drivers/watchdog/mpc8xxx_wdt.c

72 static void mpc8xxx_wdt_keepalive(struct mpc8xxx_wdt_ddata *ddata)
75 	spin_lock(&ddata->lock);
76 	out_be16(&ddata->base->swsrr, 0x556c);
77 	out_be16(&ddata->base->swsrr, 0xaa39);
78 	spin_unlock(&ddata->lock);
83 	struct mpc8xxx_wdt_ddata *ddata =
85 	u32 tmp = in_be32(&ddata->base->swcrr);
89 	tmp |= SWCRR_SWEN | SWCRR_SWPR | (ddata->swtc << 16);
94 	out_be32(&ddata->base->swcrr, tmp);
96 	tmp = in_be32(&ddata->base->swcrr);
100 	ddata->swtc = tmp >> 16;
101 	set_bit(WDOG_HW_RUNNING, &ddata->wdd.status);
108 	struct mpc8xxx_wdt_ddata *ddata =
111 	mpc8xxx_wdt_keepalive(ddata);
132 	struct mpc8xxx_wdt_ddata *ddata;
144 	ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL);
145 	if (!ddata)
148 	ddata->base = devm_platform_ioremap_resource(ofdev, 0);
149 	if (IS_ERR(ddata->base))
150 		return PTR_ERR(ddata->base);
152 	enabled = in_be32(&ddata->base->swcrr) & SWCRR_SWEN;
167 		ddata->wdd.bootstatus = status ? WDIOF_CARDRESET : 0;
176 	spin_lock_init(&ddata->lock);
178 	ddata->wdd.info = &mpc8xxx_wdt_info;
179 	ddata->wdd.ops = &mpc8xxx_wdt_ops;
181 	ddata->wdd.timeout = WATCHDOG_TIMEOUT;
182 	watchdog_init_timeout(&ddata->wdd, timeout, dev);
184 	watchdog_set_nowayout(&ddata->wdd, nowayout);
186 	ddata->swtc = min(ddata->wdd.timeout * freq / wdt_type->prescaler,
195 		mpc8xxx_wdt_start(&ddata->wdd);
197 	ddata->wdd.max_hw_heartbeat_ms = (ddata->swtc * wdt_type->prescaler) /
199 	ddata->wdd.min_timeout = ddata->wdd.max_hw_heartbeat_ms / 1000;
200 	if (ddata->wdd.timeout < ddata->wdd.min_timeout)
201 		ddata->wdd.timeout = ddata->wdd.min_timeout;
203 	ret = devm_watchdog_register_device(dev, &ddata->wdd);
209 		 reset ? "reset" : "interrupt", ddata->wdd.timeout);
211 	platform_set_drvdata(ofdev, ddata);