Lines Matching +full:probe +full:- +full:reset
1 // SPDX-License-Identifier: GPL-2.0+
3 * drivers/char/watchdog/sp805-wdt.c
28 #include <linux/reset.h>
37 #define MODULE_NAME "sp805-wdt"
86 u32 wdtcontrol = readl_relaxed(wdt->base + WDTCONTROL); in wdt_is_running()
91 /* This routine finds load value that will reset system in required timeout */
97 rate = wdt->rate; in wdt_setload()
105 load = div_u64(rate, 2) * timeout - 1; in wdt_setload()
110 spin_lock(&wdt->lock); in wdt_setload()
111 wdt->load_val = load; in wdt_setload()
113 wdd->timeout = div_u64((load + 1) * 2 + (rate / 2), rate); in wdt_setload()
114 spin_unlock(&wdt->lock); in wdt_setload()
119 /* returns number of seconds left for reset to occur */
125 spin_lock(&wdt->lock); in wdt_timeleft()
126 load = readl_relaxed(wdt->base + WDTVALUE); in wdt_timeleft()
129 if (!(readl_relaxed(wdt->base + WDTRIS) & INT_MASK)) in wdt_timeleft()
130 load += (u64)wdt->load_val + 1; in wdt_timeleft()
131 spin_unlock(&wdt->lock); in wdt_timeleft()
133 return div_u64(load, wdt->rate); in wdt_timeleft()
141 writel_relaxed(UNLOCK, wdt->base + WDTLOCK); in wdt_restart()
142 writel_relaxed(0, wdt->base + WDTCONTROL); in wdt_restart()
143 writel_relaxed(0, wdt->base + WDTLOAD); in wdt_restart()
144 writel_relaxed(INT_ENABLE | RESET_ENABLE, wdt->base + WDTCONTROL); in wdt_restart()
147 readl_relaxed(wdt->base + WDTLOCK); in wdt_restart()
159 ret = clk_prepare_enable(wdt->clk); in wdt_config()
161 dev_err(&wdt->adev->dev, "clock enable fail"); in wdt_config()
166 spin_lock(&wdt->lock); in wdt_config()
168 writel_relaxed(UNLOCK, wdt->base + WDTLOCK); in wdt_config()
169 writel_relaxed(wdt->load_val, wdt->base + WDTLOAD); in wdt_config()
170 writel_relaxed(INT_MASK, wdt->base + WDTINTCLR); in wdt_config()
173 writel_relaxed(INT_ENABLE | RESET_ENABLE, wdt->base + in wdt_config()
176 writel_relaxed(LOCK, wdt->base + WDTLOCK); in wdt_config()
179 readl_relaxed(wdt->base + WDTLOCK); in wdt_config()
180 spin_unlock(&wdt->lock); in wdt_config()
190 /* enables watchdog timers reset */
196 /* disables watchdog timers reset */
201 spin_lock(&wdt->lock); in wdt_disable()
203 writel_relaxed(UNLOCK, wdt->base + WDTLOCK); in wdt_disable()
204 writel_relaxed(0, wdt->base + WDTCONTROL); in wdt_disable()
205 writel_relaxed(LOCK, wdt->base + WDTLOCK); in wdt_disable()
208 readl_relaxed(wdt->base + WDTLOCK); in wdt_disable()
209 spin_unlock(&wdt->lock); in wdt_disable()
211 clk_disable_unprepare(wdt->clk); in wdt_disable()
239 wdt = devm_kzalloc(&adev->dev, sizeof(*wdt), GFP_KERNEL); in sp805_wdt_probe()
241 ret = -ENOMEM; in sp805_wdt_probe()
245 wdt->base = devm_ioremap_resource(&adev->dev, &adev->res); in sp805_wdt_probe()
246 if (IS_ERR(wdt->base)) in sp805_wdt_probe()
247 return PTR_ERR(wdt->base); in sp805_wdt_probe()
250 * When driver probe with ACPI device, clock devices in sp805_wdt_probe()
252 * clock-frequency property given in _DSD object. in sp805_wdt_probe()
254 device_property_read_u64(&adev->dev, "clock-frequency", &rate); in sp805_wdt_probe()
256 wdt->clk = devm_clk_get_optional(&adev->dev, NULL); in sp805_wdt_probe()
257 if (IS_ERR(wdt->clk)) in sp805_wdt_probe()
258 return dev_err_probe(&adev->dev, PTR_ERR(wdt->clk), "Clock not found\n"); in sp805_wdt_probe()
260 wdt->rate = clk_get_rate(wdt->clk); in sp805_wdt_probe()
261 if (!wdt->rate) in sp805_wdt_probe()
262 wdt->rate = rate; in sp805_wdt_probe()
263 if (!wdt->rate) { in sp805_wdt_probe()
264 dev_err(&adev->dev, "no clock-frequency property\n"); in sp805_wdt_probe()
265 return -ENODEV; in sp805_wdt_probe()
268 rst = devm_reset_control_get_optional_exclusive(&adev->dev, NULL); in sp805_wdt_probe()
270 return dev_err_probe(&adev->dev, PTR_ERR(rst), "Can not get reset\n"); in sp805_wdt_probe()
274 wdt->adev = adev; in sp805_wdt_probe()
275 wdt->wdd.info = &wdt_info; in sp805_wdt_probe()
276 wdt->wdd.ops = &wdt_ops; in sp805_wdt_probe()
277 wdt->wdd.parent = &adev->dev; in sp805_wdt_probe()
279 spin_lock_init(&wdt->lock); in sp805_wdt_probe()
280 watchdog_set_nowayout(&wdt->wdd, nowayout); in sp805_wdt_probe()
281 watchdog_set_drvdata(&wdt->wdd, wdt); in sp805_wdt_probe()
282 watchdog_set_restart_priority(&wdt->wdd, 128); in sp805_wdt_probe()
283 watchdog_stop_on_unregister(&wdt->wdd); in sp805_wdt_probe()
286 * If 'timeout-sec' devicetree property is specified, use that. in sp805_wdt_probe()
289 wdt->wdd.timeout = DEFAULT_TIMEOUT; in sp805_wdt_probe()
290 watchdog_init_timeout(&wdt->wdd, 0, &adev->dev); in sp805_wdt_probe()
291 wdt_setload(&wdt->wdd, wdt->wdd.timeout); in sp805_wdt_probe()
294 * If HW is already running, enable/reset the wdt and set the running in sp805_wdt_probe()
297 if (wdt_is_running(&wdt->wdd)) { in sp805_wdt_probe()
298 wdt_enable(&wdt->wdd); in sp805_wdt_probe()
299 set_bit(WDOG_HW_RUNNING, &wdt->wdd.status); in sp805_wdt_probe()
302 watchdog_stop_on_reboot(&wdt->wdd); in sp805_wdt_probe()
303 ret = watchdog_register_device(&wdt->wdd); in sp805_wdt_probe()
308 dev_info(&adev->dev, "registration successful\n"); in sp805_wdt_probe()
312 dev_err(&adev->dev, "Probe Failed!!!\n"); in sp805_wdt_probe()
320 watchdog_unregister_device(&wdt->wdd); in sp805_wdt_remove()
321 watchdog_set_drvdata(&wdt->wdd, NULL); in sp805_wdt_remove()
328 if (watchdog_active(&wdt->wdd)) in sp805_wdt_suspend()
329 return wdt_disable(&wdt->wdd); in sp805_wdt_suspend()
338 if (watchdog_active(&wdt->wdd)) in sp805_wdt_resume()
339 return wdt_enable(&wdt->wdd); in sp805_wdt_resume()
367 .probe = sp805_wdt_probe,