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 }; 40 41 static int pwm_lpss_probe_pci(struct pci_dev *pdev, 42 const struct pci_device_id *id) 43 { 44 const struct pwm_lpss_boardinfo *info; 45 struct pwm_lpss_chip *lpwm; 46 int err; 47 48 err = pcim_enable_device(pdev); 49 if (err < 0) 50 return err; 51 52 info = (struct pwm_lpss_boardinfo *)id->driver_data; 53 lpwm = pwm_lpss_probe(&pdev->dev, &pdev->resource[0], info); 54 if (IS_ERR(lpwm)) 55 return PTR_ERR(lpwm); 56 57 pci_set_drvdata(pdev, lpwm); 58 59 pm_runtime_put(&pdev->dev); 60 pm_runtime_allow(&pdev->dev); 61 62 return 0; 63 } 64 65 static void pwm_lpss_remove_pci(struct pci_dev *pdev) 66 { 67 struct pwm_lpss_chip *lpwm = pci_get_drvdata(pdev); 68 69 pm_runtime_forbid(&pdev->dev); 70 pm_runtime_get_sync(&pdev->dev); 71 72 pwm_lpss_remove(lpwm); 73 } 74 75 #ifdef CONFIG_PM 76 static int pwm_lpss_runtime_suspend_pci(struct device *dev) 77 { 78 /* 79 * The PCI core will handle transition to D3 automatically. We only 80 * need to provide runtime PM hooks for that to happen. 81 */ 82 return 0; 83 } 84 85 static int pwm_lpss_runtime_resume_pci(struct device *dev) 86 { 87 return 0; 88 } 89 #endif 90 91 static const struct dev_pm_ops pwm_lpss_pci_pm = { 92 SET_RUNTIME_PM_OPS(pwm_lpss_runtime_suspend_pci, 93 pwm_lpss_runtime_resume_pci, NULL) 94 }; 95 96 static const struct pci_device_id pwm_lpss_pci_ids[] = { 97 { PCI_VDEVICE(INTEL, 0x0ac8), (unsigned long)&pwm_lpss_bxt_info}, 98 { PCI_VDEVICE(INTEL, 0x0f08), (unsigned long)&pwm_lpss_byt_info}, 99 { PCI_VDEVICE(INTEL, 0x0f09), (unsigned long)&pwm_lpss_byt_info}, 100 { PCI_VDEVICE(INTEL, 0x11a5), (unsigned long)&pwm_lpss_bxt_info}, 101 { PCI_VDEVICE(INTEL, 0x1ac8), (unsigned long)&pwm_lpss_bxt_info}, 102 { PCI_VDEVICE(INTEL, 0x2288), (unsigned long)&pwm_lpss_bsw_info}, 103 { PCI_VDEVICE(INTEL, 0x2289), (unsigned long)&pwm_lpss_bsw_info}, 104 { PCI_VDEVICE(INTEL, 0x31c8), (unsigned long)&pwm_lpss_bxt_info}, 105 { PCI_VDEVICE(INTEL, 0x5ac8), (unsigned long)&pwm_lpss_bxt_info}, 106 { }, 107 }; 108 MODULE_DEVICE_TABLE(pci, pwm_lpss_pci_ids); 109 110 static struct pci_driver pwm_lpss_driver_pci = { 111 .name = "pwm-lpss", 112 .id_table = pwm_lpss_pci_ids, 113 .probe = pwm_lpss_probe_pci, 114 .remove = pwm_lpss_remove_pci, 115 .driver = { 116 .pm = &pwm_lpss_pci_pm, 117 }, 118 }; 119 module_pci_driver(pwm_lpss_driver_pci); 120 121 MODULE_DESCRIPTION("PWM PCI driver for Intel LPSS"); 122 MODULE_LICENSE("GPL v2"); 123