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c7f486567c
PCIe native PME detection mechanism is based on interrupts generated by root ports or event collectors every time a PCIe device sends a PME message upstream. Once a PME message has been sent by an endpoint device and received by its root port (or event collector in the case of root complex integrated endpoints), the Requester ID from the message header is registered in the root port's Root Status register. At the same time, the PME Status bit of the Root Status register is set to indicate that there's a PME to handle. If PCIe PME interrupt is enabled for the root port, it generates an interrupt once the PME Status has been set. After receiving the interrupt, the kernel can identify the PCIe device that generated the PME using the Requester ID from the root port's Root Status register. [For details, see PCI Express Base Specification, Rev. 2.0.] Implement a driver for the PCIe PME root port service working in accordance with the above description. Based on a patch from Shaohua Li <shaohua.li@intel.com>. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
29 lines
552 B
C
29 lines
552 B
C
/*
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* drivers/pci/pcie/pme/pcie_pme.h
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*
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* PCI Express Root Port PME signaling support
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*
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* Copyright (C) 2009 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
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*/
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#ifndef _PCIE_PME_H_
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#define _PCIE_PME_H_
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struct pcie_device;
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#ifdef CONFIG_ACPI
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extern int pcie_pme_acpi_setup(struct pcie_device *srv);
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static inline int pcie_pme_platform_notify(struct pcie_device *srv)
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{
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return pcie_pme_acpi_setup(srv);
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}
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#else /* !CONFIG_ACPI */
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static inline int pcie_pme_platform_notify(struct pcie_device *srv)
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{
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return 0;
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}
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#endif /* !CONFIG_ACPI */
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#endif
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