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