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
  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 pci_acpi_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 pci_acpi_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 pci_acpi_bus = {
 303         .bus = &pci_bus_type,
 304         .find_device = pci_acpi_find_device,
 305         .find_bridge = pci_acpi_find_root_bridge,
 306 };
 307
 308 static int __init pci_acpi_init(void)
 309 {
 310         int ret;
 311
 312         ret = register_acpi_bus_type(&pci_acpi_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(pci_acpi_init);