The above functions only allow access to generic PCI config registers. This is done with one of the following functions Types and data structures. The following function will do the initialization only once, so it’s safe to call from multiple drivers:. The PCI bus needs to be initialized before it can be used.
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The list of vendor and device codes is not complete: When the device has been allocated memory space it can be activated. Specific config information But if the application is looking for a device of a given device class e.
Re: PCI Address Mapping
The number will be incremented as new busses are discovered. This function gets the PCI configuration information for the device indicated in devid.
The environment in which a platform operates will dictate if and how eCos should configure devices on the PCI bus. A device may generate interrupts. The above functions only allow access to generic PCI config registers. Allocate memory and IO space to all base address registers on all devices on the given bus and all subordinate busses.
Nick Garnett – Re: PCI Address Mapping
This may also depend on which slot the device occupies. Returns true if another device is found and false if not. The 64 bit type is used to allow handling 64 bit devices in the future, should it be necessary, without changing the library’s API.
After the bus has been initialized, it is possible to scan it for devices. This is not done by the library since a driver may have to initialize more state ecow the device before it can be safely activated.
Michael Kelly – Re: PCI Address Mapping
The loop terminates when no more devices are found on the bus. This is how the function is used in the pci1 test:.
The following function will do the initialization only once, so it’s safe to call from multiple drivers:. Normally these base addresses will be oci to default values based on the platform.
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. Read and change generic PCI information. The PCI bus needs to be initialized before it can be used. This only needs to be done once – some HALs may do it as part of the platform initialization procedure, other HALs may leave it to the application or device drivers to do it.
PCI Library reference This function returns true if a matching device is found and false if not. These macros define offsets to be added to the PCI scos addresses to translate PCI bus addresses into physical memory addresses that can be used to access the allocated memory or IO space.
If successful, true is returned.
Returns true if one is found and false if not. The low level API is used by pcii 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. What happens is that the bus gets initialized and a scan is started.
The devid serves as both an input and an output operand: Initialize the PCI library and establish contact with the hardware. Otherwise the result is false. Initializing the bus Activating a device 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.