Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * File: pci-acpi.c |
Len Brown | a406d9e | 2005-03-23 16:16:03 -0500 | [diff] [blame] | 3 | * Purpose: Provide PCI support in ACPI |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * |
David Shaohua Li | 84df749f | 2005-03-18 18:53:36 -0500 | [diff] [blame] | 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. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
David Shaohua Li | 0f64474 | 2005-03-19 00:15:48 -0500 | [diff] [blame] | 20 | #include "pci.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | |
| 22 | static u32 ctrlset_buf[3] = {0, 0, 0}; |
| 23 | static u32 global_ctrlsets = 0; |
Greg KH | bc56b9e | 2005-04-08 14:53:31 +0900 | [diff] [blame] | 24 | static u8 OSC_UUID[16] = {0x5B, 0x4D, 0xDB, 0x33, 0xF7, 0x1F, 0x1C, 0x40, 0x96, 0x57, 0x74, 0x41, 0xC0, 0x3D, 0xD7, 0x66}; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
| 37 | union acpi_object out_obj; |
| 38 | u32 osc_dw0; |
| 39 | |
| 40 | /* Setting up output buffer */ |
| 41 | output.length = sizeof(out_obj) + 3*sizeof(u32); |
| 42 | output.pointer = &out_obj; |
| 43 | |
| 44 | /* Setting up input parameters */ |
| 45 | input.count = 4; |
| 46 | input.pointer = in_params; |
| 47 | in_params[0].type = ACPI_TYPE_BUFFER; |
| 48 | in_params[0].buffer.length = 16; |
| 49 | in_params[0].buffer.pointer = OSC_UUID; |
| 50 | in_params[1].type = ACPI_TYPE_INTEGER; |
| 51 | in_params[1].integer.value = 1; |
| 52 | in_params[2].type = ACPI_TYPE_INTEGER; |
| 53 | in_params[2].integer.value = 3; |
| 54 | in_params[3].type = ACPI_TYPE_BUFFER; |
| 55 | in_params[3].buffer.length = 12; |
| 56 | in_params[3].buffer.pointer = (u8 *)context; |
| 57 | |
| 58 | status = acpi_evaluate_object(handle, "_OSC", &input, &output); |
| 59 | if (ACPI_FAILURE (status)) { |
| 60 | printk(KERN_DEBUG |
| 61 | "Evaluate _OSC Set fails. Status = 0x%04x\n", status); |
| 62 | return status; |
| 63 | } |
| 64 | if (out_obj.type != ACPI_TYPE_BUFFER) { |
| 65 | printk(KERN_DEBUG |
| 66 | "Evaluate _OSC returns wrong type\n"); |
| 67 | return AE_TYPE; |
| 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 | return AE_OK; |
| 81 | } |
| 82 | return AE_ERROR; |
| 83 | } |
| 84 | |
| 85 | /* Update Global Control Set */ |
| 86 | global_ctrlsets = *((u32 *)(out_obj.buffer.pointer + 8)); |
| 87 | return AE_OK; |
| 88 | } |
| 89 | |
| 90 | |
| 91 | static acpi_status |
| 92 | acpi_run_osc ( |
| 93 | acpi_handle handle, |
rajesh.shah@intel.com | 427bf53 | 2005-10-31 16:20:11 -0800 | [diff] [blame] | 94 | void *context) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | { |
| 96 | acpi_status status; |
| 97 | struct acpi_object_list input; |
| 98 | union acpi_object in_params[4]; |
| 99 | struct acpi_buffer output; |
| 100 | union acpi_object out_obj; |
| 101 | u32 osc_dw0; |
| 102 | |
| 103 | /* Setting up output buffer */ |
| 104 | output.length = sizeof(out_obj) + 3*sizeof(u32); |
| 105 | output.pointer = &out_obj; |
| 106 | |
| 107 | /* Setting up input parameters */ |
| 108 | input.count = 4; |
| 109 | input.pointer = in_params; |
| 110 | in_params[0].type = ACPI_TYPE_BUFFER; |
| 111 | in_params[0].buffer.length = 16; |
| 112 | in_params[0].buffer.pointer = OSC_UUID; |
| 113 | in_params[1].type = ACPI_TYPE_INTEGER; |
| 114 | in_params[1].integer.value = 1; |
| 115 | in_params[2].type = ACPI_TYPE_INTEGER; |
| 116 | in_params[2].integer.value = 3; |
| 117 | in_params[3].type = ACPI_TYPE_BUFFER; |
| 118 | in_params[3].buffer.length = 12; |
| 119 | in_params[3].buffer.pointer = (u8 *)context; |
| 120 | |
| 121 | status = acpi_evaluate_object(handle, "_OSC", &input, &output); |
| 122 | if (ACPI_FAILURE (status)) { |
| 123 | printk(KERN_DEBUG |
| 124 | "Evaluate _OSC Set fails. Status = 0x%04x\n", status); |
