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