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- // SPDX-License-Identifier: GPL-2.0-or-later
- /*
- * Real Time Clock interface for Linux on Atmel AT91RM9200
- *
- * Copyright (C) 2002 Rick Bronson
- *
- * Converted to RTC class model by Andrew Victor
- *
- * Ported to Linux 2.6 by Steven Scholz
- * Based on s3c2410-rtc.c Simtec Electronics
- *
- * Based on sa1100-rtc.c by Nils Faerber
- * Based on rtc.c by Paul Gortmaker
- */
- #include <linux/bcd.h>
- #include <linux/bitfield.h>
- #include <linux/clk.h>
- #include <linux/completion.h>
- #include <linux/interrupt.h>
- #include <linux/ioctl.h>
- #include <linux/io.h>
- #include <linux/kernel.h>
- #include <linux/module.h>
- #include <linux/of_device.h>
- #include <linux/of.h>
- #include <linux/platform_device.h>
- #include <linux/rtc.h>
- #include <linux/spinlock.h>
- #include <linux/suspend.h>
- #include <linux/time.h>
- #include <linux/uaccess.h>
- #define AT91_RTC_CR 0x00 /* Control Register */
- #define AT91_RTC_UPDTIM BIT(0) /* Update Request Time Register */
- #define AT91_RTC_UPDCAL BIT(1) /* Update Request Calendar Register */
- #define AT91_RTC_MR 0x04 /* Mode Register */
- #define AT91_RTC_HRMOD BIT(0) /* 12/24 hour mode */
- #define AT91_RTC_NEGPPM BIT(4) /* Negative PPM correction */
- #define AT91_RTC_CORRECTION GENMASK(14, 8) /* Slow clock correction */
- #define AT91_RTC_HIGHPPM BIT(15) /* High PPM correction */
- #define AT91_RTC_TIMR 0x08 /* Time Register */
- #define AT91_RTC_SEC GENMASK(6, 0) /* Current Second */
- #define AT91_RTC_MIN GENMASK(14, 8) /* Current Minute */
- #define AT91_RTC_HOUR GENMASK(21, 16) /* Current Hour */
- #define AT91_RTC_AMPM BIT(22) /* Ante Meridiem Post Meridiem Indicator */
- #define AT91_RTC_CALR 0x0c /* Calendar Register */
- #define AT91_RTC_CENT GENMASK(6, 0) /* Current Century */
- #define AT91_RTC_YEAR GENMASK(15, 8) /* Current Year */
- #define AT91_RTC_MONTH GENMASK(20, 16) /* Current Month */
- #define AT91_RTC_DAY GENMASK(23, 21) /* Current Day */
- #define AT91_RTC_DATE GENMASK(29, 24) /* Current Date */
- #define AT91_RTC_TIMALR 0x10 /* Time Alarm Register */
- #define AT91_RTC_SECEN BIT(7) /* Second Alarm Enable */
- #define AT91_RTC_MINEN BIT(15) /* Minute Alarm Enable */
- #define AT91_RTC_HOUREN BIT(23) /* Hour Alarm Enable */
- #define AT91_RTC_CALALR 0x14 /* Calendar Alarm Register */
- #define AT91_RTC_MTHEN BIT(23) /* Month Alarm Enable */
- #define AT91_RTC_DATEEN BIT(31) /* Date Alarm Enable */
- #define AT91_RTC_SR 0x18 /* Status Register */
- #define AT91_RTC_ACKUPD BIT(0) /* Acknowledge for Update */
- #define AT91_RTC_ALARM BIT(1) /* Alarm Flag */
- #define AT91_RTC_SECEV BIT(2) /* Second Event */
- #define AT91_RTC_TIMEV BIT(3) /* Time Event */
- #define AT91_RTC_CALEV BIT(4) /* Calendar Event */
- #define AT91_RTC_SCCR 0x1c /* Status Clear Command Register */
- #define AT91_RTC_IER 0x20 /* Interrupt Enable Register */
- #define AT91_RTC_IDR 0x24 /* Interrupt Disable Register */
- #define AT91_RTC_IMR 0x28 /* Interrupt Mask Register */
