David Shaohua Li | 4e10d12 | 2005-03-18 18:45:35 -0500 | [diff] [blame] | 1 | /* |
| 2 | * Link physical devices with ACPI devices support |
| 3 | * |
| 4 | * Copyright (c) 2005 David Shaohua Li <shaohua.li@intel.com> |
| 5 | * Copyright (c) 2005 Intel Corp. |
| 6 | * |
| 7 | * This file is released under the GPLv2. |
| 8 | */ |
| 9 | #include <linux/init.h> |
| 10 | #include <linux/list.h> |
| 11 | #include <linux/device.h> |
| 12 | #include <linux/rwsem.h> |
| 13 | #include <linux/acpi.h> |
| 14 | |
| 15 | #define ACPI_GLUE_DEBUG 0 |
| 16 | #if ACPI_GLUE_DEBUG |
| 17 | #define DBG(x...) printk(PREFIX x) |
| 18 | #else |
| 19 | #define DBG(x...) |
| 20 | #endif |
| 21 | static LIST_HEAD(bus_type_list); |
| 22 | static DECLARE_RWSEM(bus_type_sem); |
| 23 | |
| 24 | int register_acpi_bus_type(struct acpi_bus_type *type) |
| 25 | { |
| 26 | if (acpi_disabled) |
| 27 | return -ENODEV; |
| 28 | if (type && type->bus && type->find_device) { |
| 29 | down_write(&bus_type_sem); |
| 30 | list_add_tail(&type->list, &bus_type_list); |
| 31 | up_write(&bus_type_sem); |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 32 | printk(KERN_INFO PREFIX "bus type %s registered\n", |
| 33 | type->bus->name); |
David Shaohua Li | 4e10d12 | 2005-03-18 18:45:35 -0500 | [diff] [blame] | 34 | return 0; |
| 35 | } |
| 36 | return -ENODEV; |
| 37 | } |
| 38 | |
| 39 | EXPORT_SYMBOL(register_acpi_bus_type); |
| 40 | |
| 41 | int unregister_acpi_bus_type(struct acpi_bus_type *type) |
| 42 | { |
| 43 | if (acpi_disabled) |
| 44 | return 0; |
| 45 | if (type) { |
| 46 | down_write(&bus_type_sem); |
| 47 | list_del_init(&type->list); |
| 48 | up_write(&bus_type_sem); |
Len Brown | 4be44fc | 2005-08-05 00:44:28 -0400 | [diff] [blame] | 49 | printk(KERN_INFO PREFIX "ACPI bus type %s unregistered\n", |
| 50 | type->bus->name); |
David Shaohua Li | 4e10d12 | 2005-03-18 18:45:35 -0500 | [diff] [blame] | 51 | return 0; |
| 52 | } |
| 53 | return -ENODEV; |
| 54 | } |
| 55 | |
| 56 | EXPORT_SYMBOL(unregister_acpi_bus_type); |
| 57 | |
| 58 | static struct acpi_bus_type *acpi_get_bus_type(struct bus_type *type) |
| 59 | { |
| 60 | struct acpi_bus_type *tmp, *ret = NULL; |
| 61 | |
| 62 | down_read(&bus_type_sem); |
| 63 | list_for_each_entry(tmp, &bus_type_list, list) { |
| 64 | if (tmp->bus == type) { |
| 65 | ret = tmp; |
| 66 | break; |
| 67 | } |
| 68 | } |
| 69 | up_read(&bus_type_sem); |
| 70 | return ret; |
| 71 | } |
| 72 | |
| 73 | static int acpi_find_bridge_device(struct device *dev, acpi_handle * handle) |
| 74 | { |
| 75 | struct acpi_bus_type *tmp; |
| 76 | int ret = -ENODEV; |
| 77 | |
| 78 | down_read(&bus_type_sem); |
| 79 | list_for_each_entry(tmp, &bus_type_list, list) { |
| 80 | if (tmp->find_bridge && !tmp->find_bridge(dev, handle)) { |
| 81 | ret = 0; |
| 82 | break; |
| 83 | } |
| 84 | } |
| 85 | up_read(&bus_type_sem); |
| 86 | return ret; |
| 87 | } |
| 88 | |
| 89 | /* Get PCI root bridge's handle from its segment and bus number */ |
| 90 | struct acpi_find_pci_root { |
