[SeaBIOS] [PATCH v1 2/3] tpm: Wait for interface startup when probing
Stefan Berger
stefanb at linux.vnet.ibm.com
Tue Feb 27 22:00:55 CET 2018
On 02/27/2018 02:17 PM, Stephen Douthit wrote:
> This is based on wait_startup() from the Linux tpm_tis driver.
>
> Signed-off-by: Stephen Douthit <stephend at silicom-usa.com>
> Tested-by: Stephen Douthit <stephend at silicom-usa.com>
Reviewed-by: Stefan Berger <stefanb at linux.vnet.ibm.com>
> ---
> src/hw/tpm_drivers.c | 13 ++++++++++++-
> 1 file changed, 12 insertions(+), 1 deletion(-)
>
> diff --git a/src/hw/tpm_drivers.c b/src/hw/tpm_drivers.c
> index 13ad821..da8bb63 100644
> --- a/src/hw/tpm_drivers.c
> +++ b/src/hw/tpm_drivers.c
> @@ -86,6 +86,11 @@ static u32 wait_reg8(u8* reg, u32 time, u8 mask, u8 expect)
> return rc;
> }
>
> +static u32 tis_wait_access(u8 locty, u32 time, u8 mask, u8 expect)
> +{
> + return wait_reg8(TIS_REG(locty, TIS_REG_ACCESS), time, mask, expect);
> +}
> +
> static u32 tis_wait_sts(u8 locty, u32 time, u8 mask, u8 expect)
> {
> return wait_reg8(TIS_REG(locty, TIS_REG_STS), time, mask, expect);
> @@ -102,7 +107,13 @@ static u32 tis_probe(void)
> if (!CONFIG_TCGBIOS)
> return 0;
>
> - u32 rc = 0;
> + /* Wait for the interface to report it's ready */
> + u32 rc = tis_wait_access(0, TIS_DEFAULT_TIMEOUT_A,
> + TIS_ACCESS_TPM_REG_VALID_STS,
> + TIS_ACCESS_TPM_REG_VALID_STS);
> + if (rc)
> + return 0;
> +
> u32 didvid = readl(TIS_REG(0, TIS_REG_DID_VID));
>
> if ((didvid != 0) && (didvid != 0xffffffff))
More information about the SeaBIOS
mailing list