- #define AT91_RTC_VER 0x2c /* Valid Entry Register */
- #define AT91_RTC_NVTIM BIT(0) /* Non valid Time */
- #define AT91_RTC_NVCAL BIT(1) /* Non valid Calendar */
- #define AT91_RTC_NVTIMALR BIT(2) /* Non valid Time Alarm */
- #define AT91_RTC_NVCALALR BIT(3) /* Non valid Calendar Alarm */
- #define AT91_RTC_CORR_DIVIDEND 3906000
- #define AT91_RTC_CORR_LOW_RATIO 20
- #define at91_rtc_read(field) \
- readl_relaxed(at91_rtc_regs + field)
- #define at91_rtc_write(field, val) \
- writel_relaxed((val), at91_rtc_regs + field)
- struct at91_rtc_config {
- bool use_shadow_imr;
- bool has_correction;
- };
- static const struct at91_rtc_config *at91_rtc_config;
- static DECLARE_COMPLETION(at91_rtc_updated);
- static DECLARE_COMPLETION(at91_rtc_upd_rdy);
- static void __iomem *at91_rtc_regs;
- static int irq;
- static DEFINE_SPINLOCK(at91_rtc_lock);
- static u32 at91_rtc_shadow_imr;
- static bool suspended;
- static DEFINE_SPINLOCK(suspended_lock);
- static unsigned long cached_events;
- static u32 at91_rtc_imr;
- static struct clk *sclk;
- static void at91_rtc_write_ier(u32 mask)
- {
- unsigned long flags;
- spin_lock_irqsave(&at91_rtc_lock, flags);
- at91_rtc_shadow_imr |= mask;
- at91_rtc_write(AT91_RTC_IER, mask);
- spin_unlock_irqrestore(&at91_rtc_lock, flags);
- }
- static void at91_rtc_write_idr(u32 mask)
- {
- unsigned long flags;
- spin_lock_irqsave(&at91_rtc_lock, flags);
- at91_rtc_write(AT91_RTC_IDR, mask);
- /*
- * Register read back (of any RTC-register) needed to make sure
- * IDR-register write has reached the peripheral before updating
- * shadow mask.
- *
- * Note that there is still a possibility that the mask is updated
- * before interrupts have actually been disabled in hardware. The only
- * way to be certain would be to poll the IMR-register, which is is
- * the very register we are trying to emulate. The register read back
- * is a reasonable heuristic.
- */
- at91_rtc_read(AT91_RTC_SR);
- at91_rtc_shadow_imr &= ~mask;
- spin_unlock_irqrestore(&at91_rtc_lock, flags);
- }
- static u32 at91_rtc_read_imr(void)
- {
- unsigned long flags;
- u32 mask;
- if (at91_rtc_config->use_shadow_imr) {
- spin_lock_irqsave(&at91_rtc_lock, flags);
- mask = at91_rtc_shadow_imr;
- spin_unlock_irqrestore(&at91_rtc_lock, flags);
- } else {
- mask = at91_rtc_read(AT91_RTC_IMR);
- }
- return mask;
- }
- /*
- * Decode time/date into rtc_time structure
- */
- static void at91_rtc_decodetime(unsigned int timereg, unsigned int calreg,
- struct rtc_time *tm)
- {
- unsigned int time, date;
- /* must read twice in case it changes */
- do {
- time = at91_rtc_read(timereg);
- date = at91_rtc_read(calreg);
- } while ((time != at91_rtc_read(timereg)) ||
- (date != at91_rtc_read(calreg)));
- tm->tm_sec = bcd2bin(FIELD_GET(AT91_RTC_SEC, time));
- tm->tm_min = bcd2bin(FIELD_GET(AT91_RTC_MIN, time));
- tm->tm_hour = bcd2bin(FIELD_GET(AT91_RTC_HOUR, time));
- /*
- * The Calendar Alarm register does not have a field for
- * the year - so these will return an invalid value.
