1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Intel Low Power Subsystem PWM controller PCI driver 4 * 5 * Copyright (C) 2014, Intel Corporation 6 * 7 * Derived from the original pwm-lpss.c 8 */ 9 10 #include <linux/kernel.h> 11 #include <linux/module.h> 12 #include <linux/pci.h> 13 #include <linux/pm_runtime.h> 14 15 #include "pwm-lpss.h" 16 17 /* BayTrail */ 18 static const struct pwm_lpss_boardinfo pwm_lpss_byt_info = { 19 .clk_rate = 25000000, 20 .npwm = 1, 21 .base_unit_bits = 16, 22 }; 23 24 /* Braswell */ 25 static const struct pwm_lpss_boardinfo pwm_lpss_bsw_info = { 26 .clk_rate = 19200000, 27 .npwm = 1, 28 .base_unit_bits = 16, 29 }; 30 31 /* Broxton */ 32 static const struct pwm_lpss_boardinfo pwm_lpss_bxt_info = { 33 .clk_rate = 19200000, 34 .npwm = 4, 35 .base_unit_bits = 22, 36 .bypass = true, 37 }; 38 39 /* Tangier */ 40 static const struct pwm_lpss_boardinfo pwm_lpss_tng_info = { 41 .clk_rate = 19200000, 42 .npwm = 4, 43 .base_unit_bits = 22, 44 }; 45 46 static int pwm_lpss_probe_pci(struct pci_dev *pdev, 47 const struct pci_device_id *id) 48 { 49 const struct pwm_lpss_boardinfo *info; 50 struct pwm_lpss_chip *lpwm; 51 int err; 52 53 err = pcim_enable_device(pdev); 54 if (err < 0) 55 return err; 56 57 info = (struct pwm_lpss_boardinfo *)id->driver_data; 58 lpwm = pwm_lpss_probe(&pdev->dev, &pdev->resource[0], info); 59 if (IS_ERR(lpwm)) 60 return PTR_ERR(lpwm); 61 62 pci_set_drvdata(pdev, lpwm); 63 64 pm_runtime_put(&pdev->dev); 65 pm_runtime_allow(&pdev->dev); 66 67 return 0; 68 } 69 70 static void pwm_lpss_remove_pci(struct pci_dev *pdev) 71 { 72 struct pwm_lpss_chip *lpwm = pci_get_drvdata(pdev); 73 74 pm_runtime_forbid(&pdev->dev); 75 pm_runtime_get_sync(&pdev->dev); 76 77 pwm_lpss_remove(lpwm); 78 } 79 80 #ifdef CONFIG_PM 81 static int pwm_lpss_runtime_suspend_pci(struct device *dev) 82 { 83 /* 84 * The PCI core will handle transition to D3 automatically. We only 85 * need to provide runtime PM hooks for that to happen. 86 */ 87 return 0; 88 } 89 90 static int pwm_lpss_runtime_resume_pci(struct device *dev) 91 { 92 return 0; 93 } 94 #endif 95 96 static const struct dev_pm_ops pwm_lpss_pci_pm = { 97 SET_RUNTIME_PM_OPS(pwm_lpss_runtime_suspend_pci, 98 pwm_lpss_runtime_resume_pci, NULL) 99 }; 100 101 static const struct pci_device_id pwm_lpss_pci_ids[] = { 102 { PCI_VDEVICE(INTEL, 0x0ac8), (unsigned long)&pwm_lpss_bxt_info}, 103 { PCI_VDEVICE(INTEL, 0x0f08), (unsigned long)&pwm_lpss_byt_info}, 104 { PCI_VDEVICE(INTEL, 0x0f09), (unsigned long)&pwm_lpss_byt_info}, 105 { PCI_VDEVICE(INTEL, 0x11a5), (unsigned long)&pwm_lpss_tng_info}, 106 { PCI_VDEVICE(INTEL, 0x1ac8), (unsigned long)&pwm_lpss_bxt_info}, 107 { PCI_VDEVICE(INTEL, 0x2288), (unsigned long)&pwm_lpss_bsw_info}, 108 { PCI_VDEVICE(INTEL, 0x2289), (unsigned long)&pwm_lpss_bsw_info}, 109 { PCI_VDEVICE(INTEL, 0x31c8), (unsigned long)&pwm_lpss_bxt_info}, 110 { PCI_VDEVICE(INTEL, 0x5ac8), (unsigned long)&pwm_lpss_bxt_info}, 111 { }, 112 }; 113 MODULE_DEVICE_TABLE(pci, pwm_lpss_pci_ids); 114 115 static struct pci_driver pwm_lpss_driver_pci = { 116 .name = "pwm-lpss", 117 .id_table = pwm_lpss_pci_ids, 118 .probe = pwm_lpss_probe_pci, 119 .remove = pwm_lpss_remove_pci, 120 .driver = { 121 .pm = &pwm_lpss_pci_pm, 122 }, 123 }; 124 module_pci_driver(pwm_lpss_driver_pci); 125 126 MODULE_DESCRIPTION("PWM PCI driver for Intel LPSS"); 127 MODULE_LICENSE("GPL v2"); 128