406 строки
10 KiB
C
406 строки
10 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 <linux/pci-aspm.h>
|
|
#include <acpi/acpi.h>
|
|
#include <acpi/acpi_bus.h>
|
|
|
|
#include <linux/pci-acpi.h>
|
|
#include "pci.h"
|
|
|
|
struct acpi_osc_data {
|
|
acpi_handle handle;
|
|
u32 support_set;
|
|
u32 control_set;
|
|
u32 control_query;
|
|
int is_queried;
|
|
struct list_head sibiling;
|
|
};
|
|
static LIST_HEAD(acpi_osc_data_list);
|
|
|
|
struct acpi_osc_args {
|
|
u32 capbuf[3];
|
|
};
|
|
|
|
static DEFINE_MUTEX(pci_acpi_lock);
|
|
|
|
static struct acpi_osc_data *acpi_get_osc_data(acpi_handle handle)
|
|
{
|
|
struct acpi_osc_data *data;
|
|
|
|
list_for_each_entry(data, &acpi_osc_data_list, sibiling) {
|
|
if (data->handle == handle)
|
|
return data;
|
|
}
|
|
data = kzalloc(sizeof(*data), GFP_KERNEL);
|
|
if (!data)
|
|
return NULL;
|
|
INIT_LIST_HEAD(&data->sibiling);
|
|
data->handle = handle;
|
|
list_add_tail(&data->sibiling, &acpi_osc_data_list);
|
|
return data;
|
|
}
|
|
|
|
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_run_osc(acpi_handle handle,
|
|
struct acpi_osc_args *osc_args, u32 *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 errors, flags = osc_args->capbuf[OSC_QUERY_TYPE];
|
|
|
|
/* 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 *)osc_args->capbuf;
|
|
|
|
status = acpi_evaluate_object(handle, "_OSC", &input, &output);
|
|
if (ACPI_FAILURE(status))
|
|
return status;
|
|
|
|
if (!output.length)
|
|
return AE_NULL_OBJECT;
|
|
|
|
out_obj = output.pointer;
|
|
if (out_obj->type != ACPI_TYPE_BUFFER) {
|
|
printk(KERN_DEBUG "Evaluate _OSC returns wrong type\n");
|
|
status = AE_TYPE;
|
|
goto out_kfree;
|
|
}
|
|
/* Need to ignore the bit0 in result code */
|
|
errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
|
|
if (errors) {
|
|
if (errors & OSC_REQUEST_ERROR)
|
|
printk(KERN_DEBUG "_OSC request fails\n");
|
|
if (errors & OSC_INVALID_UUID_ERROR)
|
|
printk(KERN_DEBUG "_OSC invalid UUID\n");
|
|
if (errors & OSC_INVALID_REVISION_ERROR)
|
|
printk(KERN_DEBUG "_OSC invalid revision\n");
|
|
if (errors & OSC_CAPABILITIES_MASK_ERROR) {
|
|
if (flags & OSC_QUERY_ENABLE)
|
|
goto out_success;
|
|
printk(KERN_DEBUG "_OSC FW not grant req. control\n");
|
|
status = AE_SUPPORT;
|
|
goto out_kfree;
|
|
}
|
|
status = AE_ERROR;
|
|
goto out_kfree;
|
|
}
|
|
out_success:
|
|
*retval = *((u32 *)(out_obj->buffer.pointer + 8));
|
|
status = AE_OK;
|
|
|
|
out_kfree:
|
|
kfree(output.pointer);
|
|
return status;
|
|
}
|
|
|
|
static acpi_status __acpi_query_osc(u32 flags, struct acpi_osc_data *osc_data)
|
|
{
|
|
acpi_status status;
|
|
u32 support_set, result;
|
|
struct acpi_osc_args osc_args;
|
|
|
|
/* do _OSC query for all possible controls */
|
|
support_set = osc_data->support_set | (flags & OSC_SUPPORT_MASKS);
|
|
osc_args.capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
|
|
osc_args.capbuf[OSC_SUPPORT_TYPE] = support_set;
|
|
