z8530_rtsdtr – Control the outgoing DTS/RTS line Synopsis void z8530_rtsdtr(struct z8530_channel *c, int set); Arguments c The Z8530 channel to control; set 1 to set, 0 to clear Description Sets or clears DTR/RTS on the requested line. All locking is handled by the caller. For now we assume all boards use the actual RTS/DTR on…
z8530_read_port – Architecture specific interface function Synopsis int z8530_read_port(unsigned long p); Arguments p port to read Description Provided port access methods. The Comtrol SV11 requires no delays between accesses and uses PC I/O. Some drivers may need a 5uS delay In the longer term this should become an architecture specific section so that this can…
z8530_queue_xmit – Queue a packet Synopsis netdev_tx_t z8530_queue_xmit(struct z8530_channel * c, struct sk_buff * skb); Arguments c The channel to use skb The packet to kick down the channel Description Queue a packet for transmission. Because we have rather hard to hit interrupt latencies for the Z85230 per packet even in DMA mode we do the flip to DMA…
z8530_null_rx – Discard a packet Synopsis void z8530_null_rx(struct z8530_channel *c, struct sk_buff *skb); Arguments c The channel the packet arrived on skb The buffer Description We point the receive handler at this function when idle. Instead of processing the frames we get to throw them away. Author Alan Cox <alan [at] lxorguk.ukuu.org.uk> Author. Copyright
z8530_interrupt – Handle an interrupt from a Z8530 Synopsis irqreturn_t z8530_interrupt(int irq, void * dev_id); Arguments irq Interrupt number dev_id The Z8530 device that is interrupting. Description A Z85[2]30 device has stuck its hand in the air for attention. We scan both the channels on the chip for events and then call the channel specific call backs for…
z8530_init – Initialise a Z8530 device Synopsis int z8530_init(struct z8530_dev *dev); Arguments dev Z8530 device to initialise. Description Configure up a Z8530/Z85C30 or Z85230 chip. We check the device is present, identify the type and then program it to hopefully keep quite and behave. This matters a lot, a Z8530 in the wrong state will…
z8530_flush_fifo – Flush on chip RX FIFO Synopsis void z8530_flush_fifo(struct z8530_channel *c); Arguments c Channel to flush Description Flush the receive FIFO. There is no specific option for this, we blindly read bytes and discard them. Reading when there is no data is harmless. The 8530 has a 4 byte FIFO, the 85230 has 8…
z8530_dma_tx – Handle a DMA TX event Synopsis void z8530_dma_tx(struct z8530_channel *chan); Arguments chan The Z8530 channel to handle Description We have received an interrupt while doing DMA transmissions. It shouldn’t happen. Scream loudly if it does. Author Alan Cox <alan [at] lxorguk.ukuu.org.uk> Author. Copyright
z8530_dma_status – Handle a DMA status exception Synopsis void z8530_dma_status(struct z8530_channel *chan); Arguments chan Z8530 channel to process A status event occurred on the Z8530. We receive these for two reasons when in DMA mode. Firstly if we finished a packet transfer we get one and kick the next packet out. Secondly we may see…
z8530_dma_rx – Handle a DMA RX event Synopsis void z8530_dma_rx(struct z8530_channel *chan); Arguments chan Channel to handle Description Non bus mastering DMA interfaces for the Z8x30 devices. This is really pretty PC specific. The DMA mode means that most receive events are handled by the DMA hardware. We get a kick here only if a…
z8530_describe – Uniformly describe a Z8530 port Synopsis void z8530_describe(struct z8530_dev *dev, char *mapping, unsigned long io); Arguments dev Z8530 device to describe mapping string holding mapping type (eg “I/O” or “Mem”) io the port value in question Description Describe a Z8530 in a standard format. We must pass the I/O as the port offset…
z8530_channel_load – Load channel data Synopsis int z8530_channel_load(struct z8530_channel *c, u8 *rtable); Arguments c Z8530 channel to configure rtable table of register, value pairs FIXME: ioctl to allow user uploaded tables Description Load a Z8530 channel up from the system data. We use +16 to indicate the “prime” registers. The value 255 terminates the table….
xprt_write_space – wake the task waiting for transport output buffer space Synopsis void xprt_write_space(struct rpc_xprt *xprt); Arguments xprt transport with waiting tasks Description Can be called in a soft IRQ context, so xprt_write_space never sleeps. Copyright
xprt_wake_pending_tasks – wake all tasks on a transport’s pending queue Synopsis void xprt_wake_pending_tasks(struct rpc_xprt *xprt, int status); Arguments xprt transport with waiting tasks status result code to plant in each task before waking it Copyright
xprt_wait_for_buffer_space – wait for transport output buffer to clear Synopsis void xprt_wait_for_buffer_space(struct rpc_task *task, rpc_action action); Arguments task task to be put to sleep action function pointer to be executed after wait Description Note that we only set the timer for the case of RPC_IS_SOFT, since we don’t in general want to force a socket…
xprt_unregister_transport – unregister a transport implementation Synopsis int xprt_unregister_transport(struct xprt_class *transport); Arguments transport transport to unregister Return 0: transport successfully unregistered -ENOENT: transport never registered Copyright
xprt_set_retrans_timeout_rtt – set a request’s retransmit timeout Synopsis void xprt_set_retrans_timeout_rtt(struct rpc_task *task); Arguments task task whose timeout is to be set Description Set a request’s retransmit timeout using the RTT estimator. Copyright
xprt_set_retrans_timeout_def – set a request’s retransmit timeout Synopsis void xprt_set_retrans_timeout_def(struct rpc_task *task); Arguments task task whose timeout is to be set Description Set a request’s retransmit timeout based on the transport’s default timeout parameters. Used by transports that don’t adjust the retransmit timeout based on round-trip time estimation. Copyright
xprt_reserve_xprt – serialize write access to transports Synopsis int xprt_reserve_xprt(struct rpc_xprt *xprt, struct rpc_task *task); Arguments xprt pointer to the target transport task task that is requesting access to the transport Description This prevents mixing the payload of separate requests, and prevents transport connects from colliding with writes. No congestion control is provided. Copyright
xprt_release_xprt_cong – allow other requests to use a transport Synopsis void xprt_release_xprt_cong(struct rpc_xprt *xprt, struct rpc_task *task); Arguments xprt transport with other tasks potentially waiting task task that is releasing access to the transport Description Note that “task” can be NULL. Another task is awoken to use the transport if the transport’s congestion window allows…