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PCI: Add Precision Time Measurement (PTM) support

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Add Precision Time Measurement (PTM) support (see PCIe r3.1, sec 6.22).

Enable PTM on PTM Root devices and switch ports.  This does not enable PTM
on endpoints.

There currently are no PTM-capable devices on the market, but it is
expected to be supported by the Intel Apollo Lake platform.

[bhelgaas: complete rework]
Signed-off-by: Jonathan Yong <jonathan.yong@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Jonathan Yong
2016-06-11 14:13:38 -05:00
committed by Bjorn Helgaas
parent 29b4817d40
commit 9bb04a0c4e
7 changed files with 105 additions and 1 deletions
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6
drivers/pci/pci.h
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@@ -332,6 +332,12 @@ static inline resource_size_t pci_resource_alignment(struct pci_dev *dev,
void pci_enable_acs(struct pci_dev *dev);
#ifdef CONFIG_PCIE_PTM
void pci_ptm_init(struct pci_dev *dev);
#else
static inline void pci_ptm_init(struct pci_dev *dev) { }
#endif
struct pci_dev_reset_methods {
u16 vendor;
u16 device;