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