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