[PATCH 5/8] msm: scm: Add API to query for service/command availability.

[Stephen Boyd <sboyd@codeaurora.org>]

From: Saravana Kannan <skannan@codeaurora.org>

Some drivers may need to query the secure environment about the
availability of a particular service/command. Add support for
this.

Signed-off-by: Saravana Kannan <skannan@codeaurora.org>
[sboyd@codeaurora.org: Add some commit text]

Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
---
 arch/arm/mach-qcom/scm.c | 18 +++++++++++++++++-
 arch/arm/mach-qcom/scm.h |  2 ++
 2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/arch/arm/mach-qcom/scm.c b/arch/arm/mach-qcom/scm.c
index a05cad3fa1c5..e80571f57ca4 100644
--- a/arch/arm/mach-qcom/scm.c
+++ b/arch/arm/mach-qcom/scm.c
@@ -1,4 +1,4 @@
-/* Copyright (c) 2010, Code Aurora Forum. All rights reserved.
+/* Copyright (c) 2010-2014, The Linux Foundation. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and
@@ -394,3 +394,19 @@ u32 scm_get_version(void)
 	return version;
 }
 EXPORT_SYMBOL(scm_get_version);
+
+#define IS_CALL_AVAIL_CMD	1
+int scm_is_call_available(u32 svc_id, u32 cmd_id)
+{
+	int ret;
+	u32 svc_cmd = (svc_id << 10) | cmd_id;
+	u32 ret_val = 0;
+
+	ret = scm_call(SCM_SVC_INFO, IS_CALL_AVAIL_CMD, &svc_cmd,
+			sizeof(svc_cmd), &ret_val, sizeof(ret_val));
+	if (ret)
+		return ret;
+
+	return ret_val;
+}
+EXPORT_SYMBOL(scm_is_call_available);
diff --git a/arch/arm/mach-qcom/scm.h b/arch/arm/mach-qcom/scm.h
index 1f0f0180e767..f94c7279616a 100644
--- a/arch/arm/mach-qcom/scm.h
+++ b/arch/arm/mach-qcom/scm.h
@@ -14,6 +14,7 @@
 
 #define SCM_SVC_BOOT			0x1
 #define SCM_SVC_PIL			0x2
+#define SCM_SVC_INFO			0x6
 
 extern int scm_call(u32 svc_id, u32 cmd_id, const void *cmd_buf, size_t cmd_len,
 		void *resp_buf, size_t resp_len);
@@ -24,5 +25,6 @@ extern s32 scm_call_atomic2(u32 svc, u32 cmd, u32 arg1, u32 arg2);
 #define SCM_VERSION(major, minor) (((major) << 16) | ((minor) & 0xFF))
 
 extern u32 scm_get_version(void);
+extern int scm_is_call_available(u32 svc_id, u32 cmd_id);
 
 #endif
-- 
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