1 /* 2 * Intel MID platform PM support 3 * 4 * Copyright (C) 2016, Intel Corporation 5 * 6 * Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com> 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms and conditions of the GNU General Public License, 10 * version 2, as published by the Free Software Foundation. 11 */ 12 13 #include <linux/init.h> 14 #include <linux/pci.h> 15 16 #include <asm/cpu_device_id.h> 17 #include <asm/intel-family.h> 18 #include <asm/intel-mid.h> 19 20 #include "pci.h" 21 22 static bool mid_pci_power_manageable(struct pci_dev *dev) 23 { 24 return true; 25 } 26 27 static int mid_pci_set_power_state(struct pci_dev *pdev, pci_power_t state) 28 { 29 return intel_mid_pci_set_power_state(pdev, state); 30 } 31 32 static pci_power_t mid_pci_get_power_state(struct pci_dev *pdev) 33 { 34 return intel_mid_pci_get_power_state(pdev); 35 } 36 37 static pci_power_t mid_pci_choose_state(struct pci_dev *pdev) 38 { 39 return PCI_D3hot; 40 } 41 42 static int mid_pci_wakeup(struct pci_dev *dev, bool enable) 43 { 44 return 0; 45 } 46 47 static bool mid_pci_need_resume(struct pci_dev *dev) 48 { 49 return false; 50 } 51 52 static const struct pci_platform_pm_ops mid_pci_platform_pm = { 53 .is_manageable = mid_pci_power_manageable, 54 .set_state = mid_pci_set_power_state, 55 .get_state = mid_pci_get_power_state, 56 .choose_state = mid_pci_choose_state, 57 .set_wakeup = mid_pci_wakeup, 58 .need_resume = mid_pci_need_resume, 59 }; 60 61 #define ICPU(model) { X86_VENDOR_INTEL, 6, model, X86_FEATURE_ANY, } 62 63 /* 64 * This table should be in sync with the one in 65 * arch/x86/platform/intel-mid/pwr.c. 66 */ 67 static const struct x86_cpu_id lpss_cpu_ids[] = { 68 ICPU(INTEL_FAM6_ATOM_PENWELL), 69 ICPU(INTEL_FAM6_ATOM_MERRIFIELD), 70 {} 71 }; 72 73 static int __init mid_pci_init(void) 74 { 75 const struct x86_cpu_id *id; 76 77 id = x86_match_cpu(lpss_cpu_ids); 78 if (id) 79 pci_set_platform_pm(&mid_pci_platform_pm); 80 return 0; 81 } 82 arch_initcall(mid_pci_init); 83