Simplify tpm_read_log_of() by moving Openfirmware-specific code into
the Openfirmware driver to make the code reusable. Call the new
of_tpm_get_sml_parameters() function from the TPM Openfirmware driver.
Signed-off-by: Stefan Berger <stefanb@xxxxxxxxxxxxx>
Cc: Jarkko Sakkinen <jarkko@xxxxxxxxxx>
Cc: Jason Gunthorpe <jgg@xxxxxxxx>
Cc: Rob Herring <robh+dt@xxxxxxxxxx>
Cc: Frank Rowand <frowand.list@xxxxxxxxx>
---
drivers/char/tpm/eventlog/of.c | 31 +++++--------------------------
drivers/of/Makefile | 2 +-
drivers/of/device_node.c | 27 +++++++++++++++++++++++++++
include/linux/of_device_node.h | 9 +++++++++
4 files changed, 42 insertions(+), 27 deletions(-)
create mode 100644 drivers/of/device_node.c
create mode 100644 include/linux/of_device_node.h
diff --git a/drivers/char/tpm/eventlog/of.c b/drivers/char/tpm/eventlog/of.c
index a9ce66d09a75..5b18f4333ad1 100644
--- a/drivers/char/tpm/eventlog/of.c
+++ b/drivers/char/tpm/eventlog/of.c
@@ -12,6 +12,7 @@
#include <linux/slab.h>
#include <linux/of.h>
+#include <linux/of_device_node.h>
#include <linux/tpm_eventlog.h>
#include "../tpm.h"
@@ -20,11 +21,10 @@
int tpm_read_log_of(struct tpm_chip *chip)
{
struct device_node *np;
- const u32 *sizep;
- const u64 *basep;
struct tpm_bios_log *log;
u32 size;
u64 base;
+ int ret;
log = &chip->log;
if (chip->dev.parent && chip->dev.parent->of_node)
@@ -35,30 +35,9 @@ int tpm_read_log_of(struct tpm_chip *chip)
if (of_property_read_bool(np, "powered-while-suspended"))
chip->flags |= TPM_CHIP_FLAG_ALWAYS_POWERED;
- sizep = of_get_property(np, "linux,sml-size", NULL);
- basep = of_get_property(np, "linux,sml-base", NULL);
- if (sizep == NULL && basep == NULL)
- return -ENODEV;
- if (sizep == NULL || basep == NULL)
- return -EIO;
-
- /*
- * For both vtpm/tpm, firmware has log addr and log size in big
- * endian format. But in case of vtpm, there is a method called
- * sml-handover which is run during kernel init even before
- * device tree is setup. This sml-handover function takes care
- * of endianness and writes to sml-base and sml-size in little
- * endian format. For this reason, vtpm doesn't need conversion
- * but physical tpm needs the conversion.
- */
- if (of_property_match_string(np, "compatible", "IBM,vtpm") < 0 &&
- of_property_match_string(np, "compatible", "IBM,vtpm20") < 0) {
- size = be32_to_cpup((__force __be32 *)sizep);
- base = be64_to_cpup((__force __be64 *)basep);
- } else {
- size = *sizep;
- base = *basep;
- }
+ ret = of_tpm_get_sml_parameters(np, &base, &size);
+ if (ret < 0)
+ return ret;
if (size == 0) {
dev_warn(&chip->dev, "%s: Event log area empty\n", __func__);
diff --git a/drivers/of/Makefile b/drivers/of/Makefile
index e0360a44306e..1c9feac450ad 100644
--- a/drivers/of/Makefile
+++ b/drivers/of/Makefile
@@ -1,5 +1,5 @@
# SPDX-License-Identifier: GPL-2.0
-obj-y = base.o device.o platform.o property.o
+obj-y = base.o device.o platform.o property.o device_node.o
obj-$(CONFIG_OF_KOBJ) += kobj.o
obj-$(CONFIG_OF_DYNAMIC) += dynamic.o
obj-$(CONFIG_OF_FLATTREE) += fdt.o
diff --git a/drivers/of/device_node.c b/drivers/of/device_node.c
new file mode 100644
index 000000000000..71a19bc1bac2
--- /dev/null
+++ b/drivers/of/device_node.c
@@ -0,0 +1,27 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/export.h>
+#include <linux/of_device_node.h>
+
+int of_tpm_get_sml_parameters(struct device_node *np, u64 *base, u32 *size)
+{
+ const u32 *sizep;
+ const u64 *basep;
+
+ sizep = of_get_property(np, "linux,sml-size", NULL);
+ basep = of_get_property(np, "linux,sml-base", NULL);
+ if (sizep == NULL && basep == NULL)
+ return -ENODEV;
+ if (sizep == NULL || basep == NULL)
+ return -EIO;
+
+ if (of_property_match_string(np, "compatible", "IBM,vtpm") < 0 &&
+ of_property_match_string(np, "compatible", "IBM,vtpm20") < 0) {
+ *size = be32_to_cpup((__force __be32 *)sizep);
+ *base = be64_to_cpup((__force __be64 *)basep);
+ } else {
+ *size = *sizep;
+ *base = *basep;
+ }
+ return 0;
+}
+EXPORT_SYMBOL_GPL(of_tpm_get_sml_parameters);
diff --git a/include/linux/of_device_node.h b/include/linux/of_device_node.h
new file mode 100644
index 000000000000..ae3faf023aab
--- /dev/null
+++ b/include/linux/of_device_node.h
@@ -0,0 +1,9 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_OF_DEVICE_NODE_H
+#define _LINUX_OF_DEVICE_NODE_H
+
+#include <linux/of.h>
+
+int of_tpm_get_sml_parameters(struct device_node *np, u64 *base, u32 *size);
+
+#endif /* _LINUX_OF_DEVICE_NODE_H */
--
2.35.1
