -234,3 +235,18 @@ success: *version = cr50_firmware_version; return CB_SUCCESS; } + +enum cb_err cr50_wait_tpm_ready(void) +{ + struct stopwatch sw; + + stopwatch_init_msecs_expire(&sw, CONFIG_GOOGLE_TPM_IRQ_TIMEOUT_MS); + + while (!tis_plat_irq_status()) + if (stopwatch_expired(&sw)) { + printk(BIOS_ERR, "Cr50 TPM IRQ timeout!\n"); + return CB_ERR; + } + + return CB_SUCCESS; +} diff --git a/src/drivers/tpm/cr50.h b/src/drivers/tpm/cr50.h index b39d7442c5..7ff63fa3c7 100644 --- a/src/drivers/tpm/cr50.h +++ b/src/drivers/tpm/cr50.h @@ -21,4 +21,7 @@ enum cb_err cr50_get_firmware_version(struct cr50_firmware_version *version); /* Set the BOARD_CFG register depending on Cr50 Kconfigs */ enum cb_err cr50_set_board_cfg(void); +/* Wait for IRQ to indicate the TPM is ready */ +enum cb_err cr50_wait_tpm_ready(void); + #endif /* __DRIVERS_TPM_CR50_H__ */ |