linux/drivers/pwm/pwm-lpss-pci.c
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   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 */
  18static 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 */
  25static 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 */
  32static 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 */
  40static const struct pwm_lpss_boardinfo pwm_lpss_tng_info = {
  41        .clk_rate = 19200000,
  42        .npwm = 4,
  43        .base_unit_bits = 22,
  44};
  45
  46static 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
  70static 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
  77static 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
  86static int pwm_lpss_runtime_resume_pci(struct device *dev)
  87{
  88        return 0;
  89}
  90#endif
  91
  92static 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
  97static 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};
 109MODULE_DEVICE_TABLE(pci, pwm_lpss_pci_ids);
 110
 111static 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};
 120module_pci_driver(pwm_lpss_driver_pci);
 121
 122MODULE_DESCRIPTION("PWM PCI driver for Intel LPSS");
 123MODULE_LICENSE("GPL v2");
 124