1*4fdf4d23SAlexandre 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> 10fd507e2fSAlessandro Zummo #include <linux/rtc.h> 11fd507e2fSAlessandro Zummo #include <linux/platform_device.h> 1238f7b009SHartley Sweeten #include <linux/io.h> 135a0e3ad6STejun Heo #include <linux/gfp.h> 14fd507e2fSAlessandro Zummo 1538f7b009SHartley Sweeten #define EP93XX_RTC_DATA 0x000 1638f7b009SHartley Sweeten #define EP93XX_RTC_MATCH 0x004 1738f7b009SHartley Sweeten #define EP93XX_RTC_STATUS 0x008 1838f7b009SHartley Sweeten #define EP93XX_RTC_STATUS_INTR (1<<0) 1938f7b009SHartley Sweeten #define EP93XX_RTC_LOAD 0x00C 2038f7b009SHartley Sweeten #define EP93XX_RTC_CONTROL 0x010 2138f7b009SHartley Sweeten #define EP93XX_RTC_CONTROL_MIE (1<<0) 2238f7b009SHartley Sweeten #define EP93XX_RTC_SWCOMP 0x108 2338f7b009SHartley Sweeten #define EP93XX_RTC_SWCOMP_DEL_MASK 0x001f0000 2438f7b009SHartley Sweeten #define EP93XX_RTC_SWCOMP_DEL_SHIFT 16 2538f7b009SHartley Sweeten #define EP93XX_RTC_SWCOMP_INT_MASK 0x0000ffff 2638f7b009SHartley Sweeten #define EP93XX_RTC_SWCOMP_INT_SHIFT 0 27fd507e2fSAlessandro Zummo 2838f7b009SHartley Sweeten struct ep93xx_rtc { 2938f7b009SHartley Sweeten void __iomem *mmio_base; 30bf6ed027SAxel Lin struct rtc_device *rtc; 3138f7b009SHartley Sweeten }; 3238f7b009SHartley Sweeten 3338f7b009SHartley Sweeten static int ep93xx_rtc_get_swcomp(struct device *dev, unsigned short *preload, 34fd507e2fSAlessandro Zummo unsigned short *delete) 35fd507e2fSAlessandro Zummo { 3628dc5f80SJingoo Han struct ep93xx_rtc *ep93xx_rtc = dev_get_platdata(dev); 3738f7b009SHartley Sweeten unsigned long comp; 3838f7b009SHartley Sweeten 39ff32ff17SH Hartley Sweeten comp = readl(ep93xx_rtc->mmio_base + EP93XX_RTC_SWCOMP); 40fd507e2fSAlessandro Zummo 41fd507e2fSAlessandro Zummo if (preload) 4238f7b009SHartley Sweeten *preload = (comp & EP93XX_RTC_SWCOMP_INT_MASK) 4338f7b009SHartley Sweeten >> EP93XX_RTC_SWCOMP_INT_SHIFT; 44fd507e2fSAlessandro Zummo 45fd507e2fSAlessandro Zummo if (delete) 4638f7b009SHartley Sweeten *delete = (comp & EP93XX_RTC_SWCOMP_DEL_MASK) 4738f7b009SHartley Sweeten >> EP93XX_RTC_SWCOMP_DEL_SHIFT; 48fd507e2fSAlessandro Zummo 49fd507e2fSAlessandro Zummo return 0; 50fd507e2fSAlessandro Zummo } 51fd507e2fSAlessandro Zummo 52fd507e2fSAlessandro Zummo static int ep93xx_rtc_read_time(struct device *dev, struct rtc_time *tm) 53fd507e2fSAlessandro Zummo { 5428dc5f80SJingoo Han struct ep93xx_rtc *ep93xx_rtc = dev_get_platdata(dev); 5538f7b009SHartley Sweeten unsigned long time; 5638f7b009SHartley Sweeten 57ff32ff17SH Hartley Sweeten time = readl(ep93xx_rtc->mmio_base + EP93XX_RTC_DATA); 58fd507e2fSAlessandro Zummo 59886a77e7SAlexandre Belloni rtc_time64_to_tm(time, tm); 