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
  19 static bool mid_pci_power_manageable(struct pci_dev *dev)
  20 {
  21         return true;
  22 }
  23
  24 static 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
  29 static pci_power_t mid_pci_get_power_state(struct pci_dev *pdev)
  30 {
  31         return intel_mid_pci_get_power_state(pdev);
  32 }
  33
  34 static pci_power_t mid_pci_choose_state(struct pci_dev *pdev)
  35 {
  36         return PCI_D3hot;
  37 }
  38
  39 static int mid_pci_wakeup(struct pci_dev *dev, bool enable)
  40 {
  41         return 0;
  42 }
  43
  44 static bool mid_pci_need_resume(struct pci_dev *dev)
  45 {
  46         return false;
  47 }
  48
  49 static 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  */
  64 static const struct x86_cpu_id lpss_cpu_ids[] = {
  65         ICPU(INTEL_FAM6_ATOM_SALTWELL_MID),
  66         ICPU(INTEL_FAM6_ATOM_SILVERMONT_MID),
  67         {}
  68 };
  69
  70 static 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 }
  79 arch_initcall(mid_pci_init);