From patchwork Thu Mar 14 17:45:47 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [2/2] ppc64: Add arch-specific pcie_get_speed_cap_mask From: Lucas Kannebley Tavares X-Patchwork-Id: 227762 Message-Id: <1363283147-8852-3-git-send-email-lucaskt@linux.vnet.ibm.com> To: dri-devel@lists.freedesktop.org Cc: linux-pci@vger.kernel.org, Alex Deucher , Bjorn Helgaas , brking@linux.vnet.ibm.com, cascardo@linux.vnet.ibm.com, Lucas Kannebley Tavares Date: Thu, 14 Mar 2013 14:45:47 -0300 From: Lucas Kannebley Tavares Betters support for gen2 speed detections on PCI buses on ppc64 architectures. Signed-off-by: Lucas Kannebley Tavares --- arch/powerpc/platforms/pseries/pci.c | 32 ++++++++++++++++++++++++++++++++ 1 files changed, 32 insertions(+), 0 deletions(-) diff --git a/arch/powerpc/platforms/pseries/pci.c b/arch/powerpc/platforms/pseries/pci.c index 0b580f4..58469fe 100644 --- a/arch/powerpc/platforms/pseries/pci.c +++ b/arch/powerpc/platforms/pseries/pci.c @@ -24,6 +24,7 @@ #include #include #include +#include #include #include @@ -108,3 +109,34 @@ static void fixup_winbond_82c105(struct pci_dev* dev) } DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_WINBOND, PCI_DEVICE_ID_WINBOND_82C105, fixup_winbond_82c105); + +int pcibios_get_speed_cap_mask(struct pci_dev *dev, u32 *mask) +{ + struct device_node *dn, *pdn; + const uint32_t *pcie_link_speed_stats = NULL; + + *mask = 0; + dn = pci_bus_to_OF_node(dev->bus); + + /* Find nearest ibm,pcie-link-speed-stats, walking up the device tree */ + for (pdn = dn; pdn != NULL; pdn = pdn->parent) { + pcie_link_speed_stats = (const uint32_t *) of_get_property(pdn, + "ibm,pcie-link-speed-stats", NULL); + if (pcie_link_speed_stats != NULL) + break; + } + + if (pcie_link_speed_stats == NULL) { + dev_info(&dev->dev, "no ibm,pcie-link-speed-stats property\n"); + return -EINVAL; + } + + switch (pcie_link_speed_stats[0]) { + case 0x02: + *mask |= PCIE_SPEED_50; + case 0x01: + *mask |= PCIE_SPEED_25; + } + + return 0; +}