.owner = THIS_MODULE,
};
+/*
+ * The A0 version of the IXP422 had a bug in the watchdog making
+ * is useless, but we still need to use it to restart the system
+ * as it is the only way, so in this special case we register a
+ * "dummy" watchdog that doesn't really work, but will support
+ * the restart operation.
+ */
+static int ixp4xx_wdt_dummy(struct watchdog_device *wdd)
+{
+ return 0;
+}
+
+static const struct watchdog_ops ixp4xx_wdt_restart_only_ops = {
+ .start = ixp4xx_wdt_dummy,
+ .stop = ixp4xx_wdt_dummy,
+ .restart = ixp4xx_wdt_restart,
+ .owner = THIS_MODULE,
+};
+
static const struct watchdog_info ixp4xx_wdt_info = {
.options = WDIOF_KEEPALIVEPING
| WDIOF_MAGICCLOSE
static int ixp4xx_wdt_probe(struct platform_device *pdev)
{
+ static const struct watchdog_ops *iwdt_ops;
struct device *dev = &pdev->dev;
struct ixp4xx_wdt *iwdt;
struct clk *clk;
int ret;
if (!(read_cpuid_id() & 0xf) && !cpu_is_ixp46x()) {
- dev_err(dev, "Rev. A0 IXP42x CPU detected - watchdog disabled\n");
- return -ENODEV;
+ dev_info(dev, "Rev. A0 IXP42x CPU detected - only restart supported\n");
+ iwdt_ops = &ixp4xx_wdt_restart_only_ops;
+ } else {
+ iwdt_ops = &ixp4xx_wdt_ops;
}
iwdt = devm_kzalloc(dev, sizeof(*iwdt), GFP_KERNEL);
iwdt->rate = IXP4XX_TIMER_FREQ;
iwdt->wdd.info = &ixp4xx_wdt_info;
- iwdt->wdd.ops = &ixp4xx_wdt_ops;
+ iwdt->wdd.ops = iwdt_ops;
iwdt->wdd.min_timeout = 1;
iwdt->wdd.max_timeout = U32_MAX / iwdt->rate;
iwdt->wdd.parent = dev;