1fd507e2fSAlessandro Zummo /* 2fd507e2fSAlessandro Zummo * A driver for the RTC embedded in the Cirrus Logic EP93XX processors 3fd507e2fSAlessandro Zummo * Copyright (c) 2006 Tower Technologies 4fd507e2fSAlessandro Zummo * 5fd507e2fSAlessandro Zummo * Author: Alessandro Zummo <a.zummo@towertech.it> 6fd507e2fSAlessandro Zummo * 7fd507e2fSAlessandro Zummo * This program is free software; you can redistribute it and/or modify 8fd507e2fSAlessandro Zummo * it under the terms of the GNU General Public License version 2 as 9fd507e2fSAlessandro Zummo * published by the Free Software Foundation. 10fd507e2fSAlessandro Zummo */ 11fd507e2fSAlessandro Zummo 12fd507e2fSAlessandro Zummo #include <linux/module.h> 13fd507e2fSAlessandro Zummo #include <linux/rtc.h> 14fd507e2fSAlessandro Zummo #include <linux/platform_device.h> 1538f7b009SHartley Sweeten #include <linux/io.h> 16fd507e2fSAlessandro Zummo 1738f7b009SHartley Sweeten #define EP93XX_RTC_DATA 0x000 1838f7b009SHartley Sweeten #define EP93XX_RTC_MATCH 0x004 1938f7b009SHartley Sweeten #define EP93XX_RTC_STATUS 0x008 2038f7b009SHartley Sweeten #define EP93XX_RTC_STATUS_INTR (1<<0) 2138f7b009SHartley Sweeten #define EP93XX_RTC_LOAD 0x00C 2238f7b009SHartley Sweeten #define EP93XX_RTC_CONTROL 0x010 2338f7b009SHartley Sweeten #define EP93XX_RTC_CONTROL_MIE (1<<0) 2438f7b009SHartley Sweeten #define EP93XX_RTC_SWCOMP 0x108 2538f7b009SHartley Sweeten #define EP93XX_RTC_SWCOMP_DEL_MASK 0x001f0000 2638f7b009SHartley Sweeten #define EP93XX_RTC_SWCOMP_DEL_SHIFT 16 2738f7b009SHartley Sweeten #define EP93XX_RTC_SWCOMP_INT_MASK 0x0000ffff 2838f7b009SHartley Sweeten #define EP93XX_RTC_SWCOMP_INT_SHIFT 0 29fd507e2fSAlessandro Zummo 3038f7b009SHartley Sweeten #define DRV_VERSION "0.3" 31fd507e2fSAlessandro Zummo 3238f7b009SHartley Sweeten /* 3338f7b009SHartley Sweeten * struct device dev.platform_data is used to store our private data 3438f7b009SHartley Sweeten * because struct rtc_device does not have a variable to hold it. 3538f7b009SHartley Sweeten */ 3638f7b009SHartley Sweeten struct ep93xx_rtc { 3738f7b009SHartley Sweeten void __iomem *mmio_base; 3838f7b009SHartley Sweeten }; 3938f7b009SHartley Sweeten 4038f7b009SHartley Sweeten static int ep93xx_rtc_get_swcomp(struct device *dev, unsigned short *preload, 41fd507e2fSAlessandro Zummo unsigned short *delete) 42fd507e2fSAlessandro Zummo { 4338f7b009SHartley Sweeten struct ep93xx_rtc *ep93xx_rtc = dev->platform_data; 4438f7b009SHartley Sweeten unsigned long comp; 4538f7b009SHartley Sweeten 4638f7b009SHartley Sweeten comp = __raw_readl(ep93xx_rtc->mmio_base + EP93XX_RTC_SWCOMP); 47fd507e2fSAlessandro Zummo 48fd507e2fSAlessandro Zummo if (preload) 4938f7b009SHartley Sweeten *preload = (comp & EP93XX_RTC_SWCOMP_INT_MASK) 5038f7b009SHartley Sweeten >> EP93XX_RTC_SWCOMP_INT_SHIFT; 