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 struct ep93xx_rtc { 3238f7b009SHartley Sweeten void __iomem *mmio_base; 33bf6ed027SAxel Lin struct rtc_device *rtc; 3438f7b009SHartley Sweeten }; 3538f7b009SHartley Sweeten 3638f7b009SHartley Sweeten static int ep93xx_rtc_get_swcomp(struct device *dev, unsigned short *preload, 37fd507e2fSAlessandro Zummo unsigned short *delete) 38fd507e2fSAlessandro Zummo { 3928dc5f80SJingoo Han struct ep93xx_rtc *ep93xx_rtc = dev_get_platdata(dev); 4038f7b009SHartley Sweeten unsigned long comp; 4138f7b009SHartley Sweeten 42ff32ff17SH Hartley Sweeten comp = readl(ep93xx_rtc->mmio_base + EP93XX_RTC_SWCOMP); 43fd507e2fSAlessandro Zummo 44fd507e2fSAlessandro Zummo if (preload) 4538f7b009SHartley Sweeten *preload = (comp & EP93XX_RTC_SWCOMP_INT_MASK) 4638f7b009SHartley Sweeten >> EP93XX_RTC_SWCOMP_INT_SHIFT; 47fd507e2fSAlessandro Zummo 48fd507e2fSAlessandro Zummo if (delete) 4938f7b009SHartley Sweeten *delete = (comp & EP93XX_RTC_SWCOMP_DEL_MASK) 5038f7b009SHartley Sweeten >> EP93XX_RTC_SWCOMP_DEL_SHIFT; 51fd507e2fSAlessandro Zummo 52fd507e2fSAlessandro Zummo return 0; 53fd507e2fSAlessandro Zummo } 54fd507e2fSAlessandro Zummo 55fd507e2fSAlessandro Zummo static int ep93xx_rtc_read_time(struct device *dev, struct rtc_time *tm) 56fd507e2fSAlessandro Zummo { 5728dc5f80SJingoo Han struct ep93xx_rtc *ep93xx_rtc = dev_get_platdata(dev); 5838f7b009SHartley Sweeten unsigned long time; 5938f7b009SHartley Sweeten 60ff32ff17SH Hartley Sweeten time = readl(ep93xx_rtc->mmio_base + EP93XX_RTC_DATA); 61fd507e2fSAlessandro Zummo 62886a77e7SAlexandre Belloni rtc_time64_to_tm(time, tm); 63fd507e2fSAlessandro Zummo return 0; 64fd507e2fSAlessandro Zummo } 65fd507e2fSAlessandro Zummo 66*ef9440a2SAlexandre Belloni static int ep93xx_rtc_set_time(struct device *dev, struct rtc_time *tm) 67fd507e2fSAlessandro Zummo { 6828dc5f80SJingoo Han struct ep93xx_rtc *ep93xx_rtc = dev_get_platdata(dev); 69*ef9440a2SAlexandre Belloni unsigned long secs = rtc_tm_to_time64(tm); 7038f7b009SHartley Sweeten 71ff32ff17SH Hartley Sweeten writel(secs + 1, ep93xx_rtc->mmio_base + EP93XX_RTC_LOAD); 72fd507e2fSAlessandro Zummo return 0; 73fd507e2fSAlessandro Zummo } 74fd507e2fSAlessandro Zummo 75fd507e2fSAlessandro Zummo static int ep93xx_rtc_proc(struct device *dev, struct seq_file *seq) 76fd507e2fSAlessandro Zummo { 77fd507e2fSAlessandro Zummo unsigned short preload, delete; 78fd507e2fSAlessandro Zummo 7938f7b009SHartley Sweeten ep93xx_rtc_get_swcomp(dev, &preload, &delete); 80fd507e2fSAlessandro Zummo 81fd507e2fSAlessandro Zummo seq_printf(seq, "preload\t\t: %d\n", preload); 82fd507e2fSAlessandro Zummo seq_printf(seq, "delete\t\t: %d\n", delete); 83fd507e2fSAlessandro Zummo 84fd507e2fSAlessandro Zummo return 0; 85fd507e2fSAlessandro Zummo } 86fd507e2fSAlessandro Zummo 87ff8371acSDavid Brownell static const struct rtc_class_ops ep93xx_rtc_ops = { 88fd507e2fSAlessandro Zummo .read_time = ep93xx_rtc_read_time, 89*ef9440a2SAlexandre Belloni .set_time = ep93xx_rtc_set_time, 90fd507e2fSAlessandro Zummo .proc = ep93xx_rtc_proc, 91fd507e2fSAlessandro Zummo }; 92fd507e2fSAlessandro Zummo 9338f7b009SHartley Sweeten static ssize_t ep93xx_rtc_show_comp_preload(struct device *dev, 94fd507e2fSAlessandro Zummo struct device_attribute *attr, char *buf) 95fd507e2fSAlessandro Zummo { 96fd507e2fSAlessandro Zummo unsigned short preload; 97fd507e2fSAlessandro Zummo 9809cd030bSAlexandre Belloni ep93xx_rtc_get_swcomp(dev->parent, &preload, NULL); 99fd507e2fSAlessandro Zummo 100fd507e2fSAlessandro Zummo return sprintf(buf, "%d\n", preload); 101fd507e2fSAlessandro Zummo } 10238f7b009SHartley