- */
- tm->tm_year = bcd2bin(date & AT91_RTC_CENT) * 100; /* century */
- tm->tm_year += bcd2bin(FIELD_GET(AT91_RTC_YEAR, date)); /* year */
- tm->tm_wday = bcd2bin(FIELD_GET(AT91_RTC_DAY, date)) - 1; /* day of the week [0-6], Sunday=0 */
- tm->tm_mon = bcd2bin(FIELD_GET(AT91_RTC_MONTH, date)) - 1;
- tm->tm_mday = bcd2bin(FIELD_GET(AT91_RTC_DATE, date));
- }
- /*
- * Read current time and date in RTC
- */
- static int at91_rtc_readtime(struct device *dev, struct rtc_time *tm)
- {
- at91_rtc_decodetime(AT91_RTC_TIMR, AT91_RTC_CALR, tm);
- tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon, tm->tm_year);
- tm->tm_year = tm->tm_year - 1900;
- dev_dbg(dev, "%s(): %ptR\n", __func__, tm);
- return 0;
- }
- /*
- * Set current time and date in RTC
- */
- static int at91_rtc_settime(struct device *dev, struct rtc_time *tm)
- {
- unsigned long cr;
- dev_dbg(dev, "%s(): %ptR\n", __func__, tm);
- wait_for_completion(&at91_rtc_upd_rdy);
- /* Stop Time/Calendar from counting */
- cr = at91_rtc_read(AT91_RTC_CR);
- at91_rtc_write(AT91_RTC_CR, cr | AT91_RTC_UPDCAL | AT91_RTC_UPDTIM);
- at91_rtc_write_ier(AT91_RTC_ACKUPD);
- wait_for_completion(&at91_rtc_updated); /* wait for ACKUPD interrupt */
- at91_rtc_write_idr(AT91_RTC_ACKUPD);
- at91_rtc_write(AT91_RTC_TIMR,
- FIELD_PREP(AT91_RTC_SEC, bin2bcd(tm->tm_sec))
- | FIELD_PREP(AT91_RTC_MIN, bin2bcd(tm->tm_min))
- | FIELD_PREP(AT91_RTC_HOUR, bin2bcd(tm->tm_hour)));
- at91_rtc_write(AT91_RTC_CALR,
- FIELD_PREP(AT91_RTC_CENT,
- bin2bcd((tm->tm_year + 1900) / 100))
- | FIELD_PREP(AT91_RTC_YEAR, bin2bcd(tm->tm_year % 100))
- | FIELD_PREP(AT91_RTC_MONTH, bin2bcd(tm->tm_mon + 1))
- | FIELD_PREP(AT91_RTC_DAY, bin2bcd(tm->tm_wday + 1))
- | FIELD_PREP(AT91_RTC_DATE, bin2bcd(tm->tm_mday)));
- /* Restart Time/Calendar */
- cr = at91_rtc_read(AT91_RTC_CR);
- at91_rtc_write(AT91_RTC_SCCR, AT91_RTC_SECEV);
- at91_rtc_write(AT91_RTC_CR, cr & ~(AT91_RTC_UPDCAL | AT91_RTC_UPDTIM));
- at91_rtc_write_ier(AT91_RTC_SECEV);
- return 0;
- }
- /*
- * Read alarm time and date in RTC
- */
- static int at91_rtc_readalarm(struct device *dev, struct rtc_wkalrm *alrm)
- {
- struct rtc_time *tm = &alrm->time;
- at91_rtc_decodetime(AT91_RTC_TIMALR, AT91_RTC_CALALR, tm);
- tm->tm_year = -1;
- alrm->enabled = (at91_rtc_read_imr() & AT91_RTC_ALARM)
- ? 1 : 0;
- dev_dbg(dev, "%s(): %ptR %sabled\n", __func__, tm,
- alrm->enabled ? "en" : "dis");
- return 0;
- }
- /*
- * Set alarm time and date in RTC
- */
- static int at91_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
- {
- struct rtc_time tm = alrm->time;
- at91_rtc_write_idr(AT91_RTC_ALARM);
- at91_rtc_write(AT91_RTC_TIMALR,
- FIELD_PREP(AT91_RTC_SEC, bin2bcd(alrm->time.tm_sec))
- | FIELD_PREP(AT91_RTC_MIN, bin2bcd(alrm->time.tm_min))
- | FIELD_PREP(AT91_RTC_HOUR, bin2bcd(alrm->time.tm_hour))
- | AT91_RTC_HOUREN | AT91_RTC_MINEN | AT91_RTC_SECEN);
- at91_rtc_write(AT91_RTC_CALALR,
- FIELD_PREP(AT91_RTC_MONTH, bin2bcd(alrm->time.tm_mon + 1))
