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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Intel Low Power Subsystem PWM controller driver
4 *
5 * Copyright (C) 2014, Intel Corporation
6 *
7 * Derived from the original pwm-lpss.c
8 */
9
10#include <linux/acpi.h>
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/platform_device.h>
14#include <linux/pm_runtime.h>
15
16#include "pwm-lpss.h"
17
18/* BayTrail */
19static const struct pwm_lpss_boardinfo pwm_lpss_byt_info = {
20 .clk_rate = 25000000,
21 .npwm = 1,
22 .base_unit_bits = 16,
23};
24
25/* Braswell */
26static const struct pwm_lpss_boardinfo pwm_lpss_bsw_info = {
27 .clk_rate = 19200000,
28 .npwm = 1,
29 .base_unit_bits = 16,
30 .other_devices_aml_touches_pwm_regs = true,
31};
32
33/* Broxton */
34static const struct pwm_lpss_boardinfo pwm_lpss_bxt_info = {
35 .clk_rate = 19200000,
36 .npwm = 4,
37 .base_unit_bits = 22,
38 .bypass = true,
39};
40
41static int pwm_lpss_probe_platform(struct platform_device *pdev)
42{
43 const struct pwm_lpss_boardinfo *info;
44 const struct acpi_device_id *id;
45 struct pwm_lpss_chip *lpwm;
46 struct resource *r;
47
48 id = acpi_match_device(pdev->dev.driver->acpi_match_table, &pdev->dev);
49 if (!id)
50 return -ENODEV;
51
52 info = (const struct pwm_lpss_boardinfo *)id->driver_data;
53 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
54
55 lpwm = pwm_lpss_probe(&pdev->dev, r, info);
56 if (IS_ERR(lpwm))
57 return PTR_ERR(lpwm);
58
59 platform_set_drvdata(pdev, lpwm);
60
61 dev_pm_set_driver_flags(&pdev->dev, DPM_FLAG_SMART_PREPARE);
62 pm_runtime_set_active(&pdev->dev);
63 pm_runtime_enable(&pdev->dev);
64
65 return 0;
66}
67
68static int pwm_lpss_remove_platform(struct platform_device *pdev)
69{
70 struct pwm_lpss_chip *lpwm = platform_get_drvdata(pdev);
71
72 pm_runtime_disable(&pdev->dev);
73 return pwm_lpss_remove(lpwm);
74}
75
76static int pwm_lpss_prepare(struct device *dev)
77{
78 struct pwm_lpss_chip *lpwm = dev_get_drvdata(dev);
79
80 /*
81 * If other device's AML code touches the PWM regs on suspend/resume
82 * force runtime-resume the PWM controller to allow this.
83 */
84 if (lpwm->info->other_devices_aml_touches_pwm_regs)
85 return 0; /* Force runtime-resume */
86
87 return 1; /* If runtime-suspended leave as is */
88}
89
90static const struct dev_pm_ops pwm_lpss_platform_pm_ops = {
91 .prepare = pwm_lpss_prepare,
92 SET_SYSTEM_SLEEP_PM_OPS(pwm_lpss_suspend, pwm_lpss_resume)
93};
94
95static const struct acpi_device_id pwm_lpss_acpi_match[] = {
96 { "80860F09", (unsigned long)&pwm_lpss_byt_info },
97 { "80862288", (unsigned long)&pwm_lpss_bsw_info },
98 { "80862289", (unsigned long)&pwm_lpss_bsw_info },
99 { "80865AC8", (unsigned long)&pwm_lpss_bxt_info },
100 { },
101};
102MODULE_DEVICE_TABLE(acpi, pwm_lpss_acpi_match);
103
104static struct platform_driver pwm_lpss_driver_platform = {
105 .driver = {
106 .name = "pwm-lpss",
107 .acpi_match_table = pwm_lpss_acpi_match,
108 .pm = &pwm_lpss_platform_pm_ops,
109 },
110 .probe = pwm_lpss_probe_platform,
111 .remove = pwm_lpss_remove_platform,
112};
113module_platform_driver(pwm_lpss_driver_platform);
114
115MODULE_DESCRIPTION("PWM platform driver for Intel LPSS");
116MODULE_LICENSE("GPL v2");
117MODULE_ALIAS("platform:pwm-lpss");
1/*
2 * Intel Low Power Subsystem PWM controller 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/acpi.h>
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/platform_device.h>
17#include <linux/pm_runtime.h>
18
19#include "pwm-lpss.h"
20
21/* BayTrail */
22static const struct pwm_lpss_boardinfo pwm_lpss_byt_info = {
23 .clk_rate = 25000000,
24 .npwm = 1,
25 .base_unit_bits = 16,
26};
27
28/* Braswell */
29static const struct pwm_lpss_boardinfo pwm_lpss_bsw_info = {
30 .clk_rate = 19200000,
31 .npwm = 1,
32 .base_unit_bits = 16,
33};
34
35/* Broxton */
36static const struct pwm_lpss_boardinfo pwm_lpss_bxt_info = {
37 .clk_rate = 19200000,
38 .npwm = 4,
39 .base_unit_bits = 22,
40 .bypass = true,
41};
42
43static int pwm_lpss_probe_platform(struct platform_device *pdev)
44{
45 const struct pwm_lpss_boardinfo *info;
46 const struct acpi_device_id *id;
47 struct pwm_lpss_chip *lpwm;
48 struct resource *r;
49
50 id = acpi_match_device(pdev->dev.driver->acpi_match_table, &pdev->dev);
51 if (!id)
52 return -ENODEV;
53
54 info = (const struct pwm_lpss_boardinfo *)id->driver_data;
55 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
56
57 lpwm = pwm_lpss_probe(&pdev->dev, r, info);
58 if (IS_ERR(lpwm))
59 return PTR_ERR(lpwm);
60
61 platform_set_drvdata(pdev, lpwm);
62
63 pm_runtime_set_active(&pdev->dev);
64 pm_runtime_enable(&pdev->dev);
65
66 return 0;
67}
68
69static int pwm_lpss_remove_platform(struct platform_device *pdev)
70{
71 struct pwm_lpss_chip *lpwm = platform_get_drvdata(pdev);
72
73 pm_runtime_disable(&pdev->dev);
74 return pwm_lpss_remove(lpwm);
75}
76
77static const struct acpi_device_id pwm_lpss_acpi_match[] = {
78 { "80860F09", (unsigned long)&pwm_lpss_byt_info },
79 { "80862288", (unsigned long)&pwm_lpss_bsw_info },
80 { "80865AC8", (unsigned long)&pwm_lpss_bxt_info },
81 { },
82};
83MODULE_DEVICE_TABLE(acpi, pwm_lpss_acpi_match);
84
85static struct platform_driver pwm_lpss_driver_platform = {
86 .driver = {
87 .name = "pwm-lpss",
88 .acpi_match_table = pwm_lpss_acpi_match,
89 },
90 .probe = pwm_lpss_probe_platform,
91 .remove = pwm_lpss_remove_platform,
92};
93module_platform_driver(pwm_lpss_driver_platform);
94
95MODULE_DESCRIPTION("PWM platform driver for Intel LPSS");
96MODULE_LICENSE("GPL v2");
97MODULE_ALIAS("platform:pwm-lpss");