drivers/watchdog/bcm_kona_wdt.c

58 static int secure_register_read(struct bcm_kona_wdt *wdt, uint32_t offset)
71 		val = readl_relaxed(wdt->base + offset);
77 	if (count > wdt->busy_count)
78 		wdt->busy_count = count;
97 	struct bcm_kona_wdt *wdt = s->private;
99 	if (!wdt) {
104 	spin_lock_irqsave(&wdt->lock, flags);
105 	ctl_val = secure_register_read(wdt, SECWDOG_CTRL_REG);
106 	cur_val = secure_register_read(wdt, SECWDOG_COUNT_REG);
107 	spin_unlock_irqrestore(&wdt->lock, flags);
117 		ctl_sec = TICKS_TO_SECS(ctl, wdt);
118 		cur_sec = TICKS_TO_SECS(cur, wdt);
124 			   res, wdt->resolution,
127 			   wdt->busy_count);
138 	struct bcm_kona_wdt *wdt = platform_get_drvdata(pdev);
140 	if (!wdt)
143 	wdt->debugfs = NULL;
147 	debugfs_create_file("info", S_IFREG | S_IRUGO, dir, wdt,
149 	wdt->debugfs = dir;
154 	struct bcm_kona_wdt *wdt = platform_get_drvdata(pdev);
156 	if (wdt)
157 		debugfs_remove_recursive(wdt->debugfs);
167 static int bcm_kona_wdt_ctrl_reg_modify(struct bcm_kona_wdt *wdt,
174 	spin_lock_irqsave(&wdt->lock, flags);
176 	val = secure_register_read(wdt, SECWDOG_CTRL_REG);
182 		writel_relaxed(val, wdt->base + SECWDOG_CTRL_REG);
185 	spin_unlock_irqrestore(&wdt->lock, flags);
190 static int bcm_kona_wdt_set_resolution_reg(struct bcm_kona_wdt *wdt)
192 	if (wdt->resolution > SECWDOG_MAX_RES)
195 	return bcm_kona_wdt_ctrl_reg_modify(wdt, SECWDOG_RES_MASK,
196 					wdt->resolution << SECWDOG_CLKS_SHIFT);
202 	struct bcm_kona_wdt *wdt = watchdog_get_drvdata(wdog);
204 	return bcm_kona_wdt_ctrl_reg_modify(wdt, SECWDOG_COUNT_MASK,
205 					SECS_TO_TICKS(wdog->timeout, wdt) |
218 	struct bcm_kona_wdt *wdt = watchdog_get_drvdata(wdog);
222 	spin_lock_irqsave(&wdt->lock, flags);
223 	val = secure_register_read(wdt, SECWDOG_COUNT_REG);
224 	spin_unlock_irqrestore(&wdt->lock, flags);
229 	return TICKS_TO_SECS(val & SECWDOG_COUNT_MASK, wdt);
240 	struct bcm_kona_wdt *wdt = watchdog_get_drvdata(wdog);
242 	return bcm_kona_wdt_ctrl_reg_modify(wdt, SECWDOG_EN_MASK |
271 	struct bcm_kona_wdt *wdt;
274 	wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL);
275 	if (!wdt)
278 	spin_lock_init(&wdt->lock);
280 	wdt->base = devm_platform_ioremap_resource(pdev, 0);
281 	if (IS_ERR(wdt->base))
282 		return PTR_ERR(wdt->base);
284 	wdt->resolution = SECWDOG_DEFAULT_RESOLUTION;
285 	ret = bcm_kona_wdt_set_resolution_reg(wdt);
291 	platform_set_drvdata(pdev, wdt);
292 	watchdog_set_drvdata(&bcm_kona_wdt_wdd, wdt);
320 	{ .compatible = "brcm,kona-wdt", },