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38 Commits

Author SHA1 Message Date
thorpej 1b5fbe0b89 DRQ 4 is used to chain the two 8237s together. Make sure it's always 
cascaded and that it will be unmasked when DMA is thawed after being
frozen.  (This also has the effect of making sure that no device ever
erroneously gets DRQ 4.)
 1998-07-08 05:23:23 +00:00
thorpej ad3073beaf Add an additional ISA DMA mode: LOOPDEMAND. This is for devices, such 
as the Shark's CS8900 Ethernet, which want to use the DMA controller in
this mode (as opposed to single mode).

[Editor's note: committed from a Shark using a new bus_dma back-end
 and a CS8900 driver converted to use the MI code :-]
 1998-06-28 06:59:35 +00:00
thorpej ab5b45577b Don't panic if a DRQ is already allocated. Instead, just return EAGAIN 
to indicate that the resource is unavailable.
 1998-06-25 19:18:05 +00:00
thorpej 680a3d77f4 Add isa_dma{freeze,thaw}(), used to temporarily stop and then restart 
all ISA DMA.  Needed by e.g. the SmartCard reader for Sharks.
 1998-06-09 01:04:17 +00:00
thorpej ff76b8e96b Change the ISA DMA API to take an isa_chipset_tag_t rather than 
a struct device * corresponding to the ISA bus device.  The ISA DMA
controller driver functions have been renamed and now take a struct
isa_dma_state *, and are called indirectly by machine-dependent code
which provides the DMA state.

These changes allow e.g. `ofisa' (the OpenFirmware configuration
mechanism for the ISA bus, used by e.g. Sharks) to use the MI ISA
DMA controller code.
 1998-06-09 00:00:21 +00:00
thorpej 8abe76d2f0 Add offset and length parameters to bus_dmamap_sync(), used for specifiying 
partial syncs of a DMA mapping.
 1998-02-04 05:12:46 +00:00
thorpej 7e062e8a4e Enable use of bus_dmamem_mmap(). 1997-09-05 01:48:33 +00:00
augustss 420b75952f Insert a sanity check so we get a panic instead of a kernel page 
fault if the DMA map is missing.
 1997-08-30 17:33:49 +00:00
augustss 3bcc377a4c Implement a function to test if a drq is taken and use it 
in two drivers.  There are still many drivers left to fix...
 1997-08-04 22:13:32 +00:00
augustss cf8a170732 Don't panic when creating a bus dma map for a taken dma channel, 
it can happen during probing.
 1997-07-31 22:20:47 +00:00
augustss a63034762b Audio: Remove the machine dependant code I put in audio.c by mistake. 
This adds another method to audio_hw_if.  Also remove a field from
audio_hw_if that was not read-only.
 1997-07-28 20:56:05 +00:00
augustss 9745684ebe Changes to the sudio system: 
- It is now possible to handle devices that want "looping" DMA,
    e.g. the SoundBlaster correctly.  The WSS and SB drivers use this.
    To do this several new methods were introduced in audio_hw_if.
  - Different silence handling (forced by previous change).
  - The audio driver can now be mmap()-ed, but due to problems in
    the VM system only for writing for now.
  - The OSS (Linux) audio emulation takes advantage of some of the
    new features.
 1997-07-27 01:16:32 +00:00
thorpej 11e78a6b0d Pull thorpej-bus-dma branch into mainline. 1997-06-06 23:43:45 +00:00
mycroft 9a7f1bfa84 Use single mode, not demand mode, for auto-initialize transfers. 1997-05-29 21:46:07 +00:00
mycroft e9028468cd Don't use the TC bit to check for wraparound in isa_dmacount(); remember the 
transfer length and use that.
 1997-05-28 20:02:39 +00:00
mycroft 188dec4d19 Clean up a bit, and export isa_dmamask() and isa_dmaunmask() interfaces. 1997-03-21 02:17:11 +00:00
mycroft 3523bc35d5 Add an isa_dmacount() function, to get the current residual count on a channel. 1997-03-21 00:00:21 +00:00
christos 86373f8cf9 backout kprintf changes 1996-10-13 01:37:04 +00:00
christos 58953408cb printf -> kprintf, sprintf -> ksprintf 1996-10-10 22:04:48 +00:00
christos e8a8a6298c - prototype fixes 1996-04-29 20:02:32 +00:00
mycroft 004f5e8d39 Fix a slight biff with 16-bit DMA in last change. 1996-03-31 20:51:43 +00:00
mycroft d8026ad9ef Oops; switched two bits. 1996-03-01 04:35:27 +00:00
mycroft f3b29ca5d2 Remove two unneeded `if's. 1996-03-01 04:13:25 +00:00
mycroft 546ad9e88b Add support to the ISA DMA framework for auto-initialize mode. 
Add experimental SB16 code, disabled for now.
 1996-03-01 04:08:13 +00:00
mycroft 3ec5928403 Keep the terminal count information around, as it's self-clearing. 1996-02-22 06:21:48 +00:00
mycroft 4d6412e7bf Move the terminal count check into a separate function. 1996-02-20 04:17:05 +00:00
cgd 8a640328ed clean up several ISA device interfaces: autoconfiguration, header 
inclusion, and interrupt configuration.  more work still needs to be done,
but it's getting better...
 1995-04-17 12:06:30 +00:00
mycroft e25c1817cf kernel_pmap --> pmap_kernel() 1995-04-10 13:08:28 +00:00
mycroft 61800cfa25 Convert port, IRQ, and DRQ numbers to ints. 1994-11-18 22:07:32 +00:00
mycroft 854d8d96dc Rearrange slightly. 1994-11-04 19:25:34 +00:00
cgd 022ee8f7fe new RCS ID format. 1994-10-27 04:14:23 +00:00
cgd 057dc4deec quiet compiler warnings 1994-05-23 03:02:13 +00:00
mycroft 2f66816d8b Rename two files. 1994-04-24 01:34:05 +00:00
mycroft 221b25fd9d Separate DMA functions. 1994-04-22 22:58:50 +00:00
mycroft 3810963ed5 Add at_setup_dmachan(). Minor cleanup. 1993-10-22 20:24:14 +00:00
mycroft 6067dc9ea8 Minor cleanup. 1993-10-17 05:34:23 +00:00
mycroft c73d85d341 Panic if DMA with odd length attempted on a 16-bit channel. 1993-10-16 03:55:59 +00:00
mycroft 4f94812b29 New file with DMA code from isa.c, modified to check for some errors. 1993-10-14 05:22:57 +00:00