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where we have trouble. Note, in theory, ATAPI DMA is no different
than ATA DMA.
"Promise" not to tell anybody
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functions to return status flags.
Note: Changing code to have DMA interface indicate when I/O is done (a la NetBSD) was considered. It was rejected due to questionable backward compatability
with ISA DMA and MAC obio DMA
Added irqack from NetBSD (though this feature should really be in the
PCI interrupt handlers)
Use pool
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Cleanup atapiscsi driver a bit by moving fields out of xfer.
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devices. Print after attach in wdc_isa, wdc_isapnp, wdc_pcmcia.
pciide_print_modes rewritten to use wdc_print_current_modes.
Disable wdc_print_caps since it's not as useful.
Inspired by NetBSD. Thanks to Dale and Theo for pointing out this improvement.
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and testing.
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Propagate verbose flag from cf_data to channel
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(return 0x00 status persistently). Send them identify to wake them up.
Flag value 0x10000 will enable probe messages for a channel/controller.
When UKC supports setting flags, this will be useful debugging
failing IDE detects without kernel recompiles.
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SCSI/ATAPI detach is not here yet.
Minor cleanup of wdc. Downgrade to UDMA mode 1 before going further.
Want to stay in UDMA modes because they're more error-resilient due to
a CRC.
Got rid of some of the ridiculous amount of softc sharing going on.
Hopefully, this will make the life of whoever goes in and fixes the
ref-counting to be correct easier.
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Changed time->ticks
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Major restructuring of the code path that sends ATAPI packet commands.
One set of functions works in polling, process, and interrupt contexts.
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driver (pciide, wdc, etc.)
Remove #define WDCDEBUG from top of files
More fixes to ATAPISCSI logic:
Not all devices transition correctly between phases. Devices are supposed
to keep BSY high until they've set the registers to the next sensible
state. Some devices drop BSY and leave the registers in an old or
nonsense state. Our polling code is extremely sensitive to this
(though an early itnerrupt could also observe this). So, if the device is
in an unexpected state, the new polling code waits for a while in the hope
that it enters a better state.
This seems to fix many of the problems reported.
Also, there was a horrible bug which would cause sense to fail on a ATAPI
command that sent data to the drive
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Separate wdc_probe_caps into wdc_probe_caps and wdc_print_caps for more
flexibility in printing capability information.
Get rid of wdc_final_attach.
Include name of device (e.g. cd0), if possible, on errors.
atapiscsi layer work:
Put a pointer to the SCSI device into ata_drive_datas' drv_softc field
Simplify, simplify, simplify. Got rid of a bunch of fields in atapiscsi_softc
Delay printing capabilities until we know the real device name (e.g. st0)
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wdc_select_drive implements the drive selection protocol
as documented in the ATA-5 preliminary specs.
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Introduction of home-grown
To enable this stuff in your configuration, look at the NEWATA conf file
and go through
dev/isa/files.isa
dev/pci/files.pci
conf/files
arch/i386/conf/files.i386
and follow the instructions on commenting/uncommenting stuff
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