1 // SPDX-License-Identifier: GPL-2.0
32 #define SECS_TO_TICKS(x, w)		((x) << (w)->resolution)
33 #define TICKS_TO_SECS(x, w)		((x) >> (w)->resolution)
41 	 * the values 0-15, meaning one tick can be 1s to 30.52us. Our default
65 	 * updated in hardware. Once the WD timer is updated in hardware, it  in secure_register_read()
71 		val = readl_relaxed(wdt->base + offset);  in secure_register_read()
77 	if (count > wdt->busy_count)  in secure_register_read()
78 		wdt->busy_count = count;  in secure_register_read()
83 		return -ETIMEDOUT;  in secure_register_read()
97 	struct bcm_kona_wdt *wdt = s->private;  in bcm_kona_show()
104 	spin_lock_irqsave(&wdt->lock, flags);  in bcm_kona_show()
107 	spin_unlock_irqrestore(&wdt->lock, flags);  in bcm_kona_show()
124 			   res, wdt->resolution,  in bcm_kona_show()
127 			   wdt->busy_count);  in bcm_kona_show()
143 	wdt->debugfs = NULL;  in bcm_kona_wdt_debug_init()
149 	wdt->debugfs = dir;  in bcm_kona_wdt_debug_init()
157 		debugfs_remove_recursive(wdt->debugfs);  in bcm_kona_wdt_debug_exit()
174 	spin_lock_irqsave(&wdt->lock, flags);  in bcm_kona_wdt_ctrl_reg_modify()
182 		writel_relaxed(val, wdt->base + SECWDOG_CTRL_REG);  in bcm_kona_wdt_ctrl_reg_modify()
185 	spin_unlock_irqrestore(&wdt->lock, flags);  in bcm_kona_wdt_ctrl_reg_modify()
192 	if (wdt->resolution > SECWDOG_MAX_RES)  in bcm_kona_wdt_set_resolution_reg()
193 		return -EINVAL;  in bcm_kona_wdt_set_resolution_reg()
196 					wdt->resolution << SECWDOG_CLKS_SHIFT);  in bcm_kona_wdt_set_resolution_reg()
205 					SECS_TO_TICKS(wdog->timeout, wdt) |  in bcm_kona_wdt_set_timeout_reg()
212 	wdog->timeout = t;  in bcm_kona_wdt_set_timeout()
222 	spin_lock_irqsave(&wdt->lock, flags);  in bcm_kona_wdt_get_timeleft()
224 	spin_unlock_irqrestore(&wdt->lock, flags);  in bcm_kona_wdt_get_timeleft()
257 	.identity =	"Broadcom Kona Watchdog Timer",
270 	struct device *dev = &pdev->dev;  in bcm_kona_wdt_probe()
276 		return -ENOMEM;  in bcm_kona_wdt_probe()
278 	spin_lock_init(&wdt->lock);  in bcm_kona_wdt_probe()
280 	wdt->base = devm_platform_ioremap_resource(pdev, 0);  in bcm_kona_wdt_probe()
281 	if (IS_ERR(wdt->base))  in bcm_kona_wdt_probe()
282 		return PTR_ERR(wdt->base);  in bcm_kona_wdt_probe()
284 	wdt->resolution = SECWDOG_DEFAULT_RESOLUTION;  in bcm_kona_wdt_probe()
308 	dev_dbg(dev, "Broadcom Kona Watchdog Timer");  in bcm_kona_wdt_probe()
316 	dev_dbg(&pdev->dev, "Watchdog driver disabled");  in bcm_kona_wdt_remove()
320 	{ .compatible = "brcm,kona-wdt", },
338 MODULE_DESCRIPTION("Broadcom Kona Watchdog Driver");