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