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PCI/ACPI: Provide acpi_get_rc_resources() for ARM64 platform

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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>
This commit is contained in:
Dongdong Liu 2016-12-01 00:33:42 -06:00 committed by Bjorn Helgaas
parent 5b69b85ba1
commit 169de969c0
2 changed files with 81 additions and 0 deletions
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76
drivers/pci/pci-acpi.c
View file

@ -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;

5
drivers/pci/pci.h
View file

@ -356,4 +356,9 @@ 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(struct device *dev, const char *hid, u16 segment,
struct resource *res);
#endif
#endif /* DRIVERS_PCI_H */