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/*
* File: pci-acpi.c
* Purpose: Provde PCI support in ACPI
*
* Copyright (C) 2005 David Shaohua Li <shaohua.li@intel.com>
* Copyright (C) 2004 Tom Long Nguyen <tom.l.nguyen@intel.com>
* Copyright (C) 2004 Intel Corp.
*/
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/module.h>
#include <acpi/acpi.h>
#include <acpi/acnamesp.h>
#include <acpi/acresrc.h>
#include <acpi/acpi_bus.h>
#include <linux/pci-acpi.h>
#include "pci.h"
static u32 ctrlset_buf[3] = {0, 0, 0};
static u32 global_ctrlsets = 0;
static u8 OSC_UUID[16] = {0x5B, 0x4D, 0xDB, 0x33, 0xF7, 0x1F, 0x1C, 0x40, 0x96, 0x57, 0x74, 0x41, 0xC0, 0x3D, 0xD7, 0x66};
static acpi_status
acpi_query_osc (
acpi_handle handle,
u32 level,
void *context,
void **retval )
{
acpi_status status;
struct acpi_object_list input;
union acpi_object in_params[4];
struct acpi_buffer output;
union acpi_object out_obj;
u32 osc_dw0;
/* Setting up output buffer */
output.length = sizeof(out_obj) + 3*sizeof(u32);
output.pointer = &out_obj;
/* Setting up input parameters */
input.count = 4;
input.pointer = in_params;
in_params[0].type = ACPI_TYPE_BUFFER;
in_params[0].buffer.length = 16;
in_params[0].buffer.pointer = OSC_UUID;
in_params[1].type = ACPI_TYPE_INTEGER;
in_params[1].integer.value = 1;
in_params[2].type = ACPI_TYPE_INTEGER;
in_params[2].integer.value = 3;
in_params[3].type = ACPI_TYPE_BUFFER;
in_params[3].buffer.length = 12;
in_params[3].buffer.pointer = (u8 *)context;
status = acpi_evaluate_object(handle, "_OSC", &input, &output);
if (ACPI_FAILURE (status)) {
printk(KERN_DEBUG
"Evaluate _OSC Set fails. Status = 0x%04x\n", status);
return status;
}
if (out_obj.type != ACPI_TYPE_BUFFER) {
printk(KERN_DEBUG
"Evaluate _OSC returns wrong type\n");
return AE_TYPE;
}
osc_dw0 = *((u32 *) out_obj.buffer.pointer);
if (osc_dw0) {
if (osc_dw0 & OSC_REQUEST_ERROR)
printk(KERN_DEBUG "_OSC request fails\n");
if (osc_dw0 & OSC_INVALID_UUID_ERROR)
printk(KERN_DEBUG "_OSC invalid UUID\n");
if (osc_dw0 & OSC_INVALID_REVISION_ERROR)
printk(KERN_DEBUG "_OSC invalid revision\n");
if (osc_dw0 & OSC_CAPABILITIES_MASK_ERROR) {
/* Update Global Control Set */
global_ctrlsets = *((u32 *)(out_obj.buffer.pointer+8));
return AE_OK;
}
return AE_ERROR;
}
/* Update Global Control Set */
global_ctrlsets = *((u32 *)(out_obj.buffer.pointer + 8));
return AE_OK;
}
static acpi_status
acpi_run_osc (
acpi_handle handle,
u32 level,
void *context,
void **retval )
{
acpi_status status;
struct acpi_object_list input;
union acpi_object in_params[4];
struct acpi_buffer output;
union acpi_object out_obj;
u32 osc_dw0;
/* Setting up output buffer */
output.length = sizeof(out_obj) + 3*sizeof(u32);
output.pointer = &out_obj;
/* Setting up input parameters */
input.count = 4;
input.pointer = in_params;
in_params[0].type = ACPI_TYPE_BUFFER;
in_params[0].buffer.length = 16;
in_params[0].buffer.pointer = OSC_UUID;
in_params[1].type = ACPI_TYPE_INTEGER;
in_params[1].integer.value = 1;
in_params[2].type = ACPI_TYPE_INTEGER;
in_params[2].integer.value = 3;
in_params[3].type = ACPI_TYPE_BUFFER;
in_params[3].buffer.length = 12;
in_params[3].buffer.pointer = (u8 *)context;
status = acpi_evaluate_object(handle, "_OSC", &input, &output);
if (ACPI_FAILURE (status)) {
printk(KERN_DEBUG
"Evaluate _OSC Set fails. Status = 0x%04x\n", status);
return status;
}
if (out_obj.type != ACPI_TYPE_BUFFER) {
printk(KERN_DEBUG
"Evaluate _OSC returns wrong type\n");
return AE_TYPE;
}
osc_dw0 = *((u32 *) out_obj.buffer.pointer);
if (osc_dw0) {
if (osc_dw0 & OSC_REQUEST_ERROR)
printk(KERN_DEBUG "_OSC request fails\n");
if (osc_dw0 & OSC_INVALID_UUID_ERROR)
printk(KERN_DEBUG "_OSC invalid UUID\n");
if (osc_dw0 & OSC_INVALID_REVISION_ERROR)
printk(KERN_DEBUG "_OSC invalid revision\n");
if (osc_dw0 & OSC_CAPABILITIES_MASK_ERROR) {
printk(KERN_DEBUG "_OSC FW not grant req. control\n");
return AE_SUPPORT;
}
return AE_ERROR;
}
return AE_OK;
}
/**
* pci_osc_support_set - register OS support to Firmware
* @flags: OS support bits
*
* Update OS support fields and doing a _OSC Query to obtain an update
* from Firmware on supported control bits.
