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 
mid_pci_power_manageable(struct pci_dev * dev)19 static bool mid_pci_power_manageable(struct pci_dev *dev)
20 {
21 	return true;
22 }
23 
mid_pci_set_power_state(struct pci_dev * pdev,pci_power_t state)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 
mid_pci_get_power_state(struct pci_dev * pdev)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 
mid_pci_choose_state(struct pci_dev * pdev)34 static pci_power_t mid_pci_choose_state(struct pci_dev *pdev)
35 {
36 	return PCI_D3hot;
37 }
38 
mid_pci_wakeup(struct pci_dev * dev,bool enable)39 static int mid_pci_wakeup(struct pci_dev *dev, bool enable)
40 {
41 	return 0;
42 }
43 
mid_pci_need_resume(struct pci_dev * dev)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 #define ICPU(model)	{ X86_VENDOR_INTEL, 6, model, X86_FEATURE_ANY, }
59 
60 /*
61  * This table should be in sync with the one in
62  * arch/x86/platform/intel-mid/pwr.c.
63  */
64 static const struct x86_cpu_id lpss_cpu_ids[] = {
65 	ICPU(INTEL_FAM6_ATOM_SALTWELL_MID),
66 	ICPU(INTEL_FAM6_ATOM_SILVERMONT_MID),
67 	{}
68 };
69 
mid_pci_init(void)70 static int __init mid_pci_init(void)
71 {
72 	const struct x86_cpu_id *id;
73 
74 	id = x86_match_cpu(lpss_cpu_ids);
75 	if (id)
76 		pci_set_platform_pm(&mid_pci_platform_pm);
77 	return 0;
78 }
79 arch_initcall(mid_pci_init);
80