1 // SPDX-License-Identifier: GPL-2.0
5  * Copyright (C) 2022 - 2024, Advanced Micro Devices, Inc.
50 		 "Watchdog time in seconds. (default="
57  * struct xwwdt_device - Watchdog device structure
79 	struct watchdog_device *xilinx_wwdt_wdd = &xdev->xilinx_wwdt_wdd;  in xilinx_wwdt_start()
82 	spin_lock(&xdev->spinlock);  in xilinx_wwdt_start()
84 	iowrite32(XWWDT_MWR_MASK, xdev->base + XWWDT_MWR_OFFSET);  in xilinx_wwdt_start()
85 	iowrite32(~(u32)XWWDT_ESR_WEN_MASK, xdev->base + XWWDT_ESR_OFFSET);  in xilinx_wwdt_start()
86 	iowrite32((u32)xdev->closed_timeout, xdev->base + XWWDT_FWR_OFFSET);  in xilinx_wwdt_start()
87 	iowrite32((u32)xdev->open_timeout, xdev->base + XWWDT_SWR_OFFSET);  in xilinx_wwdt_start()
90 	control_status_reg = ioread32(xdev->base + XWWDT_ESR_OFFSET);  in xilinx_wwdt_start()
92 	iowrite32(control_status_reg, xdev->base + XWWDT_ESR_OFFSET);  in xilinx_wwdt_start()
94 	spin_unlock(&xdev->spinlock);  in xilinx_wwdt_start()
96 	dev_dbg(xilinx_wwdt_wdd->parent, "Watchdog Started!\n");  in xilinx_wwdt_start()
106 	spin_lock(&xdev->spinlock);  in xilinx_wwdt_keepalive()
109 	iowrite32(XWWDT_MWR_MASK, xdev->base + XWWDT_MWR_OFFSET);  in xilinx_wwdt_keepalive()
112 	control_status_reg = ioread32(xdev->base + XWWDT_ESR_OFFSET);  in xilinx_wwdt_keepalive()
114 	iowrite32(control_status_reg, xdev->base + XWWDT_ESR_OFFSET);  in xilinx_wwdt_keepalive()
116 	spin_unlock(&xdev->spinlock);  in xilinx_wwdt_keepalive()
137 	struct device *dev = &pdev->dev;  in xwwdt_probe()
149 		return -ENOMEM;  in xwwdt_probe()
151 	xilinx_wwdt_wdd = &xdev->xilinx_wwdt_wdd;  in xwwdt_probe()
152 	xilinx_wwdt_wdd->info = &xilinx_wwdt_ident;  in xwwdt_probe()
153 	xilinx_wwdt_wdd->ops = &xilinx_wwdt_ops;  in xwwdt_probe()
154 	xilinx_wwdt_wdd->parent = dev;  in xwwdt_probe()
156 	xdev->base = devm_platform_ioremap_resource(pdev, 0);  in xwwdt_probe()
157 	if (IS_ERR(xdev->base))  in xwwdt_probe()
158 		return PTR_ERR(xdev->base);  in xwwdt_probe()
164 	xdev->freq = clk_get_rate(clk);  in xwwdt_probe()
165 	if (xdev->freq < 1000000)  in xwwdt_probe()
166 		return -EINVAL;  in xwwdt_probe()
168 	xilinx_wwdt_wdd->min_timeout = XWWDT_MIN_TIMEOUT;  in xwwdt_probe()
169 	xilinx_wwdt_wdd->timeout = XWWDT_DEFAULT_TIMEOUT;  in xwwdt_probe()
170 	xilinx_wwdt_wdd->max_hw_heartbeat_ms =  in xwwdt_probe()
171 		div64_u64(XWWDT_MAX_COUNT_WINDOW_COMBINED, xdev->freq) * 1000;  in xwwdt_probe()
174 		xdev->close_percent = XWWDT_CLOSE_WINDOW_PERCENT;  in xwwdt_probe()
176 		xdev->close_percent = closed_window_percent;  in xwwdt_probe()
178 	watchdog_init_timeout(xilinx_wwdt_wdd, wwdt_timeout, &pdev->dev);  in xwwdt_probe()
180 	/* Calculate ticks for 1 milli-second */  in xwwdt_probe()
181 	ms_count = div_u64(xdev->freq, 1000);  in xwwdt_probe()
182 	timeout_ms = xilinx_wwdt_wdd->timeout * 1000;  in xwwdt_probe()
185 	if (timeout_ms > xilinx_wwdt_wdd->max_hw_heartbeat_ms) {  in xwwdt_probe()
191 		xdev->closed_timeout = 0;  in xwwdt_probe()
192 		xdev->open_timeout = XWWDT_MAX_COUNT_WINDOW;  in xwwdt_probe()
193 		xilinx_wwdt_wdd->min_hw_heartbeat_ms = 0;  in xwwdt_probe()
194 		xilinx_wwdt_wdd->max_hw_heartbeat_ms = xilinx_wwdt_wdd->max_hw_heartbeat_ms / 2;  in xwwdt_probe()
196 		xdev->closed_timeout  = div64_u64(timeout_count * xdev->close_percent, 100);  in xwwdt_probe()
197 		xilinx_wwdt_wdd->min_hw_heartbeat_ms =  in xwwdt_probe()
198 			div64_u64(timeout_ms * xdev->close_percent, 100);  in xwwdt_probe()
200 		if (timeout_ms > xilinx_wwdt_wdd->max_hw_heartbeat_ms / 2) {  in xwwdt_probe()
201 			max_per_window_ms = xilinx_wwdt_wdd->max_hw_heartbeat_ms / 2;  in xwwdt_probe()
202 			min_per_window_ms = timeout_ms - max_per_window_ms;  in xwwdt_probe()
204 			if (xilinx_wwdt_wdd->min_hw_heartbeat_ms > max_per_window_ms) {  in xwwdt_probe()
205 				dev_info(xilinx_wwdt_wdd->parent,  in xwwdt_probe()
207 					xdev->close_percent);  in xwwdt_probe()
208 				xdev->closed_timeout = max_per_window_ms * ms_count;  in xwwdt_probe()
209 				xilinx_wwdt_wdd->min_hw_heartbeat_ms = max_per_window_ms;  in xwwdt_probe()
210 			} else if (xilinx_wwdt_wdd->min_hw_heartbeat_ms < min_per_window_ms) {  in xwwdt_probe()
211 				dev_info(xilinx_wwdt_wdd->parent,  in xwwdt_probe()
213 					xdev->close_percent);  in xwwdt_probe()
214 				xdev->closed_timeout = min_per_window_ms * ms_count;  in xwwdt_probe()
215 				xilinx_wwdt_wdd->min_hw_heartbeat_ms = min_per_window_ms;  in xwwdt_probe()
218 		xdev->open_timeout = timeout_count - xdev->closed_timeout;  in xwwdt_probe()
221 	spin_lock_init(&xdev->spinlock);  in xwwdt_probe()
230 		 xilinx_wwdt_wdd->timeout);  in xwwdt_probe()
236 	{ .compatible = "xlnx,versal-wwdt", },