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