osc_args.capbuf[OSC_CONTROL_TYPE] = OSC_CONTROL_MASKS;
|
|
|
|
status = acpi_run_osc(osc_data->handle, &osc_args, &result);
|
|
if (ACPI_SUCCESS(status)) {
|
|
osc_data->support_set = support_set;
|
|
osc_data->control_query = result;
|
|
osc_data->is_queried = 1;
|
|
}
|
|
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* pci_acpi_osc_support: Invoke _OSC indicating support for the given feature
|
|
* @flags: Bitmask of flags to support
|
|
*
|
|
* See the ACPI spec for the definition of the flags
|
|
*/
|
|
int pci_acpi_osc_support(acpi_handle handle, u32 flags)
|
|
{
|
|
acpi_status status;
|
|
acpi_handle tmp;
|
|
struct acpi_osc_data *osc_data;
|
|
int rc = 0;
|
|
|
|
status = acpi_get_handle(handle, "_OSC", &tmp);
|
|
if (ACPI_FAILURE(status))
|
|
return -ENOTTY;
|
|
|
|
mutex_lock(&pci_acpi_lock);
|
|
osc_data = acpi_get_osc_data(handle);
|
|
if (!osc_data) {
|
|
printk(KERN_ERR "acpi osc data array is full\n");
|
|
rc = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
__acpi_query_osc(flags, osc_data);
|
|
out:
|
|
mutex_unlock(&pci_acpi_lock);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* 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 control_req, control_set, result;
|
|
acpi_handle tmp;
|
|
struct acpi_osc_data *osc_data;
|
|
struct acpi_osc_args osc_args;
|
|
|
|
status = acpi_get_handle(handle, "_OSC", &tmp);
|
|
if (ACPI_FAILURE(status))
|
|
return status;
|
|
|
|
mutex_lock(&pci_acpi_lock);
|
|
osc_data = acpi_get_osc_data(handle);
|
|
if (!osc_data) {
|
|
printk(KERN_ERR "acpi osc data array is full\n");
|
|
status = AE_ERROR;
|
|
goto out;
|
|
}
|
|
|
|
control_req = (flags & OSC_CONTROL_MASKS);
|
|
if (!control_req) {
|
|
status = AE_TYPE;
|
|
goto out;
|
|
}
|
|
|
|
/* No need to evaluate _OSC if the control was already granted. */
|
|
if ((osc_data->control_set & control_req) == control_req)
|
|
goto out;
|
|
|
|
if (!osc_data->is_queried) {
|
|
status = __acpi_query_osc(osc_data->support_set, osc_data);
|
|
if (ACPI_FAILURE(status))
|
|
goto out;
|
|
}
|
|
|
|
if ((osc_data->control_query & control_req) != control_req) {
|
|
status = AE_SUPPORT;
|
|
goto out;
|
|
}
|
|
|
|
control_set = osc_data->control_set | control_req;
|
|
osc_args.capbuf[OSC_QUERY_TYPE] = 0;
|
|
osc_args.capbuf[OSC_SUPPORT_TYPE] = osc_data->support_set;
|
|
osc_args.capbuf[OSC_CONTROL_TYPE] = control_set;
|
|
status = acpi_run_osc(handle, &osc_args, &result);
|
|
if (ACPI_SUCCESS(status))
|
|
osc_data->control_set = result;
|
|
out:
|
|
mutex_unlock(&pci_acpi_lock);
|
|
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
|
|
*/
|
|
|
|
static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev)
|
|
{
|
|
int acpi_state;
|
|
|
|
acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL);
|
|
if (acpi_state < 0)
|
|
return PCI_POWER_ERROR;
|
|
|
|
switch (acpi_state) {
|
|
case ACPI_STATE_D0:
|
|
return PCI_D0;
|
|
case ACPI_STATE_D1:
|
|
return PCI_D1;
|
|
case ACPI_STATE_D2:
