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         .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");