Returns true if another device is found and false if not. This macro, if defined, may be used to limit which BARs are discovered and configured. The following function will do the initialization only once, so it’s safe to call from multiple drivers:. These routines allow these to be changed by application code if necessary. These functions allow a device driver to set up its own mappings if it wants. These functions read a register of the appropriate size from the PCI configuration space at an address composed from the bus , devfn and offset arguments.

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Normally these base addresses will be set to default values based on the platform. If the platform acts as a host on a single PCI bus, then devices may be configured individually from the relevant device driver.

Chapter The eCos PCI Library

Initialize the PCI hardware so that the configuration space may be accessed. This is done using the function:.

In this case the driver will need to know how to access the region in segments. This is sometimes necessary for platforms with limited PCI windows.

But if the application is looking for a device of a given device class pxi. In that case drivers will have to access PCI memory space in segments.

These functions read a register of the appropriate size from the PCI configuration space at an address composed from the busdevfn and offset arguments. Configuration means telling the device where it should map its IO and memory resources. These should not generally pcu used by any code other than the PCI library, and are present in the HAL to allow low level initialization of the PCI bus and devices to take place if necessary.


When the device has been allocated memory space it can be activated. This function allows a driver to find the actual interrupt vector for a given device:.

The PCI bus supports several address spaces: The PCI support library provides a set of routines for accessing the PCI bus configuration oci in a portable manner.

The bases are initialized with default values provided by the HAL. All PCI devices must support mandatory configuration space registers. If the device may generate interrupts, the translated vector number will be stored in vec and the result is true.

Re: PCI Address Mapping

This is because all devices on the secondary side of a bridge must be evaluated for their IO and memory space requirements before the bridge can be configured. This is provided by two APIs. Read and change device-specific PCI information. It is possible for an application to override pic using the following functions:.

Initialize the PCI library and establish contact with the hardware.

For 32 bit PCI memory regions, ecod 32 bit word will be an actual pointer that can be used immediately by the driver: Scan the PCI bus for specific devices or devices of a certain class. Scanning for devices A device can have extra config registers not specified by the PCI specification. The 2GB available on many systems should suffice though.


This is not done by the library since a driver may have to initialize more state on the device before it can be safely activated. Initializing the bus Although it should not normally be necessary, this API may also be used by device driver or application code to perform PCI bus operations not supported by the PCI library.

Doing this will be platform specific and is currently beyond the scope of the HAL.

The low level API is used by the PCI library itself to access the hardware in a platform-specific manner, and may also be used by device drivers to access the PCI configuration space directly.

Otherwise edos result is false. Otherwise, false is returned. Searches the PCI bus configuration space for a device with the given vendor and device ids. The vendordeviceand class are from the device configuration space.