[RFC v2 1/7] hw/tpm: Add TPM CRB chunking fields

[Arun Menon <armenon@redhat.com>]

- Add new fields to the CRB Interface Identifier and the CRB
  Control Start registers.
- CRB_CTRL_START now has 2 new settings, that can be toggled using the
  nextChunk and crbRspRetry bits.
- CapCRBChunk bit (10) was Reserved1 previously. The field is reused in
  this revision of the specification.
- Refer to section 6.4.2.2 of [1]

[1] https://trustedcomputinggroup.org/wp-content/uploads/PC-Client-Specific-Platform-TPM-Profile-for-TPM-2p0-v1p07_rc1_121225.pdf

Signed-off-by: Arun Menon <armenon@redhat.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
---
 hw/tpm/tpm_crb.c      | 3 +++
 include/hw/acpi/tpm.h | 5 ++++-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/hw/tpm/tpm_crb.c b/hw/tpm/tpm_crb.c
index 8723536f93..0a1c7ecdc6 100644
--- a/hw/tpm/tpm_crb.c
+++ b/hw/tpm/tpm_crb.c
@@ -59,6 +59,7 @@ DECLARE_INSTANCE_CHECKER(CRBState, CRB,
 #define CRB_INTF_CAP_FIFO_NOT_SUPPORTED 0b0
 #define CRB_INTF_CAP_CRB_SUPPORTED 0b1
 #define CRB_INTF_IF_SELECTOR_CRB 0b1
+#define CRB_INTF_CAP_CRB_CHUNK 0b1
 
 #define CRB_CTRL_CMD_SIZE (TPM_CRB_ADDR_SIZE - A_CRB_DATA_BUFFER)
 
@@ -262,6 +263,8 @@ static void tpm_crb_reset(void *dev)
                      CapCRB, CRB_INTF_CAP_CRB_SUPPORTED);
     ARRAY_FIELD_DP32(s->regs, CRB_INTF_ID,
                      InterfaceSelector, CRB_INTF_IF_SELECTOR_CRB);
+    ARRAY_FIELD_DP32(s->regs, CRB_INTF_ID,
+                     CapCRBChunk, CRB_INTF_CAP_CRB_CHUNK);
     ARRAY_FIELD_DP32(s->regs, CRB_INTF_ID,
                      RID, 0b0000);
     ARRAY_FIELD_DP32(s->regs, CRB_INTF_ID2,
diff --git a/include/hw/acpi/tpm.h b/include/hw/acpi/tpm.h
index d2bf6637c5..03d452d2b5 100644
--- a/include/hw/acpi/tpm.h
+++ b/include/hw/acpi/tpm.h
@@ -149,7 +149,7 @@ REG32(CRB_INTF_ID, 0x30)
   FIELD(CRB_INTF_ID, InterfaceVersion, 4, 4)
   FIELD(CRB_INTF_ID, CapLocality, 8, 1)
   FIELD(CRB_INTF_ID, CapCRBIdleBypass, 9, 1)
-  FIELD(CRB_INTF_ID, Reserved1, 10, 1)
+  FIELD(CRB_INTF_ID, CapCRBChunk, 10, 1)
   FIELD(CRB_INTF_ID, CapDataXferSizeSupport, 11, 2)
   FIELD(CRB_INTF_ID, CapFIFO, 13, 1)
   FIELD(CRB_INTF_ID, CapCRB, 14, 1)
@@ -168,6 +168,9 @@ REG32(CRB_CTRL_STS, 0x44)
   FIELD(CRB_CTRL_STS, tpmIdle, 1, 1)
 REG32(CRB_CTRL_CANCEL, 0x48)
 REG32(CRB_CTRL_START, 0x4C)
+  FIELD(CRB_CTRL_START, invoke, 0, 1)
+  FIELD(CRB_CTRL_START, crbRspRetry, 1, 1)
+  FIELD(CRB_CTRL_START, nextChunk, 2, 1)
 REG32(CRB_INT_ENABLED, 0x50)
 REG32(CRB_INT_STS, 0x54)
 REG32(CRB_CTRL_CMD_SIZE, 0x58)
-- 
2.53.0