(currently only CD-ROM drives on i386). The sys/dev/scsipi system provides 2
busses to which devices can attach (scsibus and atapibus). This needed to
change some include files and structure names in the low level scsi drivers.
when running at high speeds. This works by using hardware RTS again and
using the receive fifo threshold as well as the transmit fifo provided
by the sc26c92.
lpt{open,close,write,ioctl} prototypes.
* Remove the cdev_decl(lpt). We get it from machine/conf.h.
* Add and use LPTSOFTC.
* Use level triggered interrupts (seems to work with less spurious interrupts).
* Do not use NLPT. Use lpt_cd.cd_ndevs to get the number of lpt devices.
* ether_ifattach now needs the ethernet address of the device. Supply a
dummy address.
* Use machine/conf.h not sys/conf.h to get the prototypes for the
scn cdev functions.
* Include <sys/kgdb.h> to get prototypes for kgdb_connect and kgdb_attach.
* Add missing prototypes for some functions.
* Make ddb work before the console was opend. Thank's to Ian Dall
for this change. His comment:
Also, ddb doesn't work if a break is set before the console
is opened. That is because DTR and RTS are not asserted. It
would probably work if the console is wired to ingnore DTR
or RTS. The change below is probably not very correct.
Proabably the state of DTR and RTS should be saved and DTR
and RTS asserted on the start of a polled serial input and
the saved values restored on exiting polled input
* Remove unused function scn_ei.
* Add prototype for ncr_ready.
* Add ncr_wait_not_req function from Ian Dall:
The ncr_wait_not_req business is to avoid a potential race.
When the pseudo DMA finishes, the target may not have
lowered REQ yet. If we just charge ahead, we eventually test
for phase when REQ is high. However, if REQ has not yet gone
low for the last byte transferred, this will be the wrong
phase. This is taken from the dp8490 application notes. The
last ACK is not deasserted until the dma is completed.
Deasserting the last ACK should be delayed until the last
REQ is deasserted. I am not sure if there are ever devices
this slow, but I believe the code is "more correct".
Some of the stuff (e.g., rarpd, bootpd, dhcpd etc., libsa) still will
only support Ethernet. Tcpdump itself should be ok, but libpcap needs
lot of work.
For the detailed change history, look at the commit log entries for
the is-newarp branch.
* Uses Counter/Timer dynamicly for rate generation; You can
have both 19200 and 38400 on one duart, and 57600 on another!
* Improved scninfo program to dump driver internal information.
implemented counters for parity err, framing err, break
* Delays changes until transmitter idle to avoid "glitches"
* Cleaned up scn_softc member names
* Untested support for sc26c92 (I don't yet have any to test with);
+ Will use alternate rate tables (include 115.2kbps and 230.4kbps)
+ Will raise FIFO rx interrupt threshold and watchdog timer
at higher rates.
+ Unknown (to me) how fast pc532 MC145406 driver chips can go
NOTE: It seems like it may be a BAD idea to use a sc26c92 as
a console port for now; the PROM doesn't know to reset the
chip back to scn2692 mode!!
* Define RECOVER to something faster.
* Check for a valid softc in scnsoft. When there is
a "hole" (e.g. you have scn0,scn1, scn4, scn5) the
old code would panic. Thank's to Phil Budne for
finding and fixing this bug.
* Define SCN_RING_HIWAT and add sc_rbhiwat to scn_softc. When the
ringbuffer gets full up to this mark, rts gets asserted (Ian Dall).
* Add sc_rx_blocked to scn_softc. This is used to tell scnsoft that
rxinterrupts are blocked (Ian Dall).
* intr_establish now takes *two* ipls. One at which the handler should run,
and one in which the interrupt should get blocked.
All the following changes were provided by Ian Dall:
* Remove SCN_HSOFT. Now that the pc532's software interrupt system is running
from int14, this won't work anymore.
* Add code to detect uart type (SCN2681, SCC2692 or SCC26C92).
* Cleanup my RECOVER mess. Thank's to Ian Dall for reading the datasheet
and removing all the unnecessary RECOVERs.
* Cleanup scnrxintr.
* Implement scnhiwflow.
* Do not use automatic RTS. This and scnhiflow and some changes to the
interrupt system suggested by Ian fix the scn overrun problem at 57600
baud.
* intr_establish now takes *two* ipls. One at which the handler should run,
and one in which the interrupt should get blocked.
* Make transfersize configurable for input and output. Default the input
transfersize to 128 bytes. That way interrupts won't be disabled for more
then about 128us-256us for slow targets. This is necessary to prevent scn
fifo overruns. Cleanup the pdma code. Thank's to Ian Dall for these
changes.
* Real probe code added.
* Duart info is now allocated only for devices that are present.
* Added IO-Recovery delays for 30mhz systems.
* Removed a few potential NULL-pointer references.
* Support for bpf added.
* Don't duplicate code, use ether_ifattach instead.
* Recode plipreceive and pliptransmit in assembler.
This improves performance from 40 kbyte/s to 50 kbyte/s
between a 30mhz pc532 and a 25mhz i386.
matthias