| 91 | unsigned int seg; |
| 92 | unsigned int bus; |
| 93 | acpi_handle handle; |
| 94 | }; |
| 95 | |
| 96 | static acpi_status |
| 97 | do_root_bridge_busnr_callback(struct acpi_resource *resource, void *data) |
| 98 | { |
Peter Chubb | 51b190b | 2005-10-19 22:45:14 -0700 | [diff] [blame] | 99 | unsigned long *busnr = (unsigned long *)data; |
David Shaohua Li | 4e10d12 | 2005-03-18 18:45:35 -0500 | [diff] [blame] | 100 | struct acpi_resource_address64 address; |
| 101 | |
Bob Moore | 50eca3e | 2005-09-30 19:03:00 -0400 | [diff] [blame] | 102 | if (resource->type != ACPI_RESOURCE_TYPE_ADDRESS16 && |
| 103 | resource->type != ACPI_RESOURCE_TYPE_ADDRESS32 && |
| 104 | resource->type != ACPI_RESOURCE_TYPE_ADDRESS64) |
David Shaohua Li | 4e10d12 | 2005-03-18 18:45:35 -0500 | [diff] [blame] | 105 | return AE_OK; |
| 106 | |
| 107 | acpi_resource_to_address64(resource, &address); |
| 108 | if ((address.address_length > 0) && |
| 109 | (address.resource_type == ACPI_BUS_NUMBER_RANGE)) |
Bob Moore | 50eca3e | 2005-09-30 19:03:00 -0400 | [diff] [blame] | 110 | *busnr = address.minimum; |
David Shaohua Li | 4e10d12 | 2005-03-18 18:45:35 -0500 | [diff] [blame] | 111 | |
| 112 | return AE_OK; |
| 113 | } |
| 114 | |
| 115 | static int get_root_bridge_busnr(acpi_handle handle) |
| 116 | { |
| 117 | acpi_status status; |
Peter Chubb | 51b190b | 2005-10-19 22:45:14 -0700 | [diff] [blame] | 118 | unsigned long bus, bbn; |
David Shaohua Li | 4e10d12 | 2005-03-18 18:45:35 -0500 | [diff] [blame] | 119 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
| 120 | |
| 121 | acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); |
| 122 | |
| 123 | status = acpi_evaluate_integer(handle, METHOD_NAME__BBN, NULL, |
Peter Chubb | 51b190b | 2005-10-19 22:45:14 -0700 | [diff] [blame] | 124 | &bbn); |
David Shaohua Li | 4e10d12 | 2005-03-18 18:45:35 -0500 | [diff] [blame] | 125 | if (status == AE_NOT_FOUND) { |
| 126 | /* Assume bus = 0 */ |
| 127 | printk(KERN_INFO PREFIX |
| 128 | "Assume root bridge [%s] bus is 0\n", |
| 129 | (char *)buffer.pointer); |
| 130 | status = AE_OK; |
| 131 | bbn = 0; |
| 132 | } |
| 133 | if (ACPI_FAILURE(status)) { |
| 134 | bbn = -ENODEV; |
| 135 | goto exit; |
| 136 | } |
| 137 | if (bbn > 0) |
| 138 | goto exit; |
| 139 | |
| 140 | /* _BBN in some systems return 0 for all root bridges */ |
| 141 | bus = -1; |
| 142 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, |
| 143 | do_root_bridge_busnr_callback, &bus); |
| 144 | /* If _CRS failed, we just use _BBN */ |
| 145 | if (ACPI_FAILURE(status) || (bus == -1)) |
| 146 | goto exit; |
| 147 | /* We select _CRS */ |
| 148 | if (bbn != bus) { |
| 149 | printk(KERN_INFO PREFIX |
| 150 | "_BBN and _CRS returns different value for %s. Select _CRS\n", |
| 151 | (char *)buffer.pointer); |
| 152 | bbn = bus; |
| 153 | } |
| 154 | exit: |
Len Brown | 02438d8 | 2006-06-30 03:19:10 -0400 | [diff] [blame] | 155 | kfree(buffer.pointer); |
Peter Chubb | 51b190b | 2005-10-19 22:45:14 -0700 | [diff] [blame] | 156 | return (int)bbn; |
