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  
pci_use_mid_pm(void)21  bool pci_use_mid_pm(void)
22  {
23  	return pci_mid_pm_enabled;
24  }
25  
mid_pci_set_power_state(struct pci_dev * pdev,pci_power_t state)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  
mid_pci_get_power_state(struct pci_dev * pdev)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  
mid_pci_init(void)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);
57