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 struct acpi_osc_data {
  23         acpi_handle handle;
  24         u32 support_set;
  25         u32 control_set;
  26         int is_queried;
  27         u32 query_result;
  28         struct list_head sibiling;
  29 };
  30 static LIST_HEAD(acpi_osc_data_list);
  31
  32 struct acpi_osc_args {
  33         u32 capbuf[3];
  34         u32 query_result;
  35 };
  36
  37 static struct acpi_osc_data *acpi_get_osc_data(acpi_handle handle)
  38 {
  39         struct acpi_osc_data *data;
  40
  41         list_for_each_entry(data, &acpi_osc_data_list, sibiling) {
  42                 if (data->handle == handle)
  43                         return data;
  44         }
  45         data = kzalloc(sizeof(*data), GFP_KERNEL);
  46         if (!data)
  47                 return NULL;
  48         INIT_LIST_HEAD(&data->sibiling);
  49         data->handle = handle;
  50         list_add_tail(&data->sibiling, &acpi_osc_data_list);
  51         return data;
  52 }
  53
  54 static u8 OSC_UUID[16] = {0x5B, 0x4D, 0xDB, 0x33, 0xF7, 0x1F, 0x1C, 0x40, 0x96, 0x57, 0x74, 0x41, 0xC0, 0x3D, 0xD7, 0x66};
  55
  56 static acpi_status acpi_run_osc(acpi_handle handle,
  57                                 struct acpi_osc_args *osc_args)
  58 {
  59         acpi_status status;
  60         struct acpi_object_list input;
  61         union acpi_object in_params[4];
  62         struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
  63         union acpi_object *out_obj;
  64         u32 osc_dw0, flags = osc_args->capbuf[OSC_QUERY_TYPE];
  65
  66         /* Setting up input parameters */
  67         input.count = 4;
  68         input.pointer = in_params;
  69         in_params[0].type               = ACPI_TYPE_BUFFER;
  70         in_params[0].buffer.length      = 16;
  71         in_params[0].buffer.pointer     = OSC_UUID;
  72         in_params[1].type               = ACPI_TYPE_INTEGER;
  73         in_params[1].integer.value      = 1;
  74         in_params[2].type               = ACPI_TYPE_INTEGER;
  75         in_params[2].integer.value      = 3;
  76         in_params[3].type               = ACPI_TYPE_BUFFER;
  77         in_params[3].buffer.length      = 12;
  78         in_params[3].buffer.pointer     = (u8 *)osc_args->capbuf;
  79
  80         status = acpi_evaluate_object(handle, "_OSC", &input, &output);
  81         if (ACPI_FAILURE(status))
  82                 return status;
  83
  84         out_obj = output.pointer;
  85         if (out_obj->type != ACPI_TYPE_BUFFER) {
  86                 printk(KERN_DEBUG "Evaluate _OSC returns wrong type\n");
  87                 status = AE_TYPE;
  88                 goto out_kfree;
  89         }
  90         osc_dw0 = *((u32 *) out_obj->buffer.pointer);
  91         if (osc_dw0) {
  92                 if (osc_dw0 & OSC_REQUEST_ERROR)
  93                         printk(KERN_DEBUG "_OSC request fails\n");
  94                 if (osc_dw0 & OSC_INVALID_UUID_ERROR)
  95                         printk(KERN_DEBUG "_OSC invalid UUID\n");
  96                 if (osc_dw0 & OSC_INVALID_REVISION_ERROR)
  97                         printk(KERN_DEBUG "_OSC invalid revision\n");
  98                 if (osc_dw0 & OSC_CAPABILITIES_MASK_ERROR) {
  99                         if (flags & OSC_QUERY_ENABLE)
 100                                 goto out_success;
 101                         printk(KERN_DEBUG "_OSC FW not grant req. control\n");
 102                         status = AE_SUPPORT;
 103                         goto out_kfree;
 104                 }
 105                 status = AE_ERROR;
 106                 goto out_kfree;
 107         }
 108 out_success:
 109         if (flags & OSC_QUERY_ENABLE)
