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> 165a0e3ad6STejun Heo #include <linux/gfp.h> 17fd507e2fSAlessandro Zummo 1838f7b009SHartley Sweeten #define EP93XX_RTC_DATA 0x000 1938f7b009SHartley Sweeten #define EP93XX_RTC_MATCH 0x004 2038f7b009SHartley Sweeten #define EP93XX_RTC_STATUS 0x008 2138f7b009SHartley Sweeten #define EP93XX_RTC_STATUS_INTR (1<<0) 2238f7b009SHartley Sweeten #define EP93XX_RTC_LOAD 0x00C 2338f7b009SHartley Sweeten #define EP93XX_RTC_CONTROL 0x010 2438f7b009SHartley Sweeten #define EP93XX_RTC_CONTROL_MIE (1<<0) 2538f7b009SHartley Sweeten #define EP93XX_RTC_SWCOMP 0x108 2638f7b009SHartley Sweeten #define EP93XX_RTC_SWCOMP_DEL_MASK 0x001f0000 2738f7b009SHartley Sweeten #define EP93XX_RTC_SWCOMP_DEL_SHIFT 16 2838f7b009SHartley Sweeten #define EP93XX_RTC_SWCOMP_INT_MASK 0x0000ffff 2938f7b009SHartley Sweeten #define EP93XX_RTC_SWCOMP_INT_SHIFT 0 30fd507e2fSAlessandro Zummo 3138f7b009SHartley Sweeten #define DRV_VERSION "0.3" 32fd507e2fSAlessandro Zummo 3338f7b009SHartley Sweeten /* 3438f7b009SHartley Sweeten * struct device dev.platform_data is used to store our private data 3538f7b009SHartley Sweeten * because struct rtc_device does not have a variable to hold it. 3638f7b009SHartley Sweeten */ 3738f7b009SHartley Sweeten struct ep93xx_rtc { 3838f7b009SHartley Sweeten void __iomem *mmio_base; 39bf6ed027SAxel Lin struct rtc_device *rtc; 4038f7b009SHartley Sweeten }; 4138f7b009SHartley Sweeten 4238f7b009SHartley Sweeten static int ep93xx_rtc_get_swcomp(struct device *dev, unsigned short *preload, 43fd507e2fSAlessandro Zummo unsigned short *delete) 44fd507e2fSAlessandro Zummo { 4538f7b009SHartley Sweeten struct ep93xx_rtc *ep93xx_rtc = dev->platform_data; 4638f7b009SHartley Sweeten unsigned long comp; 4738f7b009SHartley Sweeten 4838f7b009SHartley Sweeten comp = __raw_readl(ep93xx_rtc->mmio_base + EP93XX_RTC_SWCOMP); 49fd507e2fSAlessandro Zummo 50fd507e2fSAlessandro Zummo if (preload) 5138f7b009SHartley Sweeten *preload = (comp & EP93XX_RTC_SWCOMP_INT_MASK) 5238f7b009SHartley Sweeten >> EP93XX_RTC_SWCOMP_INT_SHIFT; 53fd507e2fSAlessandro Zummo 54fd507e2fSAlessandro Zummo if (delete) 5538f7b009SHartley Sweeten *delete = (comp & EP93XX_RTC_SWCOMP_DEL_MASK) 5638f7b009SHartley Sweeten >> EP93XX_RTC_SWCOMP_DEL_SHIFT; 57fd507e2fSAlessandro Zummo 58fd507e2fSAlessandro Zummo return 0; 59fd507e2fSAlessandro Zummo } 60fd507e2fSAlessandro Zummo 61fd507e2fSAlessandro Zummo static int ep93xx_rtc_read_time(struct device *dev, struct rtc_time *tm) 62fd507e2fSAlessandro Zummo { 6338f7b009SHartley Sweeten struct ep93xx_rtc *ep93xx_rtc = dev->platform_data; 6438f7b009SHartley Sweeten unsigned long time; 6538f7b009SHartley Sweeten 6638f7b009SHartley Sweeten time = __raw_readl(ep93xx_rtc->mmio_base + EP93XX_RTC_DATA); 67fd507e2fSAlessandro Zummo 68fd507e2fSAlessandro Zummo rtc_time_to_tm(time, tm); 69fd507e2fSAlessandro Zummo return 0; 70fd507e2fSAlessandro Zummo } 71fd507e2fSAlessandro Zummo 72fd507e2fSAlessandro Zummo static int ep93xx_rtc_set_mmss(struct device *dev, unsigned long secs) 73fd507e2fSAlessandro Zummo { 7438f7b009SHartley Sweeten struct ep93xx_rtc *ep93xx_rtc = dev->platform_data; 7538f7b009SHartley Sweeten 7638f7b009SHartley Sweeten __raw_writel(secs + 1, ep93xx_rtc->mmio_base + EP93XX_RTC_LOAD); 77fd507e2fSAlessandro Zummo return 0; 78fd507e2fSAlessandro Zummo } 79fd507e2fSAlessandro Zummo 80fd507e2fSAlessandro Zummo static int ep93xx_rtc_proc(struct device *dev, struct seq_file *seq) 81fd507e2fSAlessandro Zummo { 82fd507e2fSAlessandro Zummo unsigned short preload, delete; 83fd507e2fSAlessandro Zummo 8438f7b009SHartley Sweeten ep93xx_rtc_get_swcomp(dev, &preload, &delete); 85fd507e2fSAlessandro Zummo 86fd507e2fSAlessandro Zummo seq_printf(seq, "preload\t\t: %d\n", preload); 87fd507e2fSAlessandro Zummo seq_printf(seq, "delete\t\t: %d\n", delete); 88fd507e2fSAlessandro Zummo 89fd507e2fSAlessandro Zummo return 0; 90fd507e2fSAlessandro Zummo } 91fd507e2fSAlessandro Zummo 92ff8371acSDavid Brownell static const struct rtc_class_ops ep93xx_rtc_ops = { 93fd507e2fSAlessandro Zummo .read_time = ep93xx_rtc_read_time, 94fd507e2fSAlessandro Zummo .set_mmss = ep93xx_rtc_set_mmss, 95fd507e2fSAlessandro Zummo .proc = ep93xx_rtc_proc, 96fd507e2fSAlessandro Zummo }; 97fd507e2fSAlessandro Zummo 9838f7b009SHartley Sweeten static ssize_t ep93xx_rtc_show_comp_preload(struct device *dev, 99fd507e2fSAlessandro Zummo struct device_attribute *attr, char *buf) 100fd507e2fSAlessandro Zummo { 101fd507e2fSAlessandro Zummo unsigned short preload; 102fd507e2fSAlessandro Zummo 10338f7b009SHartley Sweeten ep93xx_rtc_get_swcomp(dev, &preload, NULL); 104fd507e2fSAlessandro Zummo 105fd507e2fSAlessandro Zummo return sprintf(buf, "%d\n", preload); 106fd507e2fSAlessandro Zummo } 10738f7b009SHartley Sweeten static DEVICE_ATTR(comp_preload, S_IRUGO, ep93xx_rtc_show_comp_preload, NULL); 108fd507e2fSAlessandro Zummo 10938f7b009SHartley Sweeten static ssize_t ep93xx_rtc_show_comp_delete(struct device *dev, 110fd507e2fSAlessandro Zummo struct device_attribute *attr, char *buf) 111fd507e2fSAlessandro Zummo { 112fd507e2fSAlessandro Zummo unsigned short delete; 113fd507e2fSAlessandro Zummo 11438f7b009SHartley Sweeten ep93xx_rtc_get_swcomp(dev, NULL, &delete); 115fd507e2fSAlessandro Zummo 116fd507e2fSAlessandro Zummo return sprintf(buf, "%d\n", delete); 117fd507e2fSAlessandro Zummo } 11838f7b009SHartley Sweeten static DEVICE_ATTR(comp_delete, S_IRUGO, ep93xx_rtc_show_comp_delete, NULL); 119fd507e2fSAlessandro Zummo 120b4877d2bSH Hartley Sweeten static struct attribute *ep93xx_rtc_attrs[] = { 121b4877d2bSH Hartley Sweeten &dev_attr_comp_preload.attr, 122b4877d2bSH Hartley Sweeten &dev_attr_comp_delete.attr, 123b4877d2bSH Hartley Sweeten NULL 124b4877d2bSH Hartley Sweeten }; 125b4877d2bSH Hartley Sweeten 126b4877d2bSH Hartley Sweeten static const struct attribute_group ep93xx_rtc_sysfs_files = { 127b4877d2bSH Hartley Sweeten .attrs = ep93xx_rtc_attrs, 128b4877d2bSH Hartley Sweeten }; 129fd507e2fSAlessandro Zummo 1305a167f45SGreg Kroah-Hartman static int ep93xx_rtc_probe(struct