mirror of https://gitee.com/openkylin/linux.git
134 lines
3.3 KiB
C
134 lines
3.3 KiB
C
/*
|
|
* TI PWM Subsystem driver
|
|
*
|
|
* Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/io.h>
|
|
#include <linux/err.h>
|
|
#include <linux/pm_runtime.h>
|
|
#include <linux/of_device.h>
|
|
|
|
#include "pwm-tipwmss.h"
|
|
|
|
#define PWMSS_CLKCONFIG 0x8 /* Clock gating reg */
|
|
#define PWMSS_CLKSTATUS 0xc /* Clock gating status reg */
|
|
|
|
struct pwmss_info {
|
|
void __iomem *mmio_base;
|
|
struct mutex pwmss_lock;
|
|
u16 pwmss_clkconfig;
|
|
};
|
|
|
|
u16 pwmss_submodule_state_change(struct device *dev, int set)
|
|
{
|
|
struct pwmss_info *info = dev_get_drvdata(dev);
|
|
u16 val;
|
|
|
|
mutex_lock(&info->pwmss_lock);
|
|
val = readw(info->mmio_base + PWMSS_CLKCONFIG);
|
|
val |= set;
|
|
writew(val , info->mmio_base + PWMSS_CLKCONFIG);
|
|
mutex_unlock(&info->pwmss_lock);
|
|
|
|
return readw(info->mmio_base + PWMSS_CLKSTATUS);
|
|
}
|
|
EXPORT_SYMBOL(pwmss_submodule_state_change);
|
|
|
|
static const struct of_device_id pwmss_of_match[] = {
|
|
{ .compatible = "ti,am33xx-pwmss" },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, pwmss_of_match);
|
|
|
|
static int pwmss_probe(struct platform_device *pdev)
|
|
{
|
|
int ret;
|
|
struct resource *r;
|
|
struct pwmss_info *info;
|
|
struct device_node *node = pdev->dev.of_node;
|
|
|
|
info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
|
|
if (!info)
|
|
return -ENOMEM;
|
|
|
|
mutex_init(&info->pwmss_lock);
|
|
|
|
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
info->mmio_base = devm_ioremap_resource(&pdev->dev, r);
|
|
if (IS_ERR(info->mmio_base))
|
|
return PTR_ERR(info->mmio_base);
|
|
|
|
pm_runtime_enable(&pdev->dev);
|
|
pm_runtime_get_sync(&pdev->dev);
|
|
platform_set_drvdata(pdev, info);
|
|
|
|
/* Populate all the child nodes here... */
|
|
ret = of_platform_populate(node, NULL, NULL, &pdev->dev);
|
|
if (ret)
|
|
dev_err(&pdev->dev, "no child node found\n");
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int pwmss_remove(struct platform_device *pdev)
|
|
{
|
|
struct pwmss_info *info = platform_get_drvdata(pdev);
|
|
|
|
pm_runtime_put_sync(&pdev->dev);
|
|
pm_runtime_disable(&pdev->dev);
|
|
mutex_destroy(&info->pwmss_lock);
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int pwmss_suspend(struct device *dev)
|
|
{
|
|
struct pwmss_info *info = dev_get_drvdata(dev);
|
|
|
|
info->pwmss_clkconfig = readw(info->mmio_base + PWMSS_CLKCONFIG);
|
|
pm_runtime_put_sync(dev);
|
|
return 0;
|
|
}
|
|
|
|
static int pwmss_resume(struct device *dev)
|
|
{
|
|
struct pwmss_info *info = dev_get_drvdata(dev);
|
|
|
|
pm_runtime_get_sync(dev);
|
|
writew(info->pwmss_clkconfig, info->mmio_base + PWMSS_CLKCONFIG);
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static SIMPLE_DEV_PM_OPS(pwmss_pm_ops, pwmss_suspend, pwmss_resume);
|
|
|
|
static struct platform_driver pwmss_driver = {
|
|
.driver = {
|
|
.name = "pwmss",
|
|
.pm = &pwmss_pm_ops,
|
|
.of_match_table = pwmss_of_match,
|
|
},
|
|
.probe = pwmss_probe,
|
|
.remove = pwmss_remove,
|
|
};
|
|
|
|
module_platform_driver(pwmss_driver);
|
|
|
|
MODULE_DESCRIPTION("PWM Subsystem driver");
|
|
MODULE_AUTHOR("Texas Instruments");
|
|
MODULE_LICENSE("GPL");
|