PMC-Sierra PM5358 S/UNI 4x622 manual Interrupt Servicing, Suni4x622AddInitProfile

PM5358 S/UNI-4x622 Driver Manual

Software Architecture

Figure 5: Device Management Flow Diagram

START

suni4x622Add

suni4x622Init

suni4x622Activate

suni4x622Reset

suni4x622DeActivate

suni4x622Reset

suni4x622Delete

Detects the new device in hardware, assigns a DDB to the new device andstores the user's context for the device. Returns a device handle to the user

Applies a reset to the device and initializes the device registers and associated RAMs based on the DIV passed by the user. The user may only pass a profile number, which corresponds to a previously saved & validated set of configurations (by using

suni4x622AddInitProfile)

Prepares the device for normal operation by enabling interrupts and other global enables. ISR routines are installed when the module is started using sysSuni4x622ISRHandlerInstall. The device is now operational and all other API can be invoked.

In order to re-initialize the device, reset the device using suni4x622Reset and go through the initialization sequence again.

De-activates the device and removes it from normal operation. This involves disabling the device interrupts. ISR routines for this

device are removed usingsysSuni4x622ISRHandlerRemove when the module is closed.

Applies a software reset to the device to put it in its default startup state.

Removes the device from the list of devices being controlled by the S/UNI-4x622 driver. This function de-allocates the device context information for the device being deleted.

END

2.5Interrupt Servicing

The S/UNI-4x622 driver services device interrupts using an Interrupt-Service Routine (ISR) that traps interrupts, and a Deferred-Processing Routine (DPR) that actually processes the interrupt conditions and clears them. This lets the ISR execute quickly and exit. Most of the time-consuming processing of the interrupt conditions is deferred to the DPR by queuing the necessary interrupt-context information to the DPR task. The DPR function runs in the context of a separate task within the RTOS.

Note: Since the DPR task processes potentially serious interrupt conditions, you should set the DPR task’s priority higher than the application task interacting with the S/UNI-4x622 driver.

Proprietary and Confidential to PMC-Sierra, Inc.	22
Document ID: PMC-2010419, Issue 1