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authorSudeep Holla2019-07-08 09:40:52 +0100
committerSudeep Holla2019-08-12 12:23:00 +0100
commit22d1f76109f74b716a5f4d46bade61f544f40f81 (patch)
treeb003edfb22b92ac2db66e56c2f9163d9039c6c24 /drivers
parent38c927fbebb3d69c561ae77600f64bb1c308d0c2 (diff)
firmware: arm_scmi: Add mechanism to unpack message headers
In order to identify the message type when a response arrives, we need a mechanism to unpack the message header similar to packing. Let's add one. Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/firmware/arm_scmi/driver.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/firmware/arm_scmi/driver.c b/drivers/firmware/arm_scmi/driver.c
index 989e59f3d141..835a1d9e2b9a 100644
--- a/drivers/firmware/arm_scmi/driver.c
+++ b/drivers/firmware/arm_scmi/driver.c
@@ -30,8 +30,14 @@
#include "common.h"
#define MSG_ID_MASK GENMASK(7, 0)
+#define MSG_XTRACT_ID(hdr) FIELD_GET(MSG_ID_MASK, (hdr))
#define MSG_TYPE_MASK GENMASK(9, 8)
+#define MSG_XTRACT_TYPE(hdr) FIELD_GET(MSG_TYPE_MASK, (hdr))
+#define MSG_TYPE_COMMAND 0
+#define MSG_TYPE_DELAYED_RESP 2
+#define MSG_TYPE_NOTIFICATION 3
#define MSG_PROTOCOL_ID_MASK GENMASK(17, 10)
+#define MSG_XTRACT_PROT_ID(hdr) FIELD_GET(MSG_PROTOCOL_ID_MASK, (hdr))
#define MSG_TOKEN_ID_MASK GENMASK(27, 18)
#define MSG_XTRACT_TOKEN(hdr) FIELD_GET(MSG_TOKEN_ID_MASK, (hdr))
#define MSG_TOKEN_MAX (MSG_XTRACT_TOKEN(MSG_TOKEN_ID_MASK) + 1)
@@ -215,6 +221,18 @@ static inline u32 pack_scmi_header(struct scmi_msg_hdr *hdr)
}
/**
+ * unpack_scmi_header() - unpacks and records message and protocol id
+ *
+ * @msg_hdr: 32-bit packed message header sent from the platform
+ * @hdr: pointer to header to fetch message and protocol id.
+ */
+static inline void unpack_scmi_header(u32 msg_hdr, struct scmi_msg_hdr *hdr)
+{
+ hdr->id = MSG_XTRACT_ID(msg_hdr);
+ hdr->protocol_id = MSG_XTRACT_PROT_ID(msg_hdr);
+}
+
+/**
* scmi_tx_prepare() - mailbox client callback to prepare for the transfer
*
* @cl: client pointer