From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from va3outboundpool.messaging.microsoft.com (va3ehsobe003.messaging.microsoft.com [216.32.180.13]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (Client CN "mail.global.frontbridge.com", Issuer "Microsoft Secure Server Authority" (not verified)) by ozlabs.org (Postfix) with ESMTPS id 86F832C007F for ; Wed, 19 Sep 2012 17:23:40 +1000 (EST) From: Minghuan Lian To: Subject: [PATCH] powerpc/fsl-pci: use 'Header Type' to identify PCIE mode Date: Wed, 19 Sep 2012 15:23:38 +0800 Message-ID: <1348039419-17798-1-git-send-email-Minghuan.Lian@freescale.com> MIME-Version: 1.0 Content-Type: text/plain Cc: Minghuan Lian List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , The original code uses 'Programming Interface' field to judge if PCIE is EP or RC mode, however, some latest silicons do not support this functionality. According to PCIE specification, 'Header Type' offset 0x0e is used to indicate header type, so change code to use 'Header Type' field to judge PCIE mode. Because FSL PCI controller does not support 'Header Type', patch still uses 'Programming Interface' to identify PCI mode. Signed-off-by: Minghuan Lian Signed-off-by: Roy Zang --- arch/powerpc/sysdev/fsl_pci.c | 38 +++++++++++++++++++++++--------------- 1 file changed, 23 insertions(+), 15 deletions(-) diff --git a/arch/powerpc/sysdev/fsl_pci.c b/arch/powerpc/sysdev/fsl_pci.c index c37f461..43d30df 100644 --- a/arch/powerpc/sysdev/fsl_pci.c +++ b/arch/powerpc/sysdev/fsl_pci.c @@ -38,15 +38,15 @@ static int fsl_pcie_bus_fixup, is_mpc83xx_pci; static void __devinit quirk_fsl_pcie_header(struct pci_dev *dev) { - u8 progif; + u8 hdr_type; /* if we aren't a PCIe don't bother */ if (!pci_find_capability(dev, PCI_CAP_ID_EXP)) return; /* if we aren't in host mode don't bother */ - pci_read_config_byte(dev, PCI_CLASS_PROG, &progif); - if (progif & 0x1) + pci_read_config_byte(dev, PCI_HEADER_TYPE, &hdr_type); + if ((hdr_type & 0x7f) != PCI_HEADER_TYPE_BRIDGE) return; dev->class = PCI_CLASS_BRIDGE_PCI << 8; @@ -425,7 +425,7 @@ int __init fsl_add_bridge(struct device_node *dev, int is_primary) struct pci_controller *hose; struct resource rsrc; const int *bus_range; - u8 progif; + u8 hdr_type, progif; if (!of_device_is_available(dev)) { pr_warning("%s: disabled\n", dev->full_name); @@ -457,25 +457,24 @@ int __init fsl_add_bridge(struct device_node *dev, int is_primary) setup_indirect_pci(hose, rsrc.start, rsrc.start + 0x4, PPC_INDIRECT_TYPE_BIG_ENDIAN); - early_read_config_byte(hose, 0, 0, PCI_CLASS_PROG, &progif); - if ((progif & 1) == 1) { - /* unmap cfg_data & cfg_addr separately if not on same page */ - if (((unsigned long)hose->cfg_data & PAGE_MASK) != - ((unsigned long)hose->cfg_addr & PAGE_MASK)) - iounmap(hose->cfg_data); - iounmap(hose->cfg_addr); - pcibios_free_controller(hose); - return -ENODEV; - } - setup_pci_cmd(hose); /* check PCI express link status */ if (early_find_capability(hose, 0, 0, PCI_CAP_ID_EXP)) { + /* For PCIE read HEADER_TYPE to identify controler mode */ + early_read_config_byte(hose, 0, 0, PCI_HEADER_TYPE, &hdr_type); + if ((hdr_type & 0x7f) != PCI_HEADER_TYPE_BRIDGE) + goto no_bridge; + hose->indirect_type |= PPC_INDIRECT_TYPE_EXT_REG | PPC_INDIRECT_TYPE_SURPRESS_PRIMARY_BUS; if (fsl_pcie_check_link(hose)) hose->indirect_type |= PPC_INDIRECT_TYPE_NO_PCIE_LINK; + } else { + /* For PCI read PROG to identify controller mode */ + early_read_config_byte(hose, 0, 0, PCI_CLASS_PROG, &progif); + if ((progif & 1) == 1) + goto no_bridge; } printk(KERN_INFO "Found FSL PCI host bridge at 0x%016llx. " @@ -494,6 +493,15 @@ int __init fsl_add_bridge(struct device_node *dev, int is_primary) setup_pci_atmu(hose, &rsrc); return 0; + +no_bridge: + /* unmap cfg_data & cfg_addr separately if not on same page */ + if (((unsigned long)hose->cfg_data & PAGE_MASK) != + ((unsigned long)hose->cfg_addr & PAGE_MASK)) + iounmap(hose->cfg_data); + iounmap(hose->cfg_addr); + pcibios_free_controller(hose); + return -ENODEV; } #endif /* CONFIG_FSL_SOC_BOOKE || CONFIG_PPC_86xx */ -- 1.7.9.5