1 files changed, 110 insertions, 0 deletions
diff --git a/roms/u-boot/drivers/watchdog/ast2600_wdt.c b/roms/u-boot/drivers/watchdog/ast2600_wdt.c
new file mode 100644
index 000000000..bc9842089
--- /dev/null
+++ b/roms/u-boot/drivers/watchdog/ast2600_wdt.c
@@ -0,0 +1,110 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (c) 2020 Aspeed Technology, Inc
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <log.h>
+#include <wdt.h>
+#include <asm/io.h>
+#include <asm/arch/wdt_ast2600.h>
+#include <linux/err.h>
+
+struct ast2600_wdt_priv {
+	struct ast2600_wdt *regs;
+};
+
+static int ast2600_wdt_start(struct udevice *dev, u64 timeout_ms, ulong flags)
+{
+	struct ast2600_wdt_priv *priv = dev_get_priv(dev);
+	struct ast2600_wdt *wdt = priv->regs;
+
+	/* WDT counts in the 1MHz frequency, namely 1us */
+	writel((u32)(timeout_ms * 1000), &wdt->counter_reload_val);
+	writel(WDT_COUNTER_RESTART_VAL, &wdt->counter_restart);
+	writel(WDT_CTRL_EN | WDT_CTRL_RESET, &wdt->ctrl);
+
+	return 0;
+}
+
+static int ast2600_wdt_stop(struct udevice *dev)
+{
+	struct ast2600_wdt_priv *priv = dev_get_priv(dev);
+	struct ast2600_wdt *wdt = priv->regs;
+
+	clrbits_le32(&wdt->ctrl, WDT_CTRL_EN);
+
+	writel(WDT_RESET_MASK1_DEFAULT, &wdt->reset_mask1);
+	writel(WDT_RESET_MASK2_DEFAULT, &wdt->reset_mask2);
+
+	return 0;
+}
+
+static int ast2600_wdt_reset(struct udevice *dev)
+{
+	struct ast2600_wdt_priv *priv = dev_get_priv(dev);
+	struct ast2600_wdt *wdt = priv->regs;
+
+	writel(WDT_COUNTER_RESTART_VAL, &wdt->counter_restart);
+
+	return 0;
+}
+
+static int ast2600_wdt_expire_now(struct udevice *dev, ulong flags)
+{
+	int ret;
+	struct ast2600_wdt_priv *priv = dev_get_priv(dev);
+	struct ast2600_wdt *wdt = priv->regs;
+
+	ret = ast2600_wdt_start(dev, 1, flags);
+	if (ret)
+		return ret;
+
+	while (readl(&wdt->ctrl) & WDT_CTRL_EN)
+		;
+
+	return ast2600_wdt_stop(dev);
+}
+
+static int ast2600_wdt_of_to_plat(struct udevice *dev)
+{
+	struct ast2600_wdt_priv *priv = dev_get_priv(dev);
+
+	priv->regs = dev_read_addr_ptr(dev);
+	if (!priv->regs)
+		return -EINVAL;
+
+	return 0;
+}
+
+static const struct wdt_ops ast2600_wdt_ops = {
+	.start = ast2600_wdt_start,
+	.reset = ast2600_wdt_reset,
+	.stop = ast2600_wdt_stop,
+	.expire_now = ast2600_wdt_expire_now,
+};
+
+static const struct udevice_id ast2600_wdt_ids[] = {
+	{ .compatible = "aspeed,ast2600-wdt" },
+	{ }
+};
+
+static int ast2600_wdt_probe(struct udevice *dev)
+{
+	debug("%s() wdt%u\n", __func__, dev_seq(dev));
+	ast2600_wdt_stop(dev);
+
+	return 0;
+}
+
+U_BOOT_DRIVER(ast2600_wdt) = {
+	.name = "ast2600_wdt",
+	.id = UCLASS_WDT,
+	.of_match = ast2600_wdt_ids,
+	.probe = ast2600_wdt_probe,
+	.priv_auto = sizeof(struct ast2600_wdt_priv),
+	.of_to_plat = ast2600_wdt_of_to_plat,
+	.ops = &ast2600_wdt_ops,
+};