1 /* 2 * Intel Low Power Subsystem PWM controller PCI driver 3 * 4 * Copyright (C) 2014, Intel Corporation 5 * 6 * Derived from the original pwm-lpss.c 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 */ 12 13 #include <linux/kernel.h> 14 #include <linux/module.h> 15 #include <linux/pci.h> 16 #include <linux/pm_runtime.h> 17 18 #include "pwm-lpss.h" 19 20 /* BayTrail */ 21 static const struct pwm_lpss_boardinfo pwm_lpss_byt_info = { 22 .clk_rate = 25000000, 23 .npwm = 1, 24 .base_unit_bits = 16, 25 }; 26 27 /* Braswell */ 28 static const struct pwm_lpss_boardinfo pwm_lpss_bsw_info = { 29 .clk_rate = 19200000, 30 .npwm = 1, 31 .base_unit_bits = 16, 32 }; 33 34 /* Broxton */ 35 static const struct pwm_lpss_boardinfo pwm_lpss_bxt_info = { 36 .clk_rate = 19200000, 37 .npwm = 4, 38 .base_unit_bits = 22, 39 .bypass = true, 40 }; 41 42 /* Tangier */ 43 static const struct pwm_lpss_boardinfo pwm_lpss_tng_info = { 44 .clk_rate = 19200000, 45 .npwm = 4, 46 .base_unit_bits = 22, 47 }; 48 49 static int pwm_lpss_probe_pci(struct pci_dev *pdev, 50 const struct pci_device_id *id) 51 { 52 const struct pwm_lpss_boardinfo *info; 53 struct pwm_lpss_chip *lpwm; 54 int err; 55 56 err = pcim_enable_device(pdev); 57 if (err < 0) 58 return err; 59 60 info = (struct pwm_lpss_boardinfo *)id->driver_data; 61 lpwm = pwm_lpss_probe(&pdev->dev, &pdev->resource[0], info); 62 if (IS_ERR(lpwm)) 63 return PTR_ERR(lpwm); 64 65 pci_set_drvdata(pdev, lpwm); 66 67 pm_runtime_put(&pdev->dev); 68 pm_runtime_allow(&pdev->dev); 69 70 return 0; 71 } 72 73 static void pwm_lpss_remove_pci(struct pci_dev *pdev) 74 { 75 struct pwm_lpss_chip *lpwm = pci_get_drvdata(pdev); 76 77 pm_runtime_forbid(&pdev->dev); 78 pm_runtime_get_sync(&pdev->dev); 79 80 pwm_lpss_remove(lpwm); 81 } 82 83 #ifdef CONFIG_PM 84 static int pwm_lpss_runtime_suspend_pci(struct device *dev) 85 { 86 /* 87 * The PCI core will handle transition to D3 automatically. We only 88 * need to provide runtime PM hooks for that to happen. 89 */ 90 return 0; 91 } 92 93 static int pwm_lpss_runtime_resume_pci(struct device *dev) 94 { 95 return 0; 96 } 97 #endif 98 99 static const struct dev_pm_ops pwm_lpss_pci_pm = { 100 SET_RUNTIME_PM_OPS(pwm_lpss_runtime_suspend_pci, 101 pwm_lpss_runtime_resume_pci, NULL) 102 }; 103 104 static const struct pci_device_id pwm_lpss_pci_ids[] = { 105 { PCI_VDEVICE(INTEL, 0x0ac8), (unsigned long)&pwm_lpss_bxt_info}, 106 { PCI_VDEVICE(INTEL, 0x0f08), (unsigned long)&pwm_lpss_byt_info}, 107 { PCI_VDEVICE(INTEL, 0x0f09), (unsigned long)&pwm_lpss_byt_info}, 108 { PCI_VDEVICE(INTEL, 0x11a5), (unsigned long)&pwm_lpss_tng_info}, 109 { PCI_VDEVICE(INTEL, 0x1ac8), (unsigned long)&pwm_lpss_bxt_info}, 110 { PCI_VDEVICE(INTEL, 0x2288), (unsigned long)&pwm_lpss_bsw_info}, 111 { PCI_VDEVICE(INTEL, 0x2289), (unsigned long)&pwm_lpss_bsw_info}, 112 { PCI_VDEVICE(INTEL, 0x31c8), (unsigned long)&pwm_lpss_bxt_info}, 113 { PCI_VDEVICE(INTEL, 0x5ac8), (unsigned long)&pwm_lpss_bxt_info}, 114 { }, 115 }; 116 MODULE_DEVICE_TABLE(pci, pwm_lpss_pci_ids); 117 118 static struct pci_driver pwm_lpss_driver_pci = { 119 .name = "pwm-lpss", 120 .id_table = pwm_lpss_pci_ids, 121 .probe = pwm_lpss_probe_pci, 122 .remove = pwm_lpss_remove_pci, 123 .driver = { 124 .pm = &pwm_lpss_pci_pm, 125 }, 126 }; 127 module_pci_driver(pwm_lpss_driver_pci); 128 129 MODULE_DESCRIPTION("PWM PCI driver for Intel LPSS"); 130 MODULE_LICENSE("GPL v2"); 131