drivers/pci/pci-mid.c

   1 /*
   2  * Intel MID platform PM support
   3  *
   4  * Copyright (C) 2016, Intel Corporation
   5  *
   6  * Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms and conditions of the GNU General Public License,
  10  * version 2, as published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/init.h>
  14 #include <linux/pci.h>
  15
  16 #include <asm/cpu_device_id.h>
  17 #include <asm/intel-family.h>
  18 #include <asm/intel-mid.h>
  19
  20 #include "pci.h"
  21
  22 static bool mid_pci_power_manageable(struct pci_dev *dev)
  23 {
  24         return true;
  25 }
  26
  27 static int mid_pci_set_power_state(struct pci_dev *pdev, pci_power_t state)
  28 {
  29         return intel_mid_pci_set_power_state(pdev, state);
  30 }
  31
  32 static pci_power_t mid_pci_choose_state(struct pci_dev *pdev)
  33 {
  34         return PCI_D3hot;
  35 }
  36
  37 static int mid_pci_sleep_wake(struct pci_dev *dev, bool enable)
  38 {
  39         return 0;
  40 }
  41
  42 static int mid_pci_run_wake(struct pci_dev *dev, bool enable)
  43 {
  44         return 0;
  45 }
  46
  47 static bool mid_pci_need_resume(struct pci_dev *dev)
  48 {
  49         return false;
  50 }
  51
  52 static struct pci_platform_pm_ops mid_pci_platform_pm = {
  53         .is_manageable  = mid_pci_power_manageable,
  54         .set_state      = mid_pci_set_power_state,
  55         .choose_state   = mid_pci_choose_state,
  56         .sleep_wake     = mid_pci_sleep_wake,
  57         .run_wake       = mid_pci_run_wake,
  58         .need_resume    = mid_pci_need_resume,
  59 };
  60
  61 #define ICPU(model)     { X86_VENDOR_INTEL, 6, model, X86_FEATURE_ANY, }
  62
  63 static const struct x86_cpu_id lpss_cpu_ids[] = {
  64         ICPU(INTEL_FAM6_ATOM_MERRIFIELD),
  65         {}
  66 };
  67
  68 static int __init mid_pci_init(void)
  69 {
  70         const struct x86_cpu_id *id;
  71
  72         id = x86_match_cpu(lpss_cpu_ids);
  73         if (id)
  74                 pci_set_platform_pm(&mid_pci_platform_pm);
  75         return 0;
  76 }
  77 arch_initcall(mid_pci_init);