| 125 | return status; |
| 126 | } |
| 127 | if (out_obj.type != ACPI_TYPE_BUFFER) { |
| 128 | printk(KERN_DEBUG |
| 129 | "Evaluate _OSC returns wrong type\n"); |
| 130 | return AE_TYPE; |
| 131 | } |
| 132 | osc_dw0 = *((u32 *) out_obj.buffer.pointer); |
| 133 | if (osc_dw0) { |
| 134 | if (osc_dw0 & OSC_REQUEST_ERROR) |
| 135 | printk(KERN_DEBUG "_OSC request fails\n"); |
| 136 | if (osc_dw0 & OSC_INVALID_UUID_ERROR) |
| 137 | printk(KERN_DEBUG "_OSC invalid UUID\n"); |
| 138 | if (osc_dw0 & OSC_INVALID_REVISION_ERROR) |
| 139 | printk(KERN_DEBUG "_OSC invalid revision\n"); |
| 140 | if (osc_dw0 & OSC_CAPABILITIES_MASK_ERROR) { |
| 141 | printk(KERN_DEBUG "_OSC FW not grant req. control\n"); |
| 142 | return AE_SUPPORT; |
| 143 | } |
| 144 | return AE_ERROR; |
| 145 | } |
| 146 | return AE_OK; |
| 147 | } |
| 148 | |
| 149 | /** |
| 150 | * pci_osc_support_set - register OS support to Firmware |
| 151 | * @flags: OS support bits |
| 152 | * |
| 153 | * Update OS support fields and doing a _OSC Query to obtain an update |
| 154 | * from Firmware on supported control bits. |
| 155 | **/ |
| 156 | acpi_status pci_osc_support_set(u32 flags) |
| 157 | { |
| 158 | u32 temp; |
| 159 | |
| 160 | if (!(flags & OSC_SUPPORT_MASKS)) { |
| 161 | return AE_TYPE; |
| 162 | } |
| 163 | ctrlset_buf[OSC_SUPPORT_TYPE] |= (flags & OSC_SUPPORT_MASKS); |
| 164 | |
| 165 | /* do _OSC query for all possible controls */ |
| 166 | temp = ctrlset_buf[OSC_CONTROL_TYPE]; |
| 167 | ctrlset_buf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE; |
| 168 | ctrlset_buf[OSC_CONTROL_TYPE] = OSC_CONTROL_MASKS; |
| 169 | acpi_get_devices ( PCI_ROOT_HID_STRING, |
| 170 | acpi_query_osc, |
| 171 | ctrlset_buf, |
| 172 | NULL ); |
| 173 | ctrlset_buf[OSC_QUERY_TYPE] = !OSC_QUERY_ENABLE; |
| 174 | ctrlset_buf[OSC_CONTROL_TYPE] = temp; |
| 175 | return AE_OK; |
| 176 | } |
| 177 | EXPORT_SYMBOL(pci_osc_support_set); |
| 178 | |
| 179 | /** |
| 180 | * pci_osc_control_set - commit requested control to Firmware |
Randy Dunlap | f366633 | 2005-11-23 15:45:04 -0800 | [diff] [blame] | 181 | * @handle: acpi_handle for the target ACPI object |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | * @flags: driver's requested control bits |
| 183 | * |
| 184 | * Attempt to take control from Firmware on requested control bits. |
| 185 | **/ |
rajesh.shah@intel.com | 427bf53 | 2005-10-31 16:20:11 -0800 | [diff] [blame] | 186 | acpi_status pci_osc_control_set(acpi_handle handle, u32 flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | { |
| 188 | acpi_status status; |
| 189 | u32 ctrlset; |
| 190 | |
| 191 | ctrlset = (flags & OSC_CONTROL_MASKS); |
| 192 | if (!ctrlset) { |
| 193 | return AE_TYPE; |
| 194 | } |
| 195 | if (ctrlset_buf[OSC_SUPPORT_TYPE] && |
| 196 | ((global_ctrlsets & ctrlset) != ctrlset)) { |
| 197 | return AE_SUPPORT; |
| 198 | } |
| 199 | ctrlset_buf[OSC_CONTROL_TYPE] |= ctrlset; |
rajesh.shah@intel.com | 427bf53 | 2005-10-31 16:20:11 -0800 | [diff] [blame] | 200 | status = acpi_run_osc(handle, ctrlset_buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | if (ACPI_FAILURE (status)) { |
| 202 | ctrlset_buf[OSC_CONTROL_TYPE] &= ~ctrlset; |
| 203 | } |
| 204 | |
| 205 | return status; |
| 206 | } |
| 207 | EXPORT_SYMBOL(pci_osc_control_set); |
David Shaohua Li | 84df749f | 2005-03-18 18:53:36 -0500 | [diff] [blame] | 208 | |
David Shaohua Li | 0f64474 | 2005-03-19 00:15:48 -0500 | [diff] [blame] | 209 | /* |
| 210 | * _SxD returns the D-state with the highest power |
| 211 | * (lowest D-state number) supported in the S-state "x". |
| 212 | * |
| 213 | * If the devices does not have a _PRW |
| 214 | * (Power Resources for Wake) supporting system wakeup from "x" |
