1 // SPDX-License-Identifier: GPL-2.0
7  * Copyright (C) 2006-2013 Texas Instruments.
24 #define MODULE_NAME "DAVINCI-WDT: "
59  * struct to hold data for each WDT device
60  * @base - base io address of WD device
61  * @clk - source clock of WDT
62  * @wdd - hold watchdog device as is in WDT core
77 	wdt_freq = clk_get_rate(davinci_wdt->clk);  in davinci_wdt_start()
80 	iowrite32(0, davinci_wdt->base + TCR);  in davinci_wdt_start()
81 	/* reset timer, set mode to 64-bit watchdog, and unreset */  in davinci_wdt_start()
82 	iowrite32(0, davinci_wdt->base + TGCR);  in davinci_wdt_start()
84 	iowrite32(tgcr, davinci_wdt->base + TGCR);  in davinci_wdt_start()
86 	iowrite32(0, davinci_wdt->base + TIM12);  in davinci_wdt_start()
87 	iowrite32(0, davinci_wdt->base + TIM34);  in davinci_wdt_start()
89 	timer_margin = (((u64)wdd->timeout * wdt_freq) & 0xffffffff);  in davinci_wdt_start()
90 	iowrite32(timer_margin, davinci_wdt->base + PRD12);  in davinci_wdt_start()
91 	timer_margin = (((u64)wdd->timeout * wdt_freq) >> 32);  in davinci_wdt_start()
92 	iowrite32(timer_margin, davinci_wdt->base + PRD34);  in davinci_wdt_start()
93 	/* enable run continuously */  in davinci_wdt_start()
94 	iowrite32(ENAMODE12_PERIODIC, davinci_wdt->base + TCR);  in davinci_wdt_start()
95 	/* Once the WDT is in pre-active state write to  in davinci_wdt_start()
99 	/* put watchdog in pre-active state */  in davinci_wdt_start()
100 	iowrite32(WDKEY_SEQ0 | WDEN, davinci_wdt->base + WDTCR);  in davinci_wdt_start()
102 	iowrite32(WDKEY_SEQ1 | WDEN, davinci_wdt->base + WDTCR);  in davinci_wdt_start()
111 	iowrite32(WDKEY_SEQ0, davinci_wdt->base + WDTCR);  in davinci_wdt_ping()
113 	iowrite32(WDKEY_SEQ1, davinci_wdt->base + WDTCR);  in davinci_wdt_ping()
125 	val = ioread32(davinci_wdt->base + WDTCR);  in davinci_wdt_get_timeleft()
129 	freq = clk_get_rate(davinci_wdt->clk);  in davinci_wdt_get_timeleft()
134 	timer_counter = ioread32(davinci_wdt->base + TIM12);  in davinci_wdt_get_timeleft()
135 	timer_counter |= ((u64)ioread32(davinci_wdt->base + TIM34) << 32);  in davinci_wdt_get_timeleft()
139 	return wdd->timeout - timer_counter;  in davinci_wdt_get_timeleft()
149 	iowrite32(0, davinci_wdt->base + TCR);  in davinci_wdt_restart()
151 	/* reset timer, set mode to 64-bit watchdog, and unreset */  in davinci_wdt_restart()
153 	iowrite32(tgcr, davinci_wdt->base + TGCR);  in davinci_wdt_restart()
155 	iowrite32(tgcr, davinci_wdt->base + TGCR);  in davinci_wdt_restart()
158 	iowrite32(0, davinci_wdt->base + TIM12);  in davinci_wdt_restart()
159 	iowrite32(0, davinci_wdt->base + TIM34);  in davinci_wdt_restart()
160 	iowrite32(0, davinci_wdt->base + PRD12);  in davinci_wdt_restart()
161 	iowrite32(0, davinci_wdt->base + PRD34);  in davinci_wdt_restart()
163 	/* put watchdog in pre-active state */  in davinci_wdt_restart()
165 	iowrite32(wdtcr, davinci_wdt->base + WDTCR);  in davinci_wdt_restart()
169 	iowrite32(wdtcr, davinci_wdt->base + WDTCR);  in davinci_wdt_restart()
173 	iowrite32(wdtcr, davinci_wdt->base + WDTCR);  in davinci_wdt_restart()
194 	struct device *dev = &pdev->dev;  in davinci_wdt_probe()
200 		return -ENOMEM;  in davinci_wdt_probe()
202 	davinci_wdt->clk = devm_clk_get_enabled(dev, NULL);  in davinci_wdt_probe()
203 	if (IS_ERR(davinci_wdt->clk))  in davinci_wdt_probe()
204 		return dev_err_probe(dev, PTR_ERR(davinci_wdt->clk),  in davinci_wdt_probe()
209 	wdd			= &davinci_wdt->wdd;  in davinci_wdt_probe()
210 	wdd->info		= &davinci_wdt_info;  in davinci_wdt_probe()
211 	wdd->ops		= &davinci_wdt_ops;  in davinci_wdt_probe()
212 	wdd->min_timeout	= 1;  in davinci_wdt_probe()
213 	wdd->max_timeout	= MAX_HEARTBEAT;  in davinci_wdt_probe()
214 	wdd->timeout		= DEFAULT_HEARTBEAT;  in davinci_wdt_probe()
215 	wdd->parent		= dev;  in davinci_wdt_probe()
219 	dev_info(dev, "heartbeat %d sec\n", wdd->timeout);  in davinci_wdt_probe()
225 	davinci_wdt->base = devm_platform_ioremap_resource(pdev, 0);  in davinci_wdt_probe()
226 	if (IS_ERR(davinci_wdt->base))  in davinci_wdt_probe()
227 		return PTR_ERR(davinci_wdt->base);  in davinci_wdt_probe()
233 	{ .compatible = "ti,davinci-wdt", },
240 		.name = "davinci-wdt",
258 MODULE_ALIAS("platform:davinci-wdt");