watchdog: ftwdt010: return a previously deleted driver now ported to DM
The ftwdt010 watchdog driver was deleted by
commit 11232139e399 ("nds32: Remove the architecture")
Return it to the codebase in a DM compatible form. Enable it in
sandbox_defconfig to test compilability.
Another platform using ftwdt010 will be submitted later.
Signed-off-by: Sergei Antonov <saproj@gmail.com>
Reviewed-by: Stefan Roese <sr@denx.de>
diff --git a/drivers/watchdog/ftwdt010_wdt.c b/drivers/watchdog/ftwdt010_wdt.c
new file mode 100644
index 0000000..a6b33b1
--- /dev/null
+++ b/drivers/watchdog/ftwdt010_wdt.c
@@ -0,0 +1,132 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Watchdog driver for the FTWDT010 Watch Dog Driver
+ *
+ * (c) Copyright 2004 Faraday Technology Corp. (www.faraday-tech.com)
+ * Based on sa1100_wdt.c by Oleg Drokin <green@crimea.edu>
+ * Based on SoftDog driver by Alan Cox <alan@redhat.com>
+ *
+ * Copyright (C) 2011 Andes Technology Corporation
+ * Macpaul Lin, Andes Technology Corporation <macpaul@andestech.com>
+ *
+ * 27/11/2004 Initial release, Faraday.
+ * 12/01/2011 Port to u-boot, Macpaul Lin.
+ * 22/08/2022 Port to DM
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <wdt.h>
+#include <log.h>
+#include <asm/io.h>
+#include <faraday/ftwdt010_wdt.h>
+
+struct ftwdt010_wdt_priv {
+ struct ftwdt010_wdt __iomem *regs;
+};
+
+/*
+ * Set the watchdog time interval.
+ * Counter is 32 bit.
+ */
+static int ftwdt010_wdt_start(struct udevice *dev, u64 timeout_ms, ulong flags)
+{
+ struct ftwdt010_wdt_priv *priv = dev_get_priv(dev);
+ struct ftwdt010_wdt *wd = priv->regs;
+ unsigned int reg;
+
+ debug("Activating WDT %llu ms\n", timeout_ms);
+
+ /* Check if disabled */
+ if (readl(&wd->wdcr) & ~FTWDT010_WDCR_ENABLE) {
+ printf("sorry, watchdog is disabled\n");
+ return -1;
+ }
+
+ /*
+ * In a 66MHz system,
+ * if you set WDLOAD as 0x03EF1480 (66000000)
+ * the reset timer is 1 second.
+ */
+ reg = FTWDT010_WDLOAD(timeout_ms * FTWDT010_TIMEOUT_FACTOR);
+
+ writel(reg, &wd->wdload);
+
+ return 0;
+}
+
+static int ftwdt010_wdt_reset(struct udevice *dev)
+{
+ struct ftwdt010_wdt_priv *priv = dev_get_priv(dev);
+ struct ftwdt010_wdt *wd = priv->regs;
+
+ /* clear control register */
+ writel(0, &wd->wdcr);
+
+ /* Write Magic number */
+ writel(FTWDT010_WDRESTART_MAGIC, &wd->wdrestart);
+
+ /* Enable WDT */
+ writel((FTWDT010_WDCR_RST | FTWDT010_WDCR_ENABLE), &wd->wdcr);
+
+ return 0;
+}
+
+static int ftwdt010_wdt_stop(struct udevice *dev)
+{
+ struct ftwdt010_wdt_priv *priv = dev_get_priv(dev);
+ struct ftwdt010_wdt *wd = priv->regs;
+
+ debug("Deactivating WDT..\n");
+
+ /*
+ * It was defined with CONFIG_WATCHDOG_NOWAYOUT in Linux
+ *
+ * Shut off the timer.
+ * Lock it in if it's a module and we defined ...NOWAYOUT
+ */
+ writel(0, &wd->wdcr);
+ return 0;
+}
+
+static int ftwdt010_wdt_expire_now(struct udevice *dev, ulong flags)
+{
+ struct ftwdt010_wdt_priv *priv = dev_get_priv(dev);
+ struct ftwdt010_wdt *wd = priv->regs;
+
+ debug("Expiring WDT..\n");
+ writel(FTWDT010_WDLOAD(0), &wd->wdload);
+ return ftwdt010_wdt_reset(dev);
+}
+
+static int ftwdt010_wdt_probe(struct udevice *dev)
+{
+ struct ftwdt010_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 ftwdt010_wdt_ops = {
+ .start = ftwdt010_wdt_start,
+ .reset = ftwdt010_wdt_reset,
+ .stop = ftwdt010_wdt_stop,
+ .expire_now = ftwdt010_wdt_expire_now,
+};
+
+static const struct udevice_id ftwdt010_wdt_ids[] = {
+ { .compatible = "faraday,ftwdt010" },
+ {}
+};
+
+U_BOOT_DRIVER(ftwdt010_wdt) = {
+ .name = "ftwdt010_wdt",
+ .id = UCLASS_WDT,
+ .of_match = ftwdt010_wdt_ids,
+ .ops = &ftwdt010_wdt_ops,
+ .probe = ftwdt010_wdt_probe,
+ .priv_auto = sizeof(struct ftwdt010_wdt_priv),
+};