drivers/pci/hotplug/rpaphp_pci.c

   1 /*
   2  * PCI Hot Plug Controller Driver for RPA-compliant PPC64 platform.
   3  * Copyright (C) 2003 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 <linux/pci.h>
  26 #include <linux/string.h>
  27
  28 #include <asm/pci-bridge.h>
  29 #include <asm/rtas.h>
  30 #include <asm/machdep.h>
  31
  32 #include "../pci.h"             /* for pci_add_new_bus */
  33 #include "rpaphp.h"
  34
  35 int rpaphp_get_sensor_state(struct slot *slot, int *state)
  36 {
  37         int rc;
  38         int setlevel;
  39
  40         rc = rtas_get_sensor(DR_ENTITY_SENSE, slot->index, state);
  41
  42         if (rc < 0) {
  43                 if (rc == -EFAULT || rc == -EEXIST) {
  44                         dbg("%s: slot must be power up to get sensor-state\n",
  45                             __func__);
  46
  47                         /* some slots have to be powered up
  48                          * before get-sensor will succeed.
  49                          */
  50                         rc = rtas_set_power_level(slot->power_domain, POWER_ON,
  51                                                   &setlevel);
  52                         if (rc < 0) {
  53                                 dbg("%s: power on slot[%s] failed rc=%d.\n",
  54                                     __func__, slot->name, rc);
  55                         } else {
  56                                 rc = rtas_get_sensor(DR_ENTITY_SENSE,
  57                                                      slot->index, state);
  58                         }
  59                 } else if (rc == -ENODEV)
  60                         info("%s: slot is unusable\n", __func__);
  61                 else
  62                         err("%s failed to get sensor state\n", __func__);
  63         }
  64         return rc;
  65 }
  66
  67 /**
  68  * rpaphp_enable_slot - record slot state, config pci device
  69  * @slot: target &slot
  70  *
  71  * Initialize values in the slot, and the hotplug_slot info
  72  * structures to indicate if there is a pci card plugged into
  73  * the slot. If the slot is not empty, run the pcibios routine
  74  * to get pcibios stuff correctly set up.
  75  */
  76 int rpaphp_enable_slot(struct slot *slot)
  77 {
  78         int rc, level, state;
  79         struct pci_bus *bus;
  80         struct hotplug_slot_info *info = slot->hotplug_slot->info;
  81
  82         info->adapter_status = NOT_VALID;
  83         slot->state = EMPTY;
  84
  85         /* Find out if the power is turned on for the slot */
  86         rc = rtas_get_power_level(slot->power_domain, &level);
  87         if (rc)
  88                 return rc;
  89         info->power_status = level;
  90
  91         /* Figure out if there is an adapter in the slot */
  92         rc = rpaphp_get_sensor_state(slot, &state);
  93         if (rc)
  94                 return rc;
  95
  96         bus = pcibios_find_pci_bus(slot->dn);
  97         if (!bus) {
  98                 err("%s: no pci_bus for dn %s\n", __func__, slot->dn->full_name);
  99                 return -EINVAL;
 100         }
 101
 102         info->adapter_status = EMPTY;
 103         slot->bus = bus;
 104         slot->pci_devs = &bus->devices;
 105
 106         /* if there's an adapter in the slot, go add the pci devices */
 107         if (state == PRESENT) {
 108                 info->adapter_status = NOT_CONFIGURED;
 109                 slot->state = NOT_CONFIGURED;
 110
 111                 /* non-empty slot has to have child */
 112                 if (!slot->dn->child) {
 113                         err("%s: slot[%s]'s device_node doesn't have child for adapter\n",
 114                             __func__, slot->name);
 115                         return -EINVAL;
 116                 }
 117
 118                 if (list_empty(&bus->devices))
 119                         pcibios_add_pci_devices(bus);
 120
 121                 if (!list_empty(&bus->devices)) {
 122                         info->adapter_status = CONFIGURED;
 123                         slot->state = CONFIGURED;
 124                 }
 125
 126                 if (rpaphp_debug) {
 127                         struct pci_dev *dev;
 128                         dbg("%s: pci_devs of slot[%s]\n", __func__, slot->dn->full_name);
 129                         list_for_each_entry (dev, &bus->devices, bus_list)
 130                                 dbg("\t%s\n", pci_name(dev));
 131                 }
 132         }
 133
 134         return 0;
 135 }