z8530_tx_begin – Begin packet transmission Synopsis void z8530_tx_begin(struct z8530_channel *c); Arguments c The Z8530 channel to kick Description This is the speed sensitive side of transmission. If we are called and no buffer is being transmitted we commence the next buffer. If nothing is queued we idle the sync. Note We are handling this code…
z8530_tx – Handle a PIO transmit event Synopsis void z8530_tx(struct z8530_channel *c); Arguments c Z8530 channel to process Description Z8530 transmit interrupt handler for the PIO mode. The basic idea is to attempt to keep the FIFO fed. We fill as many bytes in as possible, its quite possible that we won’t keep up with…
z8530_sync_txdma_open – Open a Z8530 for TX driven DMA Synopsis int z8530_sync_txdma_open(struct net_device *dev, struct z8530_channel *c); Arguments dev The network device to attach c The Z8530 channel to configure in sync DMA mode. Description Set up a Z85x30 device for synchronous DMA transmission. One ISA DMA channel must be available for this to work….
z8530_sync_txdma_close – Close down a TX driven DMA channel Synopsis int z8530_sync_txdma_close(struct net_device *dev, struct z8530_channel *c); Arguments dev Network device to detach c Z8530 channel to move into discard mode Description Shut down a DMA/PIO split mode synchronous interface. Halt the DMA, and free the buffers. Author Alan Cox <alan [at] lxorguk.ukuu.org.uk> Author. Copyright
z8530_sync_open – Open a Z8530 channel for PIO Synopsis int z8530_sync_open(struct net_device *dev, struct z8530_channel *c); Arguments dev The network interface we are using c The Z8530 channel to open in synchronous PIO mode Description Switch a Z8530 into synchronous mode without DMA assist. We raise the RTS/DTR and commence network operation. Author Alan Cox…
z8530_sync_dma_open – Open a Z8530 for DMA I/O Synopsis int z8530_sync_dma_open(struct net_device *dev, struct z8530_channel *c); Arguments dev The network device to attach c The Z8530 channel to configure in sync DMA mode. Description Set up a Z85x30 device for synchronous DMA in both directions. Two ISA DMA channels must be available for this to…
z8530_sync_dma_close – Close down DMA I/O Synopsis int z8530_sync_dma_close(struct net_device *dev, struct z8530_channel *c); Arguments dev Network device to detach c Z8530 channel to move into discard mode Description Shut down a DMA mode synchronous interface. Halt the DMA, and free the buffers. Author Alan Cox <alan [at] lxorguk.ukuu.org.uk> Author. Copyright
z8530_sync_close – Close a PIO Z8530 channel Synopsis int z8530_sync_close(struct net_device *dev, struct z8530_channel *c); Arguments dev Network device to close c Z8530 channel to disassociate and move to idle Description Close down a Z8530 interface and switch its interrupt handlers to discard future events. Author Alan Cox <alan [at] lxorguk.ukuu.org.uk> Author. Copyright
z8530_status_clear – Handle status events from a stopped chip Synopsis void z8530_status_clear(struct z8530_channel *chan); Arguments chan Z8530 channel to shut up Description Status interrupt vectors for a Z8530 that is in ‘parked’ mode. For machines with PCI Z85x30 cards, or level triggered interrupts (eg the MacII) we must clear the interrupt cause or die. Author…
z8530_status – Handle a PIO status exception Synopsis void z8530_status(struct z8530_channel *chan); Arguments chan Z8530 channel to process Description A status event occurred in PIO synchronous mode. There are several reasons the chip will bother us here. A transmit underrun means we failed to feed the chip fast enough and just broke a packet. A…
z8530_shutdown – Shutdown a Z8530 device Synopsis int z8530_shutdown(struct z8530_dev *dev); Arguments dev The Z8530 chip to shutdown Description We set the interrupt handlers to silence any interrupts. We then reset the chip and wait 100uS to be sure the reset completed. Just in case the caller then tries to do stuff. This is called…
z8530_rx_done – Receive completion callback Synopsis void z8530_rx_done(struct z8530_channel *c); Arguments c The channel that completed a receive Description A new packet is complete. Our goal here is to get back into receive mode as fast as possible. On the Z85230 we could change to using ESCC mode, but on the older chips we have…
z8530_rx_clear – Handle RX events from a stopped chip Synopsis void z8530_rx_clear(struct z8530_channel *c); Arguments c Z8530 channel to shut up Description Receive interrupt vectors for a Z8530 that is in ‘parked’ mode. For machines with PCI Z85x30 cards, or level triggered interrupts (eg the MacII) we must clear the interrupt cause or die. Author…
z8530_rx – Handle a PIO receive event Synopsis void z8530_rx(struct z8530_channel *c); Arguments c Z8530 channel to process Description Receive handler for receiving in PIO mode. This is much like the async one but not quite the same or as complex Note Its intended that this handler can easily be separated from the main code…
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…