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Cleanup unused USB enums.

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MFC after:	1 week
Sponsored by:	NVIDIA Networking
This commit is contained in:
Hans Petter Selasky 2021-07-15 12:38:16 +02:00
parent f83f5d5839
commit 65788dae31
1 changed files with 7 additions and 110 deletions
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117
sys/dev/usb/usb_transfer.h
View file

@ -30,119 +30,16 @@
#define _USB_TRANSFER_H_
/*
* Definition of internal USB transfer states:
* ===========================================
* A few words about USB transfer states:
* ======================================
*
* The main reason there are many USB states is that we are allowed to
* cancel USB transfers, then start the USB transfer again and that
* this state transaction cannot always be done in a single atomic
* operation without blocking the calling thread. One reason for this
* is that the USB hardware sometimes needs to wait for DMA
* controllers to finish which is done asynchronously and grows the
* statemachine.
*
* When extending the following statemachine there are basically two
* things you should think about: Which states should be executed or
* modified in case of USB transfer stop and which states should be
* executed or modified in case of USB transfer start. Also respect
* the "can_cancel_immed" flag which basically tells if you can go
* directly from a wait state to the cancelling states.
* USB transfers can have multiple states, because they can be
* cancelled and started again and this cannot always be done
* atomically under a mutex. One reason for this is that the USB
* hardware sometimes needs to wait for DMA controllers to finish
* which is done asynchronously and grows the statemachine.
*/
enum {
/* XFER start execute state */
/* USB_ST_SETUP = 0 (already defined) */
/* XFER transferred execute state */
/* USB_ST_TRANSFERRED = 1 (already defined) */
/* XFER error execute state */
/* USB_ST_ERROR = 2 (already defined) */
/* XFER restart after error execute state */
USB_ST_RESTART = 8,
/* XFER transfer idle state */
USB_ST_WAIT_SETUP,
/* Other XFER execute states */
USB_ST_PIPE_OPEN = 16,
USB_ST_PIPE_OPEN_ERROR,
USB_ST_PIPE_OPEN_RESTART,
USB_ST_BDMA_LOAD,
USB_ST_BDMA_LOAD_ERROR,
USB_ST_BDMA_LOAD_RESTART,
USB_ST_IVAL_DLY,
USB_ST_IVAL_DLY_ERROR,
USB_ST_IVAL_DLY_RESTART,
USB_ST_PIPE_STALL,
USB_ST_PIPE_STALL_ERROR,
USB_ST_PIPE_STALL_RESTART,
USB_ST_ENTER,
USB_ST_ENTER_ERROR,
USB_ST_ENTER_RESTART,
USB_ST_START,
USB_ST_START_ERROR,
USB_ST_START_RESTART,
USB_ST_PIPE_CLOSE,
USB_ST_PIPE_CLOSE_ERROR,
USB_ST_PIPE_CLOSE_RESTART,
USB_ST_BDMA_DLY,
USB_ST_BDMA_DLY_ERROR,
USB_ST_BDMA_DLY_RESTART,
/* XFER transfer wait states */
USB_ST_WAIT_PIPE_OPEN = 64,
USB_ST_WAIT_PIPE_OPEN_ERROR,
USB_ST_WAIT_PIPE_OPEN_RESTART,
USB_ST_WAIT_BDMA_LOAD,
USB_ST_WAIT_BDMA_LOAD_ERROR,
USB_ST_WAIT_BDMA_LOAD_RESTART,
USB_ST_WAIT_IVAL_DLY,
USB_ST_WAIT_IVAL_DLY_ERROR,
USB_ST_WAIT_IVAL_DLY_RESTART,
USB_ST_WAIT_PIPE_STALL,
USB_ST_WAIT_PIPE_STALL_ERROR,
USB_ST_WAIT_PIPE_STALL_RESTART,
USB_ST_WAIT_ENTER,
USB_ST_WAIT_ENTER_ERROR,
USB_ST_WAIT_ENTER_RESTART,
USB_ST_WAIT_START,
USB_ST_WAIT_START_ERROR,
USB_ST_WAIT_START_RESTART,
USB_ST_WAIT_PIPE_CLOSE,
USB_ST_WAIT_PIPE_CLOSE_ERROR,
USB_ST_WAIT_PIPE_CLOSE_RESTART,
USB_ST_WAIT_BDMA_DLY,
USB_ST_WAIT_BDMA_DLY_ERROR,
USB_ST_WAIT_BDMA_DLY_RESTART,
USB_ST_WAIT_TRANSFERRED,
USB_ST_WAIT_TRANSFERRED_ERROR,
USB_ST_WAIT_TRANSFERRED_RESTART,
};
/*
* The following structure defines the messages that is used to signal
* the "done_p" USB process.