14fdf4d23SAlexandre Belloni // SPDX-License-Identifier: GPL-2.0 2fd507e2fSAlessandro Zummo /* 3fd507e2fSAlessandro Zummo * A driver for the RTC embedded in the Cirrus Logic EP93XX processors 4fd507e2fSAlessandro Zummo * Copyright (c) 2006 Tower Technologies 5fd507e2fSAlessandro Zummo * 6fd507e2fSAlessandro Zummo * Author: Alessandro Zummo <a.zummo@towertech.it> 7fd507e2fSAlessandro Zummo */ 8fd507e2fSAlessandro Zummo 9fd507e2fSAlessandro Zummo #include <linux/module.h> 10*1d70f9feSNikita Shubin #include <linux/mod_devicetable.h> 11fd507e2fSAlessandro Zummo #include <linux/rtc.h> 12fd507e2fSAlessandro Zummo #include <linux/platform_device.h> 1338f7b009SHartley Sweeten #include <linux/io.h> 145a0e3ad6STejun Heo #include <linux/gfp.h> 15fd507e2fSAlessandro Zummo 1638f7b009SHartley Sweeten #define EP93XX_RTC_DATA 0x000 1738f7b009SHartley Sweeten #define EP93XX_RTC_MATCH 0x004 1838f7b009SHartley Sweeten #define EP93XX_RTC_STATUS 0x008 19d71c7715SAlexandre Belloni #define EP93XX_RTC_STATUS_INTR BIT(0) 2038f7b009SHartley Sweeten #define EP93XX_RTC_LOAD 0x00C 2138f7b009SHartley Sweeten #define EP93XX_RTC_CONTROL 0x010 22d71c7715SAlexandre Belloni #define EP93XX_RTC_CONTROL_MIE BIT(0) 2338f7b009SHartley Sweeten #define EP93XX_RTC_SWCOMP 0x108 2438f7b009SHartley Sweeten #define EP93XX_RTC_SWCOMP_DEL_MASK 0x001f0000 2538f7b009SHartley Sweeten #define EP93XX_RTC_SWCOMP_DEL_SHIFT 16 2638f7b009SHartley Sweeten #define EP93XX_RTC_SWCOMP_INT_MASK 0x0000ffff 2738f7b009SHartley Sweeten #define EP93XX_RTC_SWCOMP_INT_SHIFT 0 28fd507e2fSAlessandro Zummo 2938f7b009SHartley Sweeten struct ep93xx_rtc { 3038f7b009SHartley Sweeten void __iomem *mmio_base; 31bf6ed027SAxel Lin struct rtc_device *rtc; 3238f7b009SHartley Sweeten }; 3338f7b009SHartley Sweeten 3438f7b009SHartley Sweeten static int ep93xx_rtc_get_swcomp(struct device *dev, unsigned short *preload, 35fd507e2fSAlessandro Zummo unsigned short *delete) 36fd507e2fSAlessandro Zummo { 3700c33482SNikita Shubin struct ep93xx_rtc *ep93xx_rtc = dev_get_drvdata(dev); 3838f7b009SHartley Sweeten unsigned long comp; 3938f7b009SHartley Sweeten 40ff32ff17SH Hartley Sweeten comp = readl(ep93xx_rtc->mmio_base + EP93XX_RTC_SWCOMP); 41fd507e2fSAlessandro Zummo 42fd507e2fSAlessandro Zummo if (preload) 4338f7b009SHartley Sweeten *preload = (comp & EP93XX_RTC_SWCOMP_INT_MASK) 4438f7b009SHartley Sweeten >> EP93XX_RTC_SWCOMP_INT_SHIFT; 45fd507e2fSAlessandro Zummo 46fd507e2fSAlessandro Zummo if (delete) 4738f7b009SHartley Sweeten *delete = (comp & EP93XX_RTC_SWCOMP_DEL_MASK) 4838f7b009SHartley Sweeten >> EP93XX_RTC_SWCOMP_DEL_SHIFT; 49fd507e2fSAlessandro Zummo 50fd507e2fSAlessandro Zummo return 0; 51fd507e2fSAlessandro Zummo } 52fd507e2fSAlessandro Zummo 53fd507e2fSAlessandro Zummo static int ep93xx_rtc_read_time(struct device *dev, struct rtc_time *tm) 54fd507e2fSAlessandro Zummo { 5500c33482SNikita Shubin struct ep93xx_rtc *ep93xx_rtc = dev_get_drvdata(dev); 5638f7b009SHartley Sweeten unsigned long time; 