@@ -799,6 +799,13 @@ config RTC_DRV_PCF2127
This driver can also be built as a module. If so, the module
will be called rtc-pcf2127.
+config RTC_DRV_PCF2127_WDT
+ bool "NXP PCF2127 watchdog timer"
+ depends on RTC_DRV_PCF2127
+ help
+ If you say Y here you will get support for the
+ watchdog timer in the NXP PCF2127 chip real-time clock chips.
+
config RTC_DRV_RV3029C2
tristate "Micro Crystal RV3029/3049"
depends on RTC_I2C_AND_SPI
@@ -21,6 +21,13 @@
#include <linux/module.h>
#include <linux/of.h>
#include <linux/regmap.h>
+#ifdef CONFIG_RTC_DRV_PCF2127_WDT
+#include <linux/fs.h>
+#include <linux/ioctl.h>
+#include <linux/miscdevice.h>
+#include <linux/reboot.h>
+#include <linux/watchdog.h>
+#endif
#define PCF2127_REG_CTRL1 (0x00) /* Control Register 1 */
#define PCF2127_REG_CTRL2 (0x01) /* Control Register 2 */
@@ -28,6 +35,13 @@
#define PCF2127_REG_CTRL3 (0x02) /* Control Register 3 */
#define PCF2127_REG_CTRL3_BLF BIT(2)
+#define PCF2127_REG_WDG_TIMCTL (0x10)
+#define PCF2127_REG_WDG_TIMCTL_CD (BIT(7) | BIT(6))
+#define PCF2127_REG_WDG_T_CD_EN_RST (BIT(7) | BIT(6))/* WD en,rst assert */
+#define PCF2127_REG_WDG_TIMCTL_TF (BIT(1) | BIT(0))
+#define PCF2127_REG_WDG_T_TF_1HZ BIT(1) /* Timer clock source */
+#define PCF2127_REG_WDG_TIMVAL (0x11)
+
#define PCF2127_REG_SC (0x03) /* datetime */
#define PCF2127_REG_MN (0x04)
#define PCF2127_REG_HR (0x05)
@@ -43,6 +57,137 @@ struct pcf2127 {
struct regmap *regmap;
};
+#ifdef CONFIG_RTC_DRV_PCF2127_WDT
+static struct pcf2127 *save_pcf2127;
+
+/* default 32 sec timeout */
+#define WD_TIMO 32
+
+static int wdt_margin = WD_TIMO;
+
+static const struct watchdog_info pcf2127_wdt_info = {
+ .identity = "PCF2127 WDT",
+ .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT,
+};
+
+static int pcf2127_wdt_enable(void)
+{
+ return regmap_write(save_pcf2127->regmap, PCF2127_REG_WDG_TIMCTL,
+ PCF2127_REG_WDG_T_CD_EN_RST | PCF2127_REG_WDG_T_TF_1HZ);
+}
+
+static int pcf2127_wdt_settimeout(unsigned int timeout)
+{
+ int err;
+
+ err = pcf2127_wdt_enable();
+ if (err)
+ return err;
+
+ err = regmap_write(save_pcf2127->regmap, PCF2127_REG_WDG_TIMVAL,
+ timeout);
+ if (err)
+ return err;
+
+ return 0;
+}
+
+static void pcf2127_wdt_ping(void)
+{
+ int ret = 0;
+
+ ret = pcf2127_wdt_settimeout(wdt_margin);
+ if (ret)
+ pr_info("WD TICK FAIL!!!!!!!!!! %i\n", ret);
+}
+
+static int pcf2127_wdt_disable(void)
+{
+ return regmap_write_bits(save_pcf2127->regmap, PCF2127_REG_WDG_TIMCTL,
+ PCF2127_REG_WDG_TIMCTL_CD, 0x00);
+}
+
+static long pcf2127_wdt_unlocked_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ int new_margin, options;
+
+ switch (cmd) {
+ case WDIOC_GETSUPPORT:
+ return copy_to_user((struct watchdog_info __user *)arg,
+ &pcf2127_wdt_info,
+ sizeof(pcf2127_wdt_info)) ? -EFAULT : 0;
