[PATCH 1/1] powerpc: Add powerpc PCI-E reset API implementation

[Brian King]

Adds the pSeries platform implementation for a new PCI API
which can be used to issue various types of PCI-E reset,
including PCI-E warm reset and PCI-E hot reset. This is needed
for an ipr PCI-E adapter which does not properly implement BIST.
Running BIST on this adapter results in PCI-E errors. The only
reliable reset mechanism that exists on this hardware is PCI
Fundamental reset (warm reset). 

Signed-off-by: Brian King <brking at linux.vnet.ibm.com>
---

Paul,

This patch requires a generic PCI layer patch, which is in Greg's
queue for 2.6.22, so do NOT apply this yet. Once the PCI change goes
in, I will resend this patch.

This is an update in response to the comments Linas Vepstas had.

Thanks,

Brian
---

 linux-2.6-bjking1/arch/powerpc/platforms/pseries/eeh.c |   30 +++++++++++++++++
 1 files changed, 30 insertions(+)

diff -puN arch/powerpc/platforms/pseries/eeh.c~powerpc_slot_reset_api3 arch/powerpc/platforms/pseries/eeh.c
--- linux-2.6/arch/powerpc/platforms/pseries/eeh.c~powerpc_slot_reset_api3	2007-04-06 15:39:12.000000000 -0500
+++ linux-2.6-bjking1/arch/powerpc/platforms/pseries/eeh.c	2007-04-06 15:40:29.000000000 -0500
@@ -561,6 +561,36 @@ rtas_pci_slot_reset(struct pci_dn *pdn, 
 }
 
 /**
+ * pcibios_set_pcie_slot_reset - Set PCI-E reset state
+ * @dev:	pci device struct
+ * @state:	reset state to enter
+ *
+ * Return value:
+ * 	0 if success
+ **/
+int pcibios_set_pcie_reset_state(struct pci_dev *dev, enum pcie_reset_state state)
+{
+	struct device_node *dn = pci_device_to_OF_node(dev);
+	struct pci_dn *pdn = PCI_DN(dn);
+
+	switch (state) {
+	case pcie_deassert_reset:
+		rtas_pci_slot_reset(pdn, 0);
+		break;
+	case pcie_hot_reset:
+		rtas_pci_slot_reset(pdn, 1);
+		break;
+	case pcie_warm_reset:
+		rtas_pci_slot_reset(pdn, 3);
+		break;
+	default:
+		return -EINVAL;
+	};
+
+	return 0;
+}
+
+/**
  * rtas_set_slot_reset -- assert the pci #RST line for 1/4 second
  * @pdn: pci device node to be reset.
  *
_