[PATCH v3 1/7] tpm_crb: Use the common ACPI definition of struct acpi_tpm2

[Jason Gunthorpe <jgunthorpe@obsidianresearch.com>]

include/acpi/actbl2.h is the proper place for these definitions
and the needed TPM2 ones have been there since
commit 413d4a6defe0 ("ACPICA: Update TPM2 ACPI table")

This also drops a couple of le32_to_cpu's for members of this table,
the existing swapping was not done consistently, and the definitions
in actbl2.h do not have endianness annotations, declaring that no swap
is required. Note that the TPM ACPI spec defines all of these
values to be little endian, both in crb2 and ppi.

Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Tested-by: Wilck, Martin <martin.wilck@ts.fujitsu.com>
Tested-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
---
 drivers/char/tpm/tpm.h     |  7 -------
 drivers/char/tpm/tpm_crb.c | 31 +++++++++----------------------
 drivers/char/tpm/tpm_tis.c |  2 +-
 3 files changed, 10 insertions(+), 30 deletions(-)

diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index 542a80cbfd9c..28b477e8da6a 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -128,13 +128,6 @@ enum tpm2_startup_types {
 	TPM2_SU_STATE	= 0x0001,
 };
 
-enum tpm2_start_method {
-	TPM2_START_ACPI = 2,
-	TPM2_START_FIFO = 6,
-	TPM2_START_CRB = 7,
-	TPM2_START_CRB_WITH_ACPI = 8,
-};
-
 struct tpm_chip;
 
 struct tpm_vendor_specific {
diff --git a/drivers/char/tpm/tpm_crb.c b/drivers/char/tpm/tpm_crb.c
index 8342cf51ffdc..8dd70696ebe8 100644
--- a/drivers/char/tpm/tpm_crb.c
+++ b/drivers/char/tpm/tpm_crb.c
@@ -34,14 +34,6 @@ enum crb_defaults {
 	CRB_ACPI_START_INDEX = 1,
 };
 
-struct acpi_tpm2 {
-	struct acpi_table_header hdr;
-	u16 platform_class;
-	u16 reserved;
-	u64 control_area_pa;
-	u32 start_method;
-} __packed;
-
 enum crb_ca_request {
 	CRB_CA_REQ_GO_IDLE	= BIT(0),
 	CRB_CA_REQ_CMD_READY	= BIT(1),
@@ -207,7 +199,7 @@ static const struct tpm_class_ops tpm_crb = {
 static int crb_acpi_add(struct acpi_device *device)
 {
 	struct tpm_chip *chip;
-	struct acpi_tpm2 *buf;
+	struct acpi_table_tpm2 *buf;
 	struct crb_priv *priv;
 	struct device *dev = &device->dev;
 	acpi_status status;
@@ -217,13 +209,14 @@ static int crb_acpi_add(struct acpi_device *device)
 
 	status = acpi_get_table(ACPI_SIG_TPM2, 1,
 				(struct acpi_table_header **) &buf);
-	if (ACPI_FAILURE(status)) {
-		dev_err(dev, "failed to get TPM2 ACPI table\n");
+	if (ACPI_FAILURE(status) || buf->header.length < sizeof(*buf)) {
+		dev_err(dev, FW_BUG "failed to get TPM2 ACPI table\n");
 		return -ENODEV;
 	}
 
 	/* Should the FIFO driver handle this? */
-	if (buf->start_method == TPM2_START_FIFO)
+	sm = buf->start_method;
+	if (sm == ACPI_TPM2_MEMORY_MAPPED)
 		return -ENODEV;
 
 	chip = tpmm_chip_alloc(dev, &tpm_crb);
@@ -232,11 +225,6 @@ static int crb_acpi_add(struct acpi_device *device)
 
 	chip->flags = TPM_CHIP_FLAG_TPM2;
 
-	if (buf->hdr.length < sizeof(struct acpi_tpm2)) {
-		dev_err(dev, "TPM2 ACPI table has wrong size");
-		return -EINVAL;
-	}
-
 	priv = (struct crb_priv *) devm_kzalloc(dev, sizeof(struct crb_priv),
 						GFP_KERNEL);
 	if (!priv) {
@@ -244,21 +232,20 @@ static int crb_acpi_add(struct acpi_device *device)
 		return -ENOMEM;
 	}
 
-	sm = le32_to_cpu(buf->start_method);
-
 	/* The reason for the extra quirk is that the PTT in 4th Gen Core CPUs
 	 * report only ACPI start but in practice seems to require both
 	 * ACPI start and CRB start.
 	 */
-	if (sm == TPM2_START_CRB || sm == TPM2_START_FIFO ||
+	if (sm == ACPI_TPM2_COMMAND_BUFFER || sm == ACPI_TPM2_MEMORY_MAPPED ||
 	    !strcmp(acpi_device_hid(device), "MSFT0101"))
 		priv->flags |= CRB_FL_CRB_START;
 
-	if (sm == TPM2_START_ACPI || sm == TPM2_START_CRB_WITH_ACPI)
+	if (sm == ACPI_TPM2_START_METHOD ||
+	    sm == ACPI_TPM2_COMMAND_BUFFER_WITH_START_METHOD)
 		priv->flags |= CRB_FL_ACPI_START;
 
 	priv->cca = (struct crb_control_area __iomem *)
-		devm_ioremap_nocache(dev, buf->control_area_pa, 0x1000);
+		devm_ioremap_nocache(dev, buf->control_address, 0x1000);
 	if (!priv->cca) {
 		dev_err(dev, "ioremap of the control area failed\n");
 		return -ENOMEM;
diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
index 8a3509cb10da..304323bdcaaa 100644
--- a/drivers/char/tpm/tpm_tis.c
+++ b/drivers/char/tpm/tpm_tis.c
@@ -135,7 +135,7 @@ static inline int is_fifo(struct acpi_device *dev)
 		return 0;
 	}
 
-	if (le32_to_cpu(tbl->start_method) != TPM2_START_FIFO)
+	if (tbl->start_method != ACPI_TPM2_MEMORY_MAPPED)
 		return 0;
 
 	/* TPM 2.0 FIFO */
-- 
2.1.4