/* * A driver for the RTC embedded in the Cirrus Logic EP93XX processors * Copyright (c) 2006 Tower Technologies * * Author: Alessandro Zummo <a.zummo@towertech.it> * * 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. */ #include <linux/module.h> #include <linux/rtc.h> #include <linux/platform_device.h> #include <linux/io.h> #include <linux/gfp.h> #define EP93XX_RTC_DATA 0x000 #define EP93XX_RTC_MATCH 0x004 #define EP93XX_RTC_STATUS 0x008 #define EP93XX_RTC_STATUS_INTR (1<<0) #define EP93XX_RTC_LOAD 0x00C #define EP93XX_RTC_CONTROL 0x010 #define EP93XX_RTC_CONTROL_MIE (1<<0) #define EP93XX_RTC_SWCOMP 0x108 #define EP93XX_RTC_SWCOMP_DEL_MASK 0x001f0000 #define EP93XX_RTC_SWCOMP_DEL_SHIFT 16 #define EP93XX_RTC_SWCOMP_INT_MASK 0x0000ffff #define EP93XX_RTC_SWCOMP_INT_SHIFT 0 #define DRV_VERSION "0.3" /* * struct device dev.platform_data is used to store our private data * because struct rtc_device does not have a variable to hold it. */ struct ep93xx_rtc { void __iomem *mmio_base; struct rtc_device *rtc; }; static int ep93xx_rtc_get_swcomp(struct device *dev, unsigned short *preload, unsigned short *delete) { struct ep93xx_rtc *ep93xx_rtc = dev->platform_data; unsigned long comp; comp = __raw_readl(ep93xx_rtc->mmio_base + EP93XX_RTC_SWCOMP); if (preload) *preload = (comp & EP93XX_RTC_SWCOMP_INT_MASK) >> EP93XX_RTC_SWCOMP_INT_SHIFT; if (delete) *delete = (comp & EP93XX_RTC_SWCOMP_DEL_MASK) >> EP93XX_RTC_SWCOMP_DEL_SHIFT; return 0; } static int ep93xx_rtc_read_time(struct device *dev, struct rtc_time *tm) { struct ep93xx_rtc *ep93xx_rtc = dev->platform_data; unsigned long time; time = __raw_readl(ep93xx_rtc->mmio_base + EP93XX_RTC_DATA); rtc_time_to_tm(time, tm); return 0; } static int ep93xx_rtc_set_mmss(struct device *dev, unsigned long secs) { struct ep93xx_rtc *ep93xx_rtc = dev->platform_data; __raw_writel(secs + 1, ep93xx_rtc->mmio_base + EP93XX_RTC_LOAD); return 0; } static int ep93xx_rtc_proc(struct device *dev, struct seq_file *seq) { unsigned short preload, delete; ep93xx_rtc_get_swcomp(dev, &preload, &delete); seq_printf(seq, "preload\t\t: %d\n", preload); seq_printf(seq, "delete\t\t: %d\n", delete); return 0; } static const struct rtc_class_ops ep93xx_rtc_ops = { .read_time = ep93xx_rtc_read_time, .set_mmss = ep93xx_rtc_set_mmss, .proc = ep93xx_rtc_proc, }; static ssize_t ep93xx_rtc_show_comp_preload(struct device *dev, struct device_attribute *attr, char *buf) { unsigned short preload; ep93xx_rtc_get_swcomp(dev, &preload, NULL); return sprintf(buf, "%d\n", preload); } static DEVICE_ATTR(comp_preload, S_IRUGO, ep93xx_rtc_show_comp_preload, NULL); static ssize_t ep93xx_rtc_show_comp_delete(struct device *dev, struct device_attribute *attr, char *buf) { unsigned short delete; ep93xx_rtc_get_swcomp(dev, NULL, &delete); return sprintf(buf, "%d\n", delete); } static DEVICE_ATTR(comp_delete, S_IRUGO, ep93xx_rtc_show_comp_delete, NULL); static struct attribute *ep93xx_rtc_attrs[] = { &dev_attr_comp_preload.attr, &dev_attr_comp_delete.attr, NULL }; static const struct attribute_group ep93xx_rtc_sysfs_files = { .attrs = ep93xx_rtc_attrs, }; static int __init ep93xx_rtc_probe(struct platform_device *pdev) { struct ep93xx_rtc *ep93xx_rtc; struct resource *res; int err; ep93xx_rtc = devm_kzalloc(&pdev->dev, sizeof(*ep93xx_rtc), GFP_KERNEL); if (!ep93xx_rtc) return -ENOMEM; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res) return -ENXIO; if (!devm_request_mem_region(&pdev->dev, res->start, resource_size(res), pdev->name)) return -EBUSY; ep93xx_rtc->mmio_base = devm_ioremap(&pdev->dev, res->start, resource_size(res)); if (!ep93xx_rtc->mmio_base) return -ENXIO; pdev->dev.platform_data = ep93xx_rtc; platform_set_drvdata(pdev, ep93xx_rtc); ep93xx_rtc->rtc = rtc_device_register(pdev->name, &pdev->dev, &ep93xx_rtc_ops, THIS_MODULE); if (IS_ERR(ep93xx_rtc->rtc)) { err = PTR_ERR(ep93xx_rtc->rtc); goto exit; } err = sysfs_create_group(&pdev->dev.kobj, &ep93xx_rtc_sysfs_files); if (err) goto fail; return 0; fail: rtc_device_unregister(ep93xx_rtc->rtc); exit: platform_set_drvdata(pdev, NULL); pdev->dev.platform_data = NULL; return err; } static int __exit ep93xx_rtc_remove(struct platform_device *pdev) { struct ep93xx_rtc *ep93xx_rtc = platform_get_drvdata(pdev); sysfs_remove_group(&pdev->dev.kobj, &ep93xx_rtc_sysfs_files); platform_set_drvdata(pdev, NULL); rtc_device_unregister(ep93xx_rtc->rtc); pdev->dev.platform_data = NULL; return 0; } /* work with hotplug and coldplug */ MODULE_ALIAS("platform:ep93xx-rtc"); static struct platform_driver ep93xx_rtc_driver = { .driver = { .name = "ep93xx-rtc", .owner = THIS_MODULE, }, .remove = __exit_p(ep93xx_rtc_remove), }; static int __init ep93xx_rtc_init(void) { return platform_driver_probe(&ep93xx_rtc_driver, ep93xx_rtc_probe); } static void __exit ep93xx_rtc_exit(void) { platform_driver_unregister(&ep93xx_rtc_driver); } MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); MODULE_DESCRIPTION("EP93XX RTC driver"); MODULE_LICENSE("GPL"); MODULE_VERSION(DRV_VERSION); module_init(ep93xx_rtc_init); module_exit(ep93xx_rtc_exit);