- | FIELD_PREP(AT91_RTC_DATE, bin2bcd(alrm->time.tm_mday))
- | AT91_RTC_DATEEN | AT91_RTC_MTHEN);
- if (alrm->enabled) {
- at91_rtc_write(AT91_RTC_SCCR, AT91_RTC_ALARM);
- at91_rtc_write_ier(AT91_RTC_ALARM);
- }
- dev_dbg(dev, "%s(): %ptR\n", __func__, &tm);
- return 0;
- }
- static int at91_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
- {
- dev_dbg(dev, "%s(): cmd=%08x\n", __func__, enabled);
- if (enabled) {
- at91_rtc_write(AT91_RTC_SCCR, AT91_RTC_ALARM);
- at91_rtc_write_ier(AT91_RTC_ALARM);
- } else
- at91_rtc_write_idr(AT91_RTC_ALARM);
- return 0;
- }
- static int at91_rtc_readoffset(struct device *dev, long *offset)
- {
- u32 mr = at91_rtc_read(AT91_RTC_MR);
- long val = FIELD_GET(AT91_RTC_CORRECTION, mr);
- if (!val) {
- *offset = 0;
- return 0;
- }
- val++;
- if (!(mr & AT91_RTC_NEGPPM))
- val = -val;
- if (!(mr & AT91_RTC_HIGHPPM))
- val *= AT91_RTC_CORR_LOW_RATIO;
- *offset = DIV_ROUND_CLOSEST(AT91_RTC_CORR_DIVIDEND, val);
- return 0;
- }
- static int at91_rtc_setoffset(struct device *dev, long offset)
- {
- long corr;
- u32 mr;
- if (offset > AT91_RTC_CORR_DIVIDEND / 2)
- return -ERANGE;
- if (offset < -AT91_RTC_CORR_DIVIDEND / 2)
- return -ERANGE;
- mr = at91_rtc_read(AT91_RTC_MR);
- mr &= ~(AT91_RTC_NEGPPM | AT91_RTC_CORRECTION | AT91_RTC_HIGHPPM);
- if (offset > 0)
- mr |= AT91_RTC_NEGPPM;
- else
- offset = -offset;
- /* offset less than 764 ppb, disable correction*/
- if (offset < 764) {
- at91_rtc_write(AT91_RTC_MR, mr & ~AT91_RTC_NEGPPM);
- return 0;
- }
- /*
- * 29208 ppb is the perfect cutoff between low range and high range
- * low range values are never better than high range value after that.
- */
- if (offset < 29208) {
- corr = DIV_ROUND_CLOSEST(AT91_RTC_CORR_DIVIDEND, offset * AT91_RTC_CORR_LOW_RATIO);
- } else {
- corr = DIV_ROUND_CLOSEST(AT91_RTC_CORR_DIVIDEND, offset);
- mr |= AT91_RTC_HIGHPPM;
- }
- if (corr > 128)
- corr = 128;
- mr |= FIELD_PREP(AT91_RTC_CORRECTION, corr - 1);
- at91_rtc_write(AT91_RTC_MR, mr);
- return 0;
- }
- /*
- * IRQ handler for the RTC
- */
- static irqreturn_t at91_rtc_interrupt(int irq, void *dev_id)
- {
- struct platform_device *pdev = dev_id;
- struct rtc_device *rtc = platform_get_drvdata(pdev);
- unsigned int rtsr;
- unsigned long events = 0;
- int ret = IRQ_NONE;
- spin_lock(&suspended_lock);
- rtsr = at91_rtc_read(AT91_RTC_SR) & at91_rtc_read_imr();
- if (rtsr) { /* this interrupt is shared! Is it ours? */
- if (rtsr & AT91_RTC_ALARM)
- events |= (RTC_AF | RTC_IRQF);
- if (rtsr & AT91_RTC_SECEV) {
- complete(&at91_rtc_upd_rdy);
- at91_rtc_write_idr(AT91_RTC_SECEV);
- }
- if (rtsr & AT91_RTC_ACKUPD)
- complete(&at91_rtc_updated);
- at91_rtc_write(AT91_RTC_SCCR, rtsr); /* clear status reg */
- if (!suspended) {
- rtc_update_irq(rtc, 1, events);
- dev_dbg(&pdev->dev, "%s(): num=%ld, events=0x%02lx\n",
- __func__, events >> 8, events & 0x000000FF);
- } else {
- cached_events |= events;
- at91_rtc_write_idr(at91_rtc_imr);
- pm_system_wakeup();
- }