60fd507e2fSAlessandro Zummo return 0; 61fd507e2fSAlessandro Zummo } 62fd507e2fSAlessandro Zummo 63ef9440a2SAlexandre Belloni static int ep93xx_rtc_set_time(struct device *dev, struct rtc_time *tm) 64fd507e2fSAlessandro Zummo { 6528dc5f80SJingoo Han struct ep93xx_rtc *ep93xx_rtc = dev_get_platdata(dev); 66ef9440a2SAlexandre Belloni unsigned long secs = rtc_tm_to_time64(tm); 6738f7b009SHartley Sweeten 68ff32ff17SH Hartley Sweeten writel(secs + 1, ep93xx_rtc->mmio_base + EP93XX_RTC_LOAD); 69fd507e2fSAlessandro Zummo return 0; 70fd507e2fSAlessandro Zummo } 71fd507e2fSAlessandro Zummo 72fd507e2fSAlessandro Zummo static int ep93xx_rtc_proc(struct device *dev, struct seq_file *seq) 73fd507e2fSAlessandro Zummo { 74fd507e2fSAlessandro Zummo unsigned short preload, delete; 75fd507e2fSAlessandro Zummo 7638f7b009SHartley Sweeten ep93xx_rtc_get_swcomp(dev, &preload, &delete); 77fd507e2fSAlessandro Zummo 78fd507e2fSAlessandro Zummo seq_printf(seq, "preload\t\t: %d\n", preload); 79fd507e2fSAlessandro Zummo seq_printf(seq, "delete\t\t: %d\n", delete); 80fd507e2fSAlessandro Zummo 81fd507e2fSAlessandro Zummo return 0; 82fd507e2fSAlessandro Zummo } 83fd507e2fSAlessandro Zummo 84ff8371acSDavid Brownell static const struct rtc_class_ops ep93xx_rtc_ops = { 85fd507e2fSAlessandro Zummo .read_time = ep93xx_rtc_read_time, 86ef9440a2SAlexandre Belloni .set_time = ep93xx_rtc_set_time, 87fd507e2fSAlessandro Zummo .proc = ep93xx_rtc_proc, 88fd507e2fSAlessandro Zummo }; 89fd507e2fSAlessandro Zummo 9038f7b009SHartley Sweeten static ssize_t ep93xx_rtc_show_comp_preload(struct device *dev, 91fd507e2fSAlessandro Zummo struct device_attribute *attr, char *buf) 92fd507e2fSAlessandro Zummo { 93fd507e2fSAlessandro Zummo unsigned short preload; 94fd507e2fSAlessandro Zummo 9509cd030bSAlexandre Belloni ep93xx_rtc_get_swcomp(dev->parent, &preload, NULL); 96fd507e2fSAlessandro Zummo 97fd507e2fSAlessandro Zummo return sprintf(buf, "%d\n", preload); 98fd507e2fSAlessandro Zummo } 9938f7b009SHartley Sweeten static DEVICE_ATTR(comp_preload, S_IRUGO, ep93xx_rtc_show_comp_preload, NULL); 100fd507e2fSAlessandro Zummo 10138f7b009SHartley Sweeten static ssize_t ep93xx_rtc_show_comp_delete(struct device *dev, 102fd507e2fSAlessandro Zummo struct device_attribute *attr, char *buf) 103fd507e2fSAlessandro Zummo { 104fd507e2fSAlessandro Zummo unsigned short delete; 105fd507e2fSAlessandro Zummo 10609cd030bSAlexandre Belloni ep93xx_rtc_get_swcomp(dev->parent, NULL, &delete); 107fd507e2fSAlessandro Zummo 108fd507e2fSAlessandro Zummo return sprintf(buf, "%d\n", delete); 109fd507e2fSAlessandro Zummo } 11038f7b009SHartley Sweeten static DEVICE_ATTR(comp_delete, S_IRUGO, ep93xx_rtc_show_comp_delete, NULL); 