**/
acpi_status pci_osc_support_set(u32 flags)
{
u32 temp;
if (!(flags & OSC_SUPPORT_MASKS)) {
return AE_TYPE;
}
ctrlset_buf[OSC_SUPPORT_TYPE] |= (flags & OSC_SUPPORT_MASKS);
/* do _OSC query for all possible controls */
temp = ctrlset_buf[OSC_CONTROL_TYPE];
ctrlset_buf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
ctrlset_buf[OSC_CONTROL_TYPE] = OSC_CONTROL_MASKS;
acpi_get_devices ( PCI_ROOT_HID_STRING,
acpi_query_osc,
ctrlset_buf,
NULL );
ctrlset_buf[OSC_QUERY_TYPE] = !OSC_QUERY_ENABLE;
ctrlset_buf[OSC_CONTROL_TYPE] = temp;
return AE_OK;
}
EXPORT_SYMBOL(pci_osc_support_set);
/**
* pci_osc_control_set - commit requested control to Firmware
* @flags: driver's requested control bits
*
* Attempt to take control from Firmware on requested control bits.
**/
acpi_status pci_osc_control_set(u32 flags)
{
acpi_status status;
u32 ctrlset;
ctrlset = (flags & OSC_CONTROL_MASKS);
if (!ctrlset) {
return AE_TYPE;
}
if (ctrlset_buf[OSC_SUPPORT_TYPE] &&
((global_ctrlsets & ctrlset) != ctrlset)) {
return AE_SUPPORT;
}
ctrlset_buf[OSC_CONTROL_TYPE] |= ctrlset;
status = acpi_get_devices ( PCI_ROOT_HID_STRING,
acpi_run_osc,
ctrlset_buf,
NULL );
if (ACPI_FAILURE (status)) {
ctrlset_buf[OSC_CONTROL_TYPE] &= ~ctrlset;
}
return status;
}
EXPORT_SYMBOL(pci_osc_control_set);
/*
* _SxD returns the D-state with the highest power
* (lowest D-state number) supported in the S-state "x".
*
* If the devices does not have a _PRW
* (Power Resources for Wake) supporting system wakeup from "x"
* then the OS is free to choose a lower power (higher number
* D-state) than the return value from _SxD.
*
* But if _PRW is enabled at S-state "x", the OS
* must not choose a power lower than _SxD --
* unless the device has an _SxW method specifying
* the lowest power (highest D-state number) the device
* may enter while still able to wake the system.
*
* ie. depending on global OS policy:
*
* if (_PRW at S-state x)
* choose from highest power _SxD to lowest power _SxW
* else // no _PRW at S-state x
* choose highest power _SxD or any lower power
*
* currently we simply return _SxD, if present.
*/
static int acpi_pci_choose_state(struct pci_dev *pdev, pm_message_t state)
{
char dstate_str[] = "_S0D";
acpi_status status;
unsigned long val;
struct device *dev = &pdev->dev;
/* Fixme: the check is wrong after pm_message_t is a struct */
if ((state >= PM_SUSPEND_MAX) || !DEVICE_ACPI_HANDLE(dev))
return -EINVAL;
dstate_str[2] += state; /* _S1D, _S2D, _S3D, _S4D */
status = acpi_evaluate_integer(DEVICE_ACPI_HANDLE(dev), dstate_str,
NULL, &val);
if (ACPI_SUCCESS(status))
return val;
return -ENODEV;
}
/* ACPI bus type */
static int pci_acpi_find_device(struct device *dev, acpi_handle *handle)
{
struct pci_dev * pci_dev;
acpi_integer addr;
pci_dev = to_pci_dev(dev);
/* Please ref to ACPI spec for the syntax of _ADR */
addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn);
*handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr);
if (!*handle)
return -ENODEV;
return 0;
}
static int pci_acpi_find_root_bridge(struct device *dev, acpi_handle *handle)
{
int num;
unsigned int seg, bus;
/*
* The string should be the same as root bridge's name
* Please look at 'pci_scan_bus_parented'
*/
num = sscanf(dev->bus_id, "pci%04x:%02x", &seg, &bus);
if (num != 2)
return -ENODEV;
*handle = acpi_get_pci_rootbridge_handle(seg, bus);
if (!*handle)
return -ENODEV;
return 0;
}
static struct acpi_bus_type pci_acpi_bus = {
.bus = &pci_bus_type,
.find_device = pci_acpi_find_device,
.find_bridge = pci_acpi_find_root_bridge,
};
static int __init pci_acpi_init(void)
{
int ret;
ret = register_acpi_bus_type(&pci_acpi_bus);
if (ret)
return 0;
platform_pci_choose_state = acpi_pci_choose_state;
return 0;
}
arch_initcall(pci_acpi_init);
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