drivers/pci/pci-acpi.c

   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);