[PATCH] powerpc/powernv: retrieve m64_bar_idx from device node

[Wei Yang <weiyang@linux.vnet.ibm.com>]

Count of M64 BAR would differ with the evolution of hardware.

This patch retieves this count from device node instead of a hard coded
value.

Signed-off-by: Wei Yang <weiyang@linux.vnet.ibm.com>
---
 arch/powerpc/platforms/powernv/pci-ioda.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index 5c65d8f..4635d25 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -368,6 +368,7 @@ static void __init pnv_ioda_parse_m64_window(struct pnv_phb *phb)
 	struct resource *res;
 	const u32 *r;
 	u64 pci_addr;
+	const __be32 *prop32;
 
 	/* FIXME: Support M64 for P7IOC */
 	if (phb->type != PNV_PHB_IODA2) {
@@ -402,7 +403,11 @@ static void __init pnv_ioda_parse_m64_window(struct pnv_phb *phb)
 			res->start, res->end, pci_addr);
 
 	/* Use last M64 BAR to cover M64 window */
-	phb->ioda.m64_bar_idx = 15;
+	prop32 = of_get_property(dn, "ibm,opal-m64-count", NULL);
+	if (prop32)
+		phb->ioda.m64_bar_idx = be32_to_cpup(prop32) - 1;
+	else
+		phb->ioda.m64_bar_idx = 15;
 	phb->init_m64 = pnv_ioda2_init_m64;
 	phb->reserve_m64_pe = pnv_ioda2_reserve_m64_pe;
 	phb->pick_m64_pe = pnv_ioda2_pick_m64_pe;
-- 
2.5.0