1 /* 2 * File: pci-acpi.c 3 * Purpose: Provide PCI support in ACPI 4 * 5 * Copyright (C) 2005 David Shaohua Li <shaohua.li@intel.com> 6 * Copyright (C) 2004 Tom Long Nguyen <tom.l.nguyen@intel.com> 7 * Copyright (C) 2004 Intel Corp. 8 */ 9 10 #include <linux/delay.h> 11 #include <linux/init.h> 12 #include <linux/pci.h> 13 #include <linux/module.h> 14 #include <linux/pci-aspm.h> 15 #include <acpi/acpi.h> 16 #include <acpi/acnamesp.h> 17 #include <acpi/acresrc.h> 18 #include <acpi/acpi_bus.h> 19 20 #include <linux/pci-acpi.h> 21 #include "pci.h" 22 23 struct acpi_osc_data { 24 acpi_handle handle; 25 u32 support_set; 26 u32 control_set; 27 int is_queried; 28 u32 query_result; 29 struct list_head sibiling; 30 }; 31 static LIST_HEAD(acpi_osc_data_list); 32 33 struct acpi_osc_args { 34 u32 capbuf[3]; 35 u32 query_result; 36 }; 37 38 static struct acpi_osc_data *acpi_get_osc_data(acpi_handle handle) 39 { 40 struct acpi_osc_data *data; 41 42 list_for_each_entry(data, &acpi_osc_data_list, sibiling) { 43 if (data->handle == handle) 44 return data; 45 } 46 data = kzalloc(sizeof(*data), GFP_KERNEL); 47 if (!data) 48 return NULL; 49 INIT_LIST_HEAD(&data->sibiling); 50 data->handle = handle; 51 list_add_tail(&data->sibiling, &acpi_osc_data_list); 52 return data; 53 } 54 55 static u8 OSC_UUID[16] = {0x5B, 0x4D, 0xDB, 0x33, 0xF7, 0x1F, 0x1C, 0x40, 56 0x96, 0x57, 0x74, 0x41, 0xC0, 0x3D, 0xD7, 0x66}; 57 58 static acpi_status acpi_run_osc(acpi_handle handle, 59 struct acpi_osc_args *osc_args) 60 { 61 acpi_status status; 62 struct acpi_object_list input; 63 union acpi_object in_params[4]; 64 struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL}; 65 union acpi_object *out_obj; 66 u32 osc_dw0, flags = osc_args->capbuf[OSC_QUERY_TYPE]; 67 68 /* Setting up input parameters */ 69 input.count = 4; 70 input.pointer = in_params; 71 in_params[0].type = ACPI_TYPE_BUFFER; 72 in_params[0].buffer.length = 16; 73 in_params[0].buffer.pointer = OSC_UUID; 74 in_params[1].type = ACPI_TYPE_INTEGER; 75 in_params[1].integer.value = 1; 76 in_params[2].type = ACPI_TYPE_INTEGER; 77 in_params[2].integer.value = 3; 78 in_params[3].type = ACPI_TYPE_BUFFER; 79 in_params[3].buffer.length = 12; 80 in_params[3].buffer.pointer = (u8 *)osc_args->capbuf; 81 82 status = acpi_evaluate_object(handle, "_OSC", &input, &output); 83 if (ACPI_FAILURE(status)) 84 return status; 85 86 out_obj = output.pointer; 87 if (out_obj->type != ACPI_TYPE_BUFFER) { 88 printk(KERN_DEBUG "Evaluate _OSC returns wrong type\n"); 89 status = AE_TYPE; 90 goto out_kfree; 91 } 92 osc_dw0 = *((u32 *)out_obj->buffer.pointer); 93 if (osc_dw0) { 94 if (osc_dw0 & OSC_REQUEST_ERROR) 95 printk(KERN_DEBUG "_OSC request fails\n"); 96 if (osc_dw0 & OSC_INVALID_UUID_ERROR) 97 printk(KERN_DEBUG "_OSC invalid UUID\n"); 98 if (osc_dw0 & OSC_INVALID_REVISION_ERROR) 99 printk(KERN_DEBUG "_OSC invalid revision\n"); 100 if (osc_dw0 & OSC_CAPABILITIES_MASK_ERROR) { 101 if (flags & OSC_QUERY_ENABLE) 102 goto out_success; 103 printk(KERN_DEBUG "_OSC FW not grant req. control\n"); 104 status = AE_SUPPORT; 105 goto out_kfree; 106 } 107 status = AE_ERROR; 108 goto out_kfree; 109 } 110 out_success: 111 if (flags & OSC_QUERY_ENABLE) 112 osc_args->query_result = 113 *((u32 *)(out_obj->buffer.pointer + 8)); 114 status = AE_OK; 115 116 out_kfree: 117 kfree(output.pointer); 118 return status; 119 } 120 121 static acpi_status acpi_query_osc(acpi_handle handle, 122 u32 level, void *context, void **retval) 123 { 124 acpi_status status; 125 struct acpi_osc_data *osc_data; 126 u32 flags = (unsigned long)context, support_set; 127 acpi_handle tmp; 128 struct acpi_osc_args osc_args; 129 130 status = acpi_get_handle(handle, "_OSC", &tmp); 131 if (ACPI_FAILURE(status)) 