drivers/pwm/pwm-lpss-pci.c

   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");