320 lines
8.3 KiB
C
320 lines
8.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Driver for the RTC in Marvell SoCs.
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/rtc.h>
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#include <linux/bcd.h>
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#include <linux/bitops.h>
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#include <linux/io.h>
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#include <linux/platform_device.h>
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#include <linux/of.h>
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#include <linux/delay.h>
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#include <linux/clk.h>
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#include <linux/gfp.h>
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#include <linux/module.h>
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#define RTC_TIME_REG_OFFS 0
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#define RTC_SECONDS_OFFS 0
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#define RTC_MINUTES_OFFS 8
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#define RTC_HOURS_OFFS 16
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#define RTC_WDAY_OFFS 24
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#define RTC_HOURS_12H_MODE BIT(22) /* 12 hour mode */
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#define RTC_DATE_REG_OFFS 4
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#define RTC_MDAY_OFFS 0
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#define RTC_MONTH_OFFS 8
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#define RTC_YEAR_OFFS 16
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#define RTC_ALARM_TIME_REG_OFFS 8
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#define RTC_ALARM_DATE_REG_OFFS 0xc
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#define RTC_ALARM_VALID BIT(7)
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#define RTC_ALARM_INTERRUPT_MASK_REG_OFFS 0x10
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#define RTC_ALARM_INTERRUPT_CASUE_REG_OFFS 0x14
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struct rtc_plat_data {
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struct rtc_device *rtc;
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void __iomem *ioaddr;
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int irq;
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struct clk *clk;
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};
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static int mv_rtc_set_time(struct device *dev, struct rtc_time *tm)
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{
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struct rtc_plat_data *pdata = dev_get_drvdata(dev);
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void __iomem *ioaddr = pdata->ioaddr;
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u32 rtc_reg;
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rtc_reg = (bin2bcd(tm->tm_sec) << RTC_SECONDS_OFFS) |
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(bin2bcd(tm->tm_min) << RTC_MINUTES_OFFS) |
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(bin2bcd(tm->tm_hour) << RTC_HOURS_OFFS) |
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(bin2bcd(tm->tm_wday) << RTC_WDAY_OFFS);
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writel(rtc_reg, ioaddr + RTC_TIME_REG_OFFS);
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rtc_reg = (bin2bcd(tm->tm_mday) << RTC_MDAY_OFFS) |
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(bin2bcd(tm->tm_mon + 1) << RTC_MONTH_OFFS) |
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(bin2bcd(tm->tm_year - 100) << RTC_YEAR_OFFS);
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writel(rtc_reg, ioaddr + RTC_DATE_REG_OFFS);
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return 0;
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}
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static int mv_rtc_read_time(struct device *dev, struct rtc_time *tm)
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{
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struct rtc_plat_data *pdata = dev_get_drvdata(dev);
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void __iomem *ioaddr = pdata->ioaddr;
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u32 rtc_time, rtc_date;
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unsigned int year, month, day, hour, minute, second, wday;
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rtc_time = readl(ioaddr + RTC_TIME_REG_OFFS);
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rtc_date = readl(ioaddr + RTC_DATE_REG_OFFS);
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second = rtc_time & 0x7f;
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minute = (rtc_time >> RTC_MINUTES_OFFS) & 0x7f;
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hour = (rtc_time >> RTC_HOURS_OFFS) & 0x3f; /* assume 24 hour mode */
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wday = (rtc_time >> RTC_WDAY_OFFS) & 0x7;
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day = rtc_date & 0x3f;
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month = (rtc_date >> RTC_MONTH_OFFS) & 0x3f;
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year = (rtc_date >> RTC_YEAR_OFFS) & 0xff;
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tm->tm_sec = bcd2bin(second);
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tm->tm_min = bcd2bin(minute);
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tm->tm_hour = bcd2bin(hour);
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tm->tm_mday = bcd2bin(day);
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tm->tm_wday = bcd2bin(wday);
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tm->tm_mon = bcd2bin(month) - 1;
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/* hw counts from year 2000, but tm_year is relative to 1900 */
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tm->tm_year = bcd2bin(year) + 100;
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return 0;
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}
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static int mv_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
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{
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struct rtc_plat_data *pdata = dev_get_drvdata(dev);
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void __iomem *ioaddr = pdata->ioaddr;
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u32 rtc_time, rtc_date;
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unsigned int year, month, day, hour, minute, second, wday;
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rtc_time = readl(ioaddr + RTC_ALARM_TIME_REG_OFFS);
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rtc_date = readl(ioaddr + RTC_ALARM_DATE_REG_OFFS);
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second = rtc_time & 0x7f;
