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Commit 00c2ae35 authored by Brian King's avatar Brian King Committed by Paul Mackerras
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[POWERPC] Add powerpc PCI-E reset API implementation 



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).

Acked-by: default avatarLinas Vepstas <linas@austin.ibm.com>
Signed-off-by: default avatarBrian King <brking@linux.vnet.ibm.com>
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
parent 02bbc0f0

arch/powerpc/platforms/pseries/eeh.c

+30 −0
Original line number Diff line number Diff line
@@ -579,6 +579,36 @@ rtas_pci_slot_reset(struct pci_dn *pdn, int state) 
		        rc, state, pdn->node->full_name);

}



/**

 * 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.