cpqfctstrigger.c

讲述linux的初始化过程

// Routine to trigger Finisar GTA analyzer. Runs of GPIO2
// NOTE: DEBUG ONLY! Could interfere with FCMNGR/Miniport operation
// since it writes directly to the Tachyon board.  This function
// developed for Compaq HBA Tachyon TS v1.2 (Rev X5 PCB)

#include <linux/kernel.h>
#include <linux/ioport.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <asm/io.h>


void TriggerHBA( void* IOBaseUpper, int Print)
{
  __u32 long value;

  // get initial value in hopes of not modifying any other GPIO line
  IOBaseUpper += 0x188;  // TachTL/TS Control reg
  
  value = readl( IOBaseUpper);
  // set HIGH to trigger external analyzer (tested on Dolche Finisar 1Gb GTA)
  // The Finisar anaylzer triggers on low-to-high TTL transition
  value |= 0x01; // set bit 0

  writel( value, IOBaseUpper);

  if( Print)
    printk( " -GPIO0 set- ");
}