51fd507e2fSAlessandro Zummo 52fd507e2fSAlessandro Zummo if (delete) 5338f7b009SHartley Sweeten *delete = (comp & EP93XX_RTC_SWCOMP_DEL_MASK) 5438f7b009SHartley Sweeten >> EP93XX_RTC_SWCOMP_DEL_SHIFT; 55fd507e2fSAlessandro Zummo 56fd507e2fSAlessandro Zummo return 0; 57fd507e2fSAlessandro Zummo } 58fd507e2fSAlessandro Zummo 59fd507e2fSAlessandro Zummo static int ep93xx_rtc_read_time(struct device *dev, struct rtc_time *tm) 60fd507e2fSAlessandro Zummo { 6138f7b009SHartley Sweeten struct ep93xx_rtc *ep93xx_rtc = dev->platform_data; 6238f7b009SHartley Sweeten unsigned long time; 6338f7b009SHartley Sweeten 6438f7b009SHartley Sweeten time = __raw_readl(ep93xx_rtc->mmio_base + EP93XX_RTC_DATA); 65fd507e2fSAlessandro Zummo 66fd507e2fSAlessandro Zummo rtc_time_to_tm(time, tm); 67fd507e2fSAlessandro Zummo return 0; 68fd507e2fSAlessandro Zummo } 69fd507e2fSAlessandro Zummo 70fd507e2fSAlessandro Zummo static int ep93xx_rtc_set_mmss(struct device *dev, unsigned long secs) 71fd507e2fSAlessandro Zummo { 7238f7b009SHartley Sweeten struct ep93xx_rtc *ep93xx_rtc = dev->platform_data; 7338f7b009SHartley Sweeten 7438f7b009SHartley Sweeten __raw_writel(secs + 1, ep93xx_rtc->mmio_base + EP93XX_RTC_LOAD); 75fd507e2fSAlessandro Zummo return 0; 76fd507e2fSAlessandro Zummo } 77fd507e2fSAlessandro Zummo 78fd507e2fSAlessandro Zummo static int ep93xx_rtc_proc(struct device *dev, struct seq_file *seq) 79fd507e2fSAlessandro Zummo { 80fd507e2fSAlessandro Zummo unsigned short preload, delete; 81fd507e2fSAlessandro Zummo 8238f7b009SHartley Sweeten ep93xx_rtc_get_swcomp(dev, &preload, &delete); 83fd507e2fSAlessandro Zummo 84fd507e2fSAlessandro Zummo seq_printf(seq, "preload\t\t: %d\n", preload); 85fd507e2fSAlessandro Zummo seq_printf(seq, "delete\t\t: %d\n", delete); 86fd507e2fSAlessandro Zummo 87fd507e2fSAlessandro Zummo return 0; 88fd507e2fSAlessandro Zummo } 89fd507e2fSAlessandro Zummo 90ff8371acSDavid Brownell static const struct rtc_class_ops ep93xx_rtc_ops = { 91fd507e2fSAlessandro Zummo .read_time = ep93xx_rtc_read_time, 92fd507e2fSAlessandro Zummo .set_mmss = ep93xx_rtc_set_mmss, 93fd507e2fSAlessandro Zummo .proc = ep93xx_rtc_proc, 94fd507e2fSAlessandro Zummo }; 95fd507e2fSAlessandro Zummo 9638f7b009SHartley Sweeten static ssize_t ep93xx_rtc_show_comp_preload(struct device *dev, 97fd507e2fSAlessandro Zummo struct device_attribute *attr, char *buf) 98fd507e2fSAlessandro Zummo { 99fd507e2fSAlessandro Zummo unsigned short preload; 100fd507e2fSAlessandro Zummo 10138f7b009SHartley Sweeten ep93xx_rtc_get_swcomp(dev, &preload, NULL); 102fd507e2fSAlessandro Zummo 103fd507e2fSAlessandro Zummo return sprintf(buf, "%d\n", preload); 104fd507e2fSAlessandro Zummo } 10538f7b009SHartley Sweeten static DEVICE_ATTR(comp_preload, S_IRUGO, ep93xx_rtc_show_comp_preload, NULL); 106fd507e2fSAlessandro Zummo 