xref: /openbmc/linux/drivers/pwm/pwm-lpss-pci.c (revision f7c35abe)
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 };
40 
41 static int pwm_lpss_probe_pci(struct pci_dev *pdev,
42 			      const struct pci_device_id *id)
43 {
44 	const struct pwm_lpss_boardinfo *info;
45 	struct pwm_lpss_chip *lpwm;
46 	int err;
47 
48 	err = pcim_enable_device(pdev);
49 	if (err < 0)
50 		return err;
51 
52 	info = (struct pwm_lpss_boardinfo *)id->driver_data;
53 	lpwm = pwm_lpss_probe(&pdev->dev, &pdev->resource[0], info);
54 	if (IS_ERR(lpwm))
55 		return PTR_ERR(lpwm);
56 
57 	pci_set_drvdata(pdev, lpwm);
58 
59 	pm_runtime_put(&pdev->dev);
60 	pm_runtime_allow(&pdev->dev);
61 
62 	return 0;
63 }
64 
65 static void pwm_lpss_remove_pci(struct pci_dev *pdev)
66 {
67 	struct pwm_lpss_chip *lpwm = pci_get_drvdata(pdev);
68 
69 	pm_runtime_forbid(&pdev->dev);
70 	pm_runtime_get_sync(&pdev->dev);
71 
72 	pwm_lpss_remove(lpwm);
73 }
74 
75 #ifdef CONFIG_PM
76 static int pwm_lpss_runtime_suspend_pci(struct device *dev)
77 {
78 	/*
79 	 * The PCI core will handle transition to D3 automatically. We only
80 	 * need to provide runtime PM hooks for that to happen.
81 	 */
82 	return 0;
83 }
84 
85 static int pwm_lpss_runtime_resume_pci(struct device *dev)
86 {
87 	return 0;
88 }
89 #endif
90 
91 static const struct dev_pm_ops pwm_lpss_pci_pm = {
92 	SET_RUNTIME_PM_OPS(pwm_lpss_runtime_suspend_pci,
93 			   pwm_lpss_runtime_resume_pci, NULL)
94 };
95 
96 static const struct pci_device_id pwm_lpss_pci_ids[] = {
97 	{ PCI_VDEVICE(INTEL, 0x0ac8), (unsigned long)&pwm_lpss_bxt_info},
98 	{ PCI_VDEVICE(INTEL, 0x0f08), (unsigned long)&pwm_lpss_byt_info},
99 	{ PCI_VDEVICE(INTEL, 0x0f09), (unsigned long)&pwm_lpss_byt_info},
100 	{ PCI_VDEVICE(INTEL, 0x11a5), (unsigned long)&pwm_lpss_bxt_info},
101 	{ PCI_VDEVICE(INTEL, 0x1ac8), (unsigned long)&pwm_lpss_bxt_info},
102 	{ PCI_VDEVICE(INTEL, 0x2288), (unsigned long)&pwm_lpss_bsw_info},
103 	{ PCI_VDEVICE(INTEL, 0x2289), (unsigned long)&pwm_lpss_bsw_info},
104 	{ PCI_VDEVICE(INTEL, 0x31c8), (unsigned long)&pwm_lpss_bxt_info},
105 	{ PCI_VDEVICE(INTEL, 0x5ac8), (unsigned long)&pwm_lpss_bxt_info},
106 	{ },
107 };
108 MODULE_DEVICE_TABLE(pci, pwm_lpss_pci_ids);
109 
110 static struct pci_driver pwm_lpss_driver_pci = {
111 	.name = "pwm-lpss",
112 	.id_table = pwm_lpss_pci_ids,
113 	.probe = pwm_lpss_probe_pci,
114 	.remove = pwm_lpss_remove_pci,
115 	.driver = {
116 		.pm = &pwm_lpss_pci_pm,
117 	},
118 };
119 module_pci_driver(pwm_lpss_driver_pci);
120 
121 MODULE_DESCRIPTION("PWM PCI driver for Intel LPSS");
122 MODULE_LICENSE("GPL v2");
123