d2912cb15b
Based on 2 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation # extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 4122 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
118 lines
2.9 KiB
C
118 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Intel Low Power Subsystem PWM controller driver
|
|
*
|
|
* Copyright (C) 2014, Intel Corporation
|
|
*
|
|
* Derived from the original pwm-lpss.c
|
|
*/
|
|
|
|
#include <linux/acpi.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/pm_runtime.h>
|
|
|
|
#include "pwm-lpss.h"
|
|
|
|
/* BayTrail */
|
|
static const struct pwm_lpss_boardinfo pwm_lpss_byt_info = {
|
|
.clk_rate = 25000000,
|
|
.npwm = 1,
|
|
.base_unit_bits = 16,
|
|
};
|
|
|
|
/* Braswell */
|
|
static const struct pwm_lpss_boardinfo pwm_lpss_bsw_info = {
|
|
.clk_rate = 19200000,
|
|
.npwm = 1,
|
|
.base_unit_bits = 16,
|
|
.other_devices_aml_touches_pwm_regs = true,
|
|
};
|
|
|
|
/* Broxton */
|
|
static const struct pwm_lpss_boardinfo pwm_lpss_bxt_info = {
|
|
.clk_rate = 19200000,
|
|
.npwm = 4,
|
|
.base_unit_bits = 22,
|
|
.bypass = true,
|
|
};
|
|
|
|
static int pwm_lpss_probe_platform(struct platform_device *pdev)
|
|
{
|
|
const struct pwm_lpss_boardinfo *info;
|
|
const struct acpi_device_id *id;
|
|
struct pwm_lpss_chip *lpwm;
|
|
struct resource *r;
|
|
|
|
id = acpi_match_device(pdev->dev.driver->acpi_match_table, &pdev->dev);
|
|
if (!id)
|
|
return -ENODEV;
|
|
|
|
info = (const struct pwm_lpss_boardinfo *)id->driver_data;
|
|
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
|
|
lpwm = pwm_lpss_probe(&pdev->dev, r, info);
|
|
if (IS_ERR(lpwm))
|
|
return PTR_ERR(lpwm);
|
|
|
|
platform_set_drvdata(pdev, lpwm);
|
|
|
|
dev_pm_set_driver_flags(&pdev->dev, DPM_FLAG_SMART_PREPARE);
|
|
pm_runtime_set_active(&pdev->dev);
|
|
pm_runtime_enable(&pdev->dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pwm_lpss_remove_platform(struct platform_device *pdev)
|
|
{
|
|
struct pwm_lpss_chip *lpwm = platform_get_drvdata(pdev);
|
|
|
|
pm_runtime_disable(&pdev->dev);
|
|
return pwm_lpss_remove(lpwm);
|
|
}
|
|
|
|
static int pwm_lpss_prepare(struct device *dev)
|
|
{
|
|
struct pwm_lpss_chip *lpwm = dev_get_drvdata(dev);
|
|
|
|
/*
|
|
* If other device's AML code touches the PWM regs on suspend/resume
|
|
* force runtime-resume the PWM controller to allow this.
|
|
*/
|
|
if (lpwm->info->other_devices_aml_touches_pwm_regs)
|
|
return 0; /* Force runtime-resume */
|
|
|
|
return 1; /* If runtime-suspended leave as is */
|
|
}
|
|
|
|
static const struct dev_pm_ops pwm_lpss_platform_pm_ops = {
|
|
.prepare = pwm_lpss_prepare,
|
|
SET_SYSTEM_SLEEP_PM_OPS(pwm_lpss_suspend, pwm_lpss_resume)
|
|
};
|
|
|
|
static const struct acpi_device_id pwm_lpss_acpi_match[] = {
|
|
{ "80860F09", (unsigned long)&pwm_lpss_byt_info },
|
|
{ "80862288", (unsigned long)&pwm_lpss_bsw_info },
|
|
{ "80862289", (unsigned long)&pwm_lpss_bsw_info },
|
|
{ "80865AC8", (unsigned long)&pwm_lpss_bxt_info },
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(acpi, pwm_lpss_acpi_match);
|
|
|
|
static struct platform_driver pwm_lpss_driver_platform = {
|
|
.driver = {
|
|
.name = "pwm-lpss",
|
|
.acpi_match_table = pwm_lpss_acpi_match,
|
|
.pm = &pwm_lpss_platform_pm_ops,
|
|
},
|
|
.probe = pwm_lpss_probe_platform,
|
|
.remove = pwm_lpss_remove_platform,
|
|
};
|
|
module_platform_driver(pwm_lpss_driver_platform);
|
|
|
|
MODULE_DESCRIPTION("PWM platform driver for Intel LPSS");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_ALIAS("platform:pwm-lpss");
|