iseries_pci_reset.c

这个linux源代码是很全面的~基本完整了~使用c编译的~由于时间问题我没有亲自测试~但就算用来做参考资料也是非常好的

/************************************************************************/
/* File iSeries_pci_reset.c created by Allan Trautman on Mar 21 2001.   */
/************************************************************************/
/* This code supports the pci interface on the IBM iSeries systems.     */
/* Copyright (C) 20yy  <Allan H Trautman> <IBM Corp>                    */
/*                                                                      */
/* This program is free software; you can redistribute it and/or modify */
/* it under the terms of the GNU General Public License as published by */
/* the Free Software Foundation; either version 2 of the License, or    */
/* (at your option) any later version.                                  */
/*                                                                      */
/* This program is distributed in the hope that it will be useful,      */ 
/* but WITHOUT ANY WARRANTY; without even the implied warranty of       */
/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the        */
/* GNU General Public License for more details.                         */
/*                                                                      */
/* You should have received a copy of the GNU General Public License    */ 
/* along with this program; if not, write to the:                       */
/* Free Software Foundation, Inc.,                                      */ 
/* 59 Temple Place, Suite 330,                                          */ 
/* Boston, MA  02111-1307  USA                                          */
/************************************************************************/
/* Change Activity:                                                     */
/*   Created, March 20, 2001                                            */
/*   April 30, 2001, Added return codes on functions.                   */
/*   September 10, 2001, Ported to ppc64.                               */
/* End Change Activity                                                  */
/************************************************************************/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/irq.h>

#include <asm/io.h>
#include <asm/init.h>
#include <asm/iSeries/HvCallPci.h>
#include <asm/iSeries/HvTypes.h>
#include <asm/iSeries/mf.h>
#include <asm/flight_recorder.h>
#include <asm/pci.h>

#include <asm/iSeries/iSeries_pci.h>
#include "pci.h"

/************************************************************************/
/* Interface to toggle the reset line                                   */
/* Time is in .1 seconds, need for seconds.                             */
/************************************************************************/
int  iSeries_Device_ToggleReset(struct pci_dev* PciDev, int AssertTime, int DelayTime)
{
	unsigned long AssertDelay, WaitDelay;
	struct iSeries_Device_Node* DeviceNode = (struct iSeries_Device_Node*)PciDev->sysdata;
 	if (DeviceNode == NULL) { 
		printk("PCI: Pci Reset Failed, Device Node not found for pci_dev %p\n",PciDev);
		return -1;
	}
	/********************************************************************
	 * Set defaults, Assert is .5 second, Wait is 3 seconds.
	 ********************************************************************/
	if (AssertTime == 0) AssertDelay = ( 5 * HZ)/10;
	else                 AssertDelay = (AssertTime*HZ)/10;
	if (WaitDelay == 0)  WaitDelay   = (30 * HZ)/10;
	else                 WaitDelay   = (DelayTime* HZ)/10;

	/********************************************************************
	 * Assert reset
	 ********************************************************************/
	DeviceNode->ReturnCode = HvCallPci_setSlotReset(ISERIES_BUS(DeviceNode),0x00,DeviceNode->AgentId,1);
	if (DeviceNode->ReturnCode == 0) {
		set_current_state(TASK_UNINTERRUPTIBLE);
		schedule_timeout(AssertDelay);       /* Sleep for the time     */
		DeviceNode->ReturnCode = HvCallPci_setSlotReset(ISERIES_BUS(DeviceNode),0x00,DeviceNode->AgentId, 0);

		/***************************************************************
   		 * Wait for device to reset
		 ***************************************************************/
		set_current_state(TASK_UNINTERRUPTIBLE);  
		schedule_timeout(WaitDelay);
	}
	if (DeviceNode->ReturnCode == 0) {
		PCIFR("Slot 0x%04X.%02X Reset\n",ISERIES_BUS(DeviceNode),DeviceNode->AgentId );
	} 
	else {
		printk("PCI: Slot 0x%04X.%02X Reset Failed, RCode: %04X\n",ISERIES_BUS(DeviceNode),DeviceNode->AgentId,DeviceNode->ReturnCode);
		PCIFR(      "Slot 0x%04X.%02X Reset Failed, RCode: %04X\n",ISERIES_BUS(DeviceNode),DeviceNode->AgentId,DeviceNode->ReturnCode);
	}
	return DeviceNode->ReturnCode;
}