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| author |   Sudeep Holla <sudeep.holla@arm.com> | 2019-07-08 09:40:52 +0100 |
|---|---|---|
| committer | Sudeep Holla <sudeep.holla@arm.com> | 2019-08-12 12:23:00 +0100 |
| commit | 22d1f76109f74b716a5f4d46bade61f544f40f81 (patch) | |
| tree | b003edfb22b92ac2db66e56c2f9163d9039c6c24 /drivers/firmware | |
| parent | firmware: arm_scmi: Separate out tx buffer handling and prepare to add rx (diff) | |
| download | linux-dev-22d1f76109f74b716a5f4d46bade61f544f40f81.tar.xz linux-dev-22d1f76109f74b716a5f4d46bade61f544f40f81.zip | |
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/firmware')
| -rw-r--r-- | drivers/firmware/arm_scmi/driver.c | 18 |
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 |