arch/ppc64/kernel/iSeries_pci_reset.c

   1 /************************************************************************/
   2 /* File iSeries_pci_reset.c created by Allan Trautman on Mar 21 2001.   */
   3 /************************************************************************/
   4 /* This code supports the pci interface on the IBM iSeries systems.     */
   5 /* Copyright (C) 20yy  <Allan H Trautman> <IBM Corp>                    */
   6 /*                                                                      */
   7 /* This program is free software; you can redistribute it and/or modify */
   8 /* it under the terms of the GNU General Public License as published by */
   9 /* the Free Software Foundation; either version 2 of the License, or    */
  10 /* (at your option) any later version.                                  */
  11 /*                                                                      */
  12 /* This program is distributed in the hope that it will be useful,      */
  13 /* but WITHOUT ANY WARRANTY; without even the implied warranty of       */
  14 /* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the        */
  15 /* GNU General Public License for more details.                         */
  16 /*                                                                      */
  17 /* You should have received a copy of the GNU General Public License    */
  18 /* along with this program; if not, write to the:                       */
  19 /* Free Software Foundation, Inc.,                                      */
  20 /* 59 Temple Place, Suite 330,                                          */
  21 /* Boston, MA  02111-1307  USA                                          */
  22 /************************************************************************/
  23 /* Change Activity:                                                     */
  24 /*   Created, March 20, 2001                                            */
  25 /*   April 30, 2001, Added return codes on functions.                   */
  26 /*   September 10, 2001, Ported to ppc64.                               */
  27 /* End Change Activity                                                  */
  28 /************************************************************************/
  29 #include <linux/kernel.h>
  30 #include <linux/init.h>
  31 #include <linux/pci.h>
  32 #include <linux/irq.h>
  33
  34 #include <asm/io.h>
  35 #include <asm/init.h>
  36 #include <asm/iSeries/HvCallPci.h>
  37 #include <asm/iSeries/HvTypes.h>
  38 #include <asm/iSeries/mf.h>
  39 #include <asm/flight_recorder.h>
  40 #include <asm/pci.h>
  41
  42 #include <asm/iSeries/iSeries_pci.h>
  43 #include "pci.h"
  44
  45 /************************************************************************/
  46 /* Interface to toggle the reset line                                   */
  47 /* Time is in .1 seconds, need for seconds.                             */
  48 /************************************************************************/
  49 int  iSeries_Device_ToggleReset(struct pci_dev* PciDev, int AssertTime, int DelayTime)
  50 {
  51         unsigned long AssertDelay, WaitDelay;
  52         struct iSeries_Device_Node* DeviceNode = (struct iSeries_Device_Node*)PciDev->sysdata;
  53         if (DeviceNode == NULL) {
  54                 printk("PCI: Pci Reset Failed, Device Node not found for pci_dev %p\n",PciDev);
  55                 return -1;
  56         }
  57         /********************************************************************
  58          * Set defaults, Assert is .5 second, Wait is 3 seconds.
  59          ********************************************************************/
  60         if (AssertTime == 0) AssertDelay = ( 5 * HZ)/10;
  61         else                 AssertDelay = (AssertTime*HZ)/10;
  62         if (WaitDelay == 0)  WaitDelay   = (30 * HZ)/10;
  63         else                 WaitDelay   = (DelayTime* HZ)/10;
  64
  65         /********************************************************************
  66          * Assert reset
  67          ********************************************************************/
  68         DeviceNode->ReturnCode = HvCallPci_setSlotReset(ISERIES_BUS(DeviceNode),0x00,DeviceNode->AgentId,1);
  69         if (DeviceNode->ReturnCode == 0) {
  70                 set_current_state(TASK_UNINTERRUPTIBLE);
  71                 schedule_timeout(AssertDelay);       /* Sleep for the time     */
  72                 DeviceNode->ReturnCode = HvCallPci_setSlotReset(ISERIES_BUS(DeviceNode),0x00,DeviceNode->AgentId, 0);
  73
  74                 /***************************************************************
  75                  * Wait for device to reset
  76                  ***************************************************************/
  77                 set_current_state(TASK_UNINTERRUPTIBLE);
  78                 schedule_timeout(WaitDelay);
  79         }
  80         if (DeviceNode->ReturnCode == 0) {
  81                 PCIFR("Slot 0x%04X.%02X Reset\n",ISERIES_BUS(DeviceNode),DeviceNode->AgentId );
  82         }
  83         else {
  84                 printk("PCI: Slot 0x%04X.%02X Reset Failed, RCode: %04X\n",ISERIES_BUS(DeviceNode),DeviceNode->AgentId,DeviceNode->ReturnCode);
  85                 PCIFR(      "Slot 0x%04X.%02X Reset Failed, RCode: %04X\n",ISERIES_BUS(DeviceNode),DeviceNode->AgentId,DeviceNode->ReturnCode);
  86         }
  87         return DeviceNode->ReturnCode;
  88 }