diff options
Diffstat (limited to 'Documentation/staging/rpmsg.rst')
| -rw-r--r-- | Documentation/staging/rpmsg.rst | 84 |
1 files changed, 21 insertions, 63 deletions
diff --git a/Documentation/staging/rpmsg.rst b/Documentation/staging/rpmsg.rst index 1ce353cb232a..40282cca86ca 100644 --- a/Documentation/staging/rpmsg.rst +++ b/Documentation/staging/rpmsg.rst @@ -68,13 +68,14 @@ User API :: - int rpmsg_send(struct rpmsg_channel *rpdev, void *data, int len); + int rpmsg_send(struct rpmsg_endpoint *ept, void *data, int len); -sends a message across to the remote processor on a given channel. -The caller should specify the channel, the data it wants to send, +sends a message across to the remote processor from the given endpoint. +The caller should specify the endpoint, the data it wants to send, and its length (in bytes). The message will be sent on the specified -channel, i.e. its source and destination address fields will be -set to the channel's src and dst addresses. +endpoint's channel, i.e. its source and destination address fields will be +respectively set to the endpoint's src address and its parent channel +dst addresses. In case there are no TX buffers available, the function will block until one becomes available (i.e. until the remote processor consumes @@ -87,41 +88,18 @@ Returns 0 on success and an appropriate error value on failure. :: - int rpmsg_sendto(struct rpmsg_channel *rpdev, void *data, int len, u32 dst); + int rpmsg_sendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst); -sends a message across to the remote processor on a given channel, +sends a message across to the remote processor from a given endpoint, to a destination address provided by the caller. -The caller should specify the channel, the data it wants to send, +The caller should specify the endpoint, the data it wants to send, its length (in bytes), and an explicit destination address. The message will then be sent to the remote processor to which the -channel belongs, using the channel's src address, and the user-provided -dst address (thus the channel's dst address will be ignored). - -In case there are no TX buffers available, the function will block until -one becomes available (i.e. until the remote processor consumes -a tx buffer and puts it back on virtio's used descriptor ring), -or a timeout of 15 seconds elapses. When the latter happens, --ERESTARTSYS is returned. - -The function can only be called from a process context (for now). -Returns 0 on success and an appropriate error value on failure. - -:: - - int rpmsg_send_offchannel(struct rpmsg_channel *rpdev, u32 src, u32 dst, - void *data, int len); - - -sends a message across to the remote processor, using the src and dst -addresses provided by the user. - -The caller should specify the channel, the data it wants to send, -its length (in bytes), and explicit source and destination addresses. -The message will then be sent to the remote processor to which the -channel belongs, but the channel's src and dst addresses will be -ignored (and the user-provided addresses will be used instead). +endpoints's channel belongs, using the endpoints's src address, +and the user-provided dst address (thus the channel's dst address +will be ignored). In case there are no TX buffers available, the function will block until one becomes available (i.e. until the remote processor consumes @@ -134,13 +112,14 @@ Returns 0 on success and an appropriate error value on failure. :: - int rpmsg_trysend(struct rpmsg_channel *rpdev, void *data, int len); + int rpmsg_trysend(struct rpmsg_endpoint *ept, void *data, int len); -sends a message across to the remote processor on a given channel. -The caller should specify the channel, the data it wants to send, +sends a message across to the remote processor from a given endpoint. +The caller should specify the endpoint, the data it wants to send, and its length (in bytes). The message will be sent on the specified -channel, i.e. its source and destination address fields will be -set to the channel's src and dst addresses. +endpoint's channel, i.e. its source and destination address fields will be +respectively set to the endpoint's src address and its parent channel +dst addresses. In case there are no TX buffers available, the function will immediately return -ENOMEM without waiting until one becomes available. @@ -150,10 +129,10 @@ Returns 0 on success and an appropriate error value on failure. :: - int rpmsg_trysendto(struct rpmsg_channel *rpdev, void *data, int len, u32 dst) + int rpmsg_trysendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst) -sends a message across to the remote processor on a given channel, +sends a message across to the remote processor from a given endpoint, to a destination address provided by the user. The user should specify the channel, the data it wants to send, @@ -171,27 +150,6 @@ Returns 0 on success and an appropriate error value on failure. :: - int rpmsg_trysend_offchannel(struct rpmsg_channel *rpdev, u32 src, u32 dst, - void *data, int len); - - -sends a message across to the remote processor, using source and -destination addresses provided by the user. - -The user should specify the channel, the data it wants to send, -its length (in bytes), and explicit source and destination addresses. -The message will then be sent to the remote processor to which the -channel belongs, but the channel's src and dst addresses will be -ignored (and the user-provided addresses will be used instead). - -In case there are no TX buffers available, the function will immediately -return -ENOMEM without waiting until one becomes available. - -The function can only be called from a process context (for now). -Returns 0 on success and an appropriate error value on failure. - -:: - struct rpmsg_endpoint *rpmsg_create_ept(struct rpmsg_device *rpdev, rpmsg_rx_cb_t cb, void *priv, struct rpmsg_channel_info chinfo); @@ -284,7 +242,7 @@ content to the console. dev_info(&rpdev->dev, "chnl: 0x%x -> 0x%x\n", rpdev->src, rpdev->dst); /* send a message on our channel */ - err = rpmsg_send(rpdev, "hello!", 6); + err = rpmsg_send(rpdev->ept, "hello!", 6); if (err) { pr_err("rpmsg_send failed: %d\n", err); return err; |