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minute = (rtc_time >> RTC_MINUTES_OFFS) & 0x7f;
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hour = (rtc_time >> RTC_HOURS_OFFS) & 0x3f; /* assume 24 hour mode */
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wday = (rtc_time >> RTC_WDAY_OFFS) & 0x7;
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day = rtc_date & 0x3f;
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month = (rtc_date >> RTC_MONTH_OFFS) & 0x3f;
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year = (rtc_date >> RTC_YEAR_OFFS) & 0xff;
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alm->time.tm_sec = bcd2bin(second);
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alm->time.tm_min = bcd2bin(minute);
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alm->time.tm_hour = bcd2bin(hour);
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alm->time.tm_mday = bcd2bin(day);
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alm->time.tm_wday = bcd2bin(wday);
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alm->time.tm_mon = bcd2bin(month) - 1;
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/* hw counts from year 2000, but tm_year is relative to 1900 */
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alm->time.tm_year = bcd2bin(year) + 100;
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alm->enabled = !!readl(ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
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return rtc_valid_tm(&alm->time);
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}
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static int mv_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
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{
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struct rtc_plat_data *pdata = dev_get_drvdata(dev);
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void __iomem *ioaddr = pdata->ioaddr;
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u32 rtc_reg = 0;
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if (alm->time.tm_sec >= 0)
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rtc_reg |= (RTC_ALARM_VALID | bin2bcd(alm->time.tm_sec))
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<< RTC_SECONDS_OFFS;
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if (alm->time.tm_min >= 0)
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rtc_reg |= (RTC_ALARM_VALID | bin2bcd(alm->time.tm_min))
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<< RTC_MINUTES_OFFS;
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if (alm->time.tm_hour >= 0)
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rtc_reg |= (RTC_ALARM_VALID | bin2bcd(alm->time.tm_hour))
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<< RTC_HOURS_OFFS;
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writel(rtc_reg, ioaddr + RTC_ALARM_TIME_REG_OFFS);
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if (alm->time.tm_mday >= 0)
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rtc_reg = (RTC_ALARM_VALID | bin2bcd(alm->time.tm_mday))
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<< RTC_MDAY_OFFS;
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else
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rtc_reg = 0;
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if (alm->time.tm_mon >= 0)
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rtc_reg |= (RTC_ALARM_VALID | bin2bcd(alm->time.tm_mon + 1))
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<< RTC_MONTH_OFFS;
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if (alm->time.tm_year >= 0)
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rtc_reg |= (RTC_ALARM_VALID | bin2bcd(alm->time.tm_year - 100))
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<< RTC_YEAR_OFFS;
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writel(rtc_reg, ioaddr + RTC_ALARM_DATE_REG_OFFS);
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writel(0, ioaddr + RTC_ALARM_INTERRUPT_CASUE_REG_OFFS);
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writel(alm->enabled ? 1 : 0,
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ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
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return 0;
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}
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static int mv_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
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{
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struct rtc_plat_data *pdata = dev_get_drvdata(dev);
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void __iomem *ioaddr = pdata->ioaddr;
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if (pdata->irq < 0)
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return -EINVAL; /* fall back into rtc-dev's emulation */
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if (enabled)
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writel(1, ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
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else
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writel(0, ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
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return 0;
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}
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static irqreturn_t mv_rtc_interrupt(int irq, void *data)
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{
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struct rtc_plat_data *pdata = data;
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void __iomem *ioaddr = pdata->ioaddr;
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/* alarm irq? */
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if (!readl(ioaddr + RTC_ALARM_INTERRUPT_CASUE_REG_OFFS))
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return IRQ_NONE;
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/* clear interrupt */
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writel(0, ioaddr + RTC_ALARM_INTERRUPT_CASUE_REG_OFFS);
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rtc_update_irq(pdata->rtc, 1, RTC_IRQF | RTC_AF);
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return IRQ_HANDLED;
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}
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static const struct rtc_class_ops mv_rtc_ops = {
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.read_time = mv_rtc_read_time,
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.set_time = mv_rtc_set_time,
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.read_alarm = mv_rtc_read_alarm,
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.set_alarm = mv_rtc_set_alarm,
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.alarm_irq_enable = mv_rtc_alarm_irq_enable,
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};
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static int __init mv_rtc_probe(struct platform_device *pdev)
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{
