drivers/pci/pci-acpi.c

   1 /*
   2  * File:        pci-acpi.c
   3  * Purpose:     Provide PCI supports in ACPI
   4  *
   5  * Copyright (C) 2004 Intel
   6  * Copyright (C) Tom Long Nguyen (tom.l.nguyen@intel.com)
   7  */
   8
   9 #include <linux/delay.h>
  10 #include <linux/init.h>
  11 #include <linux/pci.h>
  12 #include <linux/module.h>
  13 #include <acpi/acpi.h>
  14 #include <acpi/acnamesp.h>
  15 #include <acpi/acresrc.h>
  16 #include <acpi/acpi_bus.h>
  17
  18 #include <linux/pci-acpi.h>
  19
  20 static u32 ctrlset_buf[3] = {0, 0, 0};
  21 static u32 global_ctrlsets = 0;
  22 static u8 OSC_UUID[16] = {0x5B, 0x4D, 0xDB, 0x33, 0xF7, 0x1F, 0x1C, 0x40, 0x96, 0x57, 0x74, 0x41, 0xC0, 0x3D, 0xD7, 0x66};
  23
  24 static acpi_status
  25 acpi_query_osc (
  26         acpi_handle     handle,
  27         u32             level,
  28         void            *context,
  29         void            **retval )
  30 {
  31         acpi_status             status;
  32         struct acpi_object_list input;
  33         union acpi_object       in_params[4];
  34         struct acpi_buffer      output;
  35         union acpi_object       out_obj;
  36         u32                     osc_dw0;
  37
  38         /* Setting up output buffer */
  39         output.length = sizeof(out_obj) + 3*sizeof(u32);
  40         output.pointer = &out_obj;
  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                 return status;
  61         }
  62         if (out_obj.type != ACPI_TYPE_BUFFER) {
  63                 printk(KERN_DEBUG
  64                         "Evaluate _OSC returns wrong type\n");
  65                 return AE_TYPE;
  66         }
  67         osc_dw0 = *((u32 *) out_obj.buffer.pointer);
  68         if (osc_dw0) {
  69                 if (osc_dw0 & OSC_REQUEST_ERROR)
  70                         printk(KERN_DEBUG "_OSC request fails\n");
  71                 if (osc_dw0 & OSC_INVALID_UUID_ERROR)
  72                         printk(KERN_DEBUG "_OSC invalid UUID\n");
  73                 if (osc_dw0 & OSC_INVALID_REVISION_ERROR)
  74                         printk(KERN_DEBUG "_OSC invalid revision\n");
  75                 if (osc_dw0 & OSC_CAPABILITIES_MASK_ERROR) {
  76                         /* Update Global Control Set */
  77                         global_ctrlsets = *((u32 *)(out_obj.buffer.pointer+8));
  78                         return AE_OK;
  79                 }
  80                 return AE_ERROR;
  81         }
  82
  83         /* Update Global Control Set */
  84         global_ctrlsets = *((u32 *)(out_obj.buffer.pointer + 8));
  85         return AE_OK;
  86 }
  87
  88
  89 static acpi_status
  90 acpi_run_osc (
  91         acpi_handle     handle,
  92         u32             level,
  93         void            *context,
  94         void            **retval )
  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  * @flags: driver's requested control bits
 182  *
 183  * Attempt to take control from Firmware on requested control bits.
 184  **/
 185 acpi_status pci_osc_control_set(u32 flags)
 186 {
 187         acpi_status     status;
 188         u32             ctrlset;
 189
 190         ctrlset = (flags & OSC_CONTROL_MASKS);
 191         if (!ctrlset) {
 192                 return AE_TYPE;
 193         }
 194         if (ctrlset_buf[OSC_SUPPORT_TYPE] &&
 195                 ((global_ctrlsets & ctrlset) != ctrlset)) {
 196                 return AE_SUPPORT;
 197         }
 198         ctrlset_buf[OSC_CONTROL_TYPE] |= ctrlset;
 199         status = acpi_get_devices ( PCI_ROOT_HID_STRING,
 200                                 acpi_run_osc,
 201                                 ctrlset_buf,
 202                                 NULL );
 203         if (ACPI_FAILURE (status)) {
 204                 ctrlset_buf[OSC_CONTROL_TYPE] &= ~ctrlset;
 205         }
 206
 207         return status;
 208 }
 209 EXPORT_SYMBOL(pci_osc_control_set);