#include <linux/pci-acpi.h>
#include <linux/pm_runtime.h>
#include <linux/pm_qos.h>
+ #include <linux/rwsem.h>
#include "pci.h"
/*
static struct acpi_device *acpi_pci_find_companion(struct device *dev);
+void pci_set_acpi_fwnode(struct pci_dev *dev)
+{
+ if (!ACPI_COMPANION(&dev->dev) && !pci_dev_is_added(dev))
+ ACPI_COMPANION_SET(&dev->dev,
+ acpi_pci_find_companion(&dev->dev));
+}
+
+/**
+ * pci_dev_acpi_reset - do a function level reset using _RST method
+ * @dev: device to reset
+ * @probe: if true, return 0 if device supports _RST
+ */
+int pci_dev_acpi_reset(struct pci_dev *dev, bool probe)
+{
+ acpi_handle handle = ACPI_HANDLE(&dev->dev);
+
+ if (!handle || !acpi_has_method(handle, "_RST"))
+ return -ENOTTY;
+
+ if (probe)
+ return 0;
+
+ if (ACPI_FAILURE(acpi_evaluate_object(handle, "_RST", NULL, NULL))) {
+ pci_warn(dev, "ACPI _RST failed\n");
+ return -ENOTTY;
+ }
+
+ return 0;
+}
+
+static bool acpi_pci_power_manageable(struct pci_dev *dev)
+{
+ struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
+
+ if (!adev)
+ return false;
+ return acpi_device_power_manageable(adev);
+}
+
static bool acpi_pci_bridge_d3(struct pci_dev *dev)
{
- const struct fwnode_handle *fwnode;
+ const union acpi_object *obj;
struct acpi_device *adev;
- struct pci_dev *root;
- u8 val;
+ struct pci_dev *rpdev;
if (!dev->is_hotplug_bridge)
return false;
/* Assume D3 support if the bridge is power-manageable by ACPI. */
- adev = ACPI_COMPANION(&dev->dev);
- if (!adev && !pci_dev_is_added(dev)) {
- adev = acpi_pci_find_companion(&dev->dev);
- ACPI_COMPANION_SET(&dev->dev, adev);
- }
-
- if (adev && acpi_device_power_manageable(adev))
+ if (acpi_pci_power_manageable(dev))
return true;
/*
- * Look for a special _DSD property for the root port and if it
- * is set we know the hierarchy behind it supports D3 just fine.
+ * The ACPI firmware will provide the device-specific properties through
+ * _DSD configuration object. Look for the 'HotPlugSupportInD3' property
+ * for the root port and if it is set we know the hierarchy behind it
+ * supports D3 just fine.
*/
- root = pcie_find_root_port(dev);
- if (!root)
+ rpdev = pcie_find_root_port(dev);
+ if (!rpdev)
return false;
- adev = ACPI_COMPANION(&root->dev);
- if (root == dev) {
- /*
- * It is possible that the ACPI companion is not yet bound
- * for the root port so look it up manually here.
- */
- if (!adev && !pci_dev_is_added(root))
- adev = acpi_pci_find_companion(&root->dev);
- }
-
+ adev = ACPI_COMPANION(&rpdev->dev);
if (!adev)
return false;
- fwnode = acpi_fwnode_handle(adev);
- if (fwnode_property_read_u8(fwnode, "HotPlugSupportInD3", &val))
+ if (acpi_dev_get_property(adev, "HotPlugSupportInD3",
+ ACPI_TYPE_INTEGER, &obj) < 0)
return false;
- return val == 1;
-}
-
-static bool acpi_pci_power_manageable(struct pci_dev *dev)
-{
- struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
- return adev ? acpi_device_power_manageable(adev) : false;
+ return obj->integer.value == 1;
}
static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
}
/* ACPI bus type */
+
+
+ static DECLARE_RWSEM(pci_acpi_companion_lookup_sem);
+ static struct acpi_device *(*pci_acpi_find_companion_hook)(struct pci_dev *);
+
+ /**
+ * pci_acpi_set_companion_lookup_hook - Set ACPI companion lookup callback.
+ * @func: ACPI companion lookup callback pointer or NULL.
+ *
+ * Set a special ACPI companion lookup callback for PCI devices whose companion
+ * objects in the ACPI namespace have _ADR with non-standard bus-device-function
+ * encodings.
+ *
+ * Return 0 on success or a negative error code on failure (in which case no
+ * changes are made).
+ *
+ * The caller is responsible for the appropriate ordering of the invocations of
+ * this function with respect to the enumeration of the PCI devices needing the
+ * callback installed by it.
+ */
+ int pci_acpi_set_companion_lookup_hook(struct acpi_device *(*func)(struct pci_dev *))
+ {
+ int ret;
+
+ if (!func)
+ return -EINVAL;
+
+ down_write(&pci_acpi_companion_lookup_sem);
+
+ if (pci_acpi_find_companion_hook) {
+ ret = -EBUSY;
+ } else {
+ pci_acpi_find_companion_hook = func;
+ ret = 0;
+ }
+
+ up_write(&pci_acpi_companion_lookup_sem);
+
+ return ret;
+ }
+ EXPORT_SYMBOL_GPL(pci_acpi_set_companion_lookup_hook);
+
+ /**
+ * pci_acpi_clear_companion_lookup_hook - Clear ACPI companion lookup callback.
+ *
+ * Clear the special ACPI companion lookup callback previously set by
+ * pci_acpi_set_companion_lookup_hook(). Block until the last running instance
+ * of the callback returns before clearing it.
+ *
+ * The caller is responsible for the appropriate ordering of the invocations of
+ * this function with respect to the enumeration of the PCI devices needing the
+ * callback cleared by it.
+ */
+ void pci_acpi_clear_companion_lookup_hook(void)
+ {
+ down_write(&pci_acpi_companion_lookup_sem);
+
+ pci_acpi_find_companion_hook = NULL;
+
+ up_write(&pci_acpi_companion_lookup_sem);
+ }
+ EXPORT_SYMBOL_GPL(pci_acpi_clear_companion_lookup_hook);
+
static struct acpi_device *acpi_pci_find_companion(struct device *dev)
{
struct pci_dev *pci_dev = to_pci_dev(dev);
bool check_children;
u64 addr;
+ down_read(&pci_acpi_companion_lookup_sem);
+
+ adev = pci_acpi_find_companion_hook ?
+ pci_acpi_find_companion_hook(pci_dev) : NULL;
+
+ up_read(&pci_acpi_companion_lookup_sem);
+
+ if (adev)
+ return adev;
+
check_children = pci_is_bridge(pci_dev);
/* Please ref to ACPI spec for the syntax of _ADR */
addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn);
projects / linux-2.6-microblaze.git / commitdiff