From 8f906946fe473edbbaee937e2a8b5154cd76151b Mon Sep 17 00:00:00 2001
From: Lina Iyer <ilina@codeaurora.org>
Date: Wed, 1 Feb 2017 13:34:54 -0700
Subject: [PATCH] drivers: qcom: cmd-db: Report if command DB is initialized as
 standalone

The command DB may be initialized outside the AOP, indicated by the
reserved bit 0. Export this information through a function.

Change-Id: I7b8c685cc03d919c5adb1b91134078bd96599bbd
Signed-off-by: Lina Iyer <ilina@codeaurora.org>
---
 drivers/soc/qcom/cmd-db.c | 14 ++++++++++++++
 include/soc/qcom/cmd-db.h |  5 +++++
 2 files changed, 19 insertions(+)

diff --git a/drivers/soc/qcom/cmd-db.c b/drivers/soc/qcom/cmd-db.c
index 345c4b70a6f3..344ab1de615d 100644
--- a/drivers/soc/qcom/cmd-db.c
+++ b/drivers/soc/qcom/cmd-db.c
@@ -16,6 +16,7 @@
 #define MAX_SLV_ID		8
 #define SLAVE_ID_MASK		0x7
 #define SLAVE_ID_SHIFT		16
+#define CMD_DB_STANDALONE_MASK BIT(0)
 
 /**
  * struct entry_header: header for each entry in cmddb
@@ -237,6 +238,16 @@ enum cmd_db_hw_type cmd_db_read_slave_id(const char *id)
 }
 EXPORT_SYMBOL(cmd_db_read_slave_id);
 
+bool cmd_db_is_standalone(void)
+{
+	int ret = cmd_db_ready();
+	u32 standalone = le32_to_cpu(cmd_db_header->reserved) &
+			 CMD_DB_STANDALONE_MASK;
+
+	return !ret && standalone;
+}
+EXPORT_SYMBOL(cmd_db_is_standalone);
+
 static int cmd_db_dev_probe(struct platform_device *pdev)
 {
 	struct reserved_mem *rmem;
@@ -260,6 +271,9 @@ static int cmd_db_dev_probe(struct platform_device *pdev)
 		return -EINVAL;
 	}
 
+	if (cmd_db_is_standalone())
+		pr_info("Command DB is initialized in standalone mode.\n");
+
 	return 0;
 }
 
diff --git a/include/soc/qcom/cmd-db.h b/include/soc/qcom/cmd-db.h
index c45a6b918200..308c66dc5e61 100644
--- a/include/soc/qcom/cmd-db.h
+++ b/include/soc/qcom/cmd-db.h
@@ -23,6 +23,8 @@ const void *cmd_db_read_aux_data(const char *resource_id, size_t *len);
 enum cmd_db_hw_type cmd_db_read_slave_id(const char *resource_id);
 
 int cmd_db_ready(void);
+
+bool cmd_db_is_standalone(void);
 #else
 static inline u32 cmd_db_read_addr(const char *resource_id)
 { return 0; }
@@ -35,5 +37,8 @@ static inline enum cmd_db_hw_type cmd_db_read_slave_id(const char *resource_id)
 
 static inline int cmd_db_ready(void)
 { return -ENODEV; }
+
+static inline bool cmd_db_is_standalone(void)
+{ return false; }
 #endif /* CONFIG_QCOM_COMMAND_DB */
 #endif /* __QCOM_COMMAND_DB_H__ */