| Commit message (Collapse) | Author | Age | Files | Lines |
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- Fixed grspw_dma_tx_send() so that it does not fail when an empty user packet
is provided.
- Added empty checks on some of the list handling inline functions for
GRSPW_PKT. Their use by the driver may be correct already, but the user might
not have been aware of the assumptions that certain lists had to be non-empty.
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Without this patch time code interrupts was never cleared
in the STATUS register.
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By introducing a spearate RX and TX DMA channel semaphore RX
operations and TX operations does not block each other. Stopping
a DMA channel needs now to take both RX and TX semaphores to
block out both RX and TX tasks.
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The user has already the power to control which DMA buffer
will generate interrupt, but no clean way to enable RX/TX
interrupts on DMA channel. Without this patch the user had
to init DMA config rx/tx_irq_en_cnt to a very large value.
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* Add support for reading the GRSPW TX/RX descriptor counters
directly.
* Add semaphore lock to counters to avoid couters being out
of sync
* This makes it possible for the user in polling mode to check
the amount of work before entering RX/TX descriptor table
processing.
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The user is now responsible to stop and close the DMA channels
before closing the device. To prevent complicated situations and
blocking the caller of grspw_close and grspw_dma_close a return
code was added to indicate to the user that the DMA may not have
been stopped or that blocked tasks are still active within the
driver for the specified device.
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Added functionality for manual handling of link status events,
configurable via grspw_link_ctrl.
Added statistics counter for disconnect error.
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Improved the link error handling options. Its now possible to
disable the link on individual link errors/warnings instead of
always on all or none.
Changed name of LINKOPTS_IRQ to LINKOPTS_EIRQ to match Linux
and VxWorks SpW driver.
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The EN bit (enable separate node address for this channel) is preserved when
grspw_dma_start is called. This preserves any previous address configuration.
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Update: Daniel Hellstrom updated SpW-IRQ implementation accoring to
changes in hardware register layout and features.
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This patch adds a new driver for the GRSPW SpaceWire AMBA
interface family. The new driver does not implement a standard
RTEMS driver, instead it provides only a library interface to
the GRSPW devices. This driver can be used to implement a
RTEMS I/O driver or used directly.
New features compared with old GRSPW driver:
* zero-copy packet interface
* possibility to send/receive mulitple packets per call
* optional interrupt awaken work-task to process TX/RX queues
* DMA channels support. Before only first DMA channel supported
* Separate DMA and link control
* Packet based error flags
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