- ret = IRQ_HANDLED;
- }
- spin_unlock(&suspended_lock);
- return ret;
- }
- static const struct at91_rtc_config at91rm9200_config = {
- };
- static const struct at91_rtc_config at91sam9x5_config = {
- .use_shadow_imr = true,
- };
- static const struct at91_rtc_config sama5d4_config = {
- .has_correction = true,
- };
- static const struct of_device_id at91_rtc_dt_ids[] = {
- {
- .compatible = "atmel,at91rm9200-rtc",
- .data = &at91rm9200_config,
- }, {
- .compatible = "atmel,at91sam9x5-rtc",
- .data = &at91sam9x5_config,
- }, {
- .compatible = "atmel,sama5d4-rtc",
- .data = &sama5d4_config,
- }, {
- .compatible = "atmel,sama5d2-rtc",
- .data = &sama5d4_config,
- }, {
- .compatible = "microchip,sam9x60-rtc",
- .data = &sama5d4_config,
- }, {
- /* sentinel */
- }
- };
- MODULE_DEVICE_TABLE(of, at91_rtc_dt_ids);
- static const struct rtc_class_ops at91_rtc_ops = {
- .read_time = at91_rtc_readtime,
- .set_time = at91_rtc_settime,
- .read_alarm = at91_rtc_readalarm,
- .set_alarm = at91_rtc_setalarm,
- .alarm_irq_enable = at91_rtc_alarm_irq_enable,
- };
- static const struct rtc_class_ops sama5d4_rtc_ops = {
- .read_time = at91_rtc_readtime,
- .set_time = at91_rtc_settime,
- .read_alarm = at91_rtc_readalarm,
- .set_alarm = at91_rtc_setalarm,
- .alarm_irq_enable = at91_rtc_alarm_irq_enable,
- .set_offset = at91_rtc_setoffset,
- .read_offset = at91_rtc_readoffset,
- };
- /*
- * Initialize and install RTC driver
- */
- static int __init at91_rtc_probe(struct platform_device *pdev)
- {
- struct rtc_device *rtc;
- struct resource *regs;
- int ret = 0;
- at91_rtc_config = of_device_get_match_data(&pdev->dev);
- if (!at91_rtc_config)
- return -ENODEV;
- regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!regs) {
- dev_err(&pdev->dev, "no mmio resource defined\n");
- return -ENXIO;
- }
- irq = platform_get_irq(pdev, 0);
- if (irq < 0)
- return -ENXIO;
- at91_rtc_regs = devm_ioremap(&pdev->dev, regs->start,
- resource_size(regs));
- if (!at91_rtc_regs) {
- dev_err(&pdev->dev, "failed to map registers, aborting.\n");
- return -ENOMEM;
- }
- rtc = devm_rtc_allocate_device(&pdev->dev);
- if (IS_ERR(rtc))
- return PTR_ERR(rtc);
- platform_set_drvdata(pdev, rtc);
- sclk = devm_clk_get(&pdev->dev, NULL);
- if (IS_ERR(sclk))
- return PTR_ERR(sclk);
- ret = clk_prepare_enable(sclk);
- if (ret) {
- dev_err(&pdev->dev, "Could not enable slow clock\n");
- return ret;
- }
- at91_rtc_write(AT91_RTC_CR, 0);
- at91_rtc_write(AT91_RTC_MR, at91_rtc_read(AT91_RTC_MR) & ~AT91_RTC_HRMOD);
- /* Disable all interrupts */
- at91_rtc_write_idr(AT91_RTC_ACKUPD | AT91_RTC_ALARM |
- AT91_RTC_SECEV | AT91_RTC_TIMEV |
- AT91_RTC_CALEV);
- ret = devm_request_irq(&pdev->dev, irq, at91_rtc_interrupt,
- IRQF_SHARED | IRQF_COND_SUSPEND,
- "at91_rtc", pdev);
- if (ret) {
- dev_err(&pdev->dev, "IRQ %d already in use.\n", irq);
- goto err_clk;
- }
- /* cpu init code should really have flagged this device as
- * being wake-capable; if it didn't, do that here.
