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> 15*38f7b009SHartley Sweeten #include <linux/io.h> 16fd507e2fSAlessandro Zummo 17*38f7b009SHartley Sweeten #define EP93XX_RTC_DATA 0x000 18*38f7b009SHartley Sweeten #define EP93XX_RTC_MATCH 0x004 19*38f7b009SHartley Sweeten #define EP93XX_RTC_STATUS 0x008 20*38f7b009SHartley Sweeten #define EP93XX_RTC_STATUS_INTR (1<<0) 21*38f7b009SHartley Sweeten #define EP93XX_RTC_LOAD 0x00C 22*38f7b009SHartley Sweeten #define EP93XX_RTC_CONTROL 0x010 23*38f7b009SHartley Sweeten #define EP93XX_RTC_CONTROL_MIE (1<<0) 24*38f7b009SHartley Sweeten #define EP93XX_RTC_SWCOMP 0x108 25*38f7b009SHartley Sweeten #define EP93XX_RTC_SWCOMP_DEL_MASK 0x001f0000 26*38f7b009SHartley Sweeten #define EP93XX_RTC_SWCOMP_DEL_SHIFT 16 27*38f7b009SHartley Sweeten #define EP93XX_RTC_SWCOMP_INT_MASK 0x0000ffff 28*38f7b009SHartley Sweeten #define EP93XX_RTC_SWCOMP_INT_SHIFT 0 29fd507e2fSAlessandro Zummo 30*38f7b009SHartley Sweeten #define DRV_VERSION "0.3" 31fd507e2fSAlessandro Zummo 32*38f7b009SHartley Sweeten /* 33*38f7b009SHartley Sweeten * struct device dev.platform_data is used to store our private data 34*38f7b009SHartley Sweeten * because struct rtc_device does not have a variable to hold it. 35*38f7b009SHartley Sweeten */ 36*38f7b009SHartley Sweeten struct ep93xx_rtc { 37*38f7b009SHartley Sweeten void __iomem *mmio_base; 38*38f7b009SHartley Sweeten }; 39*38f7b009SHartley Sweeten 40*38f7b009SHartley Sweeten static int ep93xx_rtc_get_swcomp(struct device *dev, unsigned short *preload, 41fd507e2fSAlessandro Zummo unsigned short *delete) 42fd507e2fSAlessandro Zummo { 43*38f7b009SHartley Sweeten struct ep93xx_rtc *ep93xx_rtc = dev->platform_data; 44*38f7b009SHartley Sweeten unsigned long comp; 45*38f7b009SHartley Sweeten 46*38f7b009SHartley Sweeten comp = __raw_readl(ep93xx_rtc->mmio_base + EP93XX_RTC_SWCOMP); 47fd507e2fSAlessandro Zummo 48fd507e2fSAlessandro Zummo if (preload) 49*38f7b009SHartley Sweeten *preload = (comp & EP93XX_RTC_SWCOMP_INT_MASK) 50*38f7b009SHartley Sweeten >> EP93XX_RTC_SWCOMP_INT_SHIFT; 51fd507e2fSAlessandro Zummo 52fd507e2fSAlessandro Zummo if (delete) 53*38f7b009SHartley Sweeten *delete = (comp & EP93XX_RTC_SWCOMP_DEL_MASK) 54*38f7b009SHartley 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 { 61*38f7b009SHartley Sweeten struct ep93xx_rtc *ep93xx_rtc = dev->platform_data; 62*38f7b009SHartley Sweeten unsigned long time; 63*38f7b009SHartley Sweeten 64*38f7b009SHartley 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 { 72*38f7b009SHartley Sweeten struct ep93xx_rtc *ep93xx_rtc = dev->platform_data; 73*38f7b009SHartley Sweeten 74*38f7b009SHartley 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 82*38f7b009SHartley 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 96*38f7b009SHartley 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 101*38f7b009SHartley Sweeten ep93xx_rtc_get_swcomp(dev, &preload, NULL); 102fd507e2fSAlessandro Zummo 103fd507e2fSAlessandro Zummo return sprintf(buf, "%d\n", preload); 104fd507e2fSAlessandro