Searches the PCI bus configuration space for a device with the given vendor and device ids. It is possible for an application to override these using the following functions:. In this case the driver will need to know how to access the region in segments. This function sets the PCI configuration information for the device indicated in devid. The PCI standard supports up to busses with each bus having up to 32 devices and each device having up to 8 functions.
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If the function returns false, no interrupts will be generated by the device. Otherwise the result is false. The command register can also be written to, controlling among other things whether the device responds to IO and memory access from the bus.
Chapter The eCos PCI Library
This is how the function is used in the pci1 test:. The devid serves as both an input and an output operand: These functions read registers of the appropriate size from the configuration space of the given device. For 32 bit PCI memory regions, each 32 bit word will be an actual pointer that can be used exos by the driver: 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.
Allocate memory and IO space to all base address registers on all devices on the given bus and all subordinate busses. It is possible for ecso application to override these using the following functions:.
These can be accessed with these functions:. It should not be necessary to use these macros under normal circumstances. Searches the PCI bus configuration space for a device with the given vendor and device ids.
Only the configuration space registers that are writable are actually written. The environment in which a platform operates will dictate if and how eCos should configure devices on the PCI bus.
Re: PCI Address Mapping
The bases are initialized with default values provided by the HAL. When the device has been allocated memory space it can be activated.
Specific config information The PCI standard supports up to busses with each bus having up to 32 devices and each device having up to 8 functions. This is provided by two APIs.
Normally these base addresses will be set to default values based on the platform. If the call returns truea loop is entered where the found devid is used.
The number will be incremented as new busses are discovered. The memory bases in two distinct address spaces are increased as memory regions are allocated to devices. Initializing the bus This function allows a driver to find the actual interrupt vector for a given device:.
Otherwise, false is returned. Scan the PCI bus for specific devices or devices of a certain class. They should mainly be used to access registers that are device specific. This function interrogates the device and determines which HAL interrupt vector it is connected to.
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.
If the platform acts as a host on a single PCI bus, then devices may be configured individually from the relevant device driver. 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.
Because of the nature of bridge devices, all devices on the secondary side of a bridge must be allocated memory and IO space before the memory and IO windows on the bridge device can be properly configured. Read a value from the PCI configuration space of the appropriate size at an address composed from the busdevfn and offset. Read and change pcj PCI information.