This enables TPM Command Response Buffer interface driver for
ARM64 and implements an ARM specific TPM CRB start method that
invokes a Secure Monitor Call to request the Firmware to execute
or cancel a TPM 2.0 command.
Signed-off-by: Jiandi An <anjia...@codeaurora.org>
---
drivers/char/tpm/Kconfig | 2 +-
drivers/char/tpm/tpm_crb.c | 24 ++++++++++++++++++++++--
2 files changed, 23 insertions(+), 3 deletions(-)
diff --git a/drivers/char/tpm/Kconfig b/drivers/char/tpm/Kconfig
index d520ac5..9659f40 100644
--- a/drivers/char/tpm/Kconfig
+++ b/drivers/char/tpm/Kconfig
@@ -136,7 +136,7 @@ config TCG_XEN
config TCG_CRB
tristate "TPM 2.0 CRB Interface"
- depends on X86 && ACPI
+ depends on (X86 || ARM64) && ACPI
---help---
If you have a TPM security chip that is compliant with the
TCG CRB 2.0 TPM specification say Yes and it will be accessible
diff --git a/drivers/char/tpm/tpm_crb.c b/drivers/char/tpm/tpm_crb.c
index 089fcf8..d29a84a 100644
--- a/drivers/char/tpm/tpm_crb.c
+++ b/drivers/char/tpm/tpm_crb.c
@@ -73,6 +73,7 @@ enum crb_status {
enum crb_flags {
CRB_FL_ACPI_START = BIT(0),
CRB_FL_CRB_START = BIT(1),
+ CRB_FL_CRB_SMC_START = BIT(2),
};
struct crb_priv {
@@ -82,6 +83,7 @@ struct crb_priv {
u8 __iomem *cmd;
u8 __iomem *rsp;
u32 cmd_size;
+ u32 smc_func_id;
};
/**
@@ -101,7 +103,8 @@ struct crb_priv {
*/
static int __maybe_unused crb_go_idle(struct device *dev, struct crb_priv
*priv)
{
- if (priv->flags & CRB_FL_ACPI_START)
+ if ((priv->flags & CRB_FL_ACPI_START) ||
+ (priv->flags & CRB_FL_CRB_SMC_START))
return 0;
iowrite32(CRB_CTRL_REQ_GO_IDLE, &priv->cca->req);
@@ -129,7 +132,8 @@ static int __maybe_unused crb_cmd_ready(struct device *dev,
{
ktime_t stop, start;
- if (priv->flags & CRB_FL_ACPI_START)
+ if ((priv->flags & CRB_FL_ACPI_START) ||
+ (priv->flags & CRB_FL_CRB_SMC_START))
return 0;
iowrite32(CRB_CTRL_REQ_CMD_READY, &priv->cca->req);
@@ -229,6 +233,11 @@ static int crb_send(struct tpm_chip *chip, u8 *buf, size_t
len)
if (priv->flags & CRB_FL_ACPI_START)
rc = crb_do_acpi_start(chip);
+ if (priv->flags & CRB_FL_CRB_SMC_START) {
+ iowrite32(CRB_START_INVOKE, &priv->cca->start);
+ rc = tpm_crb_smc_start(priv->smc_func_id);
+ }
+
return rc;
}
@@ -445,6 +454,17 @@ static int crb_acpi_add(struct acpi_device *device)
sm == ACPI_TPM2_COMMAND_BUFFER_WITH_START_METHOD)
priv->flags |= CRB_FL_ACPI_START;
+ if (sm == ACPI_TPM2_COMMAND_BUFFER_WITH_SMC) {
+ if ((buf->header.length - default_len) !=
+ sizeof(struct tpm2_crb_smc)) {
+ dev_err(dev, "TPM2 ACPI table has wrong size %u for
start method type %d\n",
+ buf->header.length,
ACPI_TPM2_COMMAND_BUFFER_WITH_SMC);
+ return -EINVAL;
+ }
+ priv->flags |= CRB_FL_CRB_SMC_START;
+ priv->smc_func_id = buf->platform_data.smc_params.smc_func_id;
+ }
+
rc = crb_map_io(device, priv, buf);
if (rc)
return rc;
--
Jiandi An
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm
Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux
Foundation Collaborative Project.
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