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authorRafael J. Wysocki <rjw@sisk.pl>2009-01-01 19:48:55 +0100
committerJesse Barnes <jbarnes@virtuousgeek.org>2009-01-07 11:13:25 -0800
commitfacf6d1627a33badbbc154524c4a2c73c51bdc99 (patch)
treeca82decb3de7da887ee01748d9835a020c1d99cf /drivers/pci/pcie
parent16cf0ebc35dd63f72628ba1246132a6fd17bced2 (diff)
PCI: PCIe portdrv: Add kerneldoc comments to some core functions
Add kerneldoc comments to some functions in drivers/pci/pcie/portdrv_core.c, since the code in there is not easy to follow without any additional description. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'drivers/pci/pcie')
-rw-r--r--drivers/pci/pcie/portdrv_core.c77
1 files changed, 70 insertions, 7 deletions
diff --git a/drivers/pci/pcie/portdrv_core.c b/drivers/pci/pcie/portdrv_core.c
index 6a9f83ccaff..8f09b353d2a 100644
--- a/drivers/pci/pcie/portdrv_core.c
+++ b/drivers/pci/pcie/portdrv_core.c
@@ -94,12 +94,12 @@ static int pcie_port_resume_service(struct device *dev)
return 0;
}
-/*
- * release_pcie_device
- *
- * Being invoked automatically when device is being removed
- * in response to device_unregister(dev) call.
- * Release all resources being claimed.
+/**
+ * release_pcie_device - free PCI Express port service device structure
+ * @dev: Port service device to release
+ *
+ * Invoked automatically when device is being removed in response to
+ * device_unregister(dev). Release all resources being claimed.
*/
static void release_pcie_device(struct device *dev)
{
@@ -127,7 +127,16 @@ static int is_msi_quirked(struct pci_dev *dev)
}
return quirk;
}
-
+
+/**
+ * assign_interrupt_mode - choose interrupt mode for PCI Express port services
+ * (INTx, MSI-X, MSI) and set up vectors
+ * @dev: PCI Express port to handle
+ * @vectors: Array of interrupt vectors to populate
+ * @mask: Bitmask of port capabilities returned by get_port_device_capability()
+ *
+ * Return value: Interrupt mode associated with the port
+ */
static int assign_interrupt_mode(struct pci_dev *dev, int *vectors, int mask)
{
int i, pos, nvec, status = -EINVAL;
@@ -174,6 +183,16 @@ static int assign_interrupt_mode(struct pci_dev *dev, int *vectors, int mask)
return interrupt_mode;
}
+/**
+ * get_port_device_capability - discover capabilities of a PCI Express port
+ * @dev: PCI Express port to examine
+ *
+ * The capabilities are read from the port's PCI Express configuration registers
+ * as described in PCI Express Base Specification 1.0a sections 7.8.2, 7.8.9 and
+ * 7.9 - 7.11.
+ *
+ * Return value: Bitmask of discovered port capabilities
+ */
static int get_port_device_capability(struct pci_dev *dev)
{
int services = 0, pos;
@@ -201,6 +220,15 @@ static int get_port_device_capability(struct pci_dev *dev)
return services;
}
+/**
+ * pcie_device_init - initialize PCI Express port service device
+ * @dev: Port service device to initialize
+ * @parent: PCI Express port to associate the service device with
+ * @port_type: Type of the port
+ * @service_type: Type of service to associate with the service device
+ * @irq: Interrupt vector to associate with the service device
+ * @irq_mode: Interrupt mode of the service (INTx, MSI-X, MSI)
+ */
static void pcie_device_init(struct pci_dev *parent, struct pcie_device *dev,
int port_type, int service_type, int irq, int irq_mode)
{
@@ -226,6 +254,14 @@ static void pcie_device_init(struct pci_dev *parent, struct pcie_device *dev,
device->parent = &parent->dev;
}
+/**
+ * alloc_pcie_device - allocate PCI Express port service device structure
+ * @parent: PCI Express port to associate the service device with
+ * @port_type: Type of the port
+ * @service_type: Type of service to associate with the service device
+ * @irq: Interrupt vector to associate with the service device
+ * @irq_mode: Interrupt mode of the service (INTx, MSI-X, MSI)
+ */
static struct pcie_device* alloc_pcie_device(struct pci_dev *parent,
int port_type, int service_type, int irq, int irq_mode)
{
@@ -239,6 +275,10 @@ static struct pcie_device* alloc_pcie_device(struct pci_dev *parent,
return device;
}
+/**
+ * pcie_port_device_probe - check if device is a PCI Express port
+ * @dev: Device to check
+ */
int pcie_port_device_probe(struct pci_dev *dev)
{
int pos, type;
@@ -256,6 +296,13 @@ int pcie_port_device_probe(struct pci_dev *dev)
return -ENODEV;
}
+/**
+ * pcie_port_device_register - register PCI Express port
+ * @dev: PCI Express port to register
+ *
+ * Allocate the port extension structure and register services associated with
+ * the port.
+ */
int pcie_port_device_register(struct pci_dev *dev)
{
struct pcie_port_device_ext *p_ext;
@@ -319,6 +366,11 @@ static int suspend_iter(struct device *dev, void *data)
return 0;
}
+/**
+ * pcie_port_device_suspend - suspend port services associated with a PCIe port
+ * @dev: PCI Express port to handle
+ * @state: Representation of system power management transition in progress
+ */
int pcie_port_device_suspend(struct pci_dev *dev, pm_message_t state)
{
return device_for_each_child(&dev->dev, &state, suspend_iter);
@@ -337,6 +389,10 @@ static int resume_iter(struct device *dev, void *data)
return 0;
}
+/**
+ * pcie_port_device_suspend - resume port services associated with a PCIe port
+ * @dev: PCI Express port to handle
+ */
int pcie_port_device_resume(struct pci_dev *dev)
{
return device_for_each_child(&dev->dev, NULL, resume_iter);
@@ -359,6 +415,13 @@ static int remove_iter(struct device *dev, void *data)
return 0;
}
+/**
+ * pcie_port_device_remove - unregister PCI Express port service devices
+ * @dev: PCI Express port the service devices to unregister are associated with
+ *
+ * Remove PCI Express port service devices associated with given port and
+ * disable MSI-X or MSI for the port.
+ */
void pcie_port_device_remove(struct pci_dev *dev)
{
struct device *device;