diff options
| author | Stephen Warren <swarren@nvidia.com> | 2016-08-08 09:41:33 -0600 |
|---|---|---|
| committer | Simon Glass <sjg@chromium.org> | 2016-08-12 11:01:22 -0600 |
| commit | b647f55420310beb8f576e23f3b6a69745126f71 (patch) | |
| tree | fab32f8718b719a18d6a08787101611c65bbccbe /include/misc.h | |
| parent | aa26776a2dfbf327d38a469e0d4e438f967350ab (diff) | |
| download | u-boot-imx-b647f55420310beb8f576e23f3b6a69745126f71.zip u-boot-imx-b647f55420310beb8f576e23f3b6a69745126f71.tar.gz u-boot-imx-b647f55420310beb8f576e23f3b6a69745126f71.tar.bz2 | |
misc: add "call" uclass op
The call op requests that the callee pass a message to the underlying HW
or device, wait for a response, and then pass back the response error code
and message to the callee. It is useful for drivers that represent some
kind of messaging or IPC channel to a remote device.
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'include/misc.h')
| -rw-r--r-- | include/misc.h | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/include/misc.h b/include/misc.h index 2b78814..03ef55c 100644 --- a/include/misc.h +++ b/include/misc.h @@ -38,6 +38,27 @@ int misc_write(struct udevice *dev, int offset, void *buf, int size); int misc_ioctl(struct udevice *dev, unsigned long request, void *buf); /* + * Send a message to the device and wait for a response. + * + * The caller provides the message type/ID and payload to be sent. + * The callee constructs any message header required, transmits it to the + * target, waits for a response, checks any error code in the response, + * strips any message header from the response, and returns the error code + * (or a parsed version of it) and the response message payload. + * + * @dev: the device. + * @msgid: the message ID/number to send. + * tx_msg: the request/transmit message payload. + * tx_size: the size of the buffer pointed at by tx_msg. + * rx_msg: the buffer to receive the response message payload. May be NULL if + * the caller only cares about the error code. + * rx_size: the size of the buffer pointed at by rx_msg. + * @return the response message size if OK, -ve on error + */ +int misc_call(struct udevice *dev, int msgid, void *tx_msg, int tx_size, + void *rx_msg, int rx_size); + +/* * struct misc_ops - Driver model Misc operations * * The uclass interface is implemented by all miscellaneous devices which @@ -74,6 +95,20 @@ struct misc_ops { * @return: 0 if OK, -ve on error */ int (*ioctl)(struct udevice *dev, unsigned long request, void *buf); + /* + * Send a message to the device and wait for a response. + * + * @dev: the device + * @msgid: the message ID/number to send + * tx_msg: the request/transmit message payload + * tx_size: the size of the buffer pointed at by tx_msg + * rx_msg: the buffer to receive the response message payload. May be + * NULL if the caller only cares about the error code. + * rx_size: the size of the buffer pointed at by rx_msg + * @return the response message size if OK, -ve on error + */ + int (*call)(struct udevice *dev, int msgid, void *tx_msg, int tx_size, + void *rx_msg, int rx_size); }; #endif /* _MISC_H_ */ |