1 // SPDX-License-Identifier: GPL-2.0+
5  * Copyright (C) 2014 STMicroelectronics -- All Rights Reserved
22 #include <dt-bindings/mfd/st-lpc.h>
57 		.compatible = "st,stih407-lpc",
64 static void st_wdog_setup(struct st_wdog *st_wdog, bool enable)  in st_wdog_setup()  argument
66 	/* Type of watchdog reset - 0: Cold 1: Warm */  in st_wdog_setup()
67 	if (st_wdog->syscfg->reset_type_reg)  in st_wdog_setup()
68 		regmap_update_bits(st_wdog->regmap,  in st_wdog_setup()
69 				   st_wdog->syscfg->reset_type_reg,  in st_wdog_setup()
70 				   st_wdog->syscfg->reset_type_mask,  in st_wdog_setup()
71 				   st_wdog->warm_reset);  in st_wdog_setup()
74 	regmap_update_bits(st_wdog->regmap,  in st_wdog_setup()
75 			   st_wdog->syscfg->enable_reg,  in st_wdog_setup()
76 			   st_wdog->syscfg->enable_mask,  in st_wdog_setup()
77 			   enable ? 0 : st_wdog->syscfg->enable_mask);  in st_wdog_setup()
80 static void st_wdog_load_timer(struct st_wdog *st_wdog, unsigned int timeout)  in st_wdog_load_timer()  argument
82 	unsigned long clkrate = st_wdog->clkrate;  in st_wdog_load_timer()
84 	writel_relaxed(timeout * clkrate, st_wdog->base + LPC_LPA_LSB_OFF);  in st_wdog_load_timer()
85 	writel_relaxed(1, st_wdog->base + LPC_LPA_START_OFF);  in st_wdog_load_timer()
92 	writel_relaxed(1, st_wdog->base + LPC_WDT_OFF);  in st_wdog_start()
101 	writel_relaxed(0, st_wdog->base + LPC_WDT_OFF);  in st_wdog_stop()
107 			       unsigned int timeout)  in st_wdog_set_timeout()  argument
111 	wdd->timeout = timeout;  in st_wdog_set_timeout()
112 	st_wdog_load_timer(st_wdog, timeout);  in st_wdog_set_timeout()
121 	st_wdog_load_timer(st_wdog, wdd->timeout);  in st_wdog_keepalive()
151 	struct device *dev = &pdev->dev;  in st_wdog_probe()
152 	struct device_node *np = dev->of_node;  in st_wdog_probe()
160 	ret = of_property_read_u32(np, "st,lpc-mode", &mode);  in st_wdog_probe()
163 		return -EINVAL;  in st_wdog_probe()
168 		return -ENODEV;  in st_wdog_probe()
172 		return -ENOMEM;  in st_wdog_probe()
174 	st_wdog->syscfg	= (struct st_wdog_syscfg *)device_get_match_data(dev);  in st_wdog_probe()
192 	st_wdog->dev		= dev;  in st_wdog_probe()
193 	st_wdog->base		= base;  in st_wdog_probe()
194 	st_wdog->clk		= clk;  in st_wdog_probe()
195 	st_wdog->regmap		= regmap;  in st_wdog_probe()
196 	st_wdog->warm_reset	= of_property_read_bool(np, "st,warm_reset");  in st_wdog_probe()
197 	st_wdog->clkrate	= clk_get_rate(st_wdog->clk);  in st_wdog_probe()
199 	if (!st_wdog->clkrate) {  in st_wdog_probe()
201 		return -EINVAL;  in st_wdog_probe()
203 	st_wdog_dev.max_timeout = 0xFFFFFFFF / st_wdog->clkrate;  in st_wdog_probe()
208 		dev_err(dev, "Unable to enable clock\n");  in st_wdog_probe()
218 	/* Init Watchdog timeout with value in DT */  in st_wdog_probe()
230 		 st_wdog->warm_reset ? "warm" : "cold");  in st_wdog_probe()
251 	clk_disable(st_wdog->clk);  in st_wdog_suspend()
261 	ret = clk_enable(st_wdog->clk);  in st_wdog_resume()
263 		dev_err(dev, "Unable to re-enable clock\n");  in st_wdog_resume()
265 		clk_unprepare(st_wdog->clk);  in st_wdog_resume()
272 		st_wdog_load_timer(st_wdog, st_wdog_dev.timeout);  in st_wdog_resume()
284 		.name = "st-lpc-wdt",