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| author | Deepak Kumar Singh <quic_deesin@quicinc.com> | 2023-07-06 23:41:36 +0200 |
|---|---|---|
| committer | Bjorn Andersson <andersson@kernel.org> | 2023-07-15 20:34:49 +0200 |
| commit | 8ce49c2a2aa53afde9a20a8ce02b069d3b262af0 (patch) | |
| tree | 32b6e61ce4901d80788db1755a43bc7f63f12b56 /drivers/rpmsg | |
| parent | Linux 6.5-rc1 (diff) | |
| download | linux-8ce49c2a2aa53afde9a20a8ce02b069d3b262af0.tar.xz linux-8ce49c2a2aa53afde9a20a8ce02b069d3b262af0.zip | |
rpmsg: core: Add signal API support
Some transports like Glink support the state notifications between
clients using flow control signals similar to serial protocol signals.
Local glink client drivers can send and receive flow control status
to glink clients running on remote processors.
Add APIs to support sending and receiving of flow control status by
rpmsg clients.
Signed-off-by: Deepak Kumar Singh <quic_deesin@quicinc.com>
Signed-off-by: Sarannya S <quic_sarannya@quicinc.com>
Acked-by: Arnaud Pouliquen <arnaud.pouliquen@foss.st.com>
Link: https://lore.kernel.org/r/1688679698-31274-2-git-send-email-quic_sarannya@quicinc.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Diffstat (limited to 'drivers/rpmsg')
| -rw-r--r-- | drivers/rpmsg/rpmsg_core.c | 21 | ||||
| -rw-r--r-- | drivers/rpmsg/rpmsg_internal.h | 2 |
2 files changed, 23 insertions, 0 deletions
diff --git a/drivers/rpmsg/rpmsg_core.c b/drivers/rpmsg/rpmsg_core.c index 5039df757127..32b550c91d9f 100644 --- a/drivers/rpmsg/rpmsg_core.c +++ b/drivers/rpmsg/rpmsg_core.c @@ -331,6 +331,25 @@ int rpmsg_trysend_offchannel(struct rpmsg_endpoint *ept, u32 src, u32 dst, EXPORT_SYMBOL(rpmsg_trysend_offchannel); /** + * rpmsg_set_flow_control() - request remote to pause/resume transmission + * @ept: the rpmsg endpoint + * @pause: pause transmission + * @dst: destination address of the endpoint + * + * Return: 0 on success and an appropriate error value on failure. + */ +int rpmsg_set_flow_control(struct rpmsg_endpoint *ept, bool pause, u32 dst) +{ + if (WARN_ON(!ept)) + return -EINVAL; + if (!ept->ops->set_flow_control) + return -EOPNOTSUPP; + + return ept->ops->set_flow_control(ept, pause, dst); +} +EXPORT_SYMBOL_GPL(rpmsg_set_flow_control); + +/** * rpmsg_get_mtu() - get maximum transmission buffer size for sending message. * @ept: the rpmsg endpoint * @@ -539,6 +558,8 @@ static int rpmsg_dev_probe(struct device *dev) rpdev->ept = ept; rpdev->src = ept->addr; + + ept->flow_cb = rpdrv->flowcontrol; } err = rpdrv->probe(rpdev); diff --git a/drivers/rpmsg/rpmsg_internal.h b/drivers/rpmsg/rpmsg_internal.h index 39b646d0d40d..b950d6f790a3 100644 --- a/drivers/rpmsg/rpmsg_internal.h +++ b/drivers/rpmsg/rpmsg_internal.h @@ -55,6 +55,7 @@ struct rpmsg_device_ops { * @trysendto: see @rpmsg_trysendto(), optional * @trysend_offchannel: see @rpmsg_trysend_offchannel(), optional * @poll: see @rpmsg_poll(), optional + * @set_flow_control: see @rpmsg_set_flow_control(), optional * @get_mtu: see @rpmsg_get_mtu(), optional * * Indirection table for the operations that a rpmsg backend should implement. @@ -75,6 +76,7 @@ struct rpmsg_endpoint_ops { void *data, int len); __poll_t (*poll)(struct rpmsg_endpoint *ept, struct file *filp, poll_table *wait); + int (*set_flow_control)(struct rpmsg_endpoint *ept, bool pause, u32 dst); ssize_t (*get_mtu)(struct rpmsg_endpoint *ept); }; |