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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /drivers/rtc/rtc-ds1286.c
Initial import
Diffstat (limited to 'drivers/rtc/rtc-ds1286.c')
-rw-r--r--drivers/rtc/rtc-ds1286.c369
1 files changed, 369 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-ds1286.c b/drivers/rtc/rtc-ds1286.c
new file mode 100644
index 000000000..2fe537f4e
--- /dev/null
+++ b/drivers/rtc/rtc-ds1286.c
@@ -0,0 +1,369 @@
+/*
+ * DS1286 Real Time Clock interface for Linux
+ *
+ * Copyright (C) 1998, 1999, 2000 Ralf Baechle
+ * Copyright (C) 2008 Thomas Bogendoerfer
+ *
+ * Based on code written by Paul Gortmaker.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/rtc.h>
+#include <linux/platform_device.h>
+#include <linux/bcd.h>
+#include <linux/ds1286.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+
+#define DRV_VERSION "1.0"
+
+struct ds1286_priv {
+ struct rtc_device *rtc;
+ u32 __iomem *rtcregs;
+ spinlock_t lock;
+};
+
+static inline u8 ds1286_rtc_read(struct ds1286_priv *priv, int reg)
+{
+ return __raw_readl(&priv->rtcregs[reg]) & 0xff;
+}
+
+static inline void ds1286_rtc_write(struct ds1286_priv *priv, u8 data, int reg)
+{
+ __raw_writel(data, &priv->rtcregs[reg]);
+}
+
+
+static int ds1286_alarm_irq_enable(struct device *dev, unsigned int enabled)
+{
+ struct ds1286_priv *priv = dev_get_drvdata(dev);
+ unsigned long flags;
+ unsigned char val;
+
+ /* Allow or mask alarm interrupts */
+ spin_lock_irqsave(&priv->lock, flags);
+ val = ds1286_rtc_read(priv, RTC_CMD);
+ if (enabled)
+ val &= ~RTC_TDM;
+ else
+ val |= RTC_TDM;
+ ds1286_rtc_write(priv, val, RTC_CMD);
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ return 0;
+}
+
+#ifdef CONFIG_RTC_INTF_DEV
+
+static int ds1286_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
+{
+ struct ds1286_priv *priv = dev_get_drvdata(dev);
+ unsigned long flags;
+ unsigned char val;
+
+ switch (cmd) {
+ case RTC_WIE_OFF:
+ /* Mask watchdog int. enab. bit */
+ spin_lock_irqsave(&priv->lock, flags);
+ val = ds1286_rtc_read(priv, RTC_CMD);
+ val |= RTC_WAM;
+ ds1286_rtc_write(priv, val, RTC_CMD);
+ spin_unlock_irqrestore(&priv->lock, flags);
+ break;
+ case RTC_WIE_ON:
+ /* Allow watchdog interrupts. */
+ spin_lock_irqsave(&priv->lock, flags);
+ val = ds1286_rtc_read(priv, RTC_CMD);
+ val &= ~RTC_WAM;
+ ds1286_rtc_write(priv, val, RTC_CMD);
+ spin_unlock_irqrestore(&priv->lock, flags);
+ break;
+ default:
+ return -ENOIOCTLCMD;
+ }
+ return 0;
+}
+
+#else
+#define ds1286_ioctl NULL
+#endif
+
+#ifdef CONFIG_PROC_FS
+
+static int ds1286_proc(struct device *dev, struct seq_file *seq)
+{
+ struct ds1286_priv *priv = dev_get_drvdata(dev);
+ unsigned char month, cmd, amode;
+ const char *s;
+
+ month = ds1286_rtc_read(priv, RTC_MONTH);
+ seq_printf(seq,
+ "oscillator\t: %s\n"
+ "square_wave\t: %s\n",
+ (month & RTC_EOSC) ? "disabled" : "enabled",
+ (month & RTC_ESQW) ? "disabled" : "enabled");
+
+ amode = ((ds1286_rtc_read(priv, RTC_MINUTES_ALARM) & 0x80) >> 5) |
+ ((ds1286_rtc_read(priv, RTC_HOURS_ALARM) & 0x80) >> 6) |
+ ((ds1286_rtc_read(priv, RTC_DAY_ALARM) & 0x80) >> 7);
+ switch (amode) {
+ case 7:
+ s = "each minute";
+ break;
+ case 3:
+ s = "minutes match";
+ break;
+ case 1:
+ s = "hours and minutes match";
+ break;
+ case 0:
+ s = "days, hours and minutes match";
+ break;
+ default:
+ s = "invalid";
