[PATCH v4 1/4] soc: qcom: cmd-db: Add cmd_db_read_slave_id() & cmd_db_read_aux_data() functions

[Aswin Murugan]

Partially reverted commit "soc: qcom: cmd-db: drop unused
functions" by restoring only the cmd_db_read_slave_id() and
cmd_db_read_aux_data() functions, which were removed in that
commit. These functions are required for the RPMH Power Domain
Driver.

Signed-off-by: Balaji Selvanathan <balaji.selvanathan at oss.qualcomm.com>
Signed-off-by: Aswin Murugan <aswin.murugan at oss.qualcomm.com>
---
v4:
- Moved this change before the RPMH Power Domain Driver change

v3:
- No changes to this patch in v3

v2:
- No changes to this patch in v2
---
 drivers/soc/qcom/cmd-db.c | 45 +++++++++++++++++++++++++++++++++++++++
 include/soc/qcom/cmd-db.h |  2 ++
 2 files changed, 47 insertions(+)

diff --git a/drivers/soc/qcom/cmd-db.c b/drivers/soc/qcom/cmd-db.c
index 67be18e89f4..d0a6047b8a6 100644
--- a/drivers/soc/qcom/cmd-db.c
+++ b/drivers/soc/qcom/cmd-db.c
@@ -183,6 +183,51 @@ u32 cmd_db_read_addr(const char *id)
 }
 EXPORT_SYMBOL_GPL(cmd_db_read_addr);
 
+/**
+ * cmd_db_read_slave_id - Get the slave ID for a given resource address
+ *
+ * @id: Resource id to query the DB for version
+ *
+ * Return: cmd_db_hw_type enum on success, CMD_DB_HW_INVALID on error
+ */
+enum cmd_db_hw_type cmd_db_read_slave_id(const char *id)
+{
+	int ret;
+	const struct entry_header *ent;
+	u32 addr;
+
+	ret = cmd_db_get_header(id, &ent, NULL);
+	if (ret < 0)
+		return CMD_DB_HW_INVALID;
+
+	addr = le32_to_cpu(ent->addr);
+	return (addr >> SLAVE_ID_SHIFT) & SLAVE_ID_MASK;
+}
+
+/**
+ * cmd_db_read_aux_data() - Query command db for aux data.
+ *
+ *  @id: Resource to retrieve AUX Data on
+ *  @len: size of data buffer returned
+ *
+ *  Return: pointer to data on success, error pointer otherwise
+ */
+const void *cmd_db_read_aux_data(const char *id, size_t *len)
+{
+	int ret;
+	const struct entry_header *ent;
+	const struct rsc_hdr *rsc_hdr;
+
+	ret = cmd_db_get_header(id, &ent, &rsc_hdr);
+	if (ret)
+		return ERR_PTR(ret);
+
+	if (len)
+		*len = le16_to_cpu(ent->len);
+
+	return rsc_offset(rsc_hdr, ent);
+}
+
 static int cmd_db_bind(struct udevice *dev)
 {
 	void __iomem *base;
diff --git a/include/soc/qcom/cmd-db.h b/include/soc/qcom/cmd-db.h
index 1190f2c22ca..16609ac9d78 100644
--- a/include/soc/qcom/cmd-db.h
+++ b/include/soc/qcom/cmd-db.h
@@ -21,6 +21,8 @@ enum cmd_db_hw_type {
 
 #if IS_ENABLED(CONFIG_QCOM_COMMAND_DB)
 u32 cmd_db_read_addr(const char *resource_id);
+enum cmd_db_hw_type cmd_db_read_slave_id(const char *resource_id);
+const void *cmd_db_read_aux_data(const char *resource_id, size_t *len);
 
 #else
 static inline u32 cmd_db_read_addr(const char *resource_id)
-- 
2.34.1