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Maciej W. Rozycki 0fabe1021f MIPS: DECstation I/O ASIC DMA interrupt classes 
This change complements commits d0da7c002f7b2a93582187a9e3f73891a01d8ee4
[MIPS: DEC: Convert to new irq_chip functions] and
5359b938c0 [MIPS: DECstation I/O ASIC DMA
interrupt handling fix] and implements automatic handling of the two
classes of DMA interrupts the I/O ASIC implements, informational and
errors.

Informational DMA interrupts do not stop the transfer and use the
`handle_edge_irq' handler that clears the request right away so that
another request may be recorded while the previous is being handled.

DMA error interrupts stop the transfer and require a corrective action
before DMA can be reenabled.  Therefore they use the `handle_fasteoi_irq'
handler that only clears the request on the way out.  Because MIPS
processor interrupt inputs, one of which the I/O ASIC's interrupt
controller is cascaded to, are level-triggered it is recommended that
error DMA interrupt action handlers are registered with the IRQF_ONESHOT
flag set so that they are run with the interrupt line masked.

This change removes the export of clear_ioasic_dma_irq that now does not
have to be called by device drivers to clear interrupts explicitly
anymore.  Originally these interrupts were cleared in the .end handler of
the `irq_chip' structure, before it was removed.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/5874/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
 		2013-10-29 21:24:42 +01:00
..
ecc.h MIPS: Move headfiles to new location below arch/mips/include 2008-10-11 16:18:52 +01:00
interrupts.h MIPS: Move headfiles to new location below arch/mips/include 2008-10-11 16:18:52 +01:00
ioasic.h MIPS: DECstation I/O ASIC DMA interrupt classes 2013-10-29 21:24:42 +01:00
ioasic_addrs.h MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00
ioasic_ints.h MIPS: Move headfiles to new location below arch/mips/include 2008-10-11 16:18:52 +01:00
kn01.h MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00
kn02.h MIPS: Move headfiles to new location below arch/mips/include 2008-10-11 16:18:52 +01:00
kn02ba.h MIPS: Move headfiles to new location below arch/mips/include 2008-10-11 16:18:52 +01:00
kn02ca.h MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00
kn02xa.h MIPS: Move headfiles to new location below arch/mips/include 2008-10-11 16:18:52 +01:00
kn03.h MIPS: Move headfiles to new location below arch/mips/include 2008-10-11 16:18:52 +01:00
kn05.h MIPS: Move headfiles to new location below arch/mips/include 2008-10-11 16:18:52 +01:00
kn230.h MIPS: Move headfiles to new location below arch/mips/include 2008-10-11 16:18:52 +01:00
machtype.h MIPS: Move headfiles to new location below arch/mips/include 2008-10-11 16:18:52 +01:00
prom.h MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00
system.h MIPS: Move headfiles to new location below arch/mips/include 2008-10-11 16:18:52 +01:00