1 // SPDX-License-Identifier: GPL-2.0
19  * Base of the WDT registers, from the timer base address.  There are
21  * timer), at bases 0x100 + (WDT ID) * 0x20, where WDT ID is 0 through 4.
28  * Register base of the timer that's selected for pairing with the watchdog.
29  * This driver arbitrarily uses timer 5, which is currently unused by
31  * needs to change, take care that the new timer is not used by the
54 /* Timer registers */
91 	writel(val, wdt->tmr_regs + TIMER_PTV);  in tegra_wdt_start()
101 	      (wdd->timeout << WDT_CFG_PERIOD_SHIFT) |  in tegra_wdt_start()
103 	writel(val, wdt->wdt_regs + WDT_CFG);  in tegra_wdt_start()
105 	writel(WDT_CMD_START_COUNTER, wdt->wdt_regs + WDT_CMD);  in tegra_wdt_start()
114 	writel(WDT_UNLOCK_PATTERN, wdt->wdt_regs + WDT_UNLOCK);  in tegra_wdt_stop()
115 	writel(WDT_CMD_DISABLE_COUNTER, wdt->wdt_regs + WDT_CMD);  in tegra_wdt_stop()
116 	writel(0, wdt->tmr_regs + TIMER_PTV);  in tegra_wdt_stop()
125 	writel(WDT_CMD_START_COUNTER, wdt->wdt_regs + WDT_CMD);  in tegra_wdt_ping()
133 	wdd->timeout = timeout;  in tegra_wdt_set_timeout()
150 	val = readl(wdt->wdt_regs + WDT_STS);  in tegra_wdt_get_timeleft()
162 	return (((3 - exp) * wdd->timeout) + count) / 4;  in tegra_wdt_get_timeleft()
184 	struct device *dev = &pdev->dev;  in tegra_wdt_probe()
190 	/* This is the timer base. */  in tegra_wdt_probe()
201 		return -ENOMEM;  in tegra_wdt_probe()
204 	wdt->wdt_regs = regs + WDT_BASE;  in tegra_wdt_probe()
205 	wdt->tmr_regs = regs + WDT_TIMER_BASE;  in tegra_wdt_probe()
208 	wdd = &wdt->wdd;  in tegra_wdt_probe()
209 	wdd->timeout = heartbeat;  in tegra_wdt_probe()
210 	wdd->info = &tegra_wdt_info;  in tegra_wdt_probe()
211 	wdd->ops = &tegra_wdt_ops;  in tegra_wdt_probe()
212 	wdd->min_timeout = MIN_WDT_TIMEOUT;  in tegra_wdt_probe()
213 	wdd->max_timeout = MAX_WDT_TIMEOUT;  in tegra_wdt_probe()
214 	wdd->parent = dev;  in tegra_wdt_probe()
237 	if (watchdog_active(&wdt->wdd))  in tegra_wdt_suspend()
238 		tegra_wdt_stop(&wdt->wdd);  in tegra_wdt_suspend()
247 	if (watchdog_active(&wdt->wdd))  in tegra_wdt_resume()
248 		tegra_wdt_start(&wdt->wdd);  in tegra_wdt_resume()
254 	{ .compatible = "nvidia,tegra30-timer", },
265 		.name	= "tegra-wdt",