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 40 41 /* Setting up input parameters */ 42 input.count = 4; 43 input.pointer = in_params; 44 in_params[0].type = ACPI_TYPE_BUFFER; 45 in_params[0].buffer.length = 16; 46 in_params[0].buffer.pointer = OSC_UUID; 47 in_params[1].type = ACPI_TYPE_INTEGER; 48 in_params[1].integer.value = 1; 49 in_params[2].type = ACPI_TYPE_INTEGER; 50 in_params[2].integer.value = 3; 51 in_params[3].type = ACPI_TYPE_BUFFER; 52 in_params[3].buffer.length = 12; 53 in_params[3].buffer.pointer = (u8 *)context; 54 55 status = acpi_evaluate_object(handle, "_OSC", &input, &output); 56 if (ACPI_FAILURE (status)) { 57 printk(KERN_DEBUG 58 "Evaluate _OSC Set fails. Status = 0x%04x\n", 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 return status; 94 } 95 96 97 static acpi_status 98 acpi_run_osc ( 99 acpi_handle handle, 100 void *context) 101 { 102 acpi_status status; 103 struct acpi_object_list input; 104 union acpi_object in_params[4]; 105 struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL}; 106 union acpi_object *out_obj; 107 u32 osc_dw0; 108 109 /* Setting up input parameters */ 110 input.count = 4; 111 input.pointer = in_params; 112 in_params[0].type = ACPI_TYPE_BUFFER; 113 in_params[0].buffer.length = 16; 114 in_params[0].buffer.pointer = OSC_UUID; 115 in_params[1].type = ACPI_TYPE_INTEGER; 116 in_params[1].integer.value = 1; 117 in_params[2].type = ACPI_TYPE_INTEGER; 118 in_params[2].integer.value = 3; 119 in_params[3].type = ACPI_TYPE_BUFFER; 120 in_params[3].buffer.length = 12; 121 in_params[3].buffer.pointer = (u8 *)context; 122 123 status = acpi_evaluate_object(handle, "_OSC", &input, &output); 124 if (ACPI_FAILURE (status)) { 125 printk(KERN_DEBUG 126 "Evaluate _OSC Set fails. Status = 0x%04x\n", status); 127 return status; 128 } 129 out_obj = output.pointer; 130 if (out_obj->type != ACPI_TYPE_BUFFER) { 131 printk(KERN_DEBUG 132 "Evaluate _OSC returns wrong type\n"); 133 status = AE_TYPE; 134 goto run_osc_out; 135 } 136 osc_dw0 = *((u32 *) out_obj->buffer.pointer); 137 if (osc_dw0) { 138 if (osc_dw0 & OSC_REQUEST_ERROR) 139 printk(KERN_DEBUG "_OSC request fails\n"); 140 if (osc_dw0 & OSC_INVALID_UUID_ERROR) 141 printk(KERN_DEBUG "_OSC invalid UUID\n"); 142 if (osc_dw0 & OSC_INVALID_REVISION_ERROR) 143 printk(KERN_DEBUG "_OSC invalid revision\n"); 144 if (osc_dw0 & OSC_CAPABILITIES_MASK_ERROR) { 145 printk(KERN_DEBUG "_OSC FW not grant req. control\n"); 146 status = AE_SUPPORT; 147 goto run_osc_out; 148 } 149 status = AE_ERROR; 150 goto run_osc_out; 151 } 152 status = AE_OK; 153 154 run_osc_out: 155 kfree(output.pointer); 156 return status; 157 } 158 159 /** 160 * pci_osc_support_set - register OS support to Firmware 161 * @flags: OS support bits 162 * 163 * Update OS support fields and doing a _OSC Query to obtain an update 164 * from Firmware on supported control bits. 165 **/ 166 acpi_status pci_osc_support_set(u32 flags) 167 { 168 u32 temp; 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 NULL ); 183 ctrlset_buf[OSC_QUERY_TYPE] = !OSC_QUERY_ENABLE; 184 ctrlset_buf[OSC_CONTROL_TYPE] = temp; 185 return AE_OK; 186 } 187 EXPORT_SYMBOL(pci_osc_support_set); 188 189 /** 190 * pci_osc_control_set - commit requested control to Firmware 191 * @handle: acpi_handle for the target ACPI object 192 * @flags: driver's requested control bits 193 * 194 * Attempt to take control from Firmware on requested control bits. 195 **/ 196 acpi_status pci_osc_control_set(acpi_handle handle, u32 flags) 197 { 198 acpi_status status; 199 u32 ctrlset; 200 201 ctrlset = (flags & OSC_CONTROL_MASKS); 202 if (!ctrlset) { 203 return AE_TYPE; 204 } 205 if (ctrlset_buf[OSC_SUPPORT_TYPE] && 206 ((global_ctrlsets & ctrlset) != ctrlset)) { 207 return AE_SUPPORT; 208 } 209 ctrlset_buf[OSC_CONTROL_TYPE] |= ctrlset; 210 status = acpi_run_osc(handle, ctrlset_buf); 211 if (ACPI_FAILURE (status)) { 212 ctrlset_buf[OSC_CONTROL_TYPE] &= ~ctrlset; 213 } 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 * currently we simply return _SxD, if present. 242 */ 243 244 static int acpi_pci_choose_state(struct pci_dev *pdev, pm_message_t state) 245 { 246 /* TBD */ 247 248 return -ENODEV; 249 } 250 251 static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state) 252 { 253 acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev); 254 static int state_conv[] = { 255 [0] = 0, 256 [1] = 1, 257 [2] = 2, 258 [3] = 3, 259 [4] = 3 260 }; 261 int acpi_state = state_conv[(int __force) state]; 262 263 if (!handle) 264 return -ENODEV; 265 return acpi_bus_set_power(handle, acpi_state); 266 } 267 268 269 /* ACPI bus type */ 270 static int acpi_pci_find_device(struct device *dev, acpi_handle *handle) 271 { 272 struct pci_dev * pci_dev; 273 acpi_integer addr; 274 275 pci_dev = to_pci_dev(dev); 276 /* Please ref to ACPI spec for the syntax of _ADR */ 277 addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn); 278 *handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr); 279 if (!*handle) 280 return -ENODEV; 281 return 0; 282 } 283 284 static int acpi_pci_find_root_bridge(struct device *dev, acpi_handle *handle) 285 { 286 int num; 287 unsigned int seg, bus; 288 289 /* 290 * The string should be the same as root bridge's name 291 * Please look at 'pci_scan_bus_parented' 292 */ 293 num = sscanf(dev->bus_id, "pci%04x:%02x", &seg, &bus); 294 if (num != 2) 295 return -ENODEV; 296 *handle = acpi_get_pci_rootbridge_handle(seg, bus); 297 if (!*handle) 298 return -ENODEV; 299 return 0; 300 } 301 302 static struct acpi_bus_type acpi_pci_bus = { 303 .bus = &pci_bus_type, 304 .find_device = acpi_pci_find_device, 305 .find_bridge = acpi_pci_find_root_bridge, 306 }; 307 308 static int __init acpi_pci_init(void) 309 { 310 int ret; 311 312 ret = register_acpi_bus_type(&acpi_pci_bus); 313 if (ret) 314 return 0; 315 platform_pci_choose_state = acpi_pci_choose_state; 316 platform_pci_set_power_state = acpi_pci_set_power_state; 317 return 0; 318 } 319 arch_initcall(acpi_pci_init); 320