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[POWERPC] Add powerpc PCI-E reset API implementation

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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: Linas Vepstas <linas@austin.ibm.com>
Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Brian King 2007-05-08 08:04:05 +10:00 committed by Paul Mackerras
parent 02bbc0f09c
commit 00c2ae35bd
1 changed files with 30 additions and 0 deletions
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30
arch/powerpc/platforms/pseries/eeh.c
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@ -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.