watchdog: sp5100_tco: Add support for get_timeleft

Tested on a Gigabyte X570 I AORUS PRO WIFI.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20210928065735.548966-1-linux@weissschuh.net
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>

diff --git a/drivers/watchdog/sp5100_tco.c b/drivers/watchdog/sp5100_tco.c
index a730ecb..dd9a744 100644 (file)
--- a/drivers/watchdog/sp5100_tco.c
+++ b/drivers/watchdog/sp5100_tco.c
@@ -10,6 +10,7 @@
  *                             https://www.kernelconcepts.de
  *
  *     See AMD Publication 43009 "AMD SB700/710/750 Register Reference Guide",
+ *         AMD Publication 44413 "AMD SP5100 Register Reference Guide"
  *         AMD Publication 45482 "AMD SB800-Series Southbridges Register
  *                                                           Reference Guide"
  *         AMD Publication 48751 "BIOS and Kernel Developer’s Guide (BKDG)
@@ -144,6 +145,13 @@ static int tco_timer_set_timeout(struct watchdog_device *wdd,
        return 0;
 }
 
+static unsigned int tco_timer_get_timeleft(struct watchdog_device *wdd)
+{
+       struct sp5100_tco *tco = watchdog_get_drvdata(wdd);
+
+       return readl(SP5100_WDT_COUNT(tco->tcobase));
+}
+
 static u8 sp5100_tco_read_pm_reg8(u8 index)
 {
        outb(index, SP5100_IO_PM_INDEX_REG);
@@ -386,6 +394,7 @@ static const struct watchdog_ops sp5100_tco_wdt_ops = {
        .stop = tco_timer_stop,
        .ping = tco_timer_ping,
        .set_timeout = tco_timer_set_timeout,
+       .get_timeleft = tco_timer_get_timeleft,
 };
 
 static int sp5100_tco_probe(struct platform_device *pdev)