drivers/crb/tpm: Add new method to retrieve base address

In order to support runtime evaluation of the TPM base address
introduce and use a new method for CRB TPMs.

Change-Id: I29c81d82947eb2603472a515f9ada598e4f8e6ea
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/88249
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <inforichland@gmail.com>

src/acpi/acpi.c

@@ -281,7 +281,7 @@ static void acpi_create_tpm2(acpi_header_t *header, void *unused)
 	tpm2->platform_class = 0;
 	if (CONFIG(CRB_TPM)) {
 		/* Must be set to 7 for CRB Support */
-		tpm2->control_area = CONFIG_CRB_TPM_BASE_ADDRESS + 0x40;
+		tpm2->control_area = crb_tpm_base_address() + 0x40;
 		tpm2->start_method = 7;
 	} else {
 		/* Must be set to 0 for FIFO interface support */

src/drivers/crb/tpm.c

@@ -346,3 +346,13 @@ bool crb_tpm_is_active(void)
 
 	return true;
 }
+
+/*
+ * crb_tpm_base_address
+ *
+ * Returns the CRB TPM base address.
+ */
+uintptr_t crb_tpm_base_address(void)
+{
+	return CONFIG_CRB_TPM_BASE_ADDRESS;
+}

src/drivers/crb/tpm.h

@@ -68,3 +68,5 @@ size_t crb_tpm_process_command(const void *tpm2_command, size_t command_size,
 bool crb_tpm_is_active(void);
 
 tis_sendrecv_fn crb_tis_probe(enum tpm_family *family);
+
+uintptr_t crb_tpm_base_address(void);