David Shaohua Li | 4e10d12 | 2005-03-18 18:45:35 -0500 | [diff] [blame] | 157 | } |
| 158 | |
| 159 | static acpi_status |
| 160 | find_pci_rootbridge(acpi_handle handle, u32 lvl, void *context, void **rv) |
| 161 | { |
| 162 | struct acpi_find_pci_root *find = (struct acpi_find_pci_root *)context; |
| 163 | unsigned long seg, bus; |
| 164 | acpi_status status; |
| 165 | int tmp; |
| 166 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
| 167 | |
| 168 | acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); |
| 169 | |
| 170 | status = acpi_evaluate_integer(handle, METHOD_NAME__SEG, NULL, &seg); |
| 171 | if (status == AE_NOT_FOUND) { |
| 172 | /* Assume seg = 0 */ |
David Shaohua Li | 4e10d12 | 2005-03-18 18:45:35 -0500 | [diff] [blame] | 173 | status = AE_OK; |
| 174 | seg = 0; |
| 175 | } |
| 176 | if (ACPI_FAILURE(status)) { |
| 177 | status = AE_CTRL_DEPTH; |
| 178 | goto exit; |
| 179 | } |
| 180 | |
| 181 | tmp = get_root_bridge_busnr(handle); |
| 182 | if (tmp < 0) { |
| 183 | printk(KERN_ERR PREFIX |
| 184 | "Find root bridge failed for %s\n", |
| 185 | (char *)buffer.pointer); |
| 186 | status = AE_CTRL_DEPTH; |
| 187 | goto exit; |
| 188 | } |
| 189 | bus = tmp; |
| 190 | |
| 191 | if (seg == find->seg && bus == find->bus) |
| 192 | find->handle = handle; |
| 193 | status = AE_OK; |
| 194 | exit: |
Len Brown | 02438d8 | 2006-06-30 03:19:10 -0400 | [diff] [blame] | 195 | kfree(buffer.pointer); |
David Shaohua Li | 4e10d12 | 2005-03-18 18:45:35 -0500 | [diff] [blame] | 196 | return status; |
| 197 | } |
| 198 | |
| 199 | acpi_handle acpi_get_pci_rootbridge_handle(unsigned int seg, unsigned int bus) |
| 200 | { |
| 201 | struct acpi_find_pci_root find = { seg, bus, NULL }; |
| 202 | |
| 203 | acpi_get_devices(PCI_ROOT_HID_STRING, find_pci_rootbridge, &find, NULL); |
| 204 | return find.handle; |
| 205 | } |
rajesh.shah@intel.com | a3a45ec | 2005-10-31 16:20:12 -0800 | [diff] [blame] | 206 | EXPORT_SYMBOL_GPL(acpi_get_pci_rootbridge_handle); |
David Shaohua Li | 4e10d12 | 2005-03-18 18:45:35 -0500 | [diff] [blame] | 207 | |
| 208 | /* Get device's handler per its address under its parent */ |
| 209 | struct acpi_find_child { |
| 210 | acpi_handle handle; |
| 211 | acpi_integer address; |
| 212 | }; |
| 213 | |
| 214 | static acpi_status |
| 215 | do_acpi_find_child(acpi_handle handle, u32 lvl, void *context, void **rv) |
| 216 | { |
| 217 | acpi_status status; |
| 218 | struct acpi_device_info *info; |
| 219 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
| 220 | struct acpi_find_child *find = (struct acpi_find_child *)context; |
| 221 | |
| 222 | status = acpi_get_object_info(handle, &buffer); |
| 223 | if (ACPI_SUCCESS(status)) { |
| 224 | info = buffer.pointer; |
| 225 | if (info->address == find->address) |
| 226 | find->handle = handle; |
Len Brown | 02438d8 | 2006-06-30 03:19:10 -0400 | [diff] [blame] | 227 | kfree(buffer.pointer); |
David Shaohua Li | 4e10d12 | 2005-03-18 18:45:35 -0500 | [diff] [blame] | 228 | } |
