[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: NLinas Vepstas <linas@austin.ibm.com>
Signed-off-by: NPaul Mackerras <paulus@samba.org>

arch/powerpc/platforms/pseries/eeh.c

@@ -481,6 +481,35 @@ eeh_slot_availability(struct pci_dn *pdn)
 	return -1;
 }
 
+/**
+ * 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

include/asm-powerpc/ppc-pci.h

@@ -68,6 +68,17 @@ struct pci_dev *pci_get_device_by_addr(unsigned long addr);
  */
 void eeh_slot_error_detail (struct pci_dn *pdn, int severity);
 
+/**
+ * rtas_pci_enableo - enable IO transfers for this slot
+ * @pdn:       pci device node
+ * @function:  either EEH_THAW_MMIO or EEH_THAW_DMA 
+ *
+ * Enable I/O transfers to this slot 
+ */
+#define EEH_THAW_MMIO 2
+#define EEH_THAW_DMA  3
+int rtas_pci_enable(struct pci_dn *pdn, int function);
+
 /**
  * rtas_set_slot_reset -- unfreeze a frozen slot
  *