Commit Graph

10 Commits

Author SHA1 Message Date
Suman Anna 84369fbe62 rpmsg: glink: Switch to SPDX license identifier
Use the appropriate SPDX license identifier in various rpmsg
glink driver source files and drop the previous boilerplate
license text.

Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
2018-06-03 17:37:15 -07:00
Bjorn Andersson b88eee975a rpmsg: glink: Make RX FIFO peak accessor to take an offset
To fully read the received rx data from FIFO both the command and data
has to be read. Currently we read command, data separately and process
them. By adding an offset parameter to RX FIFO peak accessor, command
and data can be read together, simplifying things.  So introduce this.

Acked-by: Arun Kumar Neelakantam <aneela@codeaurora.org>
Signed-off-by: Sricharan R <sricharan@codeaurora.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
2017-08-29 20:34:13 -07:00
Sricharan R 933b45da5d rpmsg: glink: Add support for TX intents
Intents are nothing but pre-allocated buffers of appropriate size that
are allocated on the local side and communicated to the remote side and
the remote stores the list of intent ids that it is informed.

Later when remote side is intenting to send data, it picks up a right
intent (based on the size) and sends the data buffer and the intent id.
Local side receives the data and copies it to the local intent buffer.

The whole idea is to avoid stalls on the transport for allocating
memory, used for copy based transports.

When the remote request to allocate buffers using CMD_RX_INTENT_REQ, we
allocate buffers of requested size, store the buffer id locally and also
communicate the intent id to the remote.

Acked-by: Arun Kumar Neelakantam <aneela@codeaurora.org>
Signed-off-by: Sricharan R <sricharan@codeaurora.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
2017-08-29 20:34:13 -07:00
Sricharan R d31ad615f6 rpmsg: glink: Add support for transport version negotiation
G-link supports a version number and feature flags for each transport.
A combination of the version number and feature flags enable/disable:

 (*) G-Link software updates for each edge
 (*) Individual features for each edge

Endpoints negotiate both the version and the supported flags when
the transport is opened and they cannot be changed after negotiation has
been completed.

Each full implementation of G-Link must support a minimum of the current
version, the previous version, and the base negotiation version called v0.

Acked-by: Arun Kumar Neelakantam <aneela@codeaurora.org>
Signed-off-by: Sricharan R <sricharan@codeaurora.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
2017-08-29 20:34:12 -07:00
Bjorn Andersson 7339859da8 rpmsg: glink: Allow unaligned data access
Glink protocol requires that each message is aligned on a 8 byte offset.
This is purely a restriction from glink, so in order to support clients
which do not adher to this, allow data packets of any size, but align
the head index accordingly, effectively removing the alignment
restriction.

Acked-by: Arun Kumar Neelakantam <aneela@codeaurora.org>
Signed-off-by: Sricharan R <sricharan@codeaurora.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
2017-08-29 14:29:33 -07:00
Bjorn Andersson 835764ddd9 rpmsg: glink: Move the common glink protocol implementation to glink_native.c
Move the common part of glink core protocol implementation to
glink_native.c that can be shared with the smem based glink
transport in the later patches.

Acked-by: Arun Kumar Neelakantam <aneela@codeaurora.org>
Signed-off-by: Sricharan R <sricharan@codeaurora.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
2017-08-29 14:29:33 -07:00
Bjorn Andersson 6799c434c2 rpmsg: glink: Split rpm_probe to reuse the common code
There is quite some code common in glink_rpm_probe that can reused for
glink-smem based transport as well. So split the function and move the
code to glink_native_probe that can be used later when we add the
support for glink-smem based transport. Also reuse driver's remove as
well.

Acked-by: Arun Kumar Neelakantam <aneela@codeaurora.org>
Signed-off-by: Sricharan R <sricharan@codeaurora.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
2017-08-29 14:29:33 -07:00
Bjorn Andersson e45c5dc26d rpmsg: glink: Associate indirections for pipe fifo accessor's
With the intention of reusing the glink core protocol commands and code
across both rpm and smem based transports, the only thing different is
way of accessing the shared-memory of the transport (FIFO). So put the
fifo accessor's of the transport's pipe (rx/tx) behind indirections, so
that the rest of the code can be shared.

For this, have a qcom_glink_pipe that can be used in the common code
containing the indirections and wrap it with glink_rpm_pipe that
contains the transport specific members.

Acked-by: Arun Kumar Neelakantam <aneela@codeaurora.org>
Signed-off-by: Sricharan R <sricharan@codeaurora.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
2017-08-29 14:29:32 -07:00
Bjorn Andersson d7101feb69 rpmsg: glink: Rename glink_rpm_xx functions to qcom_glink_xx
Renaming the glink_rpm_xx functions and structs to qcom_glink_xx
equivalents helps to reuse the core glink protocol while adding
support for smem based glink transport in the later patches.

Acked-by: Arun Kumar Neelakantam <aneela@codeaurora.org>
Signed-off-by: Sricharan R <sricharan@codeaurora.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
2017-08-29 14:29:32 -07:00
Bjorn Andersson b4f8e52b89 rpmsg: Introduce Qualcomm RPM glink driver
This introduces a basic driver for communicating over "native glink"
with the RPM found in Qualcomm platforms.

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
2017-05-30 20:57:23 -07:00