1 // SPDX-License-Identifier: GPL-2.0-only
3  *      intel-mid_wdt: generic Intel MID SCU watchdog driver
6  *      - Merrifield only
17 #include <linux/platform_data/intel-mid_wdt.h>
20 #include <asm/intel-mid.h>
29 /* SCU watchdog messages */
43 wdt_command(struct mid_wdt *mid, int sub, const void *in, size_t inlen, size_t size)  in wdt_command()  argument
45 	struct intel_scu_ipc_dev *scu = mid->scu;  in wdt_command()
47 	return intel_scu_ipc_dev_command_with_size(scu, IPC_WATCHDOG, sub, in,  in wdt_command()
55 	int timeout = wd->timeout;  in wdt_start()
59 	} ipc_wd_start = { timeout - MID_WDT_PRETIMEOUT, timeout };  in wdt_start()
72 		dev_crit(mid->dev, "error starting watchdog: %d\n", ret);  in wdt_start()
84 		dev_crit(mid->dev, "Error executing keepalive: %d\n", ret);  in wdt_ping()
96 		dev_crit(mid->dev, "Error stopping watchdog: %d\n", ret);  in wdt_stop()
123 	struct device *dev = &pdev->dev;  in mid_wdt_probe()
125 	struct intel_mid_wdt_pdata *pdata = dev->platform_data;  in mid_wdt_probe()
131 		return -EINVAL;  in mid_wdt_probe()
134 	if (pdata->probe) {  in mid_wdt_probe()
135 		ret = pdata->probe(pdev);  in mid_wdt_probe()
142 		return -ENOMEM;  in mid_wdt_probe()
144 	mid->dev = dev;  in mid_wdt_probe()
145 	wdt_dev = &mid->wd;  in mid_wdt_probe()
147 	wdt_dev->info = &mid_wdt_info;  in mid_wdt_probe()
148 	wdt_dev->ops = &mid_wdt_ops;  in mid_wdt_probe()
149 	wdt_dev->min_timeout = MID_WDT_TIMEOUT_MIN;  in mid_wdt_probe()
150 	wdt_dev->max_timeout = MID_WDT_TIMEOUT_MAX;  in mid_wdt_probe()
151 	wdt_dev->timeout = MID_WDT_DEFAULT_TIMEOUT;  in mid_wdt_probe()
152 	wdt_dev->parent = dev;  in mid_wdt_probe()
157 	mid->scu = devm_intel_scu_ipc_dev_get(dev);  in mid_wdt_probe()
158 	if (!mid->scu)  in mid_wdt_probe()
159 		return -EPROBE_DEFER;  in mid_wdt_probe()
161 	ret = devm_request_irq(dev, pdata->irq, mid_wdt_irq,  in mid_wdt_probe()
165 		dev_err(dev, "error requesting warning irq %d\n", pdata->irq);  in mid_wdt_probe()
170 	 * The firmware followed by U-Boot leaves the watchdog running  in mid_wdt_probe()
183 	set_bit(WDOG_HW_RUNNING, &wdt_dev->status);  in mid_wdt_probe()