320 lines
8.2 KiB
C
320 lines
8.2 KiB
C
/*
|
|
* File: pci-acpi.c
|
|
* Purpose: Provide 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 = {ACPI_ALLOCATE_BUFFER, NULL};
|
|
union acpi_object *out_obj;
|
|
u32 osc_dw0;
|
|
|
|
|
|
/* 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;
|
|
}
|
|
out_obj = output.pointer;
|
|
|
|
if (out_obj->type != ACPI_TYPE_BUFFER) {
|
|
printk(KERN_DEBUG
|
|
"Evaluate _OSC returns wrong type\n");
|
|
status = AE_TYPE;
|
|
goto query_osc_out;
|
|
}
|
|
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));
|
|
status = AE_OK;
|
|
goto query_osc_out;
|
|
}
|
|
status = AE_ERROR;
|
|
goto query_osc_out;
|
|
}
|
|
|
|
/* Update Global Control Set */
|
|
global_ctrlsets = *((u32 *)(out_obj->buffer.pointer + 8));
|
|
status = AE_OK;
|
|
|
|
query_osc_out:
|
|
kfree(output.pointer);
|
|
return status;
|
|
}
|
|
|
|
|
|
static acpi_status
|
|
acpi_run_osc (
|
|
acpi_handle handle,
|
|
void *context)
|
|
{
|
|
acpi_status status;
|
|
struct acpi_object_list input;
|
|
union acpi_object in_params[4];
|
|
struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
|
|
union acpi_object *out_obj;
|
|
u32 osc_dw0;
|
|
|
|
/* 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;
|
|
}
|
|
out_obj = output.pointer;
|
|
if (out_obj->type != ACPI_TYPE_BUFFER) {
|
|
printk(KERN_DEBUG
|
|
"Evaluate _OSC returns wrong type\n");
|
|
status = AE_TYPE;
|
|
goto run_osc_out;
|
|
}
|
|
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");
|
|
status = AE_SUPPORT;
|
|
goto run_osc_out;
|
|
}
|
|
status = AE_ERROR;
|
|
goto run_osc_out;
|
|
}
|
|
status = AE_OK;
|
|
|
|
run_osc_out:
|
|
kfree(output.pointer);
|
|
return status;
|
|
}
|
|
|
|
/**
|
|
* 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
|
|
* @handle: acpi_handle for the target ACPI object
|
|
* @flags: driver's requested control bits
|
|
*
|
|
* Attempt to take control from Firmware on requested control bits.
|
|
**/
|
|
acpi_status pci_osc_control_set(acpi_handle handle, 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_run_osc(handle, ctrlset_buf);
|
|
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)
|
|
{
|
|
/* TBD */
|
|
|
|
return -ENODEV;
|
|
}
|
|
|
|
static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
|
|
{
|
|
acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
|
|
static int state_conv[] = {
|
|
[0] = 0,
|
|
[1] = 1,
|
|
[2] = 2,
|
|
[3] = 3,
|
|
[4] = 3
|
|
};
|
|
int acpi_state = state_conv[(int __force) state];
|
|
|
|
if (!handle)
|
|
return -ENODEV;
|
|
return acpi_bus_set_power(handle, acpi_state);
|
|
}
|
|
|
|
|
|
/* 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;
|
|
platform_pci_set_power_state = acpi_pci_set_power_state;
|
|
return 0;
|
|
}
|
|
arch_initcall(pci_acpi_init);
|