powerpc: Export PCI slot reset API

Adds two new APIs to assert/deassert PCI reset to a given device. This is needed for an ipr PCI-E adapter which does not properly implement either BIST nor PCI-E hot reset, requiring a PCI-E warm reset, which is what this implements.

Signed-off-by Brian King <[email protected]>

---

 linux-2.6-bjking1/arch/powerpc/platforms/pseries/eeh.c |   41 +++++++++++++++++
 linux-2.6-bjking1/include/asm-powerpc/ppc-pci.h        |    3 +
 2 files changed, 44 insertions(+)

diff -puN arch/powerpc/platforms/pseries/eeh.c~powerpc_slot_reset_api2 arch/powerpc/platforms/pseries/eeh.c

arch/powerpc/platforms/pseries/eeh.c renamed from arch/powerpc/platforms/pseries/eeh.c~powerpc_slot_reset_api2 +41 -0

@@ -591,6 +591,47 @@ static void __rtas_set_slot_reset(struct
 	msleep (PCI_BUS_SETTLE_TIME_MSEC);
 }
 
+/**
+ * pci_set_slot_reset - Assert PCI reset to the PCI slot
+ * @dev:	pci device struct
+ *
+ * After asserting PCI reset, the caller should wait for
+ * 100 milliseconds or longer.
+ *
+ * Return value:
+ * 	0 if success
+ **/
+int pci_set_slot_reset(struct pci_dev *dev)
+{
+	struct device_node *dn = pci_device_to_OF_node(dev);
+	struct pci_dn *pdn = PCI_DN(dn);
+
+	rtas_pci_slot_reset(pdn, 3);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(pci_set_slot_reset);
+
+/**
+ * pci_clear_slot_reset - Clear PCI reset to the PCI slot
+ * @dev:	pci device struct
+ *
+ * After clearing PCI reset, the caller should wait 1.8 seconds
+ * or longer for the bus to stabilize and the device to come
+ * ready.
+ *
+ * Return value:
+ * 	0 if success
+ **/
+int pci_clear_slot_reset(struct pci_dev *dev)
+{
+	struct device_node *dn = pci_device_to_OF_node(dev);
+	struct pci_dn *pdn = PCI_DN(dn);
+
+	rtas_pci_slot_reset (pdn, 0);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(pci_clear_slot_reset);
+
 int rtas_set_slot_reset(struct pci_dn *pdn)
 {
 	int i, rc;

diff -puN include/asm-powerpc/ppc-pci.h~powerpc_slot_reset_api2 include/asm-powerpc/ppc-pci.h

include/asm-powerpc/ppc-pci.h renamed from include/asm-powerpc/ppc-pci.h~powerpc_slot_reset_api2 +3 -0

@@ -124,6 +124,9 @@ void eeh_clear_slot (struct device_node
 /* Find the associated "Partiationable Endpoint" PE */
 struct device_node * find_device_pe(struct device_node *dn);
 
+int pci_set_slot_reset(struct pci_dev *dev);
+int pci_clear_slot_reset(struct pci_dev *dev);
+
 #endif
 
 #endif /* __KERNEL__ */

_