Merge remote-tracking branch 'stable/linux-5.15.y' into rpi-5.15.y
[platform/kernel/linux-rpi.git] / 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 /*
59  * This table should be in sync with the one in
60  * arch/x86/platform/intel-mid/pwr.c.
61  */
62 static const struct x86_cpu_id lpss_cpu_ids[] = {
63         X86_MATCH_INTEL_FAM6_MODEL(ATOM_SALTWELL_MID, NULL),
64         X86_MATCH_INTEL_FAM6_MODEL(ATOM_SILVERMONT_MID, NULL),
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);