 110                 osc_args->query_result =
 111                         *((u32 *)(out_obj->buffer.pointer + 8));
 112         status = AE_OK;
 113
 114 out_kfree:
 115         kfree(output.pointer);
 116         return status;
 117 }
 118
 119 static acpi_status acpi_query_osc(acpi_handle handle,
 120                                   u32 level, void *context, void **retval)
 121 {
 122         acpi_status status;
 123         acpi_status *ret_status = (acpi_status *)retval;
 124         struct acpi_osc_data *osc_data;
 125         u32 flags = (unsigned long)context, support_set;
 126         acpi_handle tmp;
 127         struct acpi_osc_args osc_args;
 128
 129         status = acpi_get_handle(handle, "_OSC", &tmp);
 130         if (ACPI_FAILURE(status))
 131                 return status;
 132
 133         osc_data = acpi_get_osc_data(handle);
 134         if (!osc_data) {
 135                 printk(KERN_ERR "acpi osc data array is full\n");
 136                 return AE_ERROR;
 137         }
 138
 139         /* do _OSC query for all possible controls */
 140         support_set = osc_data->support_set | (flags & OSC_SUPPORT_MASKS);
 141         osc_args.capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
 142         osc_args.capbuf[OSC_SUPPORT_TYPE] = support_set;
 143         osc_args.capbuf[OSC_CONTROL_TYPE] = OSC_CONTROL_MASKS;
 144
 145         status = acpi_run_osc(handle, &osc_args);
 146         *ret_status = status;
 147
 148         if (ACPI_SUCCESS(status)) {
 149                 osc_data->support_set = support_set;
 150                 osc_data->query_result = osc_args.query_result;
 151                 osc_data->is_queried = 1;
 152         }
 153
 154         return status;
 155 }
 156
 157 /**
 158  * __pci_osc_support_set - register OS support to Firmware
 159  * @flags: OS support bits
 160  * @hid: hardware ID
 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, const char *hid)
 166 {
 167         acpi_status retval = AE_NOT_FOUND;
 168
 169         if (!(flags & OSC_SUPPORT_MASKS)) {
 170                 return AE_TYPE;
 171         }
 172         acpi_get_devices(hid,
 173                         acpi_query_osc,
 174                         (void *)(unsigned long)flags,
 175                         (void **) &retval );
 176         return AE_OK;
 177 }
 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, control_set;
 190         acpi_handle tmp;
 191         struct acpi_osc_data *osc_data;
 192         struct acpi_osc_args osc_args;
 193
 194         status = acpi_get_handle(handle, "_OSC", &tmp);
 195         if (ACPI_FAILURE(status))
 196                 return status;
 197
 198         osc_data = acpi_get_osc_data(handle);
 199         if (!osc_data) {
 200                 printk(KERN_ERR "acpi osc data array is full\n");
 201                 return AE_ERROR;
 202         }
 203
 204         ctrlset = (flags & OSC_CONTROL_MASKS);
 205         if (!ctrlset)
 206                 return AE_TYPE;
 207
 208         if (osc_data->is_queried &&
 209             ((osc_data->query_result & ctrlset) != ctrlset))
 210                 return AE_SUPPORT;
 211
 212         control_set = osc_data->control_set | ctrlset;
 213         osc_args.capbuf[OSC_QUERY_TYPE] = 0;
 214         osc_args.capbuf[OSC_SUPPORT_TYPE] = osc_data->support_set;
 215         osc_args.capbuf[OSC_CONTROL_TYPE] = control_set;
 216         status = acpi_run_osc(handle, &osc_args);
 217         if (ACPI_SUCCESS(status))
 218                 osc_data->control_set = control_set;
 219
 220         return status;
 221 }
 222 EXPORT_SYMBOL(pci_osc_control_set);
 223
 224 #ifdef CONFIG_ACPI_SLEEP
 225 /*
 226  * _SxD returns the D-state with the highest power
 227  * (lowest D-state number) supported in the S-state "x".
