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tpm: cr50: Check for valid locality

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When the Cr50 starts up it doesn't have a valid locality. The driver sets
it to -1 to indicate that. Tracking this allows cr50_i2c_cleanup() to
avoid releasing a locality that was not claimed.

However the helper functions that generate the flags use a u8 type which
cannot support -1, so they return a locality of 0xff.

Fix this by updating the type. With this, 'tpm startup TPM2_SU_CLEAR'
works as expected.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2020-12-31 09:52:12 -07:00
parent 472a716b8f
commit 6208975e23
1 changed files with 12 additions and 4 deletions
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16
drivers/tpm/cr50_i2c.c
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@ -183,23 +183,31 @@ static int cr50_i2c_write(struct udevice *dev, u8 addr, const u8 *buffer,
return cr50_i2c_wait_tpm_ready(dev);
}
static inline u8 tpm_access(u8 locality)
static inline u8 tpm_access(int locality)
{
if (locality == -1)
locality = 0;
return 0x0 | (locality << 4);
}
static inline u8 tpm_sts(u8 locality)
static inline u8 tpm_sts(int locality)
{
if (locality == -1)
locality = 0;
return 0x1 | (locality << 4);
}
static inline u8 tpm_data_fifo(u8 locality)
static inline u8 tpm_data_fifo(int locality)
{
if (locality == -1)
locality = 0;
return 0x5 | (locality << 4);
}
static inline u8 tpm_did_vid(u8 locality)
static inline u8 tpm_did_vid(int locality)
{
if (locality == -1)
locality = 0;
return 0x6 | (locality << 4);
}