@@ -165,6 +165,18 @@ config RTC_DRV_DS1672
This driver can also be built as a module. If so, the module
will be called rtc-ds1672.
+config RTC_DRV_DS1685
+ tristate "Dallas/Maxim DS1685/DS1687"
+ help
+ If you say yes here you get support for the
+ Dallas/Maxim DS1685/DS1687 timekeeping chip.
+
+ This RTC chip is used on EPPC-405-UC modules
+ by electronic system design gmbh.
+
+ This driver can also be built as a module. If so, the module
+ will be called rtc-ds1685.
+
config RTC_DRV_MAX6900
tristate "Maxim MAX6900"
help
@@ -33,6 +33,7 @@ obj-$(CONFIG_RTC_DRV_DS1390) += rtc-ds1390.o
obj-$(CONFIG_RTC_DRV_DS1511) += rtc-ds1511.o
obj-$(CONFIG_RTC_DRV_DS1553) += rtc-ds1553.o
obj-$(CONFIG_RTC_DRV_DS1672) += rtc-ds1672.o
+obj-$(CONFIG_RTC_DRV_DS1685) += rtc-ds1685.o
obj-$(CONFIG_RTC_DRV_DS1742) += rtc-ds1742.o
obj-$(CONFIG_RTC_DRV_DS3234) += rtc-ds3234.o
obj-$(CONFIG_RTC_DRV_EP93XX) += rtc-ep93xx.o
new file mode 100644
@@ -0,0 +1,470 @@
+/*
+ * An rtc driver for the Dallas DS1685/DS1687
+ *
+ * Copyright (C) 2009 Matthias Fuchs <matthias.fuchs@esd-electronics.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/bcd.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/jiffies.h>
+#include <linux/rtc.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+
+#define DRV_VERSION "0.1"
+
+#define NVRAM_SIZE_B0 114
+#define NVRAM_SIZE_B1 128
+#define NVRAM_SIZE (NVRAM_SIZE_B0 + NVRAM_SIZE_B1)
+
+#define RTC_SECONDS 0
+#define RTC_MINUTES 2
+#define RTC_HOURS 4
+#define RTC_DAY 6
+#define RTC_DATE 7
+#define RTC_MONTH 8
+#define RTC_YEAR 9
+
+#define RTC_CONTROLA 0x0a
+#define RTC_CONTROLB 0x0b
+#define RTC_CONTROLC 0x0c
+#define RTC_CONTROLD 0x0d
+#define RTC_NVRAM_START_B0 0x0e
+
+/* bits in control A register */
+#define RTC_DV2 0x40
+#define RTC_DV1 0x20
+#define RTC_DV0 0x10
+
+/* bits in control B register */
+#define RTC_SET 0x80
+#define RTC_DM 0x04
+#define RTC_2412 0x02
+
+/* bits in control D register */
+#define RTC_VRT 0x80
+
+/* bank 1 only registers */
+#define RTC_MODEL 0x40
+#define RTC_CENTURY 0x48
+#define RTC_RAM_ADDR 0x50
+#define RTC_RAM_DATA 0x53
+
+struct rtc_plat_data {
+ struct rtc_device *rtc;
+ void __iomem *ioaddr;
+ size_t size;
+ resource_size_t baseaddr;
+ unsigned long last_jiffies;
+};
+
+static int ds1685_rtc_set_time(struct device *dev, struct rtc_time *tm)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
+ void __iomem *ioaddr = pdata->ioaddr;
+ unsigned int ctrla, ctrlb;
+
+ /* set SET bit */
+ ctrlb = readb(ioaddr + RTC_CONTROLB);
+ ctrlb |= RTC_SET;
+ writeb(ctrlb, ioaddr + RTC_CONTROLB);
+
+ writeb(bin2bcd(tm->tm_year % 100), ioaddr + RTC_YEAR);
+ writeb(bin2bcd(tm->tm_mon + 1), ioaddr + RTC_MONTH);
+ writeb(bin2bcd(tm->tm_wday), ioaddr + RTC_DAY);
+ writeb(bin2bcd(tm->tm_mday), ioaddr + RTC_DATE);
+ writeb(bin2bcd(tm->tm_hour), ioaddr + RTC_HOURS);
+ writeb(bin2bcd(tm->tm_min), ioaddr + RTC_MINUTES);
+ writeb(bin2bcd(tm->tm_sec), ioaddr + RTC_SECONDS);
+
+ /* switch to 2nd bank */
+ ctrla = readb(ioaddr + RTC_CONTROLA);
+ ctrla |= RTC_DV0;
+ writeb(ctrla, ioaddr + RTC_CONTROLA);
+
+ writeb(bin2bcd((tm->tm_year + 1900) / 100), ioaddr + RTC_CENTURY);
+
+ /* switch back to original bank */
