From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lucas Kannebley Tavares Subject: [PATCHv2 3/3] ppc64: implemented pcibios_get_speed_cap_mask Date: Wed, 20 Mar 2013 02:24:39 -0300 Message-ID: <1363757079-23550-4-git-send-email-lucaskt@linux.vnet.ibm.com> References: <1363757079-23550-1-git-send-email-lucaskt@linux.vnet.ibm.com> Return-path: In-Reply-To: <1363757079-23550-1-git-send-email-lucaskt@linux.vnet.ibm.com> Sender: linux-pci-owner@vger.kernel.org To: linux-pci@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, dri-devel@lists.freedesktop.org Cc: Lucas Kannebley Tavares , Bjorn Helgaas , David Airlie , Benjamin Herrenschmidt , Brian King , Thadeu Cascardo , Alex Deucher List-Id: dri-devel@lists.freedesktop.org Implementation of a architecture-specific pcibios_get_speed_cap_mask. This implementation detects bus capabilities based on OF ibm,pcie-link-speed-stats property. Signed-off-by: Lucas Kannebley Tavares --- arch/powerpc/platforms/pseries/pci.c | 35 ++++++++++++++++++++++++++++++++++ 1 files changed, 35 insertions(+), 0 deletions(-) diff --git a/arch/powerpc/platforms/pseries/pci.c b/arch/powerpc/platforms/pseries/pci.c index 0b580f4..4da8deb 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 +109,37 @@ 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; + case 0x00: + default: + return -EINVAL; + } + + return 0; +} -- 1.7.4.4