[POWERPC] EEH: enable MMIO/DMA on frozen slot

Add wrapper around the rtas call to enable MMIO or DMA on a frozen pci
slot.

Signed-off-by: Linas Vepstas <linas@austin.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 29 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/pseries/eeh.c b/arch/powerpc/platforms/pseries/eeh.c
index fb91842fc81..4534886e3b4 100644
--- a/arch/powerpc/platforms/pseries/eeh.c
+++ b/arch/powerpc/platforms/pseries/eeh.c
@@ -482,6 +482,35 @@ eeh_slot_availability(struct pci_dn *pdn)
 }
 
 /**
+ * rtas_pci_enable - enable MMIO or DMA transfers for this slot
+ * @pdn pci device node
+ */
+
+int
+rtas_pci_enable(struct pci_dn *pdn, int function)
+{
+        int config_addr;
+        int rc;
+
+        /* Use PE configuration address, if present */
+        config_addr = pdn->eeh_config_addr;
+        if (pdn->eeh_pe_config_addr)
+                config_addr = pdn->eeh_pe_config_addr;
+
+        rc = rtas_call(ibm_set_eeh_option, 4, 1, NULL,
+                       config_addr,
+                       BUID_HI(pdn->phb->buid),
+                       BUID_LO(pdn->phb->buid),
+                            function);
+
+        if (rc)
+                printk(KERN_WARNING "EEH: Cannot enable function %d, err=%d dn=%s\n",
+                        function, rc, pdn->node->full_name);
+
+        return rc;
+}
+
+/**
  * rtas_pci_slot_reset - raises/lowers the pci #RST line
  * @pdn pci device node
  * @state: 1/0 to raise/lower the #RST