132 return status; 133 134 osc_data = acpi_get_osc_data(handle); 135 if (!osc_data) { 136 printk(KERN_ERR "acpi osc data array is full\n"); 137 return AE_ERROR; 138 } 139 140 /* do _OSC query for all possible controls */ 141 support_set = osc_data->support_set | (flags & OSC_SUPPORT_MASKS); 142 osc_args.capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE; 143 osc_args.capbuf[OSC_SUPPORT_TYPE] = support_set; 144 osc_args.capbuf[OSC_CONTROL_TYPE] = OSC_CONTROL_MASKS; 145 146 status = acpi_run_osc(handle, &osc_args); 147 if (ACPI_SUCCESS(status)) { 148 osc_data->support_set = support_set; 149 osc_data->query_result = osc_args.query_result; 150 osc_data->is_queried = 1; 151 } 152 153 return status; 154 } 155 156 /** 157 * __pci_osc_support_set - register OS support to Firmware 158 * @flags: OS support bits 159 * @hid: hardware ID 160 * 161 * Update OS support fields and doing a _OSC Query to obtain an update 162 * from Firmware on supported control bits. 163 **/ 164 acpi_status __pci_osc_support_set(u32 flags, const char *hid) 165 { 166 if (!(flags & OSC_SUPPORT_MASKS)) 167 return AE_TYPE; 168 169 acpi_get_devices(hid, acpi_query_osc, 170 (void *)(unsigned long)flags, NULL); 171 return AE_OK; 172 } 173 174 /** 175 * pci_osc_control_set - commit requested control to Firmware 176 * @handle: acpi_handle for the target ACPI object 177 * @flags: driver's requested control bits 178 * 179 * Attempt to take control from Firmware on requested control bits. 180 **/ 181 acpi_status pci_osc_control_set(acpi_handle handle, u32 flags) 182 { 183 acpi_status status; 184 u32 ctrlset, control_set; 185 acpi_handle tmp; 186 struct acpi_osc_data *osc_data; 187 struct acpi_osc_args osc_args; 188 189 status = acpi_get_handle(handle, "_OSC", &tmp); 190 if (ACPI_FAILURE(status)) 191 return status; 192 193 osc_data = acpi_get_osc_data(handle); 194 if (!osc_data) { 195 printk(KERN_ERR "acpi osc data array is full\n"); 196 return AE_ERROR; 197 } 198 199 ctrlset = (flags & OSC_CONTROL_MASKS); 200 if (!ctrlset) 201 return AE_TYPE; 202 203 if (osc_data->is_queried && 204 ((osc_data->query_result & ctrlset) != ctrlset)) 205 return AE_SUPPORT; 206 207 control_set = osc_data->control_set | ctrlset; 208 osc_args.capbuf[OSC_QUERY_TYPE] = 0; 209 osc_args.capbuf[OSC_SUPPORT_TYPE] = osc_data->support_set; 210 osc_args.capbuf[OSC_CONTROL_TYPE] = control_set; 211 status = acpi_run_osc(handle, &osc_args); 212 if (ACPI_SUCCESS(status)) 213 osc_data->control_set = control_set; 214 215 return status; 216 } 217 EXPORT_SYMBOL(pci_osc_control_set); 218 219 /* 220 * _SxD returns the D-state with the highest power 221 * (lowest D-state number) supported in the S-state "x". 222 * 223 * If the devices does not have a _PRW 224 * (Power Resources for Wake) supporting system wakeup from "x" 225 * then the OS is free to choose a lower power (higher number 226 * D-state) than the return value from _SxD. 227 * 228 * But if _PRW is enabled at S-state "x", the OS 229 * must not choose a power lower than _SxD -- 230 * unless the device has an _SxW method specifying 231 * the lowest power (highest D-state number) the device 232 * may enter while still able to wake the system. 