drivers/watchdog/aspeed_wdt.c

57 	{ .compatible = "aspeed,ast2400-wdt", .data = &ast2400_config },
58 	{ .compatible = "aspeed,ast2500-wdt", .data = &ast2500_config },
59 	{ .compatible = "aspeed,ast2600-wdt", .data = &ast2600_config },
129 static void aspeed_wdt_enable(struct aspeed_wdt *wdt, int count)
131 	wdt->ctrl |= WDT_CTRL_ENABLE;
133 	writel(0, wdt->base + WDT_CTRL);
134 	writel(count, wdt->base + WDT_RELOAD_VALUE);
135 	writel(WDT_RESTART_MAGIC, wdt->base + WDT_RESTART);
136 	writel(wdt->ctrl, wdt->base + WDT_CTRL);
141 	struct aspeed_wdt *wdt = to_aspeed_wdt(wdd);
143 	aspeed_wdt_enable(wdt, wdd->timeout * WDT_RATE_1MHZ);
150 	struct aspeed_wdt *wdt = to_aspeed_wdt(wdd);
152 	wdt->ctrl &= ~WDT_CTRL_ENABLE;
153 	writel(wdt->ctrl, wdt->base + WDT_CTRL);
160 	struct aspeed_wdt *wdt = to_aspeed_wdt(wdd);
162 	writel(WDT_RESTART_MAGIC, wdt->base + WDT_RESTART);
170 	struct aspeed_wdt *wdt = to_aspeed_wdt(wdd);
177 	writel(actual * WDT_RATE_1MHZ, wdt->base + WDT_RELOAD_VALUE);
178 	writel(WDT_RESTART_MAGIC, wdt->base + WDT_RESTART);
186 	struct aspeed_wdt *wdt = to_aspeed_wdt(wdd);
188 	u32 s = wdt->cfg->irq_shift;
189 	u32 m = wdt->cfg->irq_mask;
192 	wdt->ctrl &= ~m;
194 		wdt->ctrl |= ((actual << s) & m) | WDT_CTRL_WDT_INTR;
196 		wdt->ctrl &= ~WDT_CTRL_WDT_INTR;
198 	writel(wdt->ctrl, wdt->base + WDT_CTRL);
206 	struct aspeed_wdt *wdt = to_aspeed_wdt(wdd);
208 	wdt->ctrl &= ~WDT_CTRL_BOOT_SECONDARY;
209 	aspeed_wdt_enable(wdt, 128 * WDT_RATE_1MHZ / 1000);
220 	struct aspeed_wdt *wdt = dev_get_drvdata(dev);
221 	u32 status = readl(wdt->base + WDT_TIMEOUT_STATUS);
231 	struct aspeed_wdt *wdt = dev_get_drvdata(dev);
239 		       wdt->base + WDT_CLEAR_TIMEOUT_STATUS);
298 	struct aspeed_wdt *wdt = to_aspeed_wdt(wdd);
299 	u32 status = readl(wdt->base + WDT_TIMEOUT_STATUS);
311 	struct aspeed_wdt *wdt;
318 	wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL);
319 	if (!wdt)
327 	wdt->cfg = ofdid->data;
329 	wdt->base = devm_platform_ioremap_resource(pdev, 0);
330 	if (IS_ERR(wdt->base))
331 		return PTR_ERR(wdt->base);
333 	wdt->wdd.info = &aspeed_wdt_info;
335 	if (wdt->cfg->irq_mask) {
341 					       wdt);
345 			wdt->wdd.info = &aspeed_wdt_pretimeout_info;
349 	wdt->wdd.ops = &aspeed_wdt_ops;
350 	wdt->wdd.max_hw_heartbeat_ms = WDT_MAX_TIMEOUT_MS;
351 	wdt->wdd.parent = dev;
353 	wdt->wdd.timeout = WDT_DEFAULT_TIMEOUT;
354 	watchdog_init_timeout(&wdt->wdd, 0, dev);
356 	watchdog_set_nowayout(&wdt->wdd, nowayout);
360 	 *  - ast2400 wdt can run at PCLK, or 1MHz
366 	if (of_device_is_compatible(np, "aspeed,ast2400-wdt"))
367 		wdt->ctrl = WDT_CTRL_1MHZ_CLK;
375 		wdt->ctrl |= WDT_CTRL_RESET_MODE_SOC | WDT_CTRL_RESET_SYSTEM;
378 			wdt->ctrl |= WDT_CTRL_RESET_MODE_ARM_CPU |
381 			wdt->ctrl |= WDT_CTRL_RESET_MODE_SOC |
384 			wdt->ctrl |= WDT_CTRL_RESET_MODE_FULL_CHIP |
390 		wdt->ctrl |= WDT_CTRL_WDT_EXT;
392 		wdt->ctrl |= WDT_CTRL_BOOT_SECONDARY;
394 	if (readl(wdt->base + WDT_CTRL) & WDT_CTRL_ENABLE)  {
397 		 * write wdt->ctrl to WDT_CTRL to ensure the watchdog's
401 		aspeed_wdt_start(&wdt->wdd);
402 		set_bit(WDOG_HW_RUNNING, &wdt->wdd.status);
405 	if ((of_device_is_compatible(np, "aspeed,ast2500-wdt")) ||
406 		(of_device_is_compatible(np, "aspeed,ast2600-wdt"))) {
408 		size_t nrstmask = of_device_is_compatible(np, "aspeed,ast2600-wdt") ? 2 : 1;
409 		u32 reg = readl(wdt->base + WDT_RESET_WIDTH);
411 		reg &= wdt->cfg->ext_pulse_width_mask;
417 		writel(reg, wdt->base + WDT_RESET_WIDTH);
419 		reg &= wdt->cfg->ext_pulse_width_mask;
425 		writel(reg, wdt->base + WDT_RESET_WIDTH);
429 			writel(reset_mask[0], wdt->base + WDT_RESET_MASK1);
431 				writel(reset_mask[1], wdt->base + WDT_RESET_MASK2);
436 		u32 max_duration = wdt->cfg->ext_pulse_width_mask + 1;
458 		writel(duration - 1, wdt->base + WDT_RESET_WIDTH);
461 	status = readl(wdt->base + WDT_TIMEOUT_STATUS);
463 		wdt->wdd.bootstatus = WDIOF_CARDRESET;
465 		if (of_device_is_compatible(np, "aspeed,ast2400-wdt") ||
466 		    of_device_is_compatible(np, "aspeed,ast2500-wdt"))
467 			wdt->wdd.groups = bswitch_groups;
470 	dev_set_drvdata(dev, wdt);
472 	return devm_watchdog_register_device(dev, &wdt->wdd);