From patchwork Fri Mar 14 15:34:27 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Liviu Dudau X-Patchwork-Id: 330359 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 8987C2C00C6 for ; Sat, 15 Mar 2014 02:36:16 +1100 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755536AbaCNPfR (ORCPT ); Fri, 14 Mar 2014 11:35:17 -0400 Received: from fw-tnat.cambridge.arm.com ([217.140.96.21]:50998 "EHLO cam-smtp0.cambridge.arm.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1755524AbaCNPfP (ORCPT ); Fri, 14 Mar 2014 11:35:15 -0400 Received: from e106497-lin.cambridge.arm.com (e106497-lin.cambridge.arm.com [10.1.195.170]) by cam-smtp0.cambridge.arm.com (8.13.8/8.13.8) with ESMTP id s2EFYWI9004053; Fri, 14 Mar 2014 15:34:32 GMT From: Liviu Dudau To: linux-pci , Bjorn Helgaas , Catalin Marinas , Will Deacon , Benjamin Herrenschmidt , linaro-kernel , Arnd Bergmann Cc: LKML , "devicetree@vger.kernel.org" , LAKML , Tanmay Inamdar , Grant Likely Subject: [PATCH v7 1/6] pci: Introduce pci_register_io_range() helper function. Date: Fri, 14 Mar 2014 15:34:27 +0000 Message-Id: <1394811272-1547-2-git-send-email-Liviu.Dudau@arm.com> X-Mailer: git-send-email 1.9.0 In-Reply-To: <1394811272-1547-1-git-send-email-Liviu.Dudau@arm.com> References: <1394811272-1547-1-git-send-email-Liviu.Dudau@arm.com> Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Some architectures do not share x86 simple view of the PCI I/O space and instead use a range of addresses that map to bus addresses. For some architectures these ranges will be expressed by OF bindings in a device tree file. Introduce a pci_register_io_range() helper function that can be used by the architecture code to keep track of the I/O ranges described by the PCI bindings. If the PCI_IOBASE macro is not defined that signals lack of support for PCI and we return an error. Signed-off-by: Liviu Dudau Acked-by: Grant Likely Tested-by: Tanmay Inamdar --- drivers/of/address.c | 9 +++++++++ include/linux/of_address.h | 1 + 2 files changed, 10 insertions(+) diff --git a/drivers/of/address.c b/drivers/of/address.c index 1a54f1f..be958ed 100644 --- a/drivers/of/address.c +++ b/drivers/of/address.c @@ -619,6 +619,15 @@ const __be32 *of_get_address(struct device_node *dev, int index, u64 *size, } EXPORT_SYMBOL(of_get_address); +int __weak pci_register_io_range(phys_addr_t addr, resource_size_t size) +{ +#ifndef PCI_IOBASE + return -EINVAL; +#else + return 0; +#endif +} + unsigned long __weak pci_address_to_pio(phys_addr_t address) { if (address > IO_SPACE_LIMIT) diff --git a/include/linux/of_address.h b/include/linux/of_address.h index 5f6ed6b..40c418d 100644 --- a/include/linux/of_address.h +++ b/include/linux/of_address.h @@ -56,6 +56,7 @@ extern void __iomem *of_iomap(struct device_node *device, int index); extern const __be32 *of_get_address(struct device_node *dev, int index, u64 *size, unsigned int *flags); +extern int pci_register_io_range(phys_addr_t addr, resource_size_t size); extern unsigned long pci_address_to_pio(phys_addr_t addr); extern int of_pci_range_parser_init(struct of_pci_range_parser *parser,