+ case WDIOC_SETOPTIONS:
+ if (copy_from_user(&options, (int __user *)arg, sizeof(int)))
+ return -EFAULT;
+
+ if (options & WDIOS_DISABLECARD) {
+ pr_info("disable watchdog\n");
+ if (pcf2127_wdt_disable())
+ return -EFAULT;
+ }
+
+ if (options & WDIOS_ENABLECARD) {
+ pr_info("enable watchdog\n");
+ pcf2127_wdt_settimeout(wdt_margin);
+ pcf2127_wdt_ping();
+ }
+
+ return -EINVAL;
+ case WDIOC_KEEPALIVE:
+ pcf2127_wdt_ping();
+ return 0;
+ case WDIOC_SETTIMEOUT:
+ if (get_user(new_margin, (int __user *)arg))
+ return -EFAULT;
+
+ if (new_margin < 1 || new_margin > 255)
+ return -EINVAL;
+
+ wdt_margin = new_margin;
+ if (pcf2127_wdt_settimeout(new_margin))
+ return -EFAULT;
+ pcf2127_wdt_ping();
+ /* fallthrough */
+ case WDIOC_GETTIMEOUT:
+ return put_user(wdt_margin, (int __user *)arg);
+ default:
+ return -ENOTTY;
+ }
+}
+
+static ssize_t pcf2127_wdt_write(struct file *file, const char *data,
+ size_t len, loff_t *ppos)
+{
+ if (len) {
+ pcf2127_wdt_ping();
+ return 1;
+ }
+ return 0;
+}
+
+static ssize_t pcf2127_wdt_read(struct file *file, char __user *data,
+ size_t len, loff_t *ppos)
+{
+ return 0;
+}
+
+static const struct file_operations pcf2127_wdt_fops = {
+ .owner = THIS_MODULE,
+ .read = pcf2127_wdt_read,
+ .unlocked_ioctl = pcf2127_wdt_unlocked_ioctl,
+ .write = pcf2127_wdt_write,
+ .llseek = no_llseek,
+};
+
+static struct miscdevice pcf2127_wdt_miscdev = {
+ .minor = WATCHDOG_MINOR,
+ .name = "watchdog",
+ .fops = &pcf2127_wdt_fops,
+};
+
+#endif
+
/*
* In the routines that deal directly with the pcf2127 hardware, we use
* rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch.
@@ -175,6 +320,9 @@ static const struct rtc_class_ops pcf2127_rtc_ops = {
static int pcf2127_probe(struct device *dev, struct regmap *regmap,
const char *name)
{
+#ifdef CONFIG_RTC_DRV_PCF2127_WDT
+ int ret;
+#endif
struct pcf2127 *pcf2127;
dev_dbg(dev, "%s\n", __func__);
@@ -190,7 +338,24 @@ static int pcf2127_probe(struct device *dev, struct regmap *regmap,
pcf2127->rtc = devm_rtc_device_register(dev, name, &pcf2127_rtc_ops,
THIS_MODULE);
- return PTR_ERR_OR_ZERO(pcf2127->rtc);
+ if (IS_ERR(pcf2127->rtc))
+ return PTR_ERR_OR_ZERO(pcf2127->rtc);
+
+#ifdef CONFIG_RTC_DRV_PCF2127_WDT
+ if (!of_device_is_compatible(dev->of_node, "nxp,pcf2127"))
+ return 0;
+
+ save_pcf2127 = pcf2127;
+
+ if (of_property_read_bool(dev->of_node, "watchdog")) {
+ ret = misc_register(&pcf2127_wdt_miscdev);
+ if (ret)
+ return ret;
+ }
+ pcf2127_wdt_settimeout(32);
+#endif
+
+ return 0;
}
#ifdef CONFIG_OF
@@ -427,6 +592,10 @@ static void __exit pcf2127_exit(void)
{
pcf2127_spi_unregister_driver();
pcf2127_i2c_unregister_driver();
+
+#ifdef CONFIG_RTC_DRV_PCF2127_WDT
+ misc_deregister(&pcf2127_wdt_miscdev);
+#endif
}
module_exit(pcf2127_exit)