From patchwork Tue Aug 12 16:25:25 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Liviu Dudau X-Patchwork-Id: 4713701 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 2087CC0338 for ; Tue, 12 Aug 2014 16:28:43 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 426A620160 for ; Tue, 12 Aug 2014 16:28:42 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 5E51920148 for ; Tue, 12 Aug 2014 16:28:41 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1XHEua-00036B-MQ; Tue, 12 Aug 2014 16:27:00 +0000 Received: from fw-tnat.cambridge.arm.com ([217.140.96.21] helo=cam-smtp0.cambridge.arm.com) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1XHEuI-0002uY-Ic for linux-arm-kernel@lists.infradead.org; Tue, 12 Aug 2014 16:26:43 +0000 Received: from e106497-lin.cambridge.arm.com (e106497-lin.cambridge.arm.com [10.1.195.53]) by cam-smtp0.cambridge.arm.com (8.13.8/8.13.8) with ESMTP id s7CGPPgg026280; Tue, 12 Aug 2014 17:25:28 +0100 From: Liviu Dudau To: Bjorn Helgaas , Catalin Marinas , Will Deacon , Benjamin Herrenschmidt , Arnd Bergmann , Russell King , Tanmay Inamdar , Grant Likely , Sinan Kaya , Jingoo Han , Kukjin Kim , Suravee Suthikulanit , linux-pci Subject: [PATCH v9 12/12] PCI: Introduce pci_remap_iospace() for remapping PCI I/O bus resources into CPU space Date: Tue, 12 Aug 2014 17:25:25 +0100 Message-Id: <1407860725-25202-13-git-send-email-Liviu.Dudau@arm.com> X-Mailer: git-send-email 2.0.4 In-Reply-To: <1407860725-25202-1-git-send-email-Liviu.Dudau@arm.com> References: <1407860725-25202-1-git-send-email-Liviu.Dudau@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20140812_092643_137819_1A865BD2 X-CRM114-Status: GOOD ( 11.96 ) X-Spam-Score: -3.0 (---) Cc: linux-arch , Device Tree ML , LKML , LAKML X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-2.6 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_NONE, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Introduce a default implementation for remapping PCI bus I/O resources onto the CPU address space. Architectures with special needs may provide their own version, but most should be able to use this one. Cc: Bjorn Helgaas Cc: Arnd Bergmann Cc: Rob Herring Signed-off-by: Liviu Dudau Reviewed-by: Rob Herring --- drivers/pci/pci.c | 33 +++++++++++++++++++++++++++++++++ include/linux/pci.h | 3 +++ 2 files changed, 36 insertions(+) diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 29d1775..76d21b6 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -2707,6 +2707,39 @@ int pci_request_regions_exclusive(struct pci_dev *pdev, const char *res_name) } EXPORT_SYMBOL(pci_request_regions_exclusive); +/** + * pci_remap_iospace - Remap the memory mapped I/O space + * @res: Resource describing the I/O space + * @phys_addr: physical address where the range will be mapped. + * + * Remap the memory mapped I/O space described by the @res + * into the CPU physical address space. Only architectures + * that have memory mapped IO defined (and hence PCI_IOBASE) + * should call this function. + */ +int __weak pci_remap_iospace(const struct resource *res, phys_addr_t phys_addr) +{ + int err = -ENODEV; + +#ifdef PCI_IOBASE + if (!(res->flags & IORESOURCE_IO)) + return -EINVAL; + + if (res->end > IO_SPACE_LIMIT) + return -EINVAL; + + err = ioremap_page_range(res->start + (unsigned long)PCI_IOBASE, + res->end + 1 + (unsigned long)PCI_IOBASE, + phys_addr, pgprot_device(PAGE_KERNEL)); +#else + /* this architecture does not have memory mapped I/O space, + so this function should never be called */ + WARN_ON(1); +#endif + + return err; +} + static void __pci_set_master(struct pci_dev *dev, bool enable) { u16 old_cmd, cmd; diff --git a/include/linux/pci.h b/include/linux/pci.h index e1e0d80..988c2f5 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -1098,6 +1098,9 @@ int __must_check pci_bus_alloc_resource(struct pci_bus *bus, resource_size_t), void *alignf_data); + +int pci_remap_iospace(const struct resource *res, phys_addr_t phys_addr); + static inline dma_addr_t pci_bus_address(struct pci_dev *pdev, int bar) { struct pci_bus_region region;