233 * 234 * ie. depending on global OS policy: 235 * 236 * if (_PRW at S-state x) 237 * choose from highest power _SxD to lowest power _SxW 238 * else // no _PRW at S-state x 239 * choose highest power _SxD or any lower power 240 */ 241 242 static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev) 243 { 244 int acpi_state; 245 246 acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL); 247 if (acpi_state < 0) 248 return PCI_POWER_ERROR; 249 250 switch (acpi_state) { 251 case ACPI_STATE_D0: 252 return PCI_D0; 253 case ACPI_STATE_D1: 254 return PCI_D1; 255 case ACPI_STATE_D2: 256 return PCI_D2; 257 case ACPI_STATE_D3: 258 return PCI_D3hot; 259 } 260 return PCI_POWER_ERROR; 261 } 262 263 static bool acpi_pci_power_manageable(struct pci_dev *dev) 264 { 265 acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev); 266 267 return handle ? acpi_bus_power_manageable(handle) : false; 268 } 269 270 static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state) 271 { 272 acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev); 273 acpi_handle tmp; 274 static const u8 state_conv[] = { 275 [PCI_D0] = ACPI_STATE_D0, 276 [PCI_D1] = ACPI_STATE_D1, 277 [PCI_D2] = ACPI_STATE_D2, 278 [PCI_D3hot] = ACPI_STATE_D3, 279 [PCI_D3cold] = ACPI_STATE_D3 280 }; 281 int error = -EINVAL; 282 283 /* If the ACPI device has _EJ0, ignore the device */ 284 if (!handle || ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp))) 285 return -ENODEV; 286 287 switch (state) { 288 case PCI_D0: 289 case PCI_D1: 290 case PCI_D2: 291 case PCI_D3hot: 292 case PCI_D3cold: 293 error = acpi_bus_set_power(handle, state_conv[state]); 294 } 295 296 if (!error) 297 dev_printk(KERN_INFO, &dev->dev, 298 "power state changed by ACPI to D%d\n", state); 299 300 return error; 301 } 302 303 static bool acpi_pci_can_wakeup(struct pci_dev *dev) 304 { 305 acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev); 306 307 return handle ? acpi_bus_can_wakeup(handle) : false; 308 } 309 310 static int acpi_pci_sleep_wake(struct pci_dev *dev, bool enable) 311 { 312 int error = acpi_pm_device_sleep_wake(&dev->dev, enable); 313 314 if (!error) 315 dev_printk(KERN_INFO, &dev->dev, 316 "wake-up capability %s by ACPI\n", 317 enable ? "enabled" : "disabled"); 318 return error; 319 } 320 321 static struct pci_platform_pm_ops acpi_pci_platform_pm = { 322 .is_manageable = acpi_pci_power_manageable, 323 .set_state = acpi_pci_set_power_state, 324 .choose_state = acpi_pci_choose_state, 325 .can_wakeup = acpi_pci_can_wakeup, 326 .sleep_wake = acpi_pci_sleep_wake, 327 }; 328 329 /* ACPI bus type */ 330 static int acpi_pci_find_device(struct device *dev, acpi_handle *handle) 331 { 332 struct pci_dev * pci_dev; 333 acpi_integer addr; 334 335 pci_dev = to_pci_dev(dev); 336 /* Please ref to ACPI spec for the syntax of _ADR */ 337 addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn); 338 *handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr); 339 if (!*handle) 340 return -ENODEV; 341 return 0; 342 } 343 344 static int acpi_pci_find_root_bridge(struct device *dev, acpi_handle *handle) 345 { 346 int num; 347 unsigned int seg, bus; 348 349 /* 350 * The string should be the same as root bridge's name 351 * Please look at 'pci_scan_bus_parented' 352 */ 353 num = sscanf(dev->bus_id, "pci%04x:%02x", &seg, &bus); 354 if (num != 2) 355 return -ENODEV; 356 *handle = acpi_get_pci_rootbridge_handle(seg, bus); 357 if (!*handle) 358 return -ENODEV; 359 return 0; 360 } 361 362 static struct acpi_bus_type acpi_pci_bus = { 363 .bus = &pci_bus_type, 364 .find_device = acpi_pci_find_device, 365 .find_bridge = acpi_pci_find_root_bridge, 366 }; 367 368 static int __init acpi_pci_init(void) 369 { 370 int ret; 371 372 if (acpi_gbl_FADT.boot_flags & BAF_MSI_NOT_SUPPORTED) { 373 printk(KERN_INFO"ACPI FADT declares the system doesn't support MSI, so disable it\n"); 374 pci_no_msi(); 375 } 376 377 if (acpi_gbl_FADT.boot_flags & BAF_PCIE_ASPM_CONTROL) { 378 printk(KERN_INFO"ACPI FADT declares the system doesn't support PCIe ASPM, so disable it\n"); 379 pcie_no_aspm(); 380 } 381 382 ret = register_acpi_bus_type(&acpi_pci_bus); 383 if (ret) 384 return 0; 385 pci_set_platform_pm(&acpi_pci_platform_pm); 386 return 0; 387 } 388 arch_initcall(acpi_pci_init); 389