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![Nobuhiro Iwamatsu](/assets/img/avatar_default.png)
For C files, use the C99 format (//). Signed-off-by: Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp> Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com> Link: https://lore.kernel.org/r/20210707075804.337458-7-nobuhiro1.iwamatsu@toshiba.co.jp
239 lines
5.6 KiB
C
239 lines
5.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Realtek RTD129x RTC
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*
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* Copyright (c) 2017 Andreas Färber
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*/
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#include <linux/clk.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/platform_device.h>
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#include <linux/rtc.h>
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#include <linux/spinlock.h>
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#define RTD_RTCSEC 0x00
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#define RTD_RTCMIN 0x04
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#define RTD_RTCHR 0x08
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#define RTD_RTCDATE1 0x0c
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#define RTD_RTCDATE2 0x10
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#define RTD_RTCACR 0x28
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#define RTD_RTCEN 0x2c
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#define RTD_RTCCR 0x30
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#define RTD_RTCSEC_RTCSEC_MASK 0x7f
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#define RTD_RTCMIN_RTCMIN_MASK 0x3f
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#define RTD_RTCHR_RTCHR_MASK 0x1f
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#define RTD_RTCDATE1_RTCDATE1_MASK 0xff
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#define RTD_RTCDATE2_RTCDATE2_MASK 0x7f
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#define RTD_RTCACR_RTCPWR BIT(7)
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#define RTD_RTCEN_RTCEN_MASK 0xff
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#define RTD_RTCCR_RTCRST BIT(6)
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struct rtd119x_rtc {
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void __iomem *base;
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struct clk *clk;
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struct rtc_device *rtcdev;
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unsigned int base_year;
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};
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static inline int rtd119x_rtc_days_in_year(int year)
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{
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return 365 + (is_leap_year(year) ? 1 : 0);
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}
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static void rtd119x_rtc_reset(struct device *dev)
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{
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struct rtd119x_rtc *data = dev_get_drvdata(dev);
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u32 val;
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val = readl_relaxed(data->base + RTD_RTCCR);
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val |= RTD_RTCCR_RTCRST;
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writel_relaxed(val, data->base + RTD_RTCCR);
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val &= ~RTD_RTCCR_RTCRST;
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writel(val, data->base + RTD_RTCCR);
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}
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static void rtd119x_rtc_set_enabled(struct device *dev, bool enable)
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{
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struct rtd119x_rtc *data = dev_get_drvdata(dev);
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u32 val;
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val = readl_relaxed(data->base + RTD_RTCEN);
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if (enable) {
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if ((val & RTD_RTCEN_RTCEN_MASK) == 0x5a)
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return;
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writel_relaxed(0x5a, data->base + RTD_RTCEN);
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} else {
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writel_relaxed(0, data->base + RTD_RTCEN);
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}
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}
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static int rtd119x_rtc_read_time(struct device *dev, struct rtc_time *tm)
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{
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struct rtd119x_rtc *data = dev_get_drvdata(dev);
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s32 day;
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u32 sec;
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unsigned int year;
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int tries = 0;
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while (true) {
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tm->tm_sec = (readl_relaxed(data->base + RTD_RTCSEC) & RTD_RTCSEC_RTCSEC_MASK) >> 1;
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tm->tm_min = readl_relaxed(data->base + RTD_RTCMIN) & RTD_RTCMIN_RTCMIN_MASK;
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tm->tm_hour = readl_relaxed(data->base + RTD_RTCHR) & RTD_RTCHR_RTCHR_MASK;
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day = readl_relaxed(data->base + RTD_RTCDATE1) & RTD_RTCDATE1_RTCDATE1_MASK;
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day |= (readl_relaxed(data->base + RTD_RTCDATE2) & RTD_RTCDATE2_RTCDATE2_MASK) << 8;
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sec = (readl_relaxed(data->base + RTD_RTCSEC) & RTD_RTCSEC_RTCSEC_MASK) >> 1;
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tries++;
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if (sec == tm->tm_sec)
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break;
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if (tries >= 3)
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return -EINVAL;
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}
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if (tries > 1)
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dev_dbg(dev, "%s: needed %i tries\n", __func__, tries);
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year = data->base_year;
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while (day >= rtd119x_rtc_days_in_year(year)) {
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day -= rtd119x_rtc_days_in_year(year);
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year++;
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}
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tm->tm_year = year - 1900;
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tm->tm_yday = day;
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tm->tm_mon = 0;
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while (day >= rtc_month_days(tm->tm_mon, year)) {
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day -= rtc_month_days(tm->tm_mon, year);
