1 // SPDX-License-Identifier: GPL-2.0-or-later
33 #define DRV_NAME		"sunxi-wdt"
60  * wdt_timeout_map maps the watchdog timer interval value in seconds to
86 	void __iomem *wdt_base = sunxi_wdt->wdt_base;  in sunxi_wdt_restart()
87 	const struct sunxi_wdt_reg *regs = sunxi_wdt->wdt_regs;  in sunxi_wdt_restart()
91 	val = readl(wdt_base + regs->wdt_cfg);  in sunxi_wdt_restart()
92 	val &= ~(regs->wdt_reset_mask);  in sunxi_wdt_restart()
93 	val |= regs->wdt_reset_val;  in sunxi_wdt_restart()
94 	val |= regs->wdt_key_val;  in sunxi_wdt_restart()
95 	writel(val, wdt_base + regs->wdt_cfg);  in sunxi_wdt_restart()
98 	val = readl(wdt_base + regs->wdt_mode);  in sunxi_wdt_restart()
99 	val &= ~(WDT_TIMEOUT_MASK << regs->wdt_timeout_shift);  in sunxi_wdt_restart()
101 	val |= regs->wdt_key_val;  in sunxi_wdt_restart()
102 	writel(val, wdt_base + regs->wdt_mode);  in sunxi_wdt_restart()
105 	 * Restart the watchdog. The default (and lowest) interval  in sunxi_wdt_restart()
108 	writel(WDT_CTRL_RELOAD, wdt_base + regs->wdt_ctrl);  in sunxi_wdt_restart()
112 		val = readl(wdt_base + regs->wdt_mode);  in sunxi_wdt_restart()
114 		val |= regs->wdt_key_val;  in sunxi_wdt_restart()
115 		writel(val, wdt_base + regs->wdt_mode);  in sunxi_wdt_restart()
123 	void __iomem *wdt_base = sunxi_wdt->wdt_base;  in sunxi_wdt_ping()
124 	const struct sunxi_wdt_reg *regs = sunxi_wdt->wdt_regs;  in sunxi_wdt_ping()
126 	writel(WDT_CTRL_RELOAD, wdt_base + regs->wdt_ctrl);  in sunxi_wdt_ping()
135 	void __iomem *wdt_base = sunxi_wdt->wdt_base;  in sunxi_wdt_set_timeout()
136 	const struct sunxi_wdt_reg *regs = sunxi_wdt->wdt_regs;  in sunxi_wdt_set_timeout()
142 	sunxi_wdt->wdt_dev.timeout = timeout;  in sunxi_wdt_set_timeout()
144 	reg = readl(wdt_base + regs->wdt_mode);  in sunxi_wdt_set_timeout()
145 	reg &= ~(WDT_TIMEOUT_MASK << regs->wdt_timeout_shift);  in sunxi_wdt_set_timeout()
146 	reg |= wdt_timeout_map[timeout] << regs->wdt_timeout_shift;  in sunxi_wdt_set_timeout()
147 	reg |= regs->wdt_key_val;  in sunxi_wdt_set_timeout()
148 	writel(reg, wdt_base + regs->wdt_mode);  in sunxi_wdt_set_timeout()
158 	void __iomem *wdt_base = sunxi_wdt->wdt_base;  in sunxi_wdt_stop()
159 	const struct sunxi_wdt_reg *regs = sunxi_wdt->wdt_regs;  in sunxi_wdt_stop()
161 	writel(regs->wdt_key_val, wdt_base + regs->wdt_mode);  in sunxi_wdt_stop()
170 	void __iomem *wdt_base = sunxi_wdt->wdt_base;  in sunxi_wdt_start()
171 	const struct sunxi_wdt_reg *regs = sunxi_wdt->wdt_regs;  in sunxi_wdt_start()
174 	ret = sunxi_wdt_set_timeout(&sunxi_wdt->wdt_dev,  in sunxi_wdt_start()
175 			sunxi_wdt->wdt_dev.timeout);  in sunxi_wdt_start()
180 	reg = readl(wdt_base + regs->wdt_cfg);  in sunxi_wdt_start()
181 	reg &= ~(regs->wdt_reset_mask);  in sunxi_wdt_start()
182 	reg |= regs->wdt_reset_val;  in sunxi_wdt_start()
183 	reg |= regs->wdt_key_val;  in sunxi_wdt_start()
184 	writel(reg, wdt_base + regs->wdt_cfg);  in sunxi_wdt_start()
187 	reg = readl(wdt_base + regs->wdt_mode);  in sunxi_wdt_start()
189 	reg |= regs->wdt_key_val;  in sunxi_wdt_start()
190 	writel(reg, wdt_base + regs->wdt_mode);  in sunxi_wdt_start()
240 	{ .compatible = "allwinner,sun4i-a10-wdt", .data = &sun4i_wdt_reg },
241 	{ .compatible = "allwinner,sun6i-a31-wdt", .data = &sun6i_wdt_reg },
242 	{ .compatible = "allwinner,sun20i-d1-wdt", .data = &sun20i_wdt_reg },
249 	struct device *dev = &pdev->dev;  in sunxi_wdt_probe()
255 		return -ENOMEM;  in sunxi_wdt_probe()
257 	sunxi_wdt->wdt_regs = of_device_get_match_data(dev);  in sunxi_wdt_probe()
258 	if (!sunxi_wdt->wdt_regs)  in sunxi_wdt_probe()
259 		return -ENODEV;  in sunxi_wdt_probe()
261 	sunxi_wdt->wdt_base = devm_platform_ioremap_resource(pdev, 0);  in sunxi_wdt_probe()
262 	if (IS_ERR(sunxi_wdt->wdt_base))  in sunxi_wdt_probe()
263 		return PTR_ERR(sunxi_wdt->wdt_base);  in sunxi_wdt_probe()
265 	sunxi_wdt->wdt_dev.info = &sunxi_wdt_info;  in sunxi_wdt_probe()
266 	sunxi_wdt->wdt_dev.ops = &sunxi_wdt_ops;  in sunxi_wdt_probe()
267 	sunxi_wdt->wdt_dev.timeout = WDT_MAX_TIMEOUT;  in sunxi_wdt_probe()
268 	sunxi_wdt->wdt_dev.max_timeout = WDT_MAX_TIMEOUT;  in sunxi_wdt_probe()
269 	sunxi_wdt->wdt_dev.min_timeout = WDT_MIN_TIMEOUT;  in sunxi_wdt_probe()
270 	sunxi_wdt->wdt_dev.parent = dev;  in sunxi_wdt_probe()
272 	watchdog_init_timeout(&sunxi_wdt->wdt_dev, timeout, dev);  in sunxi_wdt_probe()
273 	watchdog_set_nowayout(&sunxi_wdt->wdt_dev, nowayout);  in sunxi_wdt_probe()
274 	watchdog_set_restart_priority(&sunxi_wdt->wdt_dev, 128);  in sunxi_wdt_probe()
276 	watchdog_set_drvdata(&sunxi_wdt->wdt_dev, sunxi_wdt);  in sunxi_wdt_probe()
278 	sunxi_wdt_stop(&sunxi_wdt->wdt_dev);  in sunxi_wdt_probe()
280 	watchdog_stop_on_reboot(&sunxi_wdt->wdt_dev);  in sunxi_wdt_probe()
281 	err = devm_watchdog_register_device(dev, &sunxi_wdt->wdt_dev);  in sunxi_wdt_probe()
286 		 sunxi_wdt->wdt_dev.timeout, nowayout);  in sunxi_wdt_probe()