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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>
This commit is contained in:
Sudeep Holla 2019-07-08 09:40:52 +01:00
parent 38c927fbeb
commit 22d1f76109
1 changed files with 18 additions and 0 deletions
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18
drivers/firmware/arm_scmi/driver.c
View File

@ -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)
@ -214,6 +220,18 @@ static inline u32 pack_scmi_header(struct scmi_msg_hdr *hdr)
FIELD_PREP(MSG_PROTOCOL_ID_MASK, hdr->protocol_id);
}
/**
* 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
*