From eec097d43100a8195fd4f678671ecd5d986dd675 Mon Sep 17 00:00:00 2001 From: Bjorn Helgaas Date: Mon, 13 Jun 2016 11:01:51 -0500 Subject: PCI: Add pci_enable_ptm() for drivers to enable PTM on endpoints Add an pci_enable_ptm() interface so drivers can enable PTM. The PCI core enables PTM on PTM Roots and switches automatically, but we don't enable PTM on endpoints unless a driver requests it. Signed-off-by: Bjorn Helgaas --- drivers/pci/pcie/ptm.c | 45 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) (limited to 'drivers/pci/pcie') diff --git a/drivers/pci/pcie/ptm.c b/drivers/pci/pcie/ptm.c index 48eea4e..a14ac94 100644 --- a/drivers/pci/pcie/ptm.c +++ b/drivers/pci/pcie/ptm.c @@ -68,3 +68,48 @@ void pci_ptm_init(struct pci_dev *dev) pci_ptm_info(dev); } + +int pci_enable_ptm(struct pci_dev *dev, u8 *granularity) +{ + int pos; + u32 cap, ctrl; + struct pci_dev *ups; + + if (!pci_is_pcie(dev)) + return -EINVAL; + + pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_PTM); + if (!pos) + return -EINVAL; + + pci_read_config_dword(dev, pos + PCI_PTM_CAP, &cap); + if (!(cap & PCI_PTM_CAP_REQ)) + return -EINVAL; + + /* + * For a PCIe Endpoint, PTM is only useful if the endpoint can + * issue PTM requests to upstream devices that have PTM enabled. + * + * For Root Complex Integrated Endpoints, there is no upstream + * device, so there must be some implementation-specific way to + * associate the endpoint with a time source. + */ + if (pci_pcie_type(dev) == PCI_EXP_TYPE_ENDPOINT) { + ups = pci_upstream_bridge(dev); + if (!ups || !ups->ptm_enabled) + return -EINVAL; + } else if (pci_pcie_type(dev) == PCI_EXP_TYPE_RC_END) { + } else + return -EINVAL; + + ctrl = PCI_PTM_CTRL_ENABLE; + pci_write_config_dword(dev, pos + PCI_PTM_CTRL, ctrl); + dev->ptm_enabled = 1; + + pci_ptm_info(dev); + + if (granularity) + *granularity = 0; + return 0; +} +EXPORT_SYMBOL(pci_enable_ptm); -- cgit v1.1