watchdog: armada_37xx: Probe driver also when watchdog is already running
If Armada 37xx watchdog is started before U-Boot then CNTR_CTRL_ACTIVE bit
is set, U-Boot armada-37xx-wdt.c driver fails to initialize and so U-Boot
is unable to use or kick this watchdog.
Do not check for CNTR_CTRL_ACTIVE bit and always initialize watchdog. Same
behavior is implemented in Linux kernel driver.
This change allows to activate watchdog in firmware which loads U-Boot.
Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Stefan Roese <sr@denx.de>
diff --git a/drivers/watchdog/armada-37xx-wdt.c b/drivers/watchdog/armada-37xx-wdt.c
index 2e119b9..bacebbc 100644
--- a/drivers/watchdog/armada-37xx-wdt.c
+++ b/drivers/watchdog/armada-37xx-wdt.c
@@ -58,13 +58,11 @@
clrbits_le32(priv->reg + CNTR_CTRL(id), CNTR_CTRL_ENABLE);
}
-static int init_counter(struct a37xx_wdt *priv, int id, u32 mode, u32 trig_src)
+static void init_counter(struct a37xx_wdt *priv, int id, u32 mode, u32 trig_src)
{
u32 reg;
reg = readl(priv->reg + CNTR_CTRL(id));
- if (reg & CNTR_CTRL_ACTIVE)
- return -EBUSY;
reg &= ~(CNTR_CTRL_MODE_MASK | CNTR_CTRL_PRESCALE_MASK |
CNTR_CTRL_TRIG_SRC_MASK);
@@ -79,8 +77,6 @@
reg |= trig_src;
writel(reg, priv->reg + CNTR_CTRL(id));
-
- return 0;
}
static int a37xx_wdt_reset(struct udevice *dev)
@@ -116,16 +112,9 @@
static int a37xx_wdt_start(struct udevice *dev, u64 ms, ulong flags)
{
struct a37xx_wdt *priv = dev_get_priv(dev);
- int err;
-
- err = init_counter(priv, 0, CNTR_CTRL_MODE_ONESHOT, 0);
- if (err < 0)
- return err;
- err = init_counter(priv, 1, CNTR_CTRL_MODE_HWSIG,
- CNTR_CTRL_TRIG_SRC_PREV_CNTR);
- if (err < 0)
- return err;
+ init_counter(priv, 0, CNTR_CTRL_MODE_ONESHOT, 0);
+ init_counter(priv, 1, CNTR_CTRL_MODE_HWSIG, CNTR_CTRL_TRIG_SRC_PREV_CNTR);
priv->timeout = ms * priv->clk_rate / 1000 / CNTR_CTRL_PRESCALE_MIN;