GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

source/bootloader/u-boot-2020.01/drivers/watchdog/tangier_wdt.c

@@ -0,0 +1,92 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (c) 2017 Intel Corporation
+ */
+#include <common.h>
+#include <dm.h>
+#include <wdt.h>
+#include <div64.h>
+#include <asm/scu.h>
+
+/* Hardware timeout in seconds */
+#define WDT_PRETIMEOUT		15
+#define WDT_TIMEOUT_MIN		(1 + WDT_PRETIMEOUT)
+#define WDT_TIMEOUT_MAX		170
+
+/*
+ * Note, firmware chooses 90 seconds as a default timeout for watchdog on
+ * Intel Tangier SoC. It means that without handling it in the running code
+ * the reboot will happen.
+ */
+
+enum {
+	SCU_WATCHDOG_START			= 0,
+	SCU_WATCHDOG_STOP			= 1,
+	SCU_WATCHDOG_KEEPALIVE			= 2,
+	SCU_WATCHDOG_SET_ACTION_ON_TIMEOUT	= 3,
+};
+
+static int tangier_wdt_reset(struct udevice *dev)
+{
+	scu_ipc_simple_command(IPCMSG_WATCHDOG_TIMER, SCU_WATCHDOG_KEEPALIVE);
+	return 0;
+}
+
+static int tangier_wdt_stop(struct udevice *dev)
+{
+	return scu_ipc_simple_command(IPCMSG_WATCHDOG_TIMER, SCU_WATCHDOG_STOP);
+}
+
+static int tangier_wdt_start(struct udevice *dev, u64 timeout_ms, ulong flags)
+{
+	u32 timeout_sec;
+	int in_size;
+	struct ipc_wd_start {
+		u32 pretimeout;
+		u32 timeout;
+	} ipc_wd_start;
+
+	/* Calculate timeout in seconds and restrict to min and max value */
+	do_div(timeout_ms, 1000);
+	timeout_sec = clamp_t(u32, timeout_ms, WDT_TIMEOUT_MIN, WDT_TIMEOUT_MAX);
+
+	/* Update values in the IPC request */
+	ipc_wd_start.pretimeout = timeout_sec - WDT_PRETIMEOUT;
+	ipc_wd_start.timeout = timeout_sec;
+
+	/*
+	 * SCU expects the input size for watchdog IPC
+	 * to be based on 4 bytes
+	 */
+	in_size = DIV_ROUND_UP(sizeof(ipc_wd_start), 4);
+
+	scu_ipc_command(IPCMSG_WATCHDOG_TIMER, SCU_WATCHDOG_START,
+			(u32 *)&ipc_wd_start, in_size, NULL, 0);
+
+	return 0;
+}
+
+static const struct wdt_ops tangier_wdt_ops = {
+	.reset = tangier_wdt_reset,
+	.start = tangier_wdt_start,
+	.stop = tangier_wdt_stop,
+};
+
+static const struct udevice_id tangier_wdt_ids[] = {
+	{ .compatible = "intel,tangier-wdt" },
+	{ /* sentinel */ }
+};
+
+static int tangier_wdt_probe(struct udevice *dev)
+{
+	debug("%s: Probing wdt%u\n", __func__, dev->seq);
+	return 0;
+}
+
+U_BOOT_DRIVER(wdt_tangier) = {
+	.name = "wdt_tangier",
+	.id = UCLASS_WDT,
+	.of_match = tangier_wdt_ids,
+	.ops = &tangier_wdt_ops,
+	.probe = tangier_wdt_probe,
+};