1 /* 2 * PCI Express Hot Plug Controller Driver 3 * 4 * Copyright (C) 1995,2001 Compaq Computer Corporation 5 * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com) 6 * Copyright (C) 2001 IBM Corp. 7 * Copyright (C) 2003-2004 Intel Corporation 8 * 9 * All rights reserved. 10 * 11 * This program is free software; you can redistribute it and/or modify 12 * it under the terms of the GNU General Public License as published by 13 * the Free Software Foundation; either version 2 of the License, or (at 14 * your option) any later version. 15 * 16 * This program is distributed in the hope that it will be useful, but 17 * WITHOUT ANY WARRANTY; without even the implied warranty of 18 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or 19 * NON INFRINGEMENT. See the GNU General Public License for more 20 * details. 21 * 22 * You should have received a copy of the GNU General Public License 23 * along with this program; if not, write to the Free Software 24 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 25 * 26 * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com> 27 * 28 * Authors: 29 * Dan Zink <dan.zink@compaq.com> 30 * Greg Kroah-Hartman <greg@kroah.com> 31 * Dely Sy <dely.l.sy@intel.com>" 32 */ 33 34 #include <linux/moduleparam.h> 35 #include <linux/kernel.h> 36 #include <linux/slab.h> 37 #include <linux/types.h> 38 #include <linux/pci.h> 39 #include "pciehp.h" 40 #include <linux/interrupt.h> 41 #include <linux/time.h> 42 43 /* Global variables */ 44 bool pciehp_debug; 45 bool pciehp_poll_mode; 46 int pciehp_poll_time; 47 static bool pciehp_force; 48 49 /* 50 * not really modular, but the easiest way to keep compat with existing 51 * bootargs behaviour is to continue using module_param here. 52 */ 53 module_param(pciehp_debug, bool, 0644); 54 module_param(pciehp_poll_mode, bool, 0644); 55 module_param(pciehp_poll_time, int, 0644); 56 module_param(pciehp_force, bool, 0644); 57 MODULE_PARM_DESC(pciehp_debug, "Debugging mode enabled or not"); 58 MODULE_PARM_DESC(pciehp_poll_mode, "Using polling mechanism for hot-plug events or not"); 59 MODULE_PARM_DESC(pciehp_poll_time, "Polling mechanism frequency, in seconds"); 60 MODULE_PARM_DESC(pciehp_force, "Force pciehp, even if OSHP is missing"); 61 62 #define PCIE_MODULE_NAME "pciehp" 63 64 static int set_attention_status(struct hotplug_slot *slot, u8 value); 65 static int enable_slot(struct hotplug_slot *slot); 66 static int disable_slot(struct hotplug_slot *slot); 67 static int get_power_status(struct hotplug_slot *slot, u8 *value); 68 static int get_attention_status(struct hotplug_slot *slot, u8 *value); 69 static int get_latch_status(struct hotplug_slot *slot, u8 *value); 70 static int get_adapter_status(struct hotplug_slot *slot, u8 *value); 71 static int reset_slot(struct hotplug_slot *slot, int probe); 72 73 /** 74 * release_slot - free up the memory used by a slot 75 * @hotplug_slot: slot to free 76 */ 77 static void release_slot(struct hotplug_slot *hotplug_slot) 78 { 79 kfree(hotplug_slot->ops); 80 kfree(hotplug_slot->info); 81 kfree(hotplug_slot); 82 } 83 84 static int init_slot(struct controller *ctrl) 85 { 86 struct slot *slot = ctrl->slot; 87 struct hotplug_slot *hotplug = NULL; 88 struct hotplug_slot_info *info = NULL; 89 struct hotplug_slot_ops *ops = NULL; 90 char name[SLOT_NAME_SIZE]; 91 int retval = -ENOMEM; 92 93 hotplug = kzalloc(sizeof(*hotplug), GFP_KERNEL); 94 if (!hotplug) 95 goto out; 96 97 info = kzalloc(sizeof(*info), GFP_KERNEL); 98 if (!info) 99 goto out; 100 101 /* Setup hotplug slot ops */ 102 ops = kzalloc(sizeof(*ops), GFP_KERNEL); 103 if (!ops) 104 goto out; 105 106 ops->enable_slot = enable_slot; 107 ops->disable_slot = disable_slot; 108 ops->get_power_status = get_power_status; 109 ops->get_adapter_status = get_adapter_status; 110 ops->reset_slot = reset_slot; 111 if (MRL_SENS(ctrl)) 112 ops->get_latch_status = get_latch_status; 113 if (ATTN_LED(ctrl)) { 114 ops->get_attention_status = get_attention_status; 115 ops->set_attention_status = set_attention_status; 116 } else if (ctrl->pcie->port->hotplug_user_indicators) { 117 ops->get_attention_status = pciehp_get_raw_indicator_status; 118 ops->set_attention_status = pciehp_set_raw_indicator_status; 119 } 120 121 /* register this slot with the hotplug pci core */ 122 hotplug->info = info; 123 hotplug->private = slot; 124 hotplug->release = &release_slot; 125 hotplug->ops = ops; 126 slot->hotplug_slot = hotplug; 127 snprintf(name, SLOT_NAME_SIZE, "%u", PSN(ctrl)); 128 129 retval = pci_hp_register(hotplug, 130 ctrl->pcie->port->subordinate, 0, name); 131 if (retval) 132 ctrl_err(ctrl, "pci_hp_register failed: error %d\n", retval); 133 out: 134 if (retval) { 135 kfree(ops); 136 kfree(info); 137 kfree(hotplug); 138 } 139 return retval; 140 } 141 142 static void cleanup_slot(struct controller *ctrl) 143 { 144 pci_hp_deregister(ctrl->slot->hotplug_slot); 145 } 146 147 /* 148 * set_attention_status - Turns the Amber LED for a slot on, off or blink 149 */ 150 static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status) 151 { 152 struct slot *slot = hotplug_slot->private; 153 154 pciehp_set_attention_status(slot, status); 155 return 0; 156 } 157 158 159 static int enable_slot(struct hotplug_slot *hotplug_slot) 160 { 161 struct slot *slot = hotplug_slot->private; 162 163 return pciehp_sysfs_enable_slot(slot); 164 } 165 166 167 static int disable_slot(struct hotplug_slot *hotplug_slot) 168 { 169 struct slot *slot = hotplug_slot->private; 170 171 return pciehp_sysfs_disable_slot(slot); 172 } 173 174 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value) 175 { 176 struct slot *slot = hotplug_slot->private; 177 178 pciehp_get_power_status(slot, value); 179 return 0; 180 } 181 182 static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value) 183 { 184 struct slot *slot = hotplug_slot->private; 185 186 pciehp_get_attention_status(slot, value); 187 return 0; 188 } 189 190 static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value) 191 { 192 struct slot *slot = hotplug_slot->private; 193 194 pciehp_get_latch_status(slot, value); 195 return 0; 196 } 197 198 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value) 199 { 200 struct slot *slot = hotplug_slot->private; 201 202 pciehp_get_adapter_status(slot, value); 203 return 0; 204 } 205 206 static int reset_slot(struct hotplug_slot *hotplug_slot, int probe) 207 { 208 struct slot *slot = hotplug_slot->private; 209 210 return pciehp_reset_slot(slot, probe); 211 } 212 213 static int pciehp_probe(struct pcie_device *dev) 214 { 215 int rc; 216 struct controller *ctrl; 217 struct slot *slot; 218 u8 occupied, poweron; 219 220 /* If this is not a "hotplug" service, we have no business here. */ 221 if (dev->service != PCIE_PORT_SERVICE_HP) 222 return -ENODEV; 223 224 if (!dev->port->subordinate) { 225 /* Can happen if we run out of bus numbers during probe */ 226 dev_err(&dev->device, 227 "Hotplug bridge without secondary bus, ignoring\n"); 228 return -ENODEV; 229 } 230 231 ctrl = pcie_init(dev); 232 if (!ctrl) { 233 dev_err(&dev->device, "Controller initialization failed\n"); 234 return -ENODEV; 235 } 236 set_service_data(dev, ctrl); 237 238 /* Setup the slot information structures */ 239 rc = init_slot(ctrl); 240 if (rc) { 241 if (rc == -EBUSY) 242 ctrl_warn(ctrl, "Slot already registered by another hotplug driver\n"); 243 else 244 ctrl_err(ctrl, "Slot initialization failed (%d)\n", rc); 245 goto err_out_release_ctlr; 246 } 247 248 /* Enable events after we have setup the data structures */ 249 rc = pcie_init_notification(ctrl); 250 if (rc) { 251 ctrl_err(ctrl, "Notification initialization failed (%d)\n", rc); 252 goto err_out_free_ctrl_slot; 253 } 254 255 /* Check if slot is occupied */ 256 slot = ctrl->slot; 257 pciehp_get_adapter_status(slot, &occupied); 258 pciehp_get_power_status(slot, &poweron); 259 if (occupied && pciehp_force) { 260 mutex_lock(&slot->hotplug_lock); 261 pciehp_enable_slot(slot); 262 mutex_unlock(&slot->hotplug_lock); 263 } 264 /* If empty slot's power status is on, turn power off */ 265 if (!occupied && poweron && POWER_CTRL(ctrl)) 266 pciehp_power_off_slot(slot); 267 268 return 0; 269 270 err_out_free_ctrl_slot: 271 cleanup_slot(ctrl); 272 err_out_release_ctlr: 273 pciehp_release_ctrl(ctrl); 274 return -ENODEV; 275 } 276 277 static void pciehp_remove(struct pcie_device *dev) 278 { 279 struct controller *ctrl = get_service_data(dev); 280 281 cleanup_slot(ctrl); 282 pciehp_release_ctrl(ctrl); 283 } 284 285 #ifdef CONFIG_PM 286 static int pciehp_suspend(struct pcie_device *dev) 287 { 288 return 0; 289 } 290 291 static int pciehp_resume(struct pcie_device *dev) 292 { 293 struct controller *ctrl; 294 struct slot *slot; 295 u8 status; 296 297 ctrl = get_service_data(dev); 298 299 /* reinitialize the chipset's event detection logic */ 300 pcie_enable_notification(ctrl); 301 302 slot = ctrl->slot; 303 304 /* Check if slot is occupied */ 305 pciehp_get_adapter_status(slot, &status); 306 mutex_lock(&slot->hotplug_lock); 307 if (status) 308 pciehp_enable_slot(slot); 309 else 310 pciehp_disable_slot(slot); 311 mutex_unlock(&slot->hotplug_lock); 312 return 0; 313 } 314 #endif /* PM */ 315 316 static struct pcie_port_service_driver hpdriver_portdrv = { 317 .name = PCIE_MODULE_NAME, 318 .port_type = PCIE_ANY_PORT, 319 .service = PCIE_PORT_SERVICE_HP, 320 321 .probe = pciehp_probe, 322 .remove = pciehp_remove, 323 324 #ifdef CONFIG_PM 325 .suspend = pciehp_suspend, 326 .resume = pciehp_resume, 327 #endif /* PM */ 328 }; 329 330 static int __init pcied_init(void) 331 { 332 int retval = 0; 333 334 retval = pcie_port_service_register(&hpdriver_portdrv); 335 dbg("pcie_port_service_register = %d\n", retval); 336 if (retval) 337 dbg("Failure to register service\n"); 338 339 return retval; 340 } 341 device_initcall(pcied_init); 342