[PATCH] Introduce rproc serial device specification.

[Sjur BrÃndeland]

Signed-off-by: Sjur BrÃndeland <sjur.brandeland@xxxxxxxxxxxxxx>
---

>> Please pick the virtio spec from
>> 
>> https://github.com/rustyrussell/virtio-spec
>> 
>> and update the spec with info for remote-proc.
>
>Hi Sjur,
>
>I didn't hear back from you on this..
>

Hi Amit
Sorry for the delay. I've had this ready for a while waiting for
go-ahead from our legal dept, and then it got stuck in my backlog.

Anyway, here is a stab at describing the rproc serial device.
Feedback is welcomed.

Thanks,
Sjur


 virtio-spec.lyx |   58 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 58 insertions(+)

diff --git a/virtio-spec.lyx b/virtio-spec.lyx
index 83f2771..bbb5c75 100644
--- a/virtio-spec.lyx
+++ b/virtio-spec.lyx
@@ -9079,6 +9079,64 @@ For MMC devices (inquiry type 5) there would be some overlap between this
 
 \end_deeper
 \begin_layout Chapter*
+Appendix J: Rproc Serial Device
+\end_layout
+
+\begin_layout Standard
+The Remoteproc Serial Device device is used when communicating with a remote
+ processor.
+ The remote processor may be a modem communicating over a shared memory
+ interface, or a CPU in an asymmetric multi-processing (AMP) configuration.
+ The Remoteproc Serial Device provides a simple device for data IO.
+ A device has one port and a single pair of virtqueues for input and output.
+ Empty buffers are placed in one virtqueue for receiving packets, and outgoing
+ packets are enqueued into another for transmission.
+\end_layout
+
+\begin_layout Section*
+Configuration
+\end_layout
+
+\begin_layout Description
+Subsystem
+\begin_inset space ~
+\end_inset
+
+Device
+\begin_inset space ~
+\end_inset
+
+ID 11
+\end_layout
+
+\begin_deeper
+\begin_layout Description
+Virtqueues 0:receiveq(port0).
+ 1:transmitq(port0),
+\end_layout
+
+\begin_layout Section*
+Device Initialization
+\end_layout
+
+\begin_layout Enumerate
+The receiveq for each port is populated with one or more receive buffers.
+\end_layout
+
+\begin_layout Section*
+Device Operation
+\end_layout
+
+\begin_layout Enumerate
+For output, a buffer containing the characters is placed in the port's transmitq.
+\end_layout
+
+\begin_layout Enumerate
+Inbound messages are placed in the receiveq and signalled by an interrupt.
+\end_layout
+
+\end_deeper
+\begin_layout Chapter*
 Appendix X: virtio-mmio
 \end_layout
 
-- 
1.7.9.5

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