[PATCH] ppc64: fix PCI IO mapping

phbs_remap_io(), which maps the PCI IO space into the kernel virtual space,
is called too early on powermac, and thus doesn't work.

This fixes it by removing the call from all platforms and putting it back
into the ppc64 common code where it belongs, after the actual probing of
the bus.

That means that before that call, only the ISA IO space (if any) is mapped,
any PIO access (from quirks for example) will fail. This happens not to be
a problem for now, but we'll have to rework that code if it becomes one in
the future.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

4 files changed, 3 insertions, 7 deletions

diff --git a/arch/powerpc/platforms/maple/pci.c b/arch/powerpc/platforms/maple/pci.c
index 340c21caeae2..895aeb3f75d0 100644
--- a/arch/powerpc/platforms/maple/pci.c
+++ b/arch/powerpc/platforms/maple/pci.c
@@ -380,9 +380,6 @@ void __init maple_pcibios_fixup(void)
         for_each_pci_dev(dev)
                 pci_read_irq_line(dev);
 
-        /* Do the mapping of the IO space */
-        phbs_remap_io();
-
         DBG(" <- maple_pcibios_fixup\n");
 }
 
diff --git a/arch/powerpc/platforms/powermac/pci.c b/arch/powerpc/platforms/powermac/pci.c
index 8f818d092e2b..dfd41b9781a9 100644
--- a/arch/powerpc/platforms/powermac/pci.c
+++ b/arch/powerpc/platforms/powermac/pci.c
@@ -918,9 +918,6 @@ void __init pmac_pci_init(void)
                         PCI_DN(np)->busno = 0xf0;
         }
 
-        /* map in PCI I/O space */
-        phbs_remap_io();
-
         /* pmac_check_ht_link(); */
 
         /* Tell pci.c to not use the common resource allocation mechanism */
diff --git a/arch/powerpc/platforms/pseries/pci.c b/arch/powerpc/platforms/pseries/pci.c
index 6b0772f35692..999a9620b5ce 100644
--- a/arch/powerpc/platforms/pseries/pci.c
+++ b/arch/powerpc/platforms/pseries/pci.c
@@ -107,7 +107,6 @@ static void __init pSeries_request_regions(void)
 
 void __init pSeries_final_fixup(void)
 {
-        phbs_remap_io();
         pSeries_request_regions();
 
         pci_addr_cache_build();
diff --git a/arch/ppc64/kernel/pci.c b/arch/ppc64/kernel/pci.c
index 66698fdf059e..46929fb24f3c 100644
--- a/arch/ppc64/kernel/pci.c
+++ b/arch/ppc64/kernel/pci.c
@@ -548,6 +548,9 @@ static int __init pcibios_init(void)
         if (ppc64_isabridge_dev != NULL)
                 printk("ISA bridge at %s\n", pci_name(ppc64_isabridge_dev));
 
+        /* map in PCI I/O space */
+        phbs_remap_io();
+
         printk("PCI: Probing PCI hardware done\n");
 
         return 0;