111fd507e2fSAlessandro Zummo 112b4877d2bSH Hartley Sweeten static struct attribute *ep93xx_rtc_attrs[] = { 113b4877d2bSH Hartley Sweeten &dev_attr_comp_preload.attr, 114b4877d2bSH Hartley Sweeten &dev_attr_comp_delete.attr, 115b4877d2bSH Hartley Sweeten NULL 116b4877d2bSH Hartley Sweeten }; 117b4877d2bSH Hartley Sweeten 118b4877d2bSH Hartley Sweeten static const struct attribute_group ep93xx_rtc_sysfs_files = { 119b4877d2bSH Hartley Sweeten .attrs = ep93xx_rtc_attrs, 120b4877d2bSH Hartley Sweeten }; 121fd507e2fSAlessandro Zummo 1225a167f45SGreg Kroah-Hartman static int ep93xx_rtc_probe(struct platform_device *pdev) 123fd507e2fSAlessandro Zummo { 12438f7b009SHartley Sweeten struct ep93xx_rtc *ep93xx_rtc; 12538f7b009SHartley Sweeten struct resource *res; 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 13238f7b009SHartley Sweeten res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1337c1d69eeSJulia Lawall ep93xx_rtc->mmio_base = devm_ioremap_resource(&pdev->dev, res); 1347c1d69eeSJulia Lawall if (IS_ERR(ep93xx_rtc->mmio_base)) 1357c1d69eeSJulia Lawall return PTR_ERR(ep93xx_rtc->mmio_base); 136fd507e2fSAlessandro Zummo 137bf6ed027SAxel Lin platform_set_drvdata(pdev, ep93xx_rtc); 138fd507e2fSAlessandro Zummo 139bac68b30SAlexandre Belloni ep93xx_rtc->rtc = devm_rtc_allocate_device(&pdev->dev); 140b809d192SAlexandre Belloni if (IS_ERR(ep93xx_rtc->rtc)) 141b809d192SAlexandre Belloni return PTR_ERR(ep93xx_rtc->rtc); 14238f7b009SHartley Sweeten 143bac68b30SAlexandre Belloni ep93xx_rtc->rtc->ops = &ep93xx_rtc_ops; 1442d4fc6dfSAlexandre Belloni ep93xx_rtc->rtc->range_max = U32_MAX; 145bac68b30SAlexandre Belloni 14609cd030bSAlexandre Belloni err = rtc_add_group(ep93xx_rtc->rtc, &ep93xx_rtc_sysfs_files); 147bac68b30SAlexandre Belloni if (err) 148bac68b30SAlexandre Belloni return err; 149bac68b30SAlexandre Belloni 15009cd030bSAlexandre Belloni return rtc_register_device(ep93xx_rtc->rtc); 151fd507e2fSAlessandro Zummo } 152fd507e2fSAlessandro Zummo 15338f7b009SHartley Sweeten static struct platform_driver ep93xx_rtc_driver = { 154fd507e2fSAlessandro Zummo .driver = { 155fd507e2fSAlessandro Zummo .name = "ep93xx-rtc", 156fd507e2fSAlessandro Zummo }, 15784d56b38SH Hartley Sweeten .probe = ep93xx_rtc_probe, 158fd507e2fSAlessandro Zummo }; 159fd507e2fSAlessandro Zummo 16084d56b38SH Hartley Sweeten module_platform_driver(ep93xx_rtc_driver); 161fd507e2fSAlessandro Zummo 162fd507e2fSAlessandro Zummo MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); 163fd507e2fSAlessandro Zummo MODULE_DESCRIPTION("EP93XX RTC driver"); 164fd507e2fSAlessandro Zummo MODULE_LICENSE("GPL"); 16584d56b38SH Hartley Sweeten MODULE_ALIAS("platform:ep93xx-rtc"); 166