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358 lines
9.0 KiB
358 lines
9.0 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* DS1286 Real Time Clock interface for Linux |
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* |
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* Copyright (C) 1998, 1999, 2000 Ralf Baechle |
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* Copyright (C) 2008 Thomas Bogendoerfer |
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* |
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* Based on code written by Paul Gortmaker. |
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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/bcd.h> |
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#include <linux/rtc/ds1286.h> |
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#include <linux/io.h> |
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#include <linux/slab.h> |
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struct ds1286_priv { |
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struct rtc_device *rtc; |
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u32 __iomem *rtcregs; |
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spinlock_t lock; |
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}; |
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static inline u8 ds1286_rtc_read(struct ds1286_priv *priv, int reg) |
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{ |
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return __raw_readl(&priv->rtcregs[reg]) & 0xff; |
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} |
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static inline void ds1286_rtc_write(struct ds1286_priv *priv, u8 data, int reg) |
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{ |
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__raw_writel(data, &priv->rtcregs[reg]); |
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} |
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static int ds1286_alarm_irq_enable(struct device *dev, unsigned int enabled) |
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{ |
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struct ds1286_priv *priv = dev_get_drvdata(dev); |
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unsigned long flags; |
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unsigned char val; |
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/* Allow or mask alarm interrupts */ |
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spin_lock_irqsave(&priv->lock, flags); |
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val = ds1286_rtc_read(priv, RTC_CMD); |
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if (enabled) |
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val &= ~RTC_TDM; |
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else |
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val |= RTC_TDM; |
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ds1286_rtc_write(priv, val, RTC_CMD); |
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spin_unlock_irqrestore(&priv->lock, flags); |
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return 0; |
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} |
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#ifdef CONFIG_RTC_INTF_DEV |
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static int ds1286_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) |
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{ |
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struct ds1286_priv *priv = dev_get_drvdata(dev); |
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unsigned long flags; |
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unsigned char val; |
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switch (cmd) { |
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case RTC_WIE_OFF: |
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/* Mask watchdog int. enab. bit */ |
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spin_lock_irqsave(&priv->lock, flags); |
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val = ds1286_rtc_read(priv, RTC_CMD); |
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val |= RTC_WAM; |
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ds1286_rtc_write(priv, val, RTC_CMD); |
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spin_unlock_irqrestore(&priv->lock, flags); |
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break; |
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case RTC_WIE_ON: |
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/* Allow watchdog interrupts. */ |
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spin_lock_irqsave(&priv->lock, flags); |
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val = ds1286_rtc_read(priv, RTC_CMD); |
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val &= ~RTC_WAM; |
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ds1286_rtc_write(priv, val, RTC_CMD); |
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spin_unlock_irqrestore(&priv->lock, flags); |
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break; |
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default: |
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return -ENOIOCTLCMD; |
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} |
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return 0; |
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} |
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#else |
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#define ds1286_ioctl NULL |
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#endif |
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#ifdef CONFIG_PROC_FS |
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static int ds1286_proc(struct device *dev, struct seq_file *seq) |
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{ |
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struct ds1286_priv *priv = dev_get_drvdata(dev); |
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unsigned char month, cmd, amode; |
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const char *s; |
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month = ds1286_rtc_read(priv, RTC_MONTH); |
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seq_printf(seq, |
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"oscillator\t: %s\n" |
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"square_wave\t: %s\n", |
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(month & RTC_EOSC) ? "disabled" : "enabled", |
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(month & RTC_ESQW) ? "disabled" : "enabled"); |
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amode = ((ds1286_rtc_read(priv, RTC_MINUTES_ALARM) & 0x80) >> 5) | |
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((ds1286_rtc_read(priv, RTC_HOURS_ALARM) & 0x80) >> 6) | |
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((ds1286_rtc_read(priv, RTC_DAY_ALARM) & 0x80) >> 7); |
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switch (amode) { |
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case 7: |
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s = "each minute"; |
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break; |
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case 3: |
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s = "minutes match"; |
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break; |
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case 1: |
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s = "hours and minutes match"; |
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break; |
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case 0: |
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s = "days, hours and minutes match"; |
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break; |
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default: |
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s = "invalid"; |
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break; |
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} |