 228  *
 229  * If the devices does not have a _PRW
 230  * (Power Resources for Wake) supporting system wakeup from "x"
 231  * then the OS is free to choose a lower power (higher number
 232  * D-state) than the return value from _SxD.
 233  *
 234  * But if _PRW is enabled at S-state "x", the OS
 235  * must not choose a power lower than _SxD --
 236  * unless the device has an _SxW method specifying
 237  * the lowest power (highest D-state number) the device
 238  * may enter while still able to wake the system.
 239  *
 240  * ie. depending on global OS policy:
 241  *
 242  * if (_PRW at S-state x)
 243  *      choose from highest power _SxD to lowest power _SxW
 244  * else // no _PRW at S-state x
 245  *      choose highest power _SxD or any lower power
 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 #endif
 271
 272 static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
 273 {
 274         acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
 275         acpi_handle tmp;
 276         static const u8 state_conv[] = {
 277                 [PCI_D0] = ACPI_STATE_D0,
 278                 [PCI_D1] = ACPI_STATE_D1,
 279                 [PCI_D2] = ACPI_STATE_D2,
 280                 [PCI_D3hot] = ACPI_STATE_D3,
 281                 [PCI_D3cold] = ACPI_STATE_D3
 282         };
 283
 284         if (!handle)
 285                 return -ENODEV;
 286         /* If the ACPI device has _EJ0, ignore the device */
 287         if (ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp)))
 288                 return 0;
 289
 290         switch (state) {
 291         case PCI_D0:
 292         case PCI_D1:
 293         case PCI_D2:
 294         case PCI_D3hot:
 295         case PCI_D3cold:
 296                 return acpi_bus_set_power(handle, state_conv[state]);
 297         }
 298         return -EINVAL;
 299 }
 300
 301
 302 /* ACPI bus type */
 303 static int acpi_pci_find_device(struct device *dev, acpi_handle *handle)
 304 {
 305         struct pci_dev * pci_dev;
 306         acpi_integer    addr;
 307
 308         pci_dev = to_pci_dev(dev);
 309         /* Please ref to ACPI spec for the syntax of _ADR */
 310         addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn);
 311         *handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr);
 312         if (!*handle)
 313                 return -ENODEV;
 314         return 0;
 315 }
 316
 317 static int acpi_pci_find_root_bridge(struct device *dev, acpi_handle *handle)
 318 {
 319         int num;
 320         unsigned int seg, bus;
 321
 322         /*
 323          * The string should be the same as root bridge's name
 324          * Please look at 'pci_scan_bus_parented'
 325          */
 326         num = sscanf(dev->bus_id, "pci%04x:%02x", &seg, &bus);
 327         if (num != 2)
 328                 return -ENODEV;
 329         *handle = acpi_get_pci_rootbridge_handle(seg, bus);
 330         if (!*handle)
 331                 return -ENODEV;
 332         return 0;
 333 }
 334
 335 static struct acpi_bus_type acpi_pci_bus = {
 336         .bus = &pci_bus_type,
 337         .find_device = acpi_pci_find_device,
 338         .find_bridge = acpi_pci_find_root_bridge,
 339 };
 340
 341 static int __init acpi_pci_init(void)
 342 {
 343         int ret;
 344
 345         if (acpi_gbl_FADT.boot_flags & BAF_MSI_NOT_SUPPORTED) {
 346                 printk(KERN_INFO"ACPI FADT declares the system doesn't support MSI, so disable it\n");
 347                 pci_no_msi();
 348         }
 349         ret = register_acpi_bus_type(&acpi_pci_bus);
 350         if (ret)
 351                 return 0;
 352 #ifdef  CONFIG_ACPI_SLEEP
 353         platform_pci_choose_state = acpi_pci_choose_state;
 354 #endif
 355         platform_pci_set_power_state = acpi_pci_set_power_state;
 356         return 0;
 357 }
 358 arch_initcall(acpi_pci_init);