/*
* File: pci-acpi.c
* Purpose: Provide PCI supports in ACPI
*
* Copyright (C) 2004 Intel
* Copyright (C) Tom Long Nguyen (tom.l.nguyen@intel.com)
*/
#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>
static u32 ctrlset_buf[3] = {0, 0, 0};
static u32 global_ctrlsets = 0;
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);
