351 lines
8.8 KiB
C
351 lines
8.8 KiB
C
/*
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* File: pci-acpi.c
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* Purpose: Provide PCI support in ACPI
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*
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* Copyright (C) 2005 David Shaohua Li <shaohua.li@intel.com>
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* Copyright (C) 2004 Tom Long Nguyen <tom.l.nguyen@intel.com>
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* Copyright (C) 2004 Intel Corp.
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*/
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/pci.h>
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#include <linux/module.h>
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#include <linux/pci-aspm.h>
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#include <acpi/acpi.h>
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#include <acpi/acpi_bus.h>
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#include <linux/pci-acpi.h>
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#include <linux/pm_runtime.h>
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#include <linux/pm_qos.h>
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#include "pci.h"
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/**
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* pci_acpi_wake_bus - Wake-up notification handler for root buses.
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* @handle: ACPI handle of a device the notification is for.
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* @event: Type of the signaled event.
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* @context: PCI root bus to wake up devices on.
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*/
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static void pci_acpi_wake_bus(acpi_handle handle, u32 event, void *context)
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{
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struct pci_bus *pci_bus = context;
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if (event == ACPI_NOTIFY_DEVICE_WAKE && pci_bus)
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pci_pme_wakeup_bus(pci_bus);
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}
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/**
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* pci_acpi_wake_dev - Wake-up notification handler for PCI devices.
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* @handle: ACPI handle of a device the notification is for.
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* @event: Type of the signaled event.
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* @context: PCI device object to wake up.
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*/
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static void pci_acpi_wake_dev(acpi_handle handle, u32 event, void *context)
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{
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struct pci_dev *pci_dev = context;
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if (event != ACPI_NOTIFY_DEVICE_WAKE || !pci_dev)
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return;
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if (pci_dev->current_state == PCI_D3cold) {
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pci_wakeup_event(pci_dev);
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pm_runtime_resume(&pci_dev->dev);
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return;
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}
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if (!pci_dev->pm_cap || !pci_dev->pme_support
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|| pci_check_pme_status(pci_dev)) {
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if (pci_dev->pme_poll)
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pci_dev->pme_poll = false;
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pci_wakeup_event(pci_dev);
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pm_runtime_resume(&pci_dev->dev);
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}
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if (pci_dev->subordinate)
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pci_pme_wakeup_bus(pci_dev->subordinate);
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}
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/**
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* pci_acpi_add_bus_pm_notifier - Register PM notifier for given PCI bus.
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* @dev: ACPI device to add the notifier for.
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* @pci_bus: PCI bus to walk checking for PME status if an event is signaled.
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*/
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acpi_status pci_acpi_add_bus_pm_notifier(struct acpi_device *dev,
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struct pci_bus *pci_bus)
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{
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return acpi_add_pm_notifier(dev, pci_acpi_wake_bus, pci_bus);
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}
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/**
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* pci_acpi_remove_bus_pm_notifier - Unregister PCI bus PM notifier.
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* @dev: ACPI device to remove the notifier from.
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*/
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acpi_status pci_acpi_remove_bus_pm_notifier(struct acpi_device *dev)
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{
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return acpi_remove_pm_notifier(dev, pci_acpi_wake_bus);
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}
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/**
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* pci_acpi_add_pm_notifier - Register PM notifier for given PCI device.
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* @dev: ACPI device to add the notifier for.
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* @pci_dev: PCI device to check for the PME status if an event is signaled.
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*/
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acpi_status pci_acpi_add_pm_notifier(struct acpi_device *dev,
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struct pci_dev *pci_dev)
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{
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return acpi_add_pm_notifier(dev, pci_acpi_wake_dev, pci_dev);
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}
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/**
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* pci_acpi_remove_pm_notifier - Unregister PCI device PM notifier.
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* @dev: ACPI device to remove the notifier from.
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*/
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acpi_status pci_acpi_remove_pm_notifier(struct acpi_device *dev)
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{
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return acpi_remove_pm_notifier(dev, pci_acpi_wake_dev);
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}
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phys_addr_t acpi_pci_root_get_mcfg_addr(acpi_handle handle)
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{
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acpi_status status = AE_NOT_EXIST;
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unsigned long long mcfg_addr;
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if (handle)
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status = acpi_evaluate_integer(handle, METHOD_NAME__CBA,
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NULL, &mcfg_addr);
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if (ACPI_FAILURE(status))
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return 0;
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return (phys_addr_t)mcfg_addr;
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}
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/*
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* _SxD returns the D-state with the highest power
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* (lowest D-state number) supported in the S-state "x".
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*
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* If the devices does not have a _PRW
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* (Power Resources for Wake) supporting system wakeup from "x"
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* then the OS is free to choose a lower power (higher number
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* D-state) than the return value from _SxD.
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*
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* But if _PRW is enabled at S-state "x", the OS
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* must not choose a power lower than _SxD --
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* unless the device has an _SxW method specifying
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* the lowest power (highest D-state number) the device
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* may enter while still able to wake the system.
