watchdog: intel-mid_wdt: Convert to use new SCU IPC API

This converts the Intel MID watchdog driver over the new SCU IPC API
where the SCU IPC instance is passed to the functions.

Signed-off-by: Mika Westerberg <[e-mail]>
Acked-by: Guenter Roeck <[e-mail]>
Reviewed-by: Andy Shevchenko <[e-mail]>
Signed-off-by: Lee Jones <[e-mail]>

drivers/watchdog/intel-mid_wdt.c

···
 	SCU_WATCHDOG_KEEPALIVE,
 };
 
-static inline int wdt_command(int sub, u32 *in, int inlen)
+struct mid_wdt {
+	struct watchdog_device wd;
+	struct device *dev;
+	struct intel_scu_ipc_dev *scu;
+};
+
+static inline int
+wdt_command(struct mid_wdt *mid, int sub, const void *in, size_t inlen, size_t size)
 {
-	return intel_scu_ipc_command(IPC_WATCHDOG, sub, in, inlen, NULL, 0);
+	struct intel_scu_ipc_dev *scu = mid->scu;
+
+	return intel_scu_ipc_dev_command_with_size(scu, IPC_WATCHDOG, sub, in,
+						   inlen, size, NULL, 0);
 }
 
 static int wdt_start(struct watchdog_device *wd)
 {
-	struct device *dev = watchdog_get_drvdata(wd);
+	struct mid_wdt *mid = watchdog_get_drvdata(wd);
 	int ret, in_size;
 	int timeout = wd->timeout;
 	struct ipc_wd_start {
···
 	} ipc_wd_start = { timeout - MID_WDT_PRETIMEOUT, timeout };
 
 	/*
-	 * SCU expects the input size for watchdog IPC to
-	 * be based on 4 bytes
+	 * SCU expects the input size for watchdog IPC to be 2 which is the
+	 * size of the structure in dwords. SCU IPC normally takes bytes
+	 * but this is a special case where we specify size to be different
+	 * than inlen.
 	 */
 	in_size = DIV_ROUND_UP(sizeof(ipc_wd_start), 4);
 
-	ret = wdt_command(SCU_WATCHDOG_START, (u32 *)&ipc_wd_start, in_size);
+	ret = wdt_command(mid, SCU_WATCHDOG_START, &ipc_wd_start,
+			  sizeof(ipc_wd_start), in_size);
 	if (ret)
-		dev_crit(dev, "error starting watchdog: %d\n", ret);
+		dev_crit(mid->dev, "error starting watchdog: %d\n", ret);
 
 	return ret;
 }
 
 static int wdt_ping(struct watchdog_device *wd)
 {
-	struct device *dev = watchdog_get_drvdata(wd);
+	struct mid_wdt *mid = watchdog_get_drvdata(wd);
 	int ret;
 
-	ret = wdt_command(SCU_WATCHDOG_KEEPALIVE, NULL, 0);
+	ret = wdt_command(mid, SCU_WATCHDOG_KEEPALIVE, NULL, 0, 0);
 	if (ret)
-		dev_crit(dev, "Error executing keepalive: %d\n", ret);
+		dev_crit(mid->dev, "Error executing keepalive: %d\n", ret);
 
 	return ret;
 }
 
 static int wdt_stop(struct watchdog_device *wd)
 {
-	struct device *dev = watchdog_get_drvdata(wd);
+	struct mid_wdt *mid = watchdog_get_drvdata(wd);
 	int ret;
 
-	ret = wdt_command(SCU_WATCHDOG_STOP, NULL, 0);
+	ret = wdt_command(mid, SCU_WATCHDOG_STOP, NULL, 0, 0);
 	if (ret)
-		dev_crit(dev, "Error stopping watchdog: %d\n", ret);
+		dev_crit(mid->dev, "Error stopping watchdog: %d\n", ret);
 
 	return ret;
 }
···
 	struct device *dev = &pdev->dev;
 	struct watchdog_device *wdt_dev;
 	struct intel_mid_wdt_pdata *pdata = dev->platform_data;
+	struct mid_wdt *mid;
 	int ret;
 
 	if (!pdata) {
···
 			return ret;
 	}
 
-	wdt_dev = devm_kzalloc(dev, sizeof(*wdt_dev), GFP_KERNEL);
-	if (!wdt_dev)
+	mid = devm_kzalloc(dev, sizeof(*mid), GFP_KERNEL);
+	if (!mid)
 		return -ENOMEM;
+
+	mid->dev = dev;
+	wdt_dev = &mid->wd;
 
 	wdt_dev->info = &mid_wdt_info;
 	wdt_dev->ops = &mid_wdt_ops;
···
 	wdt_dev->parent = dev;
 
 	watchdog_set_nowayout(wdt_dev, WATCHDOG_NOWAYOUT);
-	watchdog_set_drvdata(wdt_dev, dev);
+	watchdog_set_drvdata(wdt_dev, mid);
 
 	ret = devm_request_irq(dev, pdata->irq, mid_wdt_irq,
 			       IRQF_SHARED | IRQF_NO_SUSPEND, "watchdog",
···
 		dev_err(dev, "error requesting warning irq %d\n", pdata->irq);
 		return ret;
 	}
+
+	mid->scu = devm_intel_scu_ipc_dev_get(dev);
+	if (!mid->scu)
+		return -EPROBE_DEFER;
 
 	/*
 	 * The firmware followed by U-Boot leaves the watchdog running