5738f7b009SHartley Sweeten 58ff32ff17SH Hartley Sweeten time = readl(ep93xx_rtc->mmio_base + EP93XX_RTC_DATA); 59fd507e2fSAlessandro Zummo 60886a77e7SAlexandre Belloni rtc_time64_to_tm(time, tm); 61fd507e2fSAlessandro Zummo return 0; 62fd507e2fSAlessandro Zummo } 63fd507e2fSAlessandro Zummo 64ef9440a2SAlexandre Belloni static int ep93xx_rtc_set_time(struct device *dev, struct rtc_time *tm) 65fd507e2fSAlessandro Zummo { 6600c33482SNikita Shubin struct ep93xx_rtc *ep93xx_rtc = dev_get_drvdata(dev); 67ef9440a2SAlexandre Belloni unsigned long secs = rtc_tm_to_time64(tm); 6838f7b009SHartley Sweeten 69ff32ff17SH Hartley Sweeten writel(secs + 1, ep93xx_rtc->mmio_base + EP93XX_RTC_LOAD); 70fd507e2fSAlessandro Zummo return 0; 71fd507e2fSAlessandro Zummo } 72fd507e2fSAlessandro Zummo 73fd507e2fSAlessandro Zummo static int ep93xx_rtc_proc(struct device *dev, struct seq_file *seq) 74fd507e2fSAlessandro Zummo { 75fd507e2fSAlessandro Zummo unsigned short preload, delete; 76fd507e2fSAlessandro Zummo 7738f7b009SHartley Sweeten ep93xx_rtc_get_swcomp(dev, &preload, &delete); 78fd507e2fSAlessandro Zummo 79fd507e2fSAlessandro Zummo seq_printf(seq, "preload\t\t: %d\n", preload); 80fd507e2fSAlessandro Zummo seq_printf(seq, "delete\t\t: %d\n", delete); 81fd507e2fSAlessandro Zummo 82fd507e2fSAlessandro Zummo return 0; 83fd507e2fSAlessandro Zummo } 84fd507e2fSAlessandro Zummo 85ff8371acSDavid Brownell static const struct rtc_class_ops ep93xx_rtc_ops = { 86fd507e2fSAlessandro Zummo .read_time = ep93xx_rtc_read_time, 87ef9440a2SAlexandre Belloni .set_time = ep93xx_rtc_set_time, 88fd507e2fSAlessandro Zummo .proc = ep93xx_rtc_proc, 89fd507e2fSAlessandro Zummo }; 90fd507e2fSAlessandro Zummo 91d71c7715SAlexandre Belloni static ssize_t comp_preload_show(struct device *dev, 92fd507e2fSAlessandro Zummo struct device_attribute *attr, char *buf) 93fd507e2fSAlessandro Zummo { 94fd507e2fSAlessandro Zummo unsigned short preload; 95fd507e2fSAlessandro Zummo 9609cd030bSAlexandre Belloni ep93xx_rtc_get_swcomp(dev->parent, &preload, NULL); 97fd507e2fSAlessandro Zummo 98fd507e2fSAlessandro Zummo return sprintf(buf, "%d\n", preload); 99fd507e2fSAlessandro Zummo } 100d71c7715SAlexandre Belloni static DEVICE_ATTR_RO(comp_preload); 101fd507e2fSAlessandro Zummo 102d71c7715SAlexandre Belloni static ssize_t comp_delete_show(struct device *dev, 103fd507e2fSAlessandro Zummo struct device_attribute *attr, char *buf) 104fd507e2fSAlessandro Zummo { 105fd507e2fSAlessandro Zummo unsigned short delete; 106fd507e2fSAlessandro Zummo 10709cd030bSAlexandre Belloni ep93xx_rtc_get_swcomp(dev->parent, NULL, &delete); 108fd507e2fSAlessandro Zummo 109fd507e2fSAlessandro Zummo return sprintf(buf, "%d\n", delete); 110fd507e2fSAlessandro Zummo } 111d71c7715SAlexandre Belloni static DEVICE_ATTR_RO(comp_delete); 112fd507e2fSAlessandro Zummo 113b4877d2bSH Hartley Sweeten static struct attribute *ep93xx_rtc_attrs[] = { 114b4877d2bSH Hartley Sweeten &dev_attr_comp_preload.attr, 115b4877d2bSH Hartley Sweeten &dev_attr_comp_delete.attr, 116b4877d2bSH Hartley Sweeten NULL 117b4877d2bSH Hartley Sweeten }; 118b4877d2bSH Hartley Sweeten 119b4877d2bSH Hartley Sweeten static const struct attribute_group ep93xx_rtc_sysfs_files = { 120b4877d2bSH Hartley Sweeten .attrs = ep93xx_rtc_attrs, 121b4877d2bSH Hartley Sweeten }; 122fd507e2fSAlessandro Zummo 1235a167f45SGreg Kroah-Hartman static int ep93xx_rtc_probe(struct platform_device *pdev) 124fd507e2fSAlessandro Zummo { 12538f7b009SHartley Sweeten struct ep93xx_rtc *ep93xx_rtc; 12638f7b009SHartley Sweeten int err; 127fd507e2fSAlessandro Zummo 128b4877d2bSH Hartley Sweeten ep93xx_rtc = devm_kzalloc(&pdev->dev, sizeof(*ep93xx_rtc), GFP_KERNEL); 129b4877d2bSH Hartley Sweeten if (!ep93xx_rtc) 13038f7b009SHartley Sweeten return -ENOMEM; 13138f7b009SHartley Sweeten 13209ef18bcSYueHaibing ep93xx_rtc->mmio_base = devm_platform_ioremap_resource(pdev, 0); 1337c1d69eeSJulia Lawall if (IS_ERR(ep93xx_rtc->mmio_base)) 1347c1d69eeSJulia Lawall return PTR_ERR(ep93xx_rtc->mmio_base); 135fd507e2fSAlessandro Zummo 136bf6ed027SAxel Lin platform_set_drvdata(pdev, ep93xx_rtc); 137fd507e2fSAlessandro Zummo 138bac68b30SAlexandre Belloni ep93xx_rtc->rtc = devm_rtc_allocate_device(&pdev->dev); 139b809d192SAlexandre Belloni if (IS_ERR(ep93xx_rtc->rtc)) 140b809d192SAlexandre Belloni return PTR_ERR(ep93xx_rtc->rtc); 14138f7b009SHartley Sweeten 142bac68b30SAlexandre Belloni ep93xx_rtc->rtc->ops = &ep93xx_rtc_ops; 1432d4fc6dfSAlexandre Belloni ep93xx_rtc->rtc->range_max = U32_MAX; 144bac68b30SAlexandre Belloni 14509cd030bSAlexandre Belloni err = rtc_add_group(ep93xx_rtc->rtc, &ep93xx_rtc_sysfs_files); 146bac68b30SAlexandre Belloni if (err) 147bac68b30SAlexandre Belloni return err; 148bac68b30SAlexandre Belloni 149fdcfd854SBartosz Golaszewski return devm_rtc_register_device(ep93xx_rtc->rtc); 150fd507e2fSAlessandro Zummo } 151fd507e2fSAlessandro Zummo 152*1d70f9feSNikita Shubin static const struct of_device_id ep93xx_rtc_of_ids[] = { 153*1d70f9feSNikita Shubin { .compatible = "cirrus,ep9301-rtc" }, 154*1d70f9feSNikita Shubin { /* sentinel */ } 155*1d70f9feSNikita Shubin }; 156*1d70f9feSNikita Shubin MODULE_DEVICE_TABLE(of, ep93xx_rtc_of_ids); 157*1d70f9feSNikita Shubin 15838f7b009SHartley Sweeten static struct platform_driver ep93xx_rtc_driver = { 159fd507e2fSAlessandro Zummo .driver = { 160fd507e2fSAlessandro Zummo .name = "ep93xx-rtc", 161*1d70f9feSNikita Shubin .of_match_table = ep93xx_rtc_of_ids, 162fd507e2fSAlessandro Zummo }, 16384d56b38SH Hartley Sweeten .probe = ep93xx_rtc_probe, 164fd507e2fSAlessandro Zummo }; 165fd507e2fSAlessandro Zummo 16684d56b38SH Hartley Sweeten module_platform_driver(ep93xx_rtc_driver); 167fd507e2fSAlessandro Zummo 168fd507e2fSAlessandro Zummo MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); 169fd507e2fSAlessandro Zummo MODULE_DESCRIPTION("EP93XX RTC driver"); 170fd507e2fSAlessandro Zummo MODULE_LICENSE("GPL"); 17184d56b38SH Hartley Sweeten MODULE_ALIAS("platform:ep93xx-rtc"); 172