| 215 | * then the OS is free to choose a lower power (higher number |
| 216 | * D-state) than the return value from _SxD. |
| 217 | * |
| 218 | * But if _PRW is enabled at S-state "x", the OS |
| 219 | * must not choose a power lower than _SxD -- |
| 220 | * unless the device has an _SxW method specifying |
| 221 | * the lowest power (highest D-state number) the device |
| 222 | * may enter while still able to wake the system. |
| 223 | * |
| 224 | * ie. depending on global OS policy: |
| 225 | * |
| 226 | * if (_PRW at S-state x) |
| 227 | * choose from highest power _SxD to lowest power _SxW |
| 228 | * else // no _PRW at S-state x |
| 229 | * choose highest power _SxD or any lower power |
| 230 | * |
| 231 | * currently we simply return _SxD, if present. |
| 232 | */ |
| 233 | |
| 234 | static int acpi_pci_choose_state(struct pci_dev *pdev, pm_message_t state) |
| 235 | { |
Len Brown | a406d9e | 2005-03-23 16:16:03 -0500 | [diff] [blame] | 236 | /* TBD */ |
David Shaohua Li | 0f64474 | 2005-03-19 00:15:48 -0500 | [diff] [blame] | 237 | |
David Shaohua Li | 0f64474 | 2005-03-19 00:15:48 -0500 | [diff] [blame] | 238 | return -ENODEV; |
| 239 | } |
| 240 | |
David Shaohua Li | b913100 | 2005-03-19 00:16:18 -0500 | [diff] [blame] | 241 | static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state) |
| 242 | { |
| 243 | acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev); |
| 244 | static int state_conv[] = { |
| 245 | [0] = 0, |
| 246 | [1] = 1, |
| 247 | [2] = 2, |
| 248 | [3] = 3, |
| 249 | [4] = 3 |
| 250 | }; |
| 251 | int acpi_state = state_conv[(int __force) state]; |
| 252 | |
| 253 | if (!handle) |
| 254 | return -ENODEV; |
| 255 | return acpi_bus_set_power(handle, acpi_state); |
| 256 | } |
| 257 | |
| 258 | |
David Shaohua Li | 84df749f | 2005-03-18 18:53:36 -0500 | [diff] [blame] | 259 | /* ACPI bus type */ |
| 260 | static int pci_acpi_find_device(struct device *dev, acpi_handle *handle) |
| 261 | { |
| 262 | struct pci_dev * pci_dev; |
| 263 | acpi_integer addr; |
| 264 | |
| 265 | pci_dev = to_pci_dev(dev); |
| 266 | /* Please ref to ACPI spec for the syntax of _ADR */ |
| 267 | addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn); |
| 268 | *handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr); |
| 269 | if (!*handle) |
| 270 | return -ENODEV; |
| 271 | return 0; |
| 272 | } |
| 273 | |
| 274 | static int pci_acpi_find_root_bridge(struct device *dev, acpi_handle *handle) |
| 275 | { |
| 276 | int num; |
| 277 | unsigned int seg, bus; |
| 278 | |
| 279 | /* |
| 280 | * The string should be the same as root bridge's name |
| 281 | * Please look at 'pci_scan_bus_parented' |
| 282 | */ |
| 283 | num = sscanf(dev->bus_id, "pci%04x:%02x", &seg, &bus); |
| 284 | if (num != 2) |
| 285 | return -ENODEV; |
| 286 | *handle = acpi_get_pci_rootbridge_handle(seg, bus); |
| 287 | if (!*handle) |
| 288 | return -ENODEV; |
| 289 | return 0; |
| 290 | } |
| 291 | |
| 292 | static struct acpi_bus_type pci_acpi_bus = { |
| 293 | .bus = &pci_bus_type, |
| 294 | .find_device = pci_acpi_find_device, |
| 295 | .find_bridge = pci_acpi_find_root_bridge, |
| 296 | }; |
| 297 | |
| 298 | static int __init pci_acpi_init(void) |
| 299 | { |
| 300 | int ret; |
| 301 | |
| 302 | ret = register_acpi_bus_type(&pci_acpi_bus); |
| 303 | if (ret) |
| 304 | return 0; |
David Shaohua Li | 0f64474 | 2005-03-19 00:15:48 -0500 | [diff] [blame] | 305 | platform_pci_choose_state = acpi_pci_choose_state; |
David Shaohua Li | b913100 | 2005-03-19 00:16:18 -0500 | [diff] [blame] | 306 | platform_pci_set_power_state = acpi_pci_set_power_state; |
David Shaohua Li | 84df749f | 2005-03-18 18:53:36 -0500 | [diff] [blame] | 307 | return 0; |
| 308 | } |
| 309 | arch_initcall(pci_acpi_init); |