diff options
author | Dongdong Liu <liudongdong3@huawei.com> | 2016-12-01 07:33:42 +0100 |
---|---|---|
committer | Bjorn Helgaas <helgaas@kernel.org> | 2016-12-06 20:45:49 +0100 |
commit | 169de969c0188be69bd5ff1e148d42a49bf47738 (patch) | |
tree | 431b32c16b0fd30d5ed0cc8dd64eb6de5d39cea2 /drivers/pci/pci-acpi.c | |
parent | PCI/ACPI: Check for platform-specific MCFG quirks (diff) | |
download | linux-169de969c0188be69bd5ff1e148d42a49bf47738.tar.xz linux-169de969c0188be69bd5ff1e148d42a49bf47738.zip |
PCI/ACPI: Provide acpi_get_rc_resources() for ARM64 platform
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: add dev argument, wrap in #ifdef CONFIG_PCI_QUIRKS]
Signed-off-by: Dongdong Liu <liudongdong3@huawei.com>
Signed-off-by: Tomasz Nowicki <tn@semihalf.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'drivers/pci/pci-acpi.c')
-rw-r--r-- | drivers/pci/pci-acpi.c | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c index d966d47c9e80..92384dece4b4 100644 --- a/drivers/pci/pci-acpi.c +++ b/drivers/pci/pci-acpi.c @@ -29,6 +29,82 @@ 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 device *dev = &adev->dev; + 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(dev, "failed to parse _CRS method, error code %d\n", + ret); + return ret; + } + + if (ret == 0) { + dev_err(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(struct device *dev, 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)) { + dev_err(dev, "can't find _HID %s device to locate resources\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(dev, "can't get resource from %s\n", + dev_name(&adev->dev)); + return ret; + } + + return 0; +} +#endif + phys_addr_t acpi_pci_root_get_mcfg_addr(acpi_handle handle) { acpi_status status = AE_NOT_EXIST; |