10738f7b009SHartley Sweeten static ssize_t ep93xx_rtc_show_comp_delete(struct device *dev, 108fd507e2fSAlessandro Zummo struct device_attribute *attr, char *buf) 109fd507e2fSAlessandro Zummo { 110fd507e2fSAlessandro Zummo unsigned short delete; 111fd507e2fSAlessandro Zummo 11238f7b009SHartley Sweeten ep93xx_rtc_get_swcomp(dev, NULL, &delete); 113fd507e2fSAlessandro Zummo 114fd507e2fSAlessandro Zummo return sprintf(buf, "%d\n", delete); 115fd507e2fSAlessandro Zummo } 11638f7b009SHartley Sweeten static DEVICE_ATTR(comp_delete, S_IRUGO, ep93xx_rtc_show_comp_delete, NULL); 117fd507e2fSAlessandro Zummo 118*b4877d2bSH Hartley Sweeten static struct attribute *ep93xx_rtc_attrs[] = { 119*b4877d2bSH Hartley Sweeten &dev_attr_comp_preload.attr, 120*b4877d2bSH Hartley Sweeten &dev_attr_comp_delete.attr, 121*b4877d2bSH Hartley Sweeten NULL 122*b4877d2bSH Hartley Sweeten }; 123*b4877d2bSH Hartley Sweeten 124*b4877d2bSH Hartley Sweeten static const struct attribute_group ep93xx_rtc_sysfs_files = { 125*b4877d2bSH Hartley Sweeten .attrs = ep93xx_rtc_attrs, 126*b4877d2bSH Hartley Sweeten }; 127fd507e2fSAlessandro Zummo 12838f7b009SHartley Sweeten static int __init ep93xx_rtc_probe(struct platform_device *pdev) 129fd507e2fSAlessandro Zummo { 13038f7b009SHartley Sweeten struct ep93xx_rtc *ep93xx_rtc; 13138f7b009SHartley Sweeten struct resource *res; 13238f7b009SHartley Sweeten struct rtc_device *rtc; 13338f7b009SHartley Sweeten int err; 134fd507e2fSAlessandro Zummo 135*b4877d2bSH Hartley Sweeten ep93xx_rtc = devm_kzalloc(&pdev->dev, sizeof(*ep93xx_rtc), GFP_KERNEL); 136*b4877d2bSH Hartley Sweeten if (!ep93xx_rtc) 13738f7b009SHartley Sweeten return -ENOMEM; 13838f7b009SHartley Sweeten 13938f7b009SHartley Sweeten res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 140*b4877d2bSH Hartley Sweeten if (!res) 141*b4877d2bSH Hartley Sweeten return -ENXIO; 14238f7b009SHartley Sweeten 143*b4877d2bSH Hartley Sweeten if (!devm_request_mem_region(&pdev->dev, res->start, 144*b4877d2bSH Hartley Sweeten resource_size(res), pdev->name)) 145*b4877d2bSH Hartley Sweeten return -EBUSY; 14638f7b009SHartley Sweeten 147*b4877d2bSH Hartley Sweeten ep93xx_rtc->mmio_base = devm_ioremap(&pdev->dev, res->start, 148*b4877d2bSH Hartley Sweeten resource_size(res)); 149*b4877d2bSH Hartley Sweeten if (!ep93xx_rtc->mmio_base) 150*b4877d2bSH Hartley Sweeten return -ENXIO; 151fd507e2fSAlessandro Zummo 15238f7b009SHartley Sweeten pdev->dev.platform_data = ep93xx_rtc; 153fd507e2fSAlessandro Zummo 15438f7b009SHartley Sweeten rtc = rtc_device_register(pdev->name, 15538f7b009SHartley Sweeten &pdev->dev, &ep93xx_rtc_ops, THIS_MODULE); 15638f7b009SHartley Sweeten if (IS_ERR(rtc)) { 15738f7b009SHartley Sweeten err = PTR_ERR(rtc); 158*b4877d2bSH Hartley Sweeten goto exit; 15938f7b009SHartley Sweeten } 16038f7b009SHartley