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	struct pwm_lpss_chip *lpwm = pci_get_drvdata(pdev);
73
74	pm_runtime_forbid(&pdev->dev);
75	pm_runtime_get_sync(&pdev->dev);
76
77	pwm_lpss_remove(lpwm);
78}
79
80#ifdef CONFIG_PM
81static int pwm_lpss_runtime_suspend_pci(struct device *dev)
82{
83	/*
84	 * The PCI core will handle transition to D3 automatically. We only
85	 * need to provide runtime PM hooks for that to happen.
86	 */
87	return 0;
88}
89
90static int pwm_lpss_runtime_resume_pci(struct device *dev)
91{
92	return 0;
93}
94#endif
95
96static const struct dev_pm_ops pwm_lpss_pci_pm = {
97	SET_RUNTIME_PM_OPS(pwm_lpss_runtime_suspend_pci,
98			   pwm_lpss_runtime_resume_pci, NULL)
99};
100
101static const struct pci_device_id pwm_lpss_pci_ids[] = {
102	{ PCI_VDEVICE(INTEL, 0x0ac8), (unsigned long)&pwm_lpss_bxt_info},
103	{ PCI_VDEVICE(INTEL, 0x0f08), (unsigned long)&pwm_lpss_byt_info},
104	{ PCI_VDEVICE(INTEL, 0x0f09), (unsigned long)&pwm_lpss_byt_info},
105	{ PCI_VDEVICE(INTEL, 0x11a5), (unsigned long)&pwm_lpss_tng_info},
106	{ PCI_VDEVICE(INTEL, 0x1ac8), (unsigned long)&pwm_lpss_bxt_info},
107	{ PCI_VDEVICE(INTEL, 0x2288), (unsigned long)&pwm_lpss_bsw_info},
108	{ PCI_VDEVICE(INTEL, 0x2289), (unsigned long)&pwm_lpss_bsw_info},
109	{ PCI_VDEVICE(INTEL, 0x31c8), (unsigned long)&pwm_lpss_bxt_info},
110	{ PCI_VDEVICE(INTEL, 0x5ac8), (unsigned long)&pwm_lpss_bxt_info},
111	{ },
112};
113MODULE_DEVICE_TABLE(pci, pwm_lpss_pci_ids);
114
115static struct pci_driver pwm_lpss_driver_pci = {
116	.name = "pwm-lpss",
117	.id_table = pwm_lpss_pci_ids,
118	.probe = pwm_lpss_probe_pci,
119	.remove = pwm_lpss_remove_pci,
120	.driver = {
121		.pm = &pwm_lpss_pci_pm,
122	},
123};
124module_pci_driver(pwm_lpss_driver_pci);
125
126MODULE_DESCRIPTION("PWM PCI driver for Intel LPSS");
127MODULE_LICENSE("GPL v2");
128