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