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 pci_mid_pm_enabled __read_mostly;
  20
  21 bool pci_use_mid_pm(void)
  22 {
  23         return pci_mid_pm_enabled;
  24 }
  25
  26 int mid_pci_set_power_state(struct pci_dev *pdev, pci_power_t state)
  27 {
  28         return intel_mid_pci_set_power_state(pdev, state);
  29 }
  30
  31 pci_power_t mid_pci_get_power_state(struct pci_dev *pdev)
  32 {
  33         return intel_mid_pci_get_power_state(pdev);
  34 }
  35
  36 /*
  37  * This table should be in sync with the one in
  38  * arch/x86/platform/intel-mid/pwr.c.
  39  */
  40 static const struct x86_cpu_id lpss_cpu_ids[] = {
  41         X86_MATCH_VFM(INTEL_ATOM_SALTWELL_MID, NULL),
  42         X86_MATCH_VFM(INTEL_ATOM_SILVERMONT_MID, NULL),
  43         {}
  44 };
  45
  46 static int __init mid_pci_init(void)
  47 {
  48         const struct x86_cpu_id *id;
  49
  50         id = x86_match_cpu(lpss_cpu_ids);
  51         if (id)
  52                 pci_mid_pm_enabled = true;
  53
  54         return 0;
  55 }
  56 arch_initcall(mid_pci_init);