+ break;
+ }
+ seq_printf(seq, "alarm_mode\t: %s\n", s);
+
+ cmd = ds1286_rtc_read(priv, RTC_CMD);
+ seq_printf(seq,
+ "alarm_enable\t: %s\n"
+ "wdog_alarm\t: %s\n"
+ "alarm_mask\t: %s\n"
+ "wdog_alarm_mask\t: %s\n"
+ "interrupt_mode\t: %s\n"
+ "INTB_mode\t: %s_active\n"
+ "interrupt_pins\t: %s\n",
+ (cmd & RTC_TDF) ? "yes" : "no",
+ (cmd & RTC_WAF) ? "yes" : "no",
+ (cmd & RTC_TDM) ? "disabled" : "enabled",
+ (cmd & RTC_WAM) ? "disabled" : "enabled",
+ (cmd & RTC_PU_LVL) ? "pulse" : "level",
+ (cmd & RTC_IBH_LO) ? "low" : "high",
+ (cmd & RTC_IPSW) ? "unswapped" : "swapped");
+ return 0;
+}
+
+#else
+#define ds1286_proc NULL
+#endif
+
+static int ds1286_read_time(struct device *dev, struct rtc_time *tm)
+{
+ struct ds1286_priv *priv = dev_get_drvdata(dev);
+ unsigned char save_control;
+ unsigned long flags;
+ unsigned long uip_watchdog = jiffies;
+
+ /*
+ * read RTC once any update in progress is done. The update
+ * can take just over 2ms. We wait 10 to 20ms. There is no need to
+ * to poll-wait (up to 1s - eeccch) for the falling edge of RTC_UIP.
+ * If you need to know *exactly* when a second has started, enable
+ * periodic update complete interrupts, (via ioctl) and then
+ * immediately read /dev/rtc which will block until you get the IRQ.
+ * Once the read clears, read the RTC time (again via ioctl). Easy.
+ */
+
+ if (ds1286_rtc_read(priv, RTC_CMD) & RTC_TE)
+ while (time_before(jiffies, uip_watchdog + 2*HZ/100))
+ barrier();
+
+ /*
+ * Only the values that we read from the RTC are set. We leave
+ * tm_wday, tm_yday and tm_isdst untouched. Even though the
+ * RTC has RTC_DAY_OF_WEEK, we ignore it, as it is only updated
+ * by the RTC when initially set to a non-zero value.
+ */
+ spin_lock_irqsave(&priv->lock, flags);
+ save_control = ds1286_rtc_read(priv, RTC_CMD);
+ ds1286_rtc_write(priv, (save_control|RTC_TE), RTC_CMD);
+
+ tm->tm_sec = ds1286_rtc_read(priv, RTC_SECONDS);
+ tm->tm_min = ds1286_rtc_read(priv, RTC_MINUTES);
+ tm->tm_hour = ds1286_rtc_read(priv, RTC_HOURS) & 0x3f;
+ tm->tm_mday = ds1286_rtc_read(priv, RTC_DATE);
+ tm->tm_mon = ds1286_rtc_read(priv, RTC_MONTH) & 0x1f;
+ tm->tm_year = ds1286_rtc_read(priv, RTC_YEAR);
+
+ ds1286_rtc_write(priv, save_control, RTC_CMD);
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ tm->tm_sec = bcd2bin(tm->tm_sec);
+ tm->tm_min = bcd2bin(tm->tm_min);
+ tm->tm_hour = bcd2bin(tm->tm_hour);
+ tm->tm_mday = bcd2bin(tm->tm_mday);
+ tm->tm_mon = bcd2bin(tm->tm_mon);
+ tm->tm_year = bcd2bin(tm->tm_year);
+
+ /*
+ * Account for differences between how the RTC uses the values
+ * and how they are defined in a struct rtc_time;
+ */
+ if (tm->tm_year < 45)
+ tm->tm_year += 30;
+ tm->tm_year += 40;
+ if (tm->tm_year < 70)
+ tm->tm_year += 100;
+
+ tm->tm_mon--;
+
+ return rtc_valid_tm(tm);
+}
+
+static int ds1286_set_time(struct device *dev, struct rtc_time *tm)
+{
+ struct ds1286_priv *priv = dev_get_drvdata(dev);
+ unsigned char mon, day, hrs, min, sec;
+ unsigned char save_control;
+ unsigned int yrs;
+ unsigned long flags;
+
+ yrs = tm->tm_year + 1900;
+ mon = tm->tm_mon + 1; /* tm_mon starts at zero */
+ day = tm->tm_mday;
+ hrs = tm->tm_hour;
+ min = tm->tm_min;
+ sec = tm->tm_sec;
+
+ if (yrs < 1970)
+ return -EINVAL;
+
+ yrs -= 1940;
+ if (yrs > 255) /* They are unsigned */
+ return -EINVAL;
+
+ if (yrs >= 100)
+ yrs -= 100;
