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_config_pci_adapter(struct pci_bus *bus) 120 { 121 struct device_node *dn = pci_bus_to_OF_node(bus); 122 int rc = -ENODEV; 123 124 dbg("Entry %s: slot[%s]\n", __FUNCTION__, dn->full_name); 125 if (!dn) 126 goto exit; 127 128 pcibios_add_pci_devices(bus); 129 print_slot_pci_funcs(bus); 130 rc = 0; 131 exit: 132 dbg("Exit %s: rc=%d\n", __FUNCTION__, rc); 133 return rc; 134 } 135 EXPORT_SYMBOL_GPL(rpaphp_config_pci_adapter); 136 137 static void rpaphp_eeh_remove_bus_device(struct pci_dev *dev) 138 { 139 eeh_remove_device(dev); 140 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) { 141 struct pci_bus *bus = dev->subordinate; 142 struct list_head *ln; 143 if (!bus) 144 return; 145 for (ln = bus->devices.next; ln != &bus->devices; ln = ln->next) { 146 struct pci_dev *pdev = pci_dev_b(ln); 147 if (pdev) 148 rpaphp_eeh_remove_bus_device(pdev); 149 } 150 151 } 152 return; 153 } 154 155 int rpaphp_unconfig_pci_adapter(struct pci_bus *bus) 156 { 157 struct pci_dev *dev, *tmp; 158 159 list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) { 160 rpaphp_eeh_remove_bus_device(dev); 161 pci_remove_bus_device(dev); 162 } 163 return 0; 164 } 165 EXPORT_SYMBOL_GPL(rpaphp_unconfig_pci_adapter); 166 167 static int setup_pci_hotplug_slot_info(struct slot *slot) 168 { 169 struct hotplug_slot_info *hotplug_slot_info = slot->hotplug_slot->info; 170 171 dbg("%s Initilize the PCI slot's hotplug->info structure ...\n", 172 __FUNCTION__); 173 rpaphp_get_power_status(slot, &hotplug_slot_info->power_status); 174 rpaphp_get_pci_adapter_status(slot, 1, 175 &hotplug_slot_info->adapter_status); 176 if (hotplug_slot_info->adapter_status == NOT_VALID) { 177 err("%s: NOT_VALID: skip dn->full_name=%s\n", 178 __FUNCTION__, slot->dn->full_name); 179 return -EINVAL; 180 } 181 return 0; 182 } 183 184 static void set_slot_name(struct slot *slot) 185 { 186 struct pci_bus *bus = slot->bus; 187 struct pci_dev *bridge; 188 189 bridge = bus->self; 190 if (bridge) 191 strcpy(slot->name, pci_name(bridge)); 192 else 193 sprintf(slot->name, "%04x:%02x:00.0", pci_domain_nr(bus), 194 bus->number); 195 } 196 197 static int setup_pci_slot(struct slot *slot) 198 { 199 struct device_node *dn = slot->dn; 200 struct pci_bus *bus; 201 202 BUG_ON(!dn); 203 bus = pcibios_find_pci_bus(dn); 204 if (!bus) { 205 err("%s: no pci_bus for dn %s\n", __FUNCTION__, dn->full_name); 206 goto exit_rc; 207 } 208 209 slot->bus = bus; 210 slot->pci_devs = &bus->devices; 211 set_slot_name(slot); 212 213 /* find slot's pci_dev if it's not empty */ 214 if (slot->hotplug_slot->info->adapter_status == EMPTY) { 215 slot->state = EMPTY; /* slot is empty */ 216 } else { 217 /* slot is occupied */ 218 if (!dn->child) { 219 /* non-empty slot has to have child */ 220 err("%s: slot[%s]'s device_node doesn't have child for adapter\n", 221 __FUNCTION__, slot->name); 222 goto exit_rc; 223 } 224 225 if (slot->hotplug_slot->info->adapter_status == NOT_CONFIGURED) { 226 dbg("%s CONFIGURING pci adapter in slot[%s]\n", 227 __FUNCTION__, slot->name); 228 if (rpaphp_config_pci_adapter(slot->bus)) { 229 err("%s: CONFIG pci adapter failed\n", __FUNCTION__); 230 goto exit_rc; 231 } 232 233 } else if (slot->hotplug_slot->info->adapter_status != CONFIGURED) { 234 err("%s: slot[%s]'s adapter_status is NOT_VALID.\n", 235 __FUNCTION__, slot->name); 236 goto exit_rc; 237 } 238 print_slot_pci_funcs(slot->bus); 239 if (!list_empty(slot->pci_devs)) { 240 slot->state = CONFIGURED; 241 } else { 242 /* DLPAR add as opposed to 243 * boot time */ 244 slot->state = NOT_CONFIGURED; 245 } 246 } 247 return 0; 248 exit_rc: 249 dealloc_slot_struct(slot); 250 return -EINVAL; 251 } 252 253 int register_pci_slot(struct slot *slot) 254 { 255 int rc = -EINVAL; 256 257 if (setup_pci_hotplug_slot_info(slot)) 258 goto exit_rc; 259 if (setup_pci_slot(slot)) 260 goto exit_rc; 261 rc = register_slot(slot); 262 exit_rc: 263 return rc; 264 } 265 266 int rpaphp_enable_pci_slot(struct slot *slot) 267 { 268 int retval = 0, state; 269 270 retval = rpaphp_get_sensor_state(slot, &state); 271 if (retval) 272 goto exit; 273 dbg("%s: sensor state[%d]\n", __FUNCTION__, state); 274 /* if slot is not empty, enable the adapter */ 275 if (state == PRESENT) { 276 dbg("%s : slot[%s] is occupied.\n", __FUNCTION__, slot->name); 277 retval = rpaphp_config_pci_adapter(slot->bus); 278 if (!retval) { 279 slot->state = CONFIGURED; 280 info("%s: devices in slot[%s] configured\n", 281 __FUNCTION__, slot->name); 282 } else { 283 slot->state = NOT_CONFIGURED; 284 dbg("%s: no pci_dev struct for adapter in slot[%s]\n", 285 __FUNCTION__, slot->name); 286 } 287 } else if (state == EMPTY) { 288 dbg("%s : slot[%s] is empty\n", __FUNCTION__, slot->name); 289 slot->state = EMPTY; 290 } else { 291 err("%s: slot[%s] is in invalid state\n", __FUNCTION__, 292 slot->name); 293 slot->state = NOT_VALID; 294 retval = -EINVAL; 295 } 296 exit: 297 dbg("%s - Exit: rc[%d]\n", __FUNCTION__, retval); 298 return retval; 299 } 300