drivers/pwm/pwm-lpss-pci.c

   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         pm_runtime_forbid(&pdev->dev);
  73         pm_runtime_get_sync(&pdev->dev);
  74 }
  75
  76 #ifdef CONFIG_PM
  77 static int pwm_lpss_runtime_suspend_pci(struct device *dev)
  78 {
  79         /*
  80          * The PCI core will handle transition to D3 automatically. We only
  81          * need to provide runtime PM hooks for that to happen.
  82          */
  83         return 0;
  84 }
  85
  86 static int pwm_lpss_runtime_resume_pci(struct device *dev)
  87 {
  88         return 0;
  89 }
  90 #endif
  91
  92 static const struct dev_pm_ops pwm_lpss_pci_pm = {
  93         SET_RUNTIME_PM_OPS(pwm_lpss_runtime_suspend_pci,
  94                            pwm_lpss_runtime_resume_pci, NULL)
  95 };
  96
  97 static const struct pci_device_id pwm_lpss_pci_ids[] = {
  98         { PCI_VDEVICE(INTEL, 0x0ac8), (unsigned long)&pwm_lpss_bxt_info},
  99         { PCI_VDEVICE(INTEL, 0x0f08), (unsigned long)&pwm_lpss_byt_info},
 100         { PCI_VDEVICE(INTEL, 0x0f09), (unsigned long)&pwm_lpss_byt_info},
 101         { PCI_VDEVICE(INTEL, 0x11a5), (unsigned long)&pwm_lpss_tng_info},
 102         { PCI_VDEVICE(INTEL, 0x1ac8), (unsigned long)&pwm_lpss_bxt_info},
 103         { PCI_VDEVICE(INTEL, 0x2288), (unsigned long)&pwm_lpss_bsw_info},
 104         { PCI_VDEVICE(INTEL, 0x2289), (unsigned long)&pwm_lpss_bsw_info},
 105         { PCI_VDEVICE(INTEL, 0x31c8), (unsigned long)&pwm_lpss_bxt_info},
 106         { PCI_VDEVICE(INTEL, 0x5ac8), (unsigned long)&pwm_lpss_bxt_info},
 107         { },
 108 };
 109 MODULE_DEVICE_TABLE(pci, pwm_lpss_pci_ids);
 110
 111 static struct pci_driver pwm_lpss_driver_pci = {
 112         .name = "pwm-lpss",
 113         .id_table = pwm_lpss_pci_ids,
 114         .probe = pwm_lpss_probe_pci,
 115         .remove = pwm_lpss_remove_pci,
 116         .driver = {
 117                 .pm = &pwm_lpss_pci_pm,
 118         },
 119 };
 120 module_pci_driver(pwm_lpss_driver_pci);
 121
 122 MODULE_DESCRIPTION("PWM PCI driver for Intel LPSS");
 123 MODULE_LICENSE("GPL v2");