OMAP4: SMC: add rproc interface for calling smc services

A thin wrapper is added to provide the interface for the rproc
driver to call into the SMC services. These services basically
allow the M3 image to be authenticated and have either the
firewalls installed or uninstalled.

Change-Id: I5d0bac6a5d73c28e1deb6a7c9e486de011842b79
Signed-off-by: Suman Anna <s-anna@ti.com>

1 files changed, 116 insertions, 0 deletions

diff --git a/security/smc/rproc_drm.c b/security/smc/rproc_drm.c
new file mode 100644
index 0000000..b2c7efc
--- /dev/null
+++ b/security/smc/rproc_drm.c
@@ -0,0 +1,116 @@
+/*
+ * Copyright (c) 2011 Texas Instruments Inc
+ * Copyright (c) 2011 Trusted Logic S.A.
+ * All Rights Reserved.
+ *
+ * This software is the confidential and proprietary information of
+ * Trusted Logic S.A. ("Confidential Information"). You shall not
+ * disclose such Confidential Information and shall use it only in
+ * accordance with the terms of the license agreement you entered
+ * into with Trusted Logic S.A.
+ *
+ * TRUSTED LOGIC S.A. MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE
+ * SUITABILITY OF THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING
+ * BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. TRUSTED LOGIC S.A. SHALL
+ * NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING,
+ * MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES.
+ */
+
+/*
+ * This file implements the non-secure rproc and smc interface/integration
+ */
+
+#include <linux/types.h>
+#include <linux/module.h>
+
+#include "tee_client_api.h"
+#include "tf_defs.h"
+
+/* 7B1DD682-1077-4939-9755-B6192C5CC5FD */
+#define WVDRM_UUID {0x7B1DD682, 0x1077, 0x4939, \
+			{0x97, 0x55, 0xB6, 0x19, 0x2C, 0x5C, 0xC5, 0xFD} }
+
+#define WVDRM_ENTER_SECURE_PLAYBACK	0x00003000
+
+#define WVDRM_EXIT_SECURE_PLAYBACK	0x00003001
+
+enum rproc_drm_s_state {
+	RPROC_DRM_SECURE_LEAVE,
+	RPROC_DRM_SECURE_ENTER
+};
+
+static enum rproc_drm_s_state s_state;
+
+static TEEC_Result rproc_drm_initialize(TEEC_Context *teec_context,
+					TEEC_Session *teec_session)
+{
+	static const TEEC_UUID drm_uuid = WVDRM_UUID;
+	static u32 drm_gid = 1019;
+	TEEC_Result result;
+
+	result = TEEC_InitializeContext(NULL, teec_context);
+	if (result != TEEC_SUCCESS)
+		goto exit;
+
+	result = TEEC_OpenSession(teec_context, teec_session, &drm_uuid,
+			TEEC_LOGIN_PRIVILEGED, &drm_gid, NULL, NULL);
+	if (result != TEEC_SUCCESS)
+		TEEC_FinalizeContext(teec_context);
+
+exit:
+	return result;
+}
+
+static TEEC_Result rproc_drm_finalize(TEEC_Context *teec_context,
+					TEEC_Session *teec_session)
+{
+	TEEC_CloseSession(teec_session);
+	TEEC_FinalizeContext(teec_context);
+	return TEEC_SUCCESS;
+}
+
+static TEEC_Result _rproc_drm_invoke_secure_service(bool enable)
+{
+	TEEC_Result result;
+	TEEC_Operation operation;
+	TEEC_Context teec_context;
+	TEEC_Session teec_session;
+	u32 command;
+
+	result = rproc_drm_initialize(&teec_context, &teec_session);
+	if (result != TEEC_SUCCESS)
+		goto out;
+
+	/*
+	 * TODO: Check with security team if we need to pass a parameter to get
+	 * the result of the service, or the actual return value is enough
+	 */
+	operation.paramTypes = TEEC_PARAM_TYPES(TEEC_NONE, TEEC_NONE,
+						TEEC_NONE, TEEC_NONE);
+	command = (enable ? WVDRM_ENTER_SECURE_PLAYBACK :
+				WVDRM_EXIT_SECURE_PLAYBACK);
+	result = TEEC_InvokeCommand(&teec_session, command, &operation, NULL);
+	rproc_drm_finalize(&teec_context, &teec_session);
+out:
+	return result;
+}
+
+int rproc_drm_invoke_service(bool enable)
+{
+	int ret;
+
+	/*
+	 * TODO: Need to analyze if we get different errors for
+	 * failures in authentication or firewalling
+	 */
+	if ((s_state == RPROC_DRM_SECURE_ENTER && enable) ||
+		(s_state == RPROC_DRM_SECURE_LEAVE && !enable))
+		return 0;
+
+	ret = _rproc_drm_invoke_secure_service(enable);
+	s_state = (enum rproc_drm_s_state) enable;
+
+	return ret == TEEC_SUCCESS ? 0 : -EACCES;
+}
+EXPORT_SYMBOL(rproc_drm_invoke_service);