371 lines
9.4 KiB
C
371 lines
9.4 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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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/ds1286.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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#define DRV_VERSION "1.0"
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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 rtc_valid_tm(tm);
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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 resource *res;
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struct ds1286_priv *priv;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res)
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return -ENODEV;
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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_ioremap_resource(&pdev->dev, res);
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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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.owner = THIS_MODULE,
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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 <tsbogend@alpha.franken.de>");
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MODULE_DESCRIPTION("DS1286 RTC driver");
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MODULE_LICENSE("GPL");
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MODULE_VERSION(DRV_VERSION);
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MODULE_ALIAS("platform:rtc-ds1286");
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