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 static 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 int rpaphp_unconfig_pci_adapter(struct pci_bus *bus) 120 { 121 struct pci_dev *dev, *tmp; 122 123 list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) { 124 eeh_remove_bus_device(dev); 125 pci_remove_bus_device(dev); 126 } 127 return 0; 128 } 129 EXPORT_SYMBOL_GPL(rpaphp_unconfig_pci_adapter); 130 131 static int setup_pci_hotplug_slot_info(struct slot *slot) 132 { 133 struct hotplug_slot_info *hotplug_slot_info = slot->hotplug_slot->info; 134 135 dbg("%s Initilize the PCI slot's hotplug->info structure ...\n", 136 __FUNCTION__); 137 rpaphp_get_power_status(slot, &hotplug_slot_info->power_status); 138 rpaphp_get_pci_adapter_status(slot, 1, 139 &hotplug_slot_info->adapter_status); 140 if (hotplug_slot_info->adapter_status == NOT_VALID) { 141 err("%s: NOT_VALID: skip dn->full_name=%s\n", 142 __FUNCTION__, slot->dn->full_name); 143 return -EINVAL; 144 } 145 return 0; 146 } 147 148 static void set_slot_name(struct slot *slot) 149 { 150 struct pci_bus *bus = slot->bus; 151 struct pci_dev *bridge; 152 153 bridge = bus->self; 154 if (bridge) 155 strcpy(slot->name, pci_name(bridge)); 156 else 157 sprintf(slot->name, "%04x:%02x:00.0", pci_domain_nr(bus), 158 bus->number); 159 } 160 161 static int setup_pci_slot(struct slot *slot) 162 { 163 struct device_node *dn = slot->dn; 164 struct pci_bus *bus; 165 166 BUG_ON(!dn); 167 bus = pcibios_find_pci_bus(dn); 168 if (!bus) { 169 err("%s: no pci_bus for dn %s\n", __FUNCTION__, dn->full_name); 170 goto exit_rc; 171 } 172 173 slot->bus = bus; 174 slot->pci_devs = &bus->devices; 175 set_slot_name(slot); 176 177 /* find slot's pci_dev if it's not empty */ 178 if (slot->hotplug_slot->info->adapter_status == EMPTY) { 179 slot->state = EMPTY; /* slot is empty */ 180 } else { 181 /* slot is occupied */ 182 if (!dn->child) { 183 /* non-empty slot has to have child */ 184 err("%s: slot[%s]'s device_node doesn't have child for adapter\n", 185 __FUNCTION__, slot->name); 186 goto exit_rc; 187 } 188 189 if (slot->hotplug_slot->info->adapter_status == NOT_CONFIGURED) { 190 dbg("%s CONFIGURING pci adapter in slot[%s]\n", 191 __FUNCTION__, slot->name); 192 pcibios_add_pci_devices(slot->bus); 193 194 } else if (slot->hotplug_slot->info->adapter_status != CONFIGURED) { 195 err("%s: slot[%s]'s adapter_status is NOT_VALID.\n", 196 __FUNCTION__, slot->name); 197 goto exit_rc; 198 } 199 print_slot_pci_funcs(slot->bus); 200 if (!list_empty(slot->pci_devs)) { 201 slot->state = CONFIGURED; 202 } else { 203 /* DLPAR add as opposed to 204 * boot time */ 205 slot->state = NOT_CONFIGURED; 206 } 207 } 208 return 0; 209 exit_rc: 210 dealloc_slot_struct(slot); 211 return -EINVAL; 212 } 213 214 int register_pci_slot(struct slot *slot) 215 { 216 int rc = -EINVAL; 217 218 if (setup_pci_hotplug_slot_info(slot)) 219 goto exit_rc; 220 if (setup_pci_slot(slot)) 221 goto exit_rc; 222 rc = register_slot(slot); 223 exit_rc: 224 return rc; 225 } 226 227 int rpaphp_enable_pci_slot(struct slot *slot) 228 { 229 int retval = 0, state; 230 231 retval = rpaphp_get_sensor_state(slot, &state); 232 if (retval) 233 goto exit; 234 dbg("%s: sensor state[%d]\n", __FUNCTION__, state); 235 /* if slot is not empty, enable the adapter */ 236 if (state == PRESENT) { 237 dbg("%s : slot[%s] is occupied.\n", __FUNCTION__, slot->name); 238 pcibios_add_pci_devices(slot->bus); 239 slot->state = CONFIGURED; 240 info("%s: devices in slot[%s] configured\n", 241 __FUNCTION__, slot->name); 242 } else if (state == EMPTY) { 243 dbg("%s : slot[%s] is empty\n", __FUNCTION__, slot->name); 244 slot->state = EMPTY; 245 } else { 246 err("%s: slot[%s] is in invalid state\n", __FUNCTION__, 247 slot->name); 248 slot->state = NOT_VALID; 249 retval = -EINVAL; 250 } 251 exit: 252 dbg("%s - Exit: rc[%d]\n", __FUNCTION__, retval); 253 return retval; 254 } 255