From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from top.free-electrons.com ([176.31.233.9]:45567 "EHLO mail.free-electrons.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752463AbaACTK0 (ORCPT ); Fri, 3 Jan 2014 14:10:26 -0500 Date: Fri, 3 Jan 2014 20:10:24 +0100 From: Thomas Petazzoni To: Arnd Bergmann Cc: linux-arm-kernel@lists.infradead.org, Jason Gunthorpe , Lior Amsalem , linux-pci@vger.kernel.org, Gregory Cl??ment , Ezequiel Garcia , Bjorn Helgaas Subject: Re: Issue with the emulated PCI bridge implementation Message-ID: <20140103201024.08ca11fb@skate> In-Reply-To: <3246739.aRbALcNl1Y@wuerfel> References: <20131226160534.36cc4203@skate> <201401031322.31433.arnd@arndb.de> <20140103200106.5a0999a3@skate> <3246739.aRbALcNl1Y@wuerfel> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Sender: linux-pci-owner@vger.kernel.org List-ID: Dear Arnd Bergmann, On Fri, 03 Jan 2014 20:04:57 +0100, Arnd Bergmann wrote: > > Digging in the LAKML archive, I found a lspci -v output about the > > e1000e, and it has an I/O space: > > Ok, thanks for the confirmation! > > Do you mind posting your hack here? It may be useful for others as > well, such as the xgene developers that seem to be doing funny things > with their I/O space. The current hack is the following very ugly piece of code... It runs some command and reads back some registers, and you should see some well-known values (which can be found in the e1000 datasheet, I don't remember them right now). I'm not sure why I do the pci_request_selected_regions_exclusive() call *after* the actual in/out. Probably a mistake, but as I said, this is ugly stuff :) Thomas diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c index fbf75fd..739ca10 100644 --- a/drivers/net/ethernet/intel/e1000e/netdev.c +++ b/drivers/net/ethernet/intel/e1000e/netdev.c @@ -6045,7 +6045,7 @@ static int e1000_probe(struct pci_dev *pdev, const struct pci_device_id *ent) if (aspm_disable_flag) e1000e_disable_aspm(pdev, aspm_disable_flag); - err = pci_enable_device_mem(pdev); + err = pci_enable_device(pdev); if (err) return err; @@ -6073,6 +6073,34 @@ static int e1000_probe(struct pci_dev *pdev, const struct pci_device_id *ent) if (err) goto err_pci_reg; + dev_info(&pdev->dev, "==> e1000e: I/O start 0x%x, len 0x%x\n", + pci_resource_start(pdev, 2), + pci_resource_len(pdev, 2)); + + + { + unsigned long ioport_base = pci_resource_start(pdev, 2); + dev_info(&pdev->dev, "1. 0x%x 0x%x 0x%x 0x%x\n", + inl(ioport_base), + inl(ioport_base + 4), + inl(ioport_base + 8), + inl(ioport_base + 12)); + outl(0x38, ioport_base); + dev_info(&pdev->dev, "2. 0x%x 0x%x 0x%x 0x%x\n", + inl(ioport_base), + inl(ioport_base + 4), + inl(ioport_base + 8), + inl(ioport_base + 12)); + } + + err = pci_request_selected_regions_exclusive(pdev, + pci_select_bars(pdev, IORESOURCE_IO), + e1000e_driver_name); + if (err) { + dev_err(&pdev->dev, "Cannot get I/O region\n"); + goto err_pci_reg; + } + /* AER (Advanced Error Reporting) hooks */ pci_enable_pcie_error_reporting(pdev); -- Thomas Petazzoni, CTO, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com