tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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");