1 // SPDX-License-Identifier: GPL-2.0+
5  * (C) Copyright 2013 - 2014 Xilinx, Inc.
21 /* Register offsets for the Wdt device */
24 #define XWT_TBR_OFFSET      0x8 /* Timebase Register Offset */
29 #define XWT_CSR0_EWDT1_MASK	BIT(1) /* Enable bit 1 */
31 /* Control/Status Register 0/1 bits  */
54 	ret = clk_enable(xdev->clk);  in xilinx_wdt_start()
56 		dev_err(wdd->parent, "Failed to enable clock\n");  in xilinx_wdt_start()
60 	spin_lock(&xdev->spinlock);  in xilinx_wdt_start()
63 	control_status_reg = ioread32(xdev->base + XWT_TWCSR0_OFFSET);  in xilinx_wdt_start()
67 		  xdev->base + XWT_TWCSR0_OFFSET);  in xilinx_wdt_start()
69 	iowrite32(XWT_CSRX_EWDT2_MASK, xdev->base + XWT_TWCSR1_OFFSET);  in xilinx_wdt_start()
71 	spin_unlock(&xdev->spinlock);  in xilinx_wdt_start()
73 	dev_dbg(wdd->parent, "Watchdog Started!\n");  in xilinx_wdt_start()
83 	spin_lock(&xdev->spinlock);  in xilinx_wdt_stop()
85 	control_status_reg = ioread32(xdev->base + XWT_TWCSR0_OFFSET);  in xilinx_wdt_stop()
88 		  xdev->base + XWT_TWCSR0_OFFSET);  in xilinx_wdt_stop()
90 	iowrite32(0, xdev->base + XWT_TWCSR1_OFFSET);  in xilinx_wdt_stop()
92 	spin_unlock(&xdev->spinlock);  in xilinx_wdt_stop()
94 	clk_disable(xdev->clk);  in xilinx_wdt_stop()
96 	dev_dbg(wdd->parent, "Watchdog Stopped!\n");  in xilinx_wdt_stop()
106 	spin_lock(&xdev->spinlock);  in xilinx_wdt_keepalive()
108 	control_status_reg = ioread32(xdev->base + XWT_TWCSR0_OFFSET);  in xilinx_wdt_keepalive()
110 	iowrite32(control_status_reg, xdev->base + XWT_TWCSR0_OFFSET);  in xilinx_wdt_keepalive()
112 	spin_unlock(&xdev->spinlock);  in xilinx_wdt_keepalive()
120 	.firmware_version =	1,
137 	spin_lock(&xdev->spinlock);  in xwdt_selftest()
139 	timer_value1 = ioread32(xdev->base + XWT_TBR_OFFSET);  in xwdt_selftest()
140 	timer_value2 = ioread32(xdev->base + XWT_TBR_OFFSET);  in xwdt_selftest()
145 		timer_value2 = ioread32(xdev->base + XWT_TBR_OFFSET);  in xwdt_selftest()
148 	spin_unlock(&xdev->spinlock);  in xwdt_selftest()
158 	struct device *dev = &pdev->dev;  in xwdt_probe()
166 		return -ENOMEM;  in xwdt_probe()
168 	xilinx_wdt_wdd = &xdev->xilinx_wdt_wdd;  in xwdt_probe()
169 	xilinx_wdt_wdd->info = &xilinx_wdt_ident;  in xwdt_probe()
170 	xilinx_wdt_wdd->ops = &xilinx_wdt_ops;  in xwdt_probe()
171 	xilinx_wdt_wdd->parent = dev;  in xwdt_probe()
173 	xdev->base = devm_platform_ioremap_resource(pdev, 0);  in xwdt_probe()
174 	if (IS_ERR(xdev->base))  in xwdt_probe()
175 		return PTR_ERR(xdev->base);  in xwdt_probe()
177 	rc = of_property_read_u32(dev->of_node, "xlnx,wdt-interval",  in xwdt_probe()
178 				  &xdev->wdt_interval);  in xwdt_probe()
180 		dev_warn(dev, "Parameter \"xlnx,wdt-interval\" not found\n");  in xwdt_probe()
182 	rc = of_property_read_u32(dev->of_node, "xlnx,wdt-enable-once",  in xwdt_probe()
186 			 "Parameter \"xlnx,wdt-enable-once\" not found\n");  in xwdt_probe()
190 	xdev->clk = devm_clk_get_prepared(dev, NULL);  in xwdt_probe()
191 	if (IS_ERR(xdev->clk)) {  in xwdt_probe()
192 		if (PTR_ERR(xdev->clk) != -ENOENT)  in xwdt_probe()
193 			return PTR_ERR(xdev->clk);  in xwdt_probe()
199 		xdev->clk = NULL;  in xwdt_probe()
201 		rc = of_property_read_u32(dev->of_node, "clock-frequency",  in xwdt_probe()
207 		pfreq = clk_get_rate(xdev->clk);  in xwdt_probe()
211 	 * Twice of the 2^wdt_interval / freq  because the first wdt overflow is  in xwdt_probe()
212 	 * ignored (interrupt), reset is only generated at second wdt overflow  in xwdt_probe()
214 	if (pfreq && xdev->wdt_interval)  in xwdt_probe()
215 		xilinx_wdt_wdd->timeout = 2 * ((1 << xdev->wdt_interval) /  in xwdt_probe()
218 	spin_lock_init(&xdev->spinlock);  in xwdt_probe()
221 	rc = clk_enable(xdev->clk);  in xwdt_probe()
230 		clk_disable(xdev->clk);  in xwdt_probe()
234 	clk_disable(xdev->clk);  in xwdt_probe()
241 		 xilinx_wdt_wdd->timeout);  in xwdt_probe()
249  * xwdt_suspend - Suspend the device.
258 	if (watchdog_active(&xdev->xilinx_wdt_wdd))  in xwdt_suspend()
259 		xilinx_wdt_stop(&xdev->xilinx_wdt_wdd);  in xwdt_suspend()
265  * xwdt_resume - Resume the device.
275 	if (watchdog_active(&xdev->xilinx_wdt_wdd))  in xwdt_resume()
276 		ret = xilinx_wdt_start(&xdev->xilinx_wdt_wdd);  in xwdt_resume()
285 	{ .compatible = "xlnx,xps-timebase-wdt-1.00.a", },
286 	{ .compatible = "xlnx,xps-timebase-wdt-1.01.a", },