1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (C) 2022 Hewlett-Packard Enterprise Development Company, L.P. */
9 #include <linux/watchdog.h>
33 	val = readb(drvdata->base + GXP_WDT_CTRL_OFS);  in gxp_wdt_enable_reload()
35 	writeb(val, drvdata->base + GXP_WDT_CTRL_OFS);  in gxp_wdt_enable_reload()
42 	writew(SECS_TO_WDOG_TICKS(wdd->timeout), drvdata->base + GXP_WDT_CNT_OFS);  in gxp_wdt_start()
52 	val = readb_relaxed(drvdata->base + GXP_WDT_CTRL_OFS);  in gxp_wdt_stop()
54 	writeb(val, drvdata->base + GXP_WDT_CTRL_OFS);  in gxp_wdt_stop()
64 	wdd->timeout = timeout;  in gxp_wdt_set_timeout()
65 	actual = min(timeout * 100, wdd->max_hw_heartbeat_ms / 10);  in gxp_wdt_set_timeout()
66 	writew(actual, drvdata->base + GXP_WDT_CNT_OFS);  in gxp_wdt_set_timeout()
74 	u32 val = readw(drvdata->base + GXP_WDT_CNT_OFS);  in gxp_wdt_get_timeleft()
92 	writew(1, drvdata->base + GXP_WDT_CNT_OFS);  in gxp_restart()
110 	.identity = "HPE GXP Watchdog timer",
115 	struct device *dev = &pdev->dev;  in gxp_wdt_probe()
122 		return -ENOMEM;  in gxp_wdt_probe()
125 	 * The register area where the timer and watchdog reside is disarranged.  in gxp_wdt_probe()
126 	 * Hence mapping individual register blocks for the timer and watchdog  in gxp_wdt_probe()
128 	 * registers. Based on feedback the watchdog is no longer part of the  in gxp_wdt_probe()
129 	 * device tree file and the timer driver now creates the watchdog as a  in gxp_wdt_probe()
130 	 * child device. During the watchdogs creation, the timer driver passes  in gxp_wdt_probe()
131 	 * the base address to the watchdog over the private interface.  in gxp_wdt_probe()
134 	drvdata->base = (void __iomem *)dev->platform_data;  in gxp_wdt_probe()
136 	drvdata->wdd.info = &gxp_wdt_info;  in gxp_wdt_probe()
137 	drvdata->wdd.ops = &gxp_wdt_ops;  in gxp_wdt_probe()
138 	drvdata->wdd.max_hw_heartbeat_ms = WDT_MAX_TIMEOUT_MS;  in gxp_wdt_probe()
139 	drvdata->wdd.parent = dev;  in gxp_wdt_probe()
140 	drvdata->wdd.timeout = WDT_DEFAULT_TIMEOUT;  in gxp_wdt_probe()
142 	watchdog_set_drvdata(&drvdata->wdd, drvdata);  in gxp_wdt_probe()
143 	watchdog_set_nowayout(&drvdata->wdd, WATCHDOG_NOWAYOUT);  in gxp_wdt_probe()
145 	val = readb(drvdata->base + GXP_WDT_CTRL_OFS);  in gxp_wdt_probe()
148 		set_bit(WDOG_HW_RUNNING, &drvdata->wdd.status);  in gxp_wdt_probe()
150 	watchdog_set_restart_priority(&drvdata->wdd, 128);  in gxp_wdt_probe()
152 	watchdog_stop_on_reboot(&drvdata->wdd);  in gxp_wdt_probe()
153 	err = devm_watchdog_register_device(dev, &drvdata->wdd);  in gxp_wdt_probe()
155 		dev_err(dev, "Failed to register watchdog device");  in gxp_wdt_probe()
159 	dev_info(dev, "HPE GXP watchdog timer");  in gxp_wdt_probe()
167 		.name =	"gxp-wdt",
173 MODULE_AUTHOR("Jean-Marie Verdun <verdun@hpe.com>");
174 MODULE_DESCRIPTION("Driver for GXP watchdog timer");