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");

 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");