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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// 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/kernel.h>
11#include <linux/mod_devicetable.h>
12#include <linux/module.h>
13#include <linux/platform_device.h>
14#include <linux/pm_runtime.h>
15#include <linux/property.h>
16
17#include "pwm-lpss.h"
18
19
20static int pwm_lpss_probe_platform(struct platform_device *pdev)
21{
22 const struct pwm_lpss_boardinfo *info;
23 struct pwm_lpss_chip *lpwm;
24 void __iomem *base;
25
26 info = device_get_match_data(&pdev->dev);
27 if (!info)
28 return -ENODEV;
29
30 base = devm_platform_ioremap_resource(pdev, 0);
31 if (IS_ERR(base))
32 return PTR_ERR(base);
33
34 lpwm = devm_pwm_lpss_probe(&pdev->dev, base, info);
35 if (IS_ERR(lpwm))
36 return PTR_ERR(lpwm);
37
38 platform_set_drvdata(pdev, lpwm);
39
40 /*
41 * On Cherry Trail devices the GFX0._PS0 AML checks if the controller
42 * is on and if it is not on it turns it on and restores what it
43 * believes is the correct state to the PWM controller.
44 * Because of this we must disallow direct-complete, which keeps the
45 * controller (runtime)suspended on resume, to avoid 2 issues:
46 * 1. The controller getting turned on without the linux-pm code
47 * knowing about this. On devices where the controller is unused
48 * this causes it to stay on during the next suspend causing high
49 * battery drain (because S0i3 is not reached)
50 * 2. The state restoring code unexpectedly messing with the controller
51 *
52 * Leaving the controller runtime-suspended (skipping runtime-resume +
53 * normal-suspend) during suspend is fine.
54 */
55 if (info->other_devices_aml_touches_pwm_regs)
56 dev_pm_set_driver_flags(&pdev->dev, DPM_FLAG_NO_DIRECT_COMPLETE|
57 DPM_FLAG_SMART_SUSPEND);
58
59 pm_runtime_set_active(&pdev->dev);
60 pm_runtime_enable(&pdev->dev);
61
62 return 0;
63}
64
65static int pwm_lpss_remove_platform(struct platform_device *pdev)
66{
67 pm_runtime_disable(&pdev->dev);
68 return 0;
69}
70
71static const struct acpi_device_id pwm_lpss_acpi_match[] = {
72 { "80860F09", (unsigned long)&pwm_lpss_byt_info },
73 { "80862288", (unsigned long)&pwm_lpss_bsw_info },
74 { "80862289", (unsigned long)&pwm_lpss_bsw_info },
75 { "80865AC8", (unsigned long)&pwm_lpss_bxt_info },
76 { },
77};
78MODULE_DEVICE_TABLE(acpi, pwm_lpss_acpi_match);
79
80static struct platform_driver pwm_lpss_driver_platform = {
81 .driver = {
82 .name = "pwm-lpss",
83 .acpi_match_table = pwm_lpss_acpi_match,
84 },
85 .probe = pwm_lpss_probe_platform,
86 .remove = pwm_lpss_remove_platform,
87};
88module_platform_driver(pwm_lpss_driver_platform);
89
90MODULE_DESCRIPTION("PWM platform driver for Intel LPSS");
91MODULE_LICENSE("GPL v2");
92MODULE_IMPORT_NS(PWM_LPSS);
93MODULE_ALIAS("platform:pwm-lpss");