| 229 | return AE_OK; |
| 230 | } |
| 231 | |
| 232 | acpi_handle acpi_get_child(acpi_handle parent, acpi_integer address) |
| 233 | { |
| 234 | struct acpi_find_child find = { NULL, address }; |
| 235 | |
| 236 | if (!parent) |
| 237 | return NULL; |
| 238 | acpi_walk_namespace(ACPI_TYPE_DEVICE, parent, |
| 239 | 1, do_acpi_find_child, &find, NULL); |
| 240 | return find.handle; |
| 241 | } |
| 242 | |
| 243 | EXPORT_SYMBOL(acpi_get_child); |
| 244 | |
| 245 | /* Link ACPI devices with physical devices */ |
| 246 | static void acpi_glue_data_handler(acpi_handle handle, |
| 247 | u32 function, void *context) |
| 248 | { |
| 249 | /* we provide an empty handler */ |
| 250 | } |
| 251 | |
| 252 | /* Note: a success call will increase reference count by one */ |
| 253 | struct device *acpi_get_physical_device(acpi_handle handle) |
| 254 | { |
| 255 | acpi_status status; |
| 256 | struct device *dev; |
| 257 | |
| 258 | status = acpi_get_data(handle, acpi_glue_data_handler, (void **)&dev); |
| 259 | if (ACPI_SUCCESS(status)) |
| 260 | return get_device(dev); |
| 261 | return NULL; |
| 262 | } |
| 263 | |
| 264 | EXPORT_SYMBOL(acpi_get_physical_device); |
| 265 | |
| 266 | static int acpi_bind_one(struct device *dev, acpi_handle handle) |
| 267 | { |
| 268 | acpi_status status; |
| 269 | |
Benjamin Herrenschmidt | 465ae64 | 2006-11-11 17:18:42 +1100 | [diff] [blame] | 270 | if (dev->archdata.acpi_handle) { |
David Shaohua Li | 4e10d12 | 2005-03-18 18:45:35 -0500 | [diff] [blame] | 271 | printk(KERN_WARNING PREFIX |
Benjamin Herrenschmidt | 465ae64 | 2006-11-11 17:18:42 +1100 | [diff] [blame] | 272 | "Drivers changed 'acpi_handle' for %s\n", dev->bus_id); |
David Shaohua Li | 4e10d12 | 2005-03-18 18:45:35 -0500 | [diff] [blame] | 273 | return -EINVAL; |
| 274 | } |
| 275 | get_device(dev); |
| 276 | status = acpi_attach_data(handle, acpi_glue_data_handler, dev); |
| 277 | if (ACPI_FAILURE(status)) { |
| 278 | put_device(dev); |
| 279 | return -EINVAL; |
| 280 | } |
Benjamin Herrenschmidt | 465ae64 | 2006-11-11 17:18:42 +1100 | [diff] [blame] | 281 | dev->archdata.acpi_handle = handle; |
David Shaohua Li | 4e10d12 | 2005-03-18 18:45:35 -0500 | [diff] [blame] | 282 | |
| 283 | return 0; |
| 284 | } |
| 285 | |
| 286 | static int acpi_unbind_one(struct device *dev) |
| 287 | { |
Benjamin Herrenschmidt | 465ae64 | 2006-11-11 17:18:42 +1100 | [diff] [blame] | 288 | if (!dev->archdata.acpi_handle) |
David Shaohua Li | 4e10d12 | 2005-03-18 18:45:35 -0500 | [diff] [blame] | 289 | return 0; |
Benjamin Herrenschmidt | 465ae64 | 2006-11-11 17:18:42 +1100 | [diff] [blame] | 290 | if (dev == acpi_get_physical_device(dev->archdata.acpi_handle)) { |
David Shaohua Li | 4e10d12 | 2005-03-18 18:45:35 -0500 | [diff] [blame] | 291 | /* acpi_get_physical_device increase refcnt by one */ |
| 292 | put_device(dev); |
Benjamin Herrenschmidt | 465ae64 | 2006-11-11 17:18:42 +1100 | [diff] [blame] | 293 | acpi_detach_data(dev->archdata.acpi_handle, |