|
|
return PCI_D2;
|
|
case ACPI_STATE_D3:
|
|
return PCI_D3hot;
|
|
}
|
|
return PCI_POWER_ERROR;
|
|
}
|
|
|
|
static bool acpi_pci_power_manageable(struct pci_dev *dev)
|
|
{
|
|
acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
|
|
|
|
return handle ? acpi_bus_power_manageable(handle) : false;
|
|
}
|
|
|
|
static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
|
|
{
|
|
acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
|
|
acpi_handle tmp;
|
|
static const u8 state_conv[] = {
|
|
[PCI_D0] = ACPI_STATE_D0,
|
|
[PCI_D1] = ACPI_STATE_D1,
|
|
[PCI_D2] = ACPI_STATE_D2,
|
|
[PCI_D3hot] = ACPI_STATE_D3,
|
|
[PCI_D3cold] = ACPI_STATE_D3
|
|
};
|
|
int error = -EINVAL;
|
|
|
|
/* If the ACPI device has _EJ0, ignore the device */
|
|
if (!handle || ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp)))
|
|
return -ENODEV;
|
|
|
|
switch (state) {
|
|
case PCI_D0:
|
|
case PCI_D1:
|
|
case PCI_D2:
|
|
case PCI_D3hot:
|
|
case PCI_D3cold:
|
|
error = acpi_bus_set_power(handle, state_conv[state]);
|
|
}
|
|
|
|
if (!error)
|
|
dev_printk(KERN_INFO, &dev->dev,
|
|
"power state changed by ACPI to D%d\n", state);
|
|
|
|
return error;
|
|
}
|
|
|
|
static bool acpi_pci_can_wakeup(struct pci_dev *dev)
|
|
{
|
|
acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
|
|
|
|
return handle ? acpi_bus_can_wakeup(handle) : false;
|
|
}
|
|
|
|
static int acpi_pci_sleep_wake(struct pci_dev *dev, bool enable)
|
|
{
|
|
int error = acpi_pm_device_sleep_wake(&dev->dev, enable);
|
|
|
|
if (!error)
|
|
dev_printk(KERN_INFO, &dev->dev,
|
|
"wake-up capability %s by ACPI\n",
|
|
enable ? "enabled" : "disabled");
|
|
return error;
|
|
}
|
|
|
|
static struct pci_platform_pm_ops acpi_pci_platform_pm = {
|
|
.is_manageable = acpi_pci_power_manageable,
|
|
.set_state = acpi_pci_set_power_state,
|
|
.choose_state = acpi_pci_choose_state,
|
|
.can_wakeup = acpi_pci_can_wakeup,
|
|
.sleep_wake = acpi_pci_sleep_wake,
|
|
};
|
|
|
|
/* ACPI bus type */
|
|
static int acpi_pci_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 acpi_pci_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_name(dev), "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 acpi_pci_bus = {
|
|
.bus = &pci_bus_type,
|
|
.find_device = acpi_pci_find_device,
|
|
.find_bridge = acpi_pci_find_root_bridge,
|
|
};
|
|
|
|
static int __init acpi_pci_init(void)
|
|
{
|
|
int ret;
|
|
|
|
if (acpi_gbl_FADT.boot_flags & BAF_MSI_NOT_SUPPORTED) {
|
|
printk(KERN_INFO"ACPI FADT declares the system doesn't support MSI, so disable it\n");
|
|
pci_no_msi();
|
|
}
|
|
|
|
if (acpi_gbl_FADT.boot_flags & BAF_PCIE_ASPM_CONTROL) {
|
|
printk(KERN_INFO"ACPI FADT declares the system doesn't support PCIe ASPM, so disable it\n");
|
|
pcie_no_aspm();
|
|
}
|
|
|
|
ret = register_acpi_bus_type(&acpi_pci_bus);
|
|
if (ret)
|
|
return 0;
|
|
pci_set_platform_pm(&acpi_pci_platform_pm);
|
|
return 0;
|
|
}
|
|
arch_initcall(acpi_pci_init);
|