Add a TPM Command Response Buffer start method that invokes
a secure Monitor Call to request the firmware to execute or
cancel a TPM 2.0 command for ARM64.
Signed-off-by: Jiandi An <anjia...@codeaurora.org>
---
drivers/char/tpm/tpm.h | 29 +++++++++++++++++++++++++++++
1 file changed, 29 insertions(+)
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index 4937b56..4341594 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -35,6 +35,9 @@
#include <linux/cdev.h>
#include <linux/highmem.h>
#include <crypto/hash_info.h>
+#ifdef CONFIG_ARM64
+#include <linux/arm-smccc.h>
+#endif
enum tpm_const {
TPM_MINOR = 224, /* officially assigned */
@@ -484,6 +487,32 @@ static inline void tpm_buf_append_u32(struct tpm_buf *buf,
const u32 value)
tpm_buf_append(buf, (u8 *) &value2, 4);
}
+#ifdef CONFIG_ARM64
+/*
+ * This is a TPM Command Response Buffer start method that invokes a
+ * Secure Monitor Call to requrest the firmware to execute or cancel
+ * a TPM 2.0 command.
+ */
+static inline int tpm_crb_smc_start(unsigned long func_id)
+{
+ struct arm_smccc_res res;
+
+ arm_smccc_smc(func_id, 0, 0, 0, 0, 0, 0, 0, &res);
+ if (res.a0 != 0) {
+ WARN(1, "tpm_crb_smc_start() returns res.a0 = 0x%lx\n", res.a0);
+ return -EIO;
+ }
+
+ return 0;
+}
+#else
+static inline int tpm_crb_smc_start(unsigned long func_id)
+{
+ WARN(1, "tpm_crb: incorrect start method\n");
+ return -EINVAL;
+}
+#endif
+
extern struct class *tpm_class;
extern dev_t tpm_devt;
extern const struct file_operations tpm_fops;
--
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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