1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Standard Hot Plug Controller Driver 4 * 5 * Copyright (C) 1995,2001 Compaq Computer Corporation 6 * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com) 7 * Copyright (C) 2001 IBM Corp. 8 * Copyright (C) 2003-2004 Intel Corporation 9 * 10 * All rights reserved. 11 * 12 * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com> 13 * 14 */ 15 16 #include <linux/module.h> 17 #include <linux/moduleparam.h> 18 #include <linux/kernel.h> 19 #include <linux/types.h> 20 #include <linux/slab.h> 21 #include <linux/pci.h> 22 #include "shpchp.h" 23 24 /* Global variables */ 25 bool shpchp_poll_mode; 26 int shpchp_poll_time; 27 28 #define DRIVER_VERSION "0.4" 29 #define DRIVER_AUTHOR "Dan Zink <dan.zink@compaq.com>, Greg Kroah-Hartman <greg@kroah.com>, Dely Sy <dely.l.sy@intel.com>" 30 #define DRIVER_DESC "Standard Hot Plug PCI Controller Driver" 31 32 MODULE_AUTHOR(DRIVER_AUTHOR); 33 MODULE_DESCRIPTION(DRIVER_DESC); 34 35 module_param(shpchp_poll_mode, bool, 0644); 36 module_param(shpchp_poll_time, int, 0644); 37 MODULE_PARM_DESC(shpchp_poll_mode, "Using polling mechanism for hot-plug events or not"); 38 MODULE_PARM_DESC(shpchp_poll_time, "Polling mechanism frequency, in seconds"); 39 40 #define SHPC_MODULE_NAME "shpchp" 41 42 static int set_attention_status(struct hotplug_slot *slot, u8 value); 43 static int enable_slot(struct hotplug_slot *slot); 44 static int disable_slot(struct hotplug_slot *slot); 45 static int get_power_status(struct hotplug_slot *slot, u8 *value); 46 static int get_attention_status(struct hotplug_slot *slot, u8 *value); 47 static int get_latch_status(struct hotplug_slot *slot, u8 *value); 48 static int get_adapter_status(struct hotplug_slot *slot, u8 *value); 49 50 static const struct hotplug_slot_ops shpchp_hotplug_slot_ops = { 51 .set_attention_status = set_attention_status, 52 .enable_slot = enable_slot, 53 .disable_slot = disable_slot, 54 .get_power_status = get_power_status, 55 .get_attention_status = get_attention_status, 56 .get_latch_status = get_latch_status, 57 .get_adapter_status = get_adapter_status, 58 }; 59 60 static int init_slots(struct controller *ctrl) 61 { 62 struct slot *slot; 63 struct hotplug_slot *hotplug_slot; 64 char name[SLOT_NAME_SIZE]; 65 int retval; 66 int i; 67 68 for (i = 0; i < ctrl->num_slots; i++) { 69 slot = kzalloc(sizeof(*slot), GFP_KERNEL); 70 if (!slot) { 71 retval = -ENOMEM; 72 goto error; 73 } 74 75 hotplug_slot = &slot->hotplug_slot; 76 77 slot->hp_slot = i; 78 slot->ctrl = ctrl; 79 slot->bus = ctrl->pci_dev->subordinate->number; 80 slot->device = ctrl->slot_device_offset + i; 81 slot->number = ctrl->first_slot + (ctrl->slot_num_inc * i); 82 83 slot->wq = alloc_workqueue("shpchp-%d", 0, 0, slot->number); 84 if (!slot->wq) { 85 retval = -ENOMEM; 86 goto error_slot; 87 } 88 89 mutex_init(&slot->lock); 90 INIT_DELAYED_WORK(&slot->work, shpchp_queue_pushbutton_work); 91 92 /* register this slot with the hotplug pci core */ 93 snprintf(name, SLOT_NAME_SIZE, "%d", slot->number); 94 hotplug_slot->ops = &shpchp_hotplug_slot_ops; 95 96 ctrl_dbg(ctrl, "Registering domain:bus:dev=%04x:%02x:%02x hp_slot=%x sun=%x slot_device_offset=%x\n", 97 pci_domain_nr(ctrl->pci_dev->subordinate), 98 slot->bus, slot->device, slot->hp_slot, slot->number, 99 ctrl->slot_device_offset); 100 retval = pci_hp_register(hotplug_slot, 101 ctrl->pci_dev->subordinate, slot->device, name); 102 if (retval) { 103 ctrl_err(ctrl, "pci_hp_register failed with error %d\n", 104 retval); 105 goto error_slotwq; 106 } 107 108 get_power_status(hotplug_slot, &slot->pwr_save); 109 get_attention_status(hotplug_slot, &slot->attention_save); 110 get_latch_status(hotplug_slot, &slot->latch_save); 111 get_adapter_status(hotplug_slot, &slot->presence_save); 112 113 list_add(&slot->slot_list, &ctrl->slot_list); 114 } 115 116 return 0; 117 error_slotwq: 118 destroy_workqueue(slot->wq); 119 error_slot: 120 kfree(slot); 121 error: 122 return retval; 123 } 124 125 void cleanup_slots(struct controller *ctrl) 126 { 127 struct slot *slot, *next; 128 129 list_for_each_entry_safe(slot, next, &ctrl->slot_list, slot_list) { 130 list_del(&slot->slot_list); 131 cancel_delayed_work(&slot->work); 132 destroy_workqueue(slot->wq); 133 pci_hp_deregister(&slot->hotplug_slot); 134 kfree(slot); 135 } 136 } 137 138 /* 139 * set_attention_status - Turns the Amber LED for a slot on, off or blink 140 */ 141 static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status) 142 { 143 struct slot *slot = get_slot(hotplug_slot); 144 145 