+ ctrla &= ~RTC_DV0;
+ writeb(ctrla, ioaddr + RTC_CONTROLA);
+
+ /* clear SET bit */
+ ctrlb &= ~RTC_SET;
+ writeb(ctrlb, ioaddr + RTC_CONTROLB);
+
+ return 0;
+}
+
+static int ds1685_rtc_read_time(struct device *dev, struct rtc_time *tm)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
+ void __iomem *ioaddr = pdata->ioaddr;
+ unsigned int century, year, month, day, hour, minute, second, week;
+ unsigned int ctrla, ctrlb;
+
+ /* give enough time to update RTC in case of continuous read */
+ if (pdata->last_jiffies == jiffies)
+ msleep(1);
+ pdata->last_jiffies = jiffies;
+
+ /* set SET bit */
+ ctrlb = readb(ioaddr + RTC_CONTROLB);
+ ctrlb |= RTC_SET;
+ writeb(ctrlb, ioaddr + RTC_CONTROLB);
+
+ second = readb(ioaddr + RTC_SECONDS);
+ minute = readb(ioaddr + RTC_MINUTES);
+ hour = readb(ioaddr + RTC_HOURS);
+ day = readb(ioaddr + RTC_DATE);
+ week = readb(ioaddr + RTC_DAY);
+ month = readb(ioaddr + RTC_MONTH);
+ year = readb(ioaddr + RTC_YEAR);
+
+ /* switch to 2nd bank */
+ ctrla = readb(ioaddr + RTC_CONTROLA);
+ ctrla |= RTC_DV0;
+ writeb(ctrla, ioaddr + RTC_CONTROLA);
+
+ century = readb(ioaddr + RTC_CENTURY);
+
+ /* switch back to original bank */
+ ctrla &= ~RTC_DV0;
+ writeb(ctrla, ioaddr + RTC_CONTROLA);
+
+ /* clear SET bit */
+ ctrlb &= ~RTC_SET;
+ writeb(ctrlb, ioaddr + RTC_CONTROLB);
+
+ tm->tm_sec = bcd2bin(second);
+ tm->tm_min = bcd2bin(minute);
+ tm->tm_hour = bcd2bin(hour);
+ tm->tm_mday = bcd2bin(day);
+ tm->tm_wday = bcd2bin(week);
+ tm->tm_mon = bcd2bin(month) - 1;
+
+ /* year is 1900 + tm->tm_year */
+ tm->tm_year = bcd2bin(year) + bcd2bin(century) * 100 - 1900;
+
+ return rtc_valid_tm(tm);
+}
+
+static int ds1685_get_ssn(struct rtc_plat_data *pdata, u8 *ssn)
+{
+ void __iomem *ioaddr = pdata->ioaddr;
+ int i;
+ unsigned int ctrl;
+
+ /* switch to 2nd bank */
+ ctrl = readb(ioaddr + RTC_CONTROLA);
+ ctrl |= RTC_DV0;
+ writeb(ctrl, ioaddr + RTC_CONTROLA);
+
+ /* read silicon serial number */
+ for (i = 0; i < 8; i++)
+ ssn[i] = readb(ioaddr + RTC_MODEL + i);
+
+ /* switch back to original bank */
+ ctrl &= ~RTC_DV0;
+ writeb(ctrl, ioaddr + RTC_CONTROLA);
+
+ return 0;
+}
+
+static int ds1685_rtc_proc(struct device *dev, struct seq_file *seq)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
+ void __iomem *ioaddr = pdata->ioaddr;
+ unsigned int val;
+ u8 ssn[8];
+
+ mutex_lock(&pdata->rtc->ops_lock);
+ val = readb(ioaddr + RTC_CONTROLD);
+ ds1685_get_ssn(pdata, ssn);
+ mutex_unlock(&pdata->rtc->ops_lock);
+
+ seq_printf(seq, "battery\t\t: %s\n",
+ (val & RTC_VRT) ? "ok" : "exhausted");
+ seq_printf(seq, "serial#\t\t: "
+ "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
+ ssn[0], ssn[1], ssn[2], ssn[3],
+ ssn[4], ssn[5], ssn[6], ssn[7]);
+ return 0;
+}
+
+static const struct rtc_class_ops ds1685_rtc_ops = {
+ .proc = ds1685_rtc_proc,
+ .read_time = ds1685_rtc_read_time,
+ .set_time = ds1685_rtc_set_time,
+};
+
+static ssize_t ds1685_nvram_read(struct kobject *kobj,
+ struct bin_attribute *bin_attr,
+ char *buf, loff_t pos, size_t size)
+{
+ struct platform_device *pdev =
+ to_platform_device(container_of(kobj, struct device, kobj));
+ struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
