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[SPARC64]: Refine Sabre wsync logic.

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It is only needed when there is a PCI-PCI bridge sitting
between the device and the PCI host controller which is
not a Simba APB bridge.

Add logic to handle two special cases:

1) device behind EBUS, which sits on PCI
2) PCI controller interrupts

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2006-07-12 21:16:07 -07:00
parent 91d1ed1a6d
commit 9bbd952e7f
1 changed files with 27 additions and 8 deletions
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35
arch/sparc64/kernel/prom.c
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@ -539,23 +539,43 @@ static unsigned long __sabre_onboard_imap_off[] = {
((ino & 0x20) ? (SABRE_ICLR_SCSI + (((ino) & 0x1f) << 3)) : \
(SABRE_ICLR_A_SLOT0 + (((ino) & 0x1f)<<3)))
static int parent_is_sabre_or_simba(struct device_node *dp)
static int sabre_device_needs_wsync(struct device_node *dp)
{
struct device_node *parent = dp->parent;
char *parent_model, *parent_compat;
parent_model = of_get_property(dp->parent, "model", NULL);
/* This traversal up towards the root is meant to
* handle two cases:
*
* 1) non-PCI bus sitting under PCI, such as 'ebus'
* 2) the PCI controller interrupts themselves, which
* will use the sabre_irq_build but do not need
* the DMA synchronization handling
*/
while (parent) {
if (!strcmp(parent->type, "pci"))
break;
parent = parent->parent;
}
if (!parent)
return 0;
parent_model = of_get_property(parent,
"model", NULL);
if (parent_model &&
(!strcmp(parent_model, "SUNW,sabre") ||
!strcmp(parent_model, "SUNW,simba")))
return 1;
return 0;
parent_compat = of_get_property(dp->parent, "compatible", NULL);
parent_compat = of_get_property(parent,
"compatible", NULL);
if (parent_compat &&
(!strcmp(parent_compat, "pci108e,a000") ||
!strcmp(parent_compat, "pci108e,a001")))
return 1;
return 0;
return 0;
return 1;
}
static unsigned int sabre_irq_build(struct device_node *dp,
@ -602,8 +622,7 @@ static unsigned int sabre_irq_build(struct device_node *dp,
* is run.
*/
regs = of_get_property(dp, "reg", NULL);
if (regs &&
!parent_is_sabre_or_simba(dp)) {
if (regs && sabre_device_needs_wsync(dp)) {
irq_install_pre_handler(virt_irq,
sabre_wsync_handler,
(void *) (long) regs->phys_hi,