Sweeten 16138f7b009SHartley Sweeten platform_set_drvdata(pdev, rtc); 16238f7b009SHartley Sweeten 163*b4877d2bSH Hartley Sweeten err = sysfs_create_group(&pdev->dev.kobj, &ep93xx_rtc_sysfs_files); 16438f7b009SHartley Sweeten if (err) 16538f7b009SHartley Sweeten goto fail; 166fd507e2fSAlessandro Zummo 167fd507e2fSAlessandro Zummo return 0; 16838f7b009SHartley Sweeten 16938f7b009SHartley Sweeten fail: 170*b4877d2bSH Hartley Sweeten platform_set_drvdata(pdev, NULL); 171*b4877d2bSH Hartley Sweeten rtc_device_unregister(rtc); 172*b4877d2bSH Hartley Sweeten exit: 17338f7b009SHartley Sweeten pdev->dev.platform_data = NULL; 17438f7b009SHartley Sweeten return err; 175fd507e2fSAlessandro Zummo } 176fd507e2fSAlessandro Zummo 17738f7b009SHartley Sweeten static int __exit ep93xx_rtc_remove(struct platform_device *pdev) 178fd507e2fSAlessandro Zummo { 17938f7b009SHartley Sweeten struct rtc_device *rtc = platform_get_drvdata(pdev); 180fd507e2fSAlessandro Zummo 181*b4877d2bSH Hartley Sweeten sysfs_remove_group(&pdev->dev.kobj, &ep93xx_rtc_sysfs_files); 18238f7b009SHartley Sweeten platform_set_drvdata(pdev, NULL); 183*b4877d2bSH Hartley Sweeten rtc_device_unregister(rtc); 184*b4877d2bSH Hartley Sweeten pdev->dev.platform_data = NULL; 185fd507e2fSAlessandro Zummo 186fd507e2fSAlessandro Zummo return 0; 187fd507e2fSAlessandro Zummo } 188fd507e2fSAlessandro Zummo 189ad28a07bSKay Sievers /* work with hotplug and coldplug */ 190ad28a07bSKay Sievers MODULE_ALIAS("platform:ep93xx-rtc"); 191ad28a07bSKay Sievers 19238f7b009SHartley Sweeten static struct platform_driver ep93xx_rtc_driver = { 193fd507e2fSAlessandro Zummo .driver = { 194fd507e2fSAlessandro Zummo .name = "ep93xx-rtc", 195fd507e2fSAlessandro Zummo .owner = THIS_MODULE, 196fd507e2fSAlessandro Zummo }, 19738f7b009SHartley Sweeten .remove = __exit_p(ep93xx_rtc_remove), 198fd507e2fSAlessandro Zummo }; 199fd507e2fSAlessandro Zummo 200fd507e2fSAlessandro Zummo static int __init ep93xx_rtc_init(void) 201fd507e2fSAlessandro Zummo { 20238f7b009SHartley Sweeten return platform_driver_probe(&ep93xx_rtc_driver, ep93xx_rtc_probe); 203fd507e2fSAlessandro Zummo } 204fd507e2fSAlessandro Zummo 205fd507e2fSAlessandro Zummo static void __exit ep93xx_rtc_exit(void) 206fd507e2fSAlessandro Zummo { 20738f7b009SHartley Sweeten platform_driver_unregister(&ep93xx_rtc_driver); 208fd507e2fSAlessandro Zummo } 209fd507e2fSAlessandro Zummo 210fd507e2fSAlessandro Zummo MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); 211fd507e2fSAlessandro Zummo MODULE_DESCRIPTION("EP93XX RTC driver"); 212fd507e2fSAlessandro Zummo MODULE_LICENSE("GPL"); 213fd507e2fSAlessandro Zummo MODULE_VERSION(DRV_VERSION); 214fd507e2fSAlessandro Zummo 215fd507e2fSAlessandro Zummo module_init(ep93xx_rtc_init); 216fd507e2fSAlessandro Zummo module_exit(ep93xx_rtc_exit); 217