Sweeten static DEVICE_ATTR(comp_preload, S_IRUGO, ep93xx_rtc_show_comp_preload, NULL); 103fd507e2fSAlessandro Zummo 10438f7b009SHartley Sweeten static ssize_t ep93xx_rtc_show_comp_delete(struct device *dev, 105fd507e2fSAlessandro Zummo struct device_attribute *attr, char *buf) 106fd507e2fSAlessandro Zummo { 107fd507e2fSAlessandro Zummo unsigned short delete; 108fd507e2fSAlessandro Zummo 10909cd030bSAlexandre Belloni ep93xx_rtc_get_swcomp(dev->parent, NULL, &delete); 110fd507e2fSAlessandro Zummo 111fd507e2fSAlessandro Zummo return sprintf(buf, "%d\n", delete); 112fd507e2fSAlessandro Zummo } 11338f7b009SHartley Sweeten static DEVICE_ATTR(comp_delete, S_IRUGO, ep93xx_rtc_show_comp_delete, NULL); 114fd507e2fSAlessandro Zummo 115b4877d2bSH Hartley Sweeten static struct attribute *ep93xx_rtc_attrs[] = { 116b4877d2bSH Hartley Sweeten &dev_attr_comp_preload.attr, 117b4877d2bSH Hartley Sweeten &dev_attr_comp_delete.attr, 118b4877d2bSH Hartley Sweeten NULL 119b4877d2bSH Hartley Sweeten }; 120b4877d2bSH Hartley Sweeten 121b4877d2bSH Hartley Sweeten static const struct attribute_group ep93xx_rtc_sysfs_files = { 122b4877d2bSH Hartley Sweeten .attrs = ep93xx_rtc_attrs, 123b4877d2bSH Hartley Sweeten }; 124fd507e2fSAlessandro Zummo 1255a167f45SGreg Kroah-Hartman static int ep93xx_rtc_probe(struct platform_device *pdev) 126fd507e2fSAlessandro Zummo { 12738f7b009SHartley Sweeten struct ep93xx_rtc *ep93xx_rtc; 12838f7b009SHartley Sweeten struct resource *res; 12938f7b009SHartley Sweeten int err; 130fd507e2fSAlessandro Zummo 131b4877d2bSH Hartley Sweeten ep93xx_rtc = devm_kzalloc(&pdev->dev, sizeof(*ep93xx_rtc), GFP_KERNEL); 132b4877d2bSH Hartley Sweeten if (!ep93xx_rtc) 13338f7b009SHartley Sweeten return -ENOMEM; 13438f7b009SHartley Sweeten 13538f7b009SHartley Sweeten res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1367c1d69eeSJulia Lawall ep93xx_rtc->mmio_base = devm_ioremap_resource(&pdev->dev, res); 1377c1d69eeSJulia Lawall if (IS_ERR(ep93xx_rtc->mmio_base)) 1387c1d69eeSJulia Lawall return PTR_ERR(ep93xx_rtc->mmio_base); 139fd507e2fSAlessandro Zummo 140bf6ed027SAxel Lin platform_set_drvdata(pdev, ep93xx_rtc); 141fd507e2fSAlessandro Zummo 142bac68b30SAlexandre Belloni ep93xx_rtc->rtc = devm_rtc_allocate_device(&pdev->dev); 143b809d192SAlexandre Belloni if (IS_ERR(ep93xx_rtc->rtc)) 144b809d192SAlexandre Belloni return PTR_ERR(ep93xx_rtc->rtc); 14538f7b009SHartley Sweeten 146bac68b30SAlexandre Belloni ep93xx_rtc->rtc->ops = &ep93xx_rtc_ops; 1472d4fc6dfSAlexandre Belloni ep93xx_rtc->rtc->range_max = U32_MAX; 148bac68b30SAlexandre Belloni 14909cd030bSAlexandre Belloni err = rtc_add_group(ep93xx_rtc->rtc, &ep93xx_rtc_sysfs_files); 150bac68b30SAlexandre Belloni if (err) 151bac68b30SAlexandre Belloni return err; 152bac68b30SAlexandre Belloni 15309cd030bSAlexandre Belloni return rtc_register_device(ep93xx_rtc->rtc); 154fd507e2fSAlessandro Zummo } 155fd507e2fSAlessandro Zummo 15638f7b009SHartley Sweeten static struct platform_driver ep93xx_rtc_driver = { 157fd507e2fSAlessandro Zummo .driver = { 158fd507e2fSAlessandro Zummo .name = "ep93xx-rtc", 159fd507e2fSAlessandro Zummo }, 16084d56b38SH Hartley Sweeten .probe = ep93xx_rtc_probe, 161fd507e2fSAlessandro Zummo }; 162fd507e2fSAlessandro Zummo 16384d56b38SH Hartley Sweeten module_platform_driver(ep93xx_rtc_driver); 164fd507e2fSAlessandro Zummo 165fd507e2fSAlessandro Zummo MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); 166fd507e2fSAlessandro Zummo MODULE_DESCRIPTION("EP93XX RTC driver"); 167fd507e2fSAlessandro Zummo MODULE_LICENSE("GPL"); 16884d56b38SH Hartley Sweeten MODULE_ALIAS("platform:ep93xx-rtc"); 169