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", 146 __func__, slot_name(slot)); 147 148 slot->attention_save = status; 149 shpchp_set_attention_status(slot, status); 150 151 return 0; 152 } 153 154 static int enable_slot(struct hotplug_slot *hotplug_slot) 155 { 156 struct slot *slot = get_slot(hotplug_slot); 157 158 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", 159 __func__, slot_name(slot)); 160 161 return shpchp_sysfs_enable_slot(slot); 162 } 163 164 static int disable_slot(struct hotplug_slot *hotplug_slot) 165 { 166 struct slot *slot = get_slot(hotplug_slot); 167 168 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", 169 __func__, slot_name(slot)); 170 171 return shpchp_sysfs_disable_slot(slot); 172 } 173 174 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value) 175 { 176 struct slot *slot = get_slot(hotplug_slot); 177 int retval; 178 179 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", 180 __func__, slot_name(slot)); 181 182 retval = shpchp_get_power_status(slot, value); 183 if (retval < 0) 184 *value = slot->pwr_save; 185 186 return 0; 187 } 188 189 static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value) 190 { 191 struct slot *slot = get_slot(hotplug_slot); 192 int retval; 193 194 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", 195 __func__, slot_name(slot)); 196 197 retval = shpchp_get_attention_status(slot, value); 198 if (retval < 0) 199 *value = slot->attention_save; 200 201 return 0; 202 } 203 204 static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value) 205 { 206 struct slot *slot = get_slot(hotplug_slot); 207 int retval; 208 209 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", 210 __func__, slot_name(slot)); 211 212 retval = shpchp_get_latch_status(slot, value); 213 if (retval < 0) 214 *value = slot->latch_save; 215 216 return 0; 217 } 218 219 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value) 220 { 221 struct slot *slot = get_slot(hotplug_slot); 222 int retval; 223 224 ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n", 225 __func__, slot_name(slot)); 226 227 retval = shpchp_get_adapter_status(slot, value); 228 if (retval < 0) 229 *value = slot->presence_save; 230 231 return 0; 232 } 233 234 static bool shpc_capable(struct pci_dev *bridge) 235 { 236 /* 237 * It is assumed that AMD GOLAM chips support SHPC but they do not 238 * have SHPC capability. 239 */ 240 if (bridge->vendor == PCI_VENDOR_ID_AMD && 241 bridge->device == PCI_DEVICE_ID_AMD_GOLAM_7450) 242 return true; 243 244 if (pci_find_capability(bridge, PCI_CAP_ID_SHPC)) 245 return true; 246 247 return false; 248 } 249 250 static int shpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent) 251 { 252 int rc; 253 struct controller *ctrl; 254 255 if (!shpc_capable(pdev)) 256 return -ENODEV; 257 258 if (acpi_get_hp_hw_control_from_firmware(pdev)) 259 return -ENODEV; 260 261 ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL); 262 if (!ctrl) 263 goto err_out_none; 264 265 INIT_LIST_HEAD(&ctrl->slot_list); 266 267 rc = shpc_init(ctrl, pdev); 268 if (rc) { 269 ctrl_dbg(ctrl, "Controller initialization failed\n"); 270 goto err_out_free_ctrl; 271 } 272 273 pci_set_drvdata(pdev, ctrl); 274 275 /* Setup the slot information structures */ 276 rc = init_slots(ctrl); 277 if (rc) { 278 ctrl_err(ctrl, "Slot initialization failed\n"); 279 goto err_out_release_ctlr; 280 } 281 282 rc = shpchp_create_ctrl_files(ctrl); 283 if (rc) 284 goto err_cleanup_slots; 285 286 pdev->shpc_managed = 1; 287 return 0; 288 289 err_cleanup_slots: 290 cleanup_slots(ctrl); 291 err_out_release_ctlr: 292 shpchp_release_ctlr(ctrl); 293 err_out_free_ctrl: 294 kfree(ctrl); 295 err_out_none: 296 return -ENODEV; 297 } 298 299 static void shpc_remove(struct pci_dev *dev) 300 { 301 struct controller *ctrl = pci_get_drvdata(dev); 302 303 dev->shpc_managed = 0; 304 shpchp_remove_ctrl_files(ctrl); 305 shpchp_release_ctlr(ctrl); 306 kfree(ctrl); 307 } 308 309 static const struct pci_device_id shpcd_pci_tbl[] = { 310 {PCI_DEVICE_CLASS(PCI_CLASS_BRIDGE_PCI_NORMAL, ~0)}, 311 { /* end: all zeroes */ } 312 }; 313 MODULE_DEVICE_TABLE(pci, shpcd_pci_tbl); 314 315 static struct pci_driver shpc_driver = { 316 .name = SHPC_MODULE_NAME, 317 .id_table = shpcd_pci_tbl, 318 .probe = shpc_probe, 319 .remove = shpc_remove, 320 }; 321 322 static int __init shpcd_init(void) 323 { 324 return pci_register_driver(&shpc_driver); 325 } 326 327 static void __exit shpcd_cleanup(void) 328 { 329 pci_unregister_driver(&shpc_driver); 330 } 331 332 module_init(shpcd_init); 333 module_exit(shpcd_cleanup); 334