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seq_printf(seq, "alarm_mode\t: %s\n", s); |
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cmd = ds1286_rtc_read(priv, RTC_CMD); |
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seq_printf(seq, |
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"alarm_enable\t: %s\n" |
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"wdog_alarm\t: %s\n" |
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"alarm_mask\t: %s\n" |
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"wdog_alarm_mask\t: %s\n" |
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"interrupt_mode\t: %s\n" |
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"INTB_mode\t: %s_active\n" |
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"interrupt_pins\t: %s\n", |
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(cmd & RTC_TDF) ? "yes" : "no", |
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(cmd & RTC_WAF) ? "yes" : "no", |
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(cmd & RTC_TDM) ? "disabled" : "enabled", |
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(cmd & RTC_WAM) ? "disabled" : "enabled", |
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(cmd & RTC_PU_LVL) ? "pulse" : "level", |
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(cmd & RTC_IBH_LO) ? "low" : "high", |
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(cmd & RTC_IPSW) ? "unswapped" : "swapped"); |
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return 0; |
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} |
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#else |
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#define ds1286_proc NULL |
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#endif |
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static int ds1286_read_time(struct device *dev, struct rtc_time *tm) |
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{ |
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struct ds1286_priv *priv = dev_get_drvdata(dev); |
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unsigned char save_control; |
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unsigned long flags; |
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unsigned long uip_watchdog = jiffies; |
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/* |
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* read RTC once any update in progress is done. The update |
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* can take just over 2ms. We wait 10 to 20ms. There is no need to |
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* to poll-wait (up to 1s - eeccch) for the falling edge of RTC_UIP. |
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* If you need to know *exactly* when a second has started, enable |
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* periodic update complete interrupts, (via ioctl) and then |
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* immediately read /dev/rtc which will block until you get the IRQ. |
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* Once the read clears, read the RTC time (again via ioctl). Easy. |
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*/ |
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if (ds1286_rtc_read(priv, RTC_CMD) & RTC_TE) |
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while (time_before(jiffies, uip_watchdog + 2*HZ/100)) |
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barrier(); |
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/* |
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* Only the values that we read from the RTC are set. We leave |
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* tm_wday, tm_yday and tm_isdst untouched. Even though the |
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* RTC has RTC_DAY_OF_WEEK, we ignore it, as it is only updated |
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* by the RTC when initially set to a non-zero value. |
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*/ |
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spin_lock_irqsave(&priv->lock, flags); |
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save_control = ds1286_rtc_read(priv, RTC_CMD); |
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ds1286_rtc_write(priv, (save_control|RTC_TE), RTC_CMD); |
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tm->tm_sec = ds1286_rtc_read(priv, RTC_SECONDS); |
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tm->tm_min = ds1286_rtc_read(priv, RTC_MINUTES); |
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tm->tm_hour = ds1286_rtc_read(priv, RTC_HOURS) & 0x3f; |
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tm->tm_mday = ds1286_rtc_read(priv, RTC_DATE); |
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tm->tm_mon = ds1286_rtc_read(priv, RTC_MONTH) & 0x1f; |
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tm->tm_year = ds1286_rtc_read(priv, RTC_YEAR); |
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ds1286_rtc_write(priv, save_control, RTC_CMD); |
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spin_unlock_irqrestore(&priv->lock, flags); |
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tm->tm_sec = bcd2bin(tm->tm_sec); |
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tm->tm_min = bcd2bin(tm->tm_min); |
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tm->tm_hour = bcd2bin(tm->tm_hour); |
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tm->tm_mday = bcd2bin(tm->tm_mday); |
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tm->tm_mon = bcd2bin(tm->tm_mon); |
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tm->tm_year = bcd2bin(tm->tm_year); |
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/* |
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* Account for differences between how the RTC uses the values |
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* and how they are defined in a struct rtc_time; |
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*/ |
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if (tm->tm_year < 45) |
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tm->tm_year += 30; |
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tm->tm_year += 40; |
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if (tm->tm_year < 70) |
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tm->tm_year += 100; |
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tm->tm_mon--; |
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return 0; |
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} |
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static int ds1286_set_time(struct device *dev, struct rtc_time *tm) |
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{ |
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struct ds1286_priv *priv = dev_get_drvdata(dev); |
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unsigned char mon, day, hrs, min, sec; |
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unsigned char save_control; |
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unsigned int yrs; |
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unsigned long flags; |
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yrs = tm->tm_year + 1900; |
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mon = tm->tm_mon + 1; /* tm_mon starts at zero */ |
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day = tm->tm_mday; |
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hrs = tm->tm_hour; |
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min = tm->tm_min; |
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sec = tm->tm_sec; |
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if (yrs < 1970) |
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return -EINVAL; |
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yrs -= 1940; |
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if (yrs > 255) /* They are unsigned */ |
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return -EINVAL; |
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if (yrs >= 100) |
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yrs -= 100; |
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sec = bin2bcd(sec); |
