164 lines
4.0 KiB
C
164 lines
4.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* A driver for the RTC embedded in the Cirrus Logic EP93XX processors
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* Copyright (c) 2006 Tower Technologies
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*
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* Author: Alessandro Zummo <a.zummo@towertech.it>
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*/
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#include <linux/module.h>
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#include <linux/rtc.h>
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#include <linux/platform_device.h>
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#include <linux/io.h>
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#include <linux/gfp.h>
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#define EP93XX_RTC_DATA 0x000
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#define EP93XX_RTC_MATCH 0x004
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#define EP93XX_RTC_STATUS 0x008
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#define EP93XX_RTC_STATUS_INTR BIT(0)
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#define EP93XX_RTC_LOAD 0x00C
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#define EP93XX_RTC_CONTROL 0x010
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#define EP93XX_RTC_CONTROL_MIE BIT(0)
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#define EP93XX_RTC_SWCOMP 0x108
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#define EP93XX_RTC_SWCOMP_DEL_MASK 0x001f0000
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#define EP93XX_RTC_SWCOMP_DEL_SHIFT 16
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#define EP93XX_RTC_SWCOMP_INT_MASK 0x0000ffff
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#define EP93XX_RTC_SWCOMP_INT_SHIFT 0
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struct ep93xx_rtc {
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void __iomem *mmio_base;
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struct rtc_device *rtc;
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};
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static int ep93xx_rtc_get_swcomp(struct device *dev, unsigned short *preload,
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unsigned short *delete)
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{
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struct ep93xx_rtc *ep93xx_rtc = dev_get_drvdata(dev);
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unsigned long comp;
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comp = readl(ep93xx_rtc->mmio_base + EP93XX_RTC_SWCOMP);
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if (preload)
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*preload = (comp & EP93XX_RTC_SWCOMP_INT_MASK)
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>> EP93XX_RTC_SWCOMP_INT_SHIFT;
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if (delete)
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*delete = (comp & EP93XX_RTC_SWCOMP_DEL_MASK)
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>> EP93XX_RTC_SWCOMP_DEL_SHIFT;
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return 0;
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}
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static int ep93xx_rtc_read_time(struct device *dev, struct rtc_time *tm)
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{
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struct ep93xx_rtc *ep93xx_rtc = dev_get_drvdata(dev);
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unsigned long time;
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time = readl(ep93xx_rtc->mmio_base + EP93XX_RTC_DATA);
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rtc_time64_to_tm(time, tm);
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return 0;
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}
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static int ep93xx_rtc_set_time(struct device *dev, struct rtc_time *tm)
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{
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struct ep93xx_rtc *ep93xx_rtc = dev_get_drvdata(dev);
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unsigned long secs = rtc_tm_to_time64(tm);
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writel(secs + 1, ep93xx_rtc->mmio_base + EP93XX_RTC_LOAD);
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return 0;
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}
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static int ep93xx_rtc_proc(struct device *dev, struct seq_file *seq)
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{
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unsigned short preload, delete;
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ep93xx_rtc_get_swcomp(dev, &preload, &delete);
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seq_printf(seq, "preload\t\t: %d\n", preload);
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seq_printf(seq, "delete\t\t: %d\n", delete);
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return 0;
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}
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static const struct rtc_class_ops ep93xx_rtc_ops = {
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.read_time = ep93xx_rtc_read_time,
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.set_time = ep93xx_rtc_set_time,
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.proc = ep93xx_rtc_proc,
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};
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static ssize_t comp_preload_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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unsigned short preload;
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ep93xx_rtc_get_swcomp(dev->parent, &preload, NULL);
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return sprintf(buf, "%d\n", preload);
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}
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static DEVICE_ATTR_RO(comp_preload);
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static ssize_t comp_delete_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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unsigned short delete;
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ep93xx_rtc_get_swcomp(dev->parent, NULL, &delete);
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return sprintf(buf, "%d\n", delete);
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}
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static DEVICE_ATTR_RO(comp_delete);
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static struct attribute *ep93xx_rtc_attrs[] = {
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&dev_attr_comp_preload.attr,
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&dev_attr_comp_delete.attr,
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NULL
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};
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static const struct attribute_group ep93xx_rtc_sysfs_files = {
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.attrs = ep93xx_rtc_attrs,
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};
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static int ep93xx_rtc_probe(struct platform_device *pdev)
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{
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struct ep93xx_rtc *ep93xx_rtc;
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int err;
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ep93xx_rtc = devm_kzalloc(&pdev->dev, sizeof(*ep93xx_rtc), GFP_KERNEL);
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if (!ep93xx_rtc)
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return -ENOMEM;
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ep93xx_rtc->mmio_base = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(ep93xx_rtc->mmio_base))
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return PTR_ERR(ep93xx_rtc->mmio_base);
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platform_set_drvdata(pdev, ep93xx_rtc);
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ep93xx_rtc->rtc = devm_rtc_allocate_device(&pdev->dev);
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if (IS_ERR(ep93xx_rtc->rtc))
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return PTR_ERR(ep93xx_rtc->rtc);
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ep93xx_rtc->rtc->ops = &ep93xx_rtc_ops;
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ep93xx_rtc->rtc->range_max = U32_MAX;
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err = rtc_add_group(ep93xx_rtc->rtc, &ep93xx_rtc_sysfs_files);
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if (err)
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return err;
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return devm_rtc_register_device(ep93xx_rtc->rtc);
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}
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static struct platform_driver ep93xx_rtc_driver = {
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.driver = {
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.name = "ep93xx-rtc",
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},
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.probe = ep93xx_rtc_probe,
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};
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module_platform_driver(ep93xx_rtc_driver);
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MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
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MODULE_DESCRIPTION("EP93XX RTC driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:ep93xx-rtc");
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