+
+ sec = bin2bcd(sec);
+ min = bin2bcd(min);
+ hrs = bin2bcd(hrs);
+ day = bin2bcd(day);
+ mon = bin2bcd(mon);
+ yrs = bin2bcd(yrs);
+
+ spin_lock_irqsave(&priv->lock, flags);
+ save_control = ds1286_rtc_read(priv, RTC_CMD);
+ ds1286_rtc_write(priv, (save_control|RTC_TE), RTC_CMD);
+
+ ds1286_rtc_write(priv, yrs, RTC_YEAR);
+ ds1286_rtc_write(priv, mon, RTC_MONTH);
+ ds1286_rtc_write(priv, day, RTC_DATE);
+ ds1286_rtc_write(priv, hrs, RTC_HOURS);
+ ds1286_rtc_write(priv, min, RTC_MINUTES);
+ ds1286_rtc_write(priv, sec, RTC_SECONDS);
+ ds1286_rtc_write(priv, 0, RTC_HUNDREDTH_SECOND);
+
+ ds1286_rtc_write(priv, save_control, RTC_CMD);
+ spin_unlock_irqrestore(&priv->lock, flags);
+ return 0;
+}
+
+static int ds1286_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
+{
+ struct ds1286_priv *priv = dev_get_drvdata(dev);
+ unsigned long flags;
+
+ /*
+ * Only the values that we read from the RTC are set. That
+ * means only tm_wday, tm_hour, tm_min.
+ */
+ spin_lock_irqsave(&priv->lock, flags);
+ alm->time.tm_min = ds1286_rtc_read(priv, RTC_MINUTES_ALARM) & 0x7f;
+ alm->time.tm_hour = ds1286_rtc_read(priv, RTC_HOURS_ALARM) & 0x1f;
+ alm->time.tm_wday = ds1286_rtc_read(priv, RTC_DAY_ALARM) & 0x07;
+ ds1286_rtc_read(priv, RTC_CMD);
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ alm->time.tm_min = bcd2bin(alm->time.tm_min);
+ alm->time.tm_hour = bcd2bin(alm->time.tm_hour);
+ alm->time.tm_sec = 0;
+ return 0;
+}
+
+static int ds1286_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
+{
+ struct ds1286_priv *priv = dev_get_drvdata(dev);
+ unsigned char hrs, min, sec;
+
+ hrs = alm->time.tm_hour;
+ min = alm->time.tm_min;
+ sec = alm->time.tm_sec;
+
+ if (hrs >= 24)
+ hrs = 0xff;
+
+ if (min >= 60)
+ min = 0xff;
+
+ if (sec != 0)
+ return -EINVAL;
+
+ min = bin2bcd(min);
+ hrs = bin2bcd(hrs);
+
+ spin_lock(&priv->lock);
+ ds1286_rtc_write(priv, hrs, RTC_HOURS_ALARM);
+ ds1286_rtc_write(priv, min, RTC_MINUTES_ALARM);
+ spin_unlock(&priv->lock);
+
+ return 0;
+}
+
+static const struct rtc_class_ops ds1286_ops = {
+ .ioctl = ds1286_ioctl,
+ .proc = ds1286_proc,
+ .read_time = ds1286_read_time,
+ .set_time = ds1286_set_time,
+ .read_alarm = ds1286_read_alarm,
+ .set_alarm = ds1286_set_alarm,
+ .alarm_irq_enable = ds1286_alarm_irq_enable,
+};
+
+static int ds1286_probe(struct platform_device *pdev)
+{
+ struct rtc_device *rtc;
+ struct resource *res;
+ struct ds1286_priv *priv;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res)
+ return -ENODEV;
+ priv = devm_kzalloc(&pdev->dev, sizeof(struct ds1286_priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->rtcregs = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(priv->rtcregs))
+ return PTR_ERR(priv->rtcregs);
+
+ spin_lock_init(&priv->lock);
+ platform_set_drvdata(pdev, priv);
+ rtc = devm_rtc_device_register(&pdev->dev, "ds1286", &ds1286_ops,
+ THIS_MODULE);
+ if (IS_ERR(rtc))
+ return PTR_ERR(rtc);
+ priv->rtc = rtc;
+ return 0;
+}
+
+static struct platform_driver ds1286_platform_driver = {
+ .driver = {
+ .name = "rtc-ds1286",
+ },
+ .probe = ds1286_probe,
+};
+
+module_platform_driver(ds1286_platform_driver);
+
+MODULE_AUTHOR("Thomas Bogendoerfer <tsbogend@alpha.franken.de>");
+MODULE_DESCRIPTION("DS1286 RTC driver");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DRV_VERSION);
+MODULE_ALIAS("platform:rtc-ds1286");