This is based on wait_startup() from the Linux tpm_tis driver.
Signed-off-by: Stephen Douthit <steph...@silicom-usa.com>
Tested-by: Stephen Douthit <steph...@silicom-usa.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))
--
2.14.3
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