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 /*
 224  * _SxD returns the D-state with the highest power
 225  * (lowest D-state number) supported in the S-state "x".
 226  *
 227  * If the devices does not have a _PRW
 228  * (Power Resources for Wake) supporting system wakeup from "x"
 229  * then the OS is free to choose a lower power (higher number
 230  * D-state) than the return value from _SxD.
 231  *
 232  * But if _PRW is enabled at S-state "x", the OS
 233  * must not choose a power lower than _SxD --
 234  * unless the device has an _SxW method specifying
 235  * the lowest power (highest D-state number) the device
 236  * may enter while still able to wake the system.
 237  *
 238  * ie. depending on global OS policy:
 239  *
 240  * if (_PRW at S-state x)
 241  *      choose from highest power _SxD to lowest power _SxW
 242  * else // no _PRW at S-state x
 243  *      choose highest power _SxD or any lower power
 244  *
 245  * currently we simply return _SxD, if present.
 246  */
 247
 248 static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev,
 249         pm_message_t state)
 250 {
 251         int acpi_state;
 252
 253         acpi_state = acpi_pm_device_sleep_state(&pdev->dev,
 254                 device_may_wakeup(&pdev->dev), NULL);
 255         if (acpi_state < 0)
 256                 return PCI_POWER_ERROR;
 257
 258         switch (acpi_state) {
 259         case ACPI_STATE_D0:
 260                 return PCI_D0;
 261         case ACPI_STATE_D1:
 262                 return PCI_D1;
 263         case ACPI_STATE_D2:
 264                 return PCI_D2;
 265         case ACPI_STATE_D3:
 266                 return PCI_D3hot;
 267         }
 268         return PCI_POWER_ERROR;
 269 }
 270
 271 static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
 272 {
 273         acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
 274         static int state_conv[] = {
 275                 [0] = 0,
 276                 [1] = 1,
 277                 [2] = 2,
 278                 [3] = 3,
 279                 [4] = 3
 280         };
 281         int acpi_state = state_conv[(int __force) state];
 282
 283         if (!handle)
 284                 return -ENODEV;
 285         return acpi_bus_set_power(handle, acpi_state);
 286 }
 287
 288
 289 /* ACPI bus type */
 290 static int acpi_pci_find_device(struct device *dev, acpi_handle *handle)
 291 {
 292         struct pci_dev * pci_dev;
 293         acpi_integer    addr;
 294
 295         pci_dev = to_pci_dev(dev);
 296         /* Please ref to ACPI spec for the syntax of _ADR */
 297         addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn);
 298         *handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr);
 299         if (!*handle)
 300                 return -ENODEV;
 301         return 0;
 302 }
 303
 304 static int acpi_pci_find_root_bridge(struct device *dev, acpi_handle *handle)
 305 {
 306         int num;
 307         unsigned int seg, bus;
 308
 309         /*
 310          * The string should be the same as root bridge's name
 311          * Please look at 'pci_scan_bus_parented'
 312          */
 313         num = sscanf(dev->bus_id, "pci%04x:%02x", &seg, &bus);
 314         if (num != 2)
 315                 return -ENODEV;
 316         *handle = acpi_get_pci_rootbridge_handle(seg, bus);
 317         if (!*handle)
 318                 return -ENODEV;
 319         return 0;
 320 }
 321
 322 static struct acpi_bus_type acpi_pci_bus = {
 323         .bus = &pci_bus_type,
 324         .find_device = acpi_pci_find_device,
 325         .find_bridge = acpi_pci_find_root_bridge,
 326 };
 327
 328 static int __init acpi_pci_init(void)
 329 {
 330         int ret;
 331
 332         if (acpi_gbl_FADT.boot_flags & BAF_MSI_NOT_SUPPORTED) {
 333                 printk(KERN_INFO"ACPI FADT declares the system doesn't support MSI, so disable it\n");
 334                 pci_no_msi();
 335         }
 336         ret = register_acpi_bus_type(&acpi_pci_bus);
 337         if (ret)
 338                 return 0;
 339         platform_pci_choose_state = acpi_pci_choose_state;
 340         platform_pci_set_power_state = acpi_pci_set_power_state;
 341         return 0;
 342 }
 343 arch_initcall(acpi_pci_init);