From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.kernel.org ([198.145.29.136]:51470 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753103AbcLAIbd (ORCPT ); Thu, 1 Dec 2016 03:31:33 -0500 Subject: [PATCH v10 07/12] PCI/ACPI: Provide acpi_get_rc_resources() for ARM64 platform From: Bjorn Helgaas To: linux-pci@vger.kernel.org Cc: Lorenzo Pieralisi , Gabriele Paoloni , "Rafael J. Wysocki" , Tomasz Nowicki , Duc Dang , Sinan Kaya , Christopher Covington , Dongdong Liu Date: Thu, 01 Dec 2016 02:30:22 -0600 Message-ID: <20161201083022.12247.65297.stgit@bhelgaas-glaptop.roam.corp.google.com> In-Reply-To: <20161201075131.12247.2211.stgit@bhelgaas-glaptop.roam.corp.google.com> References: <20161201075131.12247.2211.stgit@bhelgaas-glaptop.roam.corp.google.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Sender: linux-pci-owner@vger.kernel.org List-ID: From: Dongdong Liu 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 belongs to. [bhelgaas: wrap in #ifdef CONFIG_PCI_QUIRKS] Signed-off-by: Dongdong Liu Signed-off-by: Tomasz Nowicki Signed-off-by: Bjorn Helgaas --- 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..cfab024 100644 --- a/drivers/pci/pci-acpi.c +++ b/drivers/pci/pci-acpi.c @@ -29,6 +29,77 @@ const u8 pci_acpi_dsm_uuid[] = { 0x91, 0x17, 0xea, 0x4d, 0x19, 0xc3, 0x43, 0x4d }; +#if defined(CONFIG_PCI_QUIRKS) && defined(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\n", 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\n"); + 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..c27b0fc 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 +#if defined(CONFIG_PCI_QUIRKS) && defined(CONFIG_ARM64) +int acpi_get_rc_resources(const char *hid, u16 segment, struct resource *res); +#endif + #endif /* DRIVERS_PCI_H */