platform_device *pdev) 131fd507e2fSAlessandro Zummo { 13238f7b009SHartley Sweeten struct ep93xx_rtc *ep93xx_rtc; 13338f7b009SHartley Sweeten struct resource *res; 13438f7b009SHartley Sweeten int err; 135fd507e2fSAlessandro Zummo 136b4877d2bSH Hartley Sweeten ep93xx_rtc = devm_kzalloc(&pdev->dev, sizeof(*ep93xx_rtc), GFP_KERNEL); 137b4877d2bSH Hartley Sweeten if (!ep93xx_rtc) 13838f7b009SHartley Sweeten return -ENOMEM; 13938f7b009SHartley Sweeten 14038f7b009SHartley Sweeten res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 141*7c1d69eeSJulia Lawall ep93xx_rtc->mmio_base = devm_ioremap_resource(&pdev->dev, res); 142*7c1d69eeSJulia Lawall if (IS_ERR(ep93xx_rtc->mmio_base)) 143*7c1d69eeSJulia Lawall return PTR_ERR(ep93xx_rtc->mmio_base); 144fd507e2fSAlessandro Zummo 14538f7b009SHartley Sweeten pdev->dev.platform_data = ep93xx_rtc; 146bf6ed027SAxel Lin platform_set_drvdata(pdev, ep93xx_rtc); 147fd507e2fSAlessandro Zummo 1485d65cbfbSJingoo Han ep93xx_rtc->rtc = devm_rtc_device_register(&pdev->dev, 1495d65cbfbSJingoo Han pdev->name, &ep93xx_rtc_ops, THIS_MODULE); 150bf6ed027SAxel Lin if (IS_ERR(ep93xx_rtc->rtc)) { 151bf6ed027SAxel Lin err = PTR_ERR(ep93xx_rtc->rtc); 152b4877d2bSH Hartley Sweeten goto exit; 15338f7b009SHartley Sweeten } 15438f7b009SHartley Sweeten 155b4877d2bSH Hartley Sweeten err = sysfs_create_group(&pdev->dev.kobj, &ep93xx_rtc_sysfs_files); 15638f7b009SHartley Sweeten if (err) 1575d65cbfbSJingoo Han goto exit; 158fd507e2fSAlessandro Zummo 159fd507e2fSAlessandro Zummo return 0; 16038f7b009SHartley Sweeten 161b4877d2bSH Hartley Sweeten exit: 16238f7b009SHartley Sweeten pdev->dev.platform_data = NULL; 16338f7b009SHartley Sweeten return err; 164fd507e2fSAlessandro Zummo } 165fd507e2fSAlessandro Zummo 1665a167f45SGreg Kroah-Hartman static int ep93xx_rtc_remove(struct platform_device *pdev) 167fd507e2fSAlessandro Zummo { 168b4877d2bSH Hartley Sweeten sysfs_remove_group(&pdev->dev.kobj, &ep93xx_rtc_sysfs_files); 169b4877d2bSH Hartley Sweeten pdev->dev.platform_data = NULL; 170fd507e2fSAlessandro Zummo 171fd507e2fSAlessandro Zummo return 0; 172fd507e2fSAlessandro Zummo } 173fd507e2fSAlessandro Zummo 17438f7b009SHartley Sweeten static struct platform_driver ep93xx_rtc_driver = { 175fd507e2fSAlessandro Zummo .driver = { 176fd507e2fSAlessandro Zummo .name = "ep93xx-rtc", 177fd507e2fSAlessandro Zummo .owner = THIS_MODULE, 178fd507e2fSAlessandro Zummo }, 17984d56b38SH Hartley Sweeten .probe = ep93xx_rtc_probe, 1805a167f45SGreg Kroah-Hartman .remove = ep93xx_rtc_remove, 181fd507e2fSAlessandro Zummo }; 182fd507e2fSAlessandro Zummo 18384d56b38SH Hartley Sweeten module_platform_driver(ep93xx_rtc_driver); 184fd507e2fSAlessandro Zummo 185fd507e2fSAlessandro Zummo MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); 186fd507e2fSAlessandro Zummo MODULE_DESCRIPTION("EP93XX RTC driver"); 187fd507e2fSAlessandro Zummo MODULE_LICENSE("GPL"); 188fd507e2fSAlessandro Zummo MODULE_VERSION(DRV_VERSION); 18984d56b38SH Hartley Sweeten MODULE_ALIAS("platform:ep93xx-rtc"); 190