/* * 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");