![Rafael J. Wysocki](/assets/img/avatar_default.png)
* acpi-pnp: ACPI / PNP: Use ACPI_COMPANION() instead of ACPI_HANDLE() ACPI / PNP: do ACPI binding directly * acpi-pci: ACPI / PCI: Use ACPI_COMPANION() instead of ACPI_HANDLE()
367 lines
8.8 KiB
C
367 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 <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 - Root bus wakeup notification fork function.
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* @work: Work item to handle.
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*/
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static void pci_acpi_wake_bus(struct work_struct *work)
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{
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struct acpi_device *adev;
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struct acpi_pci_root *root;
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adev = container_of(work, struct acpi_device, wakeup.context.work);
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root = acpi_driver_data(adev);
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pci_pme_wakeup_bus(root->bus);
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}
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/**
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* pci_acpi_wake_dev - PCI device wakeup notification work function.
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* @handle: ACPI handle of a device the notification is for.
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* @work: Work item to handle.
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*/
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static void pci_acpi_wake_dev(struct work_struct *work)
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{
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struct acpi_device_wakeup_context *context;
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struct pci_dev *pci_dev;
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context = container_of(work, struct acpi_device_wakeup_context, work);
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pci_dev = to_pci_dev(context->dev);
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if (pci_dev->pme_poll)
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pci_dev->pme_poll = false;
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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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/* Clear PME Status if set. */
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if (pci_dev->pme_support)
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pci_check_pme_status(pci_dev);
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pci_wakeup_event(pci_dev);
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pm_runtime_resume(&pci_dev->dev);
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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 root PCI bus.
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* @dev: PCI root bridge ACPI device.
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*/
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acpi_status pci_acpi_add_bus_pm_notifier(struct acpi_device *dev)
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{
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return acpi_add_pm_notifier(dev, NULL, 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_dev->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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struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
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return adev ? acpi_device_power_manageable(adev) : 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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struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
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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_COLD,
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[PCI_D3cold] = ACPI_STATE_D3_COLD,
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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 (!adev || acpi_has_method(adev->handle, "_EJ0"))
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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_device_set_power(adev, state_conv[state]);
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}
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if (!error)
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dev_dbg(&dev->dev, "power state changed by ACPI to %s\n",
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acpi_power_state_string(state_conv[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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struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
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return adev ? acpi_device_can_wakeup(adev) : 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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.sleep_wake = acpi_pci_sleep_wake,
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.run_wake = acpi_pci_run_wake,
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};
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void acpi_pci_add_bus(struct pci_bus *bus)
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{
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if (acpi_pci_disabled || !bus->bridge)
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return;
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acpi_pci_slot_enumerate(bus);
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acpiphp_enumerate_slots(bus);
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}
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void acpi_pci_remove_bus(struct pci_bus *bus)
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{
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if (acpi_pci_disabled || !bus->bridge)
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return;
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acpiphp_remove_slots(bus);
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acpi_pci_slot_remove(bus);
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}
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/* ACPI bus type */
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static struct acpi_device *acpi_pci_find_companion(struct device *dev)
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{
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struct pci_dev *pci_dev = to_pci_dev(dev);
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bool check_children;
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u64 addr;
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check_children = pci_is_bridge(pci_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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return acpi_find_child_device(ACPI_COMPANION(dev->parent), addr,
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check_children);
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}
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static void pci_acpi_setup(struct device *dev)
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{
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struct pci_dev *pci_dev = to_pci_dev(dev);
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struct acpi_device *adev = ACPI_COMPANION(dev);
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if (!adev)
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return;
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pci_acpi_add_pm_notifier(adev, pci_dev);
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if (!adev->wakeup.flags.valid)
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return;
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device_set_wakeup_capable(dev, true);
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acpi_pci_sleep_wake(pci_dev, false);
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if (adev->wakeup.flags.run_wake)
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device_set_run_wake(dev, true);
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}
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static void pci_acpi_cleanup(struct device *dev)
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{
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struct acpi_device *adev = ACPI_COMPANION(dev);
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if (!adev)
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return;
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pci_acpi_remove_pm_notifier(adev);
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if (adev->wakeup.flags.valid) {
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device_set_wakeup_capable(dev, false);
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device_set_run_wake(dev, false);
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}
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}
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static bool pci_acpi_bus_match(struct device *dev)
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{
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return dev_is_pci(dev);
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}
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static struct acpi_bus_type acpi_pci_bus = {
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.name = "PCI",
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.match = pci_acpi_bus_match,
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.find_companion = acpi_pci_find_companion,
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.setup = pci_acpi_setup,
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.cleanup = pci_acpi_cleanup,
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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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pr_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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pr_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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acpi_pci_slot_init();
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acpiphp_init();
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return 0;
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}
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arch_initcall(acpi_pci_init);
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