Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 169de969 authored by Dongdong Liu's avatar Dongdong Liu Committed by Bjorn Helgaas
Browse files

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: default avatarDongdong Liu <liudongdong3@huawei.com>
Signed-off-by: default avatarTomasz Nowicki <tn@semihalf.com>
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
parent 5b69b85b

drivers/pci/pci-acpi.c

+76 −0
Original line number Diff line number Diff line
@@ -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;

drivers/pci/pci.h

+5 −0
Original line number Diff line number Diff line
@@ -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 */