+ void __iomem *ioaddr = pdata->ioaddr;
+ ssize_t count;
+
+ mutex_lock(&pdata->rtc->ops_lock);
+ for (count = 0; size > 0 && pos < NVRAM_SIZE_B0; count++, size--)
+ *buf++ = readb(ioaddr + RTC_NVRAM_START_B0 + pos++);
+
+ if (size > 0) {
+ unsigned int ctrl = readb(ioaddr + RTC_CONTROLA);
+ /* switch to 2nd bank */
+ ctrl |= RTC_DV0;
+ writeb(ctrl, ioaddr + RTC_CONTROLA);
+
+ for (count = 0; size > 0 && pos < NVRAM_SIZE; count++, size--) {
+ writeb(pos - NVRAM_SIZE_B0, ioaddr + RTC_RAM_ADDR);
+ *buf++ = readb(ioaddr + RTC_RAM_DATA);
+ pos++;
+ }
+
+ /* switch back to original bank */
+ ctrl &= ~RTC_DV0;
+ writeb(ctrl, ioaddr + RTC_CONTROLA);
+ }
+ mutex_unlock(&pdata->rtc->ops_lock);
+ return count;
+}
+
+static ssize_t ds1685_nvram_write(struct kobject *kobj,
+ struct bin_attribute *bin_attr,
+ char *buf, loff_t pos, size_t size)
+{
+ struct platform_device *pdev =
+ to_platform_device(container_of(kobj, struct device, kobj));
+ struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
+ void __iomem *ioaddr = pdata->ioaddr;
+ ssize_t count;
+
+ mutex_lock(&pdata->rtc->ops_lock);
+ for (count = 0; size > 0 && pos < NVRAM_SIZE_B0; count++, size--)
+ writeb(*buf++, ioaddr + RTC_NVRAM_START_B0 + pos++);
+
+ if (size > 0) {
+ unsigned int ctrl = readb(ioaddr + RTC_CONTROLA);
+ /* switch to 2nd bank */
+ ctrl |= RTC_DV0;
+ writeb(ctrl, ioaddr + RTC_CONTROLA);
+
+ for (count = 0; size > 0 && pos < NVRAM_SIZE; count++, size--) {
+ writeb(pos - NVRAM_SIZE_B0, ioaddr + RTC_RAM_ADDR);
+ writeb(*buf++, ioaddr + RTC_RAM_DATA);
+ pos++;
+ }
+
+ /* switch back to original bank */
+ ctrl &= ~RTC_DV0;
+ writeb(ctrl, ioaddr + RTC_CONTROLA);
+ }
+ mutex_unlock(&pdata->rtc->ops_lock);
+
+ return count;
+}
+
+static struct bin_attribute ds1685_nvram_attr = {
+ .attr = {
+ .name = "nvram",
+ .mode = S_IRUGO | S_IWUSR,
+ },
+ .read = ds1685_nvram_read,
+ .write = ds1685_nvram_write,
+ .size = NVRAM_SIZE
+};
+
+static ssize_t
+ds1685_sysfs_show_battery(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
+ void __iomem *ioaddr = pdata->ioaddr;
+ unsigned int val;
+
+ mutex_lock(&pdata->rtc->ops_lock);
+ val = readb(ioaddr + RTC_CONTROLD);
+ mutex_unlock(&pdata->rtc->ops_lock);
+
+ return sprintf(buf, "%s\n", (val & RTC_VRT) ? "ok" : "exhausted");
+}
+
+static DEVICE_ATTR(battery, S_IRUGO, ds1685_sysfs_show_battery, NULL);
+
+static ssize_t
+ds1685_sysfs_show_serial(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
+ u8 ssn[8];
+
+ mutex_lock(&pdata->rtc->ops_lock);
+ ds1685_get_ssn(pdata, ssn);
+ mutex_unlock(&pdata->rtc->ops_lock);
+
+ return sprintf(buf, "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
+ ssn[0], ssn[1], ssn[2], ssn[3],
+ ssn[4], ssn[5], ssn[6], ssn[7]);
+}
+
+static DEVICE_ATTR(serial, S_IRUGO, ds1685_sysfs_show_serial, NULL);
+
+static int ds1685_sysfs_register(struct device *dev)
+{
+ int err;
+
+ err = sysfs_create_bin_file(&dev->kobj, &ds1685_nvram_attr);
+ if (err)
+ return err;
+
+ err = device_create_file(dev, &dev_attr_battery);
+ if (err) {
+ sysfs_remove_bin_file(&dev->kobj, &ds1685_nvram_attr);
+ return err;
+ }
+
+ err = device_create_file(dev, &dev_attr_serial);