Zummo } 105*38f7b009SHartley Sweeten static DEVICE_ATTR(comp_preload, S_IRUGO, ep93xx_rtc_show_comp_preload, NULL); 106fd507e2fSAlessandro Zummo 107*38f7b009SHartley 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 112*38f7b009SHartley Sweeten ep93xx_rtc_get_swcomp(dev, NULL, &delete); 113fd507e2fSAlessandro Zummo 114fd507e2fSAlessandro Zummo return sprintf(buf, "%d\n", delete); 115fd507e2fSAlessandro Zummo } 116*38f7b009SHartley Sweeten static DEVICE_ATTR(comp_delete, S_IRUGO, ep93xx_rtc_show_comp_delete, NULL); 117fd507e2fSAlessandro Zummo 118fd507e2fSAlessandro Zummo 119*38f7b009SHartley Sweeten static int __init ep93xx_rtc_probe(struct platform_device *pdev) 120fd507e2fSAlessandro Zummo { 121*38f7b009SHartley Sweeten struct ep93xx_rtc *ep93xx_rtc; 122*38f7b009SHartley Sweeten struct resource *res; 123*38f7b009SHartley Sweeten struct rtc_device *rtc; 124*38f7b009SHartley Sweeten int err; 125fd507e2fSAlessandro Zummo 126*38f7b009SHartley Sweeten ep93xx_rtc = kzalloc(sizeof(struct ep93xx_rtc), GFP_KERNEL); 127*38f7b009SHartley Sweeten if (ep93xx_rtc == NULL) 128*38f7b009SHartley Sweeten return -ENOMEM; 129*38f7b009SHartley Sweeten 130*38f7b009SHartley Sweeten res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 131*38f7b009SHartley Sweeten if (res == NULL) 132*38f7b009SHartley Sweeten return -ENXIO; 133*38f7b009SHartley Sweeten 134*38f7b009SHartley Sweeten res = request_mem_region(res->start, resource_size(res), pdev->name); 135*38f7b009SHartley Sweeten if (res == NULL) 136*38f7b009SHartley Sweeten return -EBUSY; 137*38f7b009SHartley Sweeten 138*38f7b009SHartley Sweeten ep93xx_rtc->mmio_base = ioremap(res->start, resource_size(res)); 139*38f7b009SHartley Sweeten if (ep93xx_rtc->mmio_base == NULL) { 140*38f7b009SHartley Sweeten err = -ENXIO; 141*38f7b009SHartley Sweeten goto fail; 142fd507e2fSAlessandro Zummo } 143fd507e2fSAlessandro Zummo 144*38f7b009SHartley Sweeten pdev->dev.platform_data = ep93xx_rtc; 145fd507e2fSAlessandro Zummo 146*38f7b009SHartley Sweeten rtc = rtc_device_register(pdev->name, 147*38f7b009SHartley Sweeten &pdev->dev, &ep93xx_rtc_ops, THIS_MODULE); 148*38f7b009SHartley Sweeten if (IS_ERR(rtc)) { 149*38f7b009SHartley Sweeten err = PTR_ERR(rtc); 150*38f7b009SHartley Sweeten goto fail; 151*38f7b009SHartley Sweeten } 152*38f7b009SHartley Sweeten 153*38f7b009SHartley Sweeten platform_set_drvdata(pdev, rtc); 154*38f7b009SHartley Sweeten 155*38f7b009SHartley Sweeten err = device_create_file(&pdev->dev, &dev_attr_comp_preload); 156*38f7b009SHartley Sweeten if (err) 157*38f7b009SHartley Sweeten goto fail; 158*38f7b009SHartley Sweeten err = device_create_file(&pdev->dev, &dev_attr_comp_delete); 159*38f7b009SHartley Sweeten if (err) { 160*38f7b009SHartley Sweeten device_remove_file(&pdev->dev, &dev_attr_comp_preload); 161*38f7b009SHartley Sweeten goto fail; 162*38f7b009SHartley Sweeten } 163fd507e2fSAlessandro Zummo 164fd507e2fSAlessandro Zummo return 0; 165*38f7b009SHartley Sweeten 166*38f7b009SHartley Sweeten fail: 167*38f7b009SHartley Sweeten if (ep93xx_rtc->mmio_base) { 168*38f7b009SHartley Sweeten iounmap(ep93xx_rtc->mmio_base); 169*38f7b009SHartley Sweeten pdev->dev.platform_data = NULL; 170*38f7b009SHartley Sweeten } 171*38f7b009SHartley Sweeten release_mem_region(res->start, resource_size(res)); 172*38f7b009SHartley Sweeten return err; 173fd507e2fSAlessandro Zummo } 174fd507e2fSAlessandro Zummo 175*38f7b009SHartley Sweeten static int __exit ep93xx_rtc_remove(struct platform_device *pdev) 176fd507e2fSAlessandro Zummo { 177*38f7b009SHartley Sweeten struct rtc_device *rtc = platform_get_drvdata(pdev); 178*38f7b009SHartley Sweeten struct ep93xx_rtc *ep93xx_rtc = pdev->dev.platform_data; 179*38f7b009SHartley Sweeten struct resource *res; 180fd507e2fSAlessandro Zummo 181*38f7b009SHartley Sweeten /* cleanup sysfs */ 182*38f7b009SHartley Sweeten device_remove_file(&pdev->dev, &dev_attr_comp_delete); 183*38f7b009SHartley Sweeten device_remove_file(&pdev->dev, &dev_attr_comp_preload); 184*38f7b009SHartley Sweeten 185fd507e2fSAlessandro Zummo rtc_device_unregister(rtc); 186fd507e2fSAlessandro Zummo 187*38f7b009SHartley Sweeten iounmap(ep93xx_rtc->mmio_base); 188*38f7b009SHartley Sweeten pdev->dev.platform_data = NULL; 189*38f7b009SHartley Sweeten 190*38f7b009SHartley Sweeten res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 191*38f7b009SHartley Sweeten release_mem_region(res->start, resource_size(res)); 192*38f7b009SHartley Sweeten 193*38f7b009SHartley Sweeten platform_set_drvdata(pdev, NULL); 194fd507e2fSAlessandro Zummo 195fd507e2fSAlessandro Zummo return 0; 196fd507e2fSAlessandro Zummo } 197fd507e2fSAlessandro Zummo 198ad28a07bSKay Sievers /* work with hotplug and coldplug */ 199ad28a07bSKay Sievers MODULE_ALIAS("platform:ep93xx-rtc"); 200ad28a07bSKay Sievers 201*38f7b009SHartley Sweeten static struct platform_driver ep93xx_rtc_driver = { 202fd507e2fSAlessandro Zummo .driver = { 203fd507e2fSAlessandro Zummo .name = "ep93xx-rtc", 204fd507e2fSAlessandro Zummo .owner = THIS_MODULE, 205fd507e2fSAlessandro Zummo }, 206*38f7b009SHartley Sweeten .remove = __exit_p(ep93xx_rtc_remove), 207fd507e2fSAlessandro Zummo }; 208fd507e2fSAlessandro Zummo 209fd507e2fSAlessandro Zummo static int __init ep93xx_rtc_init(void) 210fd507e2fSAlessandro Zummo { 211*38f7b009SHartley Sweeten return platform_driver_probe(&ep93xx_rtc_driver, ep93xx_rtc_probe); 212fd507e2fSAlessandro Zummo } 213fd507e2fSAlessandro Zummo 214fd507e2fSAlessandro Zummo static void __exit ep93xx_rtc_exit(void) 215fd507e2fSAlessandro Zummo { 216*38f7b009SHartley Sweeten platform_driver_unregister(&ep93xx_rtc_driver); 217fd507e2fSAlessandro Zummo } 218fd507e2fSAlessandro Zummo 219fd507e2fSAlessandro Zummo MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); 220fd507e2fSAlessandro Zummo MODULE_DESCRIPTION("EP93XX RTC driver"); 221fd507e2fSAlessandro Zummo MODULE_LICENSE("GPL"); 222fd507e2fSAlessandro Zummo MODULE_VERSION(DRV_VERSION); 223fd507e2fSAlessandro Zummo 224fd507e2fSAlessandro Zummo module_init(ep93xx_rtc_init); 225fd507e2fSAlessandro Zummo module_exit(ep93xx_rtc_exit); 226