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 */
 21static 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 */
 28static 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 */
 35static 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 */
 43static const struct pwm_lpss_boardinfo pwm_lpss_tng_info = {
 44	.clk_rate = 19200000,
 45	.npwm = 4,
 46	.base_unit_bits = 22,
 47};
 48
 49static 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
 73static 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
 84static 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
 93static int pwm_lpss_runtime_resume_pci(struct device *dev)
 94{
 95	return 0;
 96}
 97#endif
 98
 99static 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
104static 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};
116MODULE_DEVICE_TABLE(pci, pwm_lpss_pci_ids);
117
118static 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};
127module_pci_driver(pwm_lpss_driver_pci);
128
129MODULE_DESCRIPTION("PWM PCI driver for Intel LPSS");
130MODULE_LICENSE("GPL v2");