drivers/pci/hotplug/rpaphp_vio.c

   1 /*
   2  * RPA Hot Plug Virtual I/O device functions
   3  * Copyright (C) 2004 Linda Xie <lxie@us.ibm.com>
   4  *
   5  * All rights reserved.
   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 (at
  10  * your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  15  * NON INFRINGEMENT.  See the GNU General Public License for more
  16  * details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  *
  22  * Send feedback to <lxie@us.ibm.com>
  23  *
  24  */
  25 #include <asm/vio.h>
  26 #include "rpaphp.h"
  27
  28 /*
  29  * get_vio_adapter_status - get  the status of a slot
  30  *
  31  * status:
  32  *
  33  * 1-- adapter is configured
  34  * 2-- adapter is not configured
  35  * 3-- not valid
  36  */
  37 inline int rpaphp_get_vio_adapter_status(struct slot *slot, int is_init, u8 *value)
  38 {
  39         *value = slot->state;
  40         return 0;
  41 }
  42
  43 int rpaphp_unconfig_vio_adapter(struct slot *slot)
  44 {
  45         int retval = 0;
  46
  47         dbg("Entry %s: slot[%s]\n", __FUNCTION__, slot->name);
  48         if (!slot->dev.vio_dev) {
  49                 info("%s: no VIOA in slot[%s]\n", __FUNCTION__, slot->name);
  50                 retval = -EINVAL;
  51                 goto exit;
  52         }
  53         /* remove the device from the vio core */
  54         vio_unregister_device(slot->dev.vio_dev);
  55         slot->state = NOT_CONFIGURED;
  56         info("%s: adapter in slot[%s] unconfigured.\n", __FUNCTION__, slot->name);
  57 exit:
  58         dbg("Exit %s, rc=0x%x\n", __FUNCTION__, retval);
  59         return retval;
  60 }
  61
  62 static int setup_vio_hotplug_slot_info(struct slot *slot)
  63 {
  64         slot->hotplug_slot->info->power_status = 1;
  65         rpaphp_get_vio_adapter_status(slot, 1,
  66                 &slot->hotplug_slot->info->adapter_status);
  67         return 0;
  68 }
  69
  70 int register_vio_slot(struct device_node *dn)
  71 {
  72         u32 *index;
  73         char *name;
  74         int rc = -EINVAL;
  75         struct slot *slot = NULL;
  76
  77         rc = rpaphp_get_drc_props(dn, NULL, &name, NULL, NULL);
  78         if (rc < 0)
  79                 goto exit_rc;
  80         index = (u32 *) get_property(dn, "ibm,my-drc-index", NULL);
  81         if (!index)
  82                 goto exit_rc;
  83         if (!(slot = alloc_slot_struct(dn, *index, name, 0))) {
  84                 rc = -ENOMEM;
  85                 goto exit_rc;
  86         }
  87         slot->dev_type = VIO_DEV;
  88         slot->dev.vio_dev = vio_find_node(dn);
  89         if (slot->dev.vio_dev) {
  90                 /*
  91                  * rpaphp is the only owner of vio devices and
  92                  * does not need extra reference taken by
  93                  * vio_find_node
  94                  */
  95                 put_device(&slot->dev.vio_dev->dev);
  96         } else
  97                 slot->dev.vio_dev = vio_register_device_node(dn);
  98         if (slot->dev.vio_dev)
  99                 slot->state = CONFIGURED;
 100         else
 101                 slot->state = NOT_CONFIGURED;
 102         if (setup_vio_hotplug_slot_info(slot))
 103                 goto exit_rc;
 104         strcpy(slot->name, slot->dev.vio_dev->dev.bus_id);
 105         info("%s: registered VIO device[name=%s vio_dev=%p]\n",
 106                 __FUNCTION__, slot->name, slot->dev.vio_dev);
 107         rc = register_slot(slot);
 108 exit_rc:
 109         if (rc && slot)
 110                 dealloc_slot_struct(slot);
 111         return (rc);
 112 }
 113
 114 int rpaphp_enable_vio_slot(struct slot *slot)
 115 {
 116         int retval = 0;
 117
 118         if ((slot->dev.vio_dev = vio_register_device_node(slot->dn))) {
 119                 info("%s: VIO adapter %s in slot[%s] has been configured\n",
 120                         __FUNCTION__, slot->dn->name, slot->name);
 121                 slot->state = CONFIGURED;
 122         } else {
 123                 info("%s: no vio_dev struct for adapter in slot[%s]\n",
 124                         __FUNCTION__, slot->name);
 125                 slot->state = NOT_CONFIGURED;
 126         }
 127
 128         return retval;
 129 }