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                             __FUNCTION__);
  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                                     __FUNCTION__, 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", __FUNCTION__);
  61                 else
  62                         err("%s failed to get sensor state\n", __FUNCTION__);
  63         }
  64         return rc;
  65 }
  66
  67 /**
  68  * get_pci_adapter_status - get the status of a slot
  69  *
  70  * 0-- slot is empty
  71  * 1-- adapter is configured
  72  * 2-- adapter is not configured
  73  * 3-- not valid
  74  */
  75 int rpaphp_get_pci_adapter_status(struct slot *slot, int is_init, u8 * value)
  76 {
  77         struct pci_bus *bus;
  78         int state, rc;
  79
  80         *value = NOT_VALID;
  81         rc = rpaphp_get_sensor_state(slot, &state);
  82         if (rc)
  83                 goto exit;
  84
  85         if (state == EMPTY)
  86                 *value = EMPTY;
  87         else if (state == PRESENT) {
  88                 if (!is_init) {
  89                         /* at run-time slot->state can be changed by */
  90                         /* config/unconfig adapter */
  91                         *value = slot->state;
  92                 } else {
  93                         bus = pcibios_find_pci_bus(slot->dn);
  94                         if (bus && !list_empty(&bus->devices))
  95                                 *value = CONFIGURED;
  96                         else
  97                                 *value = NOT_CONFIGURED;
  98                 }
  99         }
 100 exit:
 101         return rc;
 102 }
 103
 104 static void print_slot_pci_funcs(struct pci_bus *bus)
 105 {
 106         struct device_node *dn;
 107         struct pci_dev *dev;
 108
 109         dn = pci_bus_to_OF_node(bus);
 110         if (!dn)
 111                 return;
 112
 113         dbg("%s: pci_devs of slot[%s]\n", __FUNCTION__, dn->full_name);
 114         list_for_each_entry (dev, &bus->devices, bus_list)
 115                 dbg("\t%s\n", pci_name(dev));
 116         return;
 117 }
 118
 119 static int setup_pci_hotplug_slot_info(struct slot *slot)
 120 {
 121         struct hotplug_slot_info *hotplug_slot_info = slot->hotplug_slot->info;
 122
 123         dbg("%s Initilize the PCI slot's hotplug->info structure ...\n",
 124             __FUNCTION__);
 125         rpaphp_get_power_status(slot, &hotplug_slot_info->power_status);
 126         rpaphp_get_pci_adapter_status(slot, 1,
 127                                       &hotplug_slot_info->adapter_status);
 128         if (hotplug_slot_info->adapter_status == NOT_VALID) {
 129                 err("%s: NOT_VALID: skip dn->full_name=%s\n",
 130                     __FUNCTION__, slot->dn->full_name);
 131                 return -EINVAL;
 132         }
 133         return 0;
 134 }
 135
 136 static void set_slot_name(struct slot *slot)
 137 {
 138         struct pci_bus *bus = slot->bus;
 139         struct pci_dev *bridge;
 140
 141         bridge = bus->self;
 142         if (bridge)
 143                 strcpy(slot->name, pci_name(bridge));
 144         else
 145                 sprintf(slot->name, "%04x:%02x:00.0", pci_domain_nr(bus),
 146                         bus->number);
 147 }
 148
 149 static int setup_pci_slot(struct slot *slot)
 150 {
 151         struct device_node *dn = slot->dn;
 152         struct pci_bus *bus;
 153
 154         BUG_ON(!dn);
 155         bus = pcibios_find_pci_bus(dn);
 156         if (!bus) {
 157                 err("%s: no pci_bus for dn %s\n", __FUNCTION__, dn->full_name);
 158                 goto exit_rc;
 159         }
 160
 161         slot->bus = bus;
 162         slot->pci_devs = &bus->devices;
 163         set_slot_name(slot);
 164
 165         /* find slot's pci_dev if it's not empty */
 166         if (slot->hotplug_slot->info->adapter_status == EMPTY) {
 167                 slot->state = EMPTY;    /* slot is empty */
 168         } else {
 169                 /* slot is occupied */
 170                 if (!dn->child) {
 171                         /* non-empty slot has to have child */
 172                         err("%s: slot[%s]'s device_node doesn't have child for adapter\n",
 173                                 __FUNCTION__, slot->name);
 174                         goto exit_rc;
 175                 }
 176
 177                 if (slot->hotplug_slot->info->adapter_status == NOT_CONFIGURED) {
 178                         dbg("%s CONFIGURING pci adapter in slot[%s]\n",
 179                                 __FUNCTION__, slot->name);
 180                         pcibios_add_pci_devices(slot->bus);
 181
 182                 } else if (slot->hotplug_slot->info->adapter_status != CONFIGURED) {
 183                         err("%s: slot[%s]'s adapter_status is NOT_VALID.\n",
 184                                 __FUNCTION__, slot->name);
 185                         goto exit_rc;
 186                 }
 187                 print_slot_pci_funcs(slot->bus);
 188                 if (!list_empty(slot->pci_devs)) {
 189                         slot->state = CONFIGURED;
 190                 } else {
 191                         /* DLPAR add as opposed to
 192                          * boot time */
 193                         slot->state = NOT_CONFIGURED;
 194                 }
 195         }
 196         return 0;
 197 exit_rc:
 198         dealloc_slot_struct(slot);
 199         return -EINVAL;
 200 }
 201
 202 int rpaphp_register_pci_slot(struct slot *slot)
 203 {
 204         int rc = -EINVAL;
 205
 206         if (setup_pci_hotplug_slot_info(slot))
 207                 goto exit_rc;
 208         if (setup_pci_slot(slot))
 209                 goto exit_rc;
 210         rc = rpaphp_register_slot(slot);
 211 exit_rc:
 212         return rc;
 213 }
 214