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*
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* ie. depending on global OS policy:
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*
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* if (_PRW at S-state x)
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* choose from highest power _SxD to lowest power _SxW
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* else // no _PRW at S-state x
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* choose highest power _SxD or any lower power
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*/
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static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev)
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{
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int acpi_state, d_max;
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if (pdev->no_d3cold)
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d_max = ACPI_STATE_D3_HOT;
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else
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d_max = ACPI_STATE_D3_COLD;
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acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL, d_max);
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if (acpi_state < 0)
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return PCI_POWER_ERROR;
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switch (acpi_state) {
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case ACPI_STATE_D0:
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return PCI_D0;
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case ACPI_STATE_D1:
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return PCI_D1;
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case ACPI_STATE_D2:
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return PCI_D2;
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case ACPI_STATE_D3_HOT:
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return PCI_D3hot;
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case ACPI_STATE_D3_COLD:
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return PCI_D3cold;
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}
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return PCI_POWER_ERROR;
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}
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static bool acpi_pci_power_manageable(struct pci_dev *dev)
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{
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acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
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return handle ? acpi_bus_power_manageable(handle) : false;
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}
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static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
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{
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acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
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acpi_handle tmp;
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static const u8 state_conv[] = {
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[PCI_D0] = ACPI_STATE_D0,
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[PCI_D1] = ACPI_STATE_D1,
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[PCI_D2] = ACPI_STATE_D2,
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[PCI_D3hot] = ACPI_STATE_D3,
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[PCI_D3cold] = ACPI_STATE_D3
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};
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int error = -EINVAL;
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/* If the ACPI device has _EJ0, ignore the device */
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if (!handle || ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp)))
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return -ENODEV;
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switch (state) {
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case PCI_D3cold:
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if (dev_pm_qos_flags(&dev->dev, PM_QOS_FLAG_NO_POWER_OFF) ==
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PM_QOS_FLAGS_ALL) {
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error = -EBUSY;
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break;
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}
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case PCI_D0:
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case PCI_D1:
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case PCI_D2:
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case PCI_D3hot:
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error = acpi_bus_set_power(handle, state_conv[state]);
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}
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if (!error)
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dev_info(&dev->dev, "power state changed by ACPI to %s\n",
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pci_power_name(state));
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return error;
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}
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static bool acpi_pci_can_wakeup(struct pci_dev *dev)
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{
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acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
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return handle ? acpi_bus_can_wakeup(handle) : false;
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}
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static void acpi_pci_propagate_wakeup_enable(struct pci_bus *bus, bool enable)
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{
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while (bus->parent) {
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if (!acpi_pm_device_sleep_wake(&bus->self->dev, enable))
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return;
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bus = bus->parent;
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}
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/* We have reached the root bus. */
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if (bus->bridge)
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acpi_pm_device_sleep_wake(bus->bridge, enable);
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}
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static int acpi_pci_sleep_wake(struct pci_dev *dev, bool enable)
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{
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if (acpi_pci_can_wakeup(dev))
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return acpi_pm_device_sleep_wake(&dev->dev, enable);
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acpi_pci_propagate_wakeup_enable(dev->bus, enable);
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return 0;
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}
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static void acpi_pci_propagate_run_wake(struct pci_bus *bus, bool enable)
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{
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while (bus->parent) {
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struct pci_dev *bridge = bus->self;
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if (bridge->pme_interrupt)
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return;
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if (!acpi_pm_device_run_wake(&bridge->dev, enable))
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return;
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bus = bus->parent;
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}
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/* We have reached the root bus. */
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if (bus->bridge)
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acpi_pm_device_run_wake(bus->bridge, enable);
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}
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static int acpi_pci_run_wake(struct pci_dev *dev, bool enable)
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{
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/*
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* Per PCI Express Base Specification Revision 2.0 section
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* 5.3.3.2 Link Wakeup, platform support is needed for D3cold
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* waking up to power on the main link even if there is PME
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* support for D3cold
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*/
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if (dev->pme_interrupt && !dev->runtime_d3cold)
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return 0;
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if (!acpi_pm_device_run_wake(&dev->dev, enable))
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return 0;
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acpi_pci_propagate_run_wake(dev->bus, enable);
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return 0;
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}
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static struct pci_platform_pm_ops acpi_pci_platform_pm = {
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.is_manageable = acpi_pci_power_manageable,
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.set_state = acpi_pci_set_power_state,
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.choose_state = acpi_pci_choose_state,
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.can_wakeup = acpi_pci_can_wakeup,
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.sleep_wake = acpi_pci_sleep_wake,
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.run_wake = acpi_pci_run_wake,
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};
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/* ACPI bus type */
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static int acpi_pci_find_device(struct device *dev, acpi_handle *handle)
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{
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struct pci_dev * pci_dev;
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u64 addr;
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pci_dev = to_pci_dev(dev);
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/* Please ref to ACPI spec for the syntax of _ADR */
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addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn);
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*handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr);
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if (!*handle)
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return -ENODEV;
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return 0;
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}
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static int acpi_pci_find_root_bridge(struct device *dev, acpi_handle *handle)
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{
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int num;
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unsigned int seg, bus;
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/*
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* The string should be the same as root bridge's name
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* Please look at 'pci_scan_bus_parented'
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*/
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num = sscanf(dev_name(dev), "pci%04x:%02x", &seg, &bus);
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if (num != 2)
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return -ENODEV;
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*handle = acpi_get_pci_rootbridge_handle(seg, bus);
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if (!*handle)
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return -ENODEV;
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return 0;
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}
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static struct acpi_bus_type acpi_pci_bus = {
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.bus = &pci_bus_type,
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.find_device = acpi_pci_find_device,
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.find_bridge = acpi_pci_find_root_bridge,
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};
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static int __init acpi_pci_init(void)
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{
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int ret;
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if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_MSI) {
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printk(KERN_INFO"ACPI FADT declares the system doesn't support MSI, so disable it\n");
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pci_no_msi();
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}
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if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) {
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printk(KERN_INFO"ACPI FADT declares the system doesn't support PCIe ASPM, so disable it\n");
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pcie_no_aspm();
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}
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ret = register_acpi_bus_type(&acpi_pci_bus);
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if (ret)
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return 0;
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pci_set_platform_pm(&acpi_pci_platform_pm);
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return 0;
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}
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arch_initcall(acpi_pci_init);
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