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 */
18 static 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 */
25 static 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 */
32 static 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 */
40 static const struct pwm_lpss_boardinfo pwm_lpss_tng_info = {
41 .clk_rate = 19200000,
42 .npwm = 4,
43 .base_unit_bits = 22,
44 };
45
pwm_lpss_probe_pci(struct pci_dev * pdev,const struct pci_device_id * id)46 static 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
pwm_lpss_remove_pci(struct pci_dev * pdev)70 static 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
pwm_lpss_runtime_suspend_pci(struct device * dev)81 static 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
pwm_lpss_runtime_resume_pci(struct device * dev)90 static int pwm_lpss_runtime_resume_pci(struct device *dev)
91 {
92 return 0;
93 }
94 #endif
95
96 static 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
101 static 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 };
113 MODULE_DEVICE_TABLE(pci, pwm_lpss_pci_ids);
114
115 static 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 };
124 module_pci_driver(pwm_lpss_driver_pci);
125
126 MODULE_DESCRIPTION("PWM PCI driver for Intel LPSS");
127 MODULE_LICENSE("GPL v2");
128