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struct rtc_plat_data *pdata;
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u32 rtc_time;
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int ret = 0;
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pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
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if (!pdata)
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return -ENOMEM;
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pdata->ioaddr = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(pdata->ioaddr))
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return PTR_ERR(pdata->ioaddr);
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pdata->clk = devm_clk_get(&pdev->dev, NULL);
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/* Not all SoCs require a clock.*/
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if (!IS_ERR(pdata->clk))
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clk_prepare_enable(pdata->clk);
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/* make sure the 24 hour mode is enabled */
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rtc_time = readl(pdata->ioaddr + RTC_TIME_REG_OFFS);
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if (rtc_time & RTC_HOURS_12H_MODE) {
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dev_err(&pdev->dev, "12 Hour mode is enabled but not supported.\n");
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ret = -EINVAL;
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goto out;
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}
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/* make sure it is actually functional */
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if (rtc_time == 0x01000000) {
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ssleep(1);
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rtc_time = readl(pdata->ioaddr + RTC_TIME_REG_OFFS);
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if (rtc_time == 0x01000000) {
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dev_err(&pdev->dev, "internal RTC not ticking\n");
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ret = -ENODEV;
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goto out;
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}
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}
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pdata->irq = platform_get_irq(pdev, 0);
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platform_set_drvdata(pdev, pdata);
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pdata->rtc = devm_rtc_allocate_device(&pdev->dev);
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if (IS_ERR(pdata->rtc)) {
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ret = PTR_ERR(pdata->rtc);
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goto out;
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}
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if (pdata->irq >= 0) {
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writel(0, pdata->ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);
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if (devm_request_irq(&pdev->dev, pdata->irq, mv_rtc_interrupt,
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IRQF_SHARED,
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pdev->name, pdata) < 0) {
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dev_warn(&pdev->dev, "interrupt not available.\n");
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pdata->irq = -1;
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}
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}
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if (pdata->irq >= 0)
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device_init_wakeup(&pdev->dev, 1);
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else
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clear_bit(RTC_FEATURE_ALARM, pdata->rtc->features);
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pdata->rtc->ops = &mv_rtc_ops;
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pdata->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
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pdata->rtc->range_max = RTC_TIMESTAMP_END_2099;
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ret = devm_rtc_register_device(pdata->rtc);
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if (!ret)
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return 0;
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out:
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if (!IS_ERR(pdata->clk))
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clk_disable_unprepare(pdata->clk);
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return ret;
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}
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static int __exit mv_rtc_remove(struct platform_device *pdev)
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{
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struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
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if (pdata->irq >= 0)
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device_init_wakeup(&pdev->dev, 0);
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if (!IS_ERR(pdata->clk))
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clk_disable_unprepare(pdata->clk);
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return 0;
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}
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#ifdef CONFIG_OF
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static const struct of_device_id rtc_mv_of_match_table[] = {
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{ .compatible = "marvell,orion-rtc", },
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{}
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};
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MODULE_DEVICE_TABLE(of, rtc_mv_of_match_table);
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#endif
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static struct platform_driver mv_rtc_driver = {
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.remove = __exit_p(mv_rtc_remove),
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.driver = {
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.name = "rtc-mv",
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.of_match_table = of_match_ptr(rtc_mv_of_match_table),
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},
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};
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module_platform_driver_probe(mv_rtc_driver, mv_rtc_probe);
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MODULE_AUTHOR("Saeed Bishara <saeed@marvell.com>");
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MODULE_DESCRIPTION("Marvell RTC driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:rtc-mv");
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