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min = bin2bcd(min); |
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hrs = bin2bcd(hrs); |
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day = bin2bcd(day); |
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mon = bin2bcd(mon); |
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yrs = bin2bcd(yrs); |
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spin_lock_irqsave(&priv->lock, flags); |
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save_control = ds1286_rtc_read(priv, RTC_CMD); |
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ds1286_rtc_write(priv, (save_control|RTC_TE), RTC_CMD); |
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ds1286_rtc_write(priv, yrs, RTC_YEAR); |
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ds1286_rtc_write(priv, mon, RTC_MONTH); |
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ds1286_rtc_write(priv, day, RTC_DATE); |
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ds1286_rtc_write(priv, hrs, RTC_HOURS); |
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ds1286_rtc_write(priv, min, RTC_MINUTES); |
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ds1286_rtc_write(priv, sec, RTC_SECONDS); |
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ds1286_rtc_write(priv, 0, RTC_HUNDREDTH_SECOND); |
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ds1286_rtc_write(priv, save_control, RTC_CMD); |
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spin_unlock_irqrestore(&priv->lock, flags); |
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return 0; |
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} |
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static int ds1286_read_alarm(struct device *dev, struct rtc_wkalrm *alm) |
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{ |
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struct ds1286_priv *priv = dev_get_drvdata(dev); |
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unsigned long flags; |
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/* |
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* Only the values that we read from the RTC are set. That |
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* means only tm_wday, tm_hour, tm_min. |
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*/ |
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spin_lock_irqsave(&priv->lock, flags); |
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alm->time.tm_min = ds1286_rtc_read(priv, RTC_MINUTES_ALARM) & 0x7f; |
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alm->time.tm_hour = ds1286_rtc_read(priv, RTC_HOURS_ALARM) & 0x1f; |
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alm->time.tm_wday = ds1286_rtc_read(priv, RTC_DAY_ALARM) & 0x07; |
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ds1286_rtc_read(priv, RTC_CMD); |
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spin_unlock_irqrestore(&priv->lock, flags); |
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alm->time.tm_min = bcd2bin(alm->time.tm_min); |
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alm->time.tm_hour = bcd2bin(alm->time.tm_hour); |
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alm->time.tm_sec = 0; |
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return 0; |
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} |
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static int ds1286_set_alarm(struct device *dev, struct rtc_wkalrm *alm) |
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{ |
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struct ds1286_priv *priv = dev_get_drvdata(dev); |
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unsigned char hrs, min, sec; |
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hrs = alm->time.tm_hour; |
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min = alm->time.tm_min; |
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sec = alm->time.tm_sec; |
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if (hrs >= 24) |
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hrs = 0xff; |
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if (min >= 60) |
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min = 0xff; |
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if (sec != 0) |
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return -EINVAL; |
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min = bin2bcd(min); |
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hrs = bin2bcd(hrs); |
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spin_lock(&priv->lock); |
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ds1286_rtc_write(priv, hrs, RTC_HOURS_ALARM); |
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ds1286_rtc_write(priv, min, RTC_MINUTES_ALARM); |
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spin_unlock(&priv->lock); |
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return 0; |
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} |
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static const struct rtc_class_ops ds1286_ops = { |
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.ioctl = ds1286_ioctl, |
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.proc = ds1286_proc, |
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.read_time = ds1286_read_time, |
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.set_time = ds1286_set_time, |
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.read_alarm = ds1286_read_alarm, |
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.set_alarm = ds1286_set_alarm, |
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.alarm_irq_enable = ds1286_alarm_irq_enable, |
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}; |
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static int ds1286_probe(struct platform_device *pdev) |
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{ |
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struct rtc_device *rtc; |
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struct ds1286_priv *priv; |
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priv = devm_kzalloc(&pdev->dev, sizeof(struct ds1286_priv), GFP_KERNEL); |
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if (!priv) |
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return -ENOMEM; |
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priv->rtcregs = devm_platform_ioremap_resource(pdev, 0); |
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if (IS_ERR(priv->rtcregs)) |
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return PTR_ERR(priv->rtcregs); |
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spin_lock_init(&priv->lock); |
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platform_set_drvdata(pdev, priv); |
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rtc = devm_rtc_device_register(&pdev->dev, "ds1286", &ds1286_ops, |
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THIS_MODULE); |
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if (IS_ERR(rtc)) |
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return PTR_ERR(rtc); |
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priv->rtc = rtc; |
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return 0; |
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} |
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static struct platform_driver ds1286_platform_driver = { |
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.driver = { |
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.name = "rtc-ds1286", |
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}, |
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.probe = ds1286_probe, |
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}; |
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module_platform_driver(ds1286_platform_driver); |
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MODULE_AUTHOR("Thomas Bogendoerfer <[email protected]>"); |
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MODULE_DESCRIPTION("DS1286 RTC driver"); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS("platform:rtc-ds1286");
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