Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752753AbcKRJGE (ORCPT ); Fri, 18 Nov 2016 04:06:04 -0500 Received: from szxga03-in.huawei.com ([119.145.14.66]:29003 "EHLO szxga03-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752495AbcKRJGA (ORCPT ); Fri, 18 Nov 2016 04:06:00 -0500 From: Dongdong Liu To: , , , , , , CC: , , , , , , , , Subject: [PATCH V5 1/2] PCI/ACPI: Provide acpi_get_rc_resources() for ARM64 platform Date: Fri, 18 Nov 2016 17:22:30 +0800 Message-ID: <1479460951-49281-2-git-send-email-liudongdong3@huawei.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1479460951-49281-1-git-send-email-liudongdong3@huawei.com> References: <1479460951-49281-1-git-send-email-liudongdong3@huawei.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.71.200.31] X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2954 Lines: 110 The acpi_get_rc_resources() is used to get the RC register address that can not be described in MCFG. It takes the _HID&segment to look for and outputs the RC address resource. Use PNP0C02 devices to describe such RC address resource. Use _UID to match segment to tell which root bus the PNP0C02 resource belong to. Signed-off-by: Dongdong Liu Signed-off-by: Tomasz Nowicki --- drivers/pci/pci-acpi.c | 71 ++++++++++++++++++++++++++++++++++++++++++++++++++ drivers/pci/pci.h | 4 +++ 2 files changed, 75 insertions(+) diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c index d966d47..3557e3a 100644 --- a/drivers/pci/pci-acpi.c +++ b/drivers/pci/pci-acpi.c @@ -29,6 +29,77 @@ 0x91, 0x17, 0xea, 0x4d, 0x19, 0xc3, 0x43, 0x4d }; +#ifdef CONFIG_ARM64 +static int acpi_get_rc_addr(struct acpi_device *adev, struct resource *res) +{ + struct resource_entry *entry; + struct list_head list; + unsigned long flags; + int ret; + + INIT_LIST_HEAD(&list); + flags = IORESOURCE_MEM; + ret = acpi_dev_get_resources(adev, &list, + acpi_dev_filter_resource_type_cb, + (void *) flags); + if (ret < 0) { + dev_err(&adev->dev, + "failed to parse _CRS method, error code %d\n", ret); + return ret; + } else if (ret == 0) { + dev_err(&adev->dev, + "no IO and memory resources present in _CRS\n"); + return -EINVAL; + } + + entry = list_first_entry(&list, struct resource_entry, node); + *res = *entry->res; + acpi_dev_free_resource_list(&list); + return 0; +} + +static acpi_status acpi_match_rc(acpi_handle handle, u32 lvl, void *context, + void **retval) +{ + u16 *segment = context; + unsigned long long uid; + acpi_status status; + + status = acpi_evaluate_integer(handle, "_UID", NULL, &uid); + if (ACPI_FAILURE(status) || uid != *segment) + return AE_CTRL_DEPTH; + + *(acpi_handle *)retval = handle; + return AE_CTRL_TERMINATE; +} + +int acpi_get_rc_resources(const char *hid, u16 segment, struct resource *res) +{ + struct acpi_device *adev; + acpi_status status; + acpi_handle handle; + int ret; + + status = acpi_get_devices(hid, acpi_match_rc, &segment, &handle); + if (ACPI_FAILURE(status)) { + pr_err("Can't find _HID %s device", hid); + return -ENODEV; + } + + ret = acpi_bus_get_device(handle, &adev); + if (ret) + return ret; + + ret = acpi_get_rc_addr(adev, res); + if (ret) { + dev_err(&adev->dev, "can't get RC resource"); + return ret; + } + + return 0; +} +#endif + phys_addr_t acpi_pci_root_get_mcfg_addr(acpi_handle handle) { acpi_status status = AE_NOT_EXIST; diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h index 4518562..17ffa38 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -356,4 +356,8 @@ static inline int pci_dev_specific_reset(struct pci_dev *dev, int probe) } #endif +#ifdef CONFIG_ARM64 +int acpi_get_rc_resources(const char *hid, u16 segment, struct resource *res); +#endif + #endif /* DRIVERS_PCI_H */ -- 1.9.1