+ if (err) {
+ device_remove_file(dev, &dev_attr_battery);
+ sysfs_remove_bin_file(&dev->kobj, &ds1685_nvram_attr);
+ return err;
+ }
+
+ return 0;
+}
+
+static int ds1685_sysfs_unregister(struct device *dev)
+{
+ sysfs_remove_bin_file(&dev->kobj, &ds1685_nvram_attr);
+ device_remove_file(dev, &dev_attr_battery);
+ device_remove_file(dev, &dev_attr_serial);
+
+ return 0;
+}
+
+static int __init ds1685_rtc_probe(struct platform_device *pdev)
+{
+ struct rtc_device *rtc;
+ struct resource *res;
+ unsigned int ctrl;
+ struct rtc_plat_data *pdata = NULL;
+ void __iomem *ioaddr = NULL;
+ int ret = 0;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res)
+ return -ENODEV;
+
+ pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return -ENOMEM;
+
+ pdata->size = resource_size(res);
+ if (!request_mem_region(res->start, pdata->size, pdev->name)) {
+ ret = -EBUSY;
+ goto out;
+ }
+ pdata->baseaddr = res->start;
+
+ ioaddr = ioremap(pdata->baseaddr, pdata->size);
+ if (!ioaddr) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ pdata->ioaddr = ioaddr;
+
+ /* turn RTC on if it was not on */
+ ctrl = readb(ioaddr + RTC_CONTROLA);
+ if (!(ctrl & RTC_DV1)) {
+ dev_warn(&pdev->dev,
+ "oscillator stop detected - enabled!\n");
+ ctrl |= RTC_DV1;
+ }
+ ctrl &= ~RTC_DV2;
+ ctrl &= ~RTC_DV0; /* enable original bank */
+ writeb(ctrl, ioaddr + RTC_CONTROLA);
+
+ if (!(readb(ioaddr + RTC_CONTROLD) & RTC_VRT))
+ dev_warn(&pdev->dev, "low battery detected.\n");
+
+ ctrl = readb(ioaddr + RTC_CONTROLB);
+ if ((ctrl & RTC_DM) || (!(ctrl & RTC_2412))) {
+ dev_dbg(&pdev->dev, "only 24-hr BCD mode supported\n");
+ ret = -ENXIO;
+ goto out;
+ }
+
+ rtc = rtc_device_register(pdev->name, &pdev->dev,
+ &ds1685_rtc_ops, THIS_MODULE);
+ if (IS_ERR(rtc)) {
+ ret = PTR_ERR(rtc);
+ goto out;
+ }
+ pdata->rtc = rtc;
+ pdata->last_jiffies = jiffies;
+ platform_set_drvdata(pdev, pdata);
+ ret = ds1685_sysfs_register(&pdev->dev);
+ if (ret)
+ goto out;
+ return 0;
+ out:
+ if (pdata->rtc)
+ rtc_device_unregister(pdata->rtc);
+ if (pdata->ioaddr)
+ iounmap(pdata->ioaddr);
+ if (pdata->baseaddr)
+ release_mem_region(pdata->baseaddr, pdata->size);
+ kfree(pdata);
+ return ret;
+}
+
+static int __exit ds1685_rtc_remove(struct platform_device *pdev)
+{
+ struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
+
+ ds1685_sysfs_unregister(&pdev->dev);
+ rtc_device_unregister(pdata->rtc);
+ iounmap(pdata->ioaddr);
+ release_mem_region(pdata->baseaddr, pdata->size);
+ kfree(pdata);
+ return 0;
+}
+
+static struct platform_driver ds1685_rtc_driver = {
+ .remove = __exit_p(ds1685_rtc_remove),
+ .driver = {
+ .name = "rtc-ds1685",
+ .owner = THIS_MODULE,
+ },
+};
+
+static __init int ds1685_init(void)
+{
+ return platform_driver_probe(&ds1685_rtc_driver, ds1685_rtc_probe);
+}
+
+static __exit void ds1685_exit(void)
+{
+ platform_driver_unregister(&ds1685_rtc_driver);
+}
+
+module_init(ds1685_init);
+module_exit(ds1685_exit);
+
+MODULE_AUTHOR("Matthias Fuchs <matthias.fuchs@esd-electronics.com>");
+MODULE_DESCRIPTION("Dallas DS1685/DS1687 RTC driver");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DRV_VERSION);
+MODULE_ALIAS("platform:rtc-ds1685");