| 294 | acpi_glue_data_handler); |
| 295 | dev->archdata.acpi_handle = NULL; |
David Shaohua Li | 4e10d12 | 2005-03-18 18:45:35 -0500 | [diff] [blame] | 296 | /* acpi_bind_one increase refcnt by one */ |
| 297 | put_device(dev); |
| 298 | } else { |
| 299 | printk(KERN_ERR PREFIX |
Benjamin Herrenschmidt | 465ae64 | 2006-11-11 17:18:42 +1100 | [diff] [blame] | 300 | "Oops, 'acpi_handle' corrupt for %s\n", dev->bus_id); |
David Shaohua Li | 4e10d12 | 2005-03-18 18:45:35 -0500 | [diff] [blame] | 301 | } |
| 302 | return 0; |
| 303 | } |
| 304 | |
| 305 | static int acpi_platform_notify(struct device *dev) |
| 306 | { |
| 307 | struct acpi_bus_type *type; |
| 308 | acpi_handle handle; |
| 309 | int ret = -EINVAL; |
| 310 | |
| 311 | if (!dev->bus || !dev->parent) { |
| 312 | /* bridge devices genernally haven't bus or parent */ |
| 313 | ret = acpi_find_bridge_device(dev, &handle); |
| 314 | goto end; |
| 315 | } |
| 316 | type = acpi_get_bus_type(dev->bus); |
| 317 | if (!type) { |
David Shaohua Li | ef7b06c | 2005-04-18 22:59:23 -0400 | [diff] [blame] | 318 | DBG("No ACPI bus support for %s\n", dev->bus_id); |
David Shaohua Li | 4e10d12 | 2005-03-18 18:45:35 -0500 | [diff] [blame] | 319 | ret = -EINVAL; |
| 320 | goto end; |
| 321 | } |
| 322 | if ((ret = type->find_device(dev, &handle)) != 0) |
David Shaohua Li | ef7b06c | 2005-04-18 22:59:23 -0400 | [diff] [blame] | 323 | DBG("Can't get handler for %s\n", dev->bus_id); |
David Shaohua Li | 4e10d12 | 2005-03-18 18:45:35 -0500 | [diff] [blame] | 324 | end: |
| 325 | if (!ret) |
| 326 | acpi_bind_one(dev, handle); |
| 327 | |
| 328 | #if ACPI_GLUE_DEBUG |
| 329 | if (!ret) { |
| 330 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
| 331 | |
Benjamin Herrenschmidt | 465ae64 | 2006-11-11 17:18:42 +1100 | [diff] [blame] | 332 | acpi_get_name(dev->archdata.acpi_handle, |
| 333 | ACPI_FULL_PATHNAME, &buffer); |
David Shaohua Li | 4e10d12 | 2005-03-18 18:45:35 -0500 | [diff] [blame] | 334 | DBG("Device %s -> %s\n", dev->bus_id, (char *)buffer.pointer); |
Len Brown | 02438d8 | 2006-06-30 03:19:10 -0400 | [diff] [blame] | 335 | kfree(buffer.pointer); |
David Shaohua Li | 4e10d12 | 2005-03-18 18:45:35 -0500 | [diff] [blame] | 336 | } else |
| 337 | DBG("Device %s -> No ACPI support\n", dev->bus_id); |
| 338 | #endif |
| 339 | |
| 340 | return ret; |
| 341 | } |
| 342 | |
| 343 | static int acpi_platform_notify_remove(struct device *dev) |
| 344 | { |
| 345 | acpi_unbind_one(dev); |
| 346 | return 0; |
| 347 | } |
| 348 | |
| 349 | static int __init init_acpi_device_notify(void) |
| 350 | { |
| 351 | if (acpi_disabled) |
| 352 | return 0; |
| 353 | if (platform_notify || platform_notify_remove) { |
| 354 | printk(KERN_ERR PREFIX "Can't use platform_notify\n"); |
| 355 | return 0; |
| 356 | } |
| 357 | platform_notify = acpi_platform_notify; |
| 358 | platform_notify_remove = acpi_platform_notify_remove; |
| 359 | return 0; |
| 360 | } |
| 361 | |
| 362 | arch_initcall(init_acpi_device_notify); |