LXR linux/drivers/pci/pci-mid.c

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Intel MID platform PM support
   4 *
   5 * Copyright (C) 2016, Intel Corporation
   6 *
   7 * Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
   8 */
   9
  10#include <linux/init.h>
  11#include <linux/pci.h>
  12
  13#include <asm/cpu_device_id.h>
  14#include <asm/intel-family.h>
  15#include <asm/intel-mid.h>
  16
  17#include "pci.h"
  18
  19static bool mid_pci_power_manageable(struct pci_dev *dev)
  20{
  21        return true;
  22}
  23
  24static int mid_pci_set_power_state(struct pci_dev *pdev, pci_power_t state)
  25{
  26        return intel_mid_pci_set_power_state(pdev, state);
  27}
  28
  29static pci_power_t mid_pci_get_power_state(struct pci_dev *pdev)
  30{
  31        return intel_mid_pci_get_power_state(pdev);
  32}
  33
  34static pci_power_t mid_pci_choose_state(struct pci_dev *pdev)
  35{
  36        return PCI_D3hot;
  37}
  38
  39static int mid_pci_wakeup(struct pci_dev *dev, bool enable)
  40{
  41        return 0;
  42}
  43
  44static bool mid_pci_need_resume(struct pci_dev *dev)
  45{
  46        return false;
  47}
  48
  49static const struct pci_platform_pm_ops mid_pci_platform_pm = {
  50        .is_manageable  = mid_pci_power_manageable,
  51        .set_state      = mid_pci_set_power_state,
  52        .get_state      = mid_pci_get_power_state,
  53        .choose_state   = mid_pci_choose_state,
  54        .set_wakeup     = mid_pci_wakeup,
  55        .need_resume    = mid_pci_need_resume,
  56};
  57
  58#define ICPU(model)     { X86_VENDOR_INTEL, 6, model, X86_FEATURE_ANY, }
  59
  60/*
  61 * This table should be in sync with the one in
  62 * arch/x86/platform/intel-mid/pwr.c.
  63 */
  64static const struct x86_cpu_id lpss_cpu_ids[] = {
  65        ICPU(INTEL_FAM6_ATOM_PENWELL),
  66        ICPU(INTEL_FAM6_ATOM_MERRIFIELD),
  67        {}
  68};
  69
  70static int __init mid_pci_init(void)
  71{
  72        const struct x86_cpu_id *id;
  73
  74        id = x86_match_cpu(lpss_cpu_ids);
  75        if (id)
  76                pci_set_platform_pm(&mid_pci_platform_pm);
  77        return 0;
  78}
  79arch_initcall(mid_pci_init);
  80