1 files changed, 113 insertions, 0 deletions
diff --git a/drivers/auth/cryptocell/712/cryptocell_plat_helpers.c b/drivers/auth/cryptocell/712/cryptocell_plat_helpers.c
new file mode 100644
index 0000000..53d77db
--- /dev/null
+++ b/drivers/auth/cryptocell/712/cryptocell_plat_helpers.c
@@ -0,0 +1,113 @@
+/*
+ * Copyright (c) 2017-2019, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+#include <stddef.h>
+#include <string.h>
+
+#include <platform_def.h>
+
+#include <plat/common/platform.h>
+#include <tools_share/tbbr_oid.h>
+
+#include <common/debug.h>
+#include <drivers/arm/cryptocell/712/sbrom_bsv_api.h>
+#include <drivers/arm/cryptocell/712/nvm.h>
+#include <drivers/arm/cryptocell/712/nvm_otp.h>
+
+/*
+ * Return the ROTPK hash
+ *
+ * dst:   buffer into which the ROTPK hash will be copied into
+ * len:   length of the provided buffer, which must be at least enough for a
+ *        SHA256 hash
+ * flags: a pointer to integer that will be set to indicate the ROTPK status
+ *
+ * Return: 0 = success, Otherwise = error
+ */
+int cc_get_rotpk_hash(unsigned char *dst, unsigned int len, unsigned int *flags)
+{
+	CCError_t error;
+	uint32_t lcs;
+
+	assert(dst != NULL);
+	assert(len >= HASH_RESULT_SIZE_IN_WORDS);
+	assert(flags != NULL);
+
+	error = NVM_GetLCS(PLAT_CRYPTOCELL_BASE, &lcs);
+	if (error != CC_OK)
+		return 1;
+
+	/* If the lifecycle state is `SD`, return failure */
+	if (lcs == CC_BSV_SECURITY_DISABLED_LCS)
+		return 1;
+
+	/*
+	 * If the lifecycle state is `CM` or `DM`, ROTPK shouldn't be verified.
+	 * Return success after setting ROTPK_NOT_DEPLOYED flag
+	 */
+	if ((lcs == CC_BSV_CHIP_MANUFACTURE_LCS) ||
+			(lcs == CC_BSV_DEVICE_MANUFACTURE_LCS)) {
+		*flags = ROTPK_NOT_DEPLOYED;
+		return 0;
+	}
+
+	/* Copy the DER header */
+	error = NVM_ReadHASHPubKey(PLAT_CRYPTOCELL_BASE,
+			CC_SB_HASH_BOOT_KEY_256B,
+			(uint32_t *)dst, HASH_RESULT_SIZE_IN_WORDS);
+	if (error != CC_OK)
+		return 1;
+
+	*flags = ROTPK_IS_HASH;
+	return 0;
+}
+
+/*
+ * Return the non-volatile counter value stored in the platform. The cookie
+ * specifies the OID of the counter in the certificate.
+ *
+ * Return: 0 = success, Otherwise = error
+ */
+int plat_get_nv_ctr(void *cookie, unsigned int *nv_ctr)
+{
+	CCError_t error = CC_FAIL;
+
+	if (strcmp(cookie, TRUSTED_FW_NVCOUNTER_OID) == 0) {
+		error = NVM_GetSwVersion(PLAT_CRYPTOCELL_BASE,
+				CC_SW_VERSION_COUNTER1, nv_ctr);
+	} else if (strcmp(cookie, NON_TRUSTED_FW_NVCOUNTER_OID) == 0) {
+		error = NVM_GetSwVersion(PLAT_CRYPTOCELL_BASE,
+				CC_SW_VERSION_COUNTER2, nv_ctr);
+	}
+
+	return (error != CC_OK);
+}
+
+/*
+ * Store a new non-volatile counter value in the counter specified by the OID
+ * in the cookie. This function is not expected to be called if the Lifecycle
+ * state is RMA as the values in the certificate are expected to always match
+ * the nvcounter values. But if called when the LCS is RMA, the underlying
+ * helper functions will return success but without updating the counter.
+ *
+ * Return: 0 = success, Otherwise = error
+ */
+int plat_set_nv_ctr(void *cookie, unsigned int nv_ctr)
+{
+	CCError_t error = CC_FAIL;
+
+	if (strcmp(cookie, TRUSTED_FW_NVCOUNTER_OID) == 0) {
+		error = NVM_SetSwVersion(PLAT_CRYPTOCELL_BASE,
+				CC_SW_VERSION_COUNTER1, nv_ctr);
+	} else if (strcmp(cookie, NON_TRUSTED_FW_NVCOUNTER_OID) == 0) {
+		error = NVM_SetSwVersion(PLAT_CRYPTOCELL_BASE,
+				CC_SW_VERSION_COUNTER2, nv_ctr);
+	}
+
+	return (error != CC_OK);
+}
+