- */
- if (!device_can_wakeup(&pdev->dev))
- device_init_wakeup(&pdev->dev, 1);
- if (at91_rtc_config->has_correction)
- rtc->ops = &sama5d4_rtc_ops;
- else
- rtc->ops = &at91_rtc_ops;
- rtc->range_min = RTC_TIMESTAMP_BEGIN_1900;
- rtc->range_max = RTC_TIMESTAMP_END_2099;
- ret = devm_rtc_register_device(rtc);
- if (ret)
- goto err_clk;
- /* enable SECEV interrupt in order to initialize at91_rtc_upd_rdy
- * completion.
- */
- at91_rtc_write_ier(AT91_RTC_SECEV);
- dev_info(&pdev->dev, "AT91 Real Time Clock driver.\n");
- return 0;
- err_clk:
- clk_disable_unprepare(sclk);
- return ret;
- }
- /*
- * Disable and remove the RTC driver
- */
- static int __exit at91_rtc_remove(struct platform_device *pdev)
- {
- /* Disable all interrupts */
- at91_rtc_write_idr(AT91_RTC_ACKUPD | AT91_RTC_ALARM |
- AT91_RTC_SECEV | AT91_RTC_TIMEV |
- AT91_RTC_CALEV);
- clk_disable_unprepare(sclk);
- return 0;
- }
- static void at91_rtc_shutdown(struct platform_device *pdev)
- {
- /* Disable all interrupts */
- at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ACKUPD | AT91_RTC_ALARM |
- AT91_RTC_SECEV | AT91_RTC_TIMEV |
- AT91_RTC_CALEV);
- }
- #ifdef CONFIG_PM_SLEEP
- /* AT91RM9200 RTC Power management control */
- static int at91_rtc_suspend(struct device *dev)
- {
- /* this IRQ is shared with DBGU and other hardware which isn't
- * necessarily doing PM like we are...
- */
- at91_rtc_write(AT91_RTC_SCCR, AT91_RTC_ALARM);
- at91_rtc_imr = at91_rtc_read_imr()
- & (AT91_RTC_ALARM|AT91_RTC_SECEV);
- if (at91_rtc_imr) {
- if (device_may_wakeup(dev)) {
- unsigned long flags;
- enable_irq_wake(irq);
- spin_lock_irqsave(&suspended_lock, flags);
- suspended = true;
- spin_unlock_irqrestore(&suspended_lock, flags);
- } else {
- at91_rtc_write_idr(at91_rtc_imr);
- }
- }
- return 0;
- }
- static int at91_rtc_resume(struct device *dev)
- {
- struct rtc_device *rtc = dev_get_drvdata(dev);
- if (at91_rtc_imr) {
- if (device_may_wakeup(dev)) {
- unsigned long flags;
- spin_lock_irqsave(&suspended_lock, flags);
- if (cached_events) {
- rtc_update_irq(rtc, 1, cached_events);
- cached_events = 0;
- }
- suspended = false;
- spin_unlock_irqrestore(&suspended_lock, flags);
- disable_irq_wake(irq);
- }
- at91_rtc_write_ier(at91_rtc_imr);
- }
- return 0;
- }
- #endif
- static SIMPLE_DEV_PM_OPS(at91_rtc_pm_ops, at91_rtc_suspend, at91_rtc_resume);
- static struct platform_driver at91_rtc_driver = {
- .remove = __exit_p(at91_rtc_remove),
- .shutdown = at91_rtc_shutdown,
- .driver = {
- .name = "at91_rtc",
- .pm = &at91_rtc_pm_ops,
- .of_match_table = of_match_ptr(at91_rtc_dt_ids),
- },
- };
- module_platform_driver_probe(at91_rtc_driver, at91_rtc_probe);
- MODULE_AUTHOR("Rick Bronson");
- MODULE_DESCRIPTION("RTC driver for Atmel AT91RM9200");
- MODULE_LICENSE("GPL");
- MODULE_ALIAS("platform:at91_rtc");
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