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tm->tm_mon++;
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}
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tm->tm_mday = day + 1;
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return 0;
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}
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static int rtd119x_rtc_set_time(struct device *dev, struct rtc_time *tm)
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{
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struct rtd119x_rtc *data = dev_get_drvdata(dev);
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unsigned int day;
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int i;
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if (1900 + tm->tm_year < data->base_year)
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return -EINVAL;
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day = 0;
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for (i = data->base_year; i < 1900 + tm->tm_year; i++)
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day += rtd119x_rtc_days_in_year(i);
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day += tm->tm_yday;
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if (day > 0x7fff)
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return -EINVAL;
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rtd119x_rtc_set_enabled(dev, false);
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writel_relaxed((tm->tm_sec << 1) & RTD_RTCSEC_RTCSEC_MASK, data->base + RTD_RTCSEC);
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writel_relaxed(tm->tm_min & RTD_RTCMIN_RTCMIN_MASK, data->base + RTD_RTCMIN);
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writel_relaxed(tm->tm_hour & RTD_RTCHR_RTCHR_MASK, data->base + RTD_RTCHR);
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writel_relaxed(day & RTD_RTCDATE1_RTCDATE1_MASK, data->base + RTD_RTCDATE1);
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writel_relaxed((day >> 8) & RTD_RTCDATE2_RTCDATE2_MASK, data->base + RTD_RTCDATE2);
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rtd119x_rtc_set_enabled(dev, true);
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return 0;
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}
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static const struct rtc_class_ops rtd119x_rtc_ops = {
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.read_time = rtd119x_rtc_read_time,
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.set_time = rtd119x_rtc_set_time,
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};
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static const struct of_device_id rtd119x_rtc_dt_ids[] = {
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{ .compatible = "realtek,rtd1295-rtc" },
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{ }
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};
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static int rtd119x_rtc_probe(struct platform_device *pdev)
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{
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struct rtd119x_rtc *data;
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u32 val;
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int ret;
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data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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platform_set_drvdata(pdev, data);
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data->base_year = 2014;
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data->base = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(data->base))
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return PTR_ERR(data->base);
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data->clk = of_clk_get(pdev->dev.of_node, 0);
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if (IS_ERR(data->clk))
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return PTR_ERR(data->clk);
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ret = clk_prepare_enable(data->clk);
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if (ret) {
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clk_put(data->clk);
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return ret;
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}
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val = readl_relaxed(data->base + RTD_RTCACR);
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if (!(val & RTD_RTCACR_RTCPWR)) {
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writel_relaxed(RTD_RTCACR_RTCPWR, data->base + RTD_RTCACR);
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rtd119x_rtc_reset(&pdev->dev);
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writel_relaxed(0, data->base + RTD_RTCMIN);
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writel_relaxed(0, data->base + RTD_RTCHR);
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writel_relaxed(0, data->base + RTD_RTCDATE1);
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writel_relaxed(0, data->base + RTD_RTCDATE2);
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}
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rtd119x_rtc_set_enabled(&pdev->dev, true);
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data->rtcdev = devm_rtc_device_register(&pdev->dev, "rtc",
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&rtd119x_rtc_ops, THIS_MODULE);
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if (IS_ERR(data->rtcdev)) {
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dev_err(&pdev->dev, "failed to register rtc device");
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clk_disable_unprepare(data->clk);
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clk_put(data->clk);
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return PTR_ERR(data->rtcdev);
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}
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return 0;
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}
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static int rtd119x_rtc_remove(struct platform_device *pdev)
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{
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struct rtd119x_rtc *data = platform_get_drvdata(pdev);
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rtd119x_rtc_set_enabled(&pdev->dev, false);
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clk_disable_unprepare(data->clk);
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clk_put(data->clk);
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return 0;
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}
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static struct platform_driver rtd119x_rtc_driver = {
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.probe = rtd119x_rtc_probe,
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.remove = rtd119x_rtc_remove,
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.driver = {
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.name = "rtd1295-rtc",
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.of_match_table = rtd119x_rtc_dt_ids,
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},
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};
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builtin_platform_driver(rtd119x_rtc_driver);
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