[SPARC64]: Fix conflicts in SBUS/PCI/EBUS/ISA DMA handling.

Fully unify all of the DMA ops so that subordinate bus types to
the DMA operation providers (such as ebus, isa, of_device) can
work transparently.

Basically, we just make sure that for every system device we
create, the dev->archdata 'iommu' and 'stc' fields are filled
in.

Then we have two platform variants of the DMA ops, one for SUN4U which
actually programs the real hardware, and one for SUN4V which makes
hypervisor calls.

This also fixes the crashes in parport_pc on sparc64, reported by
Meelis Roos.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 0 deletions

diff --git a/arch/sparc64/kernel/ebus.c b/arch/sparc64/kernel/ebus.c
index 6d2956179cde..bc9ae36f7a43 100644
--- a/arch/sparc64/kernel/ebus.c
+++ b/arch/sparc64/kernel/ebus.c
@@ -391,6 +391,8 @@ static void __init fill_ebus_device(struct device_node *dp, struct linux_ebus_de
         sd = &dev->ofdev.dev.archdata;
         sd->prom_node = dp;
         sd->op = &dev->ofdev;
+        sd->iommu = dev->bus->ofdev.dev.parent->archdata.iommu;
+        sd->stc = dev->bus->ofdev.dev.parent->archdata.stc;
 
         dev->ofdev.